Battery thermal runaway simulation device and battery simulation system

Abstract

The utility model provides a battery thermal runaway simulation device and a battery simulation system. The battery thermal failure simulation device comprises a shell, a battery cell assembly, a heating device, a first temperature sensor, a second temperature sensor and a recorder, a cover plate is arranged at one end of the shell, and positive and negative pole columns are arranged on the cover plate; the battery cell assembly is arranged in the accommodating space, and positive and negative tabs are arranged at one end, facing the opening of the shell, of the battery cell assembly to be connected with the positive and negative pole columns respectively; a plurality of heating areas are arranged on the battery core assembly; the heating device is detachably arranged in at least one heating area; the first temperature sensor is used for detecting the temperature of the heating area; the second temperature sensor is arranged on the positive pole lug and / or the negative pole lug and / or the positive pole column and / or the negative pole column and / or the shell; and the recorder is electrically connected with the first temperature sensor and the second temperature sensor so as to judge the occurrence of thermal runaway according to the first temperature sensor and the collected data and record the collected data of the second temperature sensor.

Description

Technical Field

[0001] The present disclosure relates to the field of battery management technology, and in particular to a battery thermal runaway simulation device and a battery simulation system. Background Art

[0002] With the vigorous promotion of national policies and the gradual increase in market share of new energy vehicles, the safety of power batteries, as core components of new energy vehicles, has become a focus of consumer attention. Under various extreme operating conditions of power batteries, such as overcharging, over-discharging, and overheating, thermal runaway may occur, posing a serious threat to the safety of drivers and passengers. The severity and severity of thermal runaway increase exponentially with the number of cells that trigger it, making research on thermal runaway in battery cells of great significance.

[0003] At present, the main reason for thermal runaway in battery cells is that the heat inside the battery cells accumulates to a certain threshold, causing the battery cells to fail. The existing testing method simulates triggering through needle puncture or external heating.

[0004] However, acupuncture or external heating are both simulation operations outside the battery cell, and cannot directly and accurately obtain the internal changes when the battery cell triggers thermal runaway. Utility Model Content

[0005] A technical problem to be solved by the present disclosure is that the existing battery thermal runaway simulation method cannot accurately obtain the internal changes of the battery cell when thermal runaway is triggered.

[0006] To solve the above technical problems, the present disclosure provides a battery thermal runaway simulation device, which includes:

[0007] The shell has a cover plate at one end to close the housing space of the shell, and the cover plate is provided with a positive electrode post and a negative electrode post;

[0008] The battery cell assembly is arranged in the accommodating space, and the end of the battery cell assembly facing the opening of the shell is provided with a positive electrode tab and a negative electrode tab to connect to the positive electrode post and the negative electrode post respectively; the battery cell assembly is provided with a plurality of heating areas;

[0009] A heating device, the heating device being detachably disposed in at least one heating area;

[0010] a first temperature sensor, the first temperature sensor being arranged corresponding to the heating device to detect the temperature of the heating area;

[0011] A second temperature sensor is provided on the positive electrode tab and / or the negative electrode tab and / or the positive electrode column and / or the negative electrode column and / or the housing;

[0012] The recorder is electrically connected to the first temperature sensor and the second temperature sensor to determine the occurrence of thermal runaway based on the first temperature sensor and collected data and record the collected data of the second temperature sensor when thermal runaway occurs.

[0013] In some embodiments, the aforementioned battery thermal runaway simulation device further includes a voltage acquisition line, the two ends of which are respectively connected to the positive electrode post and the negative electrode post, and the voltage acquisition line is electrically connected to the recorder to form a loop between the positive electrode post, the recorder and the negative electrode post.

[0014] In some embodiments, the battery thermal runaway simulation device described above, wherein the battery cell assembly includes a first battery cell pole coil and a second battery cell pole coil, and the first battery cell pole coil and the second battery cell pole coil are arranged side by side and in close contact along the thickness direction thereof;

[0015] The heating area is arranged on a side of the first battery cell pole coil facing the second battery cell pole coil.

[0016] In some embodiments, in the aforementioned battery thermal runaway simulation device, at least two of the following positions, namely, the center position of the first battery cell pole coil, the position on the first battery cell pole coil that is opposite to the positive electrode tab along its height direction and is closest to and farthest from the positive electrode tab, and the position on the first battery cell pole coil that is opposite to the negative electrode tab along its height direction and is closest to and farthest from the negative electrode tab, are heating areas.

[0017] In some embodiments, the battery thermal runaway simulation device described above, wherein the cover plate is provided with a terminal, the terminal passing through the cover plate and penetrating into the accommodation space, and the terminal is located at one end outside the cover plate for electrically connecting to a power supply device;

[0018] The heating device is electrically connected to the terminal at one end of the accommodating space.

