Battery cell assembly, battery pack and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a battery cell assembly, a battery pack and electric equipment, the battery cell assembly comprises a battery cell body, a temperature sensing layer and an early warning part; the temperature sensing layer is arranged on the surface of the battery cell body and is suitable for generating corresponding thermal voltage between the first temperature sensing point and the second temperature sensing point according to the temperature change of the battery cell body; the early warning component is arranged on a temperature sensing circuit between the first temperature sensing point and the second temperature sensing point, and when the thermal voltage reaches a preset value, the early warning component sends out alarm information. According to the battery cell assembly provided by the embodiment of the utility model, the temperature sensing layer is arranged on the surface of the battery cell body, so that the temperature sensing layer can generate corresponding thermal voltage according to the temperature change of the battery cell body; the early warning component is arranged between the first temperature sensing point and the second temperature sensing point of the temperature sensing layer, so that when the thermal voltage transmitted to the early warning component by the temperature sensing layer reaches the preset value, the early warning component can generate alarm information according to the corresponding thermal voltage, namely the thermal runaway of the battery cell body is fed back in time.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery core assembly, a battery pack and electrical equipment. Background Art

[0002] With the in-depth development of lithium battery technology, thermal runaway of lithium batteries has become a technical problem that needs to be solved urgently. The existing technology generally adds a thermal runaway monitoring device to the battery module. The thermal runaway monitoring device includes a thermal runaway monitoring module and a battery controller that are electrically connected to each other. When thermal runaway occurs, the resistance value of the thermal runaway monitoring module will change, and then the battery controller can determine whether the lithium battery has thermal runaway through the current change and make a corresponding warning.

[0003] However, the battery controller and thermal runaway monitoring module in the thermal runaway monitoring device are relatively complex and have high production costs. In addition, the thermal runaway monitoring device also requires an external power supply to power it. The above factors hinder the application of lithium battery thermal runaway warning devices and increase the risk of thermal runaway of lithium batteries. Utility Model Content

[0004] The first aspect of the utility model provides a battery cell assembly to solve the defect that the thermal runaway monitoring device in the prior art is relatively complicated, and the thermal runaway monitoring of the battery cell assembly can be realized through a simple temperature sensing layer and early warning components.

[0005] A second aspect of the present invention provides a battery pack.

[0006] A third aspect of the utility model provides an electrical device.

[0007] The first aspect of the utility model provides a battery core assembly, comprising:

[0008] Battery cell body;

[0009] A temperature sensing layer is disposed on the surface of the battery body and is adapted to generate a corresponding thermovoltage between a first temperature sensing point and a second temperature sensing point according to a temperature change of the battery body;

[0010] An early warning component is provided in a temperature sensing circuit between the first temperature sensing point and the second temperature sensing point. When the thermal voltage reaches a preset value, the early warning component sends out an alarm message.

[0011] The battery core assembly provided by the utility model further includes a temperature insulation layer, and the temperature insulation layer is wrapped around the surface of the temperature sensitive layer.

[0012] The battery core assembly provided by the utility model further includes a packaging layer, and the packaging layer is wrapped around the surface of the thermal insulation layer.

[0013] According to the battery core assembly provided by the utility model, the temperature sensing layer includes thermoelectric ion gel.

[0014] A second aspect of the present invention provides a battery pack, comprising the battery cell assembly described in any one of the aforementioned embodiments, wherein a plurality of the battery cell assemblies are arranged in an array.

[0015] According to the battery pack provided by the utility model, the early warning component is arranged in the temperature sensing circuit of the temperature sensing layer of one of the battery cell assemblies, and the temperature sensing layers of the remaining battery cell assemblies are arranged in parallel with the temperature sensing circuit in which the early warning component is arranged.

[0016] According to the battery pack provided by the utility model, the early warning component includes a buzzer, and the buzzer emits an alarm sound signal based on the thermal voltage.

