Article(id=1206288137194631828, tenantId=1146029695717560320, journalId=1146123222451335185, issueId=1206288129569387042, articleNumber=1671-1807(2025)11-0091-09, orderNo=null, doi=null, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1729008000000, receivedDateStr=2024-10-16, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1765531103656, onlineDateStr=2025-12-12, pubDate=1749484800000, pubDateStr=2025-06-10, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1765531103656, onlineIssueDateStr=2025-12-12, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1765531103656, creator=13701087609, updateTime=1765531103656, updator=13701087609, issue=Issue{id=1206288129569387042, tenantId=1146029695717560320, journalId=1146123222451335185, year='2025', volume='25', issue='11', pageStart='1', pageEnd='389', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1765531101838, creator=13701087609, updateTime=1765531429788, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1206289505120744207, tenantId=1146029695717560320, journalId=1146123222451335185, issueId=1206288129569387042, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1206289505120744208, tenantId=1146029695717560320, journalId=1146123222451335185, issueId=1206288129569387042, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=91, endPage=99, ext={EN=ArticleExt(id=1206288139275006725, articleId=1206288137194631828, tenantId=1146029695717560320, journalId=1146123222451335185, language=EN, title=Joint Prediction of SOH and RUL Based on SMoE Model and Battery Integration Data, columnId=1151876674645226399, journalTitle=Science Technology and Industry, columnName=Technology Innovation, runingTitle=null, highlight=null, articleAbstract=
The state of health(SOH) and remaining useful life(RUL) of a battery are key indicators for measuring battery performance degradation and remaining useful time. Predicting battery SOH and RUL is of great importance in practical applications. Usually, battery operation data is used to train machine learning algorithms, such as neural networks or deep learning, to capture the changing patterns of battery SOH and RUL and make predictions. Traditional machine learning models often use a single model to adapt to the entire dataset, which is inadequate when dealing with complex and highly heterogeneous data. Building a model for each prediction target incurs high training and maintenance costs. Sparse mixture of experts (SMoE) was used to construct a joint prediction model for battery SOH and RUL, and battery fusion data was used to simultaneously predict battery SOH and RUL. The results of testing on NASA’s public dataset show that the proposed joint prediction model can effectively predict battery SOH and RUL, with a mean square error of 0.069 for SOH prediction and 2.042 for RUL prediction. Tested on the EIS public dataset, the mean square error of the SOH prediction value of the joint prediction model was 0.118, and the mean square error of the RUL prediction value was 3.072, indicating a significant improvement in accuracy. The models and methods proposed in the text have certain reference and application value.
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电池的健康状况(SOH)和电池的剩余使用寿命(RUL)是衡量电池性能衰减和剩余使用时间的关键指标。预测电池SOH和RUL在实际应用中具有重要意义。通常会借助电池运行数据来训练机器学习算法,如神经网络或深度学习,以此来捕捉电池SOH和RUL的变化规律并进行预测。传统的机器学习模型往往采用单个模型来适配整个数据集,这在面对复杂且具有高度异质性的数据时显得力不从心,每一个预测目标构建一个模型,模型训练和维护成本较高。使用稀疏混合专家模型(SMoE),构建电池SOH和RUL的联合预测模型,使用电池融合数据,同时预测电池SOH和RUL。在NASA(美国国家航空和宇宙航行局)公开数据集合上测试效果。结果表明,提出的联合预测模型能够很好地预测电池SOH和RUL,SOH预测值的均方误差为0.069,RUL预测值的均方误差为2.042。在电化学阻抗谱(EIS)公开数据集合上测试效果,联合预测模型的SOH预测值的均方误差为0.118,RUL预测值的均方误差为3.072,准确性均有大幅度提升。
