Search

CN-224217654-U - Battery pack

CN224217654UCN 224217654 UCN224217654 UCN 224217654UCN-224217654-U

Abstract

The application relates to the technical field of batteries, and provides a battery pack which comprises a battery pack, a battery box and a sensor assembly, wherein the battery pack comprises a plurality of batteries, the battery box comprises a supporting plate, a bottom plate and a frame, the supporting plate is positioned on one side of the battery, which is provided with an explosion-proof valve, the bottom plate is positioned on one side of the supporting plate, which is away from the battery, an exhaust channel is formed between the supporting plate and the bottom plate, a plurality of weak areas are formed on the supporting plate, orthographic projections of the explosion-proof valve and the weak areas on the bottom plate are at least partially overlapped, a pressure relief hole which is communicated with the exhaust channel and the outside of the battery box is formed on the frame, the total area of the pressure relief hole is M 2 , the space of a sensor probe of the sensor assembly is communicated with the exhaust channel, the shortest distance between the sensor probe and the pressure relief hole in the direction parallel to the bottom plate is L, the unit of L is mm, and the ratio of L to M is more than or equal to 0.001 and less than or equal to 0.06. The sensor component has high sensitivity and safety stability.

Inventors

  • HOU AISHENG
  • NIU LI

Assignees

  • 中创新航科技集团股份有限公司

Dates

Publication Date
20260508
Application Date
20250526

Claims (17)

  1. 1. A battery pack, the battery pack comprising: A battery pack (1), wherein the battery pack (1) comprises a plurality of batteries (11), and an explosion-proof valve (111) is arranged on the batteries (11); The battery box (2), battery box (2) includes backup pad (21), bottom plate (22), frame (23) are followed the border of bottom plate (22) sets up, in order to form accommodation space (9) that are used for holding group battery (1), backup pad (21) are located battery (11) are provided with one side of explosion-proof valve (111), bottom plate (22) are located backup pad (21) face away from battery (11) one side, bottom plate (22) with backup pad (21) are relative and the interval sets up, form exhaust passage (3) between backup pad (21) and bottom plate (22); wherein a plurality of weak areas (211) are formed on the supporting plate (21), the orthographic projection of the explosion-proof valve (111) on the bottom plate (22) and the orthographic projection of the weak areas (211) on the bottom plate (22) at least partially overlap, one or a plurality of pressure relief holes (231) communicated between the exhaust channel (3) and the outside of the battery box (2) are formed on the frame (23), and the total area of one or a plurality of the pressure relief holes (231) is M, and the unit of M is mm 2 ; The sensor assembly (4), the sensor assembly (4) includes sensor probe (41), sensor probe (41) place space with exhaust passage (3) intercommunication, sensor probe (41) with pressure release hole (231) be parallel to in the shortest distance of bottom plate (22) direction is L, and L's unit is mm, and L and M's ratio satisfies 0.001 and is less than or equal to L/M and is less than or equal to 0.06.
  2. 2. The battery pack according to claim 1, wherein the front projection of the sensor probe (41) on the base plate (22) and the front projection of the explosion-proof valve (111) on the base plate (22) do not overlap.
  3. 3. The battery pack according to claim 1, wherein the frame (23) is of a hollow structure, the hollow structure of the frame (23) forms a cavity (5), the cavity (5) is communicated with the exhaust channel (3), and the pressure release hole (231) is communicated between the outside of the battery box (2) and the cavity (5).
  4. 4. A battery pack according to claim 3, wherein the mould cavity (5) and the vent channel (3) communicate through one or more vents (6), the total area of the vents (6) being larger than the total area of the pressure relief holes (231).
  5. 5. The battery pack of claim 4, wherein the battery pack further comprises: the flow guide piece (7) is positioned in the battery box (2), a flow guide channel (8) is formed in the flow guide piece (7), a first connecting port (71) and a second connecting port (72) which are communicated with the flow guide channel (8) are also formed in the flow guide piece (7), the first connecting port (71) is communicated with the cavity (5), and the second connecting port (72) is communicated with the exhaust channel (3); wherein the second connection port (72) forms the vent (6).
  6. 6. The battery pack according to claim 5, wherein the flow guide (7) comprises: The separation plate (73), the separation plate (73) is used for separating the diversion channel (8) into a first diversion channel (81) and a second diversion channel (82), and a diversion opening (731) used for communicating the first diversion channel (81) with the second diversion channel (82) is formed on the separation plate (73); Wherein, the air vent (6) communicate in the second water conservancy diversion passageway (82) keep away from one side of first water conservancy diversion passageway (81), first connecting port (71) communicate one side of first water conservancy diversion passageway (81) in first direction, the distribution direction of first water conservancy diversion passageway (81) and second water conservancy diversion passageway (82) with first direction is crossing, in single water conservancy diversion spare (7), water conservancy diversion trompil (731) is less than in the area of the orthographic projection of air vent (6) on bottom plate (22) on the area of orthographic projection.
  7. 7. The battery pack according to claim 6, wherein the first flow guide channel (81) is located at a side of the second flow guide channel (82) facing away from the bottom plate (22), the sensor assembly (4) further comprises a sensor body (42), the sensor body (42) is arranged at a side of the flow guide (7) facing away from the bottom plate (22), and the sensor probe (41) is located at least partially at the first flow guide channel (81).
  8. 8. The battery pack according to claim 5, wherein the battery pack comprises one or more flow guide members (7), the flow guide members (7) are positioned at the corner positions of the battery box (2) on one side of the bottom plate (22), the one or more flow guide members (7) comprise first flow guide members (701), and the second connection ports (72) on the first flow guide members (701) are nearest to the pressure release holes (231) in all the flow guide members (7); wherein, the L/M is more than or equal to 0.0022 and less than or equal to 0.06.
  9. 9. The battery pack according to claim 8, wherein one or more of the flow guides (7) comprises a second flow guide (702), and among all flow guides (7), a second connection port (72) on the second flow guide (702) is furthest from the pressure release hole (231); Wherein, the L/M is more than or equal to 0.0018 and less than or equal to 0.055.
  10. 10. The battery pack according to claim 9, wherein the battery case (2) comprises a plurality of corners on one side of the bottom plate (22), each corner being provided with the flow guide (7); wherein, the L/M is more than or equal to 0.0012 and less than or equal to 0.05.
  11. 11. The battery pack of claim 1, wherein 500mm 2 ≤M≤3000mm 2 .
  12. 12. The battery pack according to claim 1, wherein the battery box (2) further includes: Reinforcing beam (10), reinforcing beam (10) are used for with accommodation space (9) in battery case (2) are divided into first accommodation space (91) and second accommodation space (92), group battery (1) are located first accommodation space (91), sensor subassembly (4) are located second accommodation space (92).
  13. 13. The battery pack according to claim 1, wherein the sensor assembly (4) comprises one or more of a hydrogen sensor, a carbon dioxide sensor, a carbon monoxide sensor, a smoke sensor, a gas pressure sensor, a drain sensor, a temperature sensor.
  14. 14. The battery pack of claim 1, wherein the battery pack further comprises: The buffer cushion is arranged between the supporting plate (21) and the bottom plate (22), and L/M is more than or equal to 0.001 and less than or equal to 0.048.
  15. 15. The battery pack according to claim 1, wherein the support plate (21) is a cold plate, a liquid cooling channel is formed inside the cold plate, and the cold plate is adhered to the bottom of the battery pack (1), and L/M is more than or equal to 0.001 and less than or equal to 0.045.
  16. 16. The battery pack according to claim 1, wherein the pressure release hole (231) and the bottom plate (22) are spaced apart from each other by a distance of 30 mm≤a≤200 mm in a direction perpendicular to the bottom plate (22).
  17. 17. The battery pack according to claim 1, wherein the weakened area (211) is a through hole formed in the support plate (21).

