Strength testing device for battery shell

Abstract

The utility model relates to the technical field of batteries, and provides a strength testing device for a battery shell, the strength testing device comprises a loading structure, an abutting structure and a swing arm opening and closing structure, the abutting structure is configured to be capable of abutting against the battery shell from the inner side of the battery shell, and the swing arm opening and closing structure comprises a swing arm; the swing arm is movably arranged, has an opening state and a retracting state, is connected with the abutting structure, and at least can drive the abutting structure to move back and forth along a straight line in the switching process between the opening state and the retracting state. The strength testing device can more accurately simulate the actual working condition in the charging and discharging process of the battery module, and the testing reliability can be improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a strength testing device for a battery housing. Background Art

[0002] A lithium battery includes a battery module and a battery housing that wraps around the outer periphery of the battery module. During frequent charging and discharging, the battery module will expand and contract repeatedly due to temperature changes. During the expansion process of the battery module, a force will be generated and pressed against the battery housing, which will cause fatigue damage to the battery housing.

[0003] To study the influence of the repeated expansion and contraction of the battery module on the battery housing, it is necessary to collect the magnitude of the force generated by the expansion of the battery module and the offset when the battery housing is damaged, and it is necessary to simulate the working conditions of the battery module with the help of a testing device. The testing devices in the related art have the problem of a single simulation method, resulting in the inability to match the actual working conditions of the battery module and low testing reliability. Utility Model Content

[0004] This application provides a strength testing device for a battery housing, which can more accurately simulate the actual working conditions during the charging and discharging process of the battery module and improve the testing reliability.

[0005] One aspect of this application provides a strength testing device for a battery housing, including:

[0006] A loading structure for installing the battery housing;

[0007] A pressing structure configured to be able to press against the battery housing from the inside of the battery housing;

[0008] And a swing arm opening and closing structure, including a swing arm. The swing arm is movably arranged and has an expanded state and a retracted state. The swing arm is connected to the pressing structure, and the swing arm can at least drive the pressing structure to move back and forth during the process of switching between the expanded state and the retracted state.

[0009] The strength testing device in the embodiment of the present application includes a loading structure, a pressing structure, and a swing arm opening and closing structure. The swing arm in the swing arm opening and closing structure is movably arranged and has an expanded state and a retracted state. The swing arms in the expanded state and the retracted state have different spatial orientation states, so that the distances between the two ends of the swing arm in the same direction change. This change enables the swing arm to act on the pressing structure and push the pressing structure to move. The pressing structure can move back and forth during the process of the swing arm switching from the expanded state to the retracted state or from the retracted state to the expanded state, so as to realize the basic action of simulating the expansion and contraction of the battery module. On the basis of the above action simulation, the action of the pressing structure is realized based on the swing of the swing arm. There is a conversion of the motion mode from the swing of the swing arm to the linear movement of the pressing structure. This conversion mode is mainly reflected in the inclination change of the swing arm in space, and this change is not linear, so that the pressing structure can move in a way of changing speed. At the same time, the driving force received by the pressing structure at different times is also different. The combination of the two enables the pressing structure to act on the battery housing in more flexible ways, making the action of the pressing structure closer to the actual working conditions of the battery module. In addition, the pressing structure acts on the battery housing from the inside, which can further improve the authenticity of the action simulation.

[0010] In summary, the strength testing device in the embodiment of the present application can more accurately simulate the actual working conditions during the charging and discharging process of the battery module through the combination of the swing arm and the pressing structure, and can improve the test reliability.

[0011] In a possible implementation manner, the swing arm opening and closing structure is configured to be able to move back and forth along a first direction and expand or retract the swing arm, and the pressing structure moves back and forth along a second direction.

[0012] In a possible implementation manner, the first direction and the second direction are perpendicular to each other.

[0013] In a possible implementation manner, the swing arm opening and closing structure includes:

[0014] A swing arm seat, the swing arm is movably connected between the swing arm seat and the pressing structure, and the swing arm seat can move along the first direction.

[0015] In a possible implementation manner, a first rotating shaft is provided on the swing arm seat, one end of the swing arm is connected to the first rotating shaft, a second rotating shaft is provided on the pressing structure, and the other end of the swing arm is connected to the second rotating shaft.

[0016] In a possible implementation manner, the strength testing device further includes:

[0017] The first driving structure, the swing arm opening and closing structure is connected to the output end of the first driving structure, and the swing arm opening and closing structure realizes reciprocating movement along the first direction under the drive of the first driving structure.

[0018] In a possible implementation manner, the first driving structure includes:

[0019] A first actuator, the first actuator is connected to the swing arm opening and closing structure;

[0020] And a first driving module, the first driving module is used to drive the first actuator to reciprocate along the first direction.

[0021] In a possible implementation manner, the first driving module includes:

[0022] A first driving unit;

[0023] And a lead screw mechanism, the first driving unit is connected to the lead screw mechanism, the first driving unit is used to drive the lead screw in the lead screw mechanism to rotate, and the first actuator is connected to the lead screw.

[0024] In a possible implementation manner, the lead screw mechanism includes:

[0025] A housing having an accommodation cavity, the lead screw is arranged in the accommodation cavity;

[0026] And an expander, the expander is installed on the lead screw and at least a part of it extends out of the housing, and the expander is connected to the first actuator.

[0027] In a possible implementation manner, the swing arm includes a free end and a hinged end, the swing arm can swing around the hinged end, and the free end is movably connected to the pressing structure.

[0028] In a possible implementation manner, the swing arm opening and closing structure further includes:

[0029] A swing arm seat, the hinged end of the swing arm is connected to the swing arm seat;

[0030] And a second driving structure, the second driving structure is connected between the swing arm seat and the swing arm, and can form a force on the swing arm and drive the swing arm to swing.

[0031] In a possible implementation manner, the swing arm includes a multi-link mechanism.

[0032] In a possible implementation manner, the pressing structure includes:

[0033] A pressing head;

[0034] and a pressure sensor, one side of the pressure sensor is connected to the indenter, and the other side of the pressure sensor is connected to the swing arm.

[0035] In a possible implementation manner, the loading structure includes:

[0036] a plurality of mounting blocks, the battery housing can be mounted on the mounting blocks and is supported by the mounting blocks in a suspended state.

[0037] In a possible implementation manner, the mounting blocks are formed with mounting holes, and the mounting holes are arranged longitudinally and / or transversely.

[0038] In a possible implementation manner, the pressing structure includes at least two pressing units, the swing arm opening and closing structure includes at least two swing arms, and the swing arms are respectively connected to the pressing units in a corresponding manner.

[0039] In a possible implementation manner, the pressing structure includes a first pressing unit and a second pressing unit, the swing arm opening and closing structure includes a first swing arm and a second swing arm, the first swing arm is connected to the first pressing unit, and the second swing arm is connected to the second pressing unit.

[0040] In a possible implementation manner, the first pressing unit and the second pressing unit are arranged opposite to each other, and the first swing arm and the second swing arm are arranged opposite to each other.

