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CN-224204194-U - Battery cell, battery device and electricity utilization device

CN224204194UCN 224204194 UCN224204194 UCN 224204194UCN-224204194-U

Abstract

The embodiment of the application provides a battery monomer, a battery device and an electricity utilization device. The battery unit comprises a shell, an electrode assembly and an insulating part, wherein the shell comprises a first wall, a second wall and a side wall, the first wall and the second wall are oppositely arranged along a first direction, one end of the side wall is connected with the first wall, the other end of the side wall is connected with the second wall, a medium injection opening is formed in the first wall, the electrode assembly is provided with a first side face facing the side wall, a gap is formed between the first side face and the inner surface of the shell, the insulating part is arranged between the first wall and the electrode assembly, a first diversion groove and a second diversion groove which are mutually communicated are formed in one side of the insulating part facing the first wall, the first diversion groove is used for guiding a medium injected by the medium injection opening to the second diversion groove, an outlet is formed in the insulating part, and the orthographic projection of the outlet falls into the orthographic projection of the gap on the same projection plane perpendicular to the first direction. The technical scheme provided by the application is used for improving the reliability of the battery monomer.

Inventors

  • HUANG HUIYI
  • CHEN HONGWEI
  • YANG JIANXIONG
  • GUO ZHIJUN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260505
Application Date
20250325

Claims (15)

  1. 1. A battery cell, comprising: The shell comprises a first wall, a second wall and a side wall, wherein the first wall and the second wall are oppositely arranged along a first direction, the side wall is arranged around the second wall in a surrounding mode, one end of the side wall is connected with the first wall, the other end of the side wall is connected with the second wall, and a medium injection opening is formed in the first wall; An electrode assembly disposed within the case, the electrode assembly having a first side surface facing the sidewall, a gap being formed between the first side surface and an inner surface of the case; An insulating member disposed between the first wall and the electrode assembly; the insulation piece is provided with a first diversion trench and a second diversion trench which are mutually communicated, wherein one side of the insulation piece facing the first wall is provided with the first diversion trench and the second diversion trench which are mutually communicated, the first diversion trench is used for guiding a medium injected by the medium injection opening to the second diversion trench, the second diversion trench is arranged at the edge of the insulation piece and circumferentially surrounds the insulation piece, the insulation piece is provided with an outflow opening, the outflow opening is communicated with the inside and the outside of the second diversion trench, and the orthographic projection of the outflow opening falls into the orthographic projection of the gap on the same projection plane perpendicular to the first direction.
  2. 2. The battery cell of claim 1, wherein the insulator has a second side facing the sidewall, the outlet being disposed in the second side; on the same projection plane perpendicular to the first direction, the orthographic projection of the second side falls within the orthographic projection of the gap.
  3. 3. The battery cell according to claim 1, wherein the number of the outflow openings is plural, and the plural outflow openings are distributed at intervals along the extending direction of the second diversion trench.
  4. 4. The battery cell of claim 3, wherein the second flow guide groove comprises two first sub-flow passages and two second sub-flow passages, the two first sub-flow passages are positioned on two opposite sides of the insulating piece in the second direction, the first sub-flow passages are communicated with the first flow guide groove, the two second sub-flow passages are positioned on two opposite sides of the insulating piece in the third direction, two ends of the second sub-flow passages are respectively communicated with the two first sub-flow passages, and the plurality of outflow openings are arranged in the first sub-flow passages and/or the second sub-flow passages, and the first direction, the second direction and the third direction are perpendicular to each other.
  5. 5. The battery cell as recited in claim 4, wherein the second sub-channel comprises two flow-dividing channels, wherein opposite ends of the two flow-dividing channels are respectively communicated with the two first sub-channels, and opposite ends of the two flow-dividing channels are not communicated.
  6. 6. The battery cell of claim 4, wherein the channel wall of the second channel comprises a bottom wall, an inner side wall, and an outer side wall, the outer side wall and the inner side wall being disposed opposite each other, the outer side wall being disposed closer to the side wall of the housing than the inner side wall, the outflow opening being disposed in the outer side wall and/or the bottom wall and penetrating the insulator.
  7. 7. The battery cell of claim 6, wherein the outlet comprises a first outlet, the first outlet is a notch structure disposed at least through the outer sidewall along the first direction, and the first outlet is disposed in the first sub-channel and/or the second sub-channel.
  8. 8. The battery cell of claim 6, wherein the outlet comprises a second outlet, the second outlet being a through hole structure disposed through the bottom wall, the second outlet being disposed at least in the first sub-flow channel.
  9. 9. The battery cell according to claim 1, wherein the insulating member comprises a body and a flange provided around an edge of the body, the second flow guide groove is formed between the flange and the body, and a height of the body protruding from the bottom surface of the second flow guide groove is larger than a height of the flange protruding from the bottom surface of the second flow guide groove in a thickness direction of the first wall.
  10. 10. The battery cell of claim 1, wherein the first channel has a gradually increasing channel width along a flow direction of the medium within the first channel.
  11. 11. The battery cell of claim 1, wherein a projection of the medium injection port onto the insulating member is located within the first channel in the first direction.
  12. 12. The battery cell of claim 11, wherein the first channel has a first channel bottom surface disposed opposite the inner surface of the first wall, the first channel bottom surface is provided with a first relief channel, the first relief channel is recessed in a direction away from the inner surface of the first wall, and the first relief channel is disposed opposite the medium injection port in the first direction.
  13. 13. The battery cell of claim 12, wherein the first relief groove has a second groove bottom surface disposed opposite the inner surface of the first wall, the second groove bottom surface being provided with a first through hole extending through the insulator in the first direction.
  14. 14. A battery device comprising a battery cell according to any one of claims 1-13.
  15. 15. An electrical device comprising a battery cell according to any one of claims 1-13, said electrical device being adapted to provide electrical energy.