[0017] According to the battery pack provided by the utility model, the warning component includes a battery management system, and the battery management system is electrically connected to the temperature-sensitive layer of each battery cell assembly, and is used to issue alarm information according to the thermal voltage of the corresponding temperature-sensitive layer.

[0018] According to the battery pack provided by the utility model, it also includes a converter, which is electrically connected to the battery management system. The battery management system transmits signals to the wireless communication module through the converter, and the wireless communication module transmits the signals to the terminal.

[0019] A third aspect of the present invention provides an electrical device, comprising a device body and a battery pack as described in any one of the aforementioned embodiments, wherein the battery pack is arranged on the device body.

[0020] In the battery cell assembly provided in the embodiment of the utility model, a temperature-sensitive layer is arranged on the surface of the battery cell body, so that the temperature-sensitive layer can generate corresponding thermal voltage according to the temperature change of the battery cell body; further, the early warning component is arranged between the first temperature-sensitive point and the second temperature-sensitive point of the temperature-sensitive layer, so that when the thermal voltage transmitted from the temperature-sensitive layer to the early warning component reaches a preset value, the early warning component can generate alarm information according to the corresponding thermal voltage, thereby realizing timely feedback on thermal runaway of the battery cell body.

[0021] Compared with the prior art, in the battery cell assembly provided in the embodiment of the utility model, there is no need to add a complex thermal runaway monitoring module and a battery controller, which simplifies the early warning device for battery thermal runaway, making the battery cell assembly with a thermal runaway early warning function easy to promote and use, reducing the risk of battery thermal runaway and improving the safety of the battery cell assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a schematic diagram of the overall structure of the battery core assembly provided by the embodiment of the utility model;

[0024] Figure 2 It is a schematic diagram of the assembly structure of multiple battery core components provided by an embodiment of the utility model.

[0025] Reference numerals:

[0026] 100: battery cell assembly; 110: battery cell body; 120: temperature sensing layer; 130: warning component; 131: buzzer; 140: thermal insulation layer; 150: packaging layer. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0029] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0031] As lithium-ion batteries are increasingly used in the field of energy storage, actual users' demand for the energy density of lithium-ion batteries continues to increase. Since batteries generate a lot of heat during use, the problem of thermal runaway of batteries has become a technical problem that needs to be solved urgently. In the design of battery modules, if thermal insulation and flame retardant design is not carried out in a targeted manner, once a single cell has thermal runaway, it will immediately spread to other adjacent single cells, forming a chain reaction. In severe cases, it will cause the entire battery pack to catch fire and explode. Therefore, by using technical means to extend the thermal runaway propagation time of single cells and to issue an early warning at the first time when thermal runaway occurs, more time can be provided for safe escape, which is conducive to improving the safety of lithium-ion batteries during use.

[0032] The prior art generally adds a thermal runaway monitoring device to the battery module. The thermal runaway monitoring device includes a thermal runaway monitoring module and a battery controller that are electrically connected to each other. When thermal runaway occurs, the resistance value of the thermal runaway monitoring module will change, and the battery controller can then determine whether thermal runaway has occurred in the lithium battery by the change in current and make a corresponding warning.

[0033] However, the battery controller and thermal runaway monitoring module in the thermal runaway monitoring device are relatively complex. In addition, the thermal runaway monitoring device also requires an external power supply to power it. The above factors hinder the application of lithium battery thermal runaway warning devices and increase the risk of thermal runaway of lithium batteries. And the thermal runaway monitoring device cannot play a role in delaying thermal runaway. In order to solve at least one of the defects in the above technical problems, the embodiments of the utility model provide a battery cell assembly, a battery pack and an electrical device.

[0034] Figure 1 It is a schematic diagram of the overall structure of the battery core assembly provided by an embodiment of the utility model.

[0035] Reference Figure 1A first aspect of the utility model provides a battery cell assembly 100 , which includes a battery cell body 110 , a temperature sensing layer 120 and an early warning component 130 .

