Battery testing device, battery testing method and battery production equipment

Abstract

The invention provides a battery testing device, a battery testing method and battery production equipment. The battery testing device comprises a cabinet body, an air feeder, a heating part and a cooling part, a containing cavity is formed in the cabinet body and used for containing single batteries, and an air inlet is formed in the cabinet body and communicated with the containing cavity. The air feeder communicates with the air inlet and is used for blowing air to the containing cavity. The heating part is connected to the air feeder and used for heating air blown out by the air feeder. The cooling part is connected to the air feeder and used for cooling air blown out by the air feeder. According to the invention, the battery testing efficiency can be effectively improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery testing device, a battery testing method, and battery production equipment. Background Technology

[0002] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] During battery production, batteries need to be tested to confirm their quality. Battery testing efficiency directly impacts overall production efficiency and economic benefits. Therefore, effectively improving battery testing efficiency is a continuous technical challenge in battery technology. Summary of the Invention

[0004] In view of the above problems, this application provides a battery testing device, a battery testing method, and a battery production equipment, which can effectively improve battery testing efficiency.

[0005] In a first aspect, embodiments of this application provide a battery testing device, which includes a cabinet, a blower, a heating element, and a cooling element. The cabinet has an internal cavity for accommodating individual battery cells, and an air inlet connected to the cavity. The blower is connected to the air inlet and blows air into the cavity. The heating element is connected to the blower and heats the air blown out by the blower. The cooling element is connected to the blower and cools the air blown out by the blower.

[0006] The air blown by the blower is heated by a heating element, allowing the hot air to fully and directly contact the surface of the battery cells, thus rapidly increasing their temperature. Conversely, the air blower is cooled by a cooling element, allowing the cold air to fully and directly contact the surface of the battery cells, thus rapidly decreasing their temperature. Furthermore, this blowing method has relatively low structural complexity and cost, enabling the simultaneous heating or cooling of multiple battery cells relatively easily. Therefore, this technical solution can significantly shorten the time required for self-discharge testing, thereby effectively improving battery testing efficiency.

[0007] In some embodiments of the first aspect, the battery testing apparatus further includes a detection component disposed within a cabinet, the detection component being used to detect the temperature of the surface of a single battery cell.

[0008] The above technical solution integrates a detection component for detecting the surface temperature of individual battery cells into the battery testing device, thereby improving the battery testing effect by monitoring the surface temperature of individual battery cells in real time during the testing process.

[0009] In some embodiments of the first aspect, the battery testing apparatus further includes a control component connected to the detection component, the heating component, and the cooling component, the control component being used to control the operating parameters of the heating component and the cooling component based on the detection information from the detection component.

[0010] The above technical solution, by introducing control components, can accurately and conveniently adjust the operating parameters of the heating and cooling components, which can significantly improve the battery testing effect and efficiency.

[0011] In some embodiments of the first aspect, the cabinet is further provided with an air outlet connected to the receiving cavity, and the battery testing device further includes an exhaust fan connected to the air outlet.

[0012] The above technical solution, by introducing a fan, can reduce the energy consumption during temperature switching inside the containment cavity during battery self-discharge testing, thereby helping to reduce battery testing costs.

[0013] In some embodiments of the first aspect, the cabinet includes a body and a first wall portion, the body having a cabinet opening along a first direction, and the first wall portion being pivotally connected to the body and used to cover the cabinet opening.

[0014] The above technical solution can reduce the impact of the external environment on battery testing, improve battery testing quality, and enhance the ease of use of battery testing equipment.

[0015] In some embodiments of the first aspect, the body includes a second wall portion along a second direction, the second wall portion having an air outlet communicating with a receiving cavity, the first direction intersecting the second direction. The battery testing device further includes an exhaust fan communicating with the air outlet.

[0016] The above technical solution, through the reasonable layout of the air outlet, can reduce the difficulty of setting up the exhaust fan, and help improve the ease of installation and reduce the difficulty of maintenance.

[0017] In some embodiments of the first aspect, the body further includes a third wall portion and a fourth wall portion opposite each other along a third direction, and the air inlet includes a first inlet and a second inlet, the first inlet being disposed on the third wall portion and the second inlet being disposed on the fourth wall portion, the first direction, the second direction and the third direction being perpendicular to each other.

[0018] The above technical solution can form a more uniform and comprehensive airflow circulation within the cavity, further shortening the heating and cooling time, thereby further improving the efficiency of battery testing.

[0019] In some embodiments of the first aspect, the battery testing apparatus further includes a support component and a pressurizing component, the support component being used to support a single battery cell, and the pressurizing component being disposed on the support component and used to press the single battery cell.

[0020] The above technical solution reduces the electrode spacing of battery cells by pressurizing them, accelerates the formation of micro-short circuits inside the battery cells, and thus further improves the efficiency and accuracy of battery testing.

[0021] In some embodiments of the first aspect, the pressurizing component includes a first pressurizing member and a second pressurizing member disposed opposite each other along a first direction, with a battery cell placed between the first pressurizing member and the second pressurizing member.

[0022] The pressurization component of the above technical solution has a simple structure, which helps to reduce the overall structural complexity and cost of the battery testing device.

[0023] In some embodiments of the first aspect, the bearing member has a cavity, the pressurizing member is disposed in the cavity, and the first pressurizing member and the second pressurizing member are respectively disposed on both sides of the cavity along the first direction.

[0024] The above technical solution, by introducing a cavity, can not only reduce the space occupied by the pressurizing component in the battery testing device, thereby improving the structural compactness, but also improve the stability of the pressurizing component.

[0025] In some embodiments of the first aspect, the supporting component includes a frame and a supporting plate, the frame having a first opening and a second opening at both ends along the second direction, a cavity communicating with the first opening and the second opening, the supporting plate being detachably connected to the frame and covering the first opening, the supporting plate being used to support a battery cell, a pressurizing component being connected to the frame, and the first direction and the second direction intersecting.

[0026] The above technical solution can improve the convenience of disassembling individual battery cells, thereby further improving battery testing efficiency.

[0027] In some embodiments of the first aspect, a recess is provided on the carrier plate, the recess being recessed relative to the side of the carrier plate facing the cavity, the recess being used for insertion with a battery cell.

[0028] The above technical solution can improve the stability of battery cells during the testing process, reduce the risk of battery cell shaking affecting the test, and effectively improve the accuracy of battery testing.

[0029] In some embodiments of the first aspect, the first pressure member includes a first main body and two first connecting parts, the two first connecting parts being respectively connected to the two ends of the first main body along a third direction, the first main body protruding toward the second pressure member, the first connecting parts being connected to the frame, and the first direction, the second direction and the third direction being perpendicular to each other.

[0030] On the one hand, by setting the first main body and the first connecting part, the assembly difficulty between the first pressure member and the frame can be reduced; on the other hand, by setting the first main body to protrude toward the second pressure member, the distance between the first main body and the second pressure member can be reduced, thereby providing greater extrusion force to the battery cell and improving the pressure effect of the pressure member on the battery cell.

[0031] In some embodiments of the first aspect, the cavity has first grooves on the opposite sides of the cavity walls along the third direction, and two first connecting parts are respectively inserted into the first grooves of the cavity walls.

[0032] The second pressure component is installed on the frame via a plug-in connection, which is convenient and quick, improving the overall assembly efficiency of the battery testing device. Furthermore, the second groove restricts the movement of the second pressure component, thereby improving its stability and ultimately enhancing the reliability of the battery testing device.

[0033] In some embodiments of the first aspect, at least a portion of the first pressure member protrudes toward the second pressure member; and / or, at least a portion of the second pressure member protrudes toward the first pressure member.

[0034] It can reduce the distance between the first main body and the second pressure member, thereby providing greater extrusion force to the battery cell and improving the pressure effect of the pressure member on the battery cell.

[0035] In some embodiments of the first aspect, at least one of the first and second pressurizing members is an elastomer.

[0036] The above technical solution applies pressure to individual battery cells using elasticity, has a simple structure, high reliability, and can effectively reduce the overall cost of battery testing equipment.

[0037] In some embodiments of the first aspect, at least one of the first pressurizing member and the second pressurizing member is a sheet-like structure.

[0038] The sheet-like structure has a relatively small volume and occupies less space, which reduces the difficulty of assembling the pressurizing components and the load-bearing components.

[0039] In some embodiments of the first aspect, a first fin is provided on the side of the first pressurizing member facing away from the second pressurizing member; and / or, a second fin is provided on the side of the second pressurizing member facing away from the first pressurizing member.

[0040] This increases the overall surface area of ​​the pressurizing component, thereby effectively improving the heat conduction of the pressurizing component and further improving battery testing efficiency.

[0041] In some embodiments of the first aspect, a first buffer is provided on the side of the first pressure member near the second pressure member, the hardness of the first buffer being less than the hardness of the first pressure member; and / or, a second buffer is provided on the side of the second pressure member near the first pressure member, the hardness of the second buffer being less than the hardness of the second pressure member.

[0042] The above technical solution can reduce the risk of scratching individual battery cells during battery testing.

[0043] In some embodiments of the first aspect, the pressurizing component is detachably connected to the supporting component. This facilitates the replacement and adjustment of the pressurizing component, improving the overall ease of use of the battery testing device.

