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CN-224217653-U - Battery monomer and battery package

CN224217653UCN 224217653 UCN224217653 UCN 224217653UCN-224217653-U

Abstract

The utility model relates to the technical field of new energy batteries and discloses a battery unit and a battery pack, wherein the battery unit is provided with a first direction and comprises a shell, the shell is provided with a pressure relief hole and a containing cavity, the pressure relief hole penetrates through the shell along the first direction and is communicated with the containing cavity, an explosion-proof valve is fixedly connected with the shell and seals the pressure relief hole, the explosion-proof valve is provided with a plurality of guide grooves, the guide grooves are distributed in a radial mode, an adhesive layer is attached to one side of the shell, which is away from the containing cavity, along the first direction, a protective cover is arranged on one side of the adhesive layer, which is away from the explosion-proof valve, along the first direction, the protective cover is connected with the adhesive layer and is provided with an exhaust hole, and the exhaust hole and the pressure relief hole are oppositely arranged along the first direction. When the explosion-proof valve is opened due to thermal runaway, the explosion-proof valve is broken from the guide groove, the splinter is large, the explosion-proof valve is prevented from being small fragments or powder, the protective cover is stuck and fixed on the shell through the adhesive layer, and the protective cover can prevent the splinter from splashing.

Inventors

  • Yi Qinxian
  • LIU SHUBAO
  • GE JINBO
  • Wen Yeyong

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250522

Claims (11)

  1. 1. A battery cell, wherein the battery cell has a first direction (Z), the battery cell comprising: A housing (1), the housing (1) having a pressure relief hole (11) and a receiving cavity (14), the pressure relief hole (11) penetrating the housing (1) in the first direction (Z) and communicating with the receiving cavity (14); The explosion-proof valve (2), the explosion-proof valve (2) is fixedly connected with the shell (1) and seals the pressure relief hole (11), the explosion-proof valve (2) is provided with a plurality of guide grooves (21), and the guide grooves (21) are distributed radially; An adhesive layer (3), the adhesive layer (3) being attached to a side of the housing (1) facing away from the accommodation cavity (14) in the first direction (Z); The protection cover (4), protection cover (4) are located viscose layer (3) are followed first direction (Z) deviates from one side of explosion-proof valve (2), protection cover (4) with viscose layer (3) are connected, protection cover (4) have exhaust hole (41), exhaust hole (41) with pressure release hole (11) are followed first direction (Z) is relative to be set up.
  2. 2. The battery cell according to claim 1, further comprising a second direction (Y) and a third direction (X), wherein the first direction (Z), the second direction (Y), and the third direction (X) are perpendicular to each other, the guide groove (21) comprises a first groove (211), a second groove (212), and a third groove (213), the first groove (211) extends along the second direction (Y), the second groove (212) extends along the third direction (X), the first groove (211) is provided with a plurality of grooves along the third direction (X), and the first grooves (211) at both ends intersect the second groove (212), and the third groove (213).
  3. 3. The battery cell according to claim 1, further comprising a second direction (Y) and a third direction (X), wherein the first direction (Z), the second direction (Y), and the third direction (X) are perpendicular to each other, the guide groove (21) comprises a first groove (211), a second groove (212), and a third groove (213), the first groove (211) extends along the second direction (Y), the second groove (212) extends along the third direction (X), and the first groove (211), the second groove (212), and the third groove (213) intersect at a point.
  4. 4. A battery cell according to any one of claims 1-3, wherein the explosion-proof valve is further provided with a reinforcement rib (22), the reinforcement rib (22) extending around the first direction (Z), the reinforcement rib (22) connecting each of the guide grooves (21).
  5. 5. A battery cell according to any one of claims 1-3, characterized in that the pressure relief hole (11) has a hole wall (111), the guide groove (21) decreasing in size in the first direction (Z) from the radiation center of the guide groove (21) to the direction of the hole wall (111).
  6. 6. The battery cell according to claim 5, wherein the guide groove (21) has a gap between an end near the hole wall (111) and the hole wall (111).
  7. 7. A battery cell according to any one of claims 1-3, wherein the housing (1) comprises a bottom plate (12), side plates (15) and a cover plate (13), the bottom plate (12), the side plates (15) and the cover plate (13) are enclosed to form the accommodating cavity (14), and the pressure release hole (11) is formed in the bottom plate (12) or the cover plate (13).
  8. 8. The battery cell according to claim 7, characterized in that in the first direction (Z) there is a gap between the explosion-proof valve (2) and the protective cover (4), the gap being of a size H mm, and in the first direction (Z) the bottom plate (12) or the cover plate (13) being of a size L mm, satisfying H > L.
  9. 9. A battery cell according to any of claims 1-3, wherein the adhesive layer (3) has a central hole (31), the central hole (31) extending through the adhesive layer (3) in the first direction (Z), the central hole (31) being arranged opposite the vent hole (41) in the first direction (Z).
  10. 10. A battery cell according to any one of claims 1-3, wherein the protective cover (4) is a high silicon fabric member.
  11. 11. A battery pack comprising the battery cell of any one of claims 1-10.

