Battery thermal runaway detection structure, battery and energy storage device
By designing the detection circuit and varistor mechanism on the battery module, the false alarm problem caused by sensor failure during thermal runaway of the battery is solved, and a more stable and reliable thermal runaway detection is achieved.
Patent Information
- Application Number
- CN202421798920.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-06-06
- Estimated Expiration
- 2034-07-26
AI Technical Summary
In the prior art, when the battery is thermally out of control, the front-end acquisition sensor is prone to failure, resulting in false alarms of thermally out of control failure.
A battery thermal runaway detection structure is designed. By installing the first line and the second line on the opposite sides of the battery module, and forming a detection circuit using a varistor mechanism, when the battery is thermally runaway, the resistance value of the varistor mechanism changes can be used to judge the thermal runaway fault.
This detection structure uses a separate detection circuit to completely use hardware lines to detect thermal runaway faults, which is more stable and reliable, reducing the possibility of fault false alarms.
Smart Images
Figure CN222953331U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a battery thermal runaway detection structure, a battery, and an energy storage device. Background Art
[0002] New energy vehicles are developing in full swing and are gradually replacing fuel vehicles in people's lives. With the increasing maturity of technology, the safety of new energy vehicles has always been a concern of the public. The biggest safety hazard of electric vehicles is the thermal runaway of the battery. Once thermal runaway occurs, if it cannot be discovered and handled in time, the consequences will be disastrous. Therefore, many OEMs have formulated relevant thermal runaway inspection logic to determine whether thermal runaway has occurred by reading relevant information such as the voltage, temperature, and pressure inside the battery cell.
[0003] The current general method of judging thermal runaway is to judge the value and change rate of the voltage, temperature, and pressure inside the battery pack. The collection of this information relies on some front-end sensors. For example, the collection of the voltage and temperature of the battery cell is generally carried out next to the battery cell in the module. Once thermal runaway occurs, these front-end collections are likely to fail, resulting in false alarms of thermal runaway faults. Utility Model Content
[0004] The present application provides a battery thermal runaway detection structure, a battery and an energy storage device, which are used to solve the problem in the prior art that when the battery is thermally runaway, the front-end acquisition sensor will fail and false alarms of thermal runaway faults will occur.
[0005] On the one hand, the present application provides a battery thermal runaway detection structure, comprising:
[0006] A first circuit has a first end and a second end, the first end is arranged at an end surface of the battery module, and the first end can be electrically connected to an input end of the battery management system;
[0007] The second circuit has a third end and a fourth end, the fourth end is arranged at the other end surface of the battery module, the fourth end is arranged opposite to the first end, and the fourth end can be electrically connected to the output end of the battery management system;
[0008] The variable resistance mechanism is used to connect the second end and the third end. The first circuit, the variable resistance mechanism, the second circuit and the battery management system are electrically connected in sequence to form a detection loop. The resistance value of the variable resistance mechanism connected to the detection loop can be changed by changing the distance between the second end and the third end.
[0009] In one possible design, the variable resistance mechanism includes:
[0010] a variable resistance part connected to the second end;
[0011] The connecting part is connected to the third end, and the connecting part and the variable resistance part are slidably matched. The connecting part slides on the surface of the variable resistance part to change the resistance value of the variable resistance part connected to the detection circuit.
[0012] In a possible design, the connection portion forms a limiting groove, the groove opening of the limiting groove faces the variable resistance portion, the variable resistance portion is arranged in the limiting groove, and the variable resistance portion can move along the groove depth direction of the limiting groove.
[0013] In a possible design, a contact body is protruding from the inner side wall of the limiting groove, and the contact body is slidably connected to the surface of the variable resistance part.
[0014] In a possible design, the variable resistance part includes a resistor body and a conductor, and the resistor body and the conductor are arranged at intervals along a preset direction, and the preset direction is the length direction of the first circuit.
