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CN-224204134-U - Liquid storage assembly, battery cell, battery pack and vehicle

CN224204134UCN 224204134 UCN224204134 UCN 224204134UCN-224204134-U

Abstract

The utility model discloses a liquid storage assembly, a battery cell, a battery pack and a vehicle, wherein the liquid storage assembly is used for the battery cell and comprises an insulating sheet and a protruding part, the insulating sheet is suitable for being arranged between an electrode assembly of the battery cell and a first wall of a shell, a liquid storage cavity is arranged in the insulating sheet, a first through hole and a second through hole are respectively formed on two opposite surfaces of the insulating sheet in the thickness direction, and the first through hole and the second through hole are communicated with the liquid storage cavity. The protruding portion is provided on a surface of the insulating sheet, and the protruding portion is adapted to protrude into the inside of the electrode assembly. The liquid storage component provided by the utility model has the advantages of high electrolyte capacity in the shell and long service life of the battery cell while preventing the electrode component from contacting with the shell.

Inventors

  • FANG ZILI

Assignees

  • 小米汽车科技有限公司

Dates

Publication Date
20260505
Application Date
20250416

Claims (14)

  1. 1. A reservoir assembly for a battery cell, comprising: The insulating sheet is suitable for being arranged between the electrode assembly of the battery unit and the first wall of the shell, a liquid storage cavity is arranged in the insulating sheet, a first through hole and a second through hole are respectively formed in two opposite surfaces of the insulating sheet in the thickness direction, and the first through hole and the second through hole are communicated with the liquid storage cavity; and a protrusion part provided on a surface of the insulating sheet, the protrusion part being adapted to protrude into the electrode assembly.
  2. 2. The liquid storage module according to claim 1, wherein the protruding portion is provided corresponding to the second through hole penetrating the protruding portion in a thickness direction of the insulating sheet.
  3. 3. A reservoir assembly according to claim 2, wherein the cross-sectional outer profile of the boss tapers or decreases stepwise in area away from the insulating sheet; Or the liquid storage component further comprises an injection needle, and the injection needle is connected with the protruding part.
  4. 4. The liquid storage assembly according to claim 1, further comprising a one-way valve disposed in the second through hole, wherein electrolyte in the liquid storage chamber can flow to the protruding portion through the one-way valve.
  5. 5. The fluid reservoir assembly of claim 1, wherein the number of first through holes is a plurality, and the plurality of first through hole arrays are disposed on the surface of the insulating sheet.
  6. 6. The liquid storage assembly according to claim 1, wherein the number of the second through holes is one, and the second through holes are located at a center position of the surface of the insulating sheet; or the number of the second through holes is a plurality, and a plurality of the second through hole arrays are arranged on the surface of the insulating sheet.
  7. 7. A liquid storage assembly according to claim 1, wherein an explosion-proof valve is provided on a bottom wall of the housing, and wherein thinning grooves are provided on an upper surface and a lower surface of a region of the insulating sheet overlapping the explosion-proof valve in a thickness direction of the insulating sheet, and/or wherein the protruding portion is provided on an upper surface of a region of the insulating sheet overlapping the explosion-proof valve in the thickness direction of the insulating sheet.
  8. 8. The liquid storage assembly according to any one of claims 1 to 7, further comprising a side plate adapted to be disposed between a side wall of the housing and the electrode assembly, the side plate being connected to the insulating sheet, a side surface of the side plate facing the side wall of the housing being provided with a liquid storage groove extending in a thickness direction of the insulating sheet, the liquid storage groove being in communication with the liquid storage chamber.
  9. 9. The liquid storage assembly according to claim 8, wherein the liquid storage groove penetrates through the side plate along the thickness direction of the side plate, the lower end of the side plate is connected to one side of the insulating sheet facing the side wall of the shell, and a third through hole which is communicated with the liquid storage cavity and the liquid storage groove is formed in the side surface of the insulating sheet.
  10. 10. The liquid storage assembly according to any one of claims 1-7, further comprising a liquid storage bag connected to the insulating sheet and adapted to wrap around an outer peripheral surface of the electrode assembly, an inner cavity of the liquid storage bag being in communication with the liquid storage cavity.
  11. 11. A battery cell comprising a housing, an electrode assembly disposed within the housing, and a reservoir assembly according to any one of claims 1-10, the insulating sheet disposed between the electrode assembly and the first wall of the housing.
  12. 12. The battery cell according to claim 11, wherein the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator disposed between the positive electrode sheet and the negative electrode sheet, a portion of the separator protruding from a side of the positive electrode sheet and the negative electrode sheet toward the first wall and surrounding a slit, the protruding portion passing through the slit.
  13. 13. A battery pack comprising the battery cell according to claim 11 or 12.
  14. 14. A vehicle comprising the battery pack according to claim 13.