[0044] In some embodiments of the first aspect, there are multiple pressurizing components, which are spaced apart from the bearing component.

[0045] The above technical solution improves battery testing efficiency by setting up multiple pressurizing components to simultaneously pressurize multiple battery cells.

[0046] Secondly, this application provides a battery testing method, including:

[0047] The individual battery cells are placed in the cabinet's receiving cavity;

[0048] The heating element is controlled to heat the air blown out by the blower, so that the air at the first preset temperature is blown into the receiving cavity;

[0049] When the battery cell has been left to stand in the air at a first preset temperature for a first preset time, the cooling component is controlled to cool the air blown out by the blower so that the air at a second preset temperature is blown into the receiving cavity.

[0050] The battery cells are placed in a wind at a second preset temperature and the change in voltage of the battery cells over time is measured.

[0051] Based on the magnitude of the voltage change over time, test results for individual battery cells are generated, including whether the self-discharge is abnormal or normal.

[0052] The air blown by the blower is heated by a heating element, allowing the hot air to fully and directly contact the surface of the battery cells, thus rapidly increasing their temperature. Conversely, the air blower is cooled by a cooling element, allowing the cold air to fully and directly contact the surface of the battery cells, thus rapidly decreasing their temperature. Furthermore, this blowing method has relatively low structural complexity and cost, enabling the simultaneous heating or cooling of multiple battery cells relatively easily. Therefore, this technical solution can significantly shorten the time required for self-discharge testing, thereby effectively improving battery testing efficiency.

[0053] In some embodiments of the second aspect, the step of placing a battery cell in an air source at a second preset temperature and obtaining the change in voltage of the battery cell over time includes:

[0054] The battery cell is placed in the wind at a second preset temperature for a second preset time, and the voltage of the battery cell is obtained at a first moment to obtain a first voltage value.

[0055] Continue to let the battery cell stand still in the wind at the second preset temperature for a third preset time, and obtain the voltage of the battery cell at the second moment to obtain the second voltage value;

[0056] Calculate the ratio of the difference between the first and second voltage values ​​to the difference between the first and second time points to obtain the change in voltage over time.

[0057] The above technical solution involves first placing the battery cells in a cool, dry place at a second preset temperature for a period of time to allow the various properties of the battery cells to stabilize before measuring the voltage of the battery cells. This reduces testing errors and helps to further improve the accuracy of battery testing.

[0058] In some embodiments of the second aspect, when the battery cell has been left to stand in the air at a first preset temperature for a first preset time, the step of controlling the cooling component to cool the air blown out by the blower so that air at a second preset temperature is blown into the receiving cavity further includes:

[0059] When the battery cell has been left to stand in the wind at the first preset temperature for a first preset time, the heating element and the blower shall be stopped.

[0060] Control the exhaust fan to extract the hot air from the containment cavity;

[0061] The cooling components are controlled to cool the air blown out by the blower, so that air at a second preset temperature is blown into the receiving cavity.

[0062] The above technical solution can reduce the energy consumption during temperature switching inside the containment cavity during battery self-discharge testing, thereby helping to reduce battery testing costs.

[0063] Thirdly, this application provides a battery production apparatus, which includes the battery testing device provided in any embodiment of the first aspect.

[0064] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0065] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0066] Figure 1 This is a three-dimensional structural schematic diagram of a battery testing device provided in some embodiments of this application;

[0067] Figure 2 A three-dimensional structural diagram of a cabinet for a battery testing device provided in some embodiments of this application;

[0068] Figure 3 This is a top view schematic diagram of the cooperation between the support component and the pressurizing component of a battery testing device provided in some embodiments of this application;

[0069] Figure 4 for Figure 3 Schematic diagram of the cross-sectional structure along AA;

[0070] Figure 5 A top view of the supporting structure of a battery testing device provided in some embodiments of this application;

[0071] Figure 6 A top view of the pressurization component of a battery testing device provided in some embodiments of this application;

[0072] Figure 7 This is a top view schematic diagram of the structure of a battery testing device provided in some embodiments of this application, showing the cooperation between the supporting component, the pressurizing component, and the battery cell;

[0073] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure along BB;

[0074] Figure 9 This is a process flow diagram of a battery testing method provided in some embodiments of this application.

[0075] The reference numerals in the detailed embodiments are as follows:

[0076] 100. Battery cell;

[0077] 10. Cabinet; 11. Receiving cavity; 12. Air inlet; 121. First inlet; 122. Second inlet; 13. Main body; 131. Second wall section; 132. Third wall section; 133. Fourth wall section; 14. First wall section; 15. Air outlet;

[0078] 20. Blower; 30. Heating component; 40. Cooling component; 50. Detection component; 60. Control component;

[0079] 70. Supporting component; 71. Cavity; 72. Frame; 73. Supporting plate; 731. Recess; 74. First groove;

[0080] 80. Pressurizing component; 81. First pressurizing element; 811. First main body; 812. First connecting part; 82. Second pressurizing element; 83. First fin; 84. Second fin; 85. First buffer; 86. Second buffer;

[0081] 90. Exhaust fan;

[0082] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0083] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0084] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0085] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0086] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0087] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0088] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0089] In this application, "multiple" means two or more (including two).

[0090] In this application, the term "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering.

[0091] In this embodiment of the application, the battery cell can be a secondary battery cell, which refers to a battery cell that can be used again after being discharged by recharging to activate the active materials.

[0092] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-metal hydride battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., but the embodiments of this application are not limited to this.

[0093] With the development of new energy technologies, batteries are being used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0094] During the battery production process, batteries need to be tested to confirm whether their quality is up to standard. The efficiency of battery testing directly affects the overall production efficiency and economic benefits of batteries.

[0095] For example, the consistency of battery self-discharge is an important part of battery performance. Batteries with inconsistent self-discharge will show significant differences in remaining capacity after storage and use over a period of time. When this exceeds the balancing range of the battery management system, it will affect the reliability of the electrical device. Therefore, during the battery production process, batteries must undergo self-discharge testing to identify and remove substandard battery cells.

[0096] In related technologies, self-discharge testing typically involves subjecting individual battery cells to high-temperature aging in environments such as factories, workshops, or warehouses, followed by resting at room temperature. The purpose of high-temperature aging is to eliminate internal polarization within the battery cells and accelerate the dissolution and puncture of the separator by metal particles such as copper, iron, and stainless steel, forming internal physical pathways. The subsequent resting at room temperature aims to lower the battery cell temperature to room temperature, reducing the impact of temperature on the test and stabilizing the voltage.

[0097] Meanwhile, high-temperature aging also helps to eliminate defective products. During the high-temperature aging process, the battery's self-discharge characteristics (such as self-discharge rate, internal resistance change, voltage stability, thermal stability, and capacity retention) gradually become apparent. By testing the batteries after high-temperature aging, batteries with high consistency in self-discharge characteristic parameters can be selected, while defective products with poor consistency in self-discharge characteristic parameters can be eliminated, thereby ensuring the quality and reliability of battery products.

[0098] However, this method results in excessively long self-discharge testing cycles and high overall equipment and setup costs. Furthermore, temperature significantly impacts battery self-discharge testing; a wider temperature control range leads to higher testing efficiency. Specifically, higher temperatures accelerate internal chemical reactions, shortening the time required to expose the battery's self-discharge characteristics; lower temperatures reduce the time needed for individual cells to cool from high to room temperature, minimizing waiting time. Therefore, a wider temperature control range allows for a higher upper temperature limit and a lower lower temperature limit within the battery testing equipment, helping to shorten testing time and improve efficiency. However, limitations imposed by the temperature control capabilities of factories, workshops, or warehouses mean that increasing the temperature control range will significantly increase testing costs.

[0099] Based on the above considerations, this application provides a battery testing device, which includes a cabinet, a blower, a heating element, and a cooling element. The cabinet has an internal cavity for accommodating individual battery cells, and an air inlet connected to the cavity. The blower is connected to the air inlet and blows air into the cavity. The heating element is connected to the blower and heats the air blown out by the blower. The cooling element is connected to the blower and cools the air blown out by the blower.

[0100] The air blown by the blower is heated by a heating element, allowing the hot air to fully and directly contact the surface of the battery cells, thus rapidly increasing their temperature. Conversely, the air blower is cooled by a cooling element, allowing the cold air to fully and directly contact the surface of the battery cells, thus rapidly decreasing their temperature. Furthermore, this blowing method has relatively low structural complexity and cost, enabling the simultaneous heating or cooling of multiple battery cells relatively easily. Therefore, this technical solution can significantly shorten the time required for self-discharge testing, thereby effectively improving battery testing efficiency.

[0101] The battery testing apparatus provided in the embodiments of this application will now be described in conjunction with the accompanying drawings. Figure 1 This is a three-dimensional structural diagram of a battery testing device provided in some embodiments of this application. Figure 2 This is a three-dimensional structural diagram of a cabinet for a battery testing device provided in some embodiments of this application.

[0102] like Figures 1 to 2 As shown in the figure, this application embodiment provides a battery testing device, which includes a cabinet 10, a blower 20, a heating element 30, and a cooling element 40. The cabinet 10 has an internal cavity 11 for accommodating individual battery cells 100. The cabinet 10 also has an air inlet 12 connected to the cavity 11. The blower 20 is connected to the air inlet 12 and blows air into the cavity 11. The heating element 30 is connected to the blower 20 and heats the air blown out by the blower 20. The cooling element 40 is connected to the blower 20 and cools the air blown out by the blower 20.

