阅读说明：本技术 一种电池热失控检测系统和方法 (Battery thermal runaway detection system and method ) 是由 张广平 倪丽萍 孙亚洲 劳力 周鹏 于 2021-09-17 设计创作，主要内容包括：本发明实施例提出一种电池热失控检测系统和方法,涉及电池温度检测领域。该电池热失控检测系统包括：数据处理模块和温度数据采集模块,温度数据采集模块包括多个热电偶,多个热电偶中的至少两个热电偶的温度采集端与数据处理模块电连接,多个热电偶中的至少两个热电偶的温度测量端电连接,每个热电偶的温度测量端靠近电池模组中的防爆阀,多个热电偶与数据处理模块构成至少一个温度检测回路；数据处理模块用于根据温度采集端的检测信号,计算温度信息,在温度信息达到预设值时,判定电池模组发生热失控。利用多个热电偶与数据处理模块构成的温度检测回路实现对电池模组温度的实时检测,从而提高对电池模组热失控的检测及时率。(The embodiment of the invention provides a battery thermal runaway detection system and method, and relates to the field of battery temperature detection. This battery thermal runaway detection system includes: the temperature data acquisition module comprises a plurality of thermocouples, the temperature acquisition ends of at least two thermocouples in the plurality of thermocouples are electrically connected with the data processing module, the temperature measurement ends of at least two thermocouples in the plurality of thermocouples are electrically connected, the temperature measurement end of each thermocouple is close to an explosion-proof valve in the battery module, and the plurality of thermocouples and the data processing module form at least one temperature detection loop; the data processing module is used for calculating temperature information according to the detection signal of the temperature acquisition end, and judging that the battery module is out of control due to heat when the temperature information reaches a preset value. The real-time detection of the temperature of the battery module is realized by utilizing the temperature detection loop formed by the thermocouples and the data processing module, so that the detection timeliness rate of thermal runaway of the battery module is improved.)

1. The battery thermal runaway detection system is characterized by comprising a data processing module and a temperature data acquisition module, wherein the temperature data acquisition module comprises a plurality of thermocouples, the temperature acquisition ends of at least two thermocouples in the plurality of thermocouples are electrically connected with the data processing module, the temperature measurement ends of at least two thermocouples in the plurality of thermocouples are electrically connected, the temperature measurement end of each thermocouple is close to an explosion-proof valve in a battery module, and the plurality of thermocouples and the data processing module form at least one temperature detection loop;

the data processing module is used for calculating temperature information according to the detection signal of the temperature acquisition end;

the data processing module is further used for judging that the battery module is out of thermal runaway when the temperature information reaches a preset value.

2. The battery thermal runaway detection system of claim 1, wherein the temperature acquisition end of each thermocouple of the plurality of thermocouples is electrically connected to the data processing module, the plurality of thermocouples comprises at least one positive thermocouple and at least one negative thermocouple, the temperature measurement end of the positive thermocouple is electrically connected to the temperature measurement end of the negative thermocouple in a one-to-one correspondence, and each positive thermocouple, the negative thermocouple electrically connected to the positive thermocouple, and the data processing module form one temperature detection loop.

3. The system of claim 2, wherein the temperature measuring terminals of the positive thermocouple and the negative thermocouple in the temperature detection circuit are electrically connected by a lead.

4. The battery thermal runaway detection system of claim 1, wherein the plurality of thermocouples comprises a first thermocouple, a second thermocouple, and a third thermocouple, the first thermocouple and the second thermocouple having different polarities, the second thermocouple and the third thermocouple having the same polarity; the first thermocouple, the second thermocouple and the third thermocouple respectively comprise a first end and a second end, the first end of the first thermocouple, the first end of the second thermocouple and the first end of the third thermocouple are electrically connected with each other, and the second end of the first thermocouple, the second end of the second thermocouple and the second end of the third thermocouple are electrically connected with the data processing module;

the first end is the temperature measuring end, the second end of the first thermocouple and the second end of the third thermocouple are the temperature collecting ends, and the first thermocouple, the second thermocouple, the third thermocouple and the data processing module form the temperature detection loop.

5. The battery thermal runaway detection system of claim 4, wherein the first end of the first thermocouple, the first end of the second thermocouple, and the first end of the third thermocouple are all connected to the same wire.

