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CN-122006177-A - Liquid storage fire extinguishing box, thermal runaway prevention system, battery assembly and use method of battery assembly

CN122006177ACN 122006177 ACN122006177 ACN 122006177ACN-122006177-A

Abstract

The invention relates to the field of power batteries, in particular to the field of power batteries, and particularly relates to a liquid storage fire extinguishing box, a thermal runaway prevention system, a battery assembly and a use method of the battery assembly, wherein the use method comprises the steps of a box body, and a storage inner cavity is formed in the box body in a hollow mode; the liquid storage fire extinguishing box disclosed by the invention is arranged in a power battery, one function can be used as a reinforcing piece to ensure the integral structural strength of the electric motor, in addition, the liquid storage fire extinguishing box also can be used as a connecting piece to ensure the lap joint between adjacent battery modules, and most importantly, the liquid storage fire extinguishing box disclosed by the invention can be used for storing fire extinguishing agent in a passive stage and can be used as a fire extinguishing box.

Inventors

  • ZHAO YANBIAO

Assignees

  • 奇瑞商用车（安徽）有限公司

Dates

Publication Date
20260512
Application Date
20260228

Claims (10)

  1. 1. The liquid storage fire extinguishing box is characterized by comprising a box body, wherein a storage inner cavity is formed in the box body in a hollow mode; The box body is provided with a plurality of reserved hole groups, each reserved hole group at least comprises a reserved hole, the reserved holes are communicated with the storage inner cavity, and each reserved hole is provided with a partition protective film.
  2. 2. A fire extinguishing box according to claim 1, wherein the box body is provided with a waterproof and breathable valve.
  3. 3. The liquid storage fire extinguishing box according to claim 1, wherein the box body comprises a lower bottom plate and an upper panel, and the periphery of the upper panel is connected with the periphery of the lower bottom plate through lateral plates; the lower bottom plate comprises transverse plates and trapezoid plates, and adjacent transverse plates are connected through at least one trapezoid plate; the trapezoid plate comprises a lower connecting plate, and two ends of the lower connecting plate are respectively connected with adjacent transverse plates through side connecting plates; The lower connecting plates and the transverse plates are distributed in parallel at intervals.
  4. 4. A thermal runaway prevention system, which is characterized by comprising a liquid storage unit, a pumping unit and a liquid storage fire extinguishing box according to any one of claims 1-3, wherein a cooling medium is arranged in the liquid storage unit; the pumping unit can pump the cooling medium back and forth between the liquid storage unit and the liquid storage fire extinguishing box.
  5. 5. A thermal runaway prevention system according to claim 4, wherein said reservoir unit comprises a reservoir tank, wherein said reservoir tank contains a cooling medium, and wherein said pumping unit comprises a drive pump connected to said reservoir unit and said reservoir fire suppression cartridge via pumping tubing.
  6. 6. A thermal runaway prevention system according to claim 5, wherein the pumping lines comprise a first line, a second line, a third line, and a fourth line, wherein the first line, the second line, the third line, and the fourth line are connected by an electromagnetic four-way valve, wherein the second line and the third line are connected to a drive pump, wherein the first line is connected to a fire suppression cartridge, and wherein the fourth line is connected to a liquid storage tank.
  7. 7. A thermal runaway prevention system according to claim 6, wherein said first conduit is connected to a liquid storage fire suppression cartridge by a fifth conduit.
  8. 8. A battery assembly comprising a power cell and the thermal runaway prevention system of any one of claims 4-7; the power battery comprises a box body and an upper cover, wherein a module battery core is arranged in the box body, and a liquid storage fire extinguishing box in the thermal runaway prevention system is arranged on the module battery core; the module battery core is provided with explosion-proof valves, and each explosion-proof valve corresponds to one reserved hole.
  9. 9. The battery assembly of claim 8, wherein the first, second, third, fourth and fifth conduit ends are each provided with a quick connector.
  10. 10. A method of using the battery assembly of any one of claims 8-9, the method comprising: an active preparation stage and a passive accurate fire extinguishing stage; When the whole vehicle BMS system or the VCU system monitors that the temperature rise speed in the power battery is too high and the voltage is abnormally changed; The whole vehicle BMS system or the VCU system judges that the thermal runaway risk of the power battery exists; giving instructions to the driving pump and the electromagnetic four-way valve, and pumping the fire extinguishing agent from the liquid storage tank into the liquid storage fire extinguishing box to prepare; when the thermal runaway of the power battery occurs, one or more explosion-proof valves of the module battery core explode and spray out high-temperature high-pressure gas-liquid mixture, and a partition protective film at a reserved hole at the bottom of the liquid storage fire extinguishing box right above is heated and pressed to rupture, so that the fire extinguishing agent flows out; Meanwhile, the fire extinguishing agent continuously released in the liquid storage fire extinguishing box reduces the temperature of a thermal runaway area, effectively reduces heat diffusion and improves the fire extinguishing reliability; If the thermal runaway does not occur, the pump is driven to pump the fire extinguishing agent in the liquid storage fire extinguishing box back into the liquid storage tank.