[0103] For example, the battery testing device in this application embodiment can be used for, but is not limited to, battery self-discharge testing, battery high and low temperature storage testing, or hot box testing, as long as it involves battery testing that requires temperature control. For clarity in describing the embodiments of this application, the following description uses battery self-discharge testing as an example.

[0104] The cabinet 10 may be made of, but is not limited to, metallic or non-metallic materials. For example, metallic materials may be copper, copper alloy, aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, or stainless steel, while non-metallic materials may be polyethylene, polypropylene, polyvinyl chloride, or wood.

[0105] The blower 20 can be directly connected to the air inlet 12, or it can be connected to the air inlet 12 through other components. As an example, the blower 20 is connected to the air inlet 12 through a duct.

[0106] The blower 20 can be a high-efficiency and energy-saving centrifugal fan or axial fan to provide a stable and strong airflow. In addition, the blower 20 can adjust the air volume and speed according to the battery testing needs, thereby meeting the testing requirements of the battery cells 100 under different operating conditions.

[0107] Optionally, the blower 20 can also be combined with an air volume sensor to enable real-time monitoring and automatic adjustment, so as to ensure that the appropriate air volume and speed can be provided at different test stages.

[0108] The heating element 30 can be an electric heating element, such as a heating wire or a positive temperature coefficient heater.

[0109] The heating element 30 can be located inside or outside the cabinet 10. In some examples, the heating element 30 is located outside the cabinet 10, which can reduce the impact on the testing of the battery cells 100.

[0110] In some examples, the heating element 30 may be disposed inside the blower 20 to heat the blower 20 so that the blower 20 can directly blow out hot air, which then enters the receiving cavity 11 through the air inlet 12.

[0111] In some examples, the heating element 30 may also be located between the blower 20 and the air inlet 12. The air blown out by the blower 20 is first heated by the heating element 30 to form hot air, and then enters the receiving cavity 11 through the air inlet 12.

[0112] The cooling component 40 can be an evaporative cooling device, a heat exchanger, or a refrigeration element (such as a semiconductor refrigeration chip).

[0113] The cooling component 40 can be located inside or outside the cabinet 10. In some examples, the cooling component 40 is located outside the cabinet 10, which can reduce the impact on the testing of the battery cell 100.

[0114] In some examples, the cooling component 40 may be located inside the blower 20 to cool the blower 20 so that the blower 20 can directly blow out cold air, which then enters the receiving cavity 11 through the air inlet 12.

[0115] In some examples, the cooling component 40 may also be located between the blower 20 and the air inlet 12. The air blown out by the blower 20 is first cooled by the cooling component 40 to form cold air, and then enters the receiving cavity 11 through the air inlet 12.

[0116] The heating element 30 heats the air blown by the blower 20, allowing the hot air to fully and directly contact the surface of the battery cell 100, thus rapidly increasing its temperature. Conversely, the cooling element 40 cools the air blown by the blower 20, allowing the cold air to fully and directly contact the surface of the battery cell 100, thus rapidly decreasing its temperature. Furthermore, the blowing method has relatively low structural complexity and cost, enabling relatively simple simultaneous heating or cooling of multiple battery cells 100. Therefore, this technical solution can significantly shorten the time required for self-discharge testing, thereby effectively improving battery testing efficiency.

[0117] In some embodiments, the battery testing apparatus further includes a detection component 50 disposed inside the cabinet 10, which is used to detect the temperature of the surface of the battery cell 100.

[0118] For example, the function of the detection component 50 is to detect the temperature change of the surface of the battery cell 100 in real time during the test. The detection component 50 may be, but is not limited to, a thermocouple, an infrared sensor, a fiber optic temperature sensor, or a thermal imager.

[0119] The detection component 50 can be detachably connected to the cabinet 10 or integrally mounted on the cabinet 10. The detection component 50 can be directly connected to the cabinet 10 or constrained to the cabinet 10 by other components. As an example, the connection method between the detection component 50 and the cabinet 10 can be, but is not limited to, bolt connection, welding, riveting, or snap-fit.

[0120] The above technical solution integrates a detection component 50 for detecting the surface temperature of the battery cell 100 into the battery testing device, thereby improving the battery testing effect by monitoring the surface temperature of the battery cell 100 in real time during the testing process.

[0121] Optionally, the detection component 50 is communicatively connected to the heating component 30 and the cooling component 40. The detection component 50 can adjust the operating parameters of the heating component 30 and the cooling component 40 in real time based on the temperature information of the surface of the battery cell 100 it acquires, so as to reduce manual intervention and improve battery testing efficiency and stability.

[0122] In some embodiments, the battery testing apparatus further includes a control component 60, which is connected to the detection component 50, the heating component 30, and the cooling component 40. The control component 60 is used to control the operating parameters of the heating component 30 and the cooling component 40 based on the detection information from the detection component 50.

[0123] For example, the control unit 60 has a highly integrated electronic control system that can automatically adjust the operating parameters of the heating unit 30 and the cooling unit 40 based on the temperature information detected by the detection unit 50. These parameters include, but are not limited to, temperature setting, heating / cooling time, heating / cooling power, and heating / cooling area. Through a communication connection with the heating unit 30 and the cooling unit 40, the control unit 60 can also receive feedback information from the heating unit 30 and the cooling unit 40 and make rapid adjustments based on preset programs or real-time monitoring data to ensure the stability and consistency of the heating / cooling process.

[0124] The control unit 60 can be a microprocessor or a programmable logic controller, in conjunction with professional control software, to achieve precise control of the heating / cooling process.

[0125] The control unit 60 can also employ a cloud-based electronic control system to enable remote monitoring and control, increasing operational flexibility and convenience.

[0126] The control unit 60 can also adopt an electronic control system with artificial intelligence algorithms, which can learn and adjust the working parameters according to the test data to achieve a more efficient and automated testing process.

[0127] The above technical solution, by introducing the control component 60, can accurately and conveniently adjust the working parameters of the heating component 30 and the cooling component 40, which can significantly improve the battery testing effect and efficiency.

[0128] In some embodiments, the cabinet 10 is further provided with an air outlet 15, which is connected to the receiving cavity 11. The battery testing device also includes an exhaust fan 90, which is connected to the air outlet 15.

[0129] For example, the function of the air outlet 15 is to allow airflow to be discharged from the receiving cavity 11 by connecting to the receiving cavity 11, thereby maintaining airflow inside the receiving cavity 11. The exhaust fan 90 is used to extract the gas inside the receiving cavity 11 to reduce energy consumption during temperature switching inside the receiving cavity 11.

[0130] Specifically, the heating element 30 heats the air blown out by the blower 20. After the hot air enters the housing cavity 11 and completes the heating of the battery cell 100, the hot air is first extracted from the housing cavity 11 by the exhaust fan 90, and then the air blown out by the blower 20 is cooled by the cooling element 40. The cold air then enters the housing cavity 11 to cool the battery cell 100. Furthermore, after the self-discharge test of the battery cell 100 is completed, the cold air in the housing cavity 11 can be extracted by the exhaust fan 90, and then the air blown out by the blower 20 can be heated by the heating element 30. The hot air then enters the housing cavity 11 to heat the battery cell 100, and the above process is repeated in a cycle.

[0131] The exhaust fan 90 can be directly connected to the air outlet 15, or it can be connected to the air outlet 15 through other components. As an example, the exhaust fan 90 is connected to the air outlet 15 through a duct.

[0132] The exhaust fan 90 can be a high-efficiency and energy-saving centrifugal fan or axial fan. In addition, the exhaust fan 90 can adjust the air volume and speed according to the battery testing needs, thereby meeting the testing requirements of the battery cells 100 under different operating conditions.

[0133] Optionally, the exhaust fan 90 can also be combined with an air volume sensor to achieve real-time monitoring and automatic adjustment.

[0134] For example, the single-operation time of the exhaust fan 90 can be 1 minute to 10 minutes. Specifically, after the exhaust fan 90 extracts hot air from the receiving cavity 11 for 1 minute to 10 minutes, the air blown out by the blower 20 can be cooled by the cooling component 40, so that the cold air enters the receiving cavity 11 to cool the battery cell 100. Alternatively, after the exhaust fan 90 extracts cold air from the receiving cavity 11 for 1 minute to 10 minutes, the air blown out by the blower 20 can be heated by the heating component 30, so that the hot air enters the receiving cavity 11 to heat the battery cell 100.

[0135] As an example, the single operating time of the exhaust fan 90 can be, but is not limited to, 1 minute, 2 minutes, 3 minutes, 4 minutes, 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, or 10 minutes. It should be noted that the single operating time of the exhaust fan 90 can be a time range; that is, in this example, the single operating time of the exhaust fan 90 can be within the range of 1 minute to 10 minutes. The specific time can be selected according to the actual application environment.

[0136] In some examples, the single-run time of the exhaust fan 90 can be 1 minute to 5 minutes.

[0137] The above technical solution, by introducing a fan 90, can reduce the energy consumption during temperature switching inside the containment cavity 11 during the self-discharge test of the battery cell 100, thereby helping to reduce battery testing costs.

