Search

CN-122025974-A - Battery monomer, battery package and vehicle

CN122025974ACN 122025974 ACN122025974 ACN 122025974ACN-122025974-A

Abstract

The embodiment of the invention relates to the technical field of vehicles and discloses a battery unit, a battery pack and a vehicle, wherein the battery unit comprises a battery shell provided with a containing cavity and a battery core contained in the containing cavity, the battery shell is provided with a telescopic part, so that the battery shell can be deformed in a telescopic way along a first direction along with the change of the internal pressure of the containing cavity, and the ratio of the total expansion amount of the battery core in the first direction to the maximum telescopic displacement of the battery shell in the first direction is greater than or equal to 0.9 and less than or equal to 20. By applying the technical scheme of the invention, the problem that the telescopic part of the battery shell is easy to over-design or under-design in the prior art can be solved.

Inventors

  • DENG XIAOYING
  • ZHANG TAO
  • XIAO SHENGLONG
  • YU CHENG

Assignees

  • 深蓝汽车科技有限公司

Dates

Publication Date
20260512
Application Date
20260224

Claims (10)

  1. 1. The battery cell is characterized by comprising a battery shell provided with a containing cavity and an electric core (212) contained in the containing cavity, wherein a telescopic part is arranged on the battery shell, so that the battery shell can be deformed in a telescopic way along a first direction along with the change of the internal pressure of the containing cavity, and the ratio of the total expansion amount of the electric core (212) in the first direction to the maximum telescopic displacement of the battery shell in the first direction is greater than or equal to 0.9 and less than or equal to 20.
  2. 2. The battery cell of claim 1, wherein a ratio of a total amount of expansion of the cell (212) in the first direction to a maximum telescopic displacement of the battery housing in the first direction is greater than or equal to 1 and less than or equal to 1.1.
  3. 3. The battery cell of claim 1, wherein a ratio of a dimension of the cell (212) in the first direction to a dimension of the battery housing in the first direction excluding the region of the telescoping portion is greater than or equal to 0.97.
  4. 4. The battery cell as defined in claim 1, wherein the battery case is provided with the expansion and contraction parts at both ends in the first direction.
  5. 5. The battery cell according to claim 1, wherein an internal pressure of the battery cell (21) is greater than or equal to 0.5MPa when an elongation of the battery case in the first direction is half of the maximum telescopic displacement.
  6. 6. The battery cell of claim 1, wherein a thickness direction of the cell (212) is coincident with the first direction.
  7. 7. The battery cell according to claim 1, wherein the battery case includes a case body (211) having an opening at one end and a top cover (213) connected to the opening, the case body (211) and the top cover (213) enclose the accommodating chamber, and the expansion and contraction part includes a first sub expansion and contraction part (2116) provided on the case body (211) and a second sub expansion and contraction part (2131) provided on the top cover (213).
  8. 8. The battery cell of claim 1, wherein the bellows comprises one or more of a corrugated bellows, a laminated bellows, an elastic membrane.
  9. 9. A battery pack, characterized by comprising a battery cell (21) according to any one of claims 1-8.
  10. 10. A vehicle characterized by comprising a battery cell (21) according to any one of claims 1-8.

Description

Battery monomer, battery package and vehicle Technical Field The invention relates to the technical field of batteries, in particular to a battery cell, a battery pack and a vehicle. Background During the charging and use of the battery cell, an increase in the thickness of the battery cell may occur, resulting in an increase in the internal expansion force of the battery cell. The increased expansion force can cause the material of the battery cell to generate internal stress, so that the aging of the battery cell is accelerated, and the service life and reliability of the battery cell are affected. In order to alleviate this problem, there is a prior art in which a telescopic part is provided on a battery case, and the telescopic part can be deformed to expand and contract along with the expansion of a battery cell, so as to improve the life and reliability of a battery cell. However, if the expansion and contraction portion is improperly designed, an over-design or under-design problem is likely to occur, and the over-designed expansion and contraction portion causes an increase in the volume of the battery cell, and the under-designed expansion and contraction portion is difficult to sufficiently release the expansion force. Disclosure of Invention In view of the above-mentioned shortcomings of the prior art, an object of the present application is to provide a battery cell, a battery pack and a vehicle, which are aimed at solving the problem that the expansion and contraction part of the battery case is easy to over-design or under-design in the prior art. In a first aspect, an embodiment of the present application provides a battery unit, including a battery housing provided with a receiving cavity and a battery cell received in the receiving cavity, where the battery housing is provided with a telescopic portion, so that the battery housing can be deformed in a telescopic manner along a first direction according to a pressure change in the receiving cavity, and a ratio of a total amount of expansion of the battery cell in the first direction to a maximum telescopic displacement of the battery housing in the first direction is greater than or equal to 0.9 and less than or equal to 20. By adopting the technical scheme, the telescopic part is arranged on the battery shell, so that the battery shell can respond to the change of the internal gas pressure of the battery cell to generate deformation, the actual volume of the accommodating cavity is changed, the internal pressure of the battery cell is released, the pressure stability of the expansion process of the battery cell is kept, and the service life and the reliability of the battery cell are improved. Through the expansion total amount to the electric core and the biggest scalable displacement of battery case match, can effectively prevent that the battery case telescopic part from appearing over design or under design, can prevent because over design leads to the volume increase of battery monomer or because under design leads to the inflation power release not enough. In some embodiments, the ratio of the total amount of expansion of the battery cells in the first direction to the maximum telescopic displacement of the battery housing in the first direction is greater than or equal to 1 and less than or equal to 1.1. The ratio is greater than or equal to 1 and less than or equal to 1.1, and the cycle performance of the battery cell and the matching effect of the telescopic part are optimal in the preferred range, so that the expansion force in the cycle process of the battery cell can be obviously released, the cycle number of the battery cell is prolonged, and the cycle performance of the battery cell is improved. In some embodiments, the ratio of the dimension of the cell in the first direction to the dimension of the cell housing in the first direction excluding the region of the telescoping portion is greater than or equal to 0.97. By adopting the technical scheme, the energy density of the battery monomer can be better ensured by matching the size of the battery core with the size of the rigid area of the battery shell. In some embodiments, the battery case is provided with the telescoping portion at both ends in the first direction. By adopting the technical scheme, the telescopic parts are arranged on the two sides of the battery cell, so that the stress of the battery cell is more uniform, and the cycle performance of the battery cell is better. In some embodiments, the internal pressure of the battery cell is greater than or equal to 0.5MPa when the elongation of the battery housing in the first direction is half of the maximum telescopic displacement. By adopting the technical scheme, the elastic deformation characteristic of the telescopic part can meet the rigidity requirement of the battery shell, and also can meet the requirement that the telescopic part generates proper deformation in response to the change of the gas pressure in t