Description

Battery pack Technical Field The utility model relates to the technical field of batteries, in particular to a battery pack. Background The sensor assembly is generally arranged in the battery pack, and the sensor assembly can judge whether the battery in the battery pack is out of control or not by detecting parameters such as gas components, temperature, pressure and the like in the battery pack. However, in the related art, the sensor assembly is generally disposed in an electrical compartment of the battery pack or in the vicinity of the battery explosion-proof valve, thereby causing a problem in that the sensitivity is low or the sensor assembly is easily damaged when thermal runaway of the battery occurs. It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art. Disclosure of utility model The utility model provides a battery pack, which can solve the technical problems that the sensitivity of a sensor assembly is low, and the sensor assembly is easily and rapidly damaged when the battery is in thermal runaway. The battery pack includes: the battery pack comprises a plurality of batteries, and explosion-proof valves are arranged on the batteries; The battery box comprises a supporting plate, a bottom plate and a frame, wherein the frame is arranged along the edge of the bottom plate to form an accommodating space for accommodating a battery pack, the supporting plate is positioned on one side of the battery, which is provided with an explosion-proof valve, the bottom plate is positioned on one side of the supporting plate, which is away from the battery, the bottom plate is opposite to the supporting plate and is arranged at intervals, and an exhaust channel is formed between the supporting plate and the bottom plate; Wherein, a plurality of weak areas are formed on the supporting plate, the orthographic projection of the explosion-proof valve on the bottom plate and the orthographic projection of the weak areas on the bottom plate are overlapped at least partially, one or a plurality of pressure relief holes communicated between the exhaust channel and the outside of the battery box are formed on the frame, the total area of the one or a plurality of pressure relief holes is M, and the unit of M is mm 2; The sensor assembly comprises a sensor probe, a space where the sensor probe is located is communicated with the exhaust channel, the shortest distance between the sensor probe and the pressure relief hole in the direction parallel to the bottom plate is L, the unit of L is mm, and the ratio of L to M is more than or equal to 0.001 and less than or equal to 0.06. In the application, when the battery is in thermal runaway, the high-temperature high-pressure gas in the battery is released through the explosion-proof valve and enters the exhaust channel through the weak area on the supporting plate, the gas in the exhaust channel can be released to the outside of the battery box through the pressure relief hole, and the sensor component can judge whether the battery is in thermal runaway or not through detecting parameters such as gas concentration, temperature, pressure and the like. The area of the pressure relief hole determines the exhaust speed during pressure relief, the larger the area of the pressure relief hole is, the faster the airflow is discharged, correspondingly, the shorter the time reserved for the sensor probe to detect is, so that the sensitivity of the sensor assembly is easy to be reduced, the smaller the area of the pressure relief hole is, the slower the exhaust speed is, the pressure relief capability of the battery pack is poor, and the safety of the battery pack is reduced. In addition, the shortest distance L between the sensor probe and the pressure relief hole in the direction parallel to the bottom plate determines the contact time of the sensor probe and the gas flow and the concentration of the gas, and the gas is finally discharged from the pressure relief hole during pressure relief, so if L is too large, the sensor probe may deviate from the gas flow path, the sensor probe cannot detect the gas, and if L is too small, the high-pressure high-temperature gas flow concentrated around the pressure relief hole may damage the sensor probe. The L/M is set to be of a proper size, so that the sensitivity of the sensor assembly can be guaranteed, the risk of damaging the sensor probe by air flow can be reduced, and the safety and stability of the sensor assembly are improved. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. Drawings For a better understanding of the present disclosure, reference may be made to the embodiments illustr