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CN-224217656-U - Battery monomer and battery package

CN224217656UCN 224217656 UCN224217656 UCN 224217656UCN-224217656-U

Abstract

The utility model relates to the technical field of batteries and discloses a battery cell and a battery pack, wherein the battery cell comprises a shell, a first weak part and a second weak part, and the shell comprises a first wall with thickness; the first weak portion and the second weak portion are arranged on the first wall, the first weak portion is arranged in a closed track to enclose an explosion-proof area, the second weak portion is arranged at intervals from the first weak portion, the second weak portion falls into the explosion-proof area in the orthographic projection of the first wall along the first direction, and the first weak portion and the second weak portion are configured such that at least one of the first weak portion and the second weak portion is damaged when the internal pressure of the shell reaches a preset threshold value. According to the utility model, the first weak part and the second weak part form an integrated pressure relief structure in the shell, and the additional installation of the explosion-proof valve in the shell is avoided, so that the problem that the performance of the battery monomer is damaged due to the fact that the explosion-proof valve is welded with the shell and a welding seam is easy to fail is avoided. And the utility model can avoid the safety risk caused by the fact that a single weak part cannot be effectively opened.

Inventors

  • Hou Zhanrui
  • HU MINGJIANG
  • YANG WEI

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260508
Application Date
20260317

Claims (12)

  1. 1. A battery cell, comprising: -a housing (10) comprising a first wall (11) having a first direction (Z); A first weak portion (20) provided on the first wall (11), the first weak portion (20) having a structural strength smaller than that of the first wall (11), the first weak portion (20) being arranged in a closed path so as to enclose an explosion-proof area (201); The second weak part (30) is arranged on the first wall (11), the structural strength of the second weak part (30) is smaller than that of the first wall (11), the second weak part (30) and the first weak part (20) are arranged at intervals, and the orthographic projection of the second weak part (30) on the first wall (11) along the first direction (Z) falls into the explosion-proof area (201); The first and second weaknesses (20, 30) are configured such that when the internal pressure of the housing (10) reaches a preset threshold, at least one of the first and second weaknesses (20, 30) is broken to release the internal pressure of the housing (10).
  2. 2. The battery cell according to claim 1, wherein the first wall (11) is provided with a first face (111) and a second face (112) arranged opposite each other, the first face (111) being arranged towards the outside of the housing (10) along the first direction (Z), the second face (112) being arranged towards the inside of the housing (10) along the first direction (Z); One of the first weak part (20) and the second weak part (30) is arranged on the first surface (111), and the other is arranged on the second surface (112).
  3. 3. The battery cell according to claim 1 or 2, wherein the first weak portion (20) is a groove (21) and/or the second weak portion (30) is a groove (21).
  4. 4. A battery cell according to claim 3, wherein the recess (21) is arranged to extend in a closed trajectory, the recess (21) comprises a recess bottom wall (211), the recess bottom wall (211) is provided with a score (22), the score (22) is arranged to extend in the extending direction of the recess (21), the recess size of the score (22) is H 1 in the first direction (Z), and the recess sizes H 2 ,H 1 and H 2 of the recess (21) satisfy H 1 <H 2 .
  5. 5. The battery cell of claim 1, further comprising a first connection portion (40), the first connection portion (40) being disposed within the first frangible portion (20), the first connection portion (40) connecting the first wall (11) with the first frangible portion (20).
  6. 6. The battery cell according to claim 5, wherein in a first direction (Z), the orthographic projection of the second weakened portion (30) at the first wall (11) at least partially overlaps the orthographic projection of the first connecting portion (40) at the first wall (11).
  7. 7. The battery cell according to claim 5, wherein the first wall (11) further has a second direction (X) perpendicular to the first direction (Z), the battery cell further comprises a second connecting portion (50), the second connecting portion (50) is provided in the second weak portion (30), the second connecting portion (50) connects the first wall (11) and the second weak portion (30), and the second connecting portion (50) and the first connecting portion (40) are located on the same side of the explosion-proof area (201) centered in the second direction (X).
  8. 8. The battery cell according to claim 1, further comprising a bottom plate (60), the bottom plate (60) being provided in the housing (10), the bottom plate (60) being provided at a distance from the first wall (11), a gap between the bottom plate (60) and the first wall (11) forming an exhaust space (601), the bottom plate (60) being provided with a plurality of ventilation holes (61) communicating with the exhaust space (601).
  9. 9. The battery cell according to claim 8, wherein the orthographic projection of the first weak portion (20) on the bottom plate (60) along the first direction (Z) of the first wall (11) falls at least partially within the distribution area (611) of the plurality of ventilation holes (61), and/or wherein the orthographic projection of the second weak portion (30) on the bottom plate (60) along the first direction (Z) of the first wall (11) falls at least partially within the distribution area (611) of the plurality of ventilation holes (61).
  10. 10. The battery cell of claim 8, further comprising a support member (70), the support member (70) being connected between the bottom plate (60) and the first wall (11), the support member (70) being provided in plurality, the plurality of support members (70) being disposed at least around the explosion-proof area (201).
  11. 11. The battery cell of claim 10, further comprising a first positioning member (62) and a second positioning member (71), wherein one of the first positioning member (62) and the second positioning member (71) is disposed on the bottom plate (60), the other is disposed on the supporting member (70), and the first positioning member (62) is cooperatively connected with the second positioning member (71).
  12. 12. A battery pack comprising the battery cell according to any one of claims 1 to 11.