[0138] In some embodiments, the cabinet 10 includes a body 13 and a first wall portion 14. The body 13 has a cabinet opening along a first direction X, and the first wall portion 14 is pivotally connected to the body 13 and is used to cover the cabinet opening.

[0139] For example, the first wall portion 14 is openable and closable. During battery testing, the first wall portion 14 closes to the cabinet opening to seal the receiving cavity 11 and reduce the impact of the external environment on the battery testing. When the battery testing is completed, the first wall portion 14 opens to facilitate the removal of the battery cell 100 from the cabinet 10.

[0140] In some examples, the first wall 14 and the cabinet 10 may be made of the same material to simplify the manufacturing process and reduce costs.

[0141] The above technical solution can reduce the impact of the external environment on battery testing, improve battery testing quality, and enhance the ease of use of battery testing equipment.

[0142] In some embodiments, the body 13 includes a second wall portion 131 along the second direction Y, and an air outlet 15 is formed on the second wall portion 131. The air outlet 15 is connected to the receiving cavity 11, and the first direction X intersects the second direction Y. The battery testing device also includes an exhaust fan 90, which is connected to the air outlet 15. By rationally arranging the air outlet 15, the difficulty of setting up the exhaust fan 90 can be reduced, which helps to improve the ease of installation and reduce the difficulty of maintenance of the exhaust fan 90.

[0143] In some examples, the first direction X is perpendicular to the second direction Y.

[0144] In some examples, the second direction Y is perpendicular to the horizontal plane.

[0145] In some embodiments, the body 13 further includes a third wall portion 132 and a fourth wall portion 133 opposite to each other along the third direction Z, and the air inlet 12 includes a first inlet 121 and a second inlet 122. The first inlet 121 is disposed on the third wall portion 132, and the second inlet 122 is disposed on the fourth wall portion 133. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0146] The first inlet 121 is located in the third wall portion 132, and the air intake fan is connected to the first inlet 121, blowing air into the receiving cavity 11 through the first inlet 121. The second inlet 122 is located in the fourth wall portion 133, and the air intake fan is also connected to the second inlet 122, blowing air into the receiving cavity 11 through the second inlet 122. The relative arrangement of the third wall portion 132 and the fourth wall portion 133 allows the airflow entering the receiving cavity 11 from the first inlet 121 and the second inlet 122 to form a countercurrent, allowing the airflow to diffuse more quickly throughout the receiving cavity 11, thus forming a more uniform and comprehensive airflow circulation.

[0147] In some examples, the first inlet 121 and the second inlet 122 are set relative to each other along a third direction Z.

[0148] The above technical solution can form a more uniform and comprehensive airflow circulation within the cavity 11, further shortening the heating and cooling time, thereby further improving the efficiency of battery testing.

[0149] Figure 3 This is a top view schematic diagram of the cooperation between the support component and the pressurizing component of a battery testing device provided in some embodiments of this application. Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure along AA. Figure 5 This is a top view schematic diagram of the supporting structure of a battery testing device provided in some embodiments of this application. Figure 6 This is a top view schematic diagram of the pressurization component of a battery testing device provided in some embodiments of this application. Figure 7 This is a top view schematic diagram of the cooperation between the support component, the pressurizing component, and the battery cell of a battery testing device provided in some embodiments of this application. Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure along BB.

[0150] Continue to refer to Figures 3 to 8 In some embodiments, the battery testing apparatus further includes a support member 70 and a pressurizing member 80. The support member 70 is used to support the battery cell 100, and the pressurizing member 80 is disposed on the support member 70 and used to compress the battery cell 100.

[0151] The support member 70 can be used to support multiple pressurizing members 80. For example, when it is necessary to pressurize a battery cell 100, the support member 70 can be used to support the battery cell 100. Of course, the support member 70 can directly support the battery cell 100, or it can indirectly support the battery cell 100 through other members (such as the pressurizing members 80). The support member 70 may include a tray, which can be a flat tray or a box-type tray.

[0152] Optionally, the load-bearing component 70 may be, but is not limited to, made of metallic or non-metallic materials. For example, metallic materials may be copper, copper alloys, aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, or stainless steel, while non-metallic materials may be polyethylene, polypropylene, polyvinyl chloride, or wood.

[0153] The pressurizing component 80 may be fixedly connected to the supporting component 70. Alternatively, the position of the pressurizing component 80 on the supporting component 70 may be adjustable along the first direction X. The pressurizing component 80 may be a single piece or may be composed of multiple independent components connected together.

[0154] The number of pressurizing components 80 can be one or more. When there are multiple pressurizing components 80, all the pressurizing components 80 of the battery testing apparatus can be arranged in one column or multiple columns. In some examples, all the pressurizing components 80 of the battery testing apparatus are arranged in one column along a first direction X. In other examples, the battery testing apparatus includes multiple pressurizing sequences, each pressurizing sequence including at least two pressurizing components 80 arranged along the first direction X, and the multiple pressurizing sequences are arranged along a third direction Z.

[0155] Multiple pressurizing components 80 can adopt the same structure or different structures, as long as the pressurizing components 80 can compress the battery cell 100.

[0156] The pressurizing component 80 can be detachably mounted on the bearing component 70 or integrally mounted on the bearing component 70. The pressurizing component 80 can be directly connected to the bearing component 70 or constrained to the bearing component 70 by other components.

[0157] The pressurizing component 80 can be mechanical or electric, selected according to the required pressure and control precision. In a mechanical pressurizing component 80, a screw clamping structure can be used, with the pressure applied to the battery cell 100 adjusted manually or electrically. In an electric pressurizing component 80, a servo motor or hydraulic system can be used, with pressure feedback control via a precise force sensor to ensure accurate and controllable pressure application.

[0158] The above technical solution reduces the electrode spacing of the battery cell 100 by pressurizing it, and accelerates the formation of micro-short circuits inside the battery cell 100, thereby further improving the efficiency and accuracy of battery testing.

[0159] In some embodiments, the pressurizing component 80 includes a first pressurizing member 81 and a second pressurizing member 82 disposed opposite to each other along a first direction X, with the first pressurizing member 81 and the second pressurizing member 82 used to place a battery cell 100.

[0160] For example, both the first pressure member 81 and the second pressure member 82 can be sheet-like structures, block-like structures, or column-like structures.

[0161] In some examples, both the first pressure member 81 and the second pressure member 82 are sheet-like structures.

[0162] In some examples, the first pressurizing element 81 and the second pressurizing element 82 are arranged symmetrically.

[0163] In some examples, the first pressurizing member 81 and the second pressurizing member 82 can pressurize the battery cell 100 by moving themselves. Specifically, both the first pressurizing member 81 and the second pressurizing member 82 can reciprocate along the first direction X. The first pressurizing member 81 and the second pressurizing member 82 move relative to each other along the first direction X to pressurize the battery cell 100, and the first pressurizing member 81 and the second pressurizing member 82 move in opposite directions along the first direction X to release pressure.

[0164] In some examples, the first pressurizing member 81 and the second pressurizing member 82 are elastomers, and the first pressurizing member 81 and the second pressurizing member 82 pressurize the battery cell 100 through their own elastic deformation.

[0165] The first pressure member 81 and the second pressure member 82 can be made of the same material or different materials. As an example, the first pressure member 81 and the second pressure member 82 have the same structure and material, which helps to simplify the manufacturing process and reduce costs.

[0166] The pressurization component 80 of the above technical solution has a simple structure, which helps to reduce the overall structural complexity and cost of the battery testing device.

[0167] In some embodiments, the bearing member 70 has a cavity 71, the pressurizing member 80 is disposed in the cavity 71, and the first pressurizing member 81 and the second pressurizing member 82 are respectively disposed on both sides of the cavity 71 along the first direction X.

[0168] For example, cavity 71 is used to accommodate pressurizing component 80 and battery cell 100. Pressurizing component 80 may be partially or entirely accommodated in cavity 71.

[0169] The number of cavities 71 can be one or more, and the number of cavities 71 corresponds to the number of pressurizing components 80. As an example, there are multiple cavities 71 and multiple pressurizing components 80, and multiple pressurizing components 80 and multiple cavities 71 are set in a one-to-one correspondence.

[0170] The above technical solution, by introducing cavity 71, can not only reduce the space occupied by pressurizing component 80 in the battery testing device to improve structural compactness, but also improve the stability of pressurizing component 80.

[0171] In some embodiments, the support member 70 includes a frame 72 and a support plate 73. The frame 72 has a first opening and a second opening at its two ends along the second direction Y, respectively. The cavity 71 connects the first opening and the second opening. The support plate 73 is detachably connected to the frame 72 and covers the first opening. The support plate 73 is used to support the battery cell 100. The pressurizing member 80 is connected to the frame 72. The first direction X and the second direction Y intersect.

[0172] For example, the support plate 73 can be directly connected to the frame 72, or it can be constrained to the frame 72 by other components. The frame 72 can be understood as the sidewall of the cavity 71, and the support plate is connected to one side of the frame 72 along the second direction Y, and together with the frame 72, defines the cavity 71. The support plate 73 covers the first opening, and the battery cell 100 is placed into the cavity 71 through the second opening.

