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CN-122003767-A - Battery monomer, battery and power consumption device

CN122003767ACN 122003767 ACN122003767 ACN 122003767ACN-122003767-A

Abstract

The application provides a battery monomer, a battery and an electricity utilization device, and belongs to the technical field of batteries. Wherein, the battery cell includes a housing, an electrode terminal, and an electrode assembly. The housing has a first wall. The electrode terminal is disposed on the first wall. The electrode assembly is accommodated in the case, and the electrode assembly is electrically connected with the electrode terminal. The first wall is provided with the pressure release groove, and the first wall is configured to be able to split along at least partial pressure release groove when the battery monomer is released, along the thickness direction of first wall, the projection of pressure release groove and the projection of electrode terminal do not overlap, and the thickness of electrode terminal is greater than the thickness of first wall. Can promote the structural rigidity of first wall through electrode terminal to promote the anti deformability of first wall, thereby can reduce the area that first wall is provided with the pressure release groove and change the width of cloth in the meeting an emergency in the use, and then can reduce the area that first wall is provided with the pressure release groove and appear low cycle fatigue's phenomenon, be favorable to reducing the risk that the valve was opened in advance appears in the battery monomer.

Inventors

  • QUAN CHAO
  • LI YAO
  • GU MINGGUANG
  • LIU SIKE
  • LIU SHUANGXU

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20240514

Claims (20)

  1. A battery cell comprising: a housing having a first wall; An electrode terminal provided on the first wall, and An electrode assembly accommodated in the case, the electrode assembly being electrically connected with the electrode terminal; the first wall is provided with a pressure relief groove, the first wall is configured to be capable of being split along at least part of the pressure relief groove when the battery cell is depressurized, the projection of the pressure relief groove is not overlapped with the projection of the electrode terminal along the thickness direction of the first wall, and the thickness of the electrode terminal is larger than that of the first wall.
  2. The battery cell according to claim 1, wherein the pressure relief groove and the electrode terminal are arranged in a first direction; The maximum size of the electrode terminal is D 1 along the second direction, the maximum size of the first wall is D 2 , D 1 /D 2 which is more than or equal to 0.4 and less than or equal to 0.9 is met, and the thickness direction of the first wall, the first direction and the second direction are perpendicular to each other.
  3. The battery cell of claim 2, wherein 0.6 +.d 1 /D 2 +.0.9.
  4. The battery cell according to any one of claims 1 to 3, wherein an outer edge of the first wall includes a first edge, the first edge and the pressure relief groove being located on both sides of the electrode terminal in a first direction, respectively, the first direction being perpendicular to a thickness direction of the first wall; Along the first direction, the minimum distance between the pressure relief groove and the electrode terminal is L 1 , and the minimum distance between the pressure relief groove and the first edge is L 2 , so that L 1 /L 2 which is more than or equal to 0.2 and less than or equal to 0.8 is satisfied.
  5. The battery cell of claim 4, wherein 0.2-L 1 /L 2 -0.6.
  6. The battery cell according to any one of claims 1 to 5, wherein the pressure relief groove and the electrode terminal are arranged in a first direction perpendicular to a thickness direction of the first wall; Along the first direction, the minimum distance between the pressure relief groove and the electrode terminal is L 1 , and the thickness of the part of the first wall between the pressure relief groove and the electrode terminal is D, so that the pressure relief groove is 3-30 and the thickness of the part between the pressure relief groove and the electrode terminal is 3- 1 /D is satisfied.
  7. The battery cell of claim 6, wherein 5≤l 1 /d≤25.
  8. The battery cell of claim 6 or 7, wherein 0.8mm +.d +.4 mm.
  9. The battery cell according to any one of claims 1 to 8, wherein the pressure relief groove and the electrode terminal are arranged in a first direction perpendicular to a thickness direction of the first wall; Along the first direction, the minimum distance between the pressure relief groove and the electrode terminal is L 1 , and the minimum distance is more than or equal to 10mm and less than or equal to L 1 and less than or equal to 100mm.
  10. The battery cell of claim 9, wherein 15mm +.l 1 +.50 mm.
  11. The battery cell according to any one of claims 1 to 10, wherein the battery cell includes two electrode terminals, both of which are provided on the first wall, and which are arranged at intervals along a first direction that is perpendicular to a thickness direction of the first wall; and the pressure relief groove is positioned between the two electrode terminals along the first direction.
  12. The battery cell according to claim 11, wherein, in the first direction, the pressure relief groove is equal to a minimum distance between two of the electrode terminals.
  13. The battery cell according to any one of claims 1 to 12, wherein the first wall is provided with mounting holes penetrating the first wall in a thickness direction thereof, the mounting holes being in one-to-one correspondence with the electrode terminals; The electrode terminal comprises a column body, a first limiting part and a second limiting part, the column body penetrates through the mounting hole along the thickness direction of the first wall, the column body is connected with the first limiting part and the second limiting part, the first limiting part and the second limiting part are protruded out of the peripheral surface of the column body, the first limiting part and the second limiting part are located on two sides of the first wall respectively along the thickness direction of the first wall, and at least part of projection of the first limiting part and projection of the second limiting part is overlapped with the first wall.
  14. The battery cell according to any one of claims 1 to 13, wherein a projection of the first wall in a thickness direction of the first wall is rectangular, a dimension of the first wall in a first direction is larger than a dimension of the first wall in a second direction, and the thickness direction of the first wall, the first direction, and the second direction are perpendicular to each other; Wherein, the pressure relief groove with electrode terminal is arranged along first direction.
  15. The battery cell according to claim 14, wherein the housing has a rectangular parallelepiped shape, and further has two second walls disposed opposite to each other along the second direction and connected to both ends of the first wall, respectively; Wherein, in the second direction, a surface of the second wall facing away from the electrode assembly is a surface of the outer surface of the case having the largest area.
  16. The battery cell of any one of claims 1-15, wherein the pressure relief groove is stamped and formed into the first wall.
  17. The battery cell of any one of claims 1-16, wherein the pressure relief groove comprises a plurality of stages of grooves arranged in sequence along a thickness direction of the first wall.
  18. The battery cell of any one of claims 1-17, wherein the pressure relief groove has a minimum residual thickness D 3 , along the thickness direction of the first wall, satisfying 0.05mm ∈d 3 ∈0.3mm.
  19. The battery cell of claim 18, wherein the battery cell further comprises an electrolyte contained within the housing; wherein the electrolyte comprises an electrolyte salt, the electrolyte salt comprises hexafluorophosphate, and the molar concentration of the hexafluorophosphate is less than or equal to 1.1mol/L.
  20. The battery cell of any one of claims 1-19, wherein a bottom of the pressure relief groove forms a first frangible portion, the first wall configured to be capable of breaking along at least a portion of the first frangible portion upon pressure relief of the battery cell; The first wall is further provided with a guide groove, a second weak part is formed at the bottom of the guide groove, at least one preset pressure relief area is defined by the projection of the pressure relief groove and the projection of at least one guide groove along the thickness direction of the first wall, and the second weak part is configured to guide at least part of the preset pressure relief area to overturn so as to open at least part of the preset pressure relief area.