Description

Battery monomer and battery package Technical Field The utility model relates to the technical field of batteries, in particular to a battery monomer and a battery pack. Background With the development of lithium battery technology, the safety and reliability of the battery cell are receiving attention from users. The normal bottom row battery monomer is arranged by arranging the explosion-proof valve and the conductive end in a branching way, the explosion-proof valve is arranged at the bottom of the shell of the battery monomer, so that the explosion-proof valve and the conductive end are separated in physical space, and when the battery monomer is out of control, high-temperature gas and eruption are far away from the conductive end, thereby realizing thermoelectric separation. At present, explosion-proof holes are generally formed in the bottom of a single battery shell, and then an explosion-proof valve and the shell are welded, so that the explosion-proof valve cover seals the explosion-proof holes. However, the welding seam between the explosion-proof valve and the shell is easy to fail, so that the performance of the battery cell is damaged. Disclosure of utility model The utility model aims to provide a battery monomer and a battery pack, which are used for solving the problem that in the prior art, an explosion-proof valve is welded with a shell, and a welding seam is easy to fail, so that the performance of the battery monomer is damaged. In order to achieve the above purpose, the present utility model adopts the following technical scheme: one aspect of the present utility model provides a battery cell including: a housing including a first wall having a first orientation; The first weak part is arranged on the first wall, the structural strength of the first weak part is smaller than that of the first wall, and the first weak part is arranged in a closed track to enclose an explosion-proof area; the second weak part is arranged on the first wall, the structural strength of the second weak part is smaller than that of the first wall, the second weak part and the first weak part are arranged at intervals, and the second weak part falls into the explosion-proof area along the orthographic projection of the first wall in the first direction of the first wall; The first and second weaknesses are configured such that when the internal pressure of the housing reaches a preset threshold, at least one of the first and second weaknesses is broken to release the housing internal pressure. In some embodiments, the first wall is provided with oppositely disposed first and second faces, the first face being disposed toward the housing exterior along the first direction, the second face being disposed toward the housing interior along the first direction; One of the first weak part and the second weak part is arranged on the first surface, and the other is arranged on the second surface. In some embodiments, the first weaknesses are grooves and/or the second weaknesses are grooves. In some embodiments, the grooves extend in a closed track, the grooves comprise groove bottom walls, the groove bottom walls are provided with scores, the scores extend along the extending direction of the grooves, the concave sizes of the scores are H 1 along the first direction, and the concave sizes of the grooves are H 2,H1 and H 2, so that H 1<H2 is satisfied. In some embodiments, the battery cell further includes a first connection portion disposed within the first weak portion, the first connection portion connecting the first wall with the first weak portion. In some embodiments, in the first direction, an orthographic projection of the second weakened portion on the first wall at least partially overlaps an orthographic projection of the first connecting portion on the first wall. In some embodiments, the first wall further has a second direction perpendicular to the first direction, and the battery cell further includes a second connection portion disposed within the second weak portion, the second connection portion connecting the first wall and the second weak portion, the second connection portion and the first connection portion being located on a same side of the explosion-proof area center in the second direction. In some embodiments, the battery cell further comprises a bottom plate, the bottom plate is arranged in the shell, the bottom plate is arranged at intervals with the first wall, a gap between the bottom plate and the first wall forms an exhaust space, and the bottom plate is provided with a plurality of vent holes communicated with the exhaust space. In some embodiments, the orthographic projection of the first weakened portion on the bottom plate along the first direction of the first wall at least partially falls within a distribution area of the plurality of ventilation holes, and/or the orthographic projection of the second weakened portion on the bottom plate along the first direction of the first wal