Electrode core, battery, and thermal runaway triggering device and method

Abstract

An electrode core, a battery, and a thermal runaway triggering device and method, relating to the technical field of batteries. The electrode core comprises an electrode core body (1) and at least two test electrodes (10); a plurality of electrode sheets (20) being separated from one another are provided inside the electrode core body (1), the test electrodes (10) have first ends (101) and second ends (102), the first ends (101) are provided on a target electrode sheet (201) among the plurality of electrode sheets (20) and are electrically insulated from the target electrode sheet (201), and the second ends (102) are located outside the electrode core body (1). When thermal runaway of the electrode core is triggered, a thermal runaway voltage is provided to the second ends (102), and the thermal runaway voltage is applied to the target electrode sheet (201) to trigger thermal runaway of the electrode core. Since the structure and inherent functions of the electrode core are not changed, when the test electrodes (10) are used to trigger thermal runaway of the electrode core, the thermal runaway is closer to the thermal runaway caused by a real internal short circuit of the electrode core.

Description

Pole core, battery, thermal runaway triggering device and method

[0001] Cross-reference to related applications

[0002] The present application claims priority to the Chinese patent application No. 202411314698.4, filed on September 19, 2024, and entitled "Pole core, battery, thermal runaway triggering device and method", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a pole core, a battery, a thermal runaway triggering device and a method. BACKGROUND

[0004] At present, with the development of new energy vehicles, the safety of new energy vehicle batteries has attracted more and more attention from the public. Safety evaluation and protection scheme of the battery are two important technologies to improve the safety of the battery. The key point of these two technologies is to find a stable and controllable triggering method close to the real internal short thermal runaway to evaluate the safety of the battery. SUMMARY

[0005] The present application provides a pole core, a battery, a thermal runaway triggering device and a method to provide a stable and controllable triggering method close to the real internal short thermal runaway to evaluate the safety performance of the pole core.

[0006] The present application provides a pole core for thermal runaway triggering test of a battery, comprising a pole core body, at least two test electrodes, and a plurality of pole pieces arranged at intervals in the pole core body.

[0007] The test electrode has a first end and a second end. The first end is arranged on a target pole piece of the plurality of pole pieces and is electrically insulated from the target pole piece. The second end is located outside the pole core body and is used to receive a thermal triggering voltage.

[0008] The present application also provides a battery, comprising at least one set of test pole columns, a packaging shell, and at least one pole core of the present application.

[0009] The pole core is arranged inside the packaging shell. The at least one set of test pole columns extends from the inside of the packaging shell to the outside of the packaging shell and is electrically insulated from the packaging shell.

[0010] The part of at least one target test pole column in the at least one set of test pole columns located inside the packaging shell is connected with the second end of at least one test electrode in the at least one pole core.

[0011] The at least one set of test pole columns is used to receive an external thermal triggering voltage.

[0012] The application further provides a thermal runaway triggering device, comprising a test power supply, a switch module, a control module and the battery of the application; the positive and negative poles of the test power supply are connected with the first target test pole and the second target test pole in the battery respectively to form a test loop, the switch module is arranged in the test loop, and the control module is in communication connection with the test power supply and the switch module.

[0013] The control module is used for determining the thermal runaway voltage according to the type of the battery, controlling the switch module to be closed, and controlling the test power supply to provide the thermal runaway voltage to the two target test poles to trigger the thermal runaway of the battery.

[0014] The application further provides a battery thermal runaway triggering method, which comprises the following steps:

[0015] The battery is provided, comprising a first target test pole and a second target test pole.

[0016] One end of the test power supply is connected to the first target test pole, and the other end of the test power supply is connected to the second target test pole to form a test loop.

[0017] The test loop is closed to provide the battery with electric energy by the test power supply to trigger the thermal runaway of the battery.

[0018] The technical scheme provided by the application comprises a pole core body and at least two test electrodes. The test electrode has a first end located inside the pole core body and a second end located outside the pole core body. The first end is arranged on a target pole piece of the pole core body and is electrically insulated from the target pole piece, so as to ensure that the test electrode does not interfere with the inherent function and normal use of the pole core. The second end is used for receiving an external thermal triggering voltage. In the case of triggering thermal runaway by using the pole core, a thermal runaway voltage is provided to the second end. The thermal runaway voltage is applied to the target pole piece through the test electrode to trigger the thermal runaway of the pole core. Since the structure and inherent function of the pole core are not changed, the use of the test electrode to trigger the thermal runaway of the pole core is closer to the real internal short thermal runaway mode. In addition, the thermal runaway voltage provided to the second end can be stably controlled according to the external voltage source when the pole core is used to simulate the thermal runaway of the pole core. Therefore, the pole core can provide a stable and controllable mode close to the real internal short thermal runaway to evaluate the safety performance of the battery comprising the pole core. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments consistent with the application and, together with the description, serve to explain the principles of the application.

[0020] FIG. 1 is a structural schematic view of a pole core provided by an embodiment of the application;

[0021] Fig. 2 is a structural schematic diagram of an electrode core provided by an embodiment of the present application, which includes two test electrodes, and the first ends of the test electrodes are arranged on the same target and tab;

[0022] Fig. 3 is a structural schematic diagram of another electrode core provided by an embodiment of the present application, which includes two test electrodes, and the first ends of the test electrodes are arranged on the same target and tab;

[0023] Fig. 4 is a structural schematic diagram of still another electrode core provided by an embodiment of the present application, which includes two test electrodes, and the first ends of the test electrodes are arranged on the same target and tab;

[0024] Fig. 5 is a structural schematic diagram of an electrode core provided by an embodiment of the present application, which includes two test electrodes, and the first ends of the test electrodes are arranged on two targets and tabs;

[0025] Fig. 6 is a structural schematic diagram of another electrode core provided by an embodiment of the present application, which includes two test electrodes, and the first ends of the test electrodes are arranged on two targets and tabs;

[0026] Fig. 7 is a structural schematic diagram of still another electrode core provided by an embodiment of the present application, which includes two test electrodes, and the first ends of the test electrodes are arranged on two targets and tabs;

[0027] Fig. 8 is a structural schematic diagram of an electrode core provided by an embodiment of the present application, in which the first end of the test electrode is provided with a first electrical insulation layer;

[0028] Fig. 9 is a structural schematic diagram of still another electrode core provided by an embodiment of the present application, which includes two test electrodes, and the first ends of the test electrodes are arranged on two targets and tabs;

[0029] Fig. 10 is a structural schematic diagram of a battery provided by an embodiment of the present application;

[0030] Fig. 11 is a structural schematic diagram of another battery provided by an embodiment of the present application;

[0031] Fig. 12 is a structural schematic diagram of a battery thermal runaway triggering device provided by an embodiment of the present application;

[0032] Fig. 13 is a structural schematic diagram of another battery thermal runaway triggering device provided by an embodiment of the present application;

[0033] Fig. 14 is a flowchart of a battery thermal runaway triggering method provided by an embodiment of the present application.