[0019] In some embodiments, the battery thermal runaway simulation device described above, wherein the terminal is hollow inside and has openings at both ends;

[0020] The wiring of the first temperature sensor and the wiring of the second temperature sensor are connected to the recorder through the opening of the terminal;

[0021] The wiring of the first temperature sensor is sealed to the inner wall of the terminal.

[0022] In some embodiments, in the aforementioned battery thermal runaway simulation device, an insulating sleeve is provided on one end of the terminal located outside the cover.

[0023] In some embodiments, the aforementioned battery thermal runaway simulation device, wherein the cover plate is provided with a first through hole;

[0024] The connecting wires of the heating device, the first temperature sensor and the second temperature sensor all pass through the first through hole to connect to the power supply equipment and the recorder respectively, and the connecting wires of the heating device and the first temperature sensor are sealed to the inner wall of the first through hole.

[0025] In some embodiments, in the aforementioned battery thermal runaway simulation device, when the temperature rise rate of the measured heating area exceeds a specified rate and is maintained for a specified time, the temperature of the measured heating area reaches a specified temperature, or the voltage collected by the voltage collection line drops to a specified voltage, the recorder determines that thermal runaway has occurred;

[0026] The cover is provided with a liquid injection hole and an explosion-proof valve;

[0027] The first temperature sensor is spaced a specified distance from the heating device;

[0028] The coverage size of the heating device on the heating area along the height direction of the battery cell assembly is less than 1 / 4 of the height direction size of the battery cell assembly, and the coverage size of the heating device on the heating area along the length direction of the battery cell assembly is less than 1 / 4 of the length direction size of the battery cell assembly.

[0029] A second embodiment of the present application provides a battery simulation system, which includes at least one of the aforementioned battery thermal runaway simulation devices.

[0030] Through the above technical solution, the battery thermal runaway simulation device provided by the present disclosure sets a heating area on the battery cell assembly so that it can simulate the occurrence of thermal runaway by directly heating the battery inside, eliminating unnecessary structural heat transfer processes. Not only is the heating process efficient, but the timing of thermal runaway judgment is also accurate. The setting of multiple heating areas can also effectively simulate the impact of heating at different positions of the battery cell on thermal runaway, improving the comprehensive simulation of thermal runaway. At the same time, the setting of the second temperature sensor can also compare the temperature changes at other positions of the battery when the battery thermal runaway occurs, providing an accurate and reliable basis for the battery management system. This effectively solves the problem that existing battery thermal runaway simulation methods cannot accurately obtain the internal changes of the battery cell when thermal runaway is triggered. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 Schematic diagram of the structure of the battery thermal failure simulation device disclosed in the embodiment of the present disclosure;

[0033] Figure 2 Schematic diagram of the explosion structure of the battery structure in the battery thermal failure simulation device disclosed in an embodiment of the present disclosure;

[0034] Figure 3 Schematic diagram of the distribution of heating areas in the battery thermal failure simulation device disclosed in an embodiment of the present disclosure;

[0035] Figure 4 Schematic diagram of the structure of the cover plate in the battery thermal failure simulation device disclosed in an embodiment of the present disclosure;

[0036] Figure 5 is a cross-sectional schematic diagram of a cover plate in the battery thermal failure simulation device disclosed in an embodiment of the present disclosure;

[0037] Figure 6 This is a structural schematic diagram of a cover plate in the battery thermal failure simulation device disclosed in an embodiment of the present disclosure.

[0038] Description of reference numerals:

[0039] 1. Shell; 2. Battery cell assembly; 21. Positive electrode tab; 22. Negative electrode tab; 23. Heating area; 24. Connecting piece; 25. First battery cell pole roll; 26. Second battery cell pole roll; 3. Heating device; 4. First temperature sensor; 5. Second temperature sensor; 6. Recorder; 7. Cover; 71. Positive electrode post; 72. Negative electrode post; 73. Liquid injection hole; 74. Explosion-proof valve; 75. Terminal; 76. Insulating sleeve; 77. First through hole; 8. Power supply equipment; 9. Voltage acquisition line. DETAILED DESCRIPTION

[0040] The following embodiments of the present disclosure are further described in detail with reference to the accompanying drawings and examples. The detailed description of the following examples and the accompanying drawings are intended to illustrate the principles of the present disclosure, but are not intended to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but rather includes all technical solutions within the scope of the claims.

[0041] The present disclosure provides these embodiments in order to make this disclosure thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values ​​set forth in these embodiments should be interpreted as merely exemplary, and not as limiting.

