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CN-224204186-U - Battery cell, battery device and electricity utilization device

CN224204186UCN 224204186 UCN224204186 UCN 224204186UCN-224204186-U

Abstract

Provided are a battery cell, a battery device and an electric device. The battery cell comprises an electrode assembly and a shell, wherein the shell comprises a first wall, a second wall and a side wall, the first wall and the second wall are respectively arranged at two ends of the side wall along the first direction, and the side wall is surrounded on the periphery of the electrode assembly. The first wall comprises a body part and an abutting part, and the body part is provided with a pressure release mechanism. The body portion has a first surface and a second surface disposed opposite to each other, the first surface being a surface of the first wall furthest from the second wall. The abutting part is arranged around the outer edge of the body part and protrudes out of the second surface. The abutting portion has an abutting face closest to the second wall, the abutting face abutting against the electrode assembly. The abutting surface is provided with a diversion trench, and the diversion trench penetrates through the inner peripheral surface of the abutting part and the outer peripheral surface of the abutting part. Along the first direction, the abutting part is provided with a third surface which is opposite to the bottom surface of the diversion trench, and the distance between the bottom surface of the diversion trench and the third surface is smaller than the distance between the first surface and the second surface. The energy density of the battery cell is high.

Inventors

  • WU GUANGJIN
  • XIE CHENGBIN
  • MA RUOYAN
  • GUO ZHIJUN
  • YE GUOQING
  • LIN JUNYI
  • SHI SHENGYUN
  • LI CHUAN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260505
Application Date
20250403

Claims (15)

  1. 1. A battery cell, comprising: An electrode assembly; A case accommodating the electrode assembly, the case including a first wall, a second wall, and a side wall, the first wall and the second wall being disposed at both ends of the side wall in a first direction, respectively, the side wall being surrounded around the electrode assembly; The first wall comprises a body part and an abutting part, the body part is provided with a pressure relief mechanism, the body part is provided with a first surface and a second surface which are oppositely arranged, the first surface is the surface of the first wall which is farthest from the second wall, the abutting part is arranged around the outer edge of the body part and protrudes out of the second surface, the abutting part is provided with an abutting surface which is closest to the second wall, the abutting surface directly or indirectly abuts against the electrode assembly, the abutting surface is provided with a guide groove, the guide groove penetrates through the inner circumferential surface and the outer circumferential surface of the abutting part along the width direction of the abutting part, the abutting part is provided with a third surface which is oppositely arranged with the groove bottom surface of the guide groove along the first direction, and the distance between the groove bottom surface of the guide groove and the third surface is smaller than the distance between the first surface and the second surface.
  2. 2. The battery cell of claim 1, wherein the distance between the bottom surface of the channel and the third surface in the first direction is H 1 and the distance between the first surface and the second surface is H 2 , wherein H 1 /H 2 <1, optionally 0.6H 1 /H 2 < 0.8, is 0.5.
  3. 3. The battery cell of claim 1, wherein a distance between a bottom surface of the channel and the third surface in the first direction is H 1 , such that 0.18mm < H 1 < 1.5mm, optionally 0.3mm < H 1 < 0.5mm.
  4. 4. The battery cell of claim 1, wherein a distance between the first surface and the second surface in the first direction is H 2 , satisfying 0.3mm < H 2 < 2.5mm, optionally 0.45mm < H 2 < 0.8mm.
  5. 5. The battery cell of claim 1, wherein a distance between the abutment surface and a bottom surface of the channel in the first direction is H 3 , such that 0.2mm < H 3 < 1.8mm, optionally 0.4mm < H 3 < 1.6mm, is satisfied.
  6. 6. The battery cell of claim 1, wherein the third surface is closer to the second wall than the second surface in the first direction.
  7. 7. The battery cell of claim 1, wherein a portion of the abutment portion between the groove bottom surface of the flow guide groove and the third surface has a hardness greater than a portion of the body portion between the first surface and the second surface.
  8. 8. The battery cell of any one of claims 1-6, wherein the abutment portion comprises a first portion that is a bottom wall of the flow channel and a first transition portion that connects the first portion and the body portion, the first transition portion having a thickness that is greater than a thickness of the first portion, wherein a surface of the first portion facing away from the second wall is the third surface.
  9. 9. The battery cell of any one of claims 1-6, wherein the first wall further comprises an edge portion disposed around an outer edge of the abutment portion, the abutment surface being closer to the second wall than the edge portion in the first direction, the edge portion being located on a side of the side wall facing away from the second wall and connected to the side wall.
  10. 10. The battery cell of claim 9, wherein the abutment portion comprises a first portion that is a bottom wall of the channel and a second transition portion that connects the first portion and the edge portion, the first portion having a surface facing away from the second wall that is the third surface, the second transition portion having a thickness that is greater than a thickness of the first portion.
  11. 11. The battery cell of any one of claims 1-6, wherein a first flow channel is formed between the side wall and the electrode assembly, the first flow channel being in communication with the flow guide groove.
  12. 12. The battery cell of any one of claims 1-6, wherein the body portion includes a second portion and a third portion, the second portion connecting the third portion and the abutment, the third portion protruding from the second portion in a direction proximate to the second wall along the first direction, the pressure relief mechanism being disposed in the third portion, a surface of the second portion facing away from the second wall being the first surface.
  13. 13. The battery cell of any one of claims 1-6, wherein the housing comprises a shell and an end cap, wherein the shell has an opening at one end, wherein the end cap closes the opening, wherein the end cap is the first wall, and wherein a wall portion of the shell disposed opposite the end cap in a first direction is the second wall.
  14. 14. A battery device comprising a battery cell according to any one of claims 1-12.
  15. 15. An electrical device comprising a battery cell according to any one of claims 1-12 for providing electrical energy to the electrical device.