[0034] Reference numerals: 1 - pole core body, 10 - test electrode, 11 - first test electrode, 12 - second test electrode, 101 - first end of test electrode, 102 - second end of test electrode, 103 - first electrically insulating layer, 111 - first end of first test electrode, 121 - first end of second test electrode, 2 - set of test poles, 20 - plurality of pole pieces, 21 - first target test pole, 22 - second target test pole, 201 - target pole piece, 202 - first pole piece, 203 - second pole piece, 204 - second electrically insulating layer, 3 - packaging case, 4 - battery, 41 - positive pole of battery, 42 - negative pole of battery.

[0035] The specific embodiments of the present application have been shown and described in the above-described drawings, and will be described in more detail hereinafter. These drawings and detailed description are not intended to limit the scope of the present application in any manner, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0036] Exemplary embodiments will be described in detail with reference to the drawings, of which examples are shown. In the following description, the same numbers are used to designate the same elements throughout the drawings. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. It is to be understood that the use of the singular herein includes the plural unless specifically stated otherwise. The use of "first", "second", or "third" to describe various information or data is for the purpose of distinguishing one from another unless specifically stated otherwise. For example, a first action information can be referred to as a second action information, and similarly, a second action information can be referred to as a first action information without departing from the scope of the present application. Both the first action information and the second action information are action information, but they are not the same action information.

[0038] First, the terms related to the present application are explained:

[0039] Real internal short: refers to the direct contact between the positive and negative electrodes inside the battery, forming a low impedance path, resulting in abnormal increase of current inside the battery.

[0040] thermal runaway: refers to a situation in which, during certain chemical reactions or physical processes (such as battery charging and discharging), the temperature rises, causing the reaction rate to accelerate, which in turn generates more heat, which further accelerates the reaction rate, forming a vicious cycle that leads to uncontrollable temperature rise.

[0041] polar core: refers to the basic unit of a battery, which is the smallest chargeable or non-chargeable unit in a battery system. The polar core converts chemical energy into electrical energy or stores electrical energy through chemical reactions. The polar core can be used alone or combined into a battery pack through series or parallel connection to meet different voltage and capacity requirements.

[0042] polar sheet: refers to the carrier of the positive and negative materials in the battery, which is an important component of the battery. The polar sheet is usually composed of active material, conductive agent, binder and current collector, and is made through coating, drying, compaction and other processes.

[0043] At present, with the development of new energy vehicles, the safety of new energy vehicle batteries has attracted more and more attention from the public. Battery safety evaluation and protection scheme are two important technologies to improve battery safety. The key point of these two technologies is to find a stable and controllable method to trigger the real internal short thermal runaway to evaluate the safety of the battery. Based on this, the embodiments of the present application provide a technical scheme for evaluating the safety performance of the polar core by a stable and controllable method close to the real internal short thermal runaway.

[0044] The technical scheme of the present application and how the technical scheme of the present application solves the above technical problems will be described in detail in the specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0045] In a first aspect, referring to FIG. 1, the embodiments of the present application provide a polar core, which includes a polar core body 1, and at least two test electrodes 10; the polar core body 1 has a plurality of polar sheets 20 arranged at intervals inside. The polar sheet 20 is used to store or release electrical energy during the charging and discharging process of the polar core 1. The plurality of polar sheets 20 can be arranged in a stacked manner, and can also be arranged by a winding process, which is not specially limited in the embodiments of the present application.

[0046] The polar core also includes a separator (not shown in the figure) located between adjacent polar sheets, which is used to electrically insulate adjacent polar sheets 20, but the separator also needs to ensure the permeability of ions when the polar core is working normally.

[0047] The structure and material of the above-mentioned electrode and separator can adopt any existing implementation manner, and the embodiments of the present application do not specially limit this.

[0048] When the pole core is used in a specific battery product, the pole core is packaged into a packaging shell, a packaging liquid is also injected into the packaging shell, and the packaging liquid and the pole core are sealed into the packaging shell by a sealing manner using a packaging cover plate to form a battery product.

[0049] Referring to FIG. 1, the test electrode 10 extends from the inside of the pole core body 1 to the outside of the pole core body 1. Among them, the test electrode 10 has a first end 101 located inside the pole core body, and a second end 102 located outside the pole core body, the first end 101 of the test electrode 10 is arranged on the target pole piece 201 and is electrically insulated from the target pole piece 201, so as to ensure that the test electrode 10 does not interfere with the inherent function and normal use of the pole core 1. The second end 102 is used to receive an external thermal trigger voltage.

[0050] In the case of triggering thermal runaway by using the pole core, a thermal runaway voltage is provided to the second end 102, which is applied to the target pole piece 201 through the test electrode 10, and the triggered pole core 1 occurs thermal runaway. Since the structure of the pole core 1 itself has not been changed, when the test electrode 10 is used to trigger thermal runaway, it is closer to the real internal short thermal runaway mode of the pole core 1, and when the pole core 1 is used for pole core thermal runaway simulation, the thermal runaway voltage provided to the second end 102 can be stably controlled according to the external voltage source. Therefore, by using the pole core 1, the present embodiment can provide a stable and controllable way close to the real internal short thermal runaway to evaluate the safety performance of the battery including the above-mentioned pole core.

[0051] Optionally, the above-mentioned pole core can include two test electrodes, or more than two test electrodes. In the thermal trigger test using the pole core, the second ends of the two test electrodes are respectively connected to the positive and negative poles of an external test power source to receive an external thermal trigger voltage. Or, in the thermal trigger test using the pole core, the second ends of any two test electrodes of the more than two test electrodes are respectively connected to the positive and negative poles of an external test power source to receive an external thermal trigger voltage.

[0052] The above introduces the second end of the test electrode, and the following will describe the setting mode of the first end of the test electrode on the pole piece.