[0042] It should be noted that, in the description of this disclosure, unless otherwise specified, "plurality" means greater than or equal to two; terms such as "upper," "lower," "left," "right," "inner," and "outer" indicating directions or positional relationships are intended solely to facilitate and simplify the description of this disclosure, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0043] In addition, the terms "first," "second," and similar terms used in this disclosure do not denote any order, quantity, or importance, but are merely used to distinguish different parts. "Perpendicular" does not mean perpendicular in the strict sense, but rather means within the tolerance range. "Parallel" does not mean parallel in the strict sense, but rather means within the tolerance range. "Include" or "comprising" and similar terms mean that the elements preceding the term include the elements listed after the term, and do not exclude the possibility of also including other elements.

[0044] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this disclosure depending on the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intervening device between the specific device and the first or second device.

[0045] All terms used in this disclosure have the same meaning as understood by one of ordinary skill in the art to which this disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in, for example, common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or highly formal sense, unless explicitly defined as such herein.

[0046] Currently, the primary cause of thermal runaway in battery cells is failure when internal heat builds up to a certain threshold. Existing testing methods simulate this triggering through needle penetration or external heating. For example, external heating is affected by the heat transfer rate of structures like the battery housing, resulting in low test efficiency. Furthermore, when the external heating temperature reaches the thermal runaway threshold, the internal battery temperature may not meet the standard, compromising accuracy. Furthermore, the temperature changes within the battery during thermal runaway are unknown, making it impossible to provide efficient and accurate guidance for battery management.

[0047] The battery thermal runaway simulation device provided in this embodiment utilizes a heating device installed in the heating area of ​​the battery cell assembly to achieve internal heating within the battery. This not only improves heating efficiency but also, in conjunction with an internal first temperature sensor and voltage acquisition line, allows timely and accurate detection of temperature changes at different locations within the battery during thermal runaway. It can also compare temperature changes at other locations when heating at different locations causes thermal runaway. This effectively addresses the problem that existing battery thermal runaway simulation methods cannot accurately detect internal changes in a battery cell when thermal runaway is triggered.

[0048] Example 1

[0049] Reference Attachment Figure 1 and attached Figure 2 The present embodiment discloses a battery thermal runaway simulation device, which includes a housing 1, a battery cell assembly 2, a heating device 3, a first temperature sensor 4, a second temperature sensor 5, and a recorder 6. A cover plate 7 is provided at one end of the housing 1 to close the accommodation space of the housing 1. The cover plate 7 is provided with a positive electrode post 71 and a negative electrode post 72; the battery cell assembly 2 is arranged in the accommodation space, and a positive electrode tab 21 and a negative electrode tab 22 are provided at one end of the battery cell assembly 2 facing the opening of the housing 1 to connect the positive electrode post 71 and the negative electrode post 72 respectively; the battery cell assembly 2 is provided with a plurality of heating elements. Hot area 23; the heating device 3 is detachably arranged in at least one heating area 23; the first temperature sensor 4 is arranged corresponding to the heating device 3 to detect the temperature of the heating area 23; the second temperature sensor 5 is arranged on the positive electrode tab 21 and / or the negative electrode tab 22 and / or the positive electrode pole 71 and / or the negative electrode pole 72 and / or the shell 1; the recorder 6 is electrically connected to the first temperature sensor 4 and the second temperature sensor 5 to determine the occurrence of thermal runaway based on the first temperature sensor 4 and the collected data and record the collected data of the second temperature sensor when thermal runaway occurs.

[0050] Specifically, in order to solve the problem that the existing battery thermal runaway simulation method cannot accurately obtain the internal changes of the battery cell when thermal runaway is triggered, the present embodiment provides a battery thermal runaway simulation device, which improves the simulation efficiency and accuracy by setting a number of heating areas on the battery cell assembly, and cooperating with the heating device, the first temperature sensor and the recorder to perform internal heating and judgment of the battery thermal runaway; at the same time, the first temperature sensor and the second temperature sensor are used to record the temperature changes at different positions when the battery thermal runaway occurs, providing an accurate and reliable basis for battery management. The battery management system can adjust the management mode according to the simulation data of the battery thermal failure simulation device. For example: according to the temperature data of the positive electrode and the negative electrode when the battery thermally fails, only the electrode temperature can be obtained when performing other battery management to quickly judge the thermal failure critical point, and timely power-off protection, etc., to prevent the battery from thermal failure.

