Battery safety testing device, system and method

Abstract

The present application relates to a battery safety testing device, system and method. The battery safety testing device includes a shell, a first test battery, a second test battery, a heating device, a control device and a first temperature acquisition device. The shell defines a accommodating space; the first test battery is arranged in the accommodating space; the second test battery is arranged in the accommodating space, the internal materials of the first test battery and the second test battery are the same as the internal materials of the battery to be tested, and the sum of the energy of the first test battery and the second test battery is less than the energy of the battery to be tested; the heating device is arranged in the accommodating space and is sandwiched between the first test battery and the second test battery; the control device is connected to the heating device signal for controlling the operation of the heating device; the first temperature acquisition device is arranged on the first test battery and / or the second test battery, and is connected to the control device signal. The battery safety testing device provided in the present application has high safety during the battery safety test.

Description

Technical Field

[0001] The present application relates to the technical field of battery safety testing, and in particular to a battery safety testing device, system and method. Background Art

[0002] With the vigorous development of new energy vehicles, the safety of automotive power batteries has become increasingly prominent. When a power battery cell experiences a thermal runaway accident, the violent physical and chemical reaction process will release huge amounts of energy in a very short period of time, causing a sharp rise in temperature, and even fire and explosion. In actual usage scenarios, since power battery cells are composed of power sources in the form of modules, thermal runaway of the battery cell may also cause thermal runaway expansion accidents, seriously threatening the safety of the driver.

[0003] The causes of power battery safety accidents can be summarized as mechanical abuse, thermal abuse, electrical abuse, etc. In order to explore the thermal behavior of power batteries under thermal abuse conditions, researchers need to conduct a large number of thermal safety experiments on power batteries.

[0004] In traditional technology, when conducting thermal safety experiments and tests on power batteries, the power batteries to be tested are usually heated before a series of tests are performed. However, in order to meet the demand for power, the energy density of today's batteries is relatively large, which makes safety tests dangerous and less safe. Summary of the invention

[0005] Based on this, it is necessary to provide a battery safety testing device, system and method to address the above technical problems.

[0006] A battery safety testing device, comprising:

[0007] A housing defines a containing space;

[0008] A first test battery is disposed in the accommodation space;

[0009] A second test battery, disposed in the accommodation space, wherein the internal materials of the first test battery and the second test battery are the same as the internal materials of the battery to be tested, and the sum of the energies of the first test battery and the second test battery is less than the energy of the battery to be tested;

[0010] A heating device, disposed in the accommodation space and sandwiched between the first test battery and the second test battery;

[0011] A control device, connected to the heating device by signal, and used to control the operation of the heating device;

[0012] The first temperature acquisition device is arranged on the first test battery and / or the second test battery and is connected to the control device by signal.

[0013] In one embodiment, the heating device comprises:

[0014] A heat-conducting support body, disposed in the accommodation space and sandwiched between the first test battery and the second test battery, the heat-conducting support body being provided with a heating hole;

[0015] The heating body is arranged in the heating hole.

[0016] In one of the embodiments, the heating body and the heating hole are interference fit.

[0017] In one embodiment, the heating hole is a through hole.

[0018] In one of the embodiments, the battery safety testing device further includes: the material of the thermal conductive support body is iron alloy or copper alloy.

[0019] In one embodiment, the outer dimensions of the housing are the same as the outer dimensions of the battery to be tested.

[0020] A battery thermal management performance testing system, comprising:

[0021] A battery safety testing device as described above;

[0022] a thermal management device, configured to perform thermal management on the first test battery, the second test battery, and the heating device;

[0023] The control device is further used to control the heating device to operate so as to simulate the thermal behavior of the battery to be tested.

[0024] A battery thermal runaway diffusion test system, comprising:

[0025] A battery safety testing device as described above;

[0026] A clamping device, wherein the housing is clamped on the clamping device;

[0027] A diffusion battery cell, clamped in the clamping device and arranged in close contact with the shell;

[0028] A second temperature collection device is provided on the diffusion battery cell;

[0029] The control device is also used to control the operation of the heating device according to the temperature data collected by the first temperature collection device to simulate the thermal runaway behavior of the battery to be tested.

