Test equipment and battery test methods

Abstract

The present application discloses a testing device and a battery testing method. The testing device of the embodiment of the present application is used to test the torsional strength of the battery, and includes a base, an adjusting device, a bracket and at least one force-applying device. The adjusting device is arranged on the base, and the bracket is installed on the adjusting device. The adjusting device is used to drive the bracket to move along the first direction and the second direction; the force-applying device is installed on the bracket, and the force-applying device is used to connect with the battery and apply a force along the third direction to the battery, and the first direction, the second direction and the third direction are perpendicular to each other. In the torsional strength testing device of the embodiment of the present application, the bracket is driven to move along the first direction and the second direction by the adjusting device, and the force-applying device is carried by the bracket, so that the force-applying device can move over a large range along the first direction and the second direction, thereby effectively expanding the battery size range applicable to the torsional strength testing device and improving the compatibility of the same device with different batteries.

Description

Technical Field

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

[0002] In a battery-powered car, the battery is easily twisted by pressure in different directions as the car is driven, causing the power battery to deform or even fail. Battery torsional strength testing equipment can detect the torsional strength of the battery by applying force in a certain direction to the battery. However, the torsional strength testing equipment in the related art has poor compatibility with battery size. Summary of the invention

[0003] In view of the above problems, the present application provides a testing device and a battery testing method, and is at least used to improve the compatibility of the testing device with the battery size.

[0004] In a first aspect, the present application provides a testing device for testing the torsional strength of a battery.

[0005] The testing equipment of the embodiment of the present application includes a base, an adjusting device, a bracket and at least one force-applying device, wherein: the adjusting device is arranged on the base, the bracket is installed on the adjusting device, the adjusting device is used to drive the bracket to move along the first direction and the second direction; the force-applying device is installed on the bracket, the force-applying device is used to connect with the battery and apply a force along the third direction to the battery, and the first direction, the second direction and the third direction are perpendicular to each other.

[0006] In the torsional strength testing device of the embodiment of the present application, the bracket is driven to move along the first direction and the second direction by the adjusting device, and the force-applying device is carried by the bracket, so that the force-applying device can move over a large range along the first direction and the second direction, thereby effectively expanding the battery size range applicable to the torsional strength testing device and improving the compatibility of the same device with different batteries.

[0007] In some embodiments, the adjustment device includes a first adjustment mechanism and a second adjustment mechanism disposed on the first adjustment mechanism, the first adjustment mechanism is disposed on the base and is used to drive the second adjustment mechanism to move along a first direction to drive the bracket to move along the first direction, and the second adjustment mechanism is used to drive the bracket to move along the second direction.

[0008] In this way, the first adjustment mechanism drives the second adjustment mechanism to move in the first direction, and the second adjustment mechanism drives the bracket to move in the second direction, so that the bracket has freedom of movement in the first direction and the second direction, so that the force-applying device can move with the bracket to match the battery size in the first direction and the second direction.

[0009] In some embodiments, the first adjustment mechanism includes a first slide rail and a first slider slidably disposed on the first slide rail, the first slide rail extends along a first direction, and the second adjustment mechanism is fixed on the first slider.

[0010] In this way, through the cooperation between the first slide rail and the first slider, the first adjustment mechanism can limit the second adjustment mechanism and the bracket from moving along the first direction, thereby stably and conveniently adjusting the position of the force applying device in the first direction.

[0011] In some embodiments, the second adjustment mechanism includes a mounting plate, a second slide rail, and a second slider slidably disposed on the second slide rail, the second slide rail is disposed on the mounting plate and extends along the second direction, and the bracket is fixed on the second slider.

[0012] In this way, through the cooperation between the second slide rail and the first slide rail, the second adjustment mechanism can limit the movement of the bracket along the second direction, thereby stably and conveniently adjusting the position of the force applying device in the second direction.

[0013] In some embodiments, the adjusting device includes a first driving assembly, which is mounted on the base and connected to the mounting plate, and the first driving assembly is used to drive the mounting plate to move so that the second adjusting mechanism moves along the first direction.

