Detection device, battery cell, battery pack and electric equipment

Abstract

The utility model relates to a detection device, a battery cell, a battery pack and electric equipment, the detection device comprises an insulating part, the insulating part is suitable for being connected with the battery cell, the insulating part is provided with a first through hole, and the first through hole is suitable for corresponding to an explosion-proof valve of the battery cell; the thermal runaway wire is arranged on the insulating part, the insulating part wraps the thermal runaway wire, and at least part of the thermal runaway wire is located in the first through hole; the thermal runaway wire is provided with a detection end, and the detection end is used for being connected with a detection element so that the detection element can detect the voltage change of the thermal runaway wire. The detection device has the advantages that signals are reliable, and thermal runaway detection is more timely and accurate.

Description

Technical Field

[0001] The present application relates to the technical field of battery devices, and in particular to a detection device, a battery cell, a battery pack and an electrical device. Background Art

[0002] At present, with the promotion of new energy technologies, the application of power batteries is becoming more and more popular, and the market demand for battery safety is getting higher and higher. During the use of power batteries, the temperature may rise sharply due to internal or external factors, resulting in thermal runaway, which may burn through the battery box cover and catch fire, causing great safety accidents. In order to detect thermal runaway in time, the battery is often equipped with a thermal runaway detection device to detect the thermal runaway state of the battery.

[0003] In related technologies, temperature collection is often used for detection. When the internal temperature of the battery is detected to rise rapidly, it is reflected to the entire system to alarm. However, this method is likely to produce false signals, resulting in untimely thermal runaway detection and causing safety accidents. Utility Model Content

[0004] The present application is proposed to solve the above-mentioned problem. According to one aspect of the present application, a detection device is provided, comprising: an insulating member, the insulating member is suitable for being connected to a battery cell, the insulating member is provided with a first through hole, the first through hole is suitable for corresponding to the explosion-proof valve of the battery cell; a thermal runaway wire, the thermal runaway wire is provided on the insulating member, wherein the insulating member covers the thermal runaway wire and at least part of the thermal runaway wire is located in the first through hole; the thermal runaway wire has a detection end, the detection end is used to connect a detection element so that the detection element detects the voltage change of the thermal runaway wire.

[0005] Exemplarily, the thermal runaway wire includes a first wire and a second wire; one end of the first wire and one end of the second wire both have the detection end, the detection end is suitable for connecting the detection element, and the other end of the first wire and the other end of the second wire are connected and located in the insulating member.

[0006] Exemplarily, at least one of the first conductive wire and the second conductive wire is bent in the insulating member.

[0007] Exemplarily, at least one of the first conductive line and the second conductive line comprises a first bending portion and a second bending portion, and an extension direction of the first bending portion and an extension direction of the second bending portion have a preset angle, wherein at least a connection between the first bending portion and the second bending portion is located in the first through hole.

[0008] Exemplarily, the device further comprises a detection element, which is connected to a detection end of the thermal runaway wire.

[0009] Exemplarily, the detection element includes a voltage collection element, the device also includes a power supply, the power supply is electrically connected to the thermal runaway wire, and the voltage collection element is connected to the detection end of the thermal runaway wire to collect the voltage of the thermal runaway wire.

[0010] Exemplarily, the detection element further includes a resistor, and the thermal runaway wire is connected in series with the resistor and then electrically connected to the power supply.

[0011] Exemplarily, the device further comprises a plug, wherein the plug is fixedly connected to a detection end of the thermal runaway wire, and the detection end is connected to the detection element via the plug.

[0012] Exemplarily, the device further comprises an alarm element, which is electrically connected to the detection element, and the alarm element is suitable for giving an alarm according to a voltage change of the thermal runaway wire detected by the detection element.

[0013] Exemplarily, the insulating member includes a first insulating film and a second insulating film, and the thermal runaway wire is arranged between the first insulating film and the second insulating film.

[0014] Exemplarily, the diameter of the thermal runaway wire is 0.05-0.15 mm.