[0053] It is worth noting that the following is to describe the setting mode of the first end of the test electrode in different examples in the case that the pole core includes two test electrodes.

[0054] In an optional example, referring to FIGS. 2-4, the two test electrodes can be a first test electrode 11 and a second test electrode 12. The first end 111 of the first test electrode 11 and the first end 121 of the second test electrode 12 are both arranged on the target pole piece 201.

[0055] The first end 111 of the first test electrode 11 and the first end 121 of the second test electrode 12 are both arranged on the target tab 201, and a heat trigger voltage is provided to the core based on the second end of the first test electrode 11 and the second end of the second test electrode 12 to trigger thermal runaway, which can be used to evaluate the stability and safety of the core under extreme conditions, and the arrangement is simple and easy to implement, which can provide support for quality control and safety evaluation during the core manufacturing process.

[0056] Referring to FIGS. 2-4, in the present embodiment, the distance between the first end 111 of the first test electrode 11 and the first end 121 of the second test electrode 12 should meet the thermal runaway requirement, so that the core can undergo thermal runaway when a heat trigger voltage is applied to the first test electrode 11 and the second test electrode 12.

[0057] Optionally, the distance between the first end 111 of the first test electrode 11 and the first end 121 of the second test electrode 12 is within the thermal runaway distance range.

[0058] It should be understood that the thermal runaway distance should not be set too wide to avoid a long thermal runaway trigger time, causing waste of electrical energy. The thermal runaway distance should also not be set too short to avoid a short thermal runaway trigger time, causing uncontrollable situations. Based on this, the thermal runaway distance set in the present embodiment can avoid both a long thermal runaway trigger time causing waste of electrical energy and a short thermal runaway trigger time causing uncontrollable situations.

[0059] Based on the above principles, the thermal runaway distance range in the present embodiment can be, for example, 1-3 mm. Within the thermal runaway distance range, the triggering of thermal runaway of the core can be ensured, and the time of thermal runaway can also be controlled within a reasonable range.

[0060] For example, the thermal runaway distance is 1 mm.

[0061] For example, the thermal runaway distance is 2 mm.

[0062] For example, the thermal runaway distance is 3 mm.

[0063] In another optional example, referring to FIGS. 5-7, the two test electrodes include a first test electrode 11 and a second test electrode 12; the target tab includes a first tab 202 and a second tab 203 among a plurality of tabs; the first end (111) of the first test electrode 11 is arranged on the first tab 202, and the first end (121) of the second test electrode 12 is arranged on the second tab 203.

[0064] Referring to FIGS. 5-7, the first end of the first test electrode 11 is arranged on the first tab 202, the first end of the second test electrode 12 is arranged on the second tab 203, and a thermal trigger voltage is provided to the core based on the second end of the first test electrode 11 and the second end of the second test electrode 12 to trigger thermal runaway. It should be understood that by arranging the test electrodes on different tabs, a more comprehensive evaluation of the electrochemical performance and thermal stability of the core can be performed, thereby achieving more accurate electrochemical performance detection and thermal stability evaluation, and further providing a strong guarantee for quality control and safety evaluation during the core manufacturing process.

[0065] Referring to FIGS. 5-7, the first end of the first test electrode 11 is arranged opposite to the first end of the second test electrode 12, and the number of tabs spaced between the first tab 202 and the second tab 203 is within a preset value range.

[0066] Referring to FIGS. 5-7, the first end of the first test electrode 11 is arranged opposite to the first end of the second test electrode 12, which can provide more effective trigger energy to the core to trigger thermal runaway of the core in a shorter time.

[0067] Referring to FIGS. 5-7, the number of tabs spaced between the first tab 202 and the second tab 203 is within a preset value range, which can trigger thermal runaway of the core more quickly on the basis of obtaining accurate battery electrochemical performance data, thereby avoiding unnecessary waste of electrical energy.

[0068] It should be understood that the number of spaced tabs should satisfy that the core can undergo thermal runaway when a thermal trigger voltage is applied to the first test electrode and the second test electrode. It should be further understood that the number of spaced tabs should not be set too large to avoid a long thermal runaway trigger time. The number of spaced tabs should also not be set too small to avoid a short thermal runaway trigger time and an uncontrollable situation.

[0069] Based on the above principles, the preset value range in the present embodiment can be, for example, 0-5. Within the preset value range, the triggering of thermal runaway of the core can be ensured, and the time of thermal runaway can also be controlled within a reasonable range.

[0070] Exemplarily, the preset value range is 0.

[0071] Exemplarily, the preset value range is 2.

[0072] Exemplarily, the preset value range is 5.

[0073] In the embodiment, in order to more accurately simulate the actual thermal runaway of the core, the first end of the plurality of test electrodes is arranged at a target position on the target pole piece in the embodiment. The target position is determined according to the required thermal trigger position of the core. The required thermal trigger position of the core can be the position of the actual thermal runaway of the core.

[0074] Based on this, the embodiment can simulate the actual thermal runaway of the core based on the core, so as to more accurately evaluate the thermal stability of the core, and provide support for quality control and safety evaluation in the manufacturing process of the core, thereby guiding the subsequent production process adjustment.

[0075] The above embodiment describes the number and arrangement of the test electrodes in the core in detail, and the following embodiment describes the material and structure of the test electrodes.

[0076] It should be understood that the material selection of the test electrode can affect the performance of the test electrode and the accuracy of the test result, and therefore, a material with good electrical conductivity and thermal stability needs to be selected.

[0077] Optionally, the material of the test electrode includes copper, nickel or tungsten.

[0078] In the embodiment, since copper has the advantages of good electrical conductivity, thermal stability and low cost, nickel has the advantages of good electrical conductivity, thermal stability and corrosion resistance, and tungsten has the advantages of good electrical conductivity, high melting point and excellent thermal stability. Therefore, the embodiment adopts copper, nickel or tungsten as the material of the test electrode, which can ensure the performance of the test electrode and the accuracy and safety of the test result.

[0079] In the embodiment, the shape of the test electrode can be any shape as long as it can transmit the external thermal trigger voltage to the core, and the embodiment does not make special limitations.

[0080] Optionally, the shape of the test electrode in the embodiment can be a metal sheet, a metal wire or a metal coil.