6. The battery thermal runaway detection system of claim 1, wherein the plurality of thermocouples comprises at least one positive thermocouple and at least one negative thermocouple, wherein positive thermocouples of the plurality of thermocouples are alternately electrically connected to negative thermocouples, and wherein a first thermocouple of the plurality of thermocouples is of a different polarity than a last thermocouple of the plurality of thermocouples;

the end, which is not electrically connected with the residual heat thermocouple, of the first thermocouple and the last thermocouple is the temperature acquisition end, and the temperature acquisition ends of the first thermocouple and the last thermocouple are electrically connected with the data processing module;

the connection point of the positive thermocouple and the negative thermocouple in the plurality of thermocouples is the temperature measuring end.

7. The system of claim 1, wherein the plurality of thermocouples form a plurality of thermocouple groups, each thermocouple group comprising a positive thermocouple and a negative thermocouple, the positive thermocouple being electrically connected to the negative thermocouple; the thermocouple groups are electrically connected in sequence through leads, and the polarities of two thermocouples connected by the leads between any two adjacent thermocouple groups are different;

wherein, the connection point of the positive thermocouple and the negative thermocouple in each thermocouple group is the temperature measuring end; one end of the first thermocouple group and the last thermocouple group in the plurality of thermocouple groups, which is not electrically connected with the residual heat thermocouple group, is the temperature acquisition end, and the temperature acquisition ends of the first thermocouple group and the last thermocouple group are electrically connected with the data processing module; the thermocouple groups and the data processing module form the temperature detection loop.

8. The battery thermal runaway detection system of claim 1, wherein the data processing module comprises a signal transceiver and a battery management system, the temperature acquisition terminal is electrically connected to the signal transceiver, and the signal transceiver is electrically connected to the battery management system;

the signal transceiver is used for calculating temperature information according to the detection signal of the temperature acquisition end and sending the temperature information to the battery management system;

and the battery management system is used for judging that the battery module is out of thermal runaway when the temperature information reaches a preset value.

9. The battery thermal runaway detection system of claim 8,

the battery management system is also used for executing preset abnormal processing operation under the condition that the battery module is judged to generate thermal runaway.

10. A battery thermal runaway detection method applied to the battery thermal runaway detection system of claim 1, the method comprising:

the data processing module acquires a detection signal of the temperature acquisition end;

the data processing module calculates temperature information according to the detection signal;

and the data processing module judges that the battery module is out of thermal runaway when the temperature information reaches a preset value.

Technical Field

The invention relates to the field of battery temperature detection, in particular to a battery thermal runaway detection system and method.

Background

At present, sensors such as aerosol, smoke, hydrogen and gas pressure are generally used for performing thermal runaway on a battery system, and when thermal runaway occurs in the battery system, a runaway battery can release smoke, hydrogen and alkane gases, and at the moment, the gases can be detected by the sensors and give an alarm.

However, when the above-mentioned sensors are used, the detection of the corresponding components is realized by using a chip, the principle is complex, and the reliability needs to be verified. On the other hand, if the temperature sensing device is used for detecting the thermal runaway condition of the battery with smaller capacity, the temperature sensing device cannot timely detect the temperature change condition of the battery due to the fact that the amount of released gas is small, and therefore whether the thermal runaway of the battery occurs or not cannot be timely judged.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a system and a method for detecting thermal runaway of a battery, so as to solve the problem that it is impossible to detect temperature changes of a battery module and determine whether thermal runaway of the battery module occurs in time in the prior art.

In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:

in a first aspect, the invention provides a battery thermal runaway detection system, which comprises a data processing module and a temperature data acquisition module, wherein the temperature data acquisition module comprises a plurality of thermocouples, the temperature acquisition ends of at least two thermocouples in the plurality of thermocouples are electrically connected with the data processing module, the temperature measurement ends of at least two thermocouples in the plurality of thermocouples are electrically connected, the temperature measurement end of each thermocouple is close to an explosion-proof valve in a battery module, and the plurality of thermocouples and the data processing module form at least one temperature detection loop;

the data processing module is used for calculating temperature information according to the detection signal of the temperature acquisition end;

the data processing module is further used for judging that the battery module is out of thermal runaway when the temperature information reaches a preset value.

In an optional embodiment, the temperature acquisition end of each of the plurality of thermocouples is electrically connected to the data processing module, the plurality of thermocouples includes at least one positive thermocouple and at least one negative thermocouple, the temperature measurement end of the positive thermocouple is electrically connected to the temperature measurement end of the negative thermocouple in a one-to-one correspondence, and each positive thermocouple, the negative thermocouple electrically connected to the positive thermocouple, and the data processing module constitute one temperature detection loop.