[0051] Among them, the shell 1 is a rigid structure, which has a storage space for accommodating the battery cell assembly 2, which serves as the outer shell of the battery in this embodiment. The shape of the shell 1 is not limited here, and can be designed according to the shape of conventional batteries on the market; the shell 1 can be open at one end to realize the placement and removal of the battery cell assembly 2, and the shell 1 can also be set to a flip-fitting form, that is, two symmetrical slots are fastened together. In this embodiment, the following content will take the form of an opening at one end of the shell 1 as an example for a detailed structural description. The opening at one end of the shell 1 is conducive to ensuring the integrity and sealing of the battery. Correspondingly, a cover plate 7 is provided in this embodiment. The cover plate 7 is a rigid plate structure. The cover plate 7 is adapted to the shape and size of the opening of the shell 1. After the assembly of the battery cell assembly 2 is completed, the cover plate 7 and the shell 1 are sealed and connected when performing a thermal runaway simulation. It can be, but is not limited to, bonding, welding, etc., to ensure the sealing of the internal storage space of the shell 1 to avoid affecting the heat loss during the thermal runaway simulation. The cover plate 7 is provided with a positive electrode post 71 and a negative electrode post 72 spaced apart from each other. Both the positive electrode post 71 and the negative electrode post 72 penetrate the cover plate 7 to reserve a portion for electrically connecting the electrode ear inside the accommodating space and a portion for electrically connecting to the power supply or electrical equipment outside the accommodating space; the cover plate 7 is also provided with a liquid injection hole 73 to enable the operation of injecting electrolyte into the interior of the shell 1 to complete the battery structure; the cover plate 7 is also provided with an explosion-proof valve 74, that is, a waterproof and breathable valve to prevent the gas generated inside the shell 1 from expanding and damaging the shell 1 or the overall structure of the battery or self-exploding; the above settings can be easily understood by those skilled in the art.

[0052] The cell assembly 2 includes at least two cells, each of which is a single electrochemical cell formed by winding electrodes and containing a positive electrode tab 21 and a negative electrode tab 22. This is readily understood by those skilled in the art. This embodiment can be, but is not limited to, lithium-ion batteries. The number of cells included in the cell assembly 2 can be adjusted based on the actual simulated product design. Regardless of the number of cells, the positive electrode tabs 21 of all cells are electrically connected to the positive electrode post 71, and the negative electrode tabs 22 of all cells are electrically connected to the negative electrode post 72. The outer surface of the cell assembly 2 is provided with a plurality of heating areas 23. The heating areas 23 can be patch areas or point areas. The selection of heating areas 23 can be adjusted based on actual needs. In this embodiment, the heating areas 23 include at least a location corresponding to the center of the outer surface of the cell assembly 2. It is understood that when there is only one cell, the heating areas 23 can be located on either side of the outer surface of the cell. When there are two or more cells, the heating areas 23 can be located between adjacent cells so that the heat generated by the heating can be absorbed simultaneously by the adjacent cells. The number of heating zones 23 can be designed and adjusted based on actual needs. When performing thermal runaway simulation, it can be selected whether to heat some or all of the heating zones 23 based on actual simulation needs. It is also understood that in this embodiment, the tabs and posts can be connected via connecting tabs 24. That is, the housing 1, cover plate 7, and cell assembly 2 form a complete battery structure. During thermal failure simulation, the battery is fully charged but not operating (discharging or charging).

[0053] The heating device 3 is a structure generated by power supply, which can be, but not limited to, a heating sheet, a heating resistance wire, etc. The heating device 3 is attached to the heating area 23, which can be, but not limited to, pasted; the specific setting position of the heating device 3 can be adjusted according to the actual number of battery cells, and the setting method can correspond to the detailed description of the number of battery cells. Of course, in this embodiment, a power supply device 8 can also be set corresponding to the heating device 3, refer to the attached Figure 1 The power supply device 8 can be a generator, an external battery, etc. The power supply device is arranged outside the shell 1 and electrically connected to the heating device 3 to supply power thereto.

[0054] The first temperature sensor 4 and the second temperature sensor 5 are both high-precision temperature sensors capable of operating under high-temperature conditions. The number of first temperature sensors 4 can be adjusted based on the number of heating zones 23 being tested. It is understood that during testing, each first temperature sensor 4 corresponds to each heating zone 23 being tested. The second temperature sensor 5 can be positioned on the tabs and / or posts and / or the housing 1 as needed to promptly and accurately detect temperature changes at these locations when thermal runaway occurs. It is understood that the tabs herein include both the positive tab 21 and the negative tab 22, and the posts include both the positive post 71 and the negative post 72. The location of the second temperature sensor 5 on the housing 1 can also be adjusted based on actual needs, for example, to correspond to the location of the first temperature sensor 4, to a location around a post, and so on. It is also understood that the location of the heating device 3 and the corresponding temperature sensor are determined during design and fabrication and cannot be changed after the battery structure is formed. However, different test locations require adjustments to the heating zones 23.