[0015] Exemplarily, the insulating member is further provided with a second through hole, and the second through hole is arranged corresponding to the pole of the battery cell.

[0016] According to another aspect of the present application, a battery cell is provided, on which the above-mentioned detection device is arranged, and a first through hole in the detection device is arranged corresponding to the explosion-proof valve of the battery cell.

[0017] According to another aspect of the present application, a battery pack is provided, comprising the above-mentioned battery cell.

[0018] According to another aspect of the present application, an electric device is provided, wherein the electric device includes the above-mentioned battery pack.

[0019] The detection element in the present application reflects the thermal runaway state of the battery cell through the thermal runaway wire and the detection element. The insulating member is used to fix the thermal runaway wire on the battery cell and only expose part of the thermal runaway wire through the first through hole. When the temperature of the battery cell is too high, it will break through the explosion-proof valve. The thermal runaway wire in the through hole corresponding to the explosion-proof valve will break due to the impact, changing the voltage of the thermal runaway wire, so that the detection element can detect the voltage change and thus detect the thermal runaway state of the battery cell. The exposed thermal runaway wire corresponds to the explosion-proof valve through the first through hole, and the thermal runaway wire will be impacted only when the explosion-proof valve breaks, so the detection of the detection element is more reliable. In addition, the insulation member covering the thermal runaway wire can also avoid the problem of the thermal runaway wire being damaged due to other problems, thereby ensuring that the thermal runaway state of the battery cell is detected only by the breakage of the thermal runaway wire at the first through hole, thereby improving the detection accuracy. The thermal runaway wire in the present application will break at the moment the explosion-proof valve breaks, so that the detection can be carried out in time, which has the effect of more timely and accurate detection of the thermal runaway state of the battery cell, and can improve the safety of battery use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0021] Figure 1 A schematic diagram showing the cooperation between the detection device and the battery in the embodiment of the present application is shown.

[0022] Figure 2 An exploded view of a detection device in an embodiment of the present application is shown.

[0023] Figure 3 A schematic diagram of the structure of the insulating component and the thermal runaway wiring harness in an embodiment of the present application is shown.

[0024] Figure 4 Shows Figure 3 Enlarged view of part A.

[0025] Figure 5 The schematic diagram of the circuit of the detection device in the embodiment of the present application is shown.

[0026] Figure numerals: 1, insulating part; 11, first insulating film; 12, second insulating film; 2, thermal runaway wire; 21, first wire; 22, second wire; 23, insulating wire harness; 3, first through hole; 4, plug; 5, battery cell; 51, housing; 52, battery cover; 53, explosion-proof valve. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present application more obvious, the example embodiments according to the present application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the example embodiments described herein. Based on the embodiments of the present application described in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0028] like Figure 1 As shown, the embodiment of the present application provides a detection device, including: an insulating member 1, a thermal runaway wire 2 and an alarm element. Among them:

[0029] The insulating member 1 is connected to the battery cell 5, and a first through hole 3 is provided on the insulating member 1, and the first through hole 3 corresponds to the explosion-proof valve 53 of the battery cell 5. The thermal runaway wire 2 is provided on the insulating member 1. The insulating member 1 covers the thermal runaway wire 2, and part of the thermal runaway wire 2 is located in the first through hole 3.

[0030] The thermal runaway wire 2 is connected to a detection end, and the detection end is used to connect a detection element so that the detection element detects the voltage change of the thermal runaway wire.

