阅读说明：本技术 一种电池模块预警方法和系统及火灾探测装置 (Battery module early warning method and system and fire detection device ) 是由 刘皓 杨凯 赖铱麟 张明杰 高飞 范茂松 耿萌萌 渠展展 于 2020-12-15 设计创作，主要内容包括：本发明公开了一种电池模块预警方法和系统及火灾探测装置,包括：测量电池模块热特性参数,提取电池模块热特性特征值,将其代入电池模块热特征参数数据库进行一级参数比对；经过一级参数比对后,若对比结果中具有非正常温度分布的电池模块,则对具有非正常温度分布的电池模块的热特性特征值代入电池模块热特性特征参数数据库进行二级参数比对；否重新进行一级参数比对；经过二级参数比对后,若对比结果中具有短期内具有热失控风险的电池模块,则调整传感器的采样频率至0.5Hz,否重新进行二级参数比对。本发明对锂离子电池进行温度及可燃气体实时探测,判定锂电池出现安全事故的可能性,判断锂电池热失控风险,制定探测策略,提升火灾探测精度。(The invention discloses a battery module early warning method and system and a fire detection device, wherein the method comprises the following steps: measuring thermal characteristic parameters of the battery module, extracting thermal characteristic values of the battery module, and substituting the thermal characteristic values into a thermal characteristic parameter database of the battery module to perform primary parameter comparison; after the first-level parameter comparison, if the battery module with abnormal temperature distribution exists in the comparison result, substituting the thermal characteristic feature value of the battery module with abnormal temperature distribution into a thermal characteristic feature parameter database of the battery module to perform second-level parameter comparison; if not, the first-level parameter comparison is carried out again; after the second-stage parameter comparison, if the comparison result has a battery module with a thermal runaway risk in a short period, adjusting the sampling frequency of the sensor to 0.5Hz, and if not, performing the second-stage parameter comparison again. The invention detects the temperature and combustible gas of the lithium ion battery in real time, judges the possibility of safety accidents of the lithium ion battery, judges the thermal runaway risk of the lithium ion battery, formulates a detection strategy and improves the fire detection precision.)

1. A battery module early warning method is characterized by comprising the following steps:

measuring thermal characteristic parameters of the battery module, extracting thermal characteristic values of the battery module, and substituting the thermal characteristic values into a thermal characteristic parameter database of the battery module to perform primary parameter comparison;

if the battery module with abnormal temperature distribution exists in the primary parameter comparison result, substituting the thermal characteristic feature value of the battery module with abnormal temperature distribution into a thermal characteristic feature parameter database of the battery module to perform secondary parameter comparison; otherwise, the first-level parameter comparison is carried out again;

if the secondary parameter comparison result contains a battery module with a thermal runaway risk in a short period, alarming and adjusting the sampling frequency of the sensor; otherwise, the second-level parameter comparison is carried out again.

2. The battery module early warning method according to claim 1, wherein the battery module thermal characteristic parameter database is established by the following method:

establishing a battery module thermal runaway model, simulating to obtain a temperature field in the thermal runaway process of the battery module, analyzing characteristic parameters of the temperature field, and extracting a thermal runaway thermal characteristic value of the battery module;

performing thermal simulation on the standard working condition of the battery module by using a thermal runaway model of the battery module to obtain a temperature field of the standard working condition of the battery module, and extracting a thermal characteristic value of the standard working condition of the battery module;

and establishing a thermal characteristic parameter database of the battery module by using the thermal runaway thermal characteristic value of the battery module and the thermal characteristic value of the standard working condition of the battery module.

3. The battery module early warning method according to claim 2, wherein the battery module thermal runaway model is established by the following method:

the thermal model of the battery module is constructed through a lithium ion battery Neman P2D model, a Circuit network model, an MSMD model and a thermal abuse model, the thermal runaway process simulation of the battery module is realized, and the thermal characteristic value of the battery module in the thermal runaway process is obtained.

4. The battery module early warning method according to claim 1, wherein the sensors in the step 5 comprise a temperature sensor, a smoke sensor and a combustible gas sensor.

5. The early warning method for the battery module according to claim 1 or 4, wherein in the step 5, when the second-level parameter comparison is performed, if the concentration of the combustible gas in the space where the battery module is located is greater than 100ppm, the sampling frequency of the sensor is adjusted to 0.5 Hz.

