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CN-224217661-U - Battery and electricity utilization device

CN224217661UCN 224217661 UCN224217661 UCN 224217661UCN-224217661-U

Abstract

The application relates to the technical field of batteries and discloses a battery and an electric device. Each battery cell group is arranged in the accommodating cavity along the second direction, each battery cell group comprises a plurality of battery cells which are arranged along the first direction, each battery cell is provided with an explosion-proof valve, the inner cover plate is arranged in the accommodating cavity and is connected with one surface of the outer cover plate, which faces the battery cell group, the inner cover plate comprises a plurality of first pressure relief parts which extend along the first direction, each first pressure relief part is arranged in the accommodating cavity along the second direction, a first pressure relief channel is arranged between each first pressure relief part and the outer cover plate, the explosion-proof valves of each battery cell are arranged on one surface of each battery cell, which is opposite to the first pressure relief part, and a plurality of first pressure relief holes which are sealed by the pressure relief part cover are formed in the positions, which are opposite to the explosion-proof valves. The application can reduce the diffusion of high-pressure gas and eruption in the battery, and reduce the risk of thermal runaway propagation.

Inventors

  • LIU JIANLONG
  • ZHAO HAIXU
  • LI YANGXING

Assignees

  • 欣旺达动力科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250528

Claims (11)

  1. 1. A battery having a first direction (X), a second direction (Y) and a third direction (Z) perpendicular to each other, comprising: the box body (1) is provided with a containing cavity (2); An outer cover plate (3) which is connected with the box body (1) and is used for sealing the accommodating cavity (2); The battery cell groups (4) are arranged in the accommodating cavity (2) along the second direction (Y), each battery cell group (4) comprises a plurality of battery cells arranged along the first direction (X), and each battery cell is provided with an explosion-proof valve (8); The inner cover plate (5) is arranged in the accommodating cavity (2) and is connected with one surface of the outer cover plate (3) facing the battery cell group (4), the inner cover plate (5) comprises a plurality of first pressure relief parts (6), each first pressure relief part (6) extends along the first direction (X), and each first pressure relief part (6) is arranged in the accommodating cavity (2) along the second direction (Y); The battery is further provided with first pressure relief channels (7), the first pressure relief channels (7) are arranged between the first pressure relief parts (6) and the outer cover plate (3), and the explosion-proof valves (8) of the battery cores are arranged on one surfaces of the battery cores opposite to the first pressure relief parts (6); Each first pressure relief part (6) is provided with a plurality of first pressure relief holes (9), and each first pressure relief hole (9) is arranged at a position opposite to the explosion-proof valve (8); The pressure release device further comprises a plurality of pressure release pieces (10), wherein each pressure release piece (10) is connected with the first pressure release part (6) and covers the first pressure release hole (9).
  2. 2. The battery according to claim 1, wherein the inner cover plate (5) further comprises a body portion (501) attached to the outer cover plate (3) and a plurality of first baffle portions (502), one end of each of the plurality of first baffle portions (502) in the third direction (Z) is connected to the cell group (4), the other end of each of the plurality of first baffle portions (502) in the third direction (Z) is connected to the body portion (501), each of the first baffle portions (502) extends in the first direction (X), and each of the two ends of each of the cell groups (4) in the second direction (Y) is provided with the first baffle portion (502) respectively.
  3. 3. The battery according to claim 2, wherein the inner cover plate (5) further includes a plurality of second pressure relief portions (503) and a plurality of second barrier portions (504), both ends of each of the cell groups (4) in the second direction (Y) are provided with the second pressure relief portions (503) and the second barrier portions (504), each of the second pressure relief portions (503) and each of the second barrier portions (504) extends in the first direction (X), and the first pressure relief portions (6), the second pressure relief portions (503), the second barrier portions (504), and the first barrier portions (502) are connected in order; The inner cover plate (5) further comprises a second pressure relief channel (11) and a second pressure relief hole (12), the second pressure relief channel (11) is arranged on the first pressure relief portion (6), the second pressure relief portion (503), the second baffle portion (504), the first baffle portion (502) and the body portion (501) are arranged between each other, and the second pressure relief hole (12) is formed in the second pressure relief portion (503) towards one face of the battery cell group (4).
  4. 4. A battery according to claim 3, wherein each of the second pressure release portions (503) is provided obliquely, and a height of one end of each of the second pressure release portions (503) near the first pressure release portion (6) in the second direction (Y) is greater than a height of the other end of each of the second pressure release portions (503) far from the first pressure release portion (6) in the second direction (Y).
  5. 5. A battery according to claim 3, wherein the inner cover plate (5) further comprises a third baffle portion (505) and a fourth baffle portion (506), the third baffle portion (505) and the fourth baffle portion (506) are disposed in each of the second pressure release passages (11) in a staggered manner along the third direction (Z), each of the third baffle portion (505) and each of the fourth baffle portion (506) extends along the first direction (X), the third baffle portion (505) is connected to the first pressure release portion (6), and the fourth baffle portion (506) is connected to the second baffle portion (504).
  6. 6. The battery according to claim 1, further comprising a first gap (13), the first gap (13) being arranged between the venting member (10) and the explosion-proof valve (8).
  7. 7. The battery according to claim 2, further comprising a second gap (14), the second gap (14) being arranged between the body portion (501) and the outer cover plate (3).
  8. 8. The battery of claim 1, further comprising: The battery cell structure comprises a plurality of connecting pieces (15), wherein two adjacent battery cells in the second direction (Y) are provided with the connecting pieces (15), the battery cell structure comprises a first connecting section (1501), a second connecting section (1502) and a third connecting section (1503), the second connecting section (1502) and the third connecting section (1503) are respectively arranged at two ends of the first connecting section (1501) in the second direction (Y), the second connecting section (1502) is connected with one of the two adjacent battery cells in the second direction (Y), and the third connecting section (1503) is connected with the other battery cell.
  9. 9. The battery of claim 8, further comprising: The plurality of support beams (16), each support beam (16) set is arranged in the accommodating cavity (2) along the second direction (Y), the support beams (16) are arranged between two adjacent cell sets (4), the support beams (16) extend along the first direction (X), and the second connecting section (1502) and the third connecting section (1503) are respectively arranged on two sides of the support beams (16) along the second direction (Y); -an elastic member (17) arranged between the second connection section (1502) and the support beam (16) and/or between the third connection section (1503) and the support beam (16).
  10. 10. The battery according to claim 1, characterized in that the first pressure relief channel (7) is through-going in the first direction (X), and the pressure relief piece (10) and the explosion proof valve (8) are arranged one-to-one.
  11. 11. An electrical device, comprising: the battery of any one of claims 1 to 10.