In an alternative embodiment, the temperature measuring ends of the positive thermocouple and the negative thermocouple in the temperature detection loop are electrically connected through a lead.

In an alternative embodiment, the plurality of thermocouples comprises a first thermocouple, a second thermocouple, and a third thermocouple, the first thermocouple and the second thermocouple having different polarities, and the second thermocouple and the third thermocouple having the same polarity; the first thermocouple, the second thermocouple and the third thermocouple respectively comprise a first end and a second end, the first end of the first thermocouple, the first end of the second thermocouple and the first end of the third thermocouple are electrically connected with each other, and the second end of the first thermocouple, the second end of the second thermocouple and the second end of the third thermocouple are electrically connected with the data processing module;

the first end is the temperature measuring end, the second end of the first thermocouple and the second end of the third thermocouple are the temperature collecting ends, and the first thermocouple, the second thermocouple, the third thermocouple and the data processing module form the temperature detection loop.

In an alternative embodiment, the first end of the first thermocouple, the first end of the second thermocouple, and the first end of the third thermocouple are all connected to the same wire.

In an alternative embodiment, the plurality of thermocouples comprises at least one positive thermocouple and at least one negative thermocouple, the positive thermocouples of the plurality of thermocouples are alternately electrically connected with the negative thermocouples, and the first thermocouple of the plurality of thermocouples is different in polarity from the last thermocouple;

the end, which is not electrically connected with the residual heat thermocouple, of the first thermocouple and the last thermocouple is the temperature acquisition end, and the temperature acquisition ends of the first thermocouple and the last thermocouple are electrically connected with the data processing module;

the connection point of the positive thermocouple and the negative thermocouple in the plurality of thermocouples is the temperature measuring end.

In an alternative embodiment, the plurality of thermocouples form a plurality of thermocouple groups, each thermocouple group comprises a positive thermocouple and a negative thermocouple, and the positive thermocouple is electrically connected with the negative thermocouple; the thermocouple groups are electrically connected in sequence through leads, and the polarities of two thermocouples connected by the leads between any two adjacent thermocouple groups are different;

wherein, the connection point of the positive thermocouple and the negative thermocouple in each thermocouple group is the temperature measuring end; one end of the first thermocouple group and the last thermocouple group in the plurality of thermocouple groups, which is not electrically connected with the residual heat thermocouple group, is the temperature acquisition end, and the temperature acquisition ends of the first thermocouple group and the last thermocouple group are electrically connected with the data processing module; the thermocouple groups and the data processing module form the temperature detection loop.

In an optional embodiment, the data processing module includes a signal transceiver and a battery management system, the temperature acquisition end is electrically connected to the signal transceiver, and the signal transceiver is electrically connected to the battery management system;

the signal transceiver is used for calculating temperature information according to the detection signal of the temperature acquisition end and sending the temperature information to the battery management system;

and the battery management system is used for judging that the battery module is out of thermal runaway when the temperature information reaches a preset value.

In an alternative embodiment, the battery management system is further configured to perform a preset abnormality processing operation in the case where it is determined that the thermal runaway of the battery module occurs.

In a second aspect, the present invention provides a battery thermal runaway detection method, which is applied to the battery thermal runaway detection system described in the foregoing embodiment, and the method includes:

the data processing module acquires a detection signal of the temperature acquisition end;

the data processing module calculates temperature information according to the detection signal;

and the data processing module judges that the battery module is out of thermal runaway when the temperature information reaches a preset value.

The embodiment of the invention provides a battery thermal runaway detection system and a method thereof, wherein the battery thermal runaway detection system comprises: the temperature data acquisition module comprises a plurality of thermocouples, the temperature acquisition ends of at least two thermocouples in the plurality of thermocouples are electrically connected with the data processing module, the temperature measurement ends of at least two thermocouples in the plurality of thermocouples are electrically connected, the temperature measurement end of each thermocouple is close to an explosion-proof valve in the battery module, and the plurality of thermocouples and the data processing module form at least one temperature detection loop; the data processing module is used for calculating temperature information according to the detection signal of the temperature acquisition end, and judging that the battery module is out of control due to heat when the temperature information reaches a preset value. The real-time detection of the temperature of the battery module is realized by utilizing the temperature detection loop formed by the thermocouples and the data processing module, so that the detection timeliness rate of thermal runaway of the battery module is improved.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate 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 schematic diagram illustrating a composition of a thermal runaway detection system for a battery according to an embodiment of the invention;