[0014] In this way, the first driving assembly drives the mounting plate to move in the second direction, and the positions of the second adjusting mechanism and the bracket in the first direction are adjusted to accommodate different sizes of batteries in the second direction.

[0015] In some embodiments, the adjusting device includes a second driving assembly, the second driving assembly is mounted on the mounting plate, the second driving assembly is connected to the bracket, and the second driving assembly is used to drive the bracket to move along the second direction.

[0016] In this way, the bracket is driven to move relative to the mounting plate along the second direction by the second driving assembly, and the position of the bracket on the second slide rail is adjusted to be compatible with different sizes of batteries in the second direction.

[0017] In some embodiments, a reinforcement structure is provided on a side of the mounting plate facing the base.

[0018] In this way, by providing a reinforcing structure on the side of the mounting plate facing the base, the strength of the second adjustment mechanism is increased, so that the second slide rail remains straight, thereby ensuring the overall stability and adjustment accuracy of the adjustment device.

[0019] In some embodiments, the number of the first slide rails is at least two, the at least two first slide rails are arranged in parallel and at intervals along the second direction, and the mounting plate is mounted on the at least two first slide rails.

[0020] In this way, by at least two first slide rails arranged in parallel and at intervals along the second direction, the mounting plate is mounted on the first slide rails arranged in parallel and at intervals along the first direction, thereby increasing the flatness and stability of the mounting plate.

[0021] In some embodiments, the force applying device includes a locking member, which is located at an end of the force applying device along the third direction, and is used to connect with the battery.

[0022] In this way, by providing a locking piece at the end of the force applying device in the third direction to connect with the battery, it is ensured that the force applying device is stably connected to the battery during the test and keeps applying force in the third direction to the battery.

[0023] In some embodiments, the force applying device includes a movable component connected to the locking member, and the movable component is used to compensate for the displacement of the locking member along the first direction and / or the second direction when the force applying device drives the battery to move along the third direction.

[0024] In this way, the movable assembly compensates for the displacement of the locking member along the first direction and / or the second direction when the force applying device applies force to the battery, thereby avoiding excessive deformation of the force applying device during the test and protecting the test equipment.

[0025] In some embodiments, the movable component includes a fixed part and a movable part movably connected to the fixed part through a spherical joint, the movable part is fixedly connected to the locking part, and the movable part is used to compensate for the displacement of the locking part along the first direction and / or the second direction when the locking part moves along the third direction.

[0026] In this way, the fixed part and the movable part in the movable assembly are movably linked by a spherical pair, and the movable part is fixedly connected to the locking part, so that the movable part can drive the locking part to move relative to the fixed part along the first direction and the second direction, thereby compensating for the displacement of the locking part and the battery in the first direction and / or the second direction.

[0027] In some embodiments, the fixing member is sleeved on the outside of the movable member, and the movable member is sleeved on an end of the locking member away from the battery.

[0028] In this way, the fixed part is sleeved outside the movable part, and the movable part is sleeved on the locking part, so that the force-applying device has a compact structure, thereby saving space. In addition, such a design is conducive to keeping the fixed part, the movable part and the locking part coaxial, ensuring the consistency of the force applied by the force-applying device with the displacement direction of the battery.

[0029] In some embodiments, the force applying device includes an actuating mechanism and a connecting assembly, the connecting assembly is connected to the fixing member, the actuating mechanism is mounted on the bracket and connected to the connecting assembly, and the actuating mechanism is used to provide a force in a third direction to the battery through the connecting assembly and the locking member.

[0030] In this way, by connecting the actuating mechanism to the connecting assembly, connecting the connecting assembly to the fixing member, and fixing member to the locking member, the actuating mechanism can control the force applying device to apply a force in the third direction to the battery.

[0031] In some embodiments, the connection assembly includes a connection seat and a bearing sleeve connected to the connection seat, the fixing member is fixedly disposed in the bearing sleeve, and the connection seat is connected to the actuating mechanism.