[0055] The recorder 6 can generate digital displays, curve displays, list displays, and the like by running, simulating, and comparing the collected data. In this embodiment, a paperless recorder can be used, but is not limited to, to perform real-time, high-precision calculations, simulations, and comparisons on temperature, voltage, and other data. For example, when the heating rate of the measured heating region 23 exceeds a specified rate (1°C / s) and remains constant for a specified duration (3s), and the temperature of the measured heating region 23 simultaneously reaches a specified temperature (the manufacturer's maximum operating temperature), the battery is determined to be in a thermal runaway state. In this embodiment, not only can the first temperature sensor 4 be used to detect and determine the occurrence of thermal runaway, but the second temperature sensor 5 can also be used to perform simultaneous temperature detection at other locations, clearly identifying temperature changes at various locations inside and outside the battery when the battery is in thermal runaway, providing an accurate and reliable basis for battery management.

[0056] As listed above, the battery thermal runaway simulation device provided by the present disclosure provides a heating area 23 on the battery cell assembly 2 to simulate the occurrence of thermal runaway by directly heating the battery interior, eliminating unnecessary structural heat transfer processes. This not only makes the heating process efficient but also accurately determines the timing of thermal runaway. The provision of multiple heating areas 23 can also effectively simulate the impact of heating at different locations on the battery cell on thermal runaway, improving the comprehensive simulation of thermal runaway. At the same time, the provision of a second temperature sensor 5 can also compare the temperature changes at other locations of the battery during thermal runaway, providing an accurate and reliable basis for the battery management system. This effectively solves the problem that existing battery thermal runaway simulation methods cannot accurately obtain the internal changes of the battery cell when thermal runaway is triggered.

[0057] The term "and / or" in this article is merely a description of the association relationship between associated objects, identifying three possible relationships. For example, A and / or B is specifically understood as: A and B can be included at the same time, A can exist alone, B can exist alone, and any of the above three situations can be met.

[0058] In some embodiments, refer to the attached Figure 1 The battery thermal failure simulation device provided in this embodiment further includes a voltage acquisition line 9, the two ends of which are respectively connected to the positive electrode post 71 and the negative electrode post 72, and the voltage acquisition line 9 is electrically connected to the recorder 6 to form a loop between the positive electrode post 71, the recorder 6 and the negative electrode post 72.

[0059] Specifically, to ensure accurate and timely determination of battery thermal failure, a voltage acquisition line 9 is provided in this embodiment. The voltage acquisition line 9 is a conductive copper wire, which can be two conductive copper wires connected to the positive electrode 71 and the negative electrode 72, respectively. The other ends of the two conductive copper wires are simultaneously connected to the recorder 6, forming a conductive loop to measure the voltage between the positive and negative electrodes. The ability of a paperless recorder to acquire voltage data is readily understood by those skilled in the art and will not be described in detail here. Furthermore, in this embodiment, when determining the occurrence of thermal failure, the process is based on the detection results of the first temperature sensor 4. The detection results of the first temperature sensor 4 and the voltage acquisition line 9 can also be combined. For example, when the heating area 23 under test has a temperature rise rate exceeding a specified rate (1°C / s) and maintained for a specified duration (3s), the voltage collected by the voltage acquisition line 9 drops to a specified voltage (less than 75% of the original voltage), and the recorder 6 determines that thermal runaway has occurred. This determination criterion is parallel to the aforementioned temperature determination criterion. If at least one of the two criteria is met, a thermal failure is determined to have occurred, thus avoiding the impact of a single determination criterion on the accuracy and timeliness of the determination.

[0060] In some embodiments, refer to the attached Figure 2 In the battery thermal runaway simulation device provided in this embodiment, the battery cell assembly 2 includes a first battery cell pole roll 25 and a second battery cell pole roll 26. The first battery cell pole roll 25 and the second battery cell pole roll 26 are arranged side by side and in close contact along the thickness direction thereof; the heating area 23 is arranged on the side of the first battery cell pole roll 25 facing the second battery cell pole roll 26.

[0061] Specifically, taking two battery cells, i.e., battery cell pole coils, as an example, to improve the accuracy of thermal failure simulation, in this embodiment, the heating region 23 is disposed between the first battery cell pole coil 25 and the second battery cell pole coil 26. However, the first battery cell pole coil 25 may be positioned on the side facing the second battery cell pole coil 26, or the second battery cell pole coil 26 may be positioned on the side facing the first battery cell pole coil 25. This allows the heating region 23 and the heating device 3 to be located between the two, ensuring that both battery cells can be heated simultaneously without heat loss through the housing 1, thereby improving the accuracy of thermal failure simulation. Of course, the arrangement of the first battery cell pole coil 25 side by side with the second battery cell pole coil 26 along its thickness direction and in close contact with it is readily understood by those skilled in the art.