[0081] Referring to FIGS. 2 and 5, the shape of the test electrode (11 and 12) is a metal wire, the metal wire has high flexibility and is suitable for accurate positioning test; referring to FIGS. 3 and 6, the shape of the test electrode (11 and 12) is a metal coil, the metal coil has a large conductive path and is suitable for high conductivity test; referring to FIGS. 4 and 7, the shape of the test electrode (11 and 12) is a metal sheet, the metal sheet has a large contact area and is suitable for large-area contact test.

[0082] Based on this, the test electrode in the embodiment can adapt to different test needs, so that the user can select the shape of the test electrode according to the actual needs, and provide strong support for quality control and safety evaluation in the core manufacturing process.

[0083] It should be understood that, in order to ensure the inherent function and normal use of the core, the first end of the test electrode is electrically insulated from the target pole piece in the present application, and the following embodiments are used to illustrate how the first end of the test electrode is electrically insulated from the target pole piece.

[0084] Optionally, the present embodiment provides two different ways to electrically insulate the first end of the test electrode from the target pole piece.

[0085] The first way is that, referring to FIG. 8, the first end of the first test electrode 11 is provided with a first electrical insulation layer 103, and the first end of the second test electrode 12 is provided with a first electrical insulation layer 103, which can electrically insulate the first test electrode 11 and the second test electrode 12 from a target pole piece 201.

[0086] Based on this, the electrical insulation of the first electrical insulation layer from the target pole piece can prevent the test electrode from directly contacting the target pole piece, thereby avoiding unnecessary electrochemical reaction or short circuit.

[0087] Furthermore, the first way only needs to provide the first electrical insulation layer on the test electrode, and the manufacturing process is relatively simple and flexible, and the first electrical insulation layer can protect the test electrode from being damaged during the operation of assembling the core.

[0088] The second way is that, referring to FIGS. 2-7 and 9, a target pole piece 201, a first pole piece 202 or a second pole piece 203 is provided with a second electrical insulation layer 204 on the contact area of the first end 111 of the first test electrode 11 and the first end 121 of the second test electrode 12, and the first end 111 of the first test electrode 11 and the first end 121 of the second test electrode 12 are electrically insulated from the target pole piece 201, the first pole piece 202 or the second pole piece 203 through the second electrical insulation layer 204.

[0089] Based on this, since the second electrical insulation layer 204 is arranged between the test electrode (11 and 12) and a target pole piece 201, a first pole piece 202 or a second pole piece 203, not only can the test electrode (11 and 12) be electrically insulated from a target pole piece 201, a first pole piece 202 or a second pole piece 203, but also can prevent the test electrode (11 and 12) from directly contacting a target pole piece 201, a first pole piece 202 or a second pole piece 203, thereby avoiding unnecessary electrochemical reaction or short circuit.

[0090] Furthermore, the second mode of directly disposing the second electrically insulating layer 204 on the target pole piece 201, the first pole piece 202 or the second pole piece 203 can provide more stable insulation effect and better thermal management performance.

[0091] Based on the above description, if higher flexibility and simplified manufacturing process are required, the first electrically insulating layer can be disposed at the first end of the test electrode. If more stable insulation effect and better thermal management performance are required, the second electrically insulating layer can be disposed on the contact area between the target pole piece and the test electrode. The specific selection should be based on the priority and technical requirements in actual application.

[0092] It should be understood that in order to further ensure the electrical insulation between the test electrode and the target pole piece, the first mode and the second mode can be used to respectively dispose the first electrically insulating layer at the first end of the test electrode and the second electrically insulating layer on the contact area between the target pole piece and the test electrode.

[0093] In the present embodiment, the following optional solutions are provided for the material of the first insulating layer and the second insulating layer.

[0094] The material of the first electrically insulating layer and the second electrically insulating layer can be polypropylene, polyethylene or polyimide.

[0095] It should be understood that in the pole core, selecting appropriate insulating material is crucial to ensure the functionality and reliability of the pole core. Polypropylene, polyethylene and polyimide are commonly used insulating materials with excellent performance.

[0096] Among them, polypropylene has good electrical insulation performance, which can effectively prevent electrical contact between the electrode and the pole piece. Polypropylene also has good mechanical strength and toughness, which can provide reliable physical protection for the pole piece or test electrode during the preparation process of the pole core. Polypropylene also has good resistance to various chemicals involved in the pole core, which can remain stable during the use of the pole core.

[0097] Polyethylene has high electrical insulation performance, which can effectively prevent electrical contact between the electrode and the pole piece. Polyethylene also has the advantage of good flexibility, which can adapt to electrodes and pole pieces of different shapes and sizes. Furthermore, polyethylene has good resistance to moisture and chemicals, making it suitable for use in various environmental conditions. Finally, polyethylene material has low cost, which is suitable for large-scale production and application.

[0098] Polyimide has excellent high-temperature stability, which can maintain its insulating properties and mechanical strength under high-temperature conditions. Polyimide also has good resistance to various chemicals in the pole core and can be used in the pole core. In addition, polyimide also has high mechanical strength and toughness, which can maintain stability during the use of the pole core and provide reliable physical protection for the test electrode. Finally, polyimide also has excellent electrical insulation properties, which can effectively prevent electrical contact between the electrode and the pole piece.

[0099] Based on the above description, selecting polypropylene, polyethylene or polyimide as the material of the first and second electrically insulating layers can provide excellent electrical insulation properties, thermal stability, chemical resistance and mechanical strength. The multifunctionality and cost-effectiveness of these materials make them ideal choices for insulating layers, which can effectively improve the accuracy and reliability of simulating the thermal runaway of the pole core.

[0100] In this embodiment, the thickness of the first and second insulating layers is also provided with the following optional scheme:

[0101] The thickness of the first and second electrically insulating layers in the above-mentioned manner is within a preset thickness range.

[0102] The first and second electrically insulating layers within the preset thickness range can ensure sufficient electrical insulation properties to prevent electrical contact between the test electrode and the pole piece, avoid unnecessary electrochemical reactions or short circuits, and also ensure consistent insulation effect between each test electrode and the pole piece, improving the reliability of the thermal runaway results.

[0103] In addition, the first and second electrically insulating layers use materials such as polypropylene, polyethylene and polyimide, and are controlled within a preset thickness range, which can provide good thermal stability to adapt to the working environment of the pole core under high-temperature conditions.

