Thermal runaway triggering device and using method thereof

Abstract

The invention discloses a thermal runaway triggering device and a using method thereof, and belongs to the technical field of new energy automobiles. The thermal runaway triggering device comprises a heat conduction shell and a magnetic part, and the heat conduction shell is provided with the magnetic part so that the heat conduction shell can be magnetically attracted to one face of a battery; the heating piece is arranged in the inner cavity of the heat conduction shell; and the temperature measuring piece is arranged in the inner cavity of the heat conduction shell and is used for detecting the temperature of the heating piece. Compared with the scheme that the heating ring is sleeved outside the battery, the thermal runaway triggering device has smaller influence on explosion pressure after thermal runaway of the battery, so that the accuracy of the safety test of the battery is higher.

Description

Technical Field

[0001] The present application belongs to the technical field of new energy vehicles, and specifically relates to a thermal runaway trigger device and a method for using the same. Background Art

[0002] With the popularity of new energy vehicles, the requirements for battery safety performance are becoming increasingly stringent. At present, when conducting battery safety tests, in order to simulate the thermal runaway phenomenon of the battery, it is usually necessary to equip a special thermal runaway trigger device to heat the battery.

[0003] However, the traditional thermal runaway trigger device is generally a heating coil, and the heating coil is directly mounted on the outside of the battery during the heating process. In this heating method, the heating coil will affect the explosion pressure after the battery thermal runaway. Specifically, the heating wire of the heating coil is wrapped around the outside of the battery, which makes the battery shell more resistant to impact, resulting in the measured explosion pressure value being lower than the actual value, which in turn makes the accuracy of the battery safety test lower. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a thermal runaway trigger device and a method of using the same, which can solve the problem of low accuracy of battery safety testing in the related art.

[0005] In a first aspect, an embodiment of the present application provides a thermal runaway triggering device, comprising: A heat-conducting shell and a magnetic member, wherein the heat-conducting shell is provided with the magnetic member so that the heat-conducting shell can be magnetically attracted to one side of the battery; A heating element, the heating element being arranged in the inner cavity of the heat-conducting housing; A temperature measuring element is disposed in the inner cavity of the heat-conducting shell and is used to detect the temperature of the heating element.

[0006] In a second aspect, an embodiment of the present application provides a method for using the thermal runaway trigger device as described above, which comprises the following steps: Magnetically attaching the heat-conducting housing of the thermal runaway trigger device to one side of the battery; When the real-time temperature of the heating element measured by the temperature measuring element is greater than the thermal runaway trigger temperature of the battery, the heating element is turned off.

[0007] In the embodiment of the present application, the heat-conducting shell of the thermal runaway trigger device can be magnetically attracted to one side of the battery, and the heating element and the temperature measuring element are both arranged in the inner cavity of the heat-conducting shell, that is, the thermal runaway trigger device is located on one side of the battery as a whole. Compared with the solution in which the heating ring is arranged outside the battery, the solution in which the thermal runaway trigger device is located on one side of the battery as a whole has less impact on the explosion pressure after the battery thermal runaway, thereby making the accuracy of the battery safety test higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 An explosion schematic diagram of the thermal runaway trigger device disclosed in an embodiment of the present application; Figure 2 Schematic diagram of the cooperation between the thermal runaway trigger device and the battery disclosed in the embodiment of the present application.

[0009] Description of reference numerals: 100 - heat-conducting housing, 110 - upper cover, 120 - lower cover, 121 - first opening, 122 - second opening; 200-magnetic parts; 300-heating element; 400-temperature measuring device; 500-Thermostat; 610 - first insulating plate, 620 - second insulating plate, 630 - third insulating plate; 710-first conductive member, 720-second conductive member; 810-first core wire, 820-second core wire; 900-battery. DETAILED DESCRIPTION

[0010] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0011] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0012] The thermal runaway trigger device and its use method provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0013] Please refer to Figure 1 and Figure 2 As shown, a thermal runaway triggering device is provided in an embodiment of the present application, comprising: a heat-conducting housing 100 , a magnetic component 200 , a heating component 300 and a temperature measuring component 400 .

[0014] Specifically, the heat-conducting housing 100 is made of a heat-conducting material. Optionally, the heat-conducting housing 100 is made of a metal material, more specifically, iron, and includes an upper cover 110 and a lower cover 120, which are arranged opposite to each other in the thickness direction of the heat-conducting housing 100 and connected to each other, and the upper cover 110 and the lower cover 120 together enclose an inner cavity of the heat-conducting housing 100.