[0036] For the convenience of explanation, a square battery cell is taken as an example in the embodiment of the utility model. It should be noted here that the example of the above square battery cell is not a specific limitation of the embodiment of the utility model. The battery cell can also be a cylindrical battery cell, a soft-pack battery cell or a polygonal battery cell, etc. Specifically, it is selected according to the practicality of the actual situation.

[0037] Among them, continue to refer to Figure 1 The temperature-sensing layer 120 is arranged on the surface of the battery cell and is suitable for generating a corresponding thermovoltage between a first temperature-sensing point and a second temperature-sensing point according to the temperature change of the battery cell body 110; specifically, the temperature-sensing layer 120 includes a thermoelectric ion gel, and the first temperature-sensing point is arranged at one of the hot end and the cold end of the thermoelectric ion gel, and the second temperature-sensing point is arranged at the other of the hot end and the cold end of the thermoelectric ion gel. When thermal runaway occurs inside the battery cell, the temperature of the battery cell body 110 will rise sharply in a short time, and a large amount of heat will be generated inside the battery cell body 110. The heat inside the battery cell body 110 will diffuse outward and be transferred to the temperature-sensing layer 120 outside the battery cell body 110.

[0038] When the temperature-sensing layer 120 absorbs a large amount of heat generated by the battery cell body 110, the temperature of the thermoelectric ion gel in the temperature-sensing layer 120 will also increase, and the carriers in the thermoelectric ion gel will migrate from the hot end to the cold end of the thermoelectric ion gel. The carriers carry charge, so a corresponding thermovoltage will be generated between the first temperature-sensing point and the second temperature-sensing point of the thermoelectric ion gel. In other words, a certain electromotive force and current will be generated.

[0039] It should be noted here that the aforementioned hot end and cold end refer to two positions with temperature difference caused by uneven heating of the thermoelectric ion gel. In actual use, the hot end and the cold end can be adaptively adjusted according to actual conditions, such as the main heating area of ​​the battery body 110. In other words, the first temperature sensing point and the second temperature sensing point in the embodiment of the utility model can be adaptively adjusted according to actual conditions. Figure 1 The example shown is only an example given for the convenience of explanation of the present invention and is not intended to be a specific limitation of the present invention.

[0040] Continue to refer to Figure 1The early warning component 130 is arranged in a temperature sensing circuit between the first temperature sensing point and the second temperature sensing point. In other words, the first temperature sensing point and the second temperature sensing point are electrically connected to the early warning component 130 respectively. The thermal voltage generated by the aforementioned temperature sensing layer 120 due to heat can be transmitted to the early warning component 130 through the electrical connection thereat. When the thermal voltage reaches a preset value, the early warning component 130 issues an alarm message to prompt that the battery cell at that location has generated thermal runaway. Alternatively, according to the preset value of the adaptively adjusted temperature, the alarm message may also indicate that the temperature of the battery cell at that location is too high or is about to generate thermal runaway.

[0041] It should be noted here that the specific conditions of different types of battery cells are different, and the preset value can be adaptively adjusted according to the critical temperature when thermal runaway occurs in the actual battery cell. The utility model does not make specific limitations on this. It should also be noted here that the aforementioned electrical connection method can be achieved through conductor connections such as wires. There are many ways of electrical connection, and the embodiments of the utility model will not be listed one by one here. In an optional embodiment of the utility model, the temperature sensing layer 120 may also include ionic hydrogel or other materials with thermoelectric properties. Specifically, the application of ionic hydrogel refers to the thermoelectric ionic gel described above, and the embodiments of the utility model will not be repeated here.