[0173] The support plate 73 is detachably connected to the frame 72. After the battery cell 100 has completed the test, the support plate 73 can be removed from the frame 72 first, and then the battery cell 100 can be taken out from the cavity 71.

[0174] In some examples, there are multiple cavities 71, and multiple first openings and second openings. The number of first openings, second openings and cavities 71 correspond to the number of cavities 71, that is, cavities 71 are connected to a first opening and a second opening.

[0175] The above technical solution can improve the ease of disassembling the battery cell 100, thereby further improving the battery testing efficiency.

[0176] In some embodiments, a recess 731 is provided on the support plate 73, the recess 731 being recessed relative to the side of the support plate 73 facing the cavity 71, and the recess 731 is used for insertion with the battery cell 100.

[0177] For example, after the battery cell 100 is inserted into the recess 731, the recess 731 can restrict the movement of the battery cell 100 in a direction intersecting the second direction Y.

[0178] The above technical solution can improve the stability of the battery cell 100 during the test, reduce the risk of the battery cell 100 shaking and affecting the test, and effectively improve the accuracy of battery testing.

[0179] In some embodiments, the first pressure member 81 includes a first main body 811 and two first connecting parts 812. The two first connecting parts 812 are respectively connected to the two ends of the first main body 811 along the third direction Z. The first main body 811 protrudes toward the second pressure member 82. The first connecting parts 812 are connected to the frame 72. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0180] The first connecting part 812 can be detachably connected to the first main body part 811, or it can be integrally disposed on the first main body part 811. The first connecting part 812 can be directly connected to the first main body part 811, or it can be constrained to the first main body part 811 by other components. As an example, the connection method between the first connecting part 812 and the first main body part 811 can be, but is not limited to, bolt connection, welding, riveting, snap-fitting, or bonding.

[0181] In some examples, the first main body 811 and the first connecting part 812 are integrally formed. On the one hand, there is no need to connect the first main body 811 and the first connecting part 812 through an additional connecting process, simplifying the manufacturing process. At the same time, compared with connecting the first main body 811 and the first connecting part 812 through an additional connecting process, the integral structure of the first main body 811 and the first connecting part 812 has a higher connection strength.

[0182] For example, the first main body portion 811 refers to the main functional component of the first pressure member 81 for compressing the battery cell 100, and the first connecting portion 812 refers to the main functional component of the first pressure member 81 for connecting with the frame 72. The first main body portion 811 may partially protrude toward the second pressure member 82, or the first main body portion 811 may entirely protrude toward the second pressure member 82.

[0183] The first main body 811 and the first connecting part 812 can be made of the same material or different materials. As an example, making the first main body 811 and the first connecting part 812 of the same material helps to simplify the manufacturing process and reduce costs.

[0184] On the one hand, by setting the first main body 811 and the first connecting part 812, the assembly difficulty between the first pressure member 81 and the frame 72 can be reduced; on the other hand, by setting the first main body 811 to protrude toward the second pressure member 82, the distance between the first main body 811 and the second pressure member 82 can be reduced, thereby providing greater extrusion force to the battery cell 100 and improving the pressure effect of the pressure member 80 on the battery cell 100.

[0185] In some embodiments, the cavity 71 has a first groove 74 on each of the two opposite sides of the cavity wall along the third direction Z, and two first connecting parts 812 are respectively inserted into the first groove 74 on the two sides of the cavity wall.

[0186] The first pressure-applying component 81 is installed on the frame 72 via a plug-in connection, which is convenient and quick, and can improve the overall assembly efficiency of the battery testing device. In addition, the first groove 74 can also restrict the movement of the first pressure-applying component 81, thereby helping to improve the stability of the first pressure-applying component 81 and thus improving the reliability of the battery testing device.

[0187] In some embodiments, the second pressure member 82 includes a second main body and two second connecting parts. The two second connecting parts are respectively connected to the two ends of the second main body along the third direction Z. The second main body protrudes toward the first pressure member 81. The second connecting parts are connected to the frame 72. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0188] The second connecting part can be detachably connected to the second main body or integrally formed on the second main body. The second connecting part can be directly connected to the second main body or constrained to the second main body by other components. As an example, the connection method between the second connecting part and the second main body can be, but is not limited to, bolting, welding, riveting, snap-fitting, or bonding.

[0189] In some examples, the second main body and the second connecting part are integrally molded. On the one hand, this eliminates the need for additional joining processes, simplifying the manufacturing process. On the other hand, compared to joining the second main body and the second connecting part through additional joining processes, the integral structure provides a stronger connection between the two parts.

[0190] For example, the second main body refers to the main functional component of the second pressure member 82 for compressing the battery cell 100, and the second connecting part refers to the main functional component of the second pressure member 82 for connecting with the frame 72. The second main body may partially protrude toward the first pressure member 81, or the second main body may protrude entirely toward the first pressure member 81.

[0191] The second main body and the second connecting part can be made of the same material or different materials. As an example, making the second main body and the second connecting part of the same material helps to simplify the manufacturing process and reduce costs.

[0192] On the one hand, by providing a second main body and a second connecting part, the assembly difficulty between the second pressure member 82 and the frame 72 can be reduced; on the other hand, by providing a second main body that protrudes toward the second pressure member 82, the distance between the second main body and the second pressure member 82 can be reduced, thereby providing greater extrusion force to the battery cell 100 and improving the pressure effect of the pressure member 80 on the battery cell 100.

[0193] In some embodiments, the cavity 71 has a second groove on each of its two opposing sides along the third direction Z, and two second connecting parts are respectively inserted into the second grooves on the two sides of the cavity wall.

[0194] The second pressure-applying component 82 is installed on the frame 72 via a plug-in connection, which is convenient and quick, and can improve the overall assembly efficiency of the battery testing device. In addition, the second groove can also restrict the movement of the second pressure-applying component 82, thereby helping to improve the stability of the second pressure-applying component 82 and thus improving the reliability of the battery testing device.

[0195] In some embodiments, at least a portion of the first pressure member 81 protrudes toward the second pressure member 82.

[0196] For example, the first pressure member 81 may protrude partially toward the second pressure member 82, or the first pressure member 81 may protrude entirely toward the second pressure member 82.

[0197] By setting at least a portion of the first pressure member 81 to protrude toward the second pressure member 82, the distance between the first main body 811 and the second pressure member 82 can be reduced, thereby providing greater extrusion force to the battery cell 100 and improving the pressure effect of the pressure member 80 on the battery cell 100.

[0198] In some embodiments, at least a portion of the second pressure member 82 protrudes toward the first pressure member 81.

[0199] For example, the second pressure member 82 may protrude partially toward the first pressure member 81, or the second pressure member 82 may protrude entirely toward the first pressure member 81.

[0200] By setting at least a portion of the second pressure member 82 to protrude toward the first pressure member 81, the distance between the second main body and the first pressure member 81 can be reduced, thereby providing greater extrusion force to the battery cell 100 and improving the pressure effect of the pressure member 80 on the battery cell 100.

[0201] In some embodiments, at least one of the first pressure member 81 and the second pressure member 82 is an elastomer.

[0202] For example, the first pressure member 81 may be an elastic body, the second pressure member 82 may be an elastic body, or both the first pressure member 81 and the second pressure member 82 may be elastic bodies.

[0203] The elastomer is easily deformable and can recover from deformation. When the battery cell 100 is placed between the first pressure member 81 and the second pressure member 82, the elastomer can deform quickly to transmit pressure to the battery cell 100.

[0204] The above technical solution applies pressure to the battery cell 100 through elasticity, has a simple structure, high reliability, and can effectively reduce the overall cost of the battery testing device.

[0205] In some embodiments, at least one of the first pressurizing member 81 and the second pressurizing member 82 is a sheet-like structure.

[0206] For example, the first pressure member 81 may be a sheet-like structure, the second pressure member 82 may be a sheet-like structure, or both the first pressure member 81 and the second pressure member 82 may be sheet-like structures.

[0207] The sheet-like structure has a relatively small volume and occupies less space, which reduces the assembly difficulty between the pressurizing component 80 and the load-bearing component 70.

[0208] In some embodiments, the first pressure member 81 and the second extrusion member are both elastic steel sheets.

[0209] In some embodiments, a first fin 83 is provided on the side of the first pressurizing member 81 facing away from the second pressurizing member 82.

[0210] Exemplarily, the first fin 83 protrudes from the surface of the first pressure member 81 on the side facing away from the second pressure member 82. The first fin 83 can be detachably connected to the first pressure member 81, or it can be integrally formed on the first pressure member 81. The first fin 83 can be directly connected to the first pressure member 81, or it can be constrained to the first pressure member 81 by other components. As an example, the connection method between the first fin 83 and the first pressure member 81 can be, but is not limited to, bolting, welding, riveting, snap-fitting, or bonding.

[0211] In some examples, the first pressure member 81 and the first fin 83 are integrally formed. On the one hand, there is no need to connect the first pressure member 81 and the first fin 83 through an additional connecting process, simplifying the manufacturing process. On the other hand, compared with connecting the first pressure member 81 and the first fin 83 through an additional connecting process, the integral structure of the first pressure member 81 and the first fin 83 has a higher connection strength.