6. A battery module early warning system, comprising:

the abnormal temperature battery module screening unit is used for measuring the thermal characteristic parameters of the battery module, extracting the thermal characteristic value of the battery module, and substituting the thermal characteristic value into a thermal characteristic parameter database of the battery module to carry out primary parameter comparison;

the battery module screening unit with the thermal runaway risk in a short term is used for substituting the thermal characteristic value of the battery module with abnormal temperature distribution in the primary parameter comparison result into a battery module thermal characteristic parameter database to perform secondary parameter comparison; if the secondary parameter comparison result contains a battery module with a thermal runaway risk in a short period, alarming and adjusting the sampling frequency of the sensor; otherwise, the second-level parameter comparison is carried out again.

7. A battery module early warning system, comprising:

a processor adapted to implement instructions; and

a storage device adapted to store a plurality of instructions, the instructions adapted to be loaded and executed by a processor to:

measuring thermal characteristic parameters of the battery module, extracting thermal characteristic values of the battery module, and substituting the thermal characteristic values into a thermal characteristic parameter database of the battery module to perform primary parameter comparison;

if the battery module with abnormal temperature distribution exists in the primary parameter comparison result, substituting the thermal characteristic feature value of the battery module with abnormal temperature distribution into a thermal characteristic feature parameter database of the battery module to perform secondary parameter comparison; otherwise, the first-level parameter comparison is carried out again;

if the secondary parameter comparison result contains a battery module with a thermal runaway risk in a short period, alarming and adjusting the sampling frequency of the sensor; otherwise, the second-level parameter comparison is carried out again.

8. A computer readable storage device having stored therein a plurality of instructions adapted to be loaded and executed by a processor:

measuring thermal characteristic parameters of the battery module, extracting thermal characteristic values of the battery module, and substituting the thermal characteristic values into a thermal characteristic parameter database of the battery module to perform primary parameter comparison;

if the battery module with abnormal temperature distribution exists in the primary parameter comparison result, substituting the thermal characteristic feature value of the battery module with abnormal temperature distribution into a thermal characteristic feature parameter database of the battery module to perform secondary parameter comparison; otherwise, the first-level parameter comparison is carried out again;

if the secondary parameter comparison result contains a battery module with a thermal runaway risk in a short period, alarming and adjusting the sampling frequency of the sensor; otherwise, the second-level parameter comparison is carried out again.

9. A fire detection device, comprising:

the temperature sensor is arranged on the central part of the battery and the battery negative pole;

the smoke sensor is arranged in the battery box;

the combustible gas sensor is arranged in the battery box;

and a host including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor employing a battery module warning method when executing the computer program, the method comprising:

measuring thermal characteristic parameters of the battery module, extracting thermal characteristic values of the battery module, and substituting the thermal characteristic values into a thermal characteristic parameter database of the battery module to perform primary parameter comparison;

if the battery module with abnormal temperature distribution exists in the primary parameter comparison result, substituting the thermal characteristic feature value of the battery module with abnormal temperature distribution into a thermal characteristic feature parameter database of the battery module to perform secondary parameter comparison; otherwise, the first-level parameter comparison is carried out again;

if the secondary parameter comparison result contains a battery module with a thermal runaway risk in a short period, alarming and adjusting the sampling frequency of the sensor; otherwise, the second-level parameter comparison is carried out again.

Technical Field

The invention belongs to the technical field of lithium ion batteries, and relates to a battery module early warning method and system and a fire detection device.

Background

Since the 70 s of the last century, lithium ion batteries have been developed rapidly, and have been widely used in many fields such as digital products and home appliances in consideration of their advantages such as high specific energy, high output voltage, and long cycle life. With the increasing severity of energy problems in the last decade, lithium ion batteries have been rapidly developed in electric vehicles and electrochemical energy storage.

However, the lithium ion battery has a safety hidden trouble which cannot be ignored, and the safety problem of the lithium ion battery is more acute along with the improvement of parameters such as the energy density of the lithium ion battery. An accurate fire detection technology and an effective lithium ion battery fire extinguishing technology are important ways for reducing the fire loss of the battery.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a battery module early warning method and system and a fire detection device.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

a battery module early warning method comprises the following steps:

measuring thermal characteristic parameters of the battery module, extracting thermal characteristic values of the battery module, and substituting the thermal characteristic values into a thermal characteristic parameter database of the battery module to perform primary parameter comparison;

after the first-level parameter comparison, if the battery module with abnormal temperature distribution exists in the comparison result, substituting the thermal characteristic feature value of the battery module with abnormal temperature distribution into a thermal characteristic feature parameter database of the battery module to perform second-level parameter comparison; if not, the first-level parameter comparison is carried out again;

after the second-stage parameter comparison, if the comparison result has a battery module with a thermal runaway risk in a short period, adjusting the sampling frequency of the sensor to 0.5Hz, and if not, performing the second-stage parameter comparison again.