[0015] In a possible design, the first circuit includes a first insulating core, a first conductive layer and a first insulating layer, and the first insulating core, the first conductive layer and the first insulating layer are arranged in sequence from the center of the first circuit to the outer surface of the first circuit along the radial direction of the first circuit;
[0016] And / or, the second circuit includes a second insulating core, a second conductive layer and a second insulating layer, and the second insulating core, the second conductive layer and the second insulating layer are arranged in sequence from the center of the second circuit to the outer surface of the second circuit along the radial direction of the second circuit.
[0017] In a possible design, the varistor portion has a connection hole, the connection hole passes through the varistor portion along the length direction of the first line, and the first insulating core is inserted into the connection hole.
[0018] In a possible design, an insulating sheet is further included. The insulating sheet is arranged at a position of the varistor away from the second end, and the insulating sheet is connected to the first insulating core.
[0019] On the other hand, the present application also provides a battery, comprising the battery thermal runaway detection structure as described above.
[0020] On the other hand, the present application also provides an energy storage device, comprising the battery as described above.
[0021] The beneficial effects of this application are as follows:
[0022] The battery thermal runaway detection structure of the present application has a first circuit, a second circuit and a variable resistance mechanism, and the first circuit, the variable resistance mechanism, the second circuit and the battery management system are electrically connected in sequence to form a detection loop; by installing the first end of the first circuit and the fourth end of the second circuit on opposite sides of the module, when the battery thermal runaway occurs and the battery cell expands and bulges, the first end of the first circuit and the fourth end of the second circuit are relatively far away, driving the second end of the first circuit and the third end of the second circuit to be relatively far away, and at the same time, the resistance value of the variable resistance mechanism connected to the detection loop between the second end and the third end will also change with the change of the distance between the second end and the third end, so that the battery management system can judge whether the battery has a thermal runaway fault and the fault level of the battery thermal runaway according to the resistance value of the detection loop collected. Compared with the prior art that judges thermal runaway by the battery cell voltage and temperature signal collected by the front-end sensor, the battery thermal runaway detection structure of the present application uses a separate detection loop and completely utilizes the hardware circuit to detect thermal runaway faults, which is more stable and reliable and is not prone to false fault alarms.
[0023] The battery provided in the present application includes the battery thermal runaway detection structure in the present application, and thus also includes all the above-mentioned advantages of the battery thermal runaway detection structure.
[0024] The energy storage device provided in the present application includes the battery in the present application, and thus includes all the above-mentioned advantages of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0026] Figure 1 A schematic diagram of the structure of a battery thermal runaway detection structure provided in an embodiment of the present application;
[0027] Figure 2 A schematic structural diagram of a variable resistance mechanism of a battery thermal runaway detection structure provided in an embodiment of the present application in a normal state;
[0028] Figure 3 A schematic structural diagram of a variable resistance mechanism of a battery thermal runaway detection structure provided in an embodiment of the present application in a thermal runaway state;
[0029] Figure 4 This is an assembly diagram of the battery thermal runaway detection structure provided in an embodiment of the present application on a battery module.
[0030] Reference numerals:
[0031] 100, first circuit; 110, first end; 120, second end; 130, first bending section; 140, first insulating core; 150, first conductive layer; 160, first insulating layer;
[0032] 200, second circuit; 210, third end; 220, fourth end; 230, second bending section; 240, second insulating core; 250, second conductive layer; 260, second insulating layer;
[0033] 300, variable resistance mechanism; 310, variable resistance part; 311, resistor body; 3111, first resistor; 3112, second resistor; 312, conductor; 3121, first conductor; 3122, second conductor; 3123, third conductor; 313, insulating sheet; 320, connecting part; 321, limiting groove; 322, contact body;
[0034] 400. Battery module. DETAILED DESCRIPTION
[0035] The technical solution of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0036] Combine the following Figure 1-Figure 3 , describing the battery thermal runaway detection structure provided in an embodiment of the present application.