[0015] The heat-conductive housing 100 is provided with a magnetic member 200 so that the heat-conductive housing 100 can be magnetically attracted to one side of the battery 900, thereby realizing the connection between the thermal runaway trigger device and the battery 900. Optionally, in the case where the battery 900 has a safety valve, the heat-conductive housing 100 is, for example, magnetically attracted to the side of the battery 900 without the safety valve. More specifically, the safety valve is, for example, provided at the first end face of the battery 900, and the heat-conductive housing 100 is, for example, magnetically attracted to the second end face of the battery 900. The first end face and the second end face are two opposite end faces of the battery 900. Of course, the heat-conductive housing 100 can also be magnetically attracted to the side of the battery 900. In the case where the battery 900 is not provided with a safety valve, the heat-conductive housing 100 can be magnetically attracted to any side of the battery 900. In addition, the battery 900 is, for example, a battery cell or a battery module.

[0016] The heating element 300 is disposed in the inner cavity of the heat-conducting housing 100. When the heating element 300 is working, it releases heat to the outside, and the heat is transferred to the battery 900 through the heat-conducting housing 100, thereby increasing the temperature of the battery 900. The temperature measuring element 400 is disposed in the inner cavity of the heat-conducting housing 100 and is used to detect the temperature of the heating element 300.

[0017] In the embodiment of the present application, the heat-conducting housing 100 of the thermal runaway trigger device can be magnetically attracted to one side of the battery 900, and the heating element 300 and the temperature measuring element 400 are both arranged in the inner cavity of the heat-conducting housing 100, that is, the thermal runaway trigger device is located as a whole on one side of the battery 900. Compared with the solution in which the heating ring is arranged outside the battery 900, the solution in which the thermal runaway trigger device is located as a whole on one side of the battery 900 has less impact on the explosion pressure of the battery 900 after thermal runaway, thereby making the accuracy of the safety test of the battery 900 higher.

[0018] In another embodiment, reference Figure 2 As shown, the thermal runaway triggering device further includes a thermostat 500, and the thermostat 500 is electrically connected to both the temperature measuring element 400 and the heating element 300. Optionally, the heating element 300 is, for example, a thermocouple, and the temperature measuring element 400 is, for example, a resistance wire. In this embodiment, the thermostat 500 can automatically control the opening and closing of the heating element 300, thereby saving manpower.

[0019] During specific use, the temperature measuring element 400 transmits the temperature information of the heating element 300 detected by it to the thermostat 500, and the thermostat 500 controls the opening and closing of the heating element 300 according to the temperature information. Specifically, when the temperature of the heating element 300 is greater than the trigger temperature of the thermal runaway of the battery 900, the thermostat 500 controls the heating element 300 to be turned off to reduce the interference of the heating element 300 on the thermal runaway phenomenon. In addition, during specific use, the thermostat 500 can monitor the temperature of the heating element 300 in real time, and the thermostat 500 controls the heating temperature of the heating element 300, for example, by controlling the current input to the heating element 300.

[0020] In other optional embodiments, the thermal runaway trigger device may not include the thermostat 500. In this case, a switch is connected in series between the heating element 300 and the external power supply. During specific use, the operator manually controls the opening and closing of the heating element 300 with the help of the switch.

[0021] In another embodiment, reference Figure 1 As shown, the thermal runaway triggering device further includes a first insulating plate 610, which is disposed in the inner cavity of the heat-conducting housing 100, and a heating element 300 is disposed on a side of the first insulating plate 610 that is away from the temperature measuring element 400. The presence of the first insulating plate 610 provides an installation basis for the installation of the heating element 300, thereby making the installation of the heating element 300 more convenient and making the stability of the heating element 300 better. In addition, the first insulating plate 610 can electrically isolate the heating element 300 from the temperature measuring element 400, thereby preventing the two from interfering with each other.

[0022] In other optional embodiments, the thermal runaway triggering device may also not include the first insulating plate 610. At this time, the heating element 300 is, for example, spaced apart from the temperature measuring element 400 in the thickness direction of the heat-conducting housing 100.

[0023] In an optional embodiment, when the heating element 300 is a resistance wire, the heating element 300 is, for example, arranged in a circuitous manner on a side of the first insulating plate 610 away from the temperature measuring element 400. In this arrangement, the heating element 300 is laid flat on a side of the first insulating plate 610 away from the temperature measuring element 400, so that the thermal runaway trigger device is more compact and smaller in size.