FIG. 2 shows a schematic view of a connection of the thermocouples of FIG. 1;

FIG. 3 shows another schematic connection diagram of the plurality of thermocouples of FIG. 1;

FIG. 4 shows another schematic connection diagram of the plurality of thermocouples of FIG. 1;

FIG. 5 shows a further schematic diagram of the connections of the plurality of thermocouples of FIG. 1;

FIG. 6 shows a further schematic diagram of the connections of the plurality of thermocouples of FIG. 1;

FIG. 7 is a schematic diagram of an architecture of the data processing module of FIG. 1;

fig. 8 is a schematic flow chart illustrating a method for detecting thermal runaway of a battery according to an embodiment of the present invention.

Icon: 100-battery thermal runaway detection system; 200-a temperature data acquisition module; 300-a data processing module; 310-a signal transceiver; 320-battery management system.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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 of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Referring to fig. 1, fig. 1 is a schematic diagram illustrating a battery thermal runaway detection system 100 according to an embodiment of the invention. The battery thermal runaway detection system 100 includes a temperature data acquisition module 200 and a data processing module 300, wherein the temperature data acquisition module 200 and the data processing module 300 are electrically connected to form one or more temperature detection loops. The temperature data acquisition module 200 includes a plurality of thermocouples, the temperature acquisition ends of at least two of the plurality of thermocouples are electrically connected to the data processing module 300, the temperature measurement ends of at least two of the plurality of thermocouples are electrically connected, the temperature measurement end of each thermocouple is close to the explosion-proof valve in the battery module, and the plurality of thermocouples and the data processing module form at least one temperature detection loop.

In the present embodiment, the temperature measuring end of the thermocouple may be preferentially disposed in the explosion-proof valve region to ensure the detection accuracy of the temperature of the battery module. Of course, in practical application, the temperature measuring end of the thermocouple may be arranged around the explosion-proof valve area according to requirements, and the embodiment does not limit this.

The data processing module 300 is configured to calculate temperature information according to the detection signal of the temperature acquisition end.

In this embodiment, this detected signal can be the thermal potential difference signal, and when the battery cell in the battery module took place thermal runaway, can follow explosion-proof valve blowout high temperature gas, and at this moment, the temperature measurement end can detect this gas to the temperature of this temperature measurement end also can change because of the temperature influence of this gas, thereby forms the thermal potential difference signal, and this thermal potential difference signal can be transmitted the temperature acquisition end through the temperature detection return circuit.

The data processing module 300 is further configured to determine that thermal runaway occurs in the battery module when the temperature information reaches a preset value.

In this embodiment, the temperature information calculated by the data processing module 300 may include a temperature value and/or a temperature change rate. If the absolute value of the temperature value is not less than the preset temperature value, judging that the battery module is out of control due to heat; and if the absolute value of the temperature value is less than the preset temperature value, judging that the thermal runaway of the battery module does not occur.

If the temperature change rate is not less than the preset temperature change rate, judging that the battery module is out of control due to heat; and if the temperature change rate is smaller than the preset temperature change rate, judging that the thermal runaway of the battery module does not occur.

Aiming at the condition that the temperature information simultaneously comprises a temperature value and a temperature change rate, if the absolute value of the temperature value is not less than a preset temperature value and the temperature change rate is not less than the preset temperature change rate, judging that the battery module is out of control due to heat; and if the absolute value of the temperature value is smaller than the preset temperature value and the temperature change rate is smaller than the preset temperature change rate, judging that the thermal runaway of the battery module does not occur.

As can be seen, the battery thermal runaway detection system 100 provided in the embodiment of the present invention utilizes the temperature detection loop formed by the plurality of thermocouples and the data processing module 300 to implement real-time detection of the temperature of the battery module, thereby improving the detection timeliness of the thermal runaway of the battery module.

In practical applications, the thermocouples in the temperature data acquisition module 200 may be electrically connected in a variety of connection manners. In this embodiment, 4 different connection modes are given, and the 4 connection modes will be described below.

In a first connection manner, please refer to fig. 2, the temperature acquisition end of each thermocouple of the plurality of thermocouples is electrically connected to the data processing module 300, the plurality of thermocouples includes at least one positive thermocouple and at least one negative thermocouple, the temperature measurement end of the positive thermocouple is electrically connected to the temperature measurement end of the negative thermocouple in a one-to-one correspondence manner, and each positive thermocouple, the negative thermocouple electrically connected to the positive thermocouple, and the data processing module 300 form a temperature detection loop.