[0062] Further, refer to the attached Figure 3 In some embodiments, in the battery thermal failure simulation device provided by this embodiment, at least two of the center position E of the first battery cell pole coil 25, the position A on the first battery cell pole coil 25 that is opposite to the positive electrode tab 21 and closest to the positive electrode tab 21 along the height direction thereof and the farthest position C, and the position B on the first battery cell pole coil 25 that is opposite to the negative electrode tab 22 and closest to the negative electrode tab 22 along the height direction thereof and the farthest position D are heating areas.

[0063] Specifically, in order to simulate the thermal failure of the battery from multiple angles, in this embodiment, at least five configurable heating areas 23 are set according to the heating law of the battery. The first one is the center position E. The center position E can be designed and adjusted depending on the shape of the battery cell coil, for example Figure 3The battery cell coil is generally rectangular, and the center position E is the intersection of the two diagonals. In this embodiment, the center position E must be equipped with a heating device 3 for thermal failure simulation. The second is position A on the first battery cell pole roll 25 that is opposite to the positive pole tab 21 and closest to the positive pole tab 21 along its height direction; the third is position C on the first battery cell pole roll 25 that is opposite to the positive pole tab 21 and farthest from the positive pole tab 21 along its height direction; the fourth is position B on the first battery cell pole roll 25 that is opposite to the negative pole tab 22 and closest to the negative pole tab 22 along its height direction; the fifth is position D on the first battery cell pole roll 25 that is opposite to the negative pole tab 22 and farthest from the negative pole tab 22 along its height direction; because the pole will heat up and the temperature will change during the charging and discharging process of the battery, and the corresponding position will inevitably also produce temperature changes during thermal failure, and in this embodiment, the heating area 23 is selected corresponding to the pole tab inside the shell 1, and the positions closest and farthest to the pole tab are selected on the same straight line for data comparison or simulation comparison. Accordingly, the position and number of heating areas 23 can be designed and adjusted according to actual needs, and are not limited to the five mentioned above. The number of heating areas 23 tested during each thermal failure simulation can also be adjusted, for example: measuring the condition when the center position is heated separately; setting the condition when the center position and the position closest to the tab are heated at the same time, etc.

[0064] Furthermore, in some embodiments, the battery thermal failure simulation device provided in this embodiment, in a specific implementation, in order to realize the wiring of the heating device 3, the first temperature sensor 4 and the second temperature sensor 5, this embodiment provides at least the following two configuration methods:

[0065] The first one, refer to the attached Figure 4 and attached Figure 5 The cover plate 7 is provided with a terminal 75, which passes through the cover plate 7 and enters the accommodation space. The end of the terminal 75 located outside the cover plate 7 is used to electrically connect to the power supply device 8; the heating device 3 is electrically connected to the end of the terminal 75 located in the accommodation space.

[0066] Specifically, to power the heating device 3, in this embodiment, a terminal 75 is provided on the cover plate 7. The terminal 75 may be made of, but is not limited to, copper. The terminal 75 is sealed to the cover plate 7. The wiring of the heating device 3 is connected to the terminal 75 inside the housing 1, which may be, but is not limited to, welding. Accordingly, the end of the terminal 75 located outside the cover plate 7 is connected to the power supply 8. This connection may be a non-detachable connection to simplify assembly. Furthermore, to allow the temperature sensor wiring to be externally connected to the recorder 6, in this embodiment, the terminal 75 may be configured as a hollow cylinder with two open ends. The temperature sensor wiring can then be led out of the housing 1 through the openings of the terminal 75 and connected to the recorder 6. Of course, this process requires a sealed connection between the wiring and the inner wall of the terminal 75, which may be filled and bonded with, but is not limited to, glue. In this configuration, only the temperature sensor wiring passes through the interior of the terminal 75, which effectively reduces the inner diameter of the terminal 75 and facilitates sealing. It is understood that the wiring of the heating device 3 can also pass through the openings of the terminal 75 to connect to the power supply 8.

[0067] Reference Attachment Figure 4 and attached Figure 5 In the battery thermal runaway simulation device provided in this embodiment, in a specific implementation, an insulating sleeve 76 is provided on one end of the terminal 75 located outside the cover plate 7 .

[0068] Specifically, in order to improve the operational safety of the overall simulation device, in this embodiment, an insulating sleeve 76 is sleeved on the end of the terminal 75 located outside the cover 7. The insulating sleeve 76 can be but is not limited to a rubber sleeve, a ceramic sleeve, etc.; of course, it can be understood that the sleeve size of the insulating sleeve 76 in the axial direction of the terminal 75 can be designed and adjusted according to actual connection needs, which will not be elaborated here.