[0032] In this way, the connecting seat is connected to the bearing sleeve and the actuating mechanism, and the fixing member is fixedly arranged in the bearing sleeve, so as to maintain a stable connection between the actuating mechanism, the connecting assembly and the fixing member, and the actuating mechanism can stably apply force to the battery through the fixing member and the connecting assembly.

[0033] In some embodiments, the force applying device includes a pressure sensor, which is connected to the connecting seat and the bearing sleeve and is used to detect the force applied by the actuating mechanism to the battery.

[0034] In this way, the connecting seat and the bearing sleeve are connected through the pressure sensor, so as to detect the force applied by the actuating mechanism to the connecting assembly in real time, and then confirm the stress state of the battery during the test process.

[0035] In some embodiments, the force applying device includes an elastic component, which connects the movable member and the connecting seat and is used to apply an elastic force along the third direction to the movable member.

[0036] In this way, the movable part and the connecting seat are connected by the elastic component, and an elastic force along the third direction is applied to the movable part, so that after the test is completed and the force applying device removes the force on the battery, the force applying device can be automatically reset.

[0037] In some embodiments, the force applying device includes a third slide rail and a third slider slidably connected to the third slide rail, the third slide rail is connected to the bracket and extends along the third direction, and the third slider is connected to the connecting seat.

[0038] In this way, the third slide rail and the third slider cooperate, the third slide rail is connected to the bracket and extends along the third direction, and the third slider is connected to the connecting seat, thereby limiting the displacement of the force applying device along the third direction when applying force to the battery.

[0039] In some embodiments, there are multiple force applying devices, and the multiple force applying devices are distributed at intervals.

[0040] In this way, by distributing a plurality of force-applying devices at intervals, the force applied by the force-applying devices to the battery can simulate the actual force conditions of the battery under driving conditions, thereby increasing the reliability of the test results.

[0041] In some embodiments, the testing device further includes a supporting platform, which is disposed on the base, and the adjusting device and the bracket are distributed on one side of the supporting platform, and the supporting platform is used to place the battery.

[0042] In this way, the support platform is set on the base, and the adjustment device and the bracket are distributed on one side of the support platform. Therefore, when the battery to be tested is placed on the support platform, the adjustment device can adjust the force application point of the force application device on the battery according to the actual size of the battery. The operation is convenient and the force application position is more accurate.

[0043] In a second aspect, the present application provides a battery testing method, which is implemented using the testing device of any of the above embodiments.

[0044] The battery testing method of the embodiment of the present application comprises the following steps:

[0045] Controlling the force applying device to apply force to the battery;

[0046] Obtain the displacement data of the battery;

[0047] Obtaining the force applied by the force applying device to the battery;

[0048] The torsional strength test result of the battery is determined based on the corresponding relationship between the displacement data and the applied force.

[0049] The battery testing method provided in the second aspect of the present application is implemented using the testing equipment proposed in the first aspect of the present application, and therefore has all the beneficial effects of the testing equipment, has higher test reliability, and has better compatibility with batteries of different sizes.

[0050] In some embodiments, the battery testing method further comprises:

[0051] Obtain the magnitude and direction of the force acting on the battery under driving conditions;

[0052] Control the force applying device to apply a force to the battery of the same magnitude and direction as that under driving conditions;

[0053] Get the decibel of noise generated by the battery;

[0054] The torsional strength test results of the battery are determined based on the decibels of noise generated by the battery.

[0055] In this way, by obtaining the stress conditions of the battery under driving conditions and controlling the force-applying device to apply the same magnitude and direction of force to the battery as under driving conditions, the driving conditions are simulated for testing to ensure the reliability of the test results. By obtaining the noise decibels generated by the battery during the test and determining the test results based on the noise decibels, it is ensured that the battery does not cause noise interference under driving conditions.