[0104] Finally, the first and second electrically insulating layers within the preset thickness range can provide sufficient mechanical strength and toughness to protect the test electrode and the pole piece from damage during the assembly of the pole core. In addition, the insulating layer within the preset thickness range can improve wear resistance, prolong the service life of the test electrode and the pole piece, and reduce the replacement frequency.

[0105] Based on the above description, the above-mentioned preset thickness range can be, for example, 10-50 μm. Within this preset thickness range, the first and second electrically insulating layers not only have sufficient mechanical strength and toughness to protect the test electrode and the pole piece from damage during the assembly of the pole core, but also can improve the wear resistance of the first and second electrically insulating layers, prolong the service life of the test electrode and the pole piece, and reduce the replacement frequency.

[0106] Exemplarily, the preset thickness range is 10 μm.

[0107] Exemplarily, the preset thickness range is 30 pm.

[0108] Exemplarily, the preset thickness range is 50 pm.

[0109] The application will describe the preparation process of the pole core in the form of specific examples as follows:

[0110] First step: test electrode preparation. The test electrode can be made of high-melting-point metal, including but not limited to copper, nickel, tungsten and the like. The shape of the electrode can be selected from a metal sheet, a metal wire or a metal coil.

[0111] Second step: test electrode built-in. At least two test electrodes are arranged on one layer of pole piece or at least two layers of pole piece of the pole core, and the position of the test electrode on the pole piece is adjusted according to the position requirement of triggering thermal runaway. Since the types of pole cores are different, different test electrode lead-out methods should be selected. The length is appropriately adjusted according to the position of the thermal trigger required by the pole core, and the part entering the pole core is wrapped with an insulating layer, so that the test electrode is insulated from the negative pole piece.

[0112] FIGS. 2-7 respectively show different electrode structures and electrode arrangement methods. Two high-melting-point metal wires (or metal coils, metal sheets) are arranged on the positive pole piece or the negative pole piece of the pole core. The two high-melting-point metal wires (or metal coils, metal sheets) can be located on the same layer of pole piece, or can be respectively located on different layers of pole piece. The area in contact with the pole piece is subjected to insulation treatment, and only the part of the metal exposed from the pole core is exposed.

[0113] Based on the above steps, the pole core with the test electrode structure can be obtained.

[0114] Second aspect, with reference to FIGS. 10 and 11, the application further provides a battery, which comprises at least one test pole 2, a packaging shell 3 and at least one pole core 1 according to any one of the first aspect. The pole core 1 is arranged in the interior of the packaging shell 3, and at least one test pole 2 extends from the interior of the packaging shell 3 to the exterior of the packaging shell 3 and is electrically insulated from the packaging shell 3. At least one target test pole in the at least one test pole 2 is connected to the second end of at least one test electrode (11 and / or 12) in the at least one pole core 1. The at least one test pole 2 is used to receive an external thermal trigger voltage.

[0115] The battery in the embodiment includes at least one set of test poles. Each test pole in the at least one set of test poles is connected to the second end of the corresponding test electrode in the corresponding pole core inside the packaging shell. The test pole in the at least one set of test poles is used to receive an external thermal trigger voltage to trigger thermal runaway of the battery outside the packaging shell.

[0116] When the battery in the embodiment is triggered to thermal runaway, the external thermal trigger voltage is transmitted to the inside of the pole core through the test pole to trigger thermal runaway of the battery. Since the structure and inherent function of the battery are not changed, the battery is closer to the real internal short thermal runaway mode when the test electrode is used to trigger thermal runaway. In addition, the thermal runaway voltage provided to the test pole can be stably controlled according to the external voltage source when the pole core thermal runaway simulation is performed using the battery. Therefore, the battery can provide a stable and controllable internal short thermal runaway mode to evaluate the safety performance of the battery.

[0117] It should be understood that the battery simulation of thermal runaway can find potential safety hazards in the design of the battery and improve the battery structure and material selection to improve the overall performance and safety of the battery. The optimized battery can meet the requirements of relevant safety regulations and standards to ensure market access of the battery product.

[0118] Optionally, referring to FIGS. 10 and 11, the battery in the embodiment further includes a set of working poles. The set of working poles extends from the inside of the packaging shell 3 to the outside of the packaging shell 3 and is electrically insulated from the packaging shell 3. The set of working poles is connected to the pole core 1 inside the packaging shell 3. The set of working poles is used to provide external electrical energy when the battery is working.

[0119] The set of working poles includes a positive pole 41 and a negative pole 42. The positive pole 41 and the negative pole 42 are connected to the outside when the battery provides external electrical energy. It should be understood that the outside can include any structure, device, equipment, or system that needs to supply electrical energy, and the embodiment of the present application does not make specific limitations.

[0120] In one example, referring to FIGS. 10 and 11, the embodiments of the present application can set two test poles (21 and 22) in a group of test poles 2 in the battery as the first target test pole and the second target test pole, which are connected one-to-one with the second ends of two test electrodes in at least one cell 1. In FIG. 10, the two test electrodes in the battery are arranged on different layer pole pieces (202 or 203), and in FIG. 11, the two test electrodes in the battery are arranged on the same layer pole piece (202 and 203), and a separator 205 is arranged between the two layer pole pieces (202 and 203).

[0121] In another example, referring to FIGS. 10 and 11, the embodiments of the present application can also set one test pole (21 or 22) in at least one group of test poles as the first target test pole and set one working pole (41 or 42) in a group of working poles as the second target test pole, wherein one of the first target test pole and the second target test pole is located in the part inside the packaging shell and connected with the second end of the test electrode in at least one cell, and the other is not connected with the test electrode in the cell and can also be used for other purposes.

[0122] It is worth noting that in FIGS. 10 and 11, only the case that the battery includes a group of test poles and one cell, and the number of test electrodes in the cell is two, and the number of test poles is also set to two is shown, but in practice, the battery can also include at least two cells as in the first aspect and at least two groups of test poles, and the number of cells can correspond to the number of groups of test poles. The test electrodes included in each cell can also be multiple, and based on this, the number of test poles in each group of test poles can also be multiple.

[0123] The above-mentioned battery can be any existing battery with the above-mentioned structure, and the embodiments of the present application do not make special limitations. For example, the above-mentioned battery can be a soft pack battery, a blade battery, a square aluminum shell battery, or a cylindrical battery.