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常伟(1976—),男,湖南长沙人,硕士,高级工程师,研究方向为电池工业;
胡志超(1984—),男,湖北黄梅人,硕士,高级工程师,研究方向为电池热失控、EIS、SOH估计;
潘多昭(1991—),男,壮族,新疆阿勒泰人,硕士,高级工程师,研究方向为储能与能源工程、AI算法、智慧能源;
师继文(1990—),男,陕西宝鸡人,硕士,中级工程师,研究方向为新能源材料。
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常伟(1976—),男,湖南长沙人,硕士,高级工程师,研究方向为电池工业;
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常伟(1976—),男,湖南长沙人,硕士,高级工程师,研究方向为电池工业;
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胡志超(1984—),男,湖北黄梅人,硕士,高级工程师,研究方向为电池热失控、EIS、SOH估计;
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胡志超(1984—),男,湖北黄梅人,硕士,高级工程师,研究方向为电池热失控、EIS、SOH估计;
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潘多昭(1991—),男,壮族,新疆阿勒泰人,硕士,高级工程师,研究方向为储能与能源工程、AI算法、智慧能源;
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潘多昭(1991—),男,壮族,新疆阿勒泰人,硕士,高级工程师,研究方向为储能与能源工程、AI算法、智慧能源;
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师继文(1990—),男,陕西宝鸡人,硕士,中级工程师,研究方向为新能源材料。
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师继文(1990—),男,陕西宝鸡人,硕士,中级工程师,研究方向为新能源材料。
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13(4): 672-679., articleTitle=基于深度学习的锂电池SOC和SOH联合估计研究, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1207055639944184246, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, xref=null, ext=[AuthorCompanyExt(id=1207055639948378551, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, companyId=1207055639944184246, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=Nantong Le Chuang New Energy Co., Ltd., Nantong 226000, Jiangsu, China), AuthorCompanyExt(id=1207055639956767160, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, companyId=1207055639944184246, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=南通乐创新能源有限公司, 江苏 南通 226000)])], figs=[ArticleFig(id=1207055644033630845, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=EN, label=null, caption=null, figureFileSmall=ls/ESMmA1Oj84YX/YjfmRg==, figureFileBig=tRd8Qacs3luhaULnCuMEZg==, tableContent=null), ArticleFig(id=1207055644113322632, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=CN, label=图1, caption=
基于SMoE模型联合预测SOH和RUL整体流程, figureFileSmall=ls/ESMmA1Oj84YX/YjfmRg==, figureFileBig=tRd8Qacs3luhaULnCuMEZg==, tableContent=null), ArticleFig(id=1207055644276900501, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=EN, label=null, caption=null, figureFileSmall=ZL4R3J/KcUhObWou2U6ikw==, figureFileBig=kjk+QLRGcU9uyU3YTLzVJQ==, tableContent=null), ArticleFig(id=1207055644453061278, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=CN, label=图2, caption=
基于SMoE模型联合预测SOH和RUL的模型结构 input_1,…,input2_m表示输入数据;expert1、expert2和expert3表示专家子模型;CNN表示卷积神经网络;BiLSTM表示双向长短期记忆网络;gating_network表示门控网络模型;mlp表示多层感知机模型;output1、output2和output3表示专家子模型的输出值;top_K表示激活前K个专家子模型;weighted_sum表示加权求和;full_connecting表示全连接层;linear表示线性回归
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卷积计算示意图 Input表示输入数据;Filter表示滤波器;Result表示输出结果
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LSTM模型结构 Ct表示记忆单元,通过门控机制选择性保留或遗忘信息;ft表示遗忘门输出,控制旧信息的保留程度;it表示输入门输出,控制新信息的添加程度; 表示候选细胞状态,存储当前时刻的临时记忆;ht表示LSTM的输出向量,用于传递到下一时间步或作为最终输出;Ot表示输出门输出,控制隐藏状态的生成;σ表示Sigmoid函数,输出值在 (0,1)之间;tanh表示双曲正切函数,输出值在(-1,1) 之间;⊕表示求和;⊗表示乘积
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BiLSTM模型结构 Input Layer表示输入层;x0、x1、…、xn表示输入数据;Forward Layer表示前向层, 表示前向LSTM的第i步输出向量;Backward Layer表示后向层; 表示后向LSTM的第n-i步输出向量;Activation Layer表示激活层;Output Layer表示输出层;y0、y1、…、yn表示输出数据