[0030] A method for testing the thermal management performance of a battery using the battery thermal management performance testing system as described above comprises:

[0031] Controlling the heating device to operate by the control device to heat the first test battery and the second test battery;

[0032] Collecting the temperature of the first test battery and / or the second test battery by the first temperature collecting device to obtain temperature data;

[0033] The control device controls the heating device to operate according to the temperature data to simulate the thermal behavior of the battery to be tested;

[0034] Monitor changes in the thermal behavior of the battery to be tested under the action of the thermal management device to determine the performance of the thermal management device.

[0035] In one of the embodiments, the thermal behavior of the battery to be tested includes at least one of normal charging thermal behavior, normal discharging thermal behavior, overcharging thermal behavior and over-discharging thermal behavior.

[0036] A battery safety testing method using the battery thermal runaway diffusion testing system as described above comprises:

[0037] Controlling the heating device to operate by the control device to heat the first test battery and the second test battery;

[0038] Collecting the temperature of the first test battery and / or the second test battery by the first temperature collecting device to obtain temperature data;

[0039] The control device controls the heating device to operate according to the temperature data to simulate the thermal runaway behavior of the battery to be tested;

[0040] The temperature of the diffusion battery cell is collected by the second temperature collection device to analyze the thermal runaway diffusion process of the diffusion battery cell.

[0041] In the battery safety testing device, system and method provided in the embodiment of the present application, the battery safety testing device includes the housing, the first test battery, the second test battery, the heating device, the control device and the first temperature acquisition device. The sum of the energy of the first test battery and the second test battery is less than the total energy of the battery to be tested, and the heating temperature, heating conditions, etc. of the heating device can be accurately controlled by the control device, so compared with directly heating the battery to be tested, the battery safety testing process provided by the embodiment of the present application is relatively safe. At the same time, the sum of the energy of the first test battery and the second test battery is less than the energy of the battery to be tested, so compared with directly using the battery to be tested for testing, the volume and mass are effectively reduced, thereby effectively saving the cost of safety testing. At the same time, the internal materials of the first test battery and the second test battery are the same as the internal materials of the battery to be tested, so the experimental results obtained using the battery safety testing device are highly consistent with the results of directly using the battery to be tested. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic diagram of the structure of a battery safety testing device provided in one embodiment of the present application;

[0043] Figure 2 A schematic diagram of the explosion structure of a battery safety testing device (excluding the control device and the first temperature acquisition device) provided in one embodiment of the present application;

[0044] Figure 3 A schematic diagram of the structure of a battery thermal management performance test system provided in one embodiment of the present application;

[0045] Figure 4 A schematic diagram of the structure of a thermal runaway diffusion test system provided in one embodiment of the present application;

[0046] Figure 5 A thermal runaway temperature curve diagram of a battery to be tested provided in one embodiment of the present application;

[0047] Figure 6 A schematic flow chart of a method for performing a battery safety test using a battery thermal management performance test system according to an embodiment of the present application;

[0048] Figure 7 A schematic flow chart of the steps of a method for performing a battery safety test using a battery thermal runaway diffusion test system provided in one embodiment of the present application.

[0049] Description of reference numerals:

[0050] Battery safety test device 10

[0051] Housing 100

[0052] Accommodation Space 101

[0053] First test battery 210

[0054] Second test battery 220

[0055] Heating device 230

[0056] Thermal conductive support 231

[0057] Heating body 232

[0058] Heating hole 233

[0059] Control device 300

[0060] First temperature collection device 400

[0061] Thermal management device 30

[0062] Clamping device 40

[0063] First clamping plate 410

[0064] Second splint 420

[0065] Connecting rod 430

[0066] Mica sheet 440

[0067] Diffusion battery cell 50

[0068] Second temperature collecting device 60 DETAILED DESCRIPTION

[0069] In order to make the purpose, technical solution and advantages of the present application more clear, the battery safety testing device, system and method of the present application are further described in detail below through embodiments and in combination with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application.

[0070] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of this application, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0071] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0072] One embodiment of the present application provides a battery safety testing device 10 for testing the thermal safety of a battery to be tested. The thermal safety may include but is not limited to the thermal behavior change of the battery to be tested at high temperature, the thermal runaway behavior, the thermal runaway diffusion (also known as heat spread, etc.), the performance of the thermal management device, etc. The battery to be tested may be a lithium-ion battery.

