CN214374209U

CN214374209U - Thermal runaway early warning sensor

Info

Publication number: CN214374209U
Application number: CN202023121191.7U
Authority: CN
Inventors: 徐勤; 朱玉斌; 孙路
Original assignee: Anhui Gvb Renewable Energy Technology Co ltd
Current assignee: Anhui Gvb Renewable Energy Technology Co ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-10-08
Anticipated expiration: 2030-12-21

Abstract

The utility model discloses a thermal runaway early warning sensor, the utility model discloses in: the integrated optical module is in communication connection with the CPU module through the SPI; the power supply module supplies power to the CPU module and the integrated optical module; the integrated optical module comprises a light-emitting module and a sensing module; a request pin of the CPU module receives high and low level signals transmitted by the BMS; the output end of the CPU module transmits a Wake-up signal to the BMS; the CPU module also outputs PWM signals to the BMS; and the CPU module switches the working mode according to the signal received by the request pin and the data collected by the integrated optical module. The utility model discloses a set up integrated optical module monitoring smog concentration, can effectively detect the change of aerosol concentration in the battery package fast to through the data of integrated optical module monitoring and BMS's request signal, switch over the mode of operation of sensor, through setting up the low-power mode, reduce the consumption of sensor, and through the CPU module and the integrated optical module that adopt the integrated form, the structure is miniaturized, convenient to install and use.

Description

Thermal runaway early warning sensor

Technical Field

The utility model belongs to the technical field of the sensor, especially, relate to a thermal runaway early warning sensor.

Background

Under the current large background of energy conservation and emission reduction, an important component in sustainable economy, namely the electric automobile, gradually enters our lives. The battery pack is used as a core component of a vehicle, which is concerned about vehicle experience and vehicle use safety, in recent years, spontaneous combustion accidents of new energy vehicles caused by thermal runaway of the battery pack occur in domestic and foreign automobile brands, and attention is paid to the safety of the battery. Thermal runaway refers to a battery burning accident caused by the temperature of a power battery rising to a certain value. Thermal runaway is a main cause of a combustion accident of a new energy automobile, and a large amount of heat is accumulated in a battery due to the fact that the heat generation rate in the battery is far higher than the heat dissipation rate, so that ignition or explosion of a single battery is caused. Thermal runaway of the single battery can be diffused to the whole battery system, and fire or explosion accidents of the whole battery system and even the whole vehicle are caused. The early warning of the thermal runaway early warning sensor can assuredly inform passengers in the vehicle before the thermal runaway of the whole vehicle, so that casualties are avoided, and property loss caused by accidents can be reduced as much as possible.

At present, the method for judging thermal runaway includes three main categories of abnormal cell temperature, abnormal voltage and abnormal gas pressure (or gas composition): temperature is too high: if there is a certain temperature value greater than 60 c and for a certain time (recommended time 3 seconds). ② the temperature rises too fast: the temperature rise of the highest temperature value within a certain time (recommended 1 second) is more than or equal to a certain value (recommended 5 ℃). Low voltage: the voltage value is maintained at a constant value (2V recommended) or less for a constant time (2 seconds recommended). Pressure drop is too fast: the lowest voltage drops by a certain value (recommended 1V) within a certain time (recommended 2 seconds). Air pressure fluctuation: both barometric pressure sensor measurements are at a barometric overpressure of greater than 120KPa over a 5 second time interval.

However, the existing thermal runaway judgment method has the following defects: the characteristic of the temperature of the battery core is that when the battery core temperature sensor is arranged, arrangement points are limited, and generally, the temperature of a single battery core has a continuous and rapid rising process before thermal runaway occurs and is divided into two sections. A first stage: second stage from room temperature up to T1 (normally this stage is relatively smooth): the temperature rises sharply, and at this time, the NTC temperature sensor commonly used by us cannot sense the temperature quickly, and the temperature can be more than 400 ℃ or even higher. And secondly, the voltage of the single battery voltage signal battery is basically maintained at the platform voltage before the thermal runaway occurs, and the voltage of the battery core is reduced after the thermal runaway occurs. Because the electric core can directly burn and destroy the detected sampling line at this time, the section is changed into an invalid value very quickly, and the voltage is characterized by no signal very quickly. The analysis of battery package internal gas pressure signal is now more practice at thermal runaway in-process, uses the baroceptor of placing in the battery package to detect, and normal atmospheric pressure is 101KPa, after a large amount of gas of release after the battery cell takes place the thermal runaway, the atmospheric pressure of perception can rise in the whole package, generally can reach more than 120KPa, after triggering the relief valve of battery package, atmospheric pressure can resume. When the subsequent second monomer thermal runaway occurs, the gas pressure will rise again.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a thermal runaway early warning sensor through integrated optical module monitoring smog concentration, can effectively detect the change of aerosol concentration in the battery package fast to through the data of integrated optical module monitoring and BMS's request signal, switch over the mode of sensor, through setting up the low-power mode, reduce the consumption of sensor, and through the CPU module and the integrated optical module that adopt the integrated form, the structure is miniaturized, is convenient for install and use.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

the utility model relates to a thermal runaway early warning sensor, the sensor body includes CPU module, power module and integrated optical module, integrated optical module and CPU module carry out information interaction through SPI communication; the CPU module is connected with the BMS; the power supply module supplies power to the CPU module and the integrated optical module; the integrated optical module comprises a light-emitting module and an induction module; the integrated optical module is used for sensing smoke concentration data; a request pin of the CPU module receives high and low level signals transmitted by the BMS; the output end of the CPU module transmits a Wake-up signal to the BMS; the CPU module also outputs a PWM signal to the BMS; when the integrated optical module monitors that the smoke concentration data exceeds a set threshold, the CPU module sends a Wake-up signal to the BMS.