Description

Liquid storage fire extinguishing box, thermal runaway prevention system, battery assembly and use method of battery assembly Technical Field The invention relates to the field of power batteries, in particular to a liquid storage fire extinguishing box, a thermal runaway prevention system, a battery assembly and a use method of the battery assembly. Background With the popularization of electric automobiles and energy storage power stations, the safety of power batteries, especially the problem of thermal runaway, has become the core of industry attention. In the prior art, the linkage of the early warning system and the fire extinguishing system is mostly in a simple alarm-trigger mode, the fire extinguishing agent is released only after confirming the occurrence of thermal runaway, response delay exists, and the optimal intervention opportunity can be missed. Therefore, in order to better solve or improve the above technical problems, improvements on the existing heat protection of the power battery are needed. Disclosure of Invention The invention aims to provide a liquid storage fire extinguishing box which is applicable to active and passive fire extinguishing protection. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: a liquid storage fire extinguishing box comprises a box body, wherein a storage inner cavity is formed in the box body in a hollow mode; The box body is provided with a plurality of reserved hole groups, each reserved hole group at least comprises a reserved hole, the reserved holes are communicated with the storage inner cavity, and each reserved hole is provided with a partition protective film. The box body is provided with a waterproof ventilation valve. The box body comprises a lower bottom plate and an upper panel, wherein the periphery of the upper panel is connected with the periphery of the lower bottom plate through lateral plates; the lower bottom plate comprises transverse plates and trapezoid plates, and adjacent transverse plates are connected through at least one trapezoid plate; the trapezoid plate comprises a lower connecting plate, and two ends of the lower connecting plate are respectively connected with adjacent transverse plates through side connecting plates; The lower connecting plates and the transverse plates are distributed in parallel at intervals. A thermal runaway prevention system comprises a liquid storage unit, a pumping unit and a liquid storage fire extinguishing box, wherein a cooling medium is arranged in the liquid storage unit; the pumping unit can pump the cooling medium back and forth between the liquid storage unit and the liquid storage fire extinguishing box. The liquid storage unit comprises a liquid storage tank, a cooling medium is stored in the liquid storage tank, the pumping unit comprises a driving pump, and the driving pump is connected with the liquid storage unit and the liquid storage fire extinguishing box through pumping pipelines. The pumping pipeline comprises a first pipeline, a second pipeline, a third pipeline and a fourth pipeline, wherein the first pipeline, the second pipeline, the third pipeline and the fourth pipeline are connected through electromagnetic four-way valves, the second pipeline and the third pipeline are connected to a driving pump, the first channel is connected with a liquid storage fire extinguishing box, and the fourth pipeline is connected with a liquid storage tank. The first pipeline is connected with the liquid storage fire extinguishing box through a fifth pipeline. A battery assembly comprising a power battery and the thermal runaway prevention system; the power battery comprises a box body and an upper cover, wherein a module battery core is arranged in the box body, and a liquid storage fire extinguishing box in the thermal runaway prevention system is arranged on the module battery core; the module battery core is provided with explosion-proof valves, and each explosion-proof valve corresponds to one reserved hole. Quick connectors are arranged at the ends of the first pipeline, the second pipeline, the third pipeline, the fourth pipeline and the fifth pipeline. The thermal runaway prevention system fire extinguishing comprises an active preparation stage and a passive accurate fire extinguishing stage; When the whole vehicle BMS system or the VCU system monitors that the temperature rise speed in the power battery is too high and the voltage is abnormally changed; The whole vehicle BMS system or the VCU system judges that the thermal runaway risk of the power battery exists; giving instructions to the driving pump and the electromagnetic four-way valve, and pumping the fire extinguishing agent from the liquid storage tank into the liquid storage fire extinguishing box to prepare; when the thermal runaway of the power battery occurs, one or more explosion-proof valves of the module battery core explode and spray out high-temperature high-pressu