[0073] See also Figure 1 and Figure 2 The battery safety testing device 10 includes a housing 100 , a first test battery 210 , a second test battery 220 , a heating device 230 , a control device 300 and a first temperature acquisition device 400 .

[0074] The housing 100 defines a receiving space 101. The housing 100 may be a cubic structure, a cylindrical structure or other irregularly shaped structures. The shape of the housing 100 may be set according to the shape of the battery to be tested. For example, if the battery to be tested is a square battery, the shape of the housing 100 may be square; if the shape of the battery to be tested is a cylindrical battery, the shape of the battery to be tested may be cylindrical. The housing 100 is used to accommodate other components. The first test battery 210, the second test battery 220, and the heating device 230 are all arranged in the receiving space 101. In one embodiment, the housing 100 may be a structure with an open top to facilitate external wiring and measurement of the first test battery 210, the second test battery 220 and the heating device 230. The material of the housing 100 may be selected according to actual needs. In some specific embodiments, the material of the housing 100 may be a material that is resistant to high temperatures and has good thermal conductivity. For example, the material of the housing 100 may be a high temperature resistant metal material: iron alloy (such as stainless steel) or copper alloy, etc. The housing 100 may have a certain thickness, so as to have a certain strength to resist deformation of the first test battery 210 and the second test battery 220 caused by thermal expansion.

[0075] The first test battery 210 and the second test battery 220 can be homemade batteries or purchased finished batteries. The first test battery 210 and the second test battery 220 can be soft-pack batteries or hard-shell batteries. In one embodiment, the first test battery 210 and the second test battery 220 are both soft-pack batteries for easy processing and manufacturing. The internal materials of the first test battery 210 and the second test battery 220 are the same as the internal materials of the battery to be tested. Take the wound battery as an example, that is, the core material of the first test battery 210 and the second test battery 220 is the same as the core material of the battery to be tested. The sum of the energy of the first test battery 210 and the second test battery 220 is less than the energy of the battery to be tested. Battery energy refers to the energy stored in the battery. The size, energy, shell material, packaging form, etc. of the first test battery 210 and the second test battery 220 can be the same or different.

[0076] The heating device 230 is sandwiched between the first test battery 210 and the second test battery 220. In other words, the first test battery 210 and the second test battery 220 are respectively arranged on both sides of the heating device 230. The heating device 230 is used for heating. The shape, structure, heating method, etc. of the heating device 230 are not limited in any way, as long as heating can be achieved. In one embodiment, the housing 100, the first test battery 210, the second test battery 220 and the heating device 230 are all square structures. The lengths of the first test battery 210, the second test battery 220 and the heating device 230 are all the same as the length of the housing 100; the heights of the first test battery 210, the second test battery 220 and the heating device 230 are all the same as the height of the housing 100. The first test battery 210, the heating device 230 and the second test battery 220 form a "sandwich" structure and occupy the entire accommodation space 101.

[0077] The control device 300 is connected to the heating device 230 by signal, and is used to control the operation of the heating device 230. The control device 300 can control the opening, closing, power size, etc. of the heating device 230. The structure, model, etc. of the control device 300 are not limited in any way, as long as they can achieve their functions. At the same time, the control device 300 is also connected to the first temperature acquisition device 400 by signal. The temperature collected by the first temperature acquisition device 400 can be transmitted to the control device 300. The control device 300 can also adjust and control the heating device 230 according to the temperature information collected by the first temperature acquisition device 400.

[0078] The first temperature acquisition device 400 includes but is not limited to a thermocouple, etc., and the present embodiment of the application does not impose any restrictions on the model, structure, etc. of the first temperature acquisition device 400. The first temperature acquisition device 400 can be set inside or on the surface of the first test battery 210 or the second test battery 220 or the first test battery 210 and the second test battery 220 to collect the internal temperature of the battery. It should be noted that Figure 1 In the figure, the first temperature acquisition device 400 is disposed inside the first test battery 210 and the second test battery 220, and the symbols in the figure are only used for indication.