[0031] The detection element in the present application reflects the thermal runaway state of the battery cell through the thermal runaway wire 2 and the detection element. The insulating member 1 is used to fix the thermal runaway wire 2 on the battery cell 5 and expose at least part of the thermal runaway wire 2 through the first through hole 3. When the temperature of the battery cell is too high, the explosion-proof valve 53 will be broken. The thermal runaway wire 2 in the first through hole 3 corresponding to the explosion-proof valve 53 will break due to the impact, changing the voltage of the thermal runaway wire 2, so that the detection element can detect the voltage change and thus detect the thermal runaway state of the battery cell 5. The exposed thermal runaway wire 2 will only correspond to the explosion-proof valve 53 through the first through hole 3, and the thermal runaway wire will be impacted when the explosion-proof valve 53 breaks, so the detection of the detection element is more reliable. In addition, the insulation member 1 covering the thermal runaway wire 2 can also avoid the problem of the thermal runaway wire 2 being damaged due to other problems, thereby ensuring that the thermal runaway state of the battery cell is detected only by the breakage of the thermal runaway wire 2 at the first through hole 3, thereby improving the detection accuracy. The thermal runaway wire in the present application will break at the moment the explosion-proof valve 53 ruptures, so that timely detection can be performed, which has the effect of more timely and accurate detection of the thermal runaway state of the battery cell 5, and can improve the safety of battery use.

[0032] For example, Figure 2As shown, the insulating member 1 includes a first insulating film 11 and a second insulating film 12, the first insulating film 11 is bonded to the battery cell 5, the second insulating film 12 is bonded to the first insulating film 11, and the thermal runaway wire 2 is arranged between the first insulating film 11 and the second insulating film 12. Among them, the first insulating film 11 can be fixed on the battery cell 5 by hot pressing or bonding, and the second insulating film 12 is bonded to the first insulating film 11, so as to achieve the fixation of the thermal runaway wire 2. The first insulating film 11 and the second insulating film 12 are both provided with a first through hole 3, so as to avoid the explosion-proof valve 53 of the battery cell 5, and when the explosion-proof valve 53 is broken, the thermal runaway wire 2 is quickly impacted, so that the wire breaks. Among them, the first insulating film 11 and the second insulating film 12 can be made of plastic material, such as prepared by materials such as PI (polyimide) or PET (polyethylene terephthalate).

[0033] Exemplarily, the diameter of the thermal runaway wire 2 in the embodiment of the present application is relatively small, which is 0.05-0.15mm. Specifically, a die-cutting / etching process can be used to make it have a smaller diameter. The thermal runaway wire 2 can use metals with relatively low tensile strength, including but not limited to tin, aluminum and related alloys, etc., which have weak strength on the basis of conductive properties, and can break quickly due to impact when the explosion-proof valve 53 is broken. Compared with traditional air pressure sensors, aerosol sensors and the like, the structural design is simpler and the cost is lower. Among them, the outside of the thermal runaway wire 2 can be coated with an insulating layer, so that the bent thermal runaway wire 2 itself is less likely to short-circuit.

[0034] like Figure 1 As shown, in addition to the first through hole 3 corresponding to the explosion-proof valve 53, the insulating member 1 is also provided with a plurality of holes to cooperate with the battery cell to avoid the pole and other structures on the battery cell 5. Exemplarily, the insulating member 1 is also provided with a second through hole, and the second through hole is provided corresponding to the pole of the battery cell 5.

[0035] Exemplarily, the above detection device is provided on each battery cell 5. The battery comprises a plurality of stacked battery cells 5. In some embodiments, only one detection device may be provided on a battery module composed of a plurality of battery cells 5, which makes installation simpler and can also control costs more reasonably and effectively.

[0036] like Figure 2-Figure 4As shown, exemplarily, the thermal runaway wire 2 includes a first wire 21 and a second wire 22, the first end of the first wire 21 and the first end of the second wire 22 are located outside the insulating member 1 and serve as the detection end, and the second end of the first wire 21 and the second end of the second wire 22 are connected and located inside the insulating member 1. Exemplarily, the second ends of the first wire 21 and the second wire 22 can be located at the edge of the insulating member 1 in the length direction. Exemplarily, the second ends of the first wire 21 and the second wire 22 are integrally formed and connected together. The first end of the first wire 21 and the first end of the second wire 22 are insulated from each other after being connected by the insulating wire bundle 23.

[0037] For example, at least one of the first wire 21 and the second wire 22 is bent in the insulating member 1 to increase the length of the thermal runaway wire 2 .