[0056] In some embodiments, determining the torsional strength test result of the battery according to the decibel of noise generated by the battery includes:

[0057] If the noise decibel generated by the battery is higher than the preset decibel, it is determined that the battery fails the torsional strength test;

[0058] If the noise decibel generated by the battery is less than or equal to the preset decibel, it is determined that the torsional strength test of the battery has passed.

[0059] In this way, when the noise decibel generated by the battery is higher than the preset decibel, it is determined that the battery's torsional strength test has failed. When the noise decibel generated by the battery is less than or equal to the preset decibel, it is determined that the battery's torsional strength test has passed, ensuring that the noise generated by the battery during actual driving is lower than the noise standard recognized by the human ear, thereby improving the driving experience.

[0060] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0062] Figure 1 is a schematic structural diagram of a vehicle provided in an embodiment of the present application;

[0063] Figure 2 is a schematic diagram of the structure of a battery provided in an embodiment of the present application;

[0064] Figure 3 is a schematic diagram of the exploded structure of a battery cell provided in an embodiment of the present application;

[0065] Figure 4 It is a schematic diagram of the structure of the test equipment provided in the embodiment of the present application;

[0066] Figure 5 It is a schematic diagram of the structure of the test device provided in the embodiment of the present application from a top view;

[0067] Figure 6 It is a schematic diagram of the structure of the test device provided in the embodiment of the present application at a front view angle;

[0068] Figure 7is a schematic diagram of the exploded structure of the test device provided in the embodiment of the present application;

[0069] Figure 8 is a schematic diagram of the combination of the adjustment device and the bracket provided in the embodiment of the present application;

[0070] Fig. 9 is a schematic structural diagram of a force applying device provided in an embodiment of the present application;

[0071] Fig.10 is a schematic diagram of the exploded structure of the force applying device provided in the embodiment of the present application;

[0072] Fig.11 is a flow chart of a battery testing method provided in an embodiment of the present application;

[0073] Fig.12 is a flow chart of a battery testing method provided by another embodiment of the present application;

[0074] Fig.13 This is a flow chart of a battery testing method provided in yet another embodiment of the present application.

[0075] Description of main component symbols:

[0076] Vehicle 1000, battery cell 100, housing 10, battery cell assembly 20, main body 21, tab 22, battery end cap 30, battery 200, motor 300, controller 400, housing 210, first portion 211, second portion 212;

[0077] Testing device 2000, base 40, upper surface 401, bracket 60, first support plate 61, second support plate 62, third support plate 63, support platform 80, support seat 81, support plate 82, guide groove 83, third driving assembly 84;

[0078] Adjustment device 50, first adjustment mechanism 51, first slide rail 511, first slider 512, second adjustment mechanism 52, second slide rail 521, second slider 522, mounting plate 523, reinforcement structure 5231, first drive assembly 53, first handle 531, first screw rod 532, second drive assembly 54, second handle 541, second screw rod 542;

[0079] The force-applying device 70, the locking member 71, the movable assembly 72, the fixing member 721, the nut 7211, the movable member 722, the ball bearing 7222, the actuating mechanism 73, the motor 731, the connecting assembly 74, the connecting seat 741, the connecting frame 7411, the connecting sleeve 7412, the bearing sleeve 742, the pressure sensor 75, the elastic assembly 76, the tension spring 761, the tension spring seat 762, the third slide rail 781, and the third slide block 782. DETAILED DESCRIPTION

[0080] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0081] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0082] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0083] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0084] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0085] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0086] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0087] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0088] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries can not only be used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as mobile communication equipment, smart wearables, aerospace and other fields. With the diversification of usage scenarios and the growth of market demand, the requirements for battery quality are also increasing.

[0089] The battery can be a power battery used to provide driving power for new energy vehicles, electric bicycles, electric trains and other transportation vehicles. During the terrain passability test of new energy vehicles, some vehicles that use batteries to provide driving power experienced abnormal battery noise. It has been confirmed that these vehicles experienced abnormal noises due to the deformation of the battery end cap caused by the torsional force under the twisting road test.