[0079] The functions and implementation principles of the battery safety testing device 10 are described below:

[0080] The battery safety testing device 10 can implement at least the following three testing functions:

[0081] 1) Thermal behavior characteristics test of the battery to be tested;

[0082] The heating device 230 is controlled by the control device 300 to work (heating conditions, heating temperature, etc. can be controlled), and the heat of the heating device 230 is transferred to the first test battery 210 and the second test battery 220, so as to heat the first test battery 210 and the second test battery 220. The temperature change of the first test battery 210 and / or the second test battery 220 is monitored by the first temperature acquisition device 400, and the thermal behavior of the first test battery 210 and / or the second test battery 220 under different heating conditions can be obtained, so that the thermal behavior characteristics of the first test battery 210 and the second test battery 220 can be qualitatively analyzed. Since the internal materials of the first test battery 210 and the second test battery 220 are the same as the internal materials of the battery to be tested, the qualitative thermal behavior characteristics of the first test battery 210 and the second test battery 220 can characterize the qualitative thermal behavior characteristics of the battery to be tested, so as to study the thermal safety of the battery to be tested.

[0083] In this process, firstly, since the sum of the energies of the first test battery 210 and the second test battery 220 is less than the total energy of the battery to be tested, and the heating temperature and heating conditions of the heating device 230 can be controlled by the control device 300, the safety of the test process is higher than directly performing a heating test on the battery to be tested. Secondly, since the sum of the energies of the first test battery 210 and the second test battery 220 is less than the energy of the battery to be tested, the cost of safety testing can be effectively saved.

[0084] 2) Thermal management safety testing;

[0085] See also Figure 3 , Figure 3 The figure is a schematic diagram of a safety test using a battery thermal management performance test system. The battery thermal management performance test system includes a thermal management device 30, the battery safety test device 10 and a second temperature acquisition device 60. The thermal management device 30 is used to perform thermal management on the battery, for example: cooling the battery when the temperature is too high, and heating the battery when the temperature is too low. When the thermal management device 30 is cooled, air cooling, liquid cooling, phase change cooling or mixed cooling may be adopted. It should be noted that the thermal management device 30 may include a thermal management control component and a heating component, a refrigeration component, etc. Among them, the heating component, the refrigeration component, etc. may be installed inside the housing 100, Figure 3 Not shown. Figure 3The thermal management device 30 is only used for illustration and does not represent the entire structure of the thermal management device 30.

[0086] The heating device 230 is controlled to work (the heating temperature and the like can be controlled) by the control device 300. The heat of the heating device 230 is transferred to the first test battery 210 and the second test battery 220, so as to heat the first test battery 210 and the second test battery 220. In this process, the heat emitted by the first test battery 210 and the second test battery 220, plus the heat emitted by the heating device 230, can be regarded as the heat generated by the battery to be tested, that is, the battery to be tested can be simulated by the first test battery 210, the second test battery 220 and the heating device 230.

[0087] The first test battery 210, the heating device 230 and the second test battery 220 (i.e. Figure 3 The control device 300 adjusts the heating power of the heating device 230, etc., so that the total heat generated by the first test battery 210, the second test battery 220 and the heating device 230 is the same as the heat change curve of the battery under test in certain working processes, thereby simulating the thermal behavior of the battery under test in various working processes, such as simulating the thermal behavior of the battery under test during normal charging and discharging, simulating the thermal behavior of the battery under test when overcharge or over-discharge occurs, and simulating other specific thermal behaviors of the battery under test. In the process of simulating thermal behavior, the temperature data is collected by the first temperature acquisition device 400 at the same time, so as to monitor the thermal behavior of the battery under test simulated during the working process of the thermal management device 30, and then explore the function of the thermal management device 30. For example, determine whether the cooling function of the thermal management device 30 is normal, whether the function is perfect, etc., so as to facilitate the improvement of the thermal management device 30. At the same time, it can also be studied whether the battery under test has a temperature-dangerous position when the thermal management device 30 is working, and the temperature-dangerous position refers to a position where the thermal management device 30 cannot effectively cool down.

[0088] During this process, the first test battery 210, the heating device 230 and the second test battery 220 work simultaneously to simulate the battery to be tested. Since the internal materials of the first test battery 210 and the second test battery 220 are the same as the internal materials of the battery to be tested, and the sum of the energy of the first test battery 210 and the second test battery 220 is less than the energy of the battery to be tested, it is not only possible to simulate the battery to be tested more closely, but also to save costs. Moreover, the heating device 230 can be controlled by the control device 300 to simulate various thermal behaviors of the battery to be tested, and to implement tests in various scenarios of thermal management. Moreover, the temperature is controllable, making the test process safer.