The working modes of the CPU module comprise a low power consumption mode and a normal mode; the CPU module does not have PWM output in a low power consumption mode; the CPU module outputs continuous PWM signals in a normal mode, and the integrated optical module continuously monitors smoke concentration data.

Further, the CPU module includes an RTC module, and the RTC module is configured to provide a standard clock signal, and is configured to start power output at regular time and switch a working mode of the CPU module.

Further, the input end of the power supply module is connected with a positive electrode KL30 and a negative electrode KL31 of the vehicle-mounted battery; the power supply module provides 3.3V direct current for the CPU module; the power supply module provides 1.8V direct current for the integrated optical module; the CPU module is also connected with the power supply module through a GPIO interface; the power module is connected with the integrated optical module through a low-dropout linear regulator.

Further, the monitoring period and the sleep time of the integrated optical module in the low power consumption mode are both 12S; i.e., the integrated optical module is operated 12S and then hibernated 12S, and then cycled.

The utility model discloses following beneficial effect has:

the utility model discloses a set up integrated optical module monitoring smog concentration, can effectively detect the change of aerosol concentration in the battery package fast to through the data of integrated optical module monitoring and BMS's request signal, switch over the mode of operation of sensor, through setting up the low-power mode, reduce the consumption of sensor, and through the CPU module and the integrated optical module that adopt the integrated form, the structure is miniaturized, convenient to install and use.

Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a system diagram of a thermal runaway warning sensor;

fig. 2 is a flowchart of the operation of a thermal runaway early warning sensor.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1, the present invention relates to a thermal runaway early warning sensor, which comprises a sensor body including a CPU module, a power module and an integrated optical module, wherein the integrated optical module and the CPU module perform information interaction through SPI communication; the CPU module is connected with the BMS; the BMS (battery management system) is a set of control system for protecting the use safety of the power battery and constantly monitors the use state of the battery;

the power supply module supplies power to the CPU module and the integrated optical module; the input end of the power supply module is connected with a positive electrode KL30 and a negative electrode KL31 of the vehicle-mounted battery; the power supply module provides 3.3V direct current for the CPU module; the power supply module supplies 1.8V direct current to the integrated optical module; the CPU module is also connected with the power supply module through a GPIO interface; the power module is connected with the integrated optical module through a low-dropout linear regulator;

the CPU module comprises an RTC module which is used for providing a standard clock signal; a request pin of the CPU module receives high and low level signals transmitted by the BMS; the output end of the CPU module transmits a Wake-up signal to the BMS; the CPU module also outputs PWM signals to the BMS;

the integrated optical module comprises a light-emitting module and an induction module; the integrated optical module is used for sensing smoke concentration data; when the integrated optical module monitors that the smoke concentration data exceeds a set threshold, the CPU module sends a Wake-up signal to the BMS;

the working modes of the CPU module comprise a low power consumption mode and a normal mode; the CPU module does not have PWM output in a low power consumption mode; the CPU module will output a continuous PWM signal in normal mode and the integrated optics module will continuously monitor the smoke concentration data.

As shown in fig. 2, the CPU module switches the operating mode according to the signal received by the request pin and the data collected by the integrated optical module;

when the voltage on the request pin is low level and the integrated optical module monitors that the smoke concentration is lower than a set threshold value, the sensor body works in a low power consumption mode; the CPU module does not have PWM output in a low-power consumption working mode; the monitoring period and the sleep time of the integrated optical module in the low power consumption mode are both 12S, namely the integrated optical module works for 12S and then sleeps for 12S, and then the operation is circulated;

when the voltage on the request pin is at a high level, the sensor body works in a normal mode, the CPU module outputs a continuous PWM signal in the normal mode, and the integrated optical module continuously monitors smoke concentration data.

In the description herein, references to the description of "one embodiment," "an example," "a specific example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, to thereby enable others skilled in the art to best understand the invention for and utilize the invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. The utility model provides a thermal runaway early warning sensor, sensor body include CPU module, power module and integrated optical module, its characterized in that: the integrated optical module and the CPU module carry out information interaction through SPI communication; the CPU module is connected with the BMS;

the power supply module supplies power to the CPU module and the integrated optical module; the integrated optical module comprises a light-emitting module and an induction module; the integrated optical module is used for sensing smoke concentration data;

a request pin of the CPU module receives high and low level signals transmitted by the BMS; the output end of the CPU module transmits a Wake-up signal to the BMS; the CPU module also outputs a PWM signal to the BMS;

the working modes of the CPU module comprise a low power consumption mode and a normal mode.

2. The warning sensor of claim 1, wherein the CPU module comprises an RTC module, and the RTC module is configured to provide a standard clock signal.

3. The sensor according to claim 1, wherein the input terminal of the power module is connected to the positive electrode KL30 and the negative electrode KL31 of the vehicle-mounted battery; the power supply module provides 3.3V direct current for the CPU module; the power supply module provides 1.8V direct current for the integrated optical module;

the CPU module is also connected with the power supply module through a GPIO interface; the power module is connected with the integrated optical module through a low-dropout linear regulator.

4. The warning sensor for thermal runaway of claim 1, wherein the monitoring period and the sleep time of the integrated optical module in the low power consumption mode are both 12S.