[0041] In a possible implementation manner, the strength testing device further includes:

[0042] a moving guide rail, the pressing structure is arranged on the moving guide rail and can move along the moving guide rail.

[0043] In a possible implementation manner, the strength testing device further includes:

[0044] a displacement monitoring structure, the displacement monitoring structure is used to monitor and record the displacement amount of the pressing structure. Description of the Drawings

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0046] Figure 1 shows an external view of a strength testing device for a battery housing provided according to an embodiment of the present application;

[0047] Figure 2 The figure shows a schematic structural diagram of a strength testing device for a battery housing after removing the outer cover according to an embodiment of the present application;

[0048] Figure 3 The figure shows a schematic structural diagram of a strength testing device for a battery housing after removing the base according to an embodiment of the present application;

[0049] Figure 4 The figure shows a schematic structural diagram of a strength testing device for a battery housing according to an embodiment of the present application;

[0050] Figure 5 The figure shows Figure 4 a partial enlarged view of part A in

[0051] Reference numerals:

[0052] 100 - Loading structure; 110 - Mounting block; 111 - Mounting hole;

[0053] 200 - Pressing structure; 210 - Second rotating shaft; 220 - Pressing head; 230 - Pressure sensor; 240 - Pressing housing; 201 - First pressing unit; 202 - Second pressing unit;

[0054] 300 - Swing arm opening and closing structure; 310 - Swing arm; 320 - Swing arm seat; 311 - Free end; 312 - Hinged end; 313 - First swing arm; 314 - Second swing arm; 321 - First rotating shaft; 322 - Side wall; 323 - Bottom wall;

[0055] 400 - Outer cover;

[0056] 500 - Base;

[0057] 600 - Support plate;

[0058] 700 - Moving guide rail; 710 - Slide block;

[0059] 800 - First driving structure; 810 - First actuator; 820 - First driving module; 821 - First driving unit; 822 - Lead screw mechanism; 823 - Sealing cover; 824 - Reducer; 8221 - Housing; 8222 - Expander;

[0060] 900 - Displacement monitoring structure; 910 - Mounting frame; 920 - Receiver; 930 - Transmitter;

[0061] 10 - Battery housing. Detailed implementation manners

[0062] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0063] For a lithium battery, especially a lithium battery with a high energy density, during the frequent charging and discharging process of the internal battery module, it will repeatedly expand and contract due to temperature changes. During charging, due to the intense reaction inside the battery module, high temperatures are easily generated, which can cause the battery module to expand. This expansion phenomenon will form a force and act on the battery case outside the battery module. During discharging, the battery module will contract to a certain extent. The repeated alternation of this expansion and contraction will, over time, cause irreversible fatigue damage to the battery case.

[0064] To study the impact of the repeated expansion and contraction of the battery module on the battery case, in the related art, it is necessary to use a test device to simulate the working conditions of the battery module, convert the working conditions of the battery module into the actions of certain mechanisms in the test device, and then these mechanisms act on the battery case fixed in the test device. After multiple tests until the battery case is damaged, various data that can characterize the fatigue strength of the battery case are recorded during the test, such as the magnitude of the force generated by the mechanism on the battery module, the movement stroke of the mechanism, etc. By obtaining these data and studying these data, it provides a guiding role for the specific design methods of the battery case. These design methods include the specific connection method between the battery case and the battery module and the specific design method of the battery case, etc.

[0065] It can be understood that the actual working conditions of the battery module during the charging and discharging process are complex and changeable. The force generated by it can be large or small, and the concentration and suddenness of the force are also unpredictable. It is really not easy to design a corresponding test device for such complex working conditions. For example, the test devices in the related art generally only perform one-way movement and can only simulate the expansion process of the battery module, but cannot simulate the contraction process. Another example is that although some test devices can perform two-way movement, the movement mode is single and the movement speed cannot be adjusted, resulting in poor simulation effects. Therefore, the test devices in the related art all have the problem of single simulation method, resulting in the inability to match the actual working conditions of the battery module and low test reliability.

[0066] Based on the above current situation and problems of the testing device, the embodiments of the present application provide a strength testing device for a battery housing. Through the conversion of different motion modes between different mechanisms, and this conversion is not a linear change, the speed acting on the battery housing can be large or small, and the force acting on the battery housing can also change. By matching the speed and force, more complex and variable motion combinations can be formed. These motion combinations can be closer to the actual working conditions of the battery module during charge and discharge, and can improve the testing reliability of the testing device.

[0067] In the implementation of the present application, more research will be conducted on the formation of the above-mentioned motion combinations through the cooperation between different mechanisms. As for the testing device as a whole, the power input method adopted is as simple as possible. In other words, the embodiments of the present application do not necessarily achieve the above-mentioned motion combinations by changing the power input method. For example, it is not necessarily to achieve the above purpose by changing the magnitude of the input power, but more relies on the cooperation between mechanisms. Of course, it can be understood that on the basis of adopting the above mechanisms in the embodiments of the present application, the characteristics of the power input can also be changed to achieve more complex and variable working condition simulations.

[0068] The battery housing guided and developed relying on the testing device in the embodiments of the present application has better characteristics, and its fatigue strength is guaranteed. The battery housing can be applied to lithium batteries or other types of power batteries, and these batteries can be applied to vehicles, which can be sedans, buses, trucks, etc. The vehicle can be a new energy vehicle (New Energy Vehicle), such as a pure electric vehicle (Pure Electric Vehicle / Battery Electric Vehicle; abbreviation: PEV / BEV), a range extended electric vehicle (Range Extended Electric Vehicle; abbreviation: REEV), a hybrid electric vehicle (Hybrid Electric Vehicle; abbreviation: HEV), a fuel cell electric vehicle), and the vehicle can also be any vehicle with a battery.

[0069] The vehicle can also include a vehicle body, an axle, and a motor. Among them, the battery pack, the axle, and the motor can all be arranged on the vehicle body. The battery pack can be electrically connected to the motor, the motor can be connected to the axle, and the battery pack can supply power to the motor so that the motor can rotate, and the motor can drive the axle to rotate during rotation, so that the vehicle can travel.

[0070] Among them, the vehicle body may include a vehicle chassis and a body disposed on the chassis. The body may have a passenger compartment, and a driver's cab may be disposed in the passenger compartment. The driver may sit on the driver's cab to operate the vehicle. For example, structural components such as a steering wheel, a clutch, and a brake may also be disposed on the body to enable the vehicle to achieve complete functions. The present application does not make any limitations in this regard.

[0071] Figure 1 The external view of a strength testing device for a battery housing according to an embodiment of the present application is shown; Figure 2 The structural schematic diagram of a strength testing device for a battery housing according to an embodiment of the present application after removing the outer cover is shown; Figure 3 The structural schematic diagram of a strength testing device for a battery housing according to an embodiment of the present application after removing the base is shown; Figure 4 The structural schematic diagram of a strength testing device for a battery housing according to an embodiment of the present application is shown.