[0124] The above-mentioned packaging shell is the external packaging of the battery, which is used to protect the internal components and provide structural support. The test pole is a conductive component of the battery, which is used to connect the internal circuit of the battery and the external circuit, and is electrically insulated from the packaging shell to prevent battery leakage and short circuit.

[0125] The packaging shell is usually made of insulating materials such as plastic or composite materials, but in some cases, metal materials can also be used with an insulating layer added in the key area, and the part of the packaging shell through which the test pole passes also needs to have good sealing performance to prevent electrolyte leakage or external contaminants from entering.

[0126] The test pole can be made of a material with good electrical conductivity, such as copper or aluminum, to ensure effective conduction of current. An insulating material, such as ceramic, plastic, or other high-insulation material, can be added to the surface of the test pole or the area where the test pole contacts the packaging shell to electrically insulate the packaging shell.

[0127] In the present embodiment, the above-mentioned battery can be provided with one or at least two electrode cores, which can be set according to requirements, and the present embodiment does not make specific limitations on this. The following will be described in detail with specific embodiments when the above-mentioned battery includes one electrode core and the connection between the electrode core and the test pole, and when the above-mentioned battery includes at least two electrode cores and the connection between the electrode core and the test pole.

[0128] In an optional embodiment, when the battery includes one electrode core, the battery includes a group of test poles, the group of test poles includes at least two test poles, at least two test poles are connected to the second end of at least one test electrode in the electrode core inside the packaging shell, and any two test poles of the at least one test pole are used to receive an external thermal trigger voltage outside the packaging shell. It should be understood that the remaining test poles can be used for other tests to enrich the functions of the battery, or can be used as backup target test poles when the current target test pole fails.

[0129] Based on this, an external voltage source can be used to apply a thermal trigger voltage to the target test pole outside the packaging shell to cause the battery to heat runaway, thereby simulating the real situation of the battery heat runaway and providing support for evaluating the safety performance of the battery.

[0130] In another optional embodiment, when the battery includes at least two electrode cores, the battery includes at least two groups of test poles, each group of test poles includes at least two test poles, at least one test pole in each group of test poles is connected to the second end of the corresponding test electrode in the corresponding electrode core inside the packaging shell, and the target test pole is used to receive an external thermal trigger voltage outside the packaging shell; wherein the target test pole can be any two test poles in the same group of test poles, or the target test pole can be any one test pole in the same group of test poles and any one working pole in the above-mentioned group of working poles.

[0131] It should be understood that when a group of test poles includes two test poles, the two test poles can be target test poles, or one of them can be a target test pole. When a group of test poles includes more than two test poles, one or two test poles in the group of test poles are the above-mentioned target test poles.

[0132] Based on this, the embodiment can select one or two test poles in any group of test poles to receive the thermal trigger voltage when triggering the thermal runaway of the battery. When one test pole in any group of test poles is selected to receive the thermal trigger voltage, one working pole in the above-mentioned group of working poles can be selected to receive the thermal trigger voltage at the same time. Based on this, the selectability of the target test pole is expanded. When a certain test pole in a group of test poles is electrically failed, other test poles in the group of test poles can be used as target test poles to ensure that the thermal runaway of the battery can be triggered effectively.

[0133] The embodiment can also select any two test poles or any one test pole in other groups of test poles to receive the thermal trigger voltage when one or more test poles in a group of test poles are failed when triggering the thermal runaway of the battery. This provides multiple possibilities for receiving the thermal trigger voltage and further ensures the effectiveness of triggering the thermal runaway.

[0134] In a third aspect, with reference to FIG. 12, the embodiment of the present application further provides a battery thermal runaway trigger device, which comprises a test power supply, a switch module, a control module (not shown), and the battery in the second aspect; the positive and negative poles of the test power supply are connected to the first target test pole 21 and the second target test pole 22 in the battery 4 in the second aspect respectively to form a test loop, the switch module is arranged in the test loop, and the control module is in communication connection with the test power supply and the switch module.

[0135] The control module is configured to determine the thermal runaway voltage according to the type of the battery and control the switch module to be closed, and control the test power supply to provide the thermal runaway voltage to the two target test poles to trigger the thermal runaway of the battery. The type of the battery can be obtained from the parameters of the battery or input by a user.

[0136] In the embodiment, the test power supply should be able to provide sufficient voltage and current to trigger the thermal runaway reaction of the battery. For example, the range of the power supply is 0V-1000V.

[0137] The switch module is arranged in the test loop and is configured to control the on-off of the current between the test power supply and the target test pole. The switch module can be a mechanical switch, a relay, or an electronic switch (such as a MOSFET).

[0138] It should be understood that different types of batteries can require different thermal runaway voltages. The control module can determine the appropriate thermal runaway voltage according to the type of the battery to trigger the thermal runaway of the battery.

[0139] The control module is further configured to control the switch module to close, so that the test power source and the two target test poles form a complete test loop. When the switch module is closed, the control module controls the test power source to provide a thermal runaway voltage to the two target test poles, and the thermal runaway voltage is transmitted to the inside of the battery through the test poles to trigger the thermal runaway reaction of the battery.

[0140] The thermal runaway voltage range includes 80V-120V, and the current range of the first target test pole and the second target test pole at the thermal runaway voltage includes 10A-30A.

[0141] The thermal runaway voltage in the thermal runaway voltage range can be used to trigger the thermal runaway of multiple types of batteries, that is, the thermal runaway reaction of different types of batteries can be effectively triggered in the thermal runaway voltage range.

[0142] Based on the thermal runaway voltage range, the current of the two target test poles and the inside of the battery can ensure that the reaction inside the battery is sufficient to trigger thermal runaway.

[0143] Based on the above description, the device in the embodiment can provide an accurate thermal runaway voltage to the battery according to the type of the battery, and can be applied to different types of batteries to ensure the effectiveness of the thermal runaway triggering of various types of batteries, and thus can be used for safety testing and research of different types of batteries.

[0144] In some examples, referring to FIG. 13, the device can further include a data acquisition module connected to the positive pole 41 and the negative pole 42 of the battery 4 and in communication with the control module.

[0145] The data acquisition module is configured to acquire the current voltage of the battery and / or the current temperature of the battery.

[0146] The control module is further configured to control the switch module to disconnect the test loop when the current voltage and / or the current temperature of the battery indicate that the battery is in a thermal runaway state.