[0037] Reference Figure 1 As shown, the battery thermal runaway detection structure includes a first circuit 100, a second circuit 200 and a variable resistance mechanism 300, the first circuit 100 has a first end 110 and a second end 120, the first end 110 is arranged on one end surface of the battery module 400, and the first end 110 can be electrically connected to the input end of the battery management system; the second circuit 200 has a third end 210 and a fourth end 220, the fourth end 220 is arranged on the other end surface of the battery module 400, the fourth end 220 is arranged opposite to the first end 110, and the fourth end 220 can be electrically connected to the output end of the battery management system; the variable resistance mechanism 300 is used to connect the second end 120 and the third end 210, the first circuit 100, the variable resistance mechanism 300, the second circuit 200 and the battery management system are electrically connected in sequence to form a detection loop, and the resistance value of the variable resistance mechanism 300 connected to the detection loop can be changed by changing the distance between the second end 120 and the third end 210.
[0038] Reference Figure 4As shown, the battery module 400 includes a plurality of cells arranged in parallel with each other. When the battery has thermal runaway, the internal cells expand or even bulge. Since the cells are arranged in parallel inside the battery module 400, the expansion and bulging of the cells will directly cause the battery module 400 to become wider as a whole, that is, the distance between the two oppositely arranged end faces of the battery module 400 will increase. Therefore, in some specific embodiments, the length direction of the first circuit 100 and the second circuit 200 is parallel to the arrangement direction of the cells, the first end 110 of the first circuit 100 is fixed to the left end face of the battery module 400, the fourth end 220 of the second circuit 200 is fixed to the right end face of the battery module 400, and the second end 120 of the first circuit 100 is connected to the third end 210 of the second circuit 200 through the variable resistance mechanism 300. In this way, when the battery has thermal runaway, the second end 120 and the third end 210 are away from each other, so that the resistance value of the variable resistance mechanism 300 connected to the detection circuit changes, thereby realizing thermal runaway detection. In some specific embodiments, a first bending section 130 is formed at a position of the first circuit 100 near the first end 110, and the first bending section 130 is fixed to the left end surface of the battery module 400, for example, by bonding or a slot; a second bending section 230 is formed at a position of the second circuit 200 near the fourth end 220, and the second bending section 230 is fixed to the right end surface of the battery module 400, for example, by bonding or a slot; in this way, by connecting the first bending section 130 and the second bending section 230 to two opposite end surfaces of the battery module 400 respectively, it is beneficial to improve the connection firmness between the first circuit 100, the second circuit 200 and the two opposite end surfaces of the battery module 400, and ensure that when the battery has thermal runaway, the increase in the distance between the two oppositely arranged end surfaces of the battery module 400 can smoothly drive the second end 120 and the third end 210 to move away from each other.
[0039] By using the technical solution of the above-mentioned embodiment of the present application, the first circuit 100, the variable resistance mechanism 300, the second circuit 200 and the battery management system are electrically connected in sequence to form a detection circuit, and the first end 110 of the first circuit 100 and the fourth end 220 of the second circuit 200 are respectively installed on opposite sides of the module. When the battery has thermal runaway and the battery cell expands and bulges, the first end 110 of the first circuit 100 and the fourth end 220 of the second circuit 200 are relatively far away from each other, driving the second end 120 of the first circuit 100 and the third end 210 of the second circuit 200 to be relatively far away from each other. At the same time, the resistance value of the variable resistance mechanism 300 connected to the detection circuit between the second end 120 and the third end 210 will also change with the change of the distance between the second end 120 and the third end 210, so that the battery management system can judge whether the battery has a thermal runaway fault and the fault level of the thermal runaway of the battery according to the collected resistance value of the detection circuit. Compared with the prior art that determines thermal runaway by collecting battery cell voltage and temperature signals from front-end sensors, the battery thermal runaway detection structure of the present application uses a separate detection loop and completely utilizes hardware circuits to detect thermal runaway faults, which is more stable and reliable and less prone to false fault alarms.
