CN-224217551-U - Battery pack and electricity utilization device

CN224217551UCN 224217551 UCN224217551 UCN 224217551UCN-224217551-U

Abstract

The application discloses a battery pack and an electricity utilization device, which belong to the technical field of batteries, and in the battery pack of the embodiment of the application, a flow channel and a first exhaust hole are arranged on a liquid cooling plate, an exhaust channel communicated with the first exhaust hole is arranged between the liquid cooling plate and a bottom plate, and a converging channel connected with the exhaust channel is arranged on a side plate, so that the exhaust function and the flow channel heat management function can be effectively integrated, on one hand, the space utilization rate of the battery pack is improved, the volume energy density is improved, on the other hand, high-temperature gas is discharged out of the battery pack through a pressure relief device on the side plate, and the battery pack is prevented from being damaged or other safety problems caused by overhigh pressure. In addition, the exhaust channel is arranged between the liquid cooling plate and the bottom plate, so that the influence of exhaust on the single battery during thermal runaway can be reduced. Moreover, the liquid cooling plate can also play an anti-collision sealing role, when the bottom plate of the battery pack is scratched or impacted, the liquid cooling plate can still play a sealing role above the bottom plate, and the problems of short circuit and the like caused by external water vapor entering are reduced.

Inventors

TANG YONGCONG
Jing Daifan
LIU DINGHAI
ZHAI DONG

Assignees

欣旺达动力科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20250529

Claims (10)

1. A battery pack having intersecting first, second and third directions, the battery pack comprising: The box body comprises a bottom plate and a plurality of side plates connected with the bottom plate, and the bottom plate and the side plates are enclosed to form a containing cavity; The liquid cooling plate is arranged in the accommodating cavity, a flow passage is formed in the liquid cooling plate, an exhaust passage is formed by enclosing the liquid cooling plate and the bottom plate, the liquid cooling plate is provided with a plurality of first exhaust holes, the first exhaust holes penetrate through the liquid cooling plate in the third direction and are communicated with the exhaust passage, the plurality of first exhaust holes are arranged along the first direction, and the flow passage is arranged on two sides of the first exhaust holes in the second direction; At least one side plate is provided with a converging channel, an air inlet and an air outlet, wherein the converging channel is communicated with the exhaust channel through the air inlet; The side plates are provided with pressure relief devices, and the air outlet is covered and sealed by the pressure relief devices.
2. The battery pack of claim 1, wherein the liquid cooling plate comprises a first cooling plate and a second cooling plate which are connected, the first cooling plate and the second cooling plate are enclosed to form the flow channel, the second cooling plate is arranged on one side of the first cooling plate, which is close to the bottom plate, and the second cooling plate is enclosed to form the exhaust channel, and the first exhaust hole penetrates through the first cooling plate and the second cooling plate.
3. The battery pack according to claim 2, wherein the side plate includes a stepped portion having at least part of the air inlet, the stepped portion being connected to the first cold plate along the third direction.
4. The battery pack of claim 2, wherein the battery pack includes a seal, the sealing piece is arranged between the second cold plate and the side plate and is respectively connected with the second cold plate and the side plate.
5. A battery pack according to claim 3, wherein the side plate includes a first plate member and a second plate member disposed at intervals along the first direction, the second plate member being provided with the pressure relief device; The side plates comprise a third plate and a fourth plate which are arranged at intervals along the third direction, the third plate and the fourth plate are arranged between the first plate and the second plate, and the third plate is respectively connected with the first plate and the second plate; the step part is arranged between the first plate and the fourth plate, one end of the fourth plate is connected with the second plate, the other end of the fourth plate is connected with the first plate through the step part, and the fourth plate is connected with the bottom plate along the third direction; The step portion, the first plate, the second plate, the third plate and the fourth plate enclose to form the bus channel.
6. The battery pack according to claim 5, wherein the side plate includes a fifth plate member disposed in the confluence passage, the fifth plate member being disposed between the third plate member and the fourth plate member and connected to the first plate member and the second plate member, respectively, the fifth plate member being located at a side of the pressure relief device near the bottom plate, the fifth plate member having a second exhaust hole communicating with the air inlet and the air outlet, respectively, through the confluence passage.
7. The battery pack according to claim 6, wherein the number of the second air vents is plural, the sectional area of the plural second air vents is S 1 mm 2 , the air vent area of the pressure relief device is S mm 2 , S 1 is greater than or equal to S, and/or The number of the air inlets is multiple, the sectional areas of the air inlets are S 2 mm 2 , the exhaust area of the pressure relief device is S mm 2 , and S 2 is more than or equal to S.
8. The battery pack of claim 1, wherein the battery pack further comprises: The battery packs are positioned in the accommodating cavity and are positioned at one side of the liquid cooling plate away from the bottom plate, each battery pack comprises a plurality of single batteries arranged along the first direction, each single battery is provided with an explosion-proof valve arranged towards the first exhaust hole, and one side of each single battery away from the liquid cooling plate is provided with a pole column; The runner comprises a plurality of first sub-runners and a plurality of second sub-runners, wherein the first sub-runners are arranged at intervals along the second direction, and the second sub-runners are connected with two adjacent first sub-runners.
9. The battery pack of claim 1, wherein the liquid cooling plate comprises a sealing film covering the first vent hole.
10. An electrical device comprising the battery pack of any one of claims 1 to 9.