[0090] To this end, it is necessary to test the torsional strength of power batteries to ensure that vehicles using power batteries pass the test normally. In related technologies, the test equipment used to test the torsional strength of batteries is composed of a module in a fixed position to constrain the battery to be tested, and applies pressure to the battery at a fixed position for testing. Power batteries are widely used and rich in variety. The product specifications vary greatly, and the size range of battery end covers is relatively wide. However, the above scheme has limited compatibility with battery size. When the battery size varies greatly, multiple sets of equipment are required for testing, which has high design and manufacturing costs and is prone to idle resources.

[0091] Based on the above considerations, in order to solve the problem of poor compatibility of battery torsional strength test equipment with battery size, the present application provides a test equipment, which is installed on a bracket through a force-applying device and driven by an adjustment device to move the bracket and the force-applying device, so that the position where the force-applying device applies pressure to the battery matches the different sizes of the battery to be tested. Such a test equipment is also conducive to simulating the actual stress state of the battery under vehicle driving conditions and enhancing the reliability of the test results.

[0092] A battery can be composed of one or more battery cells. A battery cell generally includes a housing, a battery cell assembly, and a pole. The battery cell assembly includes a main body that generates electrical energy and a pole ear that is electrically connected to the main body. The pole is usually set on the housing and connected to the main body through the pole ear to conduct electrical energy. A battery cell can be used in an electrical device that uses the battery as a power source.

[0093] The electrical device may be, but is not limited to, a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. Among them, the spacecraft may be an airplane, a rocket, a space shuttle, a spacecraft, and the like, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0094] Please refer to Figure 1 For the convenience of explanation, the electric power consumption device of one embodiment of the present application is described as a vehicle 1000. Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 200 is provided inside the vehicle 1000, and the battery 200 may be provided at the bottom, head or tail of the vehicle 1000. The battery 200 may be used to power the vehicle 1000, and the battery 200 may be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000. The vehicle 1000 may also include a controller 400 and a motor 300, and the controller 400 is used to control the battery 200 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0095] Please refer to Figure 2 , Figure 2The schematic diagram of the structure of the battery 200 provided in some embodiments of the present application shows the structure of the battery 200 decomposed in the figure. The battery 200 includes a box 210 and a battery cell 100, and the battery cell 100 is contained in the box 210. The box 210 is used to provide a storage space for the battery cell 100, and the box 210 can adopt a variety of structures. In some embodiments, the box 210 may include a first part 211 and a second part 212, and the first part 211 and the second part 212 cover each other, and the first part 211 and the second part 212 jointly define a storage space for accommodating the battery cell 100. The second part 212 may be a hollow structure with one end open, and the first part 211 may be a plate-like structure, and the first part 211 covers the open side of the second part 212, so that the first part 211 and the second part 212 jointly define a storage space; the first part 211 and the second part 212 may also be hollow structures with one side open, and the open side of the first part 211 covers the open side of the second part 212. Of course, the box body 210 formed by the first part 211 and the second part 212 can be in various shapes, such as a cylinder, a cuboid, etc.

[0096] In the battery 200, there may be multiple battery cells 100, and the multiple battery cells 100 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 100 are both connected in series and in parallel. The multiple battery cells 100 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 100 is accommodated in the box 210; of course, the battery 200 may also be a battery module formed by connecting multiple battery cells 100 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 210. The battery 200 may also include other structures, for example, the battery 200 may also include a busbar component for realizing electrical connection between the multiple battery cells 100.

[0097] Each battery cell 100 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 100 may be cylindrical, flat, rectangular, or in other shapes.

[0098] See also Figure 3 , Figure 3 The schematic diagram of the decomposition structure of a battery cell provided in some embodiments of the present application. The battery cell 100 refers to the smallest unit that constitutes the battery 200. Figure 3 The battery cell 100 includes a housing 10, a battery cell assembly 20, a battery end cover 30 and other functional components.