[0038] Further, at least one of the first wire and the second wire includes a first bend portion and a second bend portion, and there is a preset angle between the extension direction of the first bend portion and the extension direction of the second bend portion, wherein at least the connection between the first bend portion and the second bend portion is located in the through hole. Specifically, taking the first wire as an example below, the first wire is connected with the first bend portion and the second bend portion to achieve the bending of the first wire, and at least the connection between the first bend portion and the second bend portion is located in the first through hole, which can increase the length of the first wire in the first through hole to improve the timeliness of detection.

[0039] The thermal runaway wire 2 can be bent and arranged in the insulating member 1 through the above-mentioned structural arrangement, and ensure that a sufficient portion is located in the first through hole 3, so that when the gas impacts the first through hole 3, the thermal runaway wire 2 can be broken smoothly, so that the detection element detects the voltage change. Exemplarily, the first through hole 3 on the insulating member 1 can be in a rectangular or elliptical shape, with a clear length and width direction. The bent portion of the thermal runaway wire 2 is located at the first through hole 3, so that more portions of the thermal runaway wire 2 are located in the first through hole 3, and are more easily impacted and broken when the explosion-proof valve 53 ruptures.

[0040] Exemplarily, the device further includes a detection element, which is connected to the detection end of the thermal runaway wire. The detection device further includes a plug 4, which is fixedly connected to the detection end of the thermal runaway wire 2, the connection terminal on the plug 4 is electrically connected to the first end of the first wire 21 and the second wire 22, and the detection end is electrically connected to the detection element through the plug 4.

[0041] like Figure 5As shown, the detection element includes a voltage collection element, the detection device also includes a power supply, the thermal runaway wire is electrically connected to the power supply, the power supply and the thermal runaway wire are electrically connected, and the voltage collection element and the thermal runaway wire are electrically connected to collect the voltage of the thermal runaway wire. The voltage collection element is also connected to an alarm element, and when the voltage collected by the voltage collection element is 0, a disconnection signal is sent to the alarm element to cause the alarm element to alarm.

[0042] Exemplarily, the detection element further includes a resistor, which is connected in series with the thermal runaway wire and then electrically connected to the power supply. The resistor is mainly used to reduce the current in the circuit to reduce the overall power.

[0043] Exemplarily, the resistor includes a first resistor R1 and a second resistor R2, and the first resistor R1, the second resistor R2 and the thermal runaway wire 2 are connected in series. The thermal runaway wire 2 is connected between the two resistors. Exemplarily, the power supply is a chip reference power supply, the voltage of the power supply is 2.5-5V, and the resistance of the first resistor R1 and the second resistor R2 is 180-250 kilo-ohms. Specifically, the voltage of the power supply is 3.3V, the resistance of the first resistor R1 and the second resistor R2 is 200 kilo-ohms, the current in the loop is low, and thermal failure is not prone to occur. Moreover, because the voltage and current are relatively low, the entire loop consumes very little electrical energy, such as 3.3V / 400KΩ=8.25μA, and the power consumption of the entire circuit is low, so that the power supply can provide electrical energy for a long time. In some embodiments, only one resistor with a larger resistance value can be connected in series in the loop.

[0044] In some embodiments, the plug 4 may be connected to a battery management system (BMS) and powered by a chip power supply in the battery management system.

[0045] The voltage collection element is electrically connected to the thermal runaway wire 2 to collect the voltage of the wire. For example, the voltage at the rear end of the thermal runaway wire 2 can be detected. For example, the voltage collection element is an analog front end (Analog Front End, referred to as AFE), which is part of the battery management system and can collect multiple data.

[0046] When the circuit is normal, the voltage signal collected by the voltage collection element should be within a certain range. When the thermal runaway wire 2 is disconnected, the voltage signal collected by the voltage collection element is 0, and then a disconnection signal is sent to the alarm element, so that the alarm element alarms. Exemplarily, the alarm element can be an alarm device such as a buzzer. Among them, the voltage collection element and the buzzer can be installed on the battery housing and electrically connected to the battery cell 5, so that the power is supplied by the battery without consuming the power of the above power supply.