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门控网络模型结构 x_1、…、x_n表示输入数据;relu表示激活函数;node_1、…、node_32表示隐藏节点;softmax表示激活函数;output_1、output_2和output_3表示输出值
, figureFileSmall=i68j0fDWWIprhw8YsDdf8g==, figureFileBig=e0rxMwllkhQ2WszI4ojTZQ==, tableContent=null), ArticleFig(id=1207055646223057679, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=EN, label=null, caption=null, figureFileSmall=0yELZzfAqSrv28o8sOkS6w==, figureFileBig=r+zICnimsPJKxIHawmM90w==, tableContent=null), ArticleFig(id=1207055647477154588, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=CN, label=图7, caption=
基于SMoE模型和电池融合数据的电池SOH预测结果样例, figureFileSmall=0yELZzfAqSrv28o8sOkS6w==, figureFileBig=r+zICnimsPJKxIHawmM90w==, tableContent=null), ArticleFig(id=1207055647607178021, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=EN, label=null, caption=null, figureFileSmall=QcndKXXLfPproJgN2q/xZg==, figureFileBig=zgScvRgO9F1KM8MdFg3Jng==, tableContent=null), ArticleFig(id=1207055647837864764, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=CN, label=图8, caption=
基于SMoE模型和电池融合数据的电池RUL预测结果, figureFileSmall=QcndKXXLfPproJgN2q/xZg==, figureFileBig=zgScvRgO9F1KM8MdFg3Jng==, tableContent=null), ArticleFig(id=1207055647955305288, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=EN, label=null, caption=null, figureFileSmall=c63r2dh2VKPKnEd4YapWPQ==, figureFileBig=7FHu0JR8Q31qyuDQo+Zh8w==, tableContent=null), ArticleFig(id=1207055648144048982, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=CN, label=图9, caption=
基于SMoE和EIS融合数据的电池SOH预测结果, figureFileSmall=c63r2dh2VKPKnEd4YapWPQ==, figureFileBig=7FHu0JR8Q31qyuDQo+Zh8w==, tableContent=null), ArticleFig(id=1207055648269878119, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=EN, label=null, caption=null, figureFileSmall=mc4nPcElXve2brYNietpBQ==, figureFileBig=AvJDaB1cVVopy/cD10IwvA==, tableContent=null), ArticleFig(id=1207055648395707254, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=CN, label=图10, caption=
基于SMoE模型和EIS融合数据的电池RUL预测结果, figureFileSmall=mc4nPcElXve2brYNietpBQ==, figureFileBig=AvJDaB1cVVopy/cD10IwvA==, tableContent=null), ArticleFig(id=1207055648534119295, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 特征名称 | 含义 | 单位 |
| Voltage_measured | 测量的电压 | V |
| Current_measured | 测量的电流 | A |
| Temperature_measured | 测量的温度 | ℃ |
| Current_charge | 在负载下测量的电流 | A |
| Voltage_charge | 在负载下测量的电压 | V |
| Capacity | 放电至2.7 V的电池容量 | A·h |
), ArticleFig(id=1207055648685114250, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=CN, label=表1, caption=
电池电流电压温度和SOH数据的特征名称和含义
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| 特征名称 | 含义 | 单位 |
| Voltage_measured | 测量的电压 | V |
| Current_measured | 测量的电流 | A |
| Temperature_measured | 测量的温度 | ℃ |
| Current_charge | 在负载下测量的电流 | A |
| Voltage_charge | 在负载下测量的电压 | V |
| Capacity | 放电至2.7 V的电池容量 | A·h |
), ArticleFig(id=1207055648890635161, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| Voltage_measured | Current_measured | Temperature_measured |
| 4.188 108 651 | 0.000 130 667 | 23.819 520 25 |
| 4.188 195 943 | 0.001 459 081 | 23.828 807 16 |
| … | … | … |
| 3.477 276 739 | -0.001 940 069 | 34.581 659 54 |
| Current_charge | Voltage_charge | Capacity |
| 0.0006 | 0 | 1.855 004 521 |
| 0.0006 | 4.203 | 1.855 004 521 |
| … | … | … |
| 0.0006 | 0 | 1.341 051 441 |
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电池运行数据和SOH样例
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| Voltage_measured | Current_measured | Temperature_measured |