[0147] Based on the device, before the thermal runaway voltage is applied to the two target test poles, the data acquisition module is connected to the positive and negative poles of the battery, the switch module is controlled by the control module to apply the thermal runaway voltage to the two target test poles by the power source, the current voltage and the current temperature of the battery are monitored in real time by the data acquisition module, and the current voltage and / or the current temperature of the battery are sent to the control module to determine whether the battery is in a thermal runaway state.

[0148] The determining, by the control module, whether the battery has thermal runaway can include: determining, by the control module, whether a current voltage of the battery meets a thermal runaway voltage and / or whether a current temperature meets a thermal runaway temperature, to determine whether the battery has thermal runaway.

[0149] The thermal runaway voltage and the thermal runaway temperature can be determined according to requirements of a national standard for the thermal runaway voltage and the thermal runaway temperature. In the national standard, the thermal runaway voltage can be less than 75% of a voltage of the battery, and the thermal runaway temperature can be greater than a maximum use temperature of the battery.

[0150] Therefore, the control module can determine whether the battery has thermal runaway, and in the case that the battery has thermal runaway, the control module controls the switch module to disconnect the test loop, to ensure safety of the thermal runaway triggering process.

[0151] In a fourth aspect, referring to FIG. 14, the embodiments of the present application further provide a battery thermal runaway triggering method, which includes the following steps:

[0152] S401, providing a battery including a first target test pole and a second target test pole.

[0153] S402, connecting one end of a test power supply to the first target test pole and connecting the other end of the test power supply to the second target test pole, to form a test loop.

[0154] S403, closing the test loop to provide power to the battery by the test power supply, to trigger thermal runaway of the battery.

[0155] The process of triggering thermal runaway of the battery by the method in the embodiments and analysis of results after triggering thermal runaway of the battery are described below by way of examples:

[0156] Before that, the currently used thermal runaway triggering method is introduced:

[0157] The most commonly used thermal runaway triggering method is the needle triggering method, but the needle triggering method has strict needle conditions, high thermal runaway degree, and heat production far greater than that of the foreign object built-in short circuit battery thermal runaway. The maximum temperature of the needle process and the average maximum temperature of the needle thermal runaway are 594.66℃, which is much higher than the maximum temperature of the core internal short thermal runaway; the maximum temperature of the needle thermal runaway has a range of 96.3℃, a standard deviation of 25.33, a coefficient of variation of 0.0426, and the consistency of the maximum temperature needs to be improved. According to the EUCAR (European Council for Automotive R&D, European Council for Automotive R&D), the risk level after the thermal runaway is 4, and the consistency is 5 / 11*100% = 45.45%, and the consistency of the thermal runaway phenomenon needs to be improved.

[0158] Before triggering the thermal runaway in this embodiment, first connect the test power supply, and select the appropriate range of the test power supply. The two ends of the test power supply are respectively connected to the lead-out ends of the two target test poles.

[0159] Triggering thermal runaway: set appropriate voltage, current, and time recording interval, and then use the test power supply to provide a test voltage to the two target test poles.

[0160] The thermal runaway triggering method provided in this embodiment is suitable for soft package batteries, blade batteries, square aluminum shell batteries, cylindrical batteries, etc.

[0161] Example 1: A soft package battery structure is used, and the positive electrode material is lithium iron phosphate. The test electrode is a nickel sheet with a width of 5 mm and a thickness of 0.08 mm, and the test electrode is arranged at the center of the large face of the battery. The test power supply voltage is set to 100 V, and the limit current is set to 20 A. After the test power supply is closed, the battery voltage rises briefly and then drops rapidly to 0 V, and the temperature on the surface of the battery rises rapidly to above 400℃. The battery smokes and thermal runaway occurs. Through experiments, the heat production ratio of the pole core to the electric energy is 61.34%, and the average value of the heat production ratio of the pole core to the electric energy repeated three times is 61.02%, indicating that the consistency of this embodiment is good. Compared with the thermal runaway triggering methods such as needling and heating, it is more close to the heat production ratio of the internal short circuit of foreign matter (55.09%).

[0162] Example 2: The above soft package battery structure is changed to a blade battery structure, and other experimental methods are the same as in Example 1. This embodiment can also stably trigger the battery thermal runaway. The average value of the heat production ratio of the pole core to the electric energy in the battery is 61.13%, which is more close to the heat production ratio of the internal short circuit of foreign matter (56.12%).

[0163] Example 3: The above soft package battery structure is changed to a cylindrical structure, and other experimental methods are the same as in Example 1. The device of this embodiment can also stably trigger the battery to occur thermal runaway.

[0164] Example 4: The above positive electrode material is changed to a ternary material, and the structure is a soft package battery. The test power supply voltage is set to 80 V, and the limit current is set to 10 A. Other experimental methods are the same as in Example 1. The thermal runaway triggering device in this embodiment can also stably trigger the battery to occur thermal runaway.

[0165] Example 5: The above positive electrode material is changed to a ternary material, and the structure is a square battery. The test power supply voltage is set to 80 V, and the limit current is set to 10 A. Other experimental methods are the same as in Example 1. The thermal runaway triggering device in this embodiment can also stably trigger the battery to occur thermal runaway.

[0166] Example 6: The above positive electrode material is replaced by a ternary material, and the structure is a cylindrical battery. The test power voltage is set to 80V, and the limit current is set to 10A. Other experimental methods are the same as in Example 1. The thermal runaway triggering method in this embodiment can also stably trigger the battery to generate thermal runaway.

[0167] Table 1 Comparison of different thermal runaway triggering methods

[0168] It should be understood that the closer the heat generation of the triggered thermal runaway to the heat generation of the real internal short circuit, the closer the two thermal runaways, and the more accurate the safety performance evaluation of the pole core and the battery by this triggering method. The internal short circuit of foreign matter is the most common mode of real internal short circuit. Table 1 compares the heat generation of different thermal runaway triggering methods, and the results show that the thermal runaway triggering method provided in this embodiment has the advantages of low input energy and heat generation close to the heat generation of real internal short circuit. In addition, the thermal runaway triggering method provided in this embodiment also has the advantages of good consistency and does not affect the assembly of the pole core.

[0169] It should be further understood that the results of the thermal runaway triggered by the thermal runaway triggering device provided in this embodiment are close to the thermal runaway of the real internal short circuit, and the safety performance evaluation is more accurate. Therefore, the safety protection is more accurate.