[0072] In the embodiment of the present application, please refer to Figures 1 to 4 , the strength testing device for a battery housing (hereinafter referred to as "strength testing device") includes a loading structure 100, a pressing structure 200, and a swing arm opening and closing structure 300. The pressing structure 200 can cooperate with the swing arm opening and closing structure 300 to achieve the above-mentioned motion combination, and act on the battery housing 10 by the pressing structure 200.

[0073] The loading structure 100 is used to load the battery housing 10 and enable the battery housing 10 to stay in the loading structure 100 in the orientation in normal use. It can be understood that the loading structure 100 can position the battery housing 10 so that the battery housing 10 can be stably loaded on the loading structure 100. The loading structure 100 can adopt a structure adapted to the battery housing 10. For example, the loading structure 100 is designed as an annular structure, and the battery housing 10 can be installed on the annular structure and its position is restricted by the annular structure. The loading structure 100 can also adopt other locking or positioning mechanisms. The present application does not make any limitations in this regard.

[0074] In addition, when designing the loading structure 100, it can be considered to position or support the battery housing 10 with as small a contact area as possible. Such a design can avoid affecting the test result due to the intervention of the loading structure 100 when testing the battery housing 10. When the contact area between the loading structure 100 and the battery housing 10 is small enough, the action of the pressing structure 200 on the battery housing 10 can be undisturbed, and the accuracy of the test result can be improved.

[0075] The pressing structure 200 is configured to be able to press against the battery housing 10 from the inside of the battery housing 10. It can be understood that during the charging and discharging process of the battery module, the action of the battery module on the battery housing 10 is from the inside to the outside. Designing the pressing structure 200 as above can better match the actual working conditions of the battery module and improve the accuracy of the test results.

[0076] When conducting a specific design, the pressing structure 200 can be arranged inside the battery housing 10. For example, after installing the battery housing 10 onto the aforementioned loading structure 100, the pressing structure 200 can be arranged within the space where the battery housing 10 is located. Or, when designing the pressing structure 200, at least the movable part thereof is located inside the battery housing 10.

[0077] The swing arm opening and closing structure 300 includes a swing arm 310. The swing arm 310 is movably arranged and has an expanded state and a retracted state. The swing arm 310 is connected to the pressing structure 200, and during the process of switching between the expanded state and the retracted state, the swing arm 310 can drive the pressing structure 200 to move back and forth in a straight line.

[0078] It should be noted here that the expanded state and the retracted state are descriptions based on each other as a reference. That is, during a state conversion process, the swing arm 310 can change from the expanded state to the retracted state. In other words, the expanded state and the retracted state in the embodiments of the present application represent relative states and do not mean that the swing arm 310 only has two positions.

[0079] In the structural design of the swing arm 310 in the present application, it mainly utilizes the motion characteristic that during the motion transmission process, the swing arm 310 does not apply all the acting forces or all the motions to the next target, but applies a component force of the acting force and a component motion of all the motions to the next target. It can be understood that when the inclination angle of the swing arm 310 changes, for example, when it changes between the expanded state and the retracted state, the component forces and component motions at different inclination angles are different. Based on the above characteristics of the swing arm 310, when it is applied in motion transmission, it can change the motion speed of the next target and at the same time change the acting force applied to the next target, so as to enable the pressing structure 200 to act on the battery housing 10 in a more complex and variable manner. It can be understood that the next target in the present application can be understood as the pressing structure 200.

[0080] The swing arm 310 can be designed into various shapes. As a general principle, the swing arm 310 needs to have at least one end for connecting to the pressing structure 200. For example, in some cases, the swing arm 310 can be strip-shaped, in other cases, the swing arm 310 can be bent-shaped, and in other cases, the swing arm 310 can be wavy, etc.

[0081] In addition, the swing arm 310 can adopt a double-link mechanism or a multi-link mechanism. When the double-link mechanism or the multi-link mechanism is connected to the pressing structure 200, the double-link mechanism or the multi-link mechanism can act on the pressing structure 200 in a more complex and variable manner, so as to simulate the working conditions of the battery module more realistically and improve the reliability of the test structure.

[0082] The strength testing device in the embodiment of the present application includes a loading structure 100, a pressing structure 200, and a swing arm opening and closing structure 300. The swing arm 310 in the swing arm opening and closing structure 300 is movably arranged and has an expanded state and a retracted state. The swing arm 310 in the expanded state and the swing arm 310 in the retracted state have different spatial orientation states, so that the distance between the two ends of the swing arm 310 in the same direction changes. This change enables the swing arm 310 to act on the pressing structure 200 and push the pressing structure 200 to move. The pressing structure 200 can move back and forth during the process of the swing arm 310 switching from the expanded state to the retracted state or from the retracted state to the expanded state, so as to realize the basic action of simulating the expansion and contraction of the battery module. On the basis of the above action simulation, the action of the pressing structure 200 is realized based on the swing of the swing arm 310. There is a conversion of the motion mode between the swing of the swing arm 310 and the linear movement of the pressing structure 200. This conversion mode is mainly reflected in the angular change of the swing arm 310 in space, and this change is not linear, so that the pressing structure 200 can move in a way of changing speed. At the same time, the driving force received by the pressing structure 200 at different times is also different. The combination of the two enables the pressing structure 200 to act on the battery housing 10 in more flexible ways, making the action of the pressing structure 200 closer to the actual working conditions of the battery module. In addition, the pressing structure 200 acts on the battery housing 10 from the inside, which can further improve the authenticity of the action simulation.

[0083] In the embodiment of the present application, please refer to Figures 1 to 3 , the strength testing device is designed to be a vertical structure, so that the strength testing device occupies a smaller vertical space.

[0084] For the above vertical structure, the strength testing device can be designed into a more ergonomic shape. For example, the loading structure 100 can be located at a higher position to facilitate the operator to install the battery housing 10 at the designated position. The pressing structure 200 can be set according to the position of the battery housing 10. The power input mechanism of the strength testing device can be located at a lower position. The strength testing device is designed into an up-and-down structure form as a whole. The upper end is the position where the functional structures (such as the pressing structure 200, the swing arm 310, etc.) for performing various functions are located, and the lower end is the position where the power input mechanism (such as the first driving structure 800 below) is located. The structural design is reasonable.

[0085] Based on this, please refer to Figure 1 and Figure 2 , the strength testing device further includes an outer cover 400 and a base 500. The aforementioned power input mechanism can be designed to be inside the base 500. The base 500 can include a switchable door, which is convenient for the operator to view the usage status of the power input mechanism in a timely manner, facilitating subsequent maintenance and other operations. The outer cover 400 is disposed on the base 500 and is used to cover each functional structure, which can play a necessary protective role. For example, it can handle some unexpected situations such as the battery housing 10 flying out during the test of the battery housing 10. The outer cover 400 can be made of a transparent material, such as acrylic. During the test of the battery housing 10, it is convenient for the operator to view the status of the battery housing 10 in real time. Of course, the operator can also view the status by opening a window on the outer cover 400 or making a part of the outer cover 400 transparent.