| 4.188 108 651 | 0.000 130 667 | 23.819 520 25 |
| 4.188 195 943 | 0.001 459 081 | 23.828 807 16 |
| … | … | … |
| 3.477 276 739 | -0.001 940 069 | 34.581 659 54 |
| Current_charge | Voltage_charge | Capacity |
| 0.0006 | 0 | 1.855 004 521 |
| 0.0006 | 4.203 | 1.855 004 521 |
| … | … | … |
| 0.0006 | 0 | 1.341 051 441 |
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| 特征名称 | 含义 |
| Sense_current | 传感器支路电流 |
| Battery_current | 电池支路电流 |
| Current_ratio | 传感器支路电流与电池支路电流的比率 |
| Battery_impedance | 根据原始数据计算的电池阻抗 |
| Rectified_impedance | 校准和平滑的电池阻抗 |
| Re | 估计电解液电阻 |
| Rct | 估计充电转移电阻 |
| RUL | 循环次数 |
), ArticleFig(id=1207055649406534602, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=CN, label=表3, caption=
电池电流电阻阻抗和RUL数据的特征名称和含义
, figureFileSmall=null, figureFileBig=null, tableContent=
| 特征名称 | 含义 |
| Sense_current | 传感器支路电流 |
| Battery_current | 电池支路电流 |
| Current_ratio | 传感器支路电流与电池支路电流的比率 |
| Battery_impedance | 根据原始数据计算的电池阻抗 |
| Rectified_impedance | 校准和平滑的电池阻抗 |
| Re | 估计电解液电阻 |
| Rct | 估计充电转移电阻 |
| RUL | 循环次数 |
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| Sense_current_real | Sense_current_imag | Battery_current_real |
| 832.749 572 8 | -27.377 193 45 | 327.527 618 4 |
| 826.062 866 2 | -41.281 600 95 | 331.814 27 |
| …… | …… | …… |
| 803.516 357 4 | 443.114 929 2 | 98.716 178 89 |
| Battery_current_imag | Current_ratio_real | Current_ratio_imag |
| -90.784 202 58 | 2.382 645 118 | 0.576 834 847 |
| -78.227 035 52 | 2.386 236 081 | 0.438 156 484 |
| …… | …… | …… |
| 158.175 430 3 | 4.297 792 306 | -2.397 684 157 |
| Battery_impedance_real | Battery_impedance_imag | Rectified_impedance_real |
| 0.165 409 535 | -0.129 054 344 | 0.095 314 82 |
| 0.165 409 535 | -0.129 054 344 | 0.095 314 82 |
| …… | …… | …… |
| 0.164 978 108 | -0.126 231 668 | 0.091 522 433 |
| Rectified_impedance_imag | Re | Rct | RUL |
| -0.001 691 894 | 0.065 158 152 | 0.095 553 696 | 1 |
| -0.001 691 894 | 0.065 158 152 | 0.095 553 696 | 2 |
| …… | …… | …… | …… |
| -0.002 372 766 | 0.066 068 503 | 0.088 958 851 | 314 |
), ArticleFig(id=1207055649695941600, tenantId=1146029695717560320, journalId=1146123222451335185, articleId=1206288137194631828, language=CN, label=表4, caption=
电池运行数据和RUL样例(部分)
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| Sense_current_real | Sense_current_imag | Battery_current_real |
| 832.749 572 8 | -27.377 193 45 | 327.527 618 4 |
| 826.062 866 2 | -41.281 600 95 | 331.814 27 |
| …… | …… | …… |
| 803.516 357 4 | 443.114 929 2 | 98.716 178 89 |
| Battery_current_imag | Current_ratio_real | Current_ratio_imag |
| -90.784 202 58 | 2.382 645 118 | 0.576 834 847 |
| -78.227 035 52 | 2.386 236 081 | 0.438 156 484 |
| …… | …… | …… |
| 158.175 430 3 | 4.297 792 306 | -2.397 684 157 |
| Battery_impedance_real | Battery_impedance_imag | Rectified_impedance_real |
| 0.165 409 535 | -0.129 054 344 | 0.095 314 82 |
| 0.165 409 535 | -0.129 054 344 | 0.095 314 82 |
| …… | …… | …… |
| 0.164 978 108 | -0.126 231 668 | 0.091 522 433 |
| Rectified_impedance_imag | Re | Rct | RUL |
| -0.001 691 894 | 0.065 158 152 | 0.095 553 696 | 1 |
| -0.001 691 894 | 0.065 158 152 | 0.095 553 696 | 2 |
| …… | …… | …… | …… |
| -0.002 372 766 | 0.066 068 503 | 0.088 958 851 | 314 |
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| 真实值 | 预测值 | 误差 |
| 1.771 2 | 1.806 0 | -0.034 8 |
| 1.415 5 | 1.390 8 | 0.024 7 |
| 1.694 0 | 1.710 3 | -0.016 2 |
| 1.501 2 | 1.579 0 | -0.077 8 |
| 1.695 8 | 1.692 1 | 0.003 7 |
| 1.393 5 | 1.440 6 | -0.047 1 |
