Search

CN-122003761-A - Battery cell, battery device and electricity utilization device

CN122003761ACN 122003761 ACN122003761 ACN 122003761ACN-122003761-A

Abstract

The application provides a battery monomer, a battery device and an electricity utilization device, and belongs to the technical field of batteries. The battery cell includes a case, an electrode assembly, an electrode terminal, a fixing member, and a first insulating member. The electrode assembly is accommodated in the case. The electrode terminal is disposed on a wall portion of the case and is electrically connected to the electrode assembly. The fixing member is disposed on a peripheral side of the electrode terminal, and the fixing member includes a base portion connected to the wall portion and a stopper portion connected to the base portion and extending in a direction approaching the electrode terminal, the stopper portion being configured to restrict movement of the electrode terminal in a direction away from the electrode assembly in a thickness direction of the wall portion. At least a portion of the first insulating member is disposed between the electrode terminal and the stopper portion. The thickness of the limiting part is smaller than that of the base part. The space for accommodating the first insulating member between the limiting part and the electrode terminal can be enlarged while the connection strength requirement of the base part and the wall part of the fixing member is satisfied, so that the creepage distance between the limiting part and the electrode terminal can be increased.

Inventors

  • ZHOU WENLIN
  • CHENG QI
  • KE HAIBO
  • ZHENG YULIAN
  • WANG PENG

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20240904

Claims (20)

  1. A battery cell comprising: a housing having a wall portion; an electrode assembly accommodated in the case; An electrode terminal provided to the wall portion, the electrode terminal being electrically connected to the electrode assembly; A fixing member provided on a peripheral side of the electrode terminal, the fixing member including a base portion connected to the wall portion and a stopper portion connected to the base portion and extending in a direction approaching the electrode terminal, the stopper portion configured to restrict movement of the electrode terminal in a direction away from the electrode assembly in a thickness direction of the wall portion, and A first insulating member at least partially disposed between the electrode terminal and the stopper portion; wherein, the thickness of spacing portion is less than the thickness of basal portion.
  2. The battery cell according to claim 1, wherein a portion of the electrode terminal is located between the stopper portion and the wall portion in a thickness direction of the wall portion.
  3. The battery cell according to claim 2, wherein a surface of the stopper portion facing the wall portion is farther from the wall portion than a surface of the base portion facing the wall portion in a thickness direction of the wall portion.
  4. The battery cell according to claim 3, wherein a surface of the stopper portion facing away from the wall portion is further away from the wall portion than a surface of the base portion facing away from the wall portion in a thickness direction of the wall portion; The fixing piece further comprises a connecting part, and the connecting part is connected with the base part and the limiting part.
  5. The battery cell according to claim 4, wherein the stopper portion and the base portion are disposed at intervals in a thickness direction of the wall portion.
  6. The battery cell according to claim 4 or 5, wherein the base portion extends from the connecting portion in a direction away from the electrode terminal in a direction perpendicular to a thickness direction of the wall portion, and the stopper portion extends from the connecting portion in a direction close to the electrode terminal.
  7. The battery cell according to any one of claims 4 to 6, wherein an orthographic projection of the connecting portion and an orthographic projection of the electrode terminal do not overlap in the same plane perpendicular to a thickness direction of the wall portion.
  8. The battery cell according to any one of claims 4 to 7, wherein the connecting portion includes a curved section connected to the base portion in a direction perpendicular to a thickness direction of the wall portion, and a flat section connected to the curved section and extending from the curved section in a direction approaching the electrode terminal; Wherein the surface of the straight section facing away from the wall portion is further away from the wall portion in the thickness direction of the wall portion than the surface of the base section facing away from the wall portion, and the stopper portion is connected to an end of the straight section facing the electrode terminal in a direction perpendicular to the thickness direction of the wall portion.
  9. The battery cell according to claim 8, wherein a surface of the stopper facing the wall portion is further away from the wall portion than a surface of the straight section facing the wall portion in a thickness direction of the wall portion to form a thinned groove in a side of the stopper facing the wall portion, the portion of the first insulating member being accommodated in the thinned groove.
  10. The battery cell according to claim 8 or 9, wherein a surface of the stopper portion facing away from the wall portion is closer to the wall portion than a surface of the straight section facing away from the wall portion in a thickness direction of the wall portion, and a portion of the first insulating member is located on a side of the stopper portion facing away from the wall portion.
  11. A battery cell according to claim 3, wherein a surface of the stopper portion facing away from the wall portion is flush with a surface of the base portion facing away from the wall portion in a thickness direction of the wall portion.
  12. The battery cell according to claim 2, wherein a surface of the stopper portion facing away from the wall portion is closer to the wall portion than a surface of the base portion facing away from the wall portion in a thickness direction of the wall portion, and a portion of the first insulating member is located on a side of the stopper portion facing away from the wall portion.
  13. The battery cell according to claim 12, wherein a surface of the stopper portion facing the wall portion is flush with a surface of the base portion facing the wall portion in a thickness direction of the wall portion.
  14. The battery cell according to any one of claims 2-13, wherein the electrode terminal comprises: A body part electrically connected with the electrode assembly; An assembling portion protruding on an outer peripheral surface of the body portion, a portion of the assembling portion being located between the limiting portion and the wall portion in a thickness direction of the wall portion; wherein, along the direction perpendicular to the thickness direction of wall portion, spacing portion is located the basal portion with the body portion, the part of first insulating part is located spacing portion with the outer peripheral face of body portion between.
  15. The battery cell of claim 14, wherein the mounting portion surrounds an outer side of the body portion.
  16. The battery cell according to claim 14 or 15, wherein one of the body portion and the first insulating member is provided with a first limit projection, and the other is provided with a first limit groove in which the first limit projection is received.
  17. The battery unit according to claim 16, wherein the first limiting protrusions are a plurality of, the first limiting protrusions are arranged at intervals along the circumferential direction of the body portion, the first limiting grooves are arranged corresponding to the first limiting protrusions, and each first limiting groove is used for accommodating one first limiting protrusion.
  18. The battery cell according to claim 16 or 17, wherein the first limit projection is provided on the outer peripheral surface of the body portion, and the first insulating member is provided with the first limit groove.
  19. The battery cell according to claim 18, wherein a size of the first limit projection protruding from the outer peripheral surface of the body portion is smaller than a size of the fitting portion protruding from the outer peripheral surface of the body portion.
  20. The battery cell according to claim 18 or 19, wherein the first stopper protrusion is connected to the fitting portion in a thickness direction of the wall portion, and the first stopper protrusion is located at a side of the fitting portion facing the stopper portion.