[0042] Reference Figure 1 It can be understood that, in the battery cell assembly 100 provided in the embodiment of the present utility model, by arranging the temperature-sensitive layer 120 on the surface of the battery cell body 110, the temperature-sensitive layer 120 can generate corresponding thermovoltage according to the temperature change of the battery cell body 110; further, the early warning component 130 is arranged between the first temperature-sensitive point and the second temperature-sensitive point of the temperature-sensitive layer 120, so that when the thermovoltage transmitted from the temperature-sensitive layer 120 to the early warning component 130 reaches a preset value, the early warning component 130 can generate alarm information according to the corresponding thermovoltage, that is, realize timely feedback on the thermal runaway of the battery cell body 110.

[0043] Compared with the prior art, in the battery cell assembly 100 provided in the embodiment of the utility model, there is no need to add a complex thermal runaway monitoring module and a battery controller, which simplifies the early warning device for battery thermal runaway, making the battery cell assembly 100 with a thermal runaway early warning function easy to promote and use, reducing the risk of battery thermal runaway and improving the safety of the battery cell assembly 100.

[0044] In an optional embodiment of the present invention, the battery cell assembly 100 further includes a thermal insulation layer 140, which is wrapped around the surface of the temperature-sensitive layer 120. Specifically, the thermal insulation layer 140 may include one of aerogel, foam, plastic foam, ultrafine glass wool, high silica wool or vacuum insulation board. In the embodiment of the present invention, the thermal insulation layer 140 includes aerogel as a specific example and is explained; the thermal conductivity of the aerogel is low. When thermal runaway occurs in the battery cell body 110, the aerogel can effectively block the heat diffusion of the battery cell, delay or block the thermal runaway of the battery cell. Thermal runaway may further lead to accidents such as combustion or explosion. When it is used in combination with the early warning component 130 described in the aforementioned embodiment, after the early warning component 130 sends out an alarm message, delaying the thermal runaway through the thermal insulation layer 140 can create time for further safety rescue measures and solve the problem of too short safety response time. In this way, the safety of the battery cell assembly 100 can be further improved. At the same time, by timely guiding the thermal runaway of the battery cell assembly 100, the damage rate of the battery cell assembly 100 can be reduced and the durability of the battery cell assembly 100 can be improved.

[0045] In addition, when the battery cell assembly 100 is charging and discharging, the thermal insulation layer 140 can effectively prevent the battery cell assembly 100 from generating a large amount of heat due to charging and discharging; in addition, when the battery cell assembly 100 begins to burn due to overheating, the thermal insulation layer 140 can effectively prevent the spread of fire and heat, slow down the chain reaction between multiple battery cell assemblies 100, and provide sufficient time for escape.

[0046] In an optional embodiment of the present utility model, the battery cell assembly 100 further includes a packaging layer 150, which is wrapped on the surface of the thermal insulation layer 140. Specifically, the packaging layer 150 may include structural adhesive, epoxy resin adhesive or polyurethane adhesive, etc. Specifically, it can be adaptively selected according to actual conditions. It can be understood that by arranging the packaging layer 150 on the surface of the thermal insulation layer 140, the overall structure of the battery cell assembly 100 can be packaged and protected, which is conducive to improving the safety of the battery cell assembly 100.

[0047] The second aspect of the utility model provides a battery pack, the battery includes the battery cell assembly 100 described in any of the above embodiments, multiple battery cell assemblies 100 are arranged in an array to form a battery module, and multiple battery modules are further arranged in an array to form a battery pack, and the array arrangement can be in a horizontal direction or a vertical direction. Specifically, it can be adaptively selected according to actual conditions. Among them, the temperature sensing circuit of each battery cell assembly 100 is independently connected to the corresponding early warning component 130, so that accurate monitoring of a single battery cell assembly 100 can be achieved, and the accuracy of thermal runaway processing of the battery cell assembly 100 can be improved.

[0048] Figure 2 It is a schematic diagram of the assembly structure of multiple battery core components provided by an embodiment of the utility model.

