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CN-122003784-A - Battery monomer, battery and power consumption device

CN122003784ACN 122003784 ACN122003784 ACN 122003784ACN-122003784-A

Abstract

The power utilization device includes a battery (100), and the battery (100) includes a battery cell (110). The battery unit (110) comprises a shell (10) and an electrode assembly (12), the shell (10) is provided with a first shell wall (11) and a liquid injection hole (10 a) formed in the first shell wall (11), the first shell wall (11) comprises a main body part (111) and an installation part (112), an accommodating cavity (112 a) is formed by sinking the inner wall of the installation part (112), at least one installation part (112) is provided with the liquid injection hole (10 a), the liquid injection hole (10 a) is communicated with the outer part of the shell (10) and the accommodating cavity (112 a), the electrode assembly (12) is arranged in the shell (10), a flow guide channel (10 b) is formed between the main body part (111) and the electrode assembly (12), and the flow guide channel (10 b) is communicated with the accommodating cavity (112 a). The battery cell (110) can guide at least part of the electrolyte accumulated in the accommodating chamber (112 a) to other regions of the inner space of the case (10) by providing an additional flow guide channel (10 b), improving the efficiency of electrolyte injection.

Inventors

  • ZHOU WENLIN
  • CHENG QI
  • Meng Wanqiu
  • 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
20240702

Claims (20)

  1. A battery cell, comprising: The shell is provided with a first shell wall and a liquid injection hole arranged on the first shell wall, the first shell wall comprises a main body part and a mounting part, the inner wall of the mounting part is sunken to form a containing cavity, at least one mounting part is provided with the liquid injection hole, and the liquid injection hole is communicated with the outer part of the shell and the containing cavity; An electrode assembly disposed within the housing; And a flow guide channel is arranged between the main body part and the electrode assembly, and the flow guide channel is communicated with the accommodating cavity.
  2. The battery cell according to claim 1, wherein a surface of the main body portion facing the side of the electrode assembly is provided with a first groove that is open to the side of the electrode assembly, the first groove forming at least part of the flow guide channel.
  3. The battery cell of claim 1, wherein the battery cell further comprises an insulator between the first housing wall and the electrode assembly, at least a portion of the flow channel being between the insulator and the first housing wall; And/or at least part of the flow guide channel is positioned between the electrode assembly and the insulator.
  4. The battery cell of claim 3, wherein a portion of the insulator is spaced from the electrode assembly to form at least a portion of the flow channel.
  5. The battery cell according to claim 4, wherein a side of the insulating member facing the electrode assembly is provided with a second groove, the second groove being open to a side of the electrode assembly, the second groove forming at least part of the flow guide channel.
  6. The battery cell of any one of claims 3 to 5, wherein a portion of the insulator is spaced from the body portion along a first direction to form at least a portion of the flow-directing channel.
  7. The battery cell according to claim 6, wherein at least one of a surface of the main body portion facing the side of the insulating member and a surface of the insulating member facing the side of the main body portion is provided with a third groove, the third groove being open along one side of the first direction, the third groove forming at least part of the flow guide passage.
  8. The battery cell according to claim 7, wherein a portion of the main body portion protrudes in the first direction toward a side facing away from the electrode assembly to form a first protruding portion, and the third groove is formed at the other side.
  9. The battery cell according to claim 7 or 8, wherein the insulating member is provided with a second protruding portion protruding toward one side away from the electrode assembly in the first direction and forming an accommodation space at the other side, at least part of the second protruding portion is provided in the accommodation chamber, the third protruding portion is provided with a first through-hole penetrating in the first direction, the first through-hole communicates with the liquid injection hole, and the accommodation space communicates with the third groove.
  10. The battery cell according to claim 9, wherein a side of the second protruding portion perpendicular to the first direction is provided with a second through hole therethrough, the second through hole communicates with the third groove and the accommodation space, and the first through hole and the liquid injection hole both extend in the first direction.
  11. The battery cell according to claim 10, wherein a transfer channel is formed between the inner wall of the accommodating cavity and the second protruding portion at intervals along a second direction, the first direction is perpendicular to the second direction, and the transfer channel communicates the second through hole with the third groove.
  12. The battery cell according to claim 10 or 11, wherein a portion of the insulating member located outside the second protruding portion is provided with a third through hole penetrating in the first direction, the third through hole, the third groove, and the second through hole communicating with each other.
  13. The battery cell of claim 12, wherein a ratio of a projected area of the third through hole to a projected area of the first case wall in a projection perpendicular to the first direction ranges from 10% to 50%.
  14. The battery cell according to claim 12 or 13, wherein the number of the third through holes is plural, and at least a part of the third through holes are spaced apart in a direction away from the accommodation chamber.
  15. The battery cell according to any one of claims 12 to 14, wherein an inscribed circle diameter of the contour of the third through hole is not more than 15mm in a projection plane perpendicular to the first direction.
  16. The battery cell according to any one of claims 7 to 15, wherein the third groove is located in the main body portion, and a ratio of a dimension of the third groove in the first direction to a dimension of the main body portion in the first direction is not less than 20% and not more than 70%.
  17. The battery cell according to any one of claims 7 to 15, wherein the third groove is located in the main body portion, and a ratio of a dimension of the third groove in the first direction to a dimension of the main body portion in the first direction ranges from one third to 50%.
  18. The battery cell according to any one of claims 6 to 17, wherein a dimension of a portion of the flow guide channel between the main body portion and the insulating member in the first direction ranges from 0.5mm to 5mm.
  19. The battery cell according to any one of claims 1 to 18, wherein the mounting portion protrudes from a surface of the main body portion in a direction away from the accommodation chamber.
  20. The battery cell according to any one of claims 1 to 19, wherein the number of the mounting portions is plural, each of the mounting portions being provided with the liquid injection hole.