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基于SMoE模型和电池融合数据的电池SOH预测结果
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| 真实值 | 预测值 | 误差 |
| 1.771 2 | 1.806 0 | -0.034 8 |
| 1.415 5 | 1.390 8 | 0.024 7 |
| 1.694 0 | 1.710 3 | -0.016 2 |
| 1.501 2 | 1.579 0 | -0.077 8 |
| 1.695 8 | 1.692 1 | 0.003 7 |
| 1.393 5 | 1.440 6 | -0.047 1 |
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| 真实值 | 预测值 | 误差 |
| 195 | 197 | -2 |
| 25 | 24 | 1 |
| 242 | 242 | 0 |
| 49 | 49 | 0 |
| 1 | 1 | 0 |
| 55 | 54 | 1 |
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基于SMoE模型和电池融合数据的电池RUL预测结果
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| 真实值 | 预测值 | 误差 |
| 195 | 197 | -2 |
| 25 | 24 | 1 |
| 242 | 242 | 0 |
| 49 | 49 | 0 |
| 1 | 1 | 0 |
| 55 | 54 | 1 |
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| f1 | f2 | … | f120 | SOH |
| 0.384 7 | 0.391 56 | … | 0.327 95 | 37.202 7 |
| 0.388 86 | 0.393 43 | … | 0.323 00 | 36.223 0 |
| 0.390 38 | 0.396 00 | … | 0.329 55 | 35.589 3 |
| 0.391 94 | 0.396 43 | … | 0.336 73 | 35.108 1 |
| 0.392 25 | 0.397 60 | … | 0.325 62 | 34.767 3 |
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电池EIS和SOH数据集合(部分)
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| f1 | f2 | … | f120 | SOH |
| 0.384 7 | 0.391 56 | … | 0.327 95 | 37.202 7 |
| 0.388 86 | 0.393 43 | … | 0.323 00 | 36.223 0 |
| 0.390 38 | 0.396 00 | … | 0.329 55 | 35.589 3 |
| 0.391 94 | 0.396 43 | … | 0.336 73 | 35.108 1 |
| 0.392 25 | 0.397 60 | … | 0.325 62 | 34.767 3 |
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| f1 | f2 | … | f120 | RUL |
| 0.384 7 | 0.391 56 | … | 0.327 95 | 234 |
| 0.388 86 | 0.393 43 | … | 0.323 00 | 232 |
| 0.390 38 | 0.396 00 | … | 0.329 55 | 230 |
| ︙ | ︙ | ︙ | ︙ | ︙ |
| 0.751 14 | 0.757 14 | … | 0.296 80 | 4 |
| 0.753 21 | 0.758 79 | … | 0.298 27 | 2 |
| 0.752 11 | 0.760 74 | … | 0.291 80 | 0 |
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电池EIS和RUL数据集合(部分)
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| f1 | f2 | … | f120 | RUL |
| 0.384 7 | 0.391 56 | … | 0.327 95 | 234 |
| 0.388 86 | 0.393 43 | … | 0.323 00 | 232 |
| 0.390 38 | 0.396 00 | … | 0.329 55 | 230 |
| ︙ | ︙ | ︙ | ︙ | ︙ |
| 0.751 14 | 0.757 14 | … | 0.296 80 | 4 |
| 0.753 21 | 0.758 79 | … | 0.298 27 | 2 |
| 0.752 11 | 0.760 74 | … | 0.291 80 | 0 |
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| 真实值 | 预测值 | 误差 |
| 26.075 3 | 26.218 5 | -0.143 2 |
| 33.671 3 | 33.551 2 | 0.120 1 |
| 27.654 7 | 27.440 7 | 0.214 1 |
| 29.964 1 | 29.940 3 | 0.023 8 |
| 29.655 3 | 29.599 6 | 0.055 7 |
| 31.018 1 | 31.081 6 | -0.063 5 |
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基于SMoE模型和EIS融合数据的电池SOH预测结果
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| 真实值 | 预测值 | 误差 |
| 26.075 3 | 26.218 5 | -0.143 2 |
| 33.671 3 | 33.551 2 | 0.120 1 |
| 27.654 7 | 27.440 7 | 0.214 1 |
| 29.964 1 | 29.940 3 | 0.023 8 |
| 29.655 3 | 29.599 6 | 0.055 7 |
| 31.018 1 | 31.081 6 | -0.063 5 |
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| 真实值 | 预测值 | 误差 |
| 254 | 258.58 | -4.58 |
| 70 | 67.74 | 2.26 |
| 50 | 47.57 | 2.43 |
| 28 | 31.75 | -3.75 |
| 138 | 138.33 | -0.33 |
| 274 | 276.28 | -2.28 |
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基于SMoE模型和EIS融合数据的电池RUL预测结果
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| 真实值 | 预测值 | 误差 |
| 254 | 258.58 | -4.58 |
| 70 | 67.74 | 2.26 |
| 50 | 47.57 | 2.43 |
| 28 | 31.75 | -3.75 |
| 138 | 138.33 | -0.33 |
| 274 | 276.28 | -2.28 |
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