[0024] In a further embodiment, reference Figure 1As shown, the thermal runaway trigger device further includes a first conductive member 710 and a second conductive member 720, the positive terminal of the heating member 300 is electrically connected to the positive terminal of the temperature measuring member 400 through the first conductive member 710, the negative terminal of the heating member 300 is electrically connected to the negative terminal of the temperature measuring member 400 through the second conductive member 720, and both the first conductive member 710 and the second conductive member 720 pass through the first insulating plate 610. In this arrangement, the first insulating plate 610 can limit the movement of the first conductive member 710 and the second conductive member 720, so that the stability of the first conductive member 710 and the second conductive member 720 is good.

[0025] It should be noted that the positive terminal of the heating element 300 refers to the end of the heating element 300 used to be connected to the positive pole of the power supply, the negative terminal of the heating element 300 refers to the end of the heating element 300 used to be connected to the negative pole of the power supply, the positive terminal of the temperature measuring element 400 refers to the end of the temperature measuring element 400 used to be connected to the positive pole of the power supply, and the negative terminal of the temperature measuring element 400 refers to the end of the temperature measuring element 400 used to be connected to the negative pole of the power supply.

[0026] In other optional embodiments, the first conductive member 710 and the second conductive member 720 may also be disposed outside the first insulating plate 610 .

[0027] As a specific implementation, the first conductive member 710 and the second conductive member 720 are both sheet-shaped structures, and the first conductive member 710 and the second conductive member 720 are both metal members, more specifically, iron members.

[0028] In a further embodiment, reference Figure 1 As shown, a portion of the first conductive member 710 is located on a side of the heating member 300 away from the first insulating plate 610, so that the heating member 300 is sandwiched between a portion of the first conductive member 710 and the first insulating plate 610, and a portion of the second conductive member 720 is located on a side of the heating member 300 away from the first insulating plate 610, so that the heating member 300 is sandwiched between a portion of the second conductive member 720 and the first insulating plate 610. In this way, the first conductive member 710 and the second conductive member 720 can both limit the movement of the heating member 300, so that the stability of the heating member 300 is better.

[0029] Optionally, a portion of the first conductive member 710 located on a side of the heating member 300 away from the first insulating plate 610 and a portion of the second conductive member 720 located on a side of the heating member 300 away from the first insulating plate 610 are, for example, both directly in contact with the heating member 300, thereby achieving electrical connection between the first conductive member 710 and the second conductive member 720 and the heating member 300.

[0030] In other optional embodiments, a portion of the first conductive member 710 may also be located on the side of the heating member 300 facing the first insulating plate 610, and electrically connected to the positive end of the heating member 300, and a portion of the second conductive member 720 may be located on the side of the heating member 300 facing the first insulating plate 610, and electrically connected to the negative end of the heating member 300.

[0031] In another embodiment, reference Figure 1 As shown, the magnetic member 200 is configured as a magnetic plate, and the magnetic member 200 is arranged in the inner cavity of the heat-conducting housing 100 and is located on the side of the heating member 300 away from the temperature measuring member 400, and the magnetic member 200 is an insulating member. In this way, the magnetic member 200 is hidden inside the heat-conducting housing 100, so that the service life of the magnetic member 200 is longer. In addition, by configuring the magnetic member 200 as an insulating member, the magnetic member 200 can electrically isolate the part of the heat-conducting housing 100 facing the heating member 300 from the heating member 300, so that the use of the thermal runaway trigger device is safer.

[0032] During specific use, the heat released by the heating element 300 is transferred to the heat-conducting housing 100 through the magnetic element 200, and then transferred to the battery 900 through the heat-conducting housing 100, and the magnetic element 200 can, for example, adsorb the heat-conducting housing 100 and the battery 900 at the same time.

[0033] It should be noted that the outer shell of the battery 900 is made of metal material. Under the magnetic force of the magnetic member 200 , the outer shell of the battery 900 and the thermally conductive shell 100 are attached together, so that the thermally conductive shell 100 can be magnetically attracted to one side of the battery 900 .

[0034] Optionally, in order to extend the service life of the magnetic member 200, the magnetic member 200 is, for example, a high temperature resistant magnetic member, and the two opposite sides of the magnetic member 200 in the thickness direction of the heat-conducting housing 100 are, for example, respectively in contact with the heating member 300 and the inner wall of the heat-conducting housing 100. In addition, in order to make the magnetic member 200 have a stronger suction force, the magnetic member 200 is, for example, a strong magnetic member.