Description

Battery cell, battery device and electricity utilization device Technical Field The application relates to the field of batteries, in particular to a battery cell, a battery device and an electric device. Background Batteries are widely applied in the field of new energy, such as electric automobiles, new energy automobiles and the like, and the new energy automobiles and the electric automobiles have become new development trends of automobile industry. The development of battery technology is to consider various design factors, such as cycle life, discharge capacity, charge-discharge rate, and other performance parameters. In addition, the energy density of the battery needs to be considered. However, the energy density of current batteries is low. Disclosure of utility model An objective of the embodiments of the present application is to provide a battery cell, a battery device and an electric device, which aim to solve the problem of low energy density of a battery in the related art. In a first aspect, an embodiment of the present application provides a battery unit, where the battery unit includes an electrode assembly and a case, the case accommodates the electrode assembly, the case includes a first wall, a second wall, and a side wall, the first wall and the second wall are respectively disposed at two ends of the side wall along a first direction, the side wall is disposed around the electrode assembly, the first wall includes a body portion and an abutment portion, the body portion is provided with a pressure release mechanism, the body portion has a first surface and a second surface that are disposed opposite to each other, the first surface is a surface of the first wall that is farthest from the second wall, the abutment portion surrounds an outer edge of the body portion and protrudes from the second surface, the abutment portion has an abutment surface that is closest to the second wall, the abutment surface directly or indirectly abuts against the electrode assembly, the abutment surface is provided with a guide groove, the guide groove penetrates through an inner peripheral surface of the abutment portion along a width direction, and has a small distance between the guide groove and a bottom surface of the abutment groove and the third surface, and the abutment surface is disposed between the groove and the bottom surface. In the above technical solution, the first wall includes an abutment portion, and an abutment surface of the abutment portion directly or indirectly abuts against the electrode assembly, where the abutment portion can limit the electrode assembly, so as to reduce the risk of the electrode assembly moving in the first direction in the housing. Because the supporting part is provided with the guiding gutter that runs through the inner peripheral face of supporting part and the outer peripheral face of supporting part, when battery monomer thermal runaway, the emission outside of supporting part can flow to relief mechanism through the guiding gutter to be convenient for so that relief mechanism can actuate fast, shortened from battery monomer thermal runaway to the time when battery monomer begins the pressure release through relief mechanism, reduced the risk of battery monomer explosion, fire, effectively improved the reliability of battery monomer. Through making the guiding gutter the tank bottom with distance between the third surface be less than first surface with distance between the second surface, promptly to leaning on the portion that lies in between the tank bottom of guiding gutter and the third surface of portion and thinned, like this, under the unchangeable circumstances of guiding gutter's degree of depth, can reduce the height that leaning on portion protrusion in the second surface for the size of first wall along the first direction can reduce, thereby can have more spaces to place electrode assembly, is favorable to promoting battery cell's energy density. As an alternative technical scheme of the embodiment of the application, along the first direction, the distance between the bottom surface of the diversion trench and the third surface is H 1, and the distance between the first surface and the second surface is H 2, which satisfies that H 1/H2 <1 is more than or equal to 0.5, optionally H 1/H2 is more than or equal to 0.8. In the above technical scheme, when H 1/H2 <1, along the first direction, the distance between the bottom surface of the groove of the guide groove and the third surface is smaller than the distance between the first surface and the second surface, that is, the portion of the abutting portion between the bottom surface of the groove of the guide groove and the third surface is thinned, so that under the condition that the depth of the guide groove is unchanged, the height of the abutting portion protruding from the second surface can be reduced, the size of the first wall along the first direction can be reduced, and more space