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CN-122000582-A - Battery device, charging control method thereof and electric equipment

CN122000582ACN 122000582 ACN122000582 ACN 122000582ACN-122000582-A

Abstract

The application discloses a battery device, a charging control method thereof and electric equipment. The battery device comprises a box body, a plurality of battery cells and a sampling assembly. The battery comprises a shell, an electrode assembly accommodated in the shell, and a positive electrode terminal and a negative electrode terminal arranged on the shell, wherein the electrode assembly comprises a positive electrode plate and a negative electrode plate, the positive electrode terminal is electrically connected with the positive electrode plate, the negative electrode terminal is electrically connected with the negative electrode plate, at least one battery cell positioned at the outermost side along the first direction further comprises a first reference electrode, a first end of the first reference electrode is arranged between the positive electrode plate and the negative electrode plate, and a second end of the first reference electrode extends out of the shell. The sampling component is electrically connected to the second ends of the negative electrode terminal and the first reference electrode and is used for collecting potential information of the negative electrode terminal and the first reference electrode.

Inventors

  • CHEN CHANGYAN
  • ZHU YINGHUA
  • WANG SHIGUAN
  • SHI SONGJUN
  • LAI YOULEI

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (17)

  1. 1. A battery device, characterized by comprising: A case; The battery comprises a case, a plurality of battery cells arranged in the case in an array along a first direction and a second direction, wherein the first direction is perpendicular to the second direction, the battery cells comprise a housing, an electrode assembly accommodated in the housing, and a positive terminal and a negative terminal arranged on the housing, the electrode assembly comprises a positive plate and a negative plate, the positive terminal is electrically connected with the positive plate, the negative terminal is electrically connected with the negative plate, at least one battery cell at the outermost side along the first direction further comprises a first reference electrode, a first end of the first reference electrode is arranged between the positive plate and the negative plate, and a second end of the first reference electrode extends out of the housing, and And the sampling assembly is electrically connected with the negative electrode terminal and the second end of the first reference electrode and is used for collecting potential information of the negative electrode terminal and the first reference electrode.
  2. 2. The battery device according to claim 1, wherein, At least one of the battery cells that is outermost along both the first direction and the second direction is provided with the first reference electrode.
  3. 3. The battery device according to claim 1 or 2, wherein, The battery device comprises a battery management system, wherein the battery management system is electrically connected to the sampling assembly, and is used for calculating a first potential difference between the first reference electrode and the negative electrode terminal and adjusting the charging multiplying power of the battery device according to the first potential difference.
  4. 4. A battery device according to any one of claim 1 to 3, wherein, The electrode assembly comprises a separator, the separator is arranged between the positive electrode plate and the negative electrode plate, and the first end of the first reference electrode is arranged between the separator and the negative electrode plate.
  5. 5. The battery device according to any one of claims 1 to 4, wherein, The positive plate and the negative plate are wound; and/or the first end of the first reference electrode is arranged between the outermost ring of the negative electrode plate, which is close to the shell, and the outermost ring of the positive electrode plate, which is close to the shell.
  6. 6. The battery device according to any one of claims 1 to 4, wherein, The positive electrode plates and the negative electrode plates are multiple, and the positive electrode plates and the negative electrode plates are alternately stacked; the first end of the first reference electrode is arranged between the outermost negative electrode plate and the adjacent outermost positive electrode plate.
  7. 7. The battery device according to any one of claims 1 to 6, wherein, The first end of the first reference electrode extends to the middle part of the positive electrode plate or the negative electrode plate along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.
  8. 8. The battery device according to any one of claims 1 to 7, wherein, The first reference electrode comprises a main body part and an insulating part, wherein the insulating part surrounds the main body part and is fixed with the main body part, the main body part is electrically connected with the sampling assembly, and the end part of the main body part, which is positioned between the positive electrode plate and the negative electrode plate, extends out of the insulating part.
  9. 9. The battery device of claim 8, wherein the battery device comprises a battery cell, The material of the body portion includes lithium titanate.
  10. 10. The battery device according to any one of claims 1 to 9, wherein, The shell comprises a shell body and an end cover, the shell body is provided with an opening, the end cover is covered on the opening, the positive electrode terminal and the negative electrode terminal are both arranged on the end cover, and the second end of the first reference electrode extends out of the end cover and is positioned between the positive electrode terminal and the negative electrode terminal.
  11. 11. The battery device according to any one of claims 1 to 10, wherein, At least one of the battery cells in the middle along the first direction and/or the second direction is provided with a second reference electrode, the second reference electrode is provided with a third end and a fourth end which are opposite, the third end is arranged between the positive electrode plate and the negative electrode plate, the fourth end extends out of the shell and is electrically connected with the sampling assembly, and the sampling assembly is used for collecting potential information of the second reference electrode.
  12. 12. The battery device of claim 11, wherein the battery device comprises a heat exchange plate and a battery management system; the heat exchange plates are arranged between the plurality of battery monomers and the box body, and are internally provided with heat exchange flow passages for circulating heat exchange media; The battery management system is electrically connected to the sampling assembly, and is used for calculating a second potential difference between the second reference electrode and the negative terminal and adjusting the flow rate of the heat exchange medium in the heat exchange flow channel according to the second potential difference.
  13. 13. The battery device according to claim 11 or 12, wherein, The electrode assembly comprises a separator, the separator is arranged between the positive electrode plate and the negative electrode plate, and the third end of the second reference electrode is arranged between the separator and the negative electrode plate.
  14. 14. The battery device according to any one of claims 11 to 13, wherein, The positive plate and the negative plate are wound; The battery cell with the second reference electrode comprises one electrode assembly, a third end of the second reference electrode is arranged between the innermost ring of the positive electrode plate and the innermost ring of the negative electrode plate, or the battery cell with the second reference electrode comprises two electrode units which are arranged in a stacked manner, each electrode unit comprises at least one electrode assembly, and a third end of the second reference electrode is arranged between the negative electrode plate and the positive electrode plate, wherein the negative electrode plate is closest to the outermost ring of one electrode unit.
  15. 15. A charge control method of a battery device according to any one of claims 1 to 14, comprising: Acquiring a first potential of the negative terminal of the battery cell having the first reference electrode and a second potential of the first reference electrode while the battery device is in a charged state; Calculating a first potential difference between the second potential and the first potential, and And adjusting the charging multiplying power of the battery device according to the first potential difference.
  16. 16. The charge control method according to claim 15, wherein, The plurality of battery cells are arranged in an array along a first direction and a second direction in the box body, at least one battery cell positioned in the middle along the first direction and the second direction is provided with a second reference electrode, the second reference electrode is provided with a third end and a fourth end which are opposite, the third end is arranged between the positive plate and the negative plate, and the fourth end extends out of the shell and is electrically connected with the sampling assembly; The battery device comprises a heat exchange plate, wherein the heat exchange plate is arranged between the plurality of battery monomers and the box body, and a heat exchange flow passage is arranged in the heat exchange plate and is used for circulating heat exchange media; The charge control method further includes: acquiring a third potential of the negative terminal of the battery cell having the second reference electrode and a fourth potential of the second reference electrode while the battery device is in a charged state; Calculating a second potential difference between the fourth potential and the third potential, and And adjusting the flow rate of the heat exchange medium in the heat exchange flow channel according to the second potential difference.
  17. 17. A powered device comprising a battery arrangement according to any of claims 1-14 for providing electrical energy.