Description

Battery cell, battery device and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to a battery cell, a battery device 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 demands for power battery products are increasing, and the battery device serving as a core part of the new energy automobile has higher requirements on the usability and the cruising ability. The battery cell of the battery device generally includes a case and an electrode assembly received in the case, and in order to achieve input or output of electric power of the battery cell, an electrode terminal is further mounted on the case in an insulating manner, and the electrode terminal is electrically connected with the electrode assembly to achieve input or output of electric power of the battery cell. However, the existing battery monomer is easy to have risks such as short circuit and the like in the use process, so that the use reliability of the battery monomer is low. Disclosure of Invention The embodiment of the application provides a battery cell, a battery device and an electricity utilization device, which can effectively improve the 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 assembly, an electrode terminal, a fixing piece and a first insulating piece, wherein the shell is provided with a wall part, the electrode assembly is contained in the shell, the electrode terminal is arranged on the wall part and is electrically connected with the electrode assembly, the fixing piece is arranged on the periphery side of the electrode terminal, the fixing piece comprises a base part and a limiting part, the base part is connected with the wall part, the limiting part is connected with the base part and extends in a direction approaching to the electrode terminal, the limiting part is configured to limit the electrode terminal to move in a direction away from the electrode assembly along the thickness direction of the wall part, and at least part of the first insulating piece is arranged between the electrode terminal and the limiting part, wherein the thickness of the limiting part is smaller than that of the base part. In the above technical scheme, be connected with the mounting on the wall of shell, the mounting is provided with basal portion and spacing portion, the basal portion links to each other with the wall, spacing portion connects in the basal portion and extends towards the direction that is close to electrode terminal, and first insulation part's at least part sets up between spacing portion and electrode terminal, make spacing portion and wall can cooperate to carry out the centre gripping assembly to limit electrode terminal and move along the direction of keeping away from the electrode assembly of thickness direction of wall, thereby realize being fixed in the wall with electrode terminal assembly, and can also realize insulating isolation between spacing portion and the electrode terminal through first insulation part, wherein, through the thickness setting of the spacing portion that is used for restricting the power distribution electrode terminal with the mounting is less than the thickness of basal portion that is used for with wall interconnect with the mounting, make can also enlarge the space that is used for holding first insulation part between spacing portion and electrode terminal when satisfying the connection quality and the demand of mounting, thereby can promote the thickness that the first insulation part sets up in the part between spacing portion and electrode terminal, so as to increase the thickness of the portion and electrode terminal to be fixed in order to realize, can effectively reduce the short circuit in order to use the short circuit in the battery in the life in the single-to use the short-circuit in the battery. In some embodiments, a portion of the electrode terminal is located between the stopper portion and the wall portion in a thickness direction of the wall portion. In the above technical scheme, the part of the electrode terminal is arranged between the limiting part and the wall part in the thickness direction of the wall part, so that the part of the limiting part and the part of the wall part are respectively positioned at two sides of the part of the electrode terminal in the thickness direction of the wall part, the effect of clamping and assembling the electrode assembly by matching the limiting part and the wall part can be improved, the effect that the limiting part limits the electrode terminal to move along the thickness direction of the wall part in