In an implementation mode, the temperature measuring end of a positive thermocouple and the temperature measuring end of a negative thermocouple are electrically connected through a lead, and the temperature measuring ends of the positive thermocouple and the negative thermocouple are fixed near an explosion-proof valve of the battery module according to the structure of the battery module, or the temperature measuring ends can be directly fixed on the surface of a metal shell of the battery.

In this embodiment, the temperature acquisition ends of the positive thermocouple and the negative thermocouple are electrically connected to the data processing module 300, so as to form a temperature detection loop.

In the temperature detection circuit, the length of the wire connecting the temperature measurement ends of the positive thermocouple and the negative thermocouple may be configured according to the battery characteristics. For example, for a battery having a small capacity, a low energy density, or a small gas production amount when thermal runaway occurs, the lead wire for electrically connecting the thermocouple may be configured to have a short length; for the batteries with large electric capacity, high energy density or more gas production when thermal runaway occurs, the lead for electrically connecting the thermocouple can be configured with a longer length so as to optimize the distance between the temperature measuring ends, thereby being capable of detecting the temperature change of each battery.

It should be noted that, in the above-mentioned temperature detection loop, the thermocouples used must be a positive thermocouple and a negative thermocouple, and if thermocouples with the same polarity are used, for example, two positive thermocouples or two negative thermocouples are used at the same time, the temperature detection loop cannot be formed; in this embodiment, the wire electrically connecting the temperature measuring end of the positive thermocouple and the temperature measuring end of the negative thermocouple may be made of copper or aluminum.

In practical application, as shown in fig. 3, a plurality of temperature detection loops can be further arranged to realize the temperature detection of the battery module in different zones, so that whether the battery module is out of control due to thermal runaway can be judged in time.

It can be seen that, in the battery thermal runaway detection system 100 provided in the embodiment of the present invention, the temperature change of the battery module is detected in real time by using a temperature detection loop formed by a positive thermocouple, a negative thermocouple, and the data processing module 300; the length of the lead used for electrically connecting the positive thermocouple and the negative thermocouple can be configured according to the characteristics of the battery, so that the temperature change condition in the battery module can be detected more accurately in real time, and whether the thermal runaway of the battery module occurs can be judged in time.

Referring to fig. 4, the plurality of thermocouples includes a first thermocouple, a second thermocouple and a third thermocouple, the first thermocouple and the second thermocouple have different polarities, and the second thermocouple and the third thermocouple have the same polarity; the first thermocouple, the second thermocouple and the third thermocouple each include a first end and a second end, the first end of the first thermocouple, the first end of the second thermocouple and the first end of the third thermocouple are electrically connected to each other, and the second end of the first thermocouple, the second end of the second thermocouple and the second end of the third thermocouple are electrically connected to the data processing module 300.

The first end is a temperature measuring end, the second end of the first thermocouple and the second end of the third thermocouple are temperature collecting ends, and the first thermocouple, the second thermocouple, the third thermocouple and the data processing module 300 form a temperature detection loop.

In an implementation manner, the first end of the first thermocouple, the first end of the second thermocouple, and the first end of the third thermocouple are electrically connected through a lead, that is, the first end of the first thermocouple, the first end of the second thermocouple, and the first end of the third thermocouple are all connected to the same lead, and the first end of the first thermocouple, the first end of the second thermocouple, and the first end of the third thermocouple are fixed near an explosion-proof valve of the battery module according to the structure of the battery module.

In this embodiment, the second end of the first thermocouple is electrically connected to one end of the data processing module 300, and the second end of the second thermocouple and the second end of the third thermocouple are electrically connected to the other end of the data processing module 300, so as to form a temperature detection loop; the second end of the first thermocouple and the second end of the third thermocouple are temperature acquisition ends, the second end of the second thermocouple is a connecting end, and the connecting end is only used for being electrically connected with the data processing module 300, so that a temperature detection loop can be formed; in addition, the polarity of the first thermocouple needs to be different from that of the second thermocouple, and the polarity of the second thermocouple needs to be the same as that of the third thermocouple, for example, when the first thermocouple is a positive electrode, the second thermocouple and the third thermocouple are negative electrodes; when the first thermocouple is a negative electrode, the second thermocouple and the third thermocouple are positive electrodes.