[0089] 3) Thermal runaway diffusion test of the battery to be tested on adjacent battery cells;

[0090] See also Figure 4 , you can use Figure 4 The thermal runaway diffusion test system shown tests the thermal runaway diffusion of the battery to be tested to the adjacent battery cells. The thermal runaway diffusion test system includes a clamping device 40, a battery safety test device 10, a diffusion battery cell 50 and a second temperature acquisition device 60. The housing 100, the first test battery 210, the second test battery 220, and the heating device 230 are clamped together in the clamping device 40. At the same time, the diffusion battery cell 50 is clamped on one or both sides of the housing 100 to test the thermal runaway diffusion of the adjacent diffusion battery cell 50 when the battery to be tested has thermal runaway. The clamping device 40 may include a first clamping plate 410, a second clamping plate 420, and a connecting rod 430 connecting the first clamping plate 410 and the second clamping plate 420. The materials of the first clamping plate 410, the second clamping plate 420 and the connecting rod 430 may be, but are not limited to, stainless steel, etc. A mica sheet 440 may be provided between the housing 100 or the diffusion battery cell 50 and the clamping plate. The mica sheet 440 has a relatively small thermal conductivity, which can reduce the heat transfer of the battery safety testing device 10 or the diffusion battery cell 50 and improve the accuracy of the test.

[0091] By controlling the operation of the heating device 230 through the control device 300 and adjusting the heating power of the heating device 230, etc., the total energy generated by the first test battery 210, the second test battery 220 and the heating device 230 can be equal to the total energy of the battery to be tested. In other words, the difference between the energy sum of the first test battery 210 and the second test battery 220 and the energy of the battery to be tested is compensated by the heating device 230, so that the temperature change curve thereof is the same as the temperature change curve of the battery to be tested when it is in thermal runaway, such as Figure 5 shown.

[0092] That is, the heating device 230 is used to compensate for the lack of energy, so that the battery safety testing device 10 simulates the thermal runaway of the battery to be tested, and the temperature change of the diffusion battery cell 50 is monitored by the second temperature acquisition device 60, thereby realizing the test of the thermal runaway diffusion caused by the thermal runaway of the test battery to be tested.

[0093] In this process, the control device 300 controls the heating device 230 to heat to compensate for the energy difference between the first test battery 210 and the second test battery 220 and the battery to be tested, which not only saves costs, but also makes the temperature of thermal runaway precisely controllable, highly safe, and the simulated thermal runaway diffusion situation is more accurate and realistic.

[0094] In this embodiment, the battery safety test device 10 includes the housing 100, the first test battery 210, the second test battery 220, the heating device 230, the control device 300 and the first temperature acquisition device 400. The sum of the energy of the first test battery 210 and the second test battery 220 is less than the total energy of the battery to be tested, and the heating temperature and heating conditions of the heating device 230 can be accurately controlled by the control device 300, so compared with directly heating the battery to be tested, the battery safety test process provided by this embodiment is relatively safe. At the same time, the sum of the energy of the first test battery 210 and the second test battery 220 is less than the energy of the battery to be tested, so compared with directly using the battery to be tested for testing, the volume and mass are effectively reduced, thereby effectively saving the cost of safety testing. At the same time, the internal materials of the first test battery 210 and the second test battery 220 are the same as the internal materials of the battery to be tested, so the experimental results obtained by using the battery safety test device are highly consistent with the results of directly using the battery to be tested for testing.

[0095] In one embodiment, the heating device 230 includes a heat conductive support 231 and a heating body 232. The heat conductive support 231 is disposed in the accommodation space 101 and sandwiched between the first test battery 210 and the second test battery 220. The heat conductive support 231 is provided with a heating hole 233. The heating body 232 is disposed in the heating hole 233.

[0096] The material of the thermally conductive support body 231 is made of a thermally conductive material. The thermally conductive support body 231 is used to support the heating body 232 and conduct heat to the first test battery 210 and the second test battery 220. In one embodiment, the material of the thermally conductive support body 231 can be a high temperature resistant metal. For example, it can be an iron alloy (such as stainless steel) or a copper alloy. The structure and shape of the thermally conductive support body 231 can be selected according to requirements. In one embodiment, the shape of the thermally conductive support body 231 is square, and the height and length of the thermally conductive support body 231 are the same as the height and length of the shell 100. The thickness of the thermally conductive support body 231 is equal to the thickness of the accommodating space 101 minus the thickness of the first test battery 210 and the thickness of the second test battery 220.