[0099] The battery end cap 30 refers to a component that covers the opening of the shell 10 to isolate the internal environment of the battery cell 100 from the external environment. Without limitation, the shape of the battery end cap 30 can be adapted to the shape of the shell 10 to match the shell 10. Optionally, the battery end cap 30 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the battery end cap 30 is not easy to deform when it is squeezed and collided, so that the battery cell 100 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals can be provided on the battery end cap 30. The electrode terminal can be used to electrically connect with the battery cell assembly 20 to output or input the electrical energy of the battery cell 100. In some embodiments, the battery end cap 30 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. The material of the battery end cap 30 can also be a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this. In some embodiments, an insulating member may be provided inside the battery end cover 30, and the insulating member may be used to isolate the electrical connection components in the housing 10 from the battery end cover 30 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, etc.

[0100] The housing 10 is a component used to cooperate with the battery end cover 30 to form the internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the battery cell assembly 20, electrolyte and other components. The housing 10 and the battery end cover 30 can be independent components, and an opening can be set on the housing 10, and the internal environment of the battery cell 100 is formed by covering the opening with the battery end cover 30 at the opening. Without limitation, the battery end cover 30 and the housing 10 can also be integrated. Specifically, the battery end cover 30 and the housing 10 can form a common connection surface before other components are put into the shell, and when the interior of the housing 10 needs to be encapsulated, the battery end cover 30 is covered with the housing 10. The housing 10 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the housing 10 can be determined according to the specific shape and size of the battery cell assembly 20. The material of the housing 10 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0101] The battery cell assembly 20 is a component in the battery cell 100 where electrochemical reactions occur. One or more battery cell assemblies 20 may be included in the housing 10. The battery cell assembly 20 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body 21 of the battery cell assembly 20, and the parts of the positive and negative electrode sheets without active materials each constitute a tab 22. The positive tab and the negative tab may be located together at one end of the main body 21 or respectively at both ends of the main body 21. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the tab 22 connects the electrode terminals to form a current loop.

[0102] According to some embodiments of this application, please refer to Figure 4 , and please refer to Figure 4-Figure 7 , Figure 4 is a schematic diagram of the structure of the test device 2000 according to an embodiment of the present application, Figure 7 yes Figure 4 Schematic diagram of the exploded structure of the test device 2000. The test device 2000 of the embodiment of the present application includes a base 40, an adjustment device 50, a bracket 60 and at least one force-applying device 70, wherein: the adjustment device 50 is arranged on the base 40, the bracket 60 is installed on the adjustment device 50, the adjustment device 50 is used to drive the bracket 60 to move along the first direction and the second direction; the force-applying device 70 is installed on the bracket 60, the force-applying device 70 is connected to the battery 200 and applies a force along the third direction to the battery 200, and the first direction, the second direction and the third direction are perpendicular to each other.

[0103] As shown in the figure, the X direction is the first direction, the Y direction is the second direction, and the Z direction is the third direction.

[0104] Specifically, the base 40 is located at the bottom of the test device 2000. The base 40 may be square, and the four sides of the base 40 may form a solid beam, column or platform to place the adjustment device 50. The geometric center area of ​​the base 40 may be a solid flat plate structure, or may be a plurality of beams or columns connecting the four sides of the base 40 to improve the overall strength of the base 40. The base 40 may be made of hard metal, such as steel, so as to ensure that the rigidity of the base 40 is high and improve the bearing capacity and stability of the test device 2000.

[0105] The upper surfaces 401 of the multiple beams or columns constituting the base 40 are maintained in the same horizontal plane. The adjusting device 50 is installed on the upper surface 401, and the adjusting device 50 can drive the bracket 60 to move horizontally along the upper surface 401. The first direction and the second direction can be two directions parallel to the upper surface 401 and perpendicular to each other, and the third direction is a vertical direction perpendicular to the horizontal plane.