[0086] In some embodiments, please refer to Figure 2 and Figure 3 , to facilitate separating the functional structure and the power input mechanism, a support plate 600 can be configured for the power testing device. The support plate 600 can be the top plate of the aforementioned base 500. Each functional structure can be installed on the support plate 600. The power input mechanism located inside the base 500 can pass through the support plate 600 to transmit power to the swing arm opening and closing structure 300.

[0087] In other embodiments, the strength testing device can also be designed as a horizontal structure. For example, while retaining the layout of the above-mentioned functional structures, the power input mechanism is transformed into a horizontal state, or both the power input mechanism and some functional structures are designed as horizontal states, as long as the output end of the functional structure can extend into the inner side of the battery housing 10 and act on the battery housing 10. For the convenience of description and understanding, in the following embodiments, the present application will describe the functional structures and the power input mechanism with the aforementioned vertical structure strength testing device.

[0088] As can be seen from the foregoing, in the embodiments of the present application, the actual working conditions of the battery module are mainly simulated by setting the orientation of the battery housing 10 closer to the actual use state, applying an effect on the battery housing 10 inside the battery housing 10, and complex and variable motion combinations. Therefore, there are various possibilities when designing the specific structures of the loading structure 100, the pressing structure 200, and the swing arm opening and closing structure 300. For example, when designing the loading structure 100, it can be designed to fix the battery housing 10 and enable the battery housing 10 to have the above-mentioned orientation. When designing the pressing structure 200 and the swing arm opening and closing structure 300, they can be designed to cooperate to form various motion combinations. It can be understood that the battery module is composed of multiple cell units. During the charging and discharging process of the battery module, for each cell unit, the directions of its expansion and contraction are generally the same. Therefore, for the battery module, the direction of its expansion or contraction is also generally the same, mainly depending on the arrangement method of the cell units. Based on this, the embodiments of the present application mainly take the way that the pressing structure 200 moves linearly as an example for illustration. On this basis, when it is necessary to test different positions of the battery housing 10, the pressing structure 200 can be set at different positions.

[0089] In the embodiments of the present application, the function of the swing arm opening and closing structure 300 is to drive the pressing structure 200 to move linearly and at the same time realize the non-linear transmission of motion. Therefore, for the swing arm opening and closing structure 300, its main design purpose is to drive the swing arm 310 to swing so that it has an expanded state and a retracted state.

[0090] In the embodiments of the present application, mainly two ways of constructing the swing arm opening and closing structure 300 are provided. The first way is to connect the swing arm opening and closing structure 300 as a whole to the power input mechanism, and realize the required movement of the swing arm 310 through the overall movement of the swing arm opening and closing structure 300. This first way can be integrally designed in the above-mentioned vertical structure; the second way is to connect the swing arm 310 alone to another power input mechanism to realize the required movement of the swing arm 310. This second way can be integrally designed in the above-mentioned horizontal structure.

[0091] In the first type of embodiments, please refer to Figure 4 , the swing arm opening and closing structure 300 is configured to be able to move back and forth along the first direction and expand or retract the swing arm 310, and the pressing structure 200 can move along the second direction under the action of the swing arm 310.

[0092] In the first embodiment, when the swing arm opening and closing structure 300 moves along the first direction, the expansion and retraction of the swing arm 310 can be based on the first direction. When the swing arm 310 is in the expanded state, the swing arm 310 is expanded in the first direction, and when the swing arm 310 is in the retracted state, the swing arm 310 is retracted in the first direction. In short, during the movement of the swing arm opening and closing structure 300, the swing arm 310 has different spatial orientation states, so that the distance between the two ends of the swing arm 310 in the first direction changes, so that the swing arm 310 can push the pressing structure 200 to move along the second direction.

[0093] The coordination between the swing arm opening and closing structure 300 and the pressing structure 200 is conducive to simplifying the structural composition and facilitating the installation and arrangement of the pressing structure 200 and the swing arm opening and closing structure 300 .

[0094] It can be understood that the movement of the swing arm 310 is swinging, not linear motion. In the above description, in order to achieve the movement of the pressing structure 200 along the second direction, the pressing structure 200 can be set on a movable guide rail 700, so that when the swing arm 310 acts on the pressing structure 200, the pressing structure 200 can move along the movable guide rail 700.

[0095] Figure 5 Shows Figure 4 A partial enlarged view of the part A in the figure. In some embodiments, please refer to Figure 5 The movable guide rail 700 can be protruded on the aforementioned support plate 600, and a slider 710 that can be interlocked with the movable guide rail 700 is also provided on the movable guide rail 700. The pressing structure 200 can be set on the slider 710, so that the pressing structure 200 can follow the slider 710 to move along the movable guide rail 700.

[0096] In some embodiments, the movable guide rails 700 may be arranged in parallel in a pair so that the slider 710 and the pressing structure 200 can move along the movable guide rails 700 more stably.

[0097] In other embodiments, a guide structure, such as a guide rod, may be provided in parallel to one side of the movable guide rail 700 , and a through hole may be opened at a corresponding position of the slider 710 , which can cooperate with the guide rod to guide the movement of the pressing structure 200 .

[0098] In some embodiments, a position sensor may be provided on one side of the movable guide rail 700 to sense the position of the slider 710. The position sensor may limit the limit position of the movement of the slider 710 and prevent the pressing structure 200 from exceeding the predetermined stroke and causing damage.

[0099] In some specific embodiments, buffer structures may also be provided at both ends of the pressing structure 200 in the stroke direction. The buffer structures can be made of elastic materials such as rubber. After the pressing structure 200 is formed and collides with the buffer structures and the force is dissipated by the buffer structures, the pressing structure 200 can be stopped, which can protect the pressing structure 200.

[0100] In the above embodiments, the specific structural forms of the slider 710 and the buffer structure are not limited. For example, in the embodiments of the present application, both the slider 710 and the buffer structure can be designed as rectangular parallelepiped structures.

[0101] In some embodiments, please refer to Figure 4 , the first direction and the second direction are perpendicular to each other, which can make the arrangement of the pressing structure 200 and the swing arm opening and closing structure 300 more reasonable and is beneficial to reducing the overall volume of the strength testing device.

[0102] In Figure 4 In the orientation state shown, the first direction can be understood as the Z direction, that is, the swing arm opening and closing structure 300 can move up and down vertically, and the second direction can be understood as the X direction, that is, the pressing structure 200 can move back and forth in the X direction along the moving guide rail 700.

[0103] In some embodiments, please refer to Figure 4 and Figure 5 , the swing arm opening and closing structure 300 includes a swing arm seat 320. The swing arm 310 is movably connected between the swing arm seat 320 and the pressing structure 200, and the swing arm seat 320 can move along the first direction.

[0104] In this embodiment, both the swing arm seat 320 and the pressing structure 200 move linearly. The swing arm 310 is movably connected between the swing arm seat 320 and the pressing structure 200. When the swing arm seat 320 starts to move along the first direction, the swing arm seat 320 can drive the pressing structure 200 to start moving through the swing arm 310. This movement depends on the change of the inclination angle of the swing arm 310, so that the moving speed of the pressing structure 200 and the driving force of the swing arm 310 received are in a changing state, thereby realizing complex and variable motion combinations.