In the temperature detection circuit, the lengths of the wires connecting the first ends of the first, second, and third thermocouples may be configured according to the characteristics of the battery. For example, for a battery having a small capacity, a low energy density, or a small gas production amount when thermal runaway occurs, the lead wires for electrically connecting the first thermocouple, the second thermocouple, and the third thermocouple may be configured to have a short length; for the batteries with large electric capacity, high energy density or more gas production when thermal runaway occurs, the lead for electrically connecting the first thermocouple, the second thermocouple and the third thermocouple can be configured with a longer length so as to optimize the distance between the temperature measuring ends, thereby being capable of detecting the temperature change of each battery.

It should be noted that, in the present embodiment, there is no limitation on the number of the second thermocouples, and a person skilled in the art may determine the required number of the second thermocouples according to the actual structure of the battery module.

Therefore, in the battery thermal runaway detection system provided by the embodiment of the invention, the temperature change of the battery module is detected in real time by using the temperature detection loop formed by the first thermocouple, the second thermocouple, the third thermocouple and the data processing module 300; the length of the lead used for electrically connecting the first thermocouple, the second thermocouple and the third thermocouple can be configured according to the characteristics of the battery, so that the temperature change condition in the battery module can be detected more accurately in real time, and whether the battery module is out of control due to heat can be judged in time.

Referring to fig. 5, the plurality of thermocouples include at least one positive thermocouple and at least one negative thermocouple, the positive thermocouples and the negative thermocouples are alternately electrically connected, and the polarity of the first thermocouple and the polarity of the last thermocouple are different.

The end of the first thermocouple and the last thermocouple which is not electrically connected with the residual heat thermocouple is a temperature acquisition end, and the temperature acquisition ends of the first thermocouple and the last thermocouple are electrically connected with the data processing module 300.

The connection point of the positive thermocouple and the negative thermocouple in the plurality of thermocouples is a temperature measuring end.

In this embodiment, the positive thermocouples are alternately electrically connected to the negative thermocouples, and a connection point, which is a temperature measuring end, is formed at the electrically connected portion of the positive thermocouples and the negative thermocouples and is fixed near the explosion-proof valve of the battery module according to the structure of the battery module.

In this embodiment, the temperature acquisition end of the first thermocouple and the temperature acquisition end of the last thermocouple are electrically connected to the data processing module 300, and the data processing module 300 and the plurality of thermocouples alternately electrically connected in the positive and negative directions form a temperature detection loop.

In the temperature detection circuit, the thermocouple length may be configured according to the battery characteristics. For example, for a battery with small capacitance, low energy density or less gas production when thermal runaway occurs, the positive thermocouple and the negative thermocouple can be configured to have shorter lengths; for the batteries with large electric capacity, high energy density or more gas production when thermal runaway occurs, the positive thermocouple and the negative thermocouple can be configured with longer lengths so as to enable the distance between temperature measuring ends to reach the optimum, and thus the temperature change of each battery can be detected.

It should be noted that, in the present embodiment, the number of thermocouples used for alternate connection is not limited, and those skilled in the art can determine the required number of thermocouples according to the actual structure of the battery module; however, in the temperature detection circuit, the number of positive thermocouples needs to be the same as the number of negative thermocouples, and the polarity of the last thermocouple needs to be different from that of the first thermocouple, for example, if the first thermocouple is a positive electrode, the last thermocouple is a negative electrode; if the first thermocouple is negative, the last thermocouple is positive.

Therefore, the battery thermal runaway detection system provided by the embodiment of the invention detects the temperature change of the battery module in real time by utilizing the temperature detection loop formed by the positive thermocouple and the negative thermocouple which are alternately and electrically connected and the data processing module 300; the lengths of the positive thermocouple and the negative thermocouple can be configured according to battery characteristics, so that the temperature change condition in the battery module can be detected more accurately in real time, and whether thermal runaway of the battery module occurs or not can be judged in time.

Referring to fig. 6, the thermocouples form a plurality of thermocouple groups, each thermocouple group includes an anode thermocouple and a cathode thermocouple, and the anode thermocouple is electrically connected to the cathode thermocouple; the thermocouple groups are electrically connected in sequence through leads, and the polarities of two thermocouples connected by the leads between any two adjacent thermocouple groups are different.