[0097] The heat conductive support body 231 may be provided with one or more heating holes 233 along the height direction or the length direction. The heating holes 233 may be blind holes or through holes. When the heating holes 233 are through holes, the space that can accommodate the heating body 232 is increased, which can improve the space utilization.

[0098] The heating body 232 is disposed in the heating hole 233. The heating body 232 may be electrically heated, or may be magnetic induction heated, etc. In one embodiment, the heating body 232 is electrically heated. The heating body 232 may be a heating rod. In other embodiments, the shape of the heating body 232 matches that of the heating hole 233, and the heating body 232 and the heating hole 233 are interference fit, so that the heating body 232 and the heating hole 233 are fully in contact, and the thermal conductivity is effectively improved.

[0099] In one embodiment, the outer dimensions of the shell 100 are the same as those of the battery to be tested, so that the battery safety testing device 10 is closer to the battery to be tested, and is also easier to arrange during tests such as battery thermal runaway diffusion testing or battery thermal management performance testing, and has strong versatility.

[0100] An embodiment of the present application also provides a battery thermal management performance test system, which includes the battery safety test device as described above and the thermal management device 30. The thermal management device 30 is used to perform thermal management on the first test battery 210, the second test battery 220 and the heating device 230. The control device 300 is also used to control the operation of the heating device 230 to simulate the thermal behavior of the battery to be tested.

[0101] In one embodiment, the thermal behavior of the battery to be tested includes at least one of normal charging thermal behavior, normal discharging thermal behavior, overcharging thermal behavior and over-discharging thermal behavior.

[0102] See also Figure 6 One embodiment of the present application further provides a method for performing a battery safety test using the battery thermal management performance test system as described above, the method comprising:

[0103] S110, controlling the heating device 230 to work by the control device 300 to heat the first test battery 210 and the second test battery 220;

[0104] S120, collecting the temperature of the first test battery 210 and / or the second test battery 220 by the first temperature collecting device 400 to obtain temperature data;

[0105] S130, the control device 300 controls the heating device 230 to operate according to the temperature data to simulate the thermal behavior of the battery to be tested;

[0106] S140 , monitoring changes in the thermal behavior of the battery to be tested under the action of the thermal management device 30 to determine the performance of the thermal management device 30 .

[0107] In this embodiment, the working principle and beneficial effects of the battery thermal management performance testing system and method are the same as those of Figure 3 The embodiments are described in detail and will not be repeated here.

[0108] The embodiment of the present application also provides a battery thermal runaway diffusion test system, comprising the battery safety test device as described above, the clamping device 40, the diffusion battery cell 50 and the second temperature acquisition device 60. The shell 100 and the diffusion battery cell 50 are both clamped in the clamping device 40, and the diffusion battery cell 50 is arranged in close contact with the shell 100. The second temperature acquisition device 60 is arranged in the diffusion battery cell 50. The control device 300 is also used to control the operation of the heating device 230 according to the temperature data collected by the first temperature acquisition device 400 to simulate the thermal runaway behavior of the battery to be tested.

[0109] See also Figure 7 One embodiment of the present application further provides a method for performing a battery safety test using the battery thermal runaway diffusion test system as described above, the method comprising:

[0110] S210, controlling the heating device 230 to work by the control device 300 to heat the first test battery 210 and the second test battery 220;

[0111] S220, collecting the temperature of the first test battery 210 and / or the second test battery 220 by the first temperature collection device 400 to obtain temperature data;

[0112] S230, the control device 300 controls the heating device 230 to operate according to the temperature data to simulate the thermal runaway behavior of the battery to be tested;

[0113] S240 , collecting the temperature of the diffusion battery cell 50 by the second temperature collecting device 60 to analyze the thermal runaway diffusion process of the diffusion battery cell 50 .

[0114] In this embodiment, the working principle and beneficial effects of the battery thermal runaway diffusion test system and method are the same as those of Figure 4 and Figure 5 The embodiments are described in detail and will not be repeated here.