A battery module early warning system, comprising:

the abnormal temperature battery module screening unit is used for substituting the thermal characteristic value of the battery module into a battery module thermal characteristic parameter database to carry out primary parameter comparison and screening out the battery modules with abnormal temperature distribution;

the battery module screening unit with the thermal runaway risk in a short period is used for substituting the thermal characteristic value of the battery module with abnormal temperature distribution into a battery module thermal characteristic parameter database to carry out secondary parameter comparison, and screening out the battery module with the thermal runaway risk in the short period; and sends an instruction to the temperature sensor to adjust the sampling frequency of the sensor to 0.5 Hz.

A battery module early warning system, comprising:

a processor adapted to implement instructions; and

a storage device adapted to store a plurality of instructions, the instructions adapted to be loaded and executed by a processor to:

measuring thermal characteristic parameters of the battery module, extracting thermal characteristic values of the battery module, and substituting the thermal characteristic values into a thermal characteristic parameter database of the battery module to perform primary parameter comparison;

after the first-level parameter comparison, if the battery module with abnormal temperature distribution exists in the comparison result, substituting the thermal characteristic feature value of the battery module with abnormal temperature distribution into a thermal characteristic feature parameter database of the battery module to perform second-level parameter comparison; if not, the first-level parameter comparison is carried out again;

after the second-stage parameter comparison, if the comparison result has a battery module with a thermal runaway risk in a short period, adjusting the sampling frequency of the sensor to 0.5Hz, and if not, performing the second-stage parameter comparison again.

A computer readable storage device having stored therein a plurality of instructions adapted to be loaded and executed by a processor:

measuring thermal characteristic parameters of the battery module, extracting thermal characteristic values of the battery module, and substituting the thermal characteristic values into a thermal characteristic parameter database of the battery module to perform primary parameter comparison;

after the first-level parameter comparison, if the battery module with abnormal temperature distribution exists in the comparison result, substituting the thermal characteristic feature value of the battery module with abnormal temperature distribution into a thermal characteristic feature parameter database of the battery module to perform second-level parameter comparison; if not, the first-level parameter comparison is carried out again;

after the second-stage parameter comparison, if the comparison result has a battery module with a thermal runaway risk in a short period, adjusting the sampling frequency of the sensor to 0.5Hz, and if not, performing the second-stage parameter comparison again.

A fire detection device comprising:

the temperature sensor is arranged on the central part of the battery and the battery negative pole;

the smoke sensor is arranged in the battery box;

the combustible gas sensor is arranged in the battery box;

and a host including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor employing a battery module warning method when executing the computer program, the method comprising:

measuring thermal characteristic parameters of the battery module, extracting thermal characteristic values of the battery module, and substituting the thermal characteristic values into a thermal characteristic parameter database of the battery module to perform primary parameter comparison;

after the first-level parameter comparison, if the battery module with abnormal temperature distribution exists in the comparison result, substituting the thermal characteristic feature value of the battery module with abnormal temperature distribution into a thermal characteristic feature parameter database of the battery module to perform second-level parameter comparison; if not, the first-level parameter comparison is carried out again;

after the second-stage parameter comparison, if the comparison result has a battery module with a thermal runaway risk in a short period, adjusting the sampling frequency of the sensor to 0.5Hz, and if not, performing the second-stage parameter comparison again.

Compared with the prior art, the invention has the following beneficial effects:

the early warning method of the battery module substitutes the thermal characteristic value of the measured battery module into the thermal characteristic parameter database of the battery module to carry out primary parameter comparison. If the battery module with abnormal temperature distribution exists in the primary parameter comparison result, substituting the thermal characteristic feature value of the battery module with abnormal temperature distribution into a thermal characteristic feature parameter database of the battery module to perform secondary parameter comparison; otherwise, the first-level parameter comparison is carried out again; if the secondary parameter comparison result contains a battery module with a thermal runaway risk in a short period, alarming and adjusting the sampling frequency of the sensor; otherwise, the second-level parameter comparison is carried out again. According to the invention, the safety levels of the battery modules are secondarily divided through numerical comparison, so that the battery modules with the thermal runaway risk in a short period are screened out, an alarm is given, and the use safety of the battery module is improved. The invention is easy to realize in engineering implementation, has higher application value and has wide application prospect in the fields of electric automobiles, electrochemical energy storage and the like.