[0047] The installation and working principle of the detection device in the embodiment of the present application are as follows: the thermal runaway wire 2 is arranged inside the insulating member 1, and the thermal runaway wire 2 is bent, one end of the thermal runaway wire 2 is located at the inner edge of the insulating member 1, and the other end is located outside the insulating member 1 and connected to the insulating harness 23 and the plug 4. The insulating member 1 is installed on the battery, the insulating member 1 and the battery cell 5 are bonded, and the first through hole 3 on the insulating member 1 corresponds to the explosion-proof valve 53 of the battery cell 5. The plug 4 is connected to the battery management system to form a power-on circuit.

[0048] During use, if the battery temperature rises sharply and causes thermal runaway, it will act on the explosion-proof valve 53, causing the explosion-proof valve 53 to break, and the high-temperature and high-pressure gas will impact the thermal runaway wire 2, causing the thermal runaway wire 2 with a very small diameter to break. The voltage collected by the voltage collection unit becomes 0, and a disconnection signal is sent to the alarm component, which issues an alarm based on the disconnection signal.

[0049] The detection element in the present application reflects the thermal runaway state of the battery cell through the thermal runaway wire 2 and the detection element. The insulating member 1 is used to fix the thermal runaway wire 2 on the battery cell 5 and only exposes part of the thermal runaway wire 2 through the first through hole 3. When the temperature of the battery cell is too high, the explosion-proof valve 53 will be broken. The thermal runaway wire 2 in the first through hole 3 corresponding to the explosion-proof valve 53 will break due to the impact, changing the voltage of the thermal runaway wire 2, so that the detection element can detect the voltage change and thus detect the thermal runaway state of the battery cell 5. The exposed thermal runaway wire 2 will only correspond to the explosion-proof valve 53 through the first through hole 3, and will impact the thermal runaway wire when the explosion-proof valve 53 breaks, so the detection of the detection element is more reliable. The thermal runaway wire in the present application will break at the moment the explosion-proof valve 53 breaks, so that the detection can be carried out in time, which has the effect of more timely and accurate detection of the thermal runaway state of the battery cell 5, and can improve the safety of battery use.

[0050] like Figure 1 As shown, the embodiment of the present application also provides a battery cell, and the above-mentioned detection device is arranged on the battery cell 5. The battery cell 5 includes a shell 51, a battery cover 52 arranged on the shell 51, and an explosion-proof valve 53. The explosion-proof valve 53 is arranged on the battery cover 52, and the insulating member 1 of the detection device is bonded to the battery cover 52. A pole is also arranged on the cover of the battery cell 5. In addition to the first through hole 3 that cooperates with the explosion-proof valve 53, the insulating member 1 is also provided with a second through hole, and the second through hole is arranged corresponding to the pole of the battery cell.

[0051] The embodiments of the present application also provide a battery pack and an electrical device, wherein the battery pack includes the above-mentioned battery, and the electrical device includes the above-mentioned battery pack.

[0052] The battery, battery pack and electrical equipment in the embodiment of the present application use the above-mentioned detection element to detect the thermal runaway state, and the thermal runaway state of the battery cell is reflected by the thermal runaway wire 2 and the detection element. The insulating member 1 is used to fix the thermal runaway wire 2 on the battery cell 5 and only expose part of the thermal runaway wire 2 through the first through hole 3. When the temperature of the battery cell is too high, it will break through the explosion-proof valve 53. The thermal runaway wire 2 in the first through hole 3 corresponding to the explosion-proof valve 53 will break due to the impact, changing the voltage of the thermal runaway wire 2, so that the detection element can detect the voltage change and thus detect the thermal runaway state of the battery cell 5. The exposed thermal runaway wire 2 will only correspond to the explosion-proof valve 53 through the first through hole 3, and will impact the thermal runaway wire when the explosion-proof valve 53 breaks, so the detection of the detection element is more reliable. The thermal runaway wire in the present application will break at the moment the explosion-proof valve 53 breaks, so that the detection can be carried out in time, which has the effect of more timely and accurate detection of the thermal runaway state of the battery cell 5. After the thermal runaway state is detected, the alarm component can be used to give a timely alarm, which can improve the safety of battery use.