Description

Battery device, charging control method thereof and electric equipment Technical Field The application belongs to the technical field of batteries, and particularly relates to a battery device, a charging control method thereof and electric equipment. Background Rechargeable batteries refer to batteries that can be used continuously by activating an active material by means of charging after the battery has been discharged. Rechargeable batteries are widely used in electronic devices such as cell phones, notebook computers, drones, and the like. The development of battery technology is taking into consideration various design factors such as energy density, cycle life, assembly efficiency, processing technology, etc., as well as reliability of the battery. Disclosure of Invention The embodiment of the application provides a battery device, a charging control method thereof and electric equipment, which can improve the reliability of the battery device. According to a first aspect of the present application, there is provided a battery device including a case, a plurality of battery cells, and a sampling assembly. The battery comprises a shell, an electrode assembly accommodated in the shell, and a positive electrode terminal and a negative electrode terminal arranged on the shell, wherein the electrode assembly comprises a positive electrode plate and a negative electrode plate, the positive electrode terminal is electrically connected with the positive electrode plate, the negative electrode terminal is electrically connected with the negative electrode plate, at least one battery cell positioned at the outermost side along the first direction further comprises a first reference electrode, a first end of the first reference electrode is arranged between the positive electrode plate and the negative electrode plate, and a second end of the first reference electrode extends out of the shell. The sampling component is electrically connected to the second ends of the negative electrode terminal and the first reference electrode and is used for collecting potential information of the negative electrode terminal and the first reference electrode. Because the precipitation of lithium ions needs a certain potential condition, namely the potential of the negative electrode is lower than that of the electrode of the lithium ions, whether the lithium precipitation phenomenon occurs in the battery cell at the outermost side can be judged according to the potential difference between the first reference electrode and the negative electrode sheet, the prediction and the evaluation of whether the running state of the whole battery device is normal or not are facilitated, the risks of abnormal running and performance deterioration of the battery device are reduced, and the reliability of the battery device is improved. In some embodiments, at least one cell that is outermost in both the first direction and the second direction is provided with a first reference electrode. Therefore, whether other battery monomers are used for lithium precipitation or not can be predicted more accurately, namely when the battery monomers do not have the phenomenon of lithium precipitation, the possibility that the other battery monomers are used for lithium precipitation is smaller, the risks of abnormal operation and performance deterioration of each battery monomer are reduced, and the reliability of the battery device is further improved. In some embodiments, the battery device includes a battery management system electrically connected to the sampling assembly, the battery management system configured to calculate a first potential difference between the first reference electrode and the negative terminal, and adjust a charging rate of the battery device according to the first potential difference, so that a battery cell of the battery device always operates under good working conditions, which is beneficial to improving a cycle life and a capacity retention rate of the battery device. In some embodiments, the electrode assembly includes a separator disposed between the positive and negative electrode sheets, and the first end of the first reference electrode is disposed between the separator and the negative electrode sheet. Therefore, the lithium precipitation phenomenon of the battery monomer can be detected more timely, the charging rate of the battery device can be adjusted conveniently in time, and the probability of performance deterioration of the battery monomer is reduced. In some embodiments, the positive electrode sheet and the negative electrode sheet are wound, a first end of the first reference electrode is arranged between an innermost ring of the positive electrode sheet and an innermost ring of the negative electrode sheet, and/or a first end of the first reference electrode is arranged between an outermost ring of the negative electrode sheet near the housing and an outermost ring of the positive electrode sheet near