[0105] It can be understood that the swing arm seat 320 can be connected to the power input mechanism, and the power input mechanism can output a lifting motion along the Z direction, so as to drive the swing arm 310 to be able to move up and down in the Z direction.

[0106] In some embodiments, a first rotating shaft 321 is provided on the swing arm seat 320. One end of the swing arm 310 is connected to the first rotating shaft 321, and a second rotating shaft 210 is provided on the pressing structure 200. The other end of the swing arm 310 is connected to the second rotating shaft 210.

[0107] Thus, one end of the swing arm 310 is rotatably connected to the swing arm seat 320, and the other end of the swing arm 310 is rotatably connected to the pressing structure 200. When the power input mechanism drives the swing arm seat 320 to rise and fall along the Z direction, one end of the swing arm 310 will rotate around the first rotating shaft 321, and at the same time, the other end of the swing arm 310 will also rotate around the second rotating shaft 210, and the inclination angle of the swing arm 310 will change (such as Figure 5 β in ), so that the distance between the two ends of the swing arm 310 in the X direction changes, thereby driving the pressing structure 200 to move in the X direction. For example, when the power input mechanism drives the swing arm seat 320 to rise in the Z direction, one end of the swing arm 310 rotates clockwise around the first rotation axis 321, and the other end of the swing arm 310 also rotates clockwise around the second rotation axis 210, thereby increasing the distance between the two ends of the swing arm 310 in the X direction, thereby driving the pressing structure 200 to move rightward in the X direction. When the power input mechanism drives the swing arm seat 320 to descend in the Z direction, the pressing structure 200 will move leftward in the X direction, which will not be repeated.

[0108] In some embodiments, the swing arm seat 320 can be designed as a solid structure, and a first rotating shaft 321 is set on one side edge of the solid structure. For example, a pair of hollow lugs can be set on one side edge of the solid structure, and then the first rotating shaft 321 is inserted into the pair of hollow lugs.

[0109] In other embodiments, please refer to Figure 5 The swing arm seat 320 can be designed as a hollow structure, and a first rotating shaft 321 is arranged in the hollow structure. For example, the hollow structure can include a pair of oppositely arranged side walls 322, through holes are arranged at relative positions of the side walls 322, and then the first rotating shaft 321 is inserted into the pair of through holes.

[0110] In some embodiments, the pressing structure 200 may also be made into a structure similar to the aforementioned swing arm seat 320 , or a portion of the pressing structure 200 may adopt the above structure, so that the other end of the swing arm 310 may be rotatably mounted on the pressing structure 200 .

[0111] In the above embodiment, at least one of the first rotating shaft 321 and the second rotating shaft 210 can also be integrated on the swing arm 310, and a structure capable of accommodating the first rotating shaft 321 or the second rotating shaft 210 can be set at the corresponding position of the swing arm seat 320 or the pressing structure 200, for example, the above-mentioned hollow lug or a pair of side walls 322 can be set.

[0112] In some embodiments, please refer to Figure 4, the strength testing device further includes a first driving structure 800, which is one of the aforementioned power input mechanisms. The swing arm opening and closing structure 300 is connected to the output end of the first driving structure 800, and the swing arm opening and closing structure 300 realizes reciprocating movement along the first direction under the drive of the first driving structure 800.

[0113] The first driving structure 800 can at least output reciprocating motion along a straight line, so that the swing arm opening and closing structure 300 can move along the Z direction. Based on this, the first driving structure 800 can adopt a variety of motion mechanisms, for example, it can be a linear module, a lead screw transmission mechanism, a belt transmission mechanism, a telescopic cylinder, an electric push rod, etc. Combining the foregoing, it can be known that the first driving structure 800 can be connected to the aforementioned swing arm seat 320 and drive the swing arm seat 320 to move up and down in the Z direction. In the embodiment of the present application, considering the smoothness of transmission, the first driving structure 800 is improved on the basis of the lead screw transmission mechanism, so that the first driving structure 800 can drive the swing arm seat 320 to move stably.

[0114] As an example, please refer to Figure 4 , the first driving structure 800 includes a first actuator 810 and a first driving module 820. The first actuator 810 is connected to the swing arm opening and closing structure 300. Specifically, the first actuator 810 can be connected to the swing arm seat 320 in the swing arm opening and closing structure 300, and the first driving module 820 is used to drive the first actuator 810 to reciprocate along the first direction.

[0115] In the above first driving structure 800, a first actuator 810 is designed. The first actuator 810, as the power output end of the first driving structure 800, can perform reciprocating motion along the Z direction. The first actuator 810 can drive the swing arm seat 320 to move up and down in the Z direction under the drive of the first driving module 820.

[0116] Here, the first driving structure 800 is configured to include a first actuator 810, and then connected to the swing arm seat 320 through the first actuator 810. The first actuator 810, as a power transition component between the first driving module 820 and the swing arm seat 320, can weaken the vibration caused by directly connecting the first driving module 820 to the swing arm seat 320, which is beneficial to improving the smoothness of motion transmission.

[0117] In some embodiments, a damping structure such as a spring can be provided on the first actuator 810 or between the first actuator 810 and the swing arm seat 320 to avoid large vibrations during the motion transmission process and also play a role in reducing noise.

[0118] In some embodiments, the first actuator 810 has a structure adapted to the swing arm base 320, enabling the first actuator 810 to be stably connected to the swing arm base 320. For example, when the swing arm base 320 formed by the pair of side walls 322 is adopted as described above, the pair of side walls 322 can be connected to a bottom wall 323, and the bottom wall 323 can be designed to be disc-shaped. Correspondingly, the first actuator 810 can also be designed to be disc-shaped, enabling the first actuator 810 to be fitted and assembled onto the swing arm base 320, enhancing the connection reliability between the swing arm base 320 and the first actuator 810.

[0119] In some embodiments, please refer to Figure 4 , the first driving module 820 includes a first driving unit 821 and a lead screw mechanism 822. The first driving unit 821 is connected to the lead screw mechanism 822. The first driving unit 821 is used to drive the lead screw in the lead screw mechanism 822 to rotate, and the first actuator 810 is connected to the lead screw.

[0120] The first actuator 810 can be connected to the lead screw. For example, internal threads can be provided on the first actuator 810, and then the first actuator 810 can be connected to the lead screw by means of thread fitting. The first actuator 810 can also be indirectly connected to the lead screw. For example, a lifting block capable of moving along the lead screw can be provided on the lead screw, and then the first actuator 810 can be installed on the lifting block.

[0121] It can be understood that during the rotation of the lead screw, the first actuator 810 can move up and down along the lead screw, and the first actuator 810 can act on the aforementioned swing arm base 320, thereby driving the swing arm base 320 to move up and down in the Z direction.

[0122] In some specific embodiments, the first driving unit 821 can be selected as a servo motor, which can accurately control the movement stroke of the first actuator 810, is beneficial to accurately record the movement stroke of the pressing structure 200, and can improve the reliability of the test results. On the other hand, by controlling the forward and reverse rotation of the servo motor, the reciprocating movement of the pressing structure 200 can be realized, with fast response and convenient control.