[0040] Reference Figure 3 As shown, in some embodiments provided in the present application, the variable resistance mechanism 300 includes a variable resistance part 310 and a connecting part 320, the variable resistance part 310 is connected to the second end 120, the connecting part 320 is connected to the third end 210, the connecting part 320 and the variable resistance part 310 are slidably matched, and the connecting part 320 slides on the surface of the variable resistance part 310 to change the resistance value of the variable resistance part 310 connected to the detection circuit. In some specific embodiments, the connecting part 320 and the variable resistance part 310 are slidably matched along the length direction of the first circuit 100 through the structure of the shaft and the ring matching, and the variable resistor includes a resistance wire wound by a plurality of turns of spirals, and when the connecting part 320 moves on the outer surface of the resistance wire, the length of the resistance wire connected to the detection circuit of the variable resistance part 310 can be changed, thereby changing the resistance value of the variable resistance part 310 connected to the detection circuit. When the battery has thermal runaway, the second end 120 and the third end 210 are away from each other, so that the resistance value of the variable resistance part 310 connected to the detection circuit changes, thereby realizing the detection of thermal runaway of the battery.
[0041] Reference Figure 3As shown, in some embodiments provided in the present application, the connection portion 320 forms a limiting groove 321, the notch of the limiting groove 321 faces the variable resistor portion 310, the variable resistor portion 310 is arranged in the limiting groove 321, and the variable resistor portion 310 can move along the groove depth direction of the limiting groove 321. Specifically, the limiting groove 321 is a cylindrical groove, the variable resistor portion 310 is a cylindrical structure as a whole, the outer diameter of the variable resistor portion 310 is smaller than the inner diameter of the cylindrical groove, and the variable resistor portion 310 can move along the groove depth direction in the limiting groove 321. In this way, on the one hand, the cylindrical groove can limit the variable resistor portion 310. Under normal conditions, the variable resistor portion 310 is arranged in the cylindrical groove, so that the first circuit 100 and the second circuit 200 are smoothly connected; on the other hand, the cylindrical groove can protect the variable resistor portion 310 in the groove to prevent the variable resistor portion 310 from being directly exposed and causing leakage.
[0042] Reference Figure 3 As shown, in some embodiments provided in the present application, the inner side wall of the limiting groove 321 is protrudingly provided with a contact body 322, and the contact body 322 is slidably connected to the surface of the variable resistor part 310. Specifically, the contact body 322 is arranged at the inner side wall of the limiting groove 321 close to the notch. In the normal state of the battery, the left end of the variable resistor part 310 is connected to the contact body 322. At this time, the resistance value of the variable resistor part 310 connected to the detection circuit is the smallest; when the battery is thermally runaway, the variable resistor part 310 will move away from the limiting groove 321 to the left, and the resistance value of the variable resistor part 310 connected to the detection circuit will increase.
[0043] Reference Figure 3As shown, in some embodiments provided in the present application, the variable resistance part 310 includes a resistor body 311 and a conductor 312, and the resistor body 311 and the conductor 312 are arranged at intervals along a preset direction, and the preset direction is the length direction of the first circuit 100. In some specific embodiments, the resistor body 311 can be a carbon film resistor, a metal film resistor, a wire-wound resistor, etc., and the conductor 312 can be a copper block, a copper wire, etc. In some specific embodiments, the resistor body 311 includes three, namely the first resistor 3111 and the second resistor 3112; the conductor 312 includes two, namely the first conductor 3121, the second conductor 3122 and the third conductor 3123; along the length direction of the first circuit 100 (from left to right), respectively, are the first conductor 3121, the first resistor 3111, the second conductor 3122, the second resistor 3112 and the third conductor 3123; in the normal state of the battery, the first conductor 3121 is connected to the contact body 322, at this time ... The first resistor 3111 and the second resistor 3112 are not connected to the detection circuit, and the resistance value of the variable resistor 310 connected to the detection circuit is the smallest; when the battery has thermal runaway, the variable resistor 310 moves to the left, so that the first resistor 3111 or the second conductor 3122 or the second resistor 3112 or the third conductor 3123 is connected to the contact body 322, and correspondingly, the resistance value of the variable resistor 310 connected to the detection circuit is also different (the resistance value gradually increases). Based on this, the degree of thermal runaway can also be judged according to the size of the resistance value of the variable resistor 310 connected to the detection circuit. In other embodiments, multi-level detection of the degree of thermal runaway can be achieved by increasing the number of resistor bodies 311 and conductors.