Description

Battery and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to a battery and an electric device. Background In the design of batteries, electrical connection, thermal management and safety protection of the cells are vital links. The explosion-proof valve design of the battery core has a decisive effect on the safety of the battery, and can rapidly discharge internal high-pressure gas when the battery core is in thermal runaway, so that the explosion of the battery is avoided. At present, a short-cutter battery cell is used as a high-performance battery unit, and is widely applied to the fields of electric automobiles, energy storage systems and the like due to high energy density and excellent safety. Because the electric core pole of short sword electric core is located two opposite sides, and explosion-proof valve is located the top of short sword electric core, consequently when the electric core takes place thermal runaway, high-pressure gas and eruption thing spread in the battery inside easily, have increased the risk of thermal runaway propagation. Disclosure of utility model The application provides a battery and an electric device, which are used for solving the problems that when a battery core is in thermal runaway, high-pressure gas and eruption are easy to diffuse in the battery, and the risk of thermal runaway propagation is increased. In a first aspect, the application provides a battery, which is provided with a first direction, a second direction and a third direction which are perpendicular to each other, and comprises a box body, an outer cover plate, a plurality of cell groups, an inner cover plate and a plurality of pressure release pieces. The box body is provided with a containing cavity. The outer cover plate is connected with the box body and used for sealing the accommodating cavity. Each battery cell group comprises a plurality of battery cells which are arranged in the accommodating cavity along the second direction, each battery cell is provided with an explosion-proof valve, an inner cover plate which is arranged in the accommodating cavity and is connected with one surface of the outer cover plate, which faces the battery cell group, the inner cover plate comprises a plurality of first pressure relief parts, each first pressure relief part extends along the first direction and is arranged in the accommodating cavity along the second direction, a first pressure relief channel is arranged between each first pressure relief part and the outer cover plate, each explosion-proof valve of each battery cell is arranged on one surface of each battery cell, which is opposite to the first pressure relief part, each first pressure relief part is provided with a plurality of first pressure relief holes, each first pressure relief hole is arranged at a position opposite to the explosion-proof valve, and the battery further comprises a plurality of pressure relief pieces, each first pressure relief part is connected with each first pressure relief hole. The battery cell explosion-proof valve has the beneficial effects that the first pressure relief part extending along the arrangement direction of the battery cell groups and the corresponding first pressure relief holes are arranged on the inner cover plate, and the first pressure relief channel is formed by combining the outer cover plate, so that high-pressure gas sprayed by the battery cell explosion-proof valve is guided to the outside in a directional manner, and disordered diffusion of gas and sprayed matters in the battery box is avoided. The design of the pressure release part cover sealing pressure release hole ensures tightness under normal working conditions, and only breaks and releases pressure when in thermal runaway, so that quick pressure release and thermal runaway isolation are realized, and the thermal diffusion risk is obviously reduced. In an optional embodiment, the inner cover plate further includes a body portion attached to the outer cover plate and a plurality of first baffle portions, one ends of the first baffle portions in the third direction are connected to the battery cell group, the other ends of the first baffle portions in the third direction are connected to the body portion, the first baffle portions extend in the first direction, and two ends of the battery cell group in the second direction are respectively provided with the first baffle portions. The electric core assembly has the beneficial effects that the electric core assembly is connected with the outer cover plate body along the third direction through the first baffle plate part to form a physical isolation barrier, so that the eruption is prevented from directly impacting the outer cover plate or the adjacent electric core assembly. The extending direction of the baffle plate part is consistent with the arrangement direction of the battery cells, so that the airflow path