[0212] Understandably, the pressurizing component 80 can play a certain role in heat conduction. That is to say, during the process of the hot air blown out by the blower 20 heating the battery cell 100, the pressurizing component 80 will also be heated by the hot air. The pressurizing component 80 is in contact with the battery cell 100, thereby accelerating the heating of the battery cell 100; during the process of the cold air blown out by the blower 20 cooling the battery cell 100, the pressurizing component 80 will also be cooled by the cold air. The pressurizing component 80 is in contact with the battery cell 100, thereby accelerating the cooling of the battery cell 100.

[0213] Thus, by introducing the first fin 83, the above technical solution can increase the overall surface area of ​​the pressurizing component 80, thereby effectively improving the heat conduction effect of the pressurizing component 80 and further improving the battery testing efficiency.

[0214] In some embodiments, a second fin 84 is provided on the side of the second pressurizing member 82 facing away from the first pressurizing member 81.

[0215] For example, the second fin 84 protrudes from the surface of the second pressure member 82 on the side opposite to the second pressure member 82. The second fin 84 can be detachably connected to the second pressure member 82, or it can be integrally formed on the second pressure member 82. The second fin 84 can be directly connected to the second pressure member 82, or it can be constrained to the second pressure member 82 by other components. As an example, the connection method between the second fin 84 and the second pressure member 82 can be, but is not limited to, bolting, welding, riveting, snap-fitting, or bonding.

[0216] In some examples, the second pressure member 82 and the second fin 84 are integrally formed. On the one hand, this eliminates the need for additional joining processes to connect the second pressure member 82 and the second fin 84, simplifying the manufacturing process. On the other hand, compared to joining the second pressure member 82 and the second fin 84 through additional joining processes, the integral structure of the second pressure member 82 and the second fin 84 provides a stronger connection.

[0217] The above technical solution, by introducing a second fin 84, can increase the overall surface area of ​​the pressurizing component 80, thereby effectively improving the heat conduction effect of the pressurizing component 80 and further improving the battery testing efficiency.

[0218] In some embodiments, a first buffer 85 is provided on the side of the first pressure member 81 near the second pressure member 82, and the hardness of the first buffer 85 is less than the hardness of the first pressure member 81.

[0219] For example, the first buffer 85 can be detachably connected to the first pressure member 81, or it can be integrally disposed on the first pressure member 81. The first buffer 85 can be directly connected to the first pressure member 81, or it can be constrained to the first pressure member 81 by other components. As an example, the connection method between the first buffer 85 and the first pressure member 81 can be, but is not limited to, bolt connection, welding, riveting, snap-fit ​​or bonding.

[0220] In some examples, the first pressure-applying component 81 and the first buffer component 85 are integrally formed. On the one hand, there is no need to connect the first pressure-applying component 81 and the first buffer component 85 through an additional connecting process, simplifying the manufacturing process. On the other hand, compared with connecting the first pressure-applying component 81 and the first buffer component 85 through an additional connecting process, the integral structure of the first pressure-applying component 81 and the first buffer component 85 has a higher connection strength.

[0221] The hardness of the first pressure-applying component 81 and the first buffer component 85 can be obtained by methods such as Shore hardness, Brinell hardness, or Rockwell hardness. As an example, in Shore hardness testing, a Shore hardness tester with a truncated conical indenter is used. The indenter is pressed into the material surface under a specified load, and the hardness value is read. A higher hardness value indicates a harder material. The specific procedures for Brinell and Rockwell hardness testing can be found in existing technical literature and will not be elaborated here.

[0222] Optionally, the material of the first buffer 85 may be, but is not limited to, silicone, rubber, or latex.

[0223] The above technical solution sets up a first buffer 85, the hardness of which is less than that of the first pressure member 81, making the first buffer 85 softer and reducing the risk of scratching the battery cell 100 during battery testing.

[0224] In some embodiments, a second buffer 86 is provided on the side of the second pressure member 82 near the first pressure member 81, and the hardness of the second buffer 86 is less than the hardness of the second pressure member 82.

[0225] For example, the second buffer 86 can be detachably connected to the second pressure member 82, or it can be integrally disposed on the second pressure member 82. The second buffer 86 can be directly connected to the second pressure member 82, or it can be constrained to the second pressure member 82 by other components. As an example, the connection method between the second buffer 86 and the second pressure member 82 can be, but is not limited to, bolt connection, welding, riveting, snap-fitting, or bonding.

[0226] In some examples, the second pressure member 82 and the second buffer member 86 are integrally formed. On the one hand, this eliminates the need for additional connecting processes to join the second pressure member 82 and the second buffer member 86, simplifying the manufacturing process. On the other hand, compared to connecting the second pressure member 82 and the second buffer member 86 through additional connecting processes, the integral structure of the second pressure member 82 and the second buffer member 86 provides a stronger connection.

[0227] The hardness of the second pressure-applying component 82 and the second buffer component 86 can be obtained by methods such as Shore hardness, Brinell hardness, or Rockwell hardness. As an example, in Shore hardness testing, a Shore hardness tester with a truncated conical indenter is used. The indenter is pressed into the material surface under a specified load, and the hardness value is read. A higher hardness value indicates a harder material. The specific procedures for Brinell and Rockwell hardness testing can be found in existing technical literature and will not be elaborated here.

[0228] Optionally, the material of the second buffer 86 may be, but is not limited to, silicone, rubber, or latex.

[0229] The above technical solution provides a second buffer 86, which has a lower hardness than the second pressure member 82, making the second buffer 86 softer and reducing the risk of scratching the battery cell 100 during battery testing.

[0230] In some embodiments, the pressurizing component 80 is detachably connected to the supporting component 70. This facilitates the replacement and adjustment of the pressurizing component 80, improving the overall ease of use of the battery testing device.

[0231] In some embodiments, there are multiple pressurizing components 80, which are spaced apart from the bearing component 70.

[0232] For example, the multiple pressurizing components 80 can be arranged in one row or multiple rows.

[0233] In some examples, multiple pressurizing components 80 are arranged in a row along a first direction X.

[0234] In other examples, the battery testing apparatus includes multiple pressurization sequences, each pressurization sequence including at least two pressurization components 80 arranged along a first direction X, and the multiple pressurization sequences are arranged along a third direction Z.

[0235] Multiple pressurizing components 80 can adopt the same structure or different structures, as long as the pressurizing components 80 can compress the battery cell 100.

[0236] The above technical solution sets up multiple pressurizing components 80 to simultaneously pressurize multiple battery cells 100, so that the battery testing device can test multiple battery cells 100 at the same time, thereby further improving the battery testing efficiency.

[0237] Based on the battery testing apparatus provided in this application embodiment, this application embodiment also provides a battery testing method. Figure 9 This is a process flow diagram of a battery testing method provided in some embodiments of this application. Continuing with... Figure 9As shown, the battery testing method may include steps 01, 02, 03, 04 and 05.

[0238] Step 01: Place the battery cell 100 into the receiving cavity 11 of the cabinet 10;

[0239] Step 02: Control the heating component 30 to heat the air blown out by the blower 20 so that the air at the first preset temperature is blown into the receiving cavity 11;

[0240] Step 03: When the battery cell 100 has been in the air at the first preset temperature for a period of time, the cooling component 40 is controlled to cool the air blown out by the blower 20 so that the air at the second preset temperature is blown into the receiving cavity 11.

[0241] Step 04: Place the battery cell 100 in the wind at a second preset temperature and obtain the change in voltage of the battery cell 100 over time.

[0242] Step 05: Based on the magnitude of the voltage change over time, generate the test results for battery cell 100. The test results include abnormal self-discharge or normal self-discharge.

[0243] The above steps will be described in detail below with reference to specific embodiments.

[0244] Specifically, regarding step 01 above, when starting the battery self-discharge test, the battery cell 100 to be tested is first placed inside the cabinet 10 of the battery testing device. The housing 11 of the cabinet 10 provides a sealed or relatively sealed testing environment for the battery cell 100, isolating it from external air interference. To ensure testing accuracy, before placing the battery cell 100, the cabinet 10 is checked to ensure it is clean and dust-free inside and out, minimizing the interference of external factors on the test results.

[0245] In some examples, the battery cell 100 can be fixed by the support component 70 to keep it stable during the test and reduce the impact of vibration or displacement on the test results.

[0246] In some examples, a pressurizing component 80 can be used to pressurize the battery cell 100, which can reduce the electrode spacing of the battery cell 100 and accelerate the formation of micro-short circuits inside the battery cell 100, thereby further improving the efficiency and accuracy of battery testing.

[0247] Next, in step 02 above, after the battery cell 100 is placed, an airflow at a first preset temperature is blown into the receiving cavity 11. This can be achieved by controlling the blower 20 and the heating element 30 to introduce the airflow at the first preset temperature into the receiving cavity 11.

[0248] In some examples, the first preset temperature is 50℃-95℃. As an example, the first preset temperature can be, but is not limited to, 50℃, 55℃, 60℃, 65℃, 70℃, 75℃, 80℃, 85℃, 90℃, or 95℃. It should be noted that the first preset temperature can be a temperature range; that is, in this example, the first preset temperature only needs to be within the range of 50℃-95℃. The specific temperature can be selected according to the actual application environment.