[0049] In an optional embodiment of the present utility model, referring to Figure 2 , the early warning component 130 is arranged in the temperature sensing circuit of the temperature sensing layer 120 of one of the battery cell assemblies 100, and the temperature sensing layers 120 of the other battery cell assemblies 100 are arranged in parallel with the temperature sensing circuit of the early warning component 130. In this way, the thermal runaway of multiple battery cell assemblies 100 can be monitored by one early warning component 130, the number of early warning components 130 can be reduced, the assembly relationship of multiple battery cell assemblies 100 can be simplified, the assembly efficiency can be improved, the production cost can be reduced, and the economic benefits can be improved.

[0050] In an optional embodiment of the present invention, the warning component 130 includes a buzzer 131, which emits an alarm sound signal based on thermal voltage. The buzzer 131 may include a piezoelectric buzzer or an electromagnetic buzzer, and may be adaptively adjusted according to actual conditions.

[0051] Specifically, when thermal runaway occurs inside the battery cell, the temperature of the battery cell body 110 will rise sharply in a short period of time, and a large amount of heat will be generated inside the battery cell body 110. The heat inside the battery cell body 110 will diffuse outward and be transferred to the temperature-sensitive layer 120 outside the battery cell body 110. The temperature-sensitive layer 120 will be heated and a corresponding thermal voltage will be generated between the first temperature-sensitive point and the second temperature-sensitive point of the thermoelectric ion gel. Since the buzzer 131 is arranged on the temperature-sensing circuit between the first temperature-sensing point and the second temperature-sensing point, when the thermal voltage reaches a preset value, the current in the temperature-sensing circuit can generate a sound signal under the action of the resonance device through the amplifying sampling circuit of the internal oscillation system of the buzzer 131, so as to prompt that thermal runaway has occurred in the battery cell at that location.

[0052] Reference Figure 2 It can be understood that in the battery pack provided in the embodiment of the utility model, by providing a buzzer 131, the device of the early warning component 130 can be simplified, and the buzzer 131 is easy to obtain, low-priced, and simple to assemble. In this way, the cost of the early warning component 130 is reduced, the overall economic benefits of the battery pack are improved, and the application and promotion of the battery pack are promoted. It should be noted here that in an optional embodiment of the utility model, each battery cell assembly 100 can also be connected to a buzzer 131 to achieve accurate monitoring of thermal runaway of the battery cell assembly 100. Specifically, an adaptive selection can be made according to actual conditions.

[0053] In an optional embodiment of the utility model, the early warning component 130 also includes a battery management system (BATTERYMANAGEMENT SYSTEM, BMS), which is electrically connected to the temperature-sensitive layer 120 of each battery cell assembly 100, and is used to issue an alarm message according to the thermal voltage of the corresponding temperature-sensitive layer 120. Specifically, the battery management system is commonly known as a battery nanny or a battery butler, and a display module is provided in the battery management system. When the thermal voltage generated by the temperature-sensitive layer 120 in the battery cell assembly 100 exceeds a preset value, the display module in the battery management system can display an alarm message to indicate that the battery cell at that location has generated thermal runaway, or, according to the preset value of the adaptively adjusted temperature, the alarm message can also indicate that the temperature of the battery cell at that location is too high or is about to generate thermal runaway.

[0054] It is understandable that in the battery pack provided by the embodiment of the utility model, by connecting the temperature-sensitive layer 120 with the battery management system, the thermal runaway of the battery cell assembly 100 can be directly warned by the battery management system, which simplifies the early warning device for battery thermal runaway, makes the battery cell assembly 100 with the thermal runaway early warning function easy to be promoted and used, reduces the risk of battery thermal runaway, and improves the safety of the battery cell assembly 100. In addition, the battery management system and the buzzer 131 are used synchronously, and the two can be compared with each other to improve the accuracy of the alarm information issued by the early warning component 130. In addition, the battery management system and the buzzer 131 can also be used as redundant designs for each other. When one of them is damaged, the other can continue to issue an alarm message. When the battery cell assembly 100 has a thermal runaway, it can ensure that the early warning component 130 stably issues an early warning message, thereby improving the stability of the early warning component 130.

