Fire extinguishing system of battery pack, and control method

A control method and battery pack technology, applied to batteries, circuits, electrical components, etc., can solve problems such as fires that cannot be extinguished, thermal runaway, etc.

Active Publication Date: 2021-04-06
CHONGQING JINKANG POWER NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that thermal runaway fire cannot be extinguished and thermal runaway is triggered again by thermal diffusion, the present invention provides a fire extinguishing control method for battery packs

Method used

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  • Fire extinguishing system of battery pack, and control method
  • Fire extinguishing system of battery pack, and control method
  • Fire extinguishing system of battery pack, and control method

Examples

Experimental program
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Embodiment 2

[0074] In the thermal runaway phenomenon recorded in the first embodiment, the thermal diffusion in each stage only affects one battery cell, and the thermal diffusion in each stage only causes a voltage drop of one battery cell. The difference between this embodiment and the first embodiment is that the thermal diffusion in one stage in this embodiment will affect multiple cells at the same time.

[0075] In this embodiment, the BMS control subsystem receives multiple voltage drop signals Vn received at the same time. After each received voltage drop signal, the BMS control subsystem will send an instruction to the water pump, and the water pump can follow the received voltage drop signal. Cumulative execution time of instructions.

[0076] In this embodiment, when thermal runaway occurs in the battery cell, the voltage sensor detects the first voltage drop V1, and the timer records the time T1 when the first voltage drop occurs. The thermally runaway cell spreads to three a...

Embodiment 3

[0079] Since the voltage sensor is used to detect the thermal runaway signal in Embodiment 1 and Embodiment 2, when the thermal runaway in the battery pack lasts for a long time, the flame generated by the thermal runaway will burn the wiring harness or voltage sensor in the battery pack, resulting in voltage The down signal is lost.

[0080] During the experiment, thermal runaway cells caused the air pressure inside the battery pack to rise for a short period of time. Therefore, in this embodiment, an air pressure sensor is provided in the battery pack to detect the thermal runaway signal of the battery pack. The air pressure sensor can be installed in the corner of the box, so that the flame is not easy to burn the air pressure sensor and the wiring harness connected to the air pressure sensor, and the thermal runaway signal can be guaranteed. not lost.

[0081] In this embodiment, the signal acquisition module is an air pressure sensor and a timer, such as image 3As show...

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Abstract

The invention belongs to the technical field of battery pack safety protection, and particularly relates to a fire extinguishing control method of a battery pack. The fire extinguishing control method of the battery pack comprises the steps of calibrating a preset spraying amount and a thermal diffusion signal threshold value; acquiring a thermal runaway signal and occurrence time when thermal runaway occurs in the battery pack, wherein the occurrence time is the time for acquiring the thermal runaway signal; acquiring a thermal diffusion signal based on the thermal runaway signal and the occurrence time; and adjusting the running time and the running power of a water pump in the battery pack based on the spraying amount calibration according to the thermal diffusion signal and the thermal diffusion signal threshold value. By adopting the technical scheme, the actual spraying amount is adjusted according to each thermal diffusion, and flames generated by each thermal runaway are effectively extinguished; and cooling liquid is stored in a spraying subsystem, and thermal runaway caused by subsequent thermal diffusion can be restrained.

Description

technical field [0001] The invention relates to the technical field of battery pack safety protection, in particular to a battery pack fire extinguishing system and a control method. Background technique [0002] At present, electric vehicle safety accidents occur frequently, among which, one of the major factors causing electric vehicle safety accidents is the spontaneous combustion of batteries. Therefore, in the prior art, a sprinkler subsystem is set to spray and extinguish the battery pack to prevent the battery pack from exploding. [0003] However, the spraying subsystem of the existing battery pack cannot control the amount of spraying liquid. If the amount of spraying liquid is small, the spraying liquid cannot extinguish the fire in time, resulting in thermal diffusion of the thermally runaway battery cells. If a large amount of spray liquid is used, the limited spray liquid will be used up in a short period of time, which cannot cope with the thermal runaway trig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62C3/16A62C3/07A62C37/00A62C37/36A62C31/00
CPCA62C3/16A62C3/07A62C37/04A62C37/36A62C31/00H01M2200/00H01M2220/20Y02E60/10
Inventor 赵建雄郭盛昌刘晨帆
Owner CHONGQING JINKANG POWER NEW ENERGY CO LTD
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