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 Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles. In addition to improving the energy density of the battery, the reliability of the battery is also a non-negligible problem in the development of battery technology. Therefore, how to improve the reliability of the battery is a technical problem to be solved in the battery technology. Disclosure of utility model The application provides a battery cell, a battery device and an electricity utilization device, which are used for improving the reliability of the battery cell. The application is realized by the following technical scheme: In a first aspect, an embodiment of the application provides a battery unit, the battery unit comprises a shell, an electrode assembly and an insulating part, the shell comprises a first wall, a second wall and a side wall, the first wall and the second wall are oppositely arranged along a first direction, the side wall is arranged around the second wall in a surrounding mode, one end of the side wall is connected with the first wall, the other end of the side wall is connected with the second wall, a medium injection opening is formed in the first wall, the electrode assembly is arranged in the shell, the electrode assembly is provided with a first side face facing the side wall, a gap is formed between the first side face and the inner surface of the shell, the insulating part is arranged between the first wall and the electrode assembly, a first guide groove and a second guide groove which are communicated with each other are arranged on one side of the insulating part facing the first wall, the first guide groove is used for guiding a medium injected by the medium injection opening to the second guide groove, the second guide groove is arranged on the edge of the insulating part and surrounds the periphery of the insulating part, the insulating part is provided with a flow outlet, the flow outlet is communicated with the inside and the outside of the second guide groove, and a positive projection of the flow outlet falls into the gap on the same projection perpendicular to the first direction. According to the battery cell provided by the embodiment of the application, through the arrangement of the first diversion trench and the second diversion trench on the insulating piece, the first diversion trench and the second diversion trench are mutually communicated, so that the medium (such as electrolyte) injected from the medium injection opening flows to the edge of the insulating piece, the smooth flow of the medium is ensured, and then the medium enters the interior of the battery cell through the outflow opening on the insulating piece. On the same projection plane perpendicular to the first direction, the orthographic projection of the outflow port falls into the orthographic projection of the gap, and the medium flowing out of the outflow port can flow into one side of the bottom of the electrode assembly in the shell along the inner surface of the shell through the gap between the electrode assembly and the shell, so that on one hand, the resistance of the medium injection in the battery cell is smaller due to the existence of the gap between the electrode assembly and the inner surface of the shell, and the liquid injection efficiency of the medium can be improved. On the other hand, after the medium flows into one side of the bottom of the electrode assembly in the shell, the medium starts to infiltrate from bottom to top from the bottom of the electrode assembly, and the medium can infiltrate the electrode assembly more uniformly in the battery cells, so that the consistency of the infiltration effect of the battery cells is improved, and the infiltration effect of the medium on the electrode assembly is improved. In addition, the medium adopts a bottom-up infiltration mode, and in the process of filling and standing the battery monomer, the risk that residual gas in the battery monomer cannot escape due to the occurrence of a liquid seal phenomenon of the medium so as to cause lithium precipitation in the middle of the battery monomer is reduced, and the reliability of the battery monomer is improved. According to some embodiments of the application, the insulator has a second side facing the sidewall, the outflow opening is disposed on the second side, and an orthographic projection of the second side falls within an orthographic p