[0035] In other optional embodiments, the magnetic member 200 may also be disposed outside the heat-conducting housing 100, in which case the magnetic member 200 is, for example, fixedly connected to the heat-conducting housing 100 to prevent the magnetic member 200 from being separated from the heat-conducting housing 100. Of course, the magnetic member 200 may also be embedded in a portion of the heat-conducting housing 100, for example, embedded in the upper cover 110 described above.

[0036] In another embodiment, reference Figure 1 and Figure 2As shown, the thermal runaway trigger device further includes a first core wire 810 and a second core wire 820, the positive terminal of the heating element 300 and the positive terminal of the temperature measuring element 400 are both electrically connected to the first end of the first core wire 810, the negative terminal of the heating element 300 and the negative terminal of the temperature measuring element 400 are both electrically connected to the first end of the second core wire 820, the heat-conducting housing 100 is provided with a first opening 121 and a second opening 122, the second end of the first core wire 810 is the lead-out end of the first core wire 810, and the second end of the first core wire 810 passes through the first opening 121, the second end of the second core wire 820 is the lead-out end of the second core wire 820, and the second end of the second core wire 820 passes through the second opening 122. There is a gap between the edge of the first opening 121 and the first core wire 810, and between the edge of the second opening 122 and the second core wire 820.

[0037] In this embodiment, since there are gaps between the edge of the first opening 121 and the first core wire 810 and between the edge of the second opening 122 and the second core wire 820, the probability of the first core wire 810 and the second core wire 820 contacting the heat-conducting housing 100 is low, thereby making the use of the thermal runaway trigger device safer.

[0038] In addition, compared to the solution in which the positive end of the heating element 300, the negative end of the heating element 300, the positive end of the temperature measuring element 400 and the negative end of the temperature measuring element 400 are each connected to a core wire, the solution adopted in this embodiment only involves the first core wire 810 and the second core wire 820, so that the solution adopted in this embodiment involves fewer core wires, and thus the solution adopted in this embodiment is simpler.

[0039] Optionally, the second end of the first core wire 810 can be electrically connected to the positive terminal of the temperature controller 500, and the second end of the second core wire 820 can be electrically connected to the negative terminal of the temperature controller 500. In this case, the temperature information of the heating element 300 measured by the temperature measuring element 400 can be transmitted to the temperature controller 500 through the first core wire 810 and the second core wire 820. At the same time, the temperature controller 500 can also supply power to the heating element 300 and the temperature measuring element 400 at the same time through the first core wire 810 and the second core wire 820.

[0040] As a specific implementation, the first end of the first core wire 810 is, for example, connected to the connection position between the first conductive member 710 and the temperature measuring member 400 , and the first end of the second core wire 820 is, for example, connected to the connection position between the second conductive member 720 and the temperature measuring member 400 .

[0041] In another embodiment, the outer surface of the first core wire 810 is wrapped with a first insulating sleeve, for example, and the outer surface of the second core wire 820 is wrapped with a second insulating sleeve. In this way, the first insulating sleeve can electrically isolate the first core wire 810 from the heat-conducting housing 100, and the second insulating sleeve can electrically isolate the second core wire 820 from the conductive housing, thereby improving the safety of the thermal runaway trigger device.

[0042] Furthermore, the edge of the first opening 121, for example, fits with the first insulating sleeve, and the edge of the second opening 122, for example, fits with the second insulating sleeve to prevent the first core wire 810 and the second core wire 820 from shaking. Of course, there may also be a gap between the edge of the first opening 121 and the first insulating sleeve, and between the edge of the second opening 122 and the second insulating sleeve.

[0043] In a further embodiment, reference Figure 1 As shown, the thermal runaway trigger device also includes a second insulating plate 620, which is disposed in the inner cavity of the heat-conducting housing 100, and a temperature measuring element 400 is disposed on one side of the second insulating plate 620 facing the heating element 300, and the first core wire 810 and the second core wire 820 both pass through the second insulating plate 620. The existence of the second insulating plate 620 provides an installation basis for the installation of the temperature measuring element 400, thereby making the installation of the temperature measuring element 400 more convenient and making the stability of the temperature measuring element 400 better. In addition, the first core wire 810 and the second core wire 820 both pass through the second insulating plate 620, so that the second insulating plate 620 can limit the movement of the first core wire 810 and the second core wire 820, thereby making the stability of the first core wire 810 and the second core wire 820 better.