[0123] In some specific embodiments, please refer to Figure 4 , the lead screw mechanism 822 includes a housing 8221 and an expander 8222. The housing 8221 has a receiving cavity, and the aforementioned lead screw is arranged in the receiving cavity. The expander 8222 is installed on the lead screw and at least a part of it extends out of the housing 8221. The expander 8222 is connected to the first actuator 810.

[0124] The housing 8221 can protect the lead screw and the telescopic device 8222 in the accommodation cavity, preventing dust, oil stains, etc. from entering the accommodation cavity and affecting the rotation of the lead screw and the movement of the telescopic device 8222.

[0125] When designing the housing 8221, it can adopt various structural shapes, such as a square structure or a cylindrical structure, etc. There is a gap between the inner wall surface of the housing 8221 and the lead screw, which is convenient for installing the telescopic device 8222 onto the lead screw. In addition, the housing 8221 can adopt a relatively sealed design method. For example, one end of it can be closed, and the other end is left with an opening. After installing the lead screw and the telescopic device 8222 into the accommodation cavity, the end with the opening is then closed through a sealing structure, and the sealing structure can adopt a rubber ring, etc.

[0126] Specifically, please refer to Figure 4 . One end of the opening of the housing 8221 is provided with a sealing cover 823. The sealing cover 823 is one of the above-mentioned sealing structures. The sealing cover 823 can cover the opening end of the housing 8221. The sealing cover 823 forms a through hole in the middle position that can communicate with the accommodation cavity. A sealing ring is designed on the periphery of the through hole. The sealing ring can be made of rubber material. The telescopic device 8222 can extend out from the accommodation cavity and the through hole and be connected to the first actuator 810.

[0127] In some embodiments, please refer to Figure 4 . The telescopic device 8222 can be designed into a columnar structure and surround the outer periphery of the lead screw. When the lead screw rotates, the telescopic device 8222 can achieve a lifting movement in the Z direction.

[0128] As a vertical structural shape, the aforementioned first drive unit 821 and the lead screw mechanism 822 can be directly installed into the base 500. For example, the first drive unit 821 and the lead screw mechanism 822 can be fixedly installed at the bottom of the base 500.

[0129] In some embodiments, please refer to Figure 4 . Between the first drive unit 821 and the lead screw mechanism 822, components such as a speed reducer 824 and a coupling can also be provided, which can improve the connection reliability and the smoothness during motion transmission.

[0130] In the foregoing first type of embodiments, the swing arm opening and closing structure 300 can move integrally in the Z direction. As described above, this first type of embodiment can be applied to the foregoing vertical shaping. At this time, it is relatively easy to arrange and select a specific mechanism type. For example, the lead screw mechanism 822 is arranged in the Z direction, and the pressing structure 200 is arranged in the X direction. It can be understood that in some cases, for example, when the foregoing swing arm opening and closing structure 300 is arranged in a horizontal plane, the first driving structure 800 can also be arranged transversely, that is, this first type of embodiment can also be applied to a horizontal structure.

[0131] In the second type of embodiments, the swing arm 310 includes a free end 311 and a hinged end 312. The swing arm 310 can swing around the hinged end 312, and the free end 311 is movably connected to the pressing structure 200.

[0132] In this second type of embodiment, the swing arm 310 can rotate around the hinged end 312. During its rotation, the position of the free end 311 of the swing arm 310 will change, so that the distance between the free end 311 and the hinged end 312 in the same direction changes, thereby achieving the purpose of driving the pressing structure 200 to move back and forth.

[0133] In the second type of embodiments, the hinged end 312 of the swing arm 310 can be designed to be fixed at a preset position, and the state change of the swing arm 310 is based on the position change of its free end 311. For the swing arm opening and closing structure 300, the number of moving parts is reduced, which can improve the assembly difficulty and also improve the movement smoothness.

[0134] In some embodiments, the swing arm opening and closing structure 300 includes a swing arm seat 320 and a second driving structure (not shown in the figure). The hinged end 312 of the swing arm 310 is connected to the swing arm seat 320. As one of the power input mechanisms, the second driving structure is connected between the swing arm seat 320 and the swing arm 310, and can form a force on the swing arm 310 and drive the swing arm 310 to swing.

[0135] The swing arm seat 320 can refer to the foregoing first type of embodiments and will not be described in detail. The second driving structure can be any power input mechanism that can be connected between the swing arm seat 320 and the swing arm 310, such as a jack, an electric push rod, a cylinder, an oil cylinder, etc. The present application does not limit this.

[0136] In addition to the above, the swing arm opening and closing structure 300 in the embodiments of the present application can also be deformed according to the pressing structure 200. For example, when there are two, three or more pressing structures 200, the number of swing arms 310 in the swing arm opening and closing structure 300 can also be correspondingly set to two, three or more. More swing arms 310 can be designed on the same swing arm seat 320 together.

[0137] The swing arm opening and closing structure 300 can also have other structural forms. For example, the swing arm opening and closing structure 300 can be a shearing mechanism, similar to scissors. The shearing mechanism can include two swing arms 310 that are hinged to each other. The two swing arms 310 are hinged at their middle positions. By controlling the opening and closing movement of the shearing mechanism, the two pressing structures 200 can be pushed to move linearly.

[0138] In some embodiments, please refer to Figure 5 , the pressing structure 200 includes a pressing head 220 and a pressure sensor 230. The pressing head 220 can directly act on the battery housing 10, and the pressure sensor 230 can monitor the magnitude of the force acting on the battery housing 10.

[0139] The pressing head 220 can be designed to be consistent with the end structure of the battery module, so that when the pressing head 220 acts on the battery housing 10, the contact situation between the battery module and the battery housing 10 can be accurately simulated, which is beneficial to improving the reliability of the test results.

[0140] The pressure sensor 230 can be connected between the pressing head 220 and the swing arm 310. That is, one side of the pressure sensor 230 is connected to the pressing head 220, and the other side of the pressure sensor 230 is connected to the swing arm 310. The swing arm 310 drives the pressing head 220 to move through the pressure sensor 230. When the pressing head 220 presses against the battery housing 10, the magnitude of the force applied by the swing arm 310 to the pressing head 220 can be monitored by the pressure sensor 230.

[0141] In some embodiments, please refer to Figure 5 , to protect the pressure sensor 230, the pressing structure 200 can also be configured with a pressing housing 240. The pressure sensor 230 is placed inside the pressing housing 240, and the swing arm 310 can be connected to the pressure sensor 230 provided inside the pressing housing 240.

[0142] In some embodiments, please refer to Figure 5 , the loading structure 100 includes a plurality of mounting blocks 110. The battery housing 10 can be mounted on the mounting blocks 110 and is made to be in a suspended state by the mounting blocks 110.

[0143] The mounting block 110 can adopt a block structure with a certain height. After the battery housing 10 is mounted on the plurality of mounting blocks 110, the battery housing 10 is in a suspended state, which is convenient for the pressing structure 200 to act on the inner side of the battery housing 10, and is also convenient for the setting and layout of the pressing structure 200, the moving guide rail 700, the swing arm 310, etc.