Description

Liquid storage assembly, battery cell, battery pack and vehicle Technical Field The utility model relates to the technical field of batteries, in particular to a liquid storage component, a battery monomer, a battery pack and a vehicle. Background There is the insulating piece usually in the battery monomer, and it can prevent effectively that electrode assembly and battery monomer's casing from taking place to contact, however the insulation board has taken up the part space of casing, has reduced the inside space that is used for holding electrolyte of casing, and this setting probably leads to electrode assembly to soak poorly, and then influences battery monomer's life. Disclosure of utility model The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, the embodiment of the utility model provides a liquid storage assembly, which has the advantages of preventing the electrode assembly from contacting with the shell, and simultaneously, having high electrolyte capacity in the shell and long service life of the battery unit. The embodiment of the utility model also provides a battery cell, a battery pack and a vehicle. The liquid storage assembly is used for a battery unit and comprises an insulating sheet and a protruding portion, wherein the insulating sheet is suitable for being arranged between an electrode assembly of the battery unit and a first wall of a shell, a liquid storage cavity is formed in the insulating sheet, a first through hole and a second through hole are formed in two opposite surfaces of the insulating sheet in the thickness direction, the first through hole and the second through hole are communicated with the liquid storage cavity, the protruding portion is arranged on the surface of the insulating sheet, and the protruding portion is suitable for extending into the electrode assembly. According to the liquid storage assembly provided by the embodiment of the utility model, the liquid storage cavity is arranged in the insulating sheet, the first through hole and the second through hole which are communicated with the liquid storage cavity are respectively arranged on the two surfaces of the insulating sheet, which are opposite in the thickness direction of the insulating sheet, the electrolyte in the shell can be filled in the liquid storage cavity, and the electrolyte capacity in the shell is effectively improved while the insulating sheet is used for spacing the electrode assembly from the first wall of the shell. Meanwhile, through the arrangement of the protruding portion on the upper surface of the insulating sheet, the protruding portion can extend into the electrode assembly to prop open a gap formed by the diaphragm at the bottom of the electrode assembly, so that electrolyte in the liquid storage cavity can be pumped to the positive electrode sheet and the negative electrode sheet inside the electrode assembly through the first through hole or the second through hole when the electrode assembly is charged, discharged and expanded to extrude the insulating sheet, poor infiltration of the electrode assembly is effectively avoided, and the service life of a battery is long. In some embodiments, the protruding portion is disposed corresponding to the second through hole penetrating the protruding portion in a thickness direction of the insulating sheet. In some embodiments, the area of the cross-sectional outer profile of the boss gradually decreases or stepwise decreases in a direction away from the insulating sheet; Or the liquid storage component further comprises an injection needle, and the injection needle is connected with the protruding part. In some embodiments, the liquid storage assembly further includes a one-way valve disposed in the second through hole, and the electrolyte in the liquid storage cavity can flow to the protruding portion through the one-way valve. In some embodiments, the number of the first through holes is plural, and the plurality of the first through hole arrays are provided on the surface of the insulating sheet. In some embodiments, the number of the second through holes is one, and the second through holes are located at a center position of the surface of the insulating sheet; Or the number of the second through holes is a plurality, and a plurality of the second through hole arrays are arranged on the surface of the insulating sheet. In some embodiments, an explosion-proof valve is provided on the bottom wall of the housing, and thinned grooves are provided on the upper surface and the lower surface of the region of the insulating sheet overlapping the explosion-proof valve in the thickness direction of the insulating sheet, and/or the raised portion is provided on the upper surface of the region of the insulating sheet overlapping the explosion-proof valve in the thickness direction of the insulating sheet. In some embodiments, the liquid storage assembly further compris