[0044] In other optional embodiments, the thermal runaway trigger device may not include the second insulating plate 620, or the thermal runaway trigger device includes the second insulating plate 620, but the first core wire 810 and the second core wire 820 are both located outside the second insulating plate 620. In other words, the second insulating plate 620 does not restrict the movement of the first core wire 810 and the second core wire 820.

[0045] In a further embodiment, the temperature measuring element 400 is bonded to the second insulating plate 620. The bonding method does not damage the structure of the temperature measuring element 400 and the second insulating plate 620, so that the service life of the temperature measuring element 400 and the second insulating plate 620 is long.

[0046] Optionally, the temperature measuring element 400 is bonded to the second insulating plate 620 by, for example, high temperature resistant solid glue.

[0047] In other optional embodiments, the thermal runaway trigger device may also include bolts and nuts, one end of the bolt, for example, passes through the temperature measuring component 400 and the second insulating plate 620 in sequence, and is locked by the nut to achieve connection between the temperature measuring component 400 and the second insulating plate 620.

[0048] In a further embodiment, reference Figure 1 As shown, the thermal runaway triggering device further includes a third insulating plate 630, which is disposed in the inner cavity of the heat-conducting housing 100 and is located on the side of the temperature measuring element 400 away from the heating element 300, and the third insulating plate 630 and the temperature measuring element 400 are spaced apart in the thickness direction of the heat-conducting housing 100, and the first core wire 810 and the second core wire 820 both pass through the third insulating plate 630. Due to the presence of the third insulating plate 630, the first core wire 810 and the second core wire 820 are further fixed, so that the stability of the first core wire 810 and the second core wire 820 is better.

[0049] In other optional embodiments, the thermal runaway trigger device may also not include the third insulating plate 630. In addition, when the outer surface of the first core wire 810 is wrapped with the first insulating sleeve and the outer surface of the second core wire 820 is wrapped with the second insulating sleeve, the third insulating plate 630 and the second insulating plate 620 mentioned above may both be conductive plates.

[0050] In a further embodiment, the magnetic member 200 is, for example, the magnetic plate mentioned above, and the thickness directions of the magnetic member 200, the first insulating plate 610, the second insulating plate 620, and the third insulating plate 630 are, for example, coincident with the thickness direction of the heat-conducting housing 100, so that the size of the thermal runaway trigger device in the thickness direction of the heat-conducting housing 100 is small. The thickness direction of the heat-conducting housing 100 is, for example, Figure 2 In the direction indicated by the arrow line A, the heating element 300 is for example fitted with the magnetic element 200, and the third insulating plate 630 is for example fitted with the second insulating plate 620, so that the thermal runaway trigger device is more compact and smaller in size.

[0051] It should be noted that in the embodiment of the present application, there is no restriction on the shapes of the magnetic member 200, the first insulating plate 610, the second insulating plate 620, the third insulating plate 630, the heating member 300, the temperature measuring member 400 and the heat-conducting shell 100, which are determined according to actual needs, and the thermal runaway trigger device can be magnetically connected to at least two batteries 900 at the same time. In other words, the thermal runaway trigger device can heat at least two batteries 900 at the same time. Of course, the thermal runaway trigger device can also heat only one battery 900.

[0052] In another embodiment, the temperature measuring element 400 is a sheet structure, and the thickness direction of the temperature measuring element 400 coincides with the thickness direction of the heat-conducting housing 100. In this way, the size of the temperature measuring element 400 in the thickness direction of the heat-conducting housing 100 is small, so that the volume of the thermal runaway trigger device is small.

[0053] Furthermore, the temperature measuring element 400 is, for example, fitted with the first insulating plate 610 to further reduce the size of the thermal runaway triggering device in the thickness direction of the heat-conducting housing 100 .

[0054] In other optional embodiments, the temperature measuring element 400 may also be a block structure or a strip structure, for example.

[0055] The present application also provides a method for using the thermal runaway trigger device described above, which comprises the following steps: The heat-conducting housing 100 of the thermal runaway trigger device is magnetically attached to one side of the battery 900; When the real-time temperature of the heating element 300 measured by the temperature measuring element 400 is greater than the thermal runaway triggering temperature of the battery 900 , the heating element 300 is turned off.