Description

Battery monomer, battery and power consumption device Technical Field The application relates to the technical field of batteries, in particular to a battery cell, a battery and an electric device. Background In recent years, new energy automobiles have been developed dramatically, and in the field of electric automobiles, a power battery plays an important role as a power source of the electric automobile. Along with the great popularization of new energy automobiles, the demand for power battery products is also growing, wherein batteries are used as core components of the new energy automobiles, and have higher requirements in terms of use reliability and service life. In battery technology, in order to guarantee the security of battery monomer, generally set up the relief structure that is used for releasing battery monomer internal pressure on the single shell of battery for when battery monomer internal pressure or temperature reach the threshold value, the relief structure can actuate in order to release the pressure of battery monomer inside. However, the existing pressure release structure of the battery monomer often has the phenomenon of actuating the valve in advance in the use process, so that the use stability of the battery monomer is poor, and the service life and the use reliability of the battery monomer are not improved. Disclosure of Invention The embodiment of the application provides a battery cell, a battery and an electricity utilization device, which can effectively prolong the service life and use reliability of the battery cell. In a first aspect, an embodiment of the application provides a battery cell, which comprises a shell, an electrode terminal and an electrode assembly, wherein the shell is provided with a first wall, the electrode terminal is arranged on the first wall, the electrode assembly is accommodated in the shell and is electrically connected with the electrode terminal, the first wall is provided with a pressure relief groove, the first wall is configured to be capable of being split along at least part of the pressure relief groove when the battery cell is subjected to pressure relief, the projection of the pressure relief groove is not overlapped with the projection of the electrode terminal along the thickness direction of the first wall, and the thickness of the electrode terminal is larger than that of the first wall. In the above technical scheme, be provided with the pressure release groove on the first wall for the first wall can split along at least partial pressure release groove when the battery monomer is released to realize releasing to the free internal pressure of battery, wherein, through also assembling electrode terminal on the first wall, electrode terminal's thickness in the thickness direction of first wall is greater than the thickness of first wall, and electrode terminal's projection in the thickness direction of first wall and the projection of pressure release groove in the thickness direction of first wall do not overlap, make the battery monomer of this kind of structure can set up electrode terminal and battery monomer on the same wall of shell for the structure of pressure release, thereby can promote the structural rigidity of first wall through electrode terminal, with the anti deformability of promoting the first wall, make can alleviate the deformation phenomenon of first wall in the free use of battery, with reduce the strain and the stress relief groove in the free region of first wall, and then can reduce the low tired phenomenon appears in the region that the first wall is provided with the pressure release groove, with the low cycle phenomenon in order to reduce the region that the first wall is provided with the pressure release groove, the battery can be favorable to reduce the life of the single battery and the service life of the single-cycle of the battery. In some embodiments, the pressure relief grooves and the electrode terminals are arranged along a first direction, wherein the maximum dimension of the electrode terminals is D 1, the maximum dimension of the first wall is D 2, 0.4-D 1/D2 -0.9 is satisfied, and the thickness direction of the first wall, the first direction and the second direction are perpendicular. In the above technical scheme, the ratio of the maximum dimension of the electrode terminal in the second direction to the maximum dimension of the first wall in the second direction is 0.4 to 0.9, on one hand, the ratio of the maximum dimension of the electrode terminal in the second direction to the maximum dimension of the first wall in the second direction is set to be greater than or equal to 0.4, so that the space size of the first wall occupied by the electrode terminal in the second direction can be increased, the reinforcement effect of the electrode terminal on the structural rigidity of the first wall can be improved, the deformation resistance of the first wall can be improved, the deformation