Description

Battery monomer and battery package Technical Field The utility model relates to the technical field of new energy batteries, in particular to a battery monomer and a battery pack. Background The battery pack is a core component of the new energy automobile and is mainly formed by connecting and assembling a plurality of lithium ion batteries. In the use process, along with the change of the service environment and service life of the lithium ion battery and the collision of the lithium ion battery caused by unexpected traffic accidents and the like, the interior of the lithium ion battery is thermally abnormal to generate high-temperature and high-pressure substances, and the high-temperature and high-pressure substances in the battery need to be discharged rapidly in time. An explosion-proof valve is usually arranged on the lithium ion battery, and when the gas pressure in the battery reaches the opening pressure of the explosion-proof valve, the gas rushes open the explosion-proof valve to achieve the aim of pressure relief. The existing explosion-proof valve is generally formed by aluminum diaphragms, when the pressure inside the lithium ion battery breaks the explosion-proof valve, the aluminum diaphragms are broken under the pressure and splash is generated, fragments of the aluminum diaphragms do disordered motion when splash is carried out, the fragments serve as metal pieces, and the risk of short circuit exists after the fragments splash to the peripheral lithium ion battery, so that the peripheral lithium ion battery is out of control, and the safety of a battery pack is affected. Disclosure of utility model The utility model aims to provide a battery cell to solve the problem that fragments influence the safety of a battery after an explosion-proof valve of a lithium ion battery in the prior art is opened, and also provides a battery pack using the battery cell. In order to achieve the above object, the present utility model provides a battery cell having a first direction, the battery cell comprising: The shell is provided with a pressure relief hole and a containing cavity, and the pressure relief hole penetrates through the shell along the first direction and is communicated with the containing cavity; The explosion-proof valve is fixedly connected with the shell and seals the pressure relief hole, the explosion-proof valve is provided with a plurality of guide grooves, and the guide grooves are distributed radially; The adhesive layer is attached to one side of the shell, which faces away from the accommodating cavity, along the first direction; The protective cover is arranged on one side, away from the explosion-proof valve, of the adhesive layer along the first direction, the protective cover is connected with the adhesive layer and is provided with an exhaust hole, and the exhaust hole and the pressure relief hole are oppositely arranged along the first direction. In some embodiments, the battery cell further has a second direction and a third direction, the first direction, the second direction, and the third direction are perpendicular to each other, the guide groove has a first groove, a second groove, and a third groove, the first groove extends along the second direction, the second groove extends along the third direction, the first groove is provided with a plurality of grooves along the third direction at intervals, and the first grooves at two ends intersect with the second groove and the third groove along the third direction. In some embodiments, the battery cell further has a second direction and a third direction, the first direction, the second direction, and the third direction are perpendicular to each other, the guide groove has a first groove, a second groove, and a third groove, the first groove extends along the second direction, the second groove extends along the third direction, and the first groove, the second groove, and the third groove intersect at a point. In some embodiments, the explosion protection valve is further provided with a reinforcing rib extending around the first direction, the reinforcing rib connecting each of the guide grooves. In some embodiments, the pressure relief hole has a hole wall from a center of radiation of the guide groove to a direction of the hole wall, the guide groove decreasing in size along the first direction. In some embodiments, a gap is provided between an end of the guide groove adjacent to the hole wall and the hole wall. In some embodiments, the housing includes a bottom plate, a side plate, and a cover plate, the bottom plate, the side plate, and the cover plate enclose to form the accommodating cavity, and the pressure relief hole is formed in the bottom plate or the cover plate. In some embodiments, in the first direction, a gap is formed between the explosion-proof valve and the protective cover, the gap has a dimension of H mm, and in the first direction, the bottom plate or the cover plate has a dimension of L mm,