[0044] Reference Figure 3 As shown, in some embodiments provided in the present application, the first circuit 100 includes a first insulating core 140, a first conductive layer 150 and a first insulating layer 160, and the first insulating core 140, the first conductive layer 150, and the first insulating layer 160 are arranged in sequence from the center of the first circuit 100 to the outer surface of the first circuit 100 along the radial direction of the first circuit 100; specifically, the first insulating core 140 and the first insulating layer 160 are made of insulating material, and the first conductive layer 150 is made of conductive material; the first conductive layer 150 is coated on the outside of the first insulating core 140 for passing current; the first insulating layer 160 is coated on the outside of the first conductive layer 150 for insulation; the first insulating core 140 has the function of insulating and supporting the first conductive layer 150 and the first insulating layer 160.
[0045] The second circuit 200 includes a second insulating core 240, a second conductive layer 250, and a second insulating layer 260. The second insulating core 240, the second conductive layer 250, and the second insulating layer 260 are sequentially arranged from the center of the second circuit 200 to the outer surface of the second circuit 200 along the radial direction of the second circuit 200. Specifically, the second insulating core 240 and the second insulating layer 260 are made of insulating materials, and the second conductive layer 250 is made of conductive materials; the second conductive layer 250 is coated on the outside of the first insulating core 140 for passing current; the second insulating layer 260 is coated on the outside of the first conductive layer 150 for insulation; the second insulating core 240 has the function of insulating and supporting the second conductive layer 250 and the second insulating layer 260.
[0046] Reference Figure 3 As shown, in some embodiments provided in the present application, the varistor portion 310 has a connection hole, and the connection hole penetrates the varistor portion 310 along the length direction of the first line 100, and the first insulating core 140 is inserted into the connection hole. Specifically, the first conductor 3121, the first resistor 3111, the second conductor 3122, the second resistor 3112, and the third conductor 3123 are respectively provided with connection holes, and the first insulating core 140 passes through the connection holes on the first conductor 3121, the first resistor 3111, the second conductor 3122, the second resistor 3112, and the third conductor 3123 in sequence, and the first conductor 3121, the first resistor 3111, the second conductor 3122, the second resistor 3112, and the third conductor 3123 are fixed on the first insulating core 140.
[0047] Reference Figure 3 As shown, in some embodiments provided in the present application, the cell thermal runaway detection structure further includes an insulating sheet 313, which is disposed at a position of the varistor portion 310 away from the second end 120, and the insulating sheet 313 is connected to the first insulating core 140. By connecting the insulating sheet 313 to the first insulating core 140, the first conductor 3121, the first resistor 3111, the second conductor 3122, the second resistor 3112, and the third conductor 3123 can be more firmly fixed to the first insulating core 140.
[0048] The specific working principle of the battery thermal runaway detection structure disclosed in this application is:
[0049] Reference Figure 2 As shown, when the battery is in a normal state, the first conductor 3121 is connected to the contact body 322. At this time, the first resistor 3111 and the second resistor 3112 are not connected to the detection circuit, and the resistance value of the variable resistor 310 connected to the detection circuit is the smallest;
[0050] When the battery has thermal runaway, the variable resistor part 310 moves to the left as a whole, so that the first resistor 3111 or the second conductor 3122 or the second resistor 3112 or the third conductor 3123 is connected to the contact body 322. In the process of the variable resistor part 310 moving to the left, the resistance value of the variable resistor part 310 connected to the detection circuit gradually increases. Of course, refer to Figure 3 As shown, when the variable resistor 310 moves to the left and is completely out of contact with the contact body 322, the detection circuit is in an open circuit state, and the resistance value of the detection circuit is the largest. Therefore, the battery management system determines the degree of thermal runaway of the battery based on the collected resistance value of the variable resistor 310 connected to the detection circuit.