[0144] In some embodiments, please refer to Figure 5, the mounting block 110 is formed with mounting holes 111, and the mounting holes 111 are arranged longitudinally, or the mounting holes 111 are arranged transversely, or the mounting holes 111 are arranged both transversely and longitudinally.

[0145] Please refer to Figure 4 , the transverse direction can be understood as the X direction, the longitudinal direction can be understood as the Y direction, the mounting holes 111 arranged along the X direction can enable battery casings 10 of various different lengths to be mounted on the mounting block 110, and the mounting holes 111 arranged along the Y direction can enable battery casings 10 of various different widths to be mounted on the mounting block 110.

[0146] In some embodiments, please refer to Figure 4 and Figure 5 , the strength testing device further includes a displacement monitoring structure 900, and the displacement monitoring structure 900 is used to monitor and record the displacement amount of the pressing structure 200.

[0147] The displacement monitoring structure 900 combined with the aforementioned pressure sensor 230 can realize the monitoring and recording of the displacement amount and pressure of the pressing structure 200. In the embodiments of the present application, based on the design of the aforementioned swing arm opening and closing structure 300 and the pressing structure 200 and their cooperation mode, the obtained displacement amount value and acting force value are closer to the action of the battery module on the battery casing 10 during charging and discharging, and the test result has high reliability.

[0148] The displacement monitoring structure 900 adopts a laser displacement sensor. For example, relevant components of the laser displacement sensor can be arranged on one side or at one end of the pressing structure 200. These components can include a mounting bracket 910, a receiving end 920, and a transmitting end 930. The transmitting end 930 can be fixedly mounted on the mounting bracket 910 for transmitting laser, and the receiving end 920 can be directly or indirectly connected to the pressing structure 200, so that the receiving end 920 can move along with the movement of the pressing structure 200. Thus, the monitoring of the displacement amount of the pressing structure 200 can be realized through the signal interaction between the receiving end 920 and the transmitting end 930.

[0149] The displacement monitoring structure 900 can also be realized by setting an infrared pair sensor, and its setting method is similar to the above laser displacement sensor, so it will not be elaborated here.

[0150] The displacement monitoring structure 900 can be set in multiple groups, and multiple displacement monitoring structures 900 can be arranged on the same mounting bracket 910. Through the data comparison of multiple groups of displacement monitoring structures 900, a more accurate displacement amount can be obtained.

[0151] It can be understood that when there are multiple pressing structures 200, at least one set of displacement monitoring structures 900 is correspondingly arranged for each pressing structure 200 to monitor the displacement of each pressing structure 200.

[0152] To more clearly understand the structural composition and working principle of the strength testing device in the embodiments of the present application, one or more of the above embodiments will be described below. In the following description, for specific objects, such as the swing arm seat 320, etc., it can be understood according to the structural shape and functional effects in the above embodiments.

[0153] Please refer to Figure 4 and Figure 5 , the strength testing device is designed as a vertical structure, and the strength testing device includes a support plate 600, a loading structure 100, a pressing structure 200, a swing arm opening and closing structure 300, a moving guide rail 700, and a displacement monitoring structure 900. Among them, the loading structure 100 includes a plurality of mounting blocks 110, and the plurality of mounting blocks 110 are all mounted on the support plate 600. The moving guide rail 700 is arranged on the support plate 600, and the pressing structure 200 is mounted on the moving guide rail 700 and can move along the moving guide rail 700. The pressing structure 200 can at least include two pressing units. For example, the pressing structure 200 includes two pressing units, three pressing units or four pressing units. Each pressing unit can act on one side of the battery housing 10 from the inside. Each pressing unit includes a pressure sensor 230 and a pressing head 220. The swing arm opening and closing structure 300 is arranged corresponding to the pressing structure 200, and the number of swing arms 310 is the same as the number of pressing units. The swing arm opening and closing structure 300 includes at least two swing arms 310. The swing arms 310 are respectively connected to the pressing units, that is, each swing arm 310 is correspondingly connected to a pressing unit, so that each swing arm 310 can drive a pressing unit to move. The swing arm opening and closing structure 300 is arranged inside the pressing unit. For example, the swing arms 310 of the swing arm opening and closing structure 300 are arranged in the space surrounded by the pressing units. The displacement monitoring structure 900 is arranged on one side of the pressing unit.

[0154] In the above strength testing device, it should be understood that the pressing unit is the same as the pressing structure 200 in the previous embodiments. There are multiple swing arms 310 designed in the swing arm opening and closing structure 300, such as two swing arms 310. The two swing arms 310 can be simultaneously mounted on the same swing arm seat 320. The structural form of the swing arm seat 320 can refer to the above, or there are minor changes, which will not be elaborated.

[0155] In the above strength testing device, the arrangement that the pressing structure 200 includes at least two pressing units and the swing arm opening and closing structure 300 includes at least two swing arms 310 enables the strength testing device to act on different parts of the battery housing 10. For example, in Figure 4In the illustrated example, the pressing structure 200 includes two pressing units arranged oppositely, and the two pressing units can act on two opposite sides of the battery case 10, so that two opposite parts of the battery case 10 can be tested simultaneously, and the test effect is more accurate.

[0156] Hereinafter, an example will be given in which the pressing structure 200 is provided with two pressing units and the swing arm opening and closing structure 300 is provided with two swing arms 310. For the convenience of understanding and description, the two pressing units are respectively the first pressing unit 201 and the second pressing unit 202, and the two swing arms 310 are respectively the first swing arm 313 and the second swing arm 314. The first swing arm 313 is connected to the first pressing unit 201, and the second swing arm 314 is connected to the second pressing unit 202.

[0157] When testing the battery case 10, the first mode can be adopted: the battery case 10 can be first installed on the mounting block 110, and then the swing arm opening and closing structure 300 is started to make the first swing arm 313 and the second swing arm 314 swing simultaneously. During the swinging process, the first pressing unit 201 and the second pressing unit 202 will gradually approach the battery case 10, and the reading of the pressure sensor 230 during this process is always zero. When the reading of the pressure sensor 230 increases instantaneously, it means that the pressing structure 200 has pressed against the battery case 10. At this time, the displacement monitoring structure 900 starts to work. As the pressing structure 200 further moves towards the battery case 10, the displacement will become larger and larger, and the reading of the pressure sensor 230 will also increase continuously. At the end of the test, when the battery case 10 is damaged, the reading of the pressure sensor 230 also quickly returns to zero. At this time, the swing arm 310 is controlled to stop swinging, and the maximum acting force and the maximum displacement during the whole process are recorded, which are the acting force data and displacement data required during the test. These acting force data and displacement data can be used as a reference to guide the design and development of the battery case 10.

[0158] In the above process, the swing arm 310 is in a continuous action state and can drive the pressing structure 200 to move in the same direction until the battery case 10 is damaged. This first mode is a one-time test mode. In other scenarios, the battery case 10 can also be tested in the second mode.