The junction of the positive thermocouple and the negative thermocouple in each thermocouple group is a temperature measuring end; the end of the first thermocouple group and the end of the last thermocouple group, which is not electrically connected with the residual heat thermocouple group, in the plurality of thermocouple groups is a temperature acquisition end, and the temperature acquisition ends of the first thermocouple group and the last thermocouple group are electrically connected with the data processing module 300; the plurality of thermocouple groups and the data processing module 300 form a temperature detection loop.

In this embodiment, a connection point is formed at a connection point of the positive thermocouple and the negative thermocouple, and the connection point is a temperature measuring end; and the temperature measuring end is fixed near the explosion-proof valve of the battery module according to the structure of the battery module.

In this embodiment, the thermocouple groups may be electrically connected by a wire, and the two thermocouples connected by the wire have different polarities, which may be understood as that all the thermocouples are electrically connected in an alternating manner of positive and negative; the temperature acquisition end of the first thermocouple group and the temperature acquisition end of the last thermocouple group are electrically connected with the data processing module 300 to form a temperature detection loop. For example, as shown in fig. 6, it is assumed that the black thermocouple is a positive thermocouple a, the gray thermocouple is a negative thermocouple B, and the thermocouple B in the first thermocouple group is electrically connected to the thermocouple a in the second thermocouple group through a wire, where the thermocouple B in the first thermocouple group is a negative electrode, and the thermocouple a in the second thermocouple group is a positive electrode; on the other hand, in the first thermocouple group, one end of the thermocouple a is electrically connected to the thermocouple B, and the other end is a temperature acquisition end and is electrically connected to the data processing module 300, and similarly, in the last thermocouple group, one end of the thermocouple B is electrically connected to the thermocouple a, and the other end is a temperature acquisition end and is electrically connected to the data processing module 300.

In the temperature detection circuit, the length of the wire connecting the thermocouple group may be configured according to the battery characteristics. For example, for a battery having a small capacity, a low energy density, or a small gas production amount when thermal runaway occurs, the lead wires for electrically connecting the thermocouple groups may be configured to have a short length; for the batteries with large electric capacity, high energy density or more gas production when thermal runaway occurs, the lead for electrically connecting the thermocouple groups can be configured with a longer length so as to optimize the distance between the temperature measuring ends, thereby being capable of detecting the temperature change of each battery.

It should be noted that, in the present embodiment, there is no limitation on the number of thermocouple groups, and those skilled in the art can determine the required number of thermocouple groups according to the actual structure of the battery module.

Therefore, in the battery thermal runaway detection system provided by the embodiment of the invention, a positive thermocouple and a negative thermocouple form a thermocouple group, and a plurality of thermocouple groups and the data processing module 300 form a temperature detection loop, so that the temperature change of the battery module is detected in real time; the length of the lead used for electrically connecting the thermocouple group can be configured according to the characteristics of the battery, so that the temperature change condition in the battery module can be more accurately detected in real time, and whether the battery module is out of control due to heat can be timely judged.

In one embodiment, referring to fig. 7, the data processing module 300 may include a signal transceiver 310 and a battery management system 320, wherein the signal transceiver 310 is electrically connected to the battery management system 320. The signal transceiver 310 may also be integrated in the battery management system 320.

The signal transceiver 310 is configured to calculate temperature information according to the detection signal of the temperature acquisition end, and send the temperature information to the battery management system 320.

In this embodiment, since the temperature acquisition end is electrically connected to the signal transceiver 310 in the temperature detection loop, the signal transceiver 310 may receive the detection signal received by the temperature acquisition end, calculate the detection signal to obtain temperature information, and send the temperature information to the battery management system 320.

The battery management system 320 is used for determining that the battery module is out of thermal runaway when the temperature information reaches a preset value.

In this embodiment, after receiving the temperature information, the battery management system 320 determines the temperature information to determine whether thermal runaway occurs in the battery module.

If the absolute value of the temperature value is not less than the preset temperature value, judging that the battery module is out of control due to heat; and if the absolute value of the temperature value is less than the preset temperature value, judging that the thermal runaway of the battery module does not occur.

If the temperature change rate is not less than the preset temperature change rate, judging that the battery module is out of control due to heat; and if the temperature change rate is smaller than the preset temperature change rate, judging that the thermal runaway of the battery module does not occur.

Aiming at the condition that the temperature information simultaneously comprises a temperature value and a temperature change rate, if the absolute value of the temperature value is not less than a preset temperature value and the temperature change rate is not less than the preset temperature change rate, judging that the battery module is out of control due to heat; and if the absolute value of the temperature value is smaller than the preset temperature value and the temperature change rate is smaller than the preset temperature change rate, judging that the thermal runaway of the battery module does not occur.