[0055] In an optional embodiment of the utility model, the battery pack also includes a converter, which is electrically connected to the battery management system. The battery management system transmits a signal to the wireless communication module through the converter, and the wireless communication module transmits the signal to the terminal. Specifically, when the thermal voltage generated by the temperature-sensitive layer 120 in the battery cell assembly 100 exceeds a preset value, the display module in the battery management system displays an alarm signal, and the battery management system transmits the signal to the converter. The converter can convert the signal into a signal that can be received by the wireless communication module, such as a Bluetooth signal or a wifi signal. The wireless communication module can further transmit the signal to the terminal to realize the alarm function of thermal runaway of the battery cell assembly 100.

[0056] It is understandable that by setting up a converter, the warning function of the battery management system can be expanded and extended. When the terminal is a mobile phone or a computer control screen in the cab, the information of thermal runaway of the battery assembly 100 can be directly obtained, which is convenient for the user to quickly take the next step. When the battery assembly 100 starts to burn due to overheating, the escape time can be increased, and the safety of the battery pack can be improved.

[0057] The third aspect of the utility model provides an electric device, including a device body and a battery pack of any of the aforementioned embodiments, the battery pack being arranged in the device body. Taking a vehicle as an example, in an optional embodiment of the utility model, the terminal in the aforementioned embodiment may be a display device in the vehicle cab, and the display device may specifically be a dashboard or display in the cab, etc., so that the driver can quickly learn about the thermal runaway of the battery cell assembly 100 of the battery pack, further improving the safety of the electric device.

[0058] It should be noted that the technical solutions in various embodiments of the present utility model can be combined with each other, but the basis for the mutual combination is that it can be implemented by ordinary technicians in the field; when the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist, that is, it does not belong to the protection scope of the present utility model.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A battery cell assembly, characterized in that: include: Battery cell body; A temperature sensing layer is disposed on the surface of the battery body and is adapted to generate a corresponding thermovoltage between a first temperature sensing point and a second temperature sensing point according to a temperature change of the battery body; An early warning component is provided in a temperature sensing circuit between the first temperature sensing point and the second temperature sensing point. When the thermal voltage reaches a preset value, the early warning component sends out an alarm message.

2. The battery cell assembly according to claim 1, characterized in that: It also includes a temperature insulation layer, which is wrapped around the surface of the temperature sensing layer.

3. The battery cell assembly according to claim 2, characterized in that: It also includes a packaging layer, which is wrapped around the surface of the thermal insulation layer.

4. The battery core assembly according to any one of claims 1 to 3, characterized in that: The temperature sensing layer includes thermoelectric ion gel.

5. A battery pack, characterized in that: It comprises a plurality of battery cell assemblies according to any one of claims 1 to 4, wherein the plurality of battery cell assemblies are arranged in an array.

6. The battery pack according to claim 5, characterized in that: The early warning component is arranged in a temperature sensing circuit of the temperature sensing layer of one of the battery cell assemblies, and the temperature sensing layers of the remaining battery cell assemblies are arranged in parallel with the temperature sensing circuit in which the early warning component is arranged.

7. The battery pack according to claim 6, characterized in that: The early warning component includes a buzzer, and the buzzer emits an alarm sound signal based on the thermal voltage.

8. The battery pack according to claim 6, characterized in that: The early warning component includes a battery management system, which is electrically connected to the temperature-sensitive layer of each battery cell assembly and is used to issue an alarm message according to the thermal voltage of the corresponding temperature-sensitive layer.

9. The battery pack according to claim 8, characterized in that: It also includes a converter, which is electrically connected to the battery management system. The battery management system transmits signals to the wireless communication module through the converter, and the wireless communication module transmits the signals to the terminal.

10. An electrical device, characterized in that: It comprises a device body and a battery pack according to any one of claims 5 to 9, wherein the battery pack is arranged on the device body.

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