[0159] Second mode: The battery case 10 can be first installed on the mounting block 110, and then the swing arm opening and closing structure 300 is activated to make the first swing arm 313 and the second swing arm 314 swing simultaneously. During the swinging process, the first pressing unit 201 and the second pressing unit 202 will gradually approach and move away from the battery case 10, and each cyclic movement of the swing arm 310 can be preset. In the first cyclic movement of the swing arm 310, the reading of the pressure sensor 230 will increase from zero, and the moment of increase indicates that the pressing structure 200 has pressed against the battery case 10. At this time, the displacement monitoring structure 900 starts to work. During the process of the swing arm 310 swinging with a preset cyclic movement, the pressing structure 200 will repeatedly approach and move away from the battery case 10 until the battery case 10 is damaged. Multiple sets of data can be continuously recorded during the above process.

[0160] In the above second mode, each cyclic movement of the swing arm 310 symbolizes one charge and discharge of the battery module. The swing arm 310 can act on the battery case 10 during each cyclic movement. By comparing and verifying multiple sets of data, more accurate test results can be obtained.

[0161] In actual application, the same type of battery case 10 can be operated according to the first mode and the second mode respectively, and then through data comparison, more accurate test results and reliability can be obtained.

[0162] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0163] In the description of the present invention, it should be understood that the terms "comprising" and "having" used in this application and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0164] Unless otherwise clearly defined and limited, terms such as "installation", "connection", "linkage", "fixation" etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a direct connection, or an indirect connection through an intermediate medium, and can be the connection inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, terms such as "first", "second" etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features.

[0165] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A strength testing device for a battery casing (8221), characterized in that: include: A loading structure (100) for mounting a battery housing (8221); A pressing structure (200) is configured to be able to press against the battery housing (8221) from the inner side of the battery housing (8221); And a swing arm opening and closing structure (300), comprising a swing arm (310), wherein the swing arm (310) is movably arranged and has an extended state and a retracted state, wherein the swing arm (310) is connected to the pressing structure (200), and during the process of switching between the extended state and the retracted state, the swing arm (310) can at least drive the pressing structure (200) to move back and forth along a straight line.

2. The strength testing device according to claim 1, characterized in that: The swing arm opening and closing structure (300) is configured to be able to move back and forth along a first direction and to open or retract the swing arm (310), and the pressing structure (200) moves back and forth along a second direction.

3. The strength testing device according to claim 2, characterized in that: The first direction and the second direction are perpendicular to each other.

4. The strength testing device according to claim 3, characterized in that: The swing arm opening and closing structure (300) comprises: A swing arm seat (320), wherein the swing arm (310) is movably connected between the swing arm seat (320) and the pressing structure (200), and the swing arm seat (320) is capable of moving along a first direction.

5. The strength testing device according to claim 4, characterized in that: The swing arm seat (320) is provided with a first rotating shaft (321), one end of the swing arm (310) is connected to the first rotating shaft (321), the pressing structure (200) is provided with a second rotating shaft (210), and the other end of the swing arm (310) is connected to the second rotating shaft (210).

6. The strength testing device according to any one of claims 2 to 5, characterized in that: The strength testing device also includes: A first driving structure (800), wherein the swing arm opening and closing structure (300) is connected to an output end of the first driving structure (800), and the swing arm opening and closing structure (300) is driven by the first driving structure (800) to move back and forth along a first direction.

7. The strength testing device according to claim 6, characterized in that: The first driving structure (800) comprises: A first actuator (810), the first actuator (810) being connected to the swing arm opening and closing structure (300); and a first driving module (820), wherein the first driving module (820) is used to drive the first actuator (810) to move back and forth along a first direction.

8. The strength testing device according to claim 7, characterized in that: The first driving module (820) comprises: A first driving unit (821); and a screw mechanism (822), wherein the first driving unit (821) is connected to the screw mechanism (822), the first driving unit (821) is used to drive the screw in the screw mechanism (822) to rotate, and the first actuator (810) is connected to the screw.

9. The strength testing device according to claim 8, characterized in that: The screw mechanism (822) comprises: The housing (8221) has a receiving cavity, and the lead screw is arranged in the receiving cavity; and a telescope (8222), wherein the telescope (8222) is mounted on the lead screw and at least a portion of it extends out of the housing (8221), and the telescope (8222) is connected to the first actuator (810).

10. The strength testing device according to any one of claims 1 to 5, characterized in that: The swing arm (310) comprises a free end (311) and a hinged end (312); the swing arm (310) is capable of swinging around the hinged end (312); and the free end (311) is movably connected to the pressing structure (200).

11. The strength testing device according to claim 10, characterized in that: The swing arm opening and closing structure (300) further comprises: A swing arm seat (320), the hinged end (312) of the swing arm (310) being connected to the swing arm seat (320); and a second driving structure, wherein the second driving structure is connected between the swing arm seat (320) and the swing arm (310), and is capable of exerting a force on the swing arm (310) and driving the swing arm (310) to swing.

12. The strength testing device according to any one of claims 1 to 5, characterized in that: The swing arm (310) comprises a multi-link mechanism.

13. The strength testing device according to claim 1, characterized in that: The pressing structure (200) comprises: A pressure head (220); and a pressure sensor (230), wherein one side of the pressure sensor (230) is connected to the pressure head (220), and the other side of the pressure sensor (230) is connected to the swing arm (310).

14. The strength testing device according to any one of claims 1 to 5, characterized in that: The loading structure (100) comprises: A plurality of mounting blocks (110), wherein the battery housing (8221) can be mounted on the mounting blocks (110) and supported by the mounting blocks (110) in a suspended state.

15. The strength testing device according to claim 14, characterized in that: The mounting block (110) is formed with mounting holes (111), and the mounting holes (111) are arranged in a longitudinal direction and / or a transverse direction.

16. The strength testing device according to any one of claims 1 to 5, characterized in that: The pressing structure (200) comprises at least two pressing units, and the swing arm opening and closing structure (300) comprises at least two swing arms (310), and the swing arms (310) are respectively connected to the pressing units.

17. The strength testing device according to claim 16, characterized in that: The pressing structure (200) comprises a first pressing unit (201) and a second pressing unit (202); the swing arm opening and closing structure (300) comprises a first swing arm (313) and a second swing arm (314); the first swing arm (313) is connected to the first pressing unit (201); and the second swing arm (314) is connected to the second pressing unit (202).

18. The strength testing device according to claim 17, characterized in that: The first pressing unit (201) and the second pressing unit (202) are arranged opposite to each other, and the first swing arm (313) and the second swing arm (314) are arranged opposite to each other.

19. The strength testing device according to any one of claims 1 to 5, characterized in that: The strength testing device also includes: A movable guide rail (700), wherein the pressing structure (200) is arranged on the movable guide rail (700) and is capable of moving along the movable guide rail (700).

20. The strength testing device according to any one of claims 1 to 5, characterized in that: The strength testing device also includes: A displacement monitoring structure (900), wherein the displacement monitoring structure (900) is used to monitor and record the displacement of the pressing structure (200).

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