[0249] In some examples, the first preset temperature is 65℃-85℃. As an example, the first preset temperature can be, but is not limited to, 65℃, 66℃, 67℃, 68℃, 69℃, 70℃, 72℃, 74℃, 76℃, 78℃, 80℃, 82℃, 84℃, and 85℃. It should be noted that in this example, the first preset temperature only needs to be within the range of 50℃-95℃; the specific temperature can be selected according to the actual application environment.

[0250] The purpose of step 02 is to subject the battery cell 100 to high-temperature aging to accelerate testing efficiency. The purpose of high-temperature aging is to eliminate internal polarization of the battery cell 100, while accelerating the dissolution and piercing of the separator by metal particles such as copper, iron, and stainless steel, forming internal physical pathways.

[0251] Next, regarding step 03 above, the purpose of placing the battery cell 100 in air at a first preset temperature for a first preset time is to allow the battery cell 100 to undergo sufficient high-temperature aging to improve the accuracy of the test. Then, air at a second preset temperature is blown into the receiving cavity 11. This can be achieved by controlling the blower 20 and cooling components 40 to introduce an airflow with the second preset temperature into the receiving cavity 11. This lowers the temperature of the battery cell 100 to room temperature, reducing the impact of temperature on voltage measurement.

[0252] In some examples, the first preset time is 1 hour to 10 hours. As an example, the first preset time can be, but is not limited to, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, or 10 hours. It should be noted that the first preset time can be a time range; that is, in this example, the first preset time can be within the range of 1 hour to 10 hours. The specific time can be selected according to the actual application environment.

[0253] In some examples, the first preset time is 2 hours to 6 hours. As an example, the first preset time can be, but is not limited to, 2 hours, 2.5 hours, 3 hours, 3.5 hours, 4 hours, 4.5 hours, or 6 hours. It should be noted that in this example, the first preset time only needs to be within the 2-6 hour range; the specific time can be selected according to the actual application environment.

[0254] In some examples, the second preset temperature is 0℃-25℃. As an example, the second preset temperature can be, but is not limited to, 0℃, 5℃, 10℃, 15℃, 20℃, or 25℃. It should be noted that the second preset temperature can be a temperature range; that is, in this example, the second preset temperature only needs to be within the range of 0℃-25℃. The specific temperature can be selected according to the actual application environment.

[0255] In some examples, the second preset temperature is 0℃-15℃. As an example, the second preset temperature can be, but is not limited to, 0℃, 1℃, 2℃, 3℃, 4℃, 5℃, 6℃, 7℃, 8℃, 9℃, 10℃, 11℃, 12℃, 13℃, 14℃, or 15℃. It should be noted that in this example, the second preset temperature only needs to be within the 0℃-15℃ range; the specific temperature can be selected according to the actual application environment.

[0256] Next, regarding step 04 above, the battery cell 100 is left to stand at room temperature. The change in voltage of the battery cell 100 over time can be understood as the difference between the voltages measured at different times when the voltage of the battery cell 100 is measured.

[0257] Next, regarding step 05 above, based on the magnitude of the voltage change over time, it is determined whether battery cell 100 has an abnormal self-discharge or a normal self-discharge.

[0258] For example, if the change in voltage over time is greater than or equal to a first threshold, the test result is an abnormal self-discharge; if the change in voltage over time is less than the first threshold, the test result is a normal self-discharge. The first threshold can be calculated based on relevant theories.

[0259] The heating element 30 heats the air blown by the blower 20, allowing the hot air to fully and directly contact the surface of the battery cell 100, thus rapidly increasing its temperature. Conversely, the cooling element 40 cools the air blown by the blower 20, allowing the cold air to fully and directly contact the surface of the battery cell 100, thus rapidly decreasing its temperature. Furthermore, the blowing method has relatively low structural complexity and cost, enabling relatively simple simultaneous heating or cooling of multiple battery cells 100. Therefore, this technical solution can significantly shorten the time required for self-discharge testing, thereby effectively improving battery testing efficiency.

[0260] In some embodiments, the step of placing the battery cell 100 in a breeze at a second preset temperature and obtaining the change in voltage of the battery cell 100 over time includes:

[0261] The battery cell 100 is placed in the wind at a second preset temperature for a second preset time, and the voltage of the battery cell 100 at a first moment is obtained to obtain a first voltage value.

[0262] Continue to let the battery cell 100 stand still in the wind at the second preset temperature for a third preset time, and obtain the voltage of the battery cell 100 at the second moment to obtain the second voltage value.

[0263] Calculate the ratio of the difference between the first and second voltage values ​​to the difference between the first and second time points to obtain the change in voltage over time.

[0264] For example, the purpose of placing the battery cell 100 in the air at a second preset temperature for a second preset time is to allow the battery cell 100 to sufficiently cool down to room temperature, reducing the influence of temperature on voltage measurement and thus improving the accuracy of the test. After measuring the voltage of the battery cell 100 at a first moment to obtain a first voltage value, the battery cell 100 is then placed in the air at a second preset temperature for a third preset time. The purpose is to further allow the battery cell 100 to settle at room temperature, providing a certain time interval for measuring the voltage of the battery cell 100 at a second moment to obtain a second voltage value, thereby improving the reliability of the test.

[0265] The voltage difference is obtained by subtracting the first voltage value from the second voltage value, and the time difference is obtained by subtracting the first time value from the second time value. The ratio of the voltage difference to the time difference is the change in voltage over time. In other words, the magnitude of the ratio of the voltage difference to the time difference can be used to determine whether a single battery cell has abnormal self-discharge or normal self-discharge.

[0266] In some examples, the second preset time is 2 hours to 12 hours. As an example, the second preset time can be, but is not limited to, 2 hours, 3 hours, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours, 11 hours, or 12 hours. It should be noted that the second preset time can be a time range; that is, in this example, the second preset time only needs to be within the range of 2 hours to 12 hours. The specific time can be selected according to the actual application environment.

[0267] In some examples, the second preset time is 4-9 hours. As an example, the second preset time can be, but is not limited to, 4 hours, 4.5 hours, 5 hours, 5.5 hours, 6 hours, 6.5 hours, 7 hours, 7.5 hours, 8 hours, 8.5 hours, or 9 hours. It should be noted that in this example, the second preset time only needs to be within the 4-9 hour range; the specific time can be selected based on the actual application environment. In some examples, the third preset time is 2-30 hours. As an example, the third preset time can be, but is not limited to, 2 hours, 5 hours, 10 hours, 15 hours, 20 hours, 25 hours, or 30 hours. It should be noted that the third preset time can be a time range; that is, in this example, the third preset time only needs to be within the 2-30 hour range; the specific time can be selected based on the actual application environment.

[0268] In some examples, the third preset time is 4 hours to 24 hours. As an example, the third preset time can be, but is not limited to, 4 hours, 5 hours, 6 hours, 7 hours, 8 hours, 9 hours, 10 hours, 12 hours, 14 hours, 16 hours, 18 hours, 20 hours, 22 hours, or 24 hours. It should be noted that in this example, the third preset time only needs to be within the 4-24 hour range; the specific time can be selected according to the actual application environment.

[0269] The above technical solution first places the battery cell 100 in the air at a second preset temperature for a period of time to allow the various performance characteristics of the battery cell 100 to stabilize before measuring the voltage of the battery cell 100. This can reduce the test error and help to further improve the accuracy of battery testing.

[0270] In some embodiments, step 03 above further includes:

[0271] When the battery cell 100 is left to stand in the wind at the first preset temperature for a first preset time, the heating component 30 and the blower 20 are stopped.

[0272] The exhaust fan 90 is controlled to extract the hot air from the receiving cavity 11;

[0273] The cooling component 40 cools the air blown out by the blower 20 so that air at a second preset temperature is blown into the receiving cavity 11.

[0274] For example, the heating component 30 heats the air blown out by the blower 20. After the hot air enters the housing cavity 11 and completes the heating of the battery cell 100, the hot air in the housing cavity 11 is first extracted by the exhaust fan 90, and then the air blown out by the blower 20 is cooled by the cooling component 40. The cold air enters the housing cavity 11 to cool down the battery cell 100.

[0275] The single working time of the exhaust fan 90 can be 1 minute to 10 minutes. Specifically, after the exhaust fan 90 extracts the hot air from the receiving cavity 11 for 1 minute to 10 minutes, the air blown out by the blower 20 can be cooled by the cooling component 40, so that the cold air enters the receiving cavity 11 to cool down the battery cell 100.

[0276] As an example, the single operating time of the exhaust fan 90 can be, but is not limited to, 1 minute, 2 minutes, 3 minutes, 4 minutes, 5 minutes, 6 minutes, 7 minutes, 8 minutes, 9 minutes, or 10 minutes. It should be noted that the single operating time of the exhaust fan 90 can be a time range; that is, in this example, the single operating time of the exhaust fan 90 can be within the range of 1 minute to 10 minutes. The specific time can be selected according to the actual application environment.

[0277] In some examples, the single-run time of the exhaust fan 90 can be 1 minute to 5 minutes.

[0278] The above technical solution can reduce the energy consumption during temperature switching inside the containment cavity 11 during the self-discharge test of the battery cell 100, thereby helping to reduce the battery testing cost.

[0279] Unless otherwise specified, the battery testing method of this application is implemented using the battery testing device of this application, and all the technical features of the battery testing device mentioned in the embodiments of this application can be applied to the testing method mentioned in the embodiments of this application.