[0106] The bracket 60 may include a first support plate 61, a second support plate 62 and a third support plate 63. The first support plate 61 and the second support plate 62 may both be square plate structures, and one side of the first support plate 61 and one side of the second support plate 62 may be connected together. The third support plate 63 may be a triangular plate structure and connect the first support plate 61 and the second support plate 62 to enhance the structural stability of the bracket 60. The first support plate 61 is connected to the adjustment device 50 and may be arranged parallel to the upper surface 401. The second support plate 62 may form a certain angle with the first support plate 61, for example, the second support plate 62 may be 90° with the second support plate 62 and be arranged vertically along the third direction.

[0107] The force applying device 70 corresponds to the bracket 60 one by one, and each bracket 60 is provided with a force applying device 70. A through hole can be formed on the first support plate 61, and the force applying device 70 is penetrated in the through hole along the third direction to save installation space and facilitate the application of force to the battery 200 to be tested. The force applying device 70 is slidably connected to the second support plate 62, so that the force applying device 70 can move relative to the bracket 60 when applying force to the battery 200.

[0108] In the torsional strength testing device 2000 of the embodiment of the present application, the bracket 60 is driven to move along the first direction and the second direction by the adjusting device 50, and the force-applying device 70 is carried by the bracket 60, so that the force-applying device 70 can move over a large range along the first direction and the second direction, thereby effectively expanding the size range of the battery 200 applicable to the torsional strength testing device 2000 and improving the compatibility of the same device with different batteries 200.

[0109] See also Figure 4-Figure 7 In some embodiments, the adjusting device 50 includes a first adjusting mechanism 51 and a second adjusting mechanism 52 disposed on the first adjusting mechanism 51. The first adjusting mechanism 51 is disposed on the base 40 and is used to drive the second adjusting mechanism 52 to move along the first direction to drive the bracket 60 to move along the first direction. The second adjusting mechanism 52 is used to drive the bracket 60 to move along the second direction.

[0110] Specifically, the first adjustment mechanism 51 is fixedly mounted on the base 40, and the first adjustment mechanism 51 at least partially extends along the first direction. The second adjustment mechanism 52 is stacked on the first adjustment mechanism 51, and the second adjustment mechanism 52 at least partially extends along the second direction. The first adjustment mechanism 51 and the second adjustment mechanism 52 are overlapped on the base 40, and the first adjustment mechanism 51 can be fixedly connected with the second adjustment mechanism 52 by fasteners such as bolts.

[0111] The first adjusting mechanism 51 can limit the movement of the second adjusting mechanism 52 along the first direction through structures such as slide rails, slide grooves, and conveyor belts. The second adjusting mechanism 52 can also limit the movement of the bracket 60 along the second direction through structures such as slide rails, slide grooves, and conveyor belts.

[0112] The first adjustment mechanism 51 and the second adjustment mechanism 52 can jointly adjust the positions of the bracket 60 and the force-applying device 70 on the bracket 60 in the first direction and the second direction, so that the position of the force-applying device 70 and the force-applying point of the battery 200 to be applied are matched with the size of the battery 200 to be tested. The adjustment range of the first adjustment mechanism 51 and the second adjustment mechanism 52 should not be less than the size variation range of the battery 200 to be tested. For example, the length range of the square battery 200 can reach 145mm~310mm, the width range can reach 25mm~95mm, the difference between the maximum length and the minimum length of the square battery 200 is 165mm, and the difference between the maximum width and the minimum width of the square battery 200 is 70mm. Accordingly, the wide side of the square battery 200 is arranged along the first direction and the long side is arranged along the second direction, then the first adjustment mechanism 51 drives the second adjustment mechanism 52 to move in the first direction in a range greater than or equal to 70mm, and the second adjustment mechanism 52 drives the bracket 60 to move in the second direction in a distance range greater than or equal to 165mm.

[0113] In this way, the first adjustment mechanism 51 drives the second adjustment mechanism 52 to move in the first direction, and the second adjustment mechanism 52 drives the bracket 60 to move in the second direction, so that the bracket 60 has freedom of movement in the first direction and the second direction, so that the force-applying device 70 can move with the bracket 60 to match the size of the battery 200 in the first direction and the second direction.