The battery management system 320 is also used to perform a preset abnormality processing operation in the case where it is determined that thermal runaway of the battery module occurs. Wherein the abnormality processing operation includes issuing an alarm and taking a cooling measure for the battery module.

It can be seen that, in the battery thermal runaway detection system provided in the embodiment of the present invention, the signal transceiver 310 converts the detection signal received by the temperature acquisition end into temperature information, and then sends the temperature information to the battery management system 320, so that the battery management system 320 can determine whether thermal runaway occurs in the battery module through the judgment on the temperature information, and if it is determined that thermal runaway occurs in the battery module, a preset abnormal processing operation is performed, thereby improving the detection time rate for detecting the temperature of the battery module and detecting the thermal runaway of the battery module.

Referring to fig. 8, fig. 8 is a schematic flow chart of a method for detecting thermal runaway of a battery according to an embodiment of the present invention. It should be noted that the basic principle and the generated technical effects of the method for detecting thermal runaway of a battery provided by the embodiment are the same as those of the embodiment described above, and for brief description, no part of the embodiment may refer to the corresponding contents in the embodiment described above. The battery thermal runaway detection method can be applied to the battery thermal runaway detection system 100, and can include the following steps:

step S110, the data processing module acquires a detection signal of the temperature acquisition end.

In the present embodiment, the data processing module 300 includes a signal transceiver 310 and a battery management system 320. When the monomer battery temperature in the battery module changes, can follow explosion-proof valve blowout gas, at this moment, the temperature measurement end can detect this gas to this temperature measurement end temperature also can change because of the influence of this gas, thereby forms the detected signal, and this detected signal can pass through the temperature and detect the return circuit and transmit the temperature acquisition end.

And step S120, the data processing module calculates temperature information according to the detection signal.

In this embodiment, since the temperature acquisition end is electrically connected to the signal transceiver 310 in the temperature detection loop, the signal transceiver 310 can also receive the detection signal received by the temperature acquisition end, calculate the detection signal to obtain temperature information, and send the temperature information to the battery management system 320. The detection signal is a thermoelectric potential difference signal, and the temperature information comprises a temperature value and/or a temperature change rate.

And S130, judging that the battery module is out of control due to heat when the temperature information reaches a preset value by the data processing module.

In this embodiment, after receiving the temperature information, the battery management system 320 determines the temperature information to determine whether thermal runaway occurs in the battery module.

If the absolute value of the temperature value is not less than the preset temperature value, judging that the battery module is out of control due to heat; and if the absolute value of the temperature value is less than the preset temperature value, judging that the thermal runaway of the battery module does not occur.

If the temperature change rate is not less than the preset temperature change rate, judging that the battery module is out of control due to heat; and if the temperature change rate is smaller than the preset temperature change rate, judging that the thermal runaway of the battery module does not occur.

Aiming at the condition that the temperature information simultaneously comprises a temperature value and a temperature change rate, if the absolute value of the temperature value is not less than a preset temperature value and the temperature change rate is not less than the preset temperature change rate, judging that the battery module is out of control due to heat; and if the absolute value of the temperature value is smaller than the preset temperature value and the temperature change rate is smaller than the preset temperature change rate, judging that the thermal runaway of the battery module does not occur.

Alternatively, the battery management system 320 may also perform a preset abnormality processing operation in the case where it is determined that thermal runaway of the battery module occurs. Wherein the abnormality processing operation includes issuing an alarm and taking a cooling measure for the battery module.

In summary, the embodiment of the present invention provides a system and a method for detecting a thermal runaway of a battery, where the system includes: the temperature data acquisition module comprises a plurality of thermocouples, the temperature acquisition ends of at least two thermocouples in the plurality of thermocouples are electrically connected with the data processing module, the temperature measurement ends of at least two thermocouples in the plurality of thermocouples are electrically connected, the temperature measurement end of each thermocouple is close to an explosion-proof valve in the battery module, and the plurality of thermocouples and the data processing module form at least one temperature detection loop; the data processing module is used for calculating temperature information according to the detection signal of the temperature acquisition end, and judging that the battery module is out of control due to heat when the temperature information reaches a preset value. The real-time detection of the temperature of the battery module is realized by utilizing the temperature detection loop formed by the thermocouples and the data processing module, so that the detection timeliness rate of thermal runaway of the battery module is improved.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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.