[0280] According to some embodiments of this application, this application also provides a battery production apparatus, including a battery testing device according to any of the above schemes.

[0281] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions. All technical features and optional technical features of this application can be combined to form new technical solutions.

[0282] To better understand the battery testing apparatus provided in the embodiments of this application, based on the same inventive concept, embodiments of the above-mentioned battery testing apparatus in practical applications are described herein.

[0283] This application provides a battery testing device, which includes a cabinet 10, a blower 20, a heating component 30, a cooling component 40, a detection component 50, and a control component 60.

[0284] The cabinet 10 has an internal cavity 11 for accommodating battery cells 100. The cabinet 10 also has an air inlet 12 connected to the cavity 11. A blower 20 is connected to the air inlet 12 and blows air into the cavity 11. A heating element 30 is connected to the blower 20 and heats the air blown out by the blower 20. A cooling element 40 is connected to the blower 20 and cools the air blown out by the blower 20. A detection element 50 is located inside the cabinet 10 and detects the surface temperature of the battery cells 100. A control element 60 is connected to the detection element 50, the heating element 30, and the cooling element 40, and controls the operating parameters of the heating element 30 and the cooling element 40 based on the detection information from the detection element 50.

[0285] The cabinet 10 includes a main body 13 and a first wall portion 14. The main body 13 has a cabinet opening along a first direction X, and the first wall portion 14 is pivotally connected to the main body 13 and used to cover the cabinet opening. The main body 13 includes a second wall portion 131 along a second direction Y, and an air outlet 15 is provided on the second wall portion 131, which communicates with the receiving cavity 11. The battery testing device also includes an exhaust fan 90, which is communicated with the air outlet 15. The main body 13 also includes a third wall portion 132 and a fourth wall portion 133 opposite each other along a third direction Z. The air inlet 12 includes a first inlet 121 and a second inlet 122. The first inlet 121 is disposed on the third wall portion 132, and the second inlet 122 is disposed on the fourth wall portion 133. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0286] The heating element 30 heats the air blown by the blower 20, allowing the hot air to fully and directly contact the surface of the battery cell 100, thus rapidly increasing its temperature. Conversely, the cooling element 40 cools the air blown by the blower 20, allowing the cold air to fully and directly contact the surface of the battery cell 100, thus rapidly decreasing its temperature. Furthermore, the blowing method has relatively low structural complexity and cost, enabling relatively simple simultaneous heating or cooling of multiple battery cells 100. Therefore, this technical solution can significantly shorten the time required for self-discharge testing, thereby effectively improving battery testing efficiency.

[0287] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery testing device, characterized in that, include: The cabinet has an internal cavity for accommodating individual battery cells, and the cabinet has an air inlet connected to the cavity. A blower is connected to the air inlet and is used to blow air into the receiving cavity; A heating element is connected to the blower, and the heating element is used to heat the air blown out by the blower. A cooling component is connected to the blower and is used to cool the air blown out by the blower.

2. The battery testing apparatus according to claim 1, characterized in that, The battery testing device also includes a detection component, which is disposed inside the cabinet and is used to detect the temperature of the surface of the battery cell.

3. The battery testing apparatus according to claim 2, characterized in that, The battery testing device further includes a control component, which is connected to the detection component, the heating component, and the cooling component. The control component is used to control the operating parameters of the heating component and the cooling component based on the detection information from the detection component.

4. The battery testing apparatus according to any one of claims 1-3, characterized in that, The cabinet is also provided with an air outlet, which is connected to the receiving cavity; The battery testing device also includes a fan, which is connected to the air outlet.

5. The battery testing apparatus according to any one of claims 1-4, characterized in that, The cabinet includes a body and a first wall portion. The body has a cabinet opening along a first direction, and the first wall portion is pivotally connected to the body and used to cover the cabinet opening.

6. The battery testing apparatus according to claim 5, characterized in that, The body includes a second wall portion along a second direction, and an air outlet is provided on the second wall portion. The air outlet is connected to the receiving cavity, and the first direction intersects the second direction. The battery testing device also includes a fan, which is connected to the air outlet.

7. The battery testing apparatus according to claim 6, characterized in that, The body also includes a third wall and a fourth wall that are opposite each other along a third direction. The air inlet includes a first inlet and a second inlet. The first inlet is disposed on the third wall and the second inlet is disposed on the fourth wall. The first direction, the second direction and the third direction are perpendicular to each other.

8. The battery testing apparatus according to any one of claims 1-7, characterized in that, The battery testing device further includes a support component and a pressurizing component. The support component is used to support the battery cell, and the pressurizing component is disposed on the support component and used to compress the battery cell.

9. The battery testing apparatus according to claim 8, characterized in that, The pressurizing component includes a first pressurizing member and a second pressurizing member disposed opposite to each other along a first direction, with the first pressurizing member and the second pressurizing member used to place the battery cell.

10. The battery testing apparatus according to claim 9, characterized in that, The bearing component has a cavity, the pressurizing component is disposed in the cavity, and the first pressurizing component and the second pressurizing component are respectively disposed on both sides of the cavity along the first direction.

11. The battery testing apparatus according to claim 10, characterized in that, The supporting component includes a frame and a supporting plate. The frame has a first opening and a second opening at both ends along the second direction. The cavity connects the first opening and the second opening. The supporting plate is detachably connected to the frame and covers the first opening. The supporting plate is used to support the battery cell. The pressurizing component is connected to the frame. The first direction and the second direction intersect.

12. The battery testing apparatus according to claim 11, characterized in that, The support plate has a recessed portion, which is recessed relative to the side of the support plate facing the cavity, and the recessed portion is used to insert the battery cell.

13. The battery testing apparatus according to claim 11, characterized in that, The first pressure member includes a first main body and two first connecting parts. The two first connecting parts are respectively connected to the two ends of the first main body along the third direction. The first main body protrudes toward the second pressure member. The first connecting parts are connected to the frame. The first direction, the second direction and the third direction are perpendicular to each other.

14. The battery testing apparatus according to claim 13, characterized in that, The cavity has a first groove on each of its two opposing sides along the third direction, and the two first connecting parts are respectively inserted into the first grooves on the two sides of the cavity wall.

15. The battery testing apparatus according to claim 9, characterized in that, At least a portion of the first pressure member protrudes toward the second pressure member; and / or, At least a portion of the second pressure member protrudes toward the first pressure member.

16. The battery testing apparatus according to claim 9, characterized in that, At least one of the first pressure member and the second pressure member is an elastomer.

17. The battery testing apparatus according to claim 9, characterized in that, At least one of the first pressurizing member and the second pressurizing member is a sheet-like structure.

18. The battery testing apparatus according to claim 9, characterized in that, The first pressurizing member has a first fin on the side facing away from the second pressurizing member; and / or, The second pressure member has a second fin on the side opposite to the first pressure member.

19. The battery testing apparatus according to claim 9, characterized in that, A first buffer is provided on the side of the first pressure member closest to the second pressure member, and the hardness of the first buffer is less than the hardness of the first pressure member; and / or, A second buffer is provided on the side of the second pressure member that is close to the first pressure member, and the hardness of the second buffer is less than that of the second pressure member.

20. The battery testing apparatus according to claim 8, characterized in that, The pressurizing component is detachably connected to the bearing component.

21. The battery testing apparatus according to claim 8, characterized in that, The number of pressurizing components is multiple, and the multiple pressurizing components are spaced apart from the bearing component.

22. A battery testing method, characterized in that, include: The individual battery cells are placed in the cabinet's receiving cavity; The heating element is controlled to heat the air blown out by the blower, so that the air at the first preset temperature is blown into the receiving cavity; When the battery cell has been in the air at the first preset temperature for a period of time, the cooling component is controlled to cool the air blown out by the blower so that the air at the second preset temperature is blown into the receiving cavity. The battery cell is placed in a wind at the second preset temperature and the change in voltage of the battery cell over time is obtained. Based on the magnitude of the voltage change over time, test results for the individual battery cells are generated, including abnormal self-discharge or normal self-discharge.

23. The method according to claim 22, characterized in that, The step of placing the battery cell in a wind at the second preset temperature and obtaining the change in voltage of the battery cell over time includes: The battery cell is placed in the wind at the second preset temperature for a second preset time, and the voltage of the battery cell is obtained at a first moment to obtain a first voltage value. The battery cell is left to stand in the wind at the second preset temperature for a third preset time, and the voltage of the battery cell is obtained at the second moment to obtain the second voltage value. Calculate the ratio of the difference between the first voltage and the second voltage value to the difference between the first time moment and the second time moment to obtain the change of the voltage over time.

24. The method according to claim 22, characterized in that, The step of controlling the cooling components to cool the air blown out by the blower when the battery cell has been left to stand in the air at the first preset temperature for a first preset time, so that air at the second preset temperature is blown into the receiving cavity, further includes: If the battery cell remains in the wind at the first preset temperature for a period of time, the heating element and the blower shall be stopped. The exhaust fan is controlled to extract the hot air from the accommodating cavity; The cooling component is controlled to cool the air blown out by the blower, so that the air at the second preset temperature is blown into the receiving cavity.

25. A battery manufacturing apparatus, characterized in that, Includes the battery testing apparatus as described in any one of claims 1-21.

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