[0053] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0054] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0055] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various inventive aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the inventive point is that the corresponding technical problem can be solved with features less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0056] It will be understood by those skilled in the art that, except for mutually exclusive features, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this specification may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature that provides the same, equivalent or similar purpose.

[0057] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments may be used in any combination.

[0058] The above is only a specific implementation or description of a specific implementation of the present application, and the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A detection device, characterized in that: include: An insulating member, the insulating member is suitable for being connected to the battery core, the insulating member is provided with a first through hole, and the first through hole is suitable for corresponding to the explosion-proof valve of the battery core; A thermal runaway wire, wherein the thermal runaway wire is arranged on the insulating member, wherein the insulating member covers the thermal runaway wire and at least a portion of the thermal runaway wire is located in the first through hole; The thermal runaway wire has a detection end, and the detection end is used to connect a detection element so that the detection element detects a voltage change of the thermal runaway wire.

2. The detection device according to claim 1, characterized in that: The thermal runaway wire comprises a first wire and a second wire; One end of the first wire and one end of the second wire both have the detection end, and the detection end is suitable for connecting the detection element. The other end of the first wire and the other end of the second wire are connected and located in the insulating member.

3. The detection device according to claim 2, characterized in that: At least one of the first conductive wire and the second conductive wire is bent in the insulating member.

4. The detection device according to claim 3, characterized in that: At least one of the first conductive line and the second conductive line comprises a first bending portion and a second bending portion, and an extension direction of the first bending portion and an extension direction of the second bending portion have a preset angle therebetween, wherein at least a connection point between the first bending portion and the second bending portion is located in the first through hole.

5. The detection device according to claim 1, characterized in that: The device further comprises a detection element, which is connected to the detection end of the thermal runaway wire.

6. The detection device according to claim 5, characterized in that: The detection element includes a voltage collection element, and the device also includes a power supply, which is electrically connected to the thermal runaway wire. The voltage collection element is connected to the detection end of the thermal runaway wire to collect the voltage of the thermal runaway wire.

7. The detection device according to claim 6, characterized in that: The detection element further includes a resistor, and the thermal runaway wire is connected in series with the resistor and then electrically connected to the power supply.

8. The detection device according to any one of claims 1 to 7, characterized in that: The device further comprises a plug, wherein the plug is fixedly connected to the detection end of the thermal runaway wire, and the detection end is connected to the detection element through the plug.

9. The detection device according to any one of claims 1 to 7, characterized in that: The device further comprises an alarm element, which is electrically connected to the detection element and is suitable for giving an alarm according to a voltage change of the thermal runaway wire detected by the detection element.

10. The detection device according to any one of claims 1 to 7, characterized in that: The insulating member includes a first insulating film and a second insulating film, and the thermal runaway wire is disposed between the first insulating film and the second insulating film.

11. The detection device according to any one of claims 1 to 7, characterized in that: The diameter of the thermal runaway wire is 0.05-0.15 mm.

12. The detection device according to any one of claims 1 to 7, characterized in that: The insulating member is further provided with a second through hole, and the second through hole is arranged corresponding to the pole of the battery cell.

13. A battery cell, characterized in that: The battery cell is provided with a detection device as described in any one of claims 1 to 12, and the first through hole in the detection device is provided corresponding to the explosion-proof valve of the battery cell.

14. A battery pack, characterized in that: The battery pack comprises the battery cell according to claim 13.

15. An electrical equipment, characterized in that: The electrical device comprises the battery pack as claimed in claim 14.

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