[0170] Based on the above description, it can be seen that the feasibility of the thermal runaway triggering method of this embodiment has been fully verified, and the universality of the method has been confirmed in different types of batteries.

[0171] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent substitutions for part or all of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pole core, wherein, A thermal runaway trigger test for a battery, the pole core comprising a pole core body (1) and at least two test electrodes (10); the pole core body (1) has a plurality of pole pieces (20) arranged at intervals inside; The test electrode (10) has a first end (101) and a second end (102), the first end (101) is arranged on a target pole piece (201) in the plurality of pole pieces (20) and is electrically insulated from the target pole piece (201), and the second end (102) is located outside the pole core body (1) and is used to receive a thermal trigger voltage.

2. The pole core of claim 1, wherein, The at least two test electrodes (10) include a first test electrode (11) and a second test electrode (12); The first end (111) of the first test electrode (11) and the first end (121) of the second test electrode (12) are arranged on the same target pole piece (201).

3. The pole core of claim 2, wherein, The distance between the first end (111) of the first test electrode (11) and the first end (121) of the second test electrode (12) is within a thermal runaway distance range.

4. The pole core of claim 3, wherein, The thermal runaway distance range is 1-3mm.

5. The pole core of claim 1, wherein, The at least two test electrodes (10) include a first test electrode (11) and a second test electrode (12); the target pole piece (201) includes a first pole piece (202) and a second pole piece (203) in the plurality of pole pieces (20); The first end (111) of the first test electrode (11) is arranged on the first pole piece (202), and the first end (121) of the second test electrode (12) is arranged on the second pole piece (203).

6. The pole core of claim 5, wherein, The position of the first end (111) of the first test electrode (11) on the first pole piece (202) and the position of the first end (121) of the second test electrode (12) on the second pole piece (203) are arranged correspondingly, and the number of pole pieces between the first pole piece (202) and the second pole piece (203) is within a preset value range.

7. The pole core of claim 6, wherein, The preset value range is 0-5.

8. The pole core according to any one of claims 1 to 7, wherein The first end (101) of the test electrode (10) is provided with a first electrical insulation layer (103), and the first end (101) of the test electrode (10) is electrically insulated from the target pole piece (201) through the first electrical insulation layer (103); Or, a second electrical insulation layer (204) is arranged on the contact area between the target pole piece (201) and the first end (101) of the test electrode (10), and the first end (101) of the test electrode (10) is electrically insulated from the target pole piece (201) through the second electrical insulation layer (204).

9. The pole core of claim 8, wherein, The material of the first electrical insulation layer (103) or the second electrical insulation layer (204) includes polypropylene, polyethylene or polyimide.

10. The pole core of claim 8 or 9, wherein, The thickness of the first electrical insulation layer (103) or the second electrical insulation layer (204) is within a preset thickness range.

11. The pole core of claim 10, wherein, The preset thickness range is 10-50μm.

12. The pole core of any one of claims 1-11, wherein, The material of the test electrode (10) includes copper, nickel or tungsten; And / or, the shape of the test electrode (10) includes a metal sheet, a metal wire or a metal coil.

13. A battery, wherein, The battery further comprises at least one set of test electrode posts (2), a packaging shell (3) and at least one electrode core (1) as claimed in any one of claims 1-12; The electrode core (1) is arranged inside the packaging shell (3), and the at least one set of test electrode posts (2) extends from inside the packaging shell (3) to outside the packaging shell (3) and is electrically insulated from the packaging shell (3); At least one target test electrode post in the at least one set of test electrode posts (2) is connected to the second end (102) of at least one test electrode (10) in the at least one electrode core (1) inside the packaging shell (3); The at least one set of test electrode posts (2) is used to receive an external thermal trigger voltage.

14. The battery of claim 13, wherein, The battery further comprises a set of working electrode posts, which extend from inside the packaging shell (3) to outside the packaging shell (3) and are electrically insulated from the packaging shell (3); The set of working electrode posts is connected to the electrode core (1) inside the packaging shell (3); The set of working electrode posts is used to provide external electrical energy when the battery is working.

15. The battery of claim 14, wherein, One test electrode post in the at least one set of test electrode posts (2) is a first target test electrode post (21), and one working electrode post in the set of working electrode posts is a second target test electrode post (22); One of the first target test electrode post (21) and the second target test electrode post (22) is connected to the second end (102) of a test electrode (10) in the at least one electrode core (1) inside the packaging shell (3); Or, two test electrode posts in the at least one set of test electrode posts (2) are a first target test electrode post (21) and a second target test electrode post (22); The first target test electrode post (21) and the second target test electrode post (22) are connected to the second ends (102) of two test electrodes (10) in the at least one electrode core (1) one by one inside the packaging shell (3).

16. A thermal runaway triggering device, wherein, The battery further comprises a test power supply, a switch module, a control module and the battery as claimed in any one of claims 13-15; The positive and negative poles of the test power supply are connected to the first target test electrode post (21) and the second target test electrode post (22) in the battery (4) respectively to form a test loop, the switch module is arranged in the test loop, and the control module is in communication connection with the test power supply and the switch module; The control module is used to determine a thermal runaway voltage according to the type of the battery, control the switch module to be closed, control the test power supply to provide the thermal runaway voltage to the two target test electrode posts to trigger the battery to have thermal runaway.

17. The thermal runaway trigger device of claim 16, wherein, The battery further comprises a data acquisition module, which is connected to a set of working electrode posts of the battery (4) and is in communication connection with the control module; wherein the set of working electrode posts comprises a positive electrode post (41) and a negative electrode post (42). The data acquisition module is configured to acquire a current voltage of the battery (4) and / or a current temperature of the battery (4). The control module is further configured to control the switch module to be turned off to disconnect the test loop in a case where the current voltage and / or the current temperature indicates that the battery (4) is in thermal runaway.

18. The thermal runaway trigger device of claim 16 or 17, wherein, The thermal runaway voltage ranges from 80V to 120V, and the current in the first target test terminal (21) and the second target test terminal (22) ranges from 10A to 30A at the thermal runaway voltage.

19. A battery thermal runaway triggering method, wherein, The method comprises the following steps: providing a battery comprising a first target test terminal and a second target test terminal; connecting one end of a test power supply to the first target test terminal and connecting the other end of the test power supply to the second target test terminal to form a test loop; closing the test loop to provide the battery with electric energy by the test power supply to trigger thermal runaway of the battery.

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