[0069] The second one, refer to the attached Figure 6 A first through hole 77 is provided on the cover plate 7; the connecting wires of the heating device 3, the connecting wires of the first temperature sensor 4 and the connecting wires of the second temperature sensor 5 all pass through the first through hole 77 to be connected to the power supply device 8 and the recorder 6 respectively, and the connecting wires of the heating device 3 and the connecting wires of the first temperature sensor 4 are sealed with the inner wall of the first through hole 77.

[0070] Specifically, to simplify the structure of the simulation device, in this embodiment, a first through hole 77 can be directly provided on the cover plate 7. The connecting wires of the heating device 3, the connecting wires of the first temperature sensor 4, and the wiring of the second temperature sensor 5 are all routed and connected externally through the first through hole 77. Of course, during this process, the connecting wires of the heating device 3, the connecting wires of the first temperature sensor 4, and the second temperature sensor 5 need to be sealed to the inner wall of the first through hole 77. This can be achieved by, but is not limited to, sealing with glue. The glue here can be an insulating glue to improve safety. The size and dimensions of the first through hole 77 can be designed and adjusted according to actual needs and are not described in detail here.

[0071] Furthermore, in the battery thermal runaway simulation device provided in this embodiment, in a specific implementation, the first temperature sensor 4 is spaced a specified distance from the heating device 3; the coverage dimension of the heating device 3 along the height direction of the battery cell assembly 2 on the heating area 23 is less than 1 / 4 of the height dimension of the battery cell assembly 2, and the coverage dimension of the heating device 3 along the length direction of the battery cell assembly 2 on the heating area 23 is less than 1 / 4 of the length dimension of the battery cell assembly 2.

[0072] Specifically, in order to improve the accuracy of thermal failure simulation and detection, in this embodiment, the first temperature sensor 4 is set next to the heating device 3, with a specified distance between the two to ensure that the temperature of the heating area 23 is detected instead of the temperature of the heating device 3. The specified distance can be, but is not limited to, 2 mm. At the same time, the coverage area of ​​the heating device 3 and the heating area 23 is also limited to ensure that the heating position is a point position, thereby improving the accuracy of the simulation. Figure 2 Taking the first battery cell pole roll 25 as an example, its height direction is the up and down direction in the figure, and its length direction is from the lower left to the upper right in the figure. The dimensions in the height direction and the length direction can both represent the dimensions in the height direction and the length direction of the battery cell assembly 2; in this embodiment, the covering size of the heating device 3 is set to be smaller than 1 / 4 of the dimensions of the battery cell assembly 2 in the corresponding directions in both the height direction and the length direction. Looking at the aforementioned heating areas A and B, heating devices are set on A and B at the same time to ensure the above-mentioned size requirements, so that the heated position is closer to a point position rather than a surface position, thereby improving the detection accuracy; and correspondingly, respective first temperature sensors 4 are set in the height direction, and the two first temperature sensors 4 will not come into contact, and each detects the temperature of the upper and lower areas, does not affect or interfere with each other, thereby ensuring the installation and detection accuracy; the same is true in the length direction, which will not be elaborated here.

[0073] Example 2

[0074] This embodiment provides a battery simulation system, which includes at least one battery thermal runaway simulation device.

[0075] Specifically, the battery thermal runaway simulation device is the battery thermal runaway simulation device in Example 1. For its structure and working principle, please refer to the detailed description of Example 1 and will not be elaborated on here. It can provide a data basis for the battery management system. The battery management system can adjust the management mode according to the simulation data of the battery thermal failure simulation device. For example, based on the temperature data of the positive and negative poles when the battery thermal failure occurs, only the pole temperature can be obtained when performing other battery management to quickly determine the critical point of thermal failure, and timely power-off protection can be performed to prevent thermal failure of the battery. The battery simulation system can also include, but is not limited to, an overcharge simulation device, an over-discharge simulation device, etc.

[0076] Thus far, various embodiments of the present disclosure have been described in detail. To avoid obscuring the concept of the present disclosure, some details well known in the art have not been described. Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein.

[0077] Although some specific embodiments of the present disclosure have been described in detail through examples, those skilled in the art will understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present disclosure. Those skilled in the art will understand that the above embodiments may be modified or some technical features may be replaced with equivalents without departing from the scope and spirit of the present disclosure. In particular, as long as there are no structural conflicts, the various technical features mentioned in the various embodiments may be combined in any manner.