Description

Battery pack and electricity utilization device Technical Field The application belongs to the technical field of batteries, and particularly relates to a battery pack and an electric device. Background Along with the development and popularization of new energy automobiles, the safety requirement on the battery pack is higher and higher, the battery pack with the downward design of the common single battery explosion-proof valve is generally only sealed in a single layer at the bottom, and when the bottom scraping test and the ball striking test are carried out, the sealing failure is easy to cause, so that the battery pack is poor in airtight and easy to short-circuit. Disclosure of utility model The embodiment of the utility model provides a battery pack and an electric device, and aims to solve the technical problem that a battery pack with an explosion-proof valve of a single battery designed downwards is easy to cause sealing failure when being bumped and impacted by external force. The embodiment of the application provides a battery pack, which is provided with a first direction, a second direction and a third direction which are intersected, and comprises: The box body comprises a bottom plate and a plurality of side plates connected with the bottom plate, and the bottom plate and the side plates are enclosed to form a containing cavity; The liquid cooling plate is arranged in the accommodating cavity, a flow passage is formed in the liquid cooling plate, an exhaust passage is formed by enclosing the liquid cooling plate and the bottom plate, the liquid cooling plate is provided with a plurality of first exhaust holes, the first exhaust holes penetrate through the liquid cooling plate in the third direction and are communicated with the exhaust passage, the plurality of first exhaust holes are arranged along the first direction, and the flow passage is arranged on two sides of the first exhaust holes in the second direction; At least one side plate is provided with a converging channel, an air inlet and an air outlet, and the converging channel is communicated with an exhaust channel through the air inlet; The side plate is provided with a pressure relief device, and the pressure relief device covers the air outlet. In some embodiments, the liquid cooling plate includes a first cooling plate and a second cooling plate connected to each other, the first cooling plate and the second cooling plate enclose to form the flow channel, the second cooling plate is disposed on a side of the first cooling plate near the bottom plate and encloses with the bottom plate to form the exhaust channel, and the first exhaust hole penetrates through the first cooling plate and the second cooling plate; In some embodiments, the side plate includes a step having at least a portion of the air inlet, the step being connected to the first cold plate along the third direction. In some embodiments, the battery pack includes a seal disposed between and connected to the second cold plate and the side plate, respectively. In some embodiments, the side plate comprises a first plate and a second plate arranged at intervals along the first direction, the second plate being provided with the pressure relief device; The side plates comprise a third plate and a fourth plate which are arranged at intervals along the third direction, the third plate and the fourth plate are arranged between the first plate and the second plate, and the third plate is respectively connected with the first plate and the second plate; the step part is arranged between the first plate and the fourth plate, one end of the fourth plate is connected with the second plate, the other end of the fourth plate is connected with the first plate through the step part, and the fourth plate is connected with the bottom plate along the third direction; The step portion, the first plate, the second plate, the third plate and the fourth plate enclose to form the bus channel. In some embodiments, the side plate comprises a fifth plate, the fifth plate is arranged in the converging channel, the fifth plate is arranged between the third plate and the fourth plate and is respectively connected with the first plate and the second plate, the fifth plate is positioned on one side of the pressure relief device, which is close to the bottom plate, and the fifth plate is provided with a second exhaust hole, and the second exhaust hole is respectively communicated with the air inlet and the air outlet through the converging channel. In some embodiments, the number of the second exhaust holes is a plurality, the cross-sectional area of the plurality of the second exhaust holes is S 1 mm2, the exhaust area of the pressure relief device is S mm 2, and the conditions that S 1 is more than or equal to S and/or The number of the air inlets is multiple, the sectional areas of the air inlets are S 2 mm2, the exhaust area of the pressure relief device is S mm 2, and S 2 is more than or equa