[0056] Optional, reference Figure 2 As shown, the battery 900 is supported on a thermal runaway trigger device, for example. When performing safety tests on the battery 900, the battery 900 must be supported on a certain structure. In this way, by supporting the battery 900 on the thermal runaway trigger device, the interference of the thermal runaway trigger device on the thermal runaway phenomenon of the battery 900 can be reduced, thereby improving the accuracy of the safety test of the battery 900. More specifically, refer to Figure 2 As shown, the bottom end surface of the battery 900 is, for example, supported on a thermal runaway trigger device, and in this case, the top end surface of the battery 900 is, for example, provided with a safety valve. This arrangement is consistent with the scenario when the battery 900 is actually used, thereby being able to more realistically simulate the thermal runaway phenomenon of the battery 900.

[0057] Optionally, the temperature measuring component 400 and the heating component 300 are both electrically connected to the thermostat 500 mentioned above, and when the real-time temperature of the heating component 300 measured by the temperature measuring component 400 is greater than the thermal runaway trigger temperature of the battery 900, the thermostat 500 automatically controls the heating component 300 to turn off.

[0058] In specific use, when the temperature of the heating element 300 reaches the thermal runaway trigger temperature of the battery 900, the temperature of the heating element 300 is kept constant. In this case, when the battery 900 has thermal runaway, the temperature of the battery 900 will be higher than the temperature of the heating element 300, so that the temperature of the battery 900 will be reversely transmitted to the heating element 300, so that the temperature of the heating element 300 is higher than the thermal runaway trigger temperature of the battery 900. Therefore, by judging whether the temperature of the heating element 300 is higher than the thermal runaway trigger temperature of the battery 900, it can be judged whether the battery 900 has thermal runaway.

[0059] The thermal runaway trigger device provided in the embodiments of the present application is described in detail below in conjunction with two specific embodiments: Embodiment 1: Take 18650-4.2V cylindrical single lithium-ion battery as an example, fully charge the battery 900 and refer to Figure 2 As shown, the bottom end surface of the battery 900, that is, the side of the battery 900 without a safety valve, is supported on the thermal runaway trigger device, and a pressure sensor is installed. The distance between the pressure sensor and the battery 900 is 20 cm. Then, the thermostat 500 is turned on to increase the temperature of the heating element 300 to the thermal runaway trigger temperature of the battery 900. In the event of thermal runaway of the battery 900, the explosion pressure of the battery 900 after the thermal runaway is recorded.

[0060] For comparison, the heating coil is set on the outside of the battery 900 and is wrapped around the peripheral side wall of the battery 900. The thermal runaway test is performed using the same heating steps, and the explosion pressure of the battery 900 after thermal runaway is recorded. The explosion pressure values ​​corresponding to the thermal runaway trigger device and the heating coil are shown in Table 1 below.

[0061] Table 1 Explosion pressure values ​​corresponding to thermal runaway trigger device and heating coil

[0062] It can be seen from Table 1 above that, compared with the heating coil, the thermal runaway trigger device provided in the embodiment of the present application has less impact on the explosion pressure.

[0063] Embodiment 2: Taking a 18650-4.2V cylindrical single lithium-ion battery with a positive electrode of lithium iron phosphate as an example, six batteries 900 are set, and the six batteries 900 are charged to different capacities, and each 20% is set as a working condition, and the six batteries 900 are arranged on six thermal runaway triggering devices according to the arrangement of the batteries 900 in Example 1. When each battery 900 has thermal runaway, the thermal runaway triggering time of each battery 900 is recorded. The thermal runaway triggering time of batteries 900 under different working conditions is shown in Table 2 below.

[0064] Table 2 Thermal runaway triggering time of battery 900 under different working conditions

[0065] It can be seen from Table 2 above that when the battery 900 is heated in the same manner but has a different state of charge, the thermal runaway trigger time is different. In the embodiment of the present application, by connecting the heating element 300 to the thermostat 500, the thermostat 500 can monitor the thermal runaway trigger time of the battery 900 in real time.

[0066] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A thermal runaway trigger device, characterized in that: include: A heat-conducting housing (100) and a magnetic member (200), wherein the heat-conducting housing (100) is provided with the magnetic member (200) so that the heat-conducting housing (100) can be magnetically attracted to one side of a battery (900); A heating element (300), the heating element (300) being arranged in the inner cavity of the heat-conducting housing (100); A temperature measuring element (400), the temperature measuring element (400) being arranged in the inner cavity of the heat-conducting housing (100) and being used to detect the temperature of the heating element (300).