[0115] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0116] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery safety testing device, characterized in that: include: A shell (100) defines a containing space (101); the shell (100) is clamped on a clamping device (40); a mica sheet (440) is arranged between the shell (100) and a clamping plate of the clamping device (40) to reduce heat transfer of the battery safety testing device; A first test battery (210) is disposed in the accommodation space (101); a second test battery (220) disposed in the accommodation space (101), wherein the internal materials of the first test battery (210) and the second test battery (220) are the same as the internal materials of the battery to be tested, and the sum of the energies of the first test battery (210) and the second test battery (220) is less than the energy of the battery to be tested; A heating device (230) is disposed in the accommodating space (101) and sandwiched between the first test battery (210) and the second test battery (220); A control device (300) is connected to the heating device (230) by signal, and is used to control the heating device (230) to work, so as to compensate for the difference between the energy of the first test battery (210), the second test battery (220) and the energy of the battery to be tested, so that the total heat generated by the first test battery (210), the second test battery (220) and the heating device (230) is consistent with the heat change curve of the battery to be tested during operation; A first temperature acquisition device (400) is arranged on the first test battery (210) and / or the second test battery (220) and is signal-connected to the control device (300).

2. The battery safety testing device according to claim 1, characterized in that: The heating device (230) comprises: A heat-conductive support body (231) is disposed in the accommodation space (101) and sandwiched between the first test battery (210) and the second test battery (220), and the heat-conductive support body (231) is provided with a heating hole (233); The heating body (232) is arranged in the heating hole (233).

3. The battery safety testing device according to claim 2, characterized in that: The heating body (232) and the heating hole (233) are interference fit.

4. The battery safety testing device according to claim 2, characterized in that: The heating hole (233) is a through hole.

5. The battery safety testing device according to claim 2, characterized in that: Also includes: The material of the heat-conducting support body (231) is an iron alloy or a copper alloy.

6. The battery safety testing device according to claim 1, characterized in that: The outer dimensions of the housing (100) are the same as those of the battery to be tested.

7. A battery thermal management performance testing system, characterized in that: include: A battery safety testing device (10) as claimed in any one of claims 1 to 6; A thermal management device (30) for thermally managing the first test battery (210), the second test battery (220), and the heating device (230); The control device (300) is also used to control the heating device (230) to operate so as to simulate the thermal behavior of the battery to be tested.

8. A battery thermal runaway diffusion test system, characterized in that: include: A battery safety testing device (10) as claimed in any one of claims 1 to 6; A diffusion battery cell (50) is clamped in the clamping device (40) and is arranged in close contact with the housing (100); A second temperature collection device (60) is arranged on the diffusion battery cell (50); The control device (300) is also used to control the operation of the heating device (230) according to the temperature data collected by the first temperature collection device (400) to simulate the thermal runaway behavior of the battery to be tested.

9. A method for performing battery safety testing using the battery thermal management performance testing system as claimed in claim 7, characterized in that: include: The control device (300) controls the heating device (230) to operate so as to heat the first test battery (210) and the second test battery (220); Collecting the temperature of the first test battery (210) and / or the second test battery (220) by the first temperature collecting device (400) to obtain temperature data; The control device (300) controls the heating device (230) to operate according to the temperature data, so as to simulate the thermal behavior of the battery to be tested; The change in the thermal behavior of the battery to be tested under the action of the thermal management device (30) is monitored to determine the performance of the thermal management device (30).

10. The battery safety testing method according to claim 9, characterized in that: The thermal behavior of the battery to be tested includes at least one of normal charging thermal behavior, normal discharging thermal behavior, overcharging thermal behavior and over-discharging thermal behavior.

11. A battery safety testing method using the battery thermal runaway diffusion testing system as claimed in claim 8, characterized in that: include: The control device (300) controls the heating device (230) to operate so as to heat the first test battery (210) and the second test battery (220); Collecting the temperature of the first test battery (210) and / or the second test battery (220) by the first temperature collecting device (400) to obtain temperature data; The control device (300) controls the heating device (230) to operate according to the temperature data, so as to simulate the thermal runaway behavior of the battery to be tested; The temperature of the diffusion battery cell (50) is collected by the second temperature collection device (60) to analyze the thermal runaway diffusion process of the diffusion battery cell (50).

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