Description

Battery monomer, battery and power consumption device Technical Field The embodiment of the disclosure relates to the technical field of batteries, in particular to a battery monomer, a battery and an electric device. Background In the battery cell, an electrode assembly is arranged, and the electrode assembly needs to be soaked with electrolyte to realize electrochemical reaction with the electrolyte so as to realize the charging and discharging functions of the battery cell. Therefore, in the production and manufacture of the battery cell, it is necessary to inject an electrolyte into the battery cell to infiltrate the electrode assembly. In the related art, a liquid injection hole is generally provided in a case of a battery cell, and an electrolyte is injected into the battery cell through the liquid injection hole. However, in order to reduce the space occupied by the battery cell, the structure of the battery cell is more and more compact, and the electrolyte is easily blocked by the electrode assembly and the permeation rate of the electrolyte in the electrode assembly after passing through the electrolyte injection hole, so that the injection flow rate of the electrolyte is limited, and the injection efficiency is adversely affected. Disclosure of Invention In view of the foregoing, it is desirable to provide a battery cell, a battery, and an electric device capable of improving the electrolyte injection efficiency. In order to achieve the above object, the technical solution of the embodiments of the present disclosure is implemented as follows: The embodiment of the disclosure provides a battery cell, comprising: The shell is provided with a first shell wall and a liquid injection hole arranged on the first shell wall, the first shell wall comprises a main body part and a mounting part, the inner wall of the mounting part is sunken to form a containing cavity, at least one mounting part is provided with the liquid injection hole, and the liquid injection hole is communicated with the outer part of the shell and the containing cavity; An electrode assembly disposed within the housing; And a flow guide channel is arranged between the main body part and the electrode assembly, and the flow guide channel is communicated with the accommodating cavity. According to the battery monomer in the embodiment of the disclosure, the extra diversion channel is arranged, so that electrolyte accumulated in the accommodating cavity can be at least partially guided to other areas of the inner space of the shell, the permeation speed of the electrolyte in the electrode assembly is improved, the flowing range of the electrolyte in the shell is enlarged, the probability that the electrolyte is excessively accumulated in the accommodating cavity to prevent the subsequent electrolyte from entering the shell, the electrolyte overflows the shell and the like is reduced, the electrolyte injection efficiency is improved, the flow rate of the injected electrolyte is improved, and the production and manufacturing efficiency of the battery monomer is improved. In some embodiments, a surface of the body portion facing a side of the electrode assembly is provided with a first groove that is open to a side of the electrode assembly, the first groove forming at least part of the flow guide channel. Therefore, the structure of the diversion channel can be simplified, so that the electrolyte can directly flow to other areas of the inner space of the shell under the guidance of the main body part, and the structure of the battery cell is simplified. In some embodiments, the battery unit further includes an insulating member, the insulating member is located between the first casing wall and the electrode assembly, and at least part of the flow guiding channel is located between the insulating member and the first casing wall, so that the structure forming the flow guiding channel is simplified, the probability of changing the cross section of the flow guiding channel due to relative movement between the insulating member and the electrode assembly is reduced, and the flow guiding channel is kept unchanged in cross section size under different working conditions to meet the flow requirement of electrolyte; And/or, at least part of the flow guide channel is positioned between the electrode assembly and the insulating part, so that the contact area between the insulating part and the first shell wall is increased, the insulating property and the mounting stability of the insulating part are improved, the structure forming the flow guide channel is simplified, the probability of the change of the cross section of the flow guide channel caused by the relative movement between the insulating part and the first shell wall is reduced, and the flow guide channel is kept unchanged in cross section size under different working conditions to meet the flow requirement of electrolyte. In some embodiments, a portion of the insulator is spaced from t