[0051] The present application also provides a battery, including the battery thermal runaway detection structure in the above embodiment. It should be noted that the battery includes the battery thermal runaway detection structure, which also includes all the advantages of the battery thermal runaway detection structure mentioned above, which will not be repeated here.
[0052] The embodiment of the present application also provides an energy storage device, including the battery in the above embodiment. Specifically, the energy storage device can be a vehicle, an operating machine, etc. It should be noted that the energy storage device includes a battery, which also includes all the advantages of the battery mentioned above, which will not be repeated here.
[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0055] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0056] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean 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 present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics 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.
[0057] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.
Claims
1. A battery thermal runaway detection structure, characterized in that: include: A first circuit has a first end and a second end, wherein the first end is disposed at an end surface of the battery module, and the first end can be electrically connected to an input end of a battery management system; A second circuit has a third end and a fourth end, the fourth end is arranged at the other end surface of the battery module, the fourth end is arranged opposite to the first end, and the fourth end can be electrically connected to the output end of the battery management system; A variable resistance mechanism is used to connect the second end and the third end. The first circuit, the variable resistance mechanism, the second circuit and the battery management system are electrically connected in sequence to form a detection circuit. The resistance value of the variable resistance mechanism connected to the detection circuit can be changed by changing the distance between the second end and the third end.
2. The battery thermal runaway detection structure according to claim 1, characterized in that: The variable resistance mechanism comprises: a variable resistance part connected to the second end; A connecting part is connected to the third end, and the connecting part is slidably matched with the variable resistance part. The connecting part slides on the surface of the variable resistance part to change the resistance value of the variable resistance part connected to the detection circuit.
3. The battery thermal runaway detection structure according to claim 2, characterized in that: The connection portion forms a limiting groove, the notch of the limiting groove faces the variable resistance portion, the variable resistance portion is arranged in the limiting groove, and the variable resistance portion can move along the groove depth direction of the limiting groove.
4. The battery thermal runaway detection structure according to claim 3, characterized in that: A contact body is protrudingly provided on the inner side wall of the limiting groove, and the contact body is slidably connected to the surface of the variable resistance part.
5. The battery thermal runaway detection structure according to any one of claims 2 to 4, characterized in that: The variable resistance part includes a resistor body and a conductor. The resistor body and the conductor are arranged at intervals along a preset direction, and the preset direction is the length direction of the first circuit.
6. The battery thermal runaway detection structure according to claim 5, characterized in that: The first circuit includes a first insulating core, a first conductive layer and a first insulating layer, and the first insulating core, the first conductive layer and the first insulating layer are arranged in sequence from the center of the first circuit to the outer surface of the first circuit along the radial direction of the first circuit; And / or, the second circuit includes a second insulating core, a second conductive layer and a second insulating layer, and the second insulating core, the second conductive layer and the second insulating layer are arranged in sequence along the radial direction of the second circuit from the center of the second circuit to the outer surface of the second circuit.
7. The battery thermal runaway detection structure according to claim 6, characterized in that: The varistor part has a connection hole, and the connection hole penetrates the varistor part along the length direction of the first line, and the first insulating core is inserted into the connection hole.
8. The battery thermal runaway detection structure according to claim 7, characterized in that: It also includes an insulating sheet, which is arranged at a position of the variable resistance part away from the second end, and the insulating sheet is connected to the first insulating core.
9. A battery, characterized in that: The invention comprises the battery thermal runaway detection structure as described in any one of claims 1 to 8.
10. An energy storage device, characterized in that: A battery comprising the battery of claim 9.