2. The thermal runaway triggering device according to claim 1, characterized in that: The thermal runaway triggering device further comprises a temperature controller (500), wherein the temperature controller (500) is electrically connected to both the temperature measuring element (400) and the heating element (300).

3. The thermal runaway triggering device according to claim 1, characterized in that: The thermal runaway triggering device further comprises a first insulating plate (610), wherein the first insulating plate (610) is arranged in the inner cavity of the heat-conducting housing (100), and the heating element (300) is arranged on a side of the first insulating plate (610) facing away from the temperature measuring element (400).

4. The thermal runaway triggering device according to claim 3, characterized in that: The thermal runaway triggering device further comprises a first conductive member (710) and a second conductive member (720); the positive terminal of the heating member (300) is electrically connected to the positive terminal of the temperature measuring member (400) via the first conductive member (710); the negative terminal of the heating member (300) is electrically connected to the negative terminal of the temperature measuring member (400) via the second conductive member (720); and both the first conductive member (710) and the second conductive member (720) pass through the first insulating plate (610).

5. The thermal runaway triggering device according to claim 4, characterized in that: A portion of the first conductive member (710) is located on a side of the heating member (300) that is away from the first insulating plate (610), so that the heating member (300) is clamped between a portion of the first conductive member (710) and the first insulating plate (610), and a portion of the second conductive member (720) is located on a side of the heating member (300) that is away from the first insulating plate (610), so that the heating member (300) is clamped between a portion of the second conductive member (720) and the first insulating plate (610).

6. The thermal runaway triggering device according to claim 1, characterized in that: The magnetic component (200) is configured as a magnetic plate, the magnetic component (200) is arranged in the inner cavity of the heat-conducting housing (100) and is located on a side of the heating component (300) away from the temperature measuring component (400), and the magnetic component (200) is an insulating component.

7. The thermal runaway triggering device according to claim 1, characterized in that: The thermal runaway triggering device further comprises a first core wire (810) and a second core wire (820); the positive terminal of the heating element (300) and the positive terminal of the temperature measuring element (400) are both electrically connected to the first end of the first core wire (810); the negative terminal of the heating element (300) and the negative terminal of the temperature measuring element (400) are both electrically connected to the first end of the second core wire (820); the heat-conducting housing (100) is provided with a first opening and a second opening; the second end of the first core wire (810) is the lead-out end of the first core wire (810), and the second end of the first core wire (810) passes through the first opening; the second end of the second core wire (820) is the lead-out end of the second core wire (820), and the second end of the second core wire (820) passes through the second opening; There is a gap between the edge of the first opening and the first core wire (810), and between the edge of the second opening and the second core wire (820); or, the outer surface of the first core wire (810) is wrapped with a first insulating sleeve, and the outer surface of the second core wire (820) is wrapped with a second insulating sleeve.

8. The thermal runaway triggering device according to claim 7, characterized in that: The thermal runaway triggering device further comprises a second insulating plate (620), the second insulating plate (620) being arranged in the inner cavity of the heat-conducting housing (100), and the temperature measuring element (400) being arranged on a side of the second insulating plate (620) facing the heating element (300), and the first core wire (810) and the second core wire (820) both passing through the second insulating plate (620); And / or, the thermal runaway triggering device further comprises a third insulating plate (630), the third insulating plate (630) being arranged in the inner cavity of the heat-conducting housing (100) and being located on a side of the temperature measuring element (400) facing away from the heating element (300), and the third insulating plate (630) and the temperature measuring element (400) being spaced apart in a thickness direction of the heat-conducting housing (100), and the first core wire (810) and the second core wire (820) both passing through the third insulating plate (630).

9. The thermal runaway triggering device according to claim 8, characterized in that: The temperature measuring element (400) is a sheet-like structure, and the thickness direction of the temperature measuring element (400) coincides with the thickness direction of the heat-conducting housing (100); And / or, the temperature measuring component (400) is bonded to the second insulating plate (620).

10. A method for using the thermal runaway trigger device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Magnetically attaching the heat-conducting housing (100) of the thermal runaway triggering device to one side of the battery (900); When the real-time temperature of the heating element (300) measured by the temperature measuring element (400) is greater than the thermal runaway trigger temperature of the battery (900), the heating element (300) is turned off.

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