Drawings

In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a flowchart of a battery module early warning method according to an embodiment of the present invention;

fig. 2 is a logic diagram of an early warning according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1, an embodiment of the present invention discloses a battery module early warning method, which mainly aims at a battery module, and includes the following steps:

step 1, firstly, establishing a thermal characteristic parameter database of the battery module

The method comprises the steps of obtaining a temperature field in the thermal runaway process of the battery module through simulation by establishing a thermal runaway model of the battery module, analyzing characteristic parameters of the temperature field, and extracting a thermal runaway characteristic value of the battery module.

And performing thermal simulation on the standard working condition of the battery module by using the thermal model of the battery module to obtain a temperature field of the standard working condition of the battery module, and extracting a thermal characteristic value of the standard working condition of the lithium ion battery.

And establishing a thermal characteristic parameter database of the battery module by using the thermal runaway thermal characteristic value of the battery module and the thermal characteristic value of the standard working condition of the lithium ion battery.

Step 2, screening the battery modules with the thermal runaway risk in a short period

The method comprises the steps of extracting a thermal characteristic value of a battery module by measuring a thermal characteristic parameter of the battery module, substituting the thermal characteristic value into a database, firstly, carrying out primary parameter comparison, screening out a normal temperature distribution module and an abnormal temperature distribution module, and classifying the normal temperature distribution module into a risk-free battery module;

the thermal characteristic parameters of the battery module are obtained according to the following method:

1. galvanic measurement

And setting a temperature measuring point on the surface of the battery by using a thermocouple, collecting the temperature of the battery by using collection equipment, and analyzing thermal characteristic parameters of the battery module. Thermocouple arrangement mode: a thermocouple is arranged at the central part of the side surface of each battery;

2. infrared imaging measurement

And acquiring the temperature of the battery module by using infrared imaging equipment, analyzing the temperature distribution characteristics of the module, and comparing the parameters of the next step according to the characteristic values. Arrangement of the infrared imaging equipment: disposed at an angle of 45 deg. above the battery module.

And performing secondary parameter comparison on the abnormal temperature distribution module, and screening out a module which needs to be focused on and a module with a thermal runaway risk in a short period. Through the numerical comparison of 2 levels, the safety levels of the battery modules are divided into risk-free battery modules, battery modules needing to be focused on and battery modules with thermal runaway risks in a short period.

When the battery module has a thermal runaway risk in a short period, the sampling frequency of the temperature sensor is increased from 0.03Hz to 0.5Hz, so that the fire detection precision is improved, and a fire is found quickly.

The embodiment of the invention also discloses a fire detection device which comprises a temperature sensor, a smoke sensor, a combustible gas sensor and a host. The temperature sensor measures the temperature of the battery, the host machine grades the battery module through the early warning method of the battery module, the combustible gas sensor measures the concentration of combustible gas (the concentration of CO is measured in the embodiment) in the space, and when the concentration of the combustible gas is larger than 100ppm, the sampling frequency of the sensor of the fire detection device is increased from 0.03Hz to 0.5 Hz.

The invention provides a battery module early warning system. This battery module early warning system includes: a processor, a memory, and a computer program, such as a battery module warning program, stored in the memory and executable on the processor. The processor, when executing the computer program, implements the steps in the above-described battery module early warning method embodiment, such as the steps shown in fig. 1. Alternatively, the processor executes the computer program to implement the functions of the modules/units in the above-mentioned device embodiments, such as screening of abnormal temperature battery modules, and screening of battery modules with a risk of thermal runaway in a short period of time.

The early warning logic of the embodiment is as follows:

as shown in fig. 2, when the battery module has been determined to be "at risk of thermal runaway for a short period", three alarm signals are sent simultaneously: (1) the early warning device sends an alarm signal to the monitoring system in a TCP communication mode, and the monitoring system informs an operator that the system has serious potential danger. (2) The early warning equipment sends an alarm signal to a battery management system in a CAN communication mode, and the battery management system cuts off a circuit between the battery and the converter after receiving the signal; (3) the early warning equipment sends the early warning information to the converter in an RS-485 communication mode

The computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention.

The battery module early warning system can be a desktop computer, a notebook computer, a palm computer, a cloud server and other computing equipment. The battery module warning system may include, but is not limited to, a processor, and a memory.

The processor may be a Central Processing Unit (CPU), other general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, etc.

The memory may be used to store the computer program and/or module, and the processor may implement various functions of the battery module warning system by operating or executing the computer program and/or module stored in the memory and calling data stored in the memory.

The modules/units integrated with the battery module early warning system may be stored in a computer-readable storage medium if they are implemented in the form of software functional units and sold or used as separate products. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer memory, Read-only memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, etc. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.