Claims

1. A battery thermal runaway simulation device, characterized in that: It includes: A housing (1), one end of the housing (1) is provided with a cover plate (7) to close the accommodating space of the housing (1), and the cover plate (7) is provided with a positive electrode column (71) and a negative electrode column (72); A battery cell assembly (2), the battery cell assembly (2) being arranged in the accommodation space, and the battery cell assembly (2) having a positive electrode tab (21) and a negative electrode tab (22) at one end facing the opening of the housing (1) for connecting to the positive electrode column (71) and the negative electrode column (72) respectively; and a plurality of heating areas (23) being provided on the battery cell assembly (2); A heating device (3), the heating device (3) being detachably disposed in at least one of the heating areas (23); a first temperature sensor (4), the first temperature sensor (4) being arranged corresponding to the heating device (3) to detect the temperature of the heating area (23); a second temperature sensor (5), the second temperature sensor (5) being arranged on the positive electrode tab (21) and / or the negative electrode tab (22) and / or the positive electrode post (71) and / or the negative electrode post (72) and / or the housing (1); A recorder (6) is electrically connected to the first temperature sensor (4) and the second temperature sensor (5) to determine the occurrence of thermal runaway based on the first temperature sensor (4) and collected data and to record the collected data of the second temperature sensor (5) when thermal runaway occurs.

2. The battery thermal runaway simulation device according to claim 1, characterized in that: It also includes a voltage collection line (9), the two ends of which are respectively connected to the positive pole (71) and the negative pole (72), and the voltage collection line (9) is electrically connected to the recorder (6) to form a loop between the positive pole (71), the recorder (6) and the negative pole (72).

3. The battery thermal runaway simulation device according to claim 1, characterized in that: The battery cell assembly (2) comprises a first battery cell pole coil (25) and a second battery cell pole coil (26), wherein the first battery cell pole coil (25) and the second battery cell pole coil (26) are arranged side by side and in close contact along the thickness direction thereof; The heating area (23) is arranged on a side of the first battery cell pole coil (25) facing the second battery cell pole coil (26).

4. The battery thermal runaway simulation device according to claim 3, characterized in that: At least two of the following positions are the center position of the first battery cell pole coil (25), the position on the first battery cell pole coil (25) that is opposite to the positive electrode tab (21) along its height direction and is closest to and farthest from the positive electrode tab (21), and the position on the first battery cell pole coil (25) that is opposite to the negative electrode tab (22) along its height direction and is closest to and farthest from the negative electrode tab (22) as the heating area (23).

5. The battery thermal runaway simulation device according to claim 1, characterized in that: The cover plate (7) is provided with a terminal post (75), which passes through the cover plate (7) and enters the accommodating space, and one end of the terminal post (75) located outside the cover plate (7) is used for electrically connecting to a power supply device (8); The heating device (3) is electrically connected to the terminal (75) located at one end of the accommodating space.

6. The battery thermal runaway simulation device according to claim 5, characterized in that: The interior of the terminal post (75) is hollow and both ends of the terminal post (75) are open; The wiring of the first temperature sensor (4) and the wiring of the second temperature sensor (5) are connected to the recorder (6) through the opening of the terminal (75); The connection of the first temperature sensor (4) and the inner wall of the terminal (75) are sealed.

7. The battery thermal runaway simulation device according to claim 5, characterized in that: An insulating sleeve (76) is provided on one end of the terminal (75) located outside the cover plate (7).

8. The battery thermal runaway simulation device according to claim 1, characterized in that: The cover plate (7) is provided with a first through hole (77); The connecting wires of the heating device (3), the connecting wires of the first temperature sensor (4), and the connecting wires of the second temperature sensor (5) all pass through the first through hole (77) to respectively connect to the power supply device (8) and the recorder (6), and the connecting wires of the heating device (3) and the connecting wires of the first temperature sensor (4) are sealed to the inner wall of the first through hole (77).

9. The battery thermal runaway simulation device according to claim 2, characterized in that: When the heating rate of the measured heating area (23) exceeds a specified rate and is maintained for a specified time, the temperature of the measured heating area (23) reaches a specified temperature or the voltage collected by the voltage collection line (9) drops to a specified voltage, the recorder (6) determines that thermal runaway has occurred; The cover plate (7) is provided with a liquid injection hole (73) and an explosion-proof valve (74); The first temperature sensor (4) is spaced a specified distance from the heating device (3); The covering dimension of the heating device (3) in the heating area (23) along the height direction of the battery cell assembly (2) is less than 1 / 4 of the height dimension of the battery cell assembly (2), and the covering dimension of the heating device (3) in the heating area (23) along the length direction of the battery cell assembly (2) is less than 1 / 4 of the length dimension of the battery cell assembly (2).

10. A battery simulation system, characterized in that: It includes: At least one battery thermal runaway simulation device according to any one of claims 1 to 9.

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