[0114] See also Figure 4 and Figure 8 In some embodiments, the first adjustment mechanism 51 includes a first slide rail 511 and a first slider 512 slidably disposed on the first slide rail 511 , the first slide rail 511 extends along a first direction, and the second adjustment mechanism 52 is fixed on the first slider 512 .

[0115] Specifically, the first slide rail 511 is fixed on the base 40, and the first slide rail 511 and the base 40 can be fixedly connected using fasteners such as bolts. The first slide rail 511 can be a linear slide rail, and the first slider 512 can slide on the first slide rail 511 along the extension direction of the first slide rail 511, that is, the first direction. The side of the first slider 512 facing away from the first slide rail 511 is fixedly connected to the mounting plate 523. The mounting plate 523, the second slide rail 521 disposed on the mounting plate 523, the second slider 522, the bracket 60, and the force applying device 70 disposed on the bracket 60 can move synchronously with the first slider 512 in the first direction.

[0116] In this way, through the cooperation between the first slide rail 511 and the first slider 512 , the first adjustment mechanism 51 can limit the second adjustment mechanism 52 and the bracket 60 from moving along the first direction, thereby stably and conveniently adjusting the position of the force applying device 70 in the first direction.

[0117] See also Figure 4 and Figure 8 , Figure 8 Schematic diagram of the combination of the adjustment device 50 and the bracket 60 of the embodiment of the present application. In some embodiments, the second adjustment mechanism 52 includes a mounting plate 523, a second slide rail 521 and a second slider 522 slidably disposed on the second slide rail 521, the second slide rail 521 is disposed on the mounting plate 523 and extends along the second direction, and the bracket 60 is fixed on the second slider 522.

[0118] Specifically, the mounting plate 523 may be a rectangular plate-shaped structure, the long side of the mounting plate 523 may be arranged along the second direction, and the wide side of the mounting plate 523 may be arranged along the first direction. The side of the mounting plate 523 facing the base 40 is fixedly connected to the first slider 512, and multiple first sliders 512 may be connected to the four corners or ends of the wide side of the mounting plate 523. The mounting plate 523 may be mounted on two first slide rails 511 that are parallel and spaced apart.

[0119] The second slide rail 521 may be a linear slide rail, fixedly mounted on a side of the mounting plate 523 away from the base 40 and the first slide rail 511. The second slide rail 521 overlaps with the first slide rail 511, and the end of the second slide rail 521 in the second direction may overlap with the first slide rail 511. At the overlap of the second slide rail 521 and the first slide rail 511, the first slide rail 511, the first slider 512, the mounting plate 523 and the second slide rail 521 are sequentially stacked from bottom to top, and may be reinforced and connected by fasteners such as bolts.

[0120] The second slider 522 is disposed on a side of the second slide rail 521 away from the mounting plate 523. The second slider 522 is engaged with the second slide rail 521 and can slide along the extension direction of the second slide rail 521, that is, the second direction. A side of the second slider 522 away from the second slide rail 521 is fixedly connected to the bracket 60, and the bracket 60 can move synchronously with the second slider 522 along the second direction.

[0121] In this way, by cooperating between the second slide rail 521 and the first slide rail 511 , the second adjustment mechanism 52 can limit the movement of the bracket 60 along the second direction, thereby stably and conveniently adjusting the position of the force applying device 70 in the second direction.

[0122] See also Figure 4 and Figure 5In some embodiments, the adjusting device 50 includes a first driving assembly 53, which is mounted on the base 40 and connected to the mounting plate 523, and the first driving assembly 53 is used to drive the mounting plate 523 to move so that the second adjusting mechanism 52 moves along the first direction.

[0123] Specifically, the first drive assembly 53 includes a first handle 531 and a first screw rod 532. The first handle 531 is fixedly connected to the base 40, and can be arranged on two sides of the four sides of the base 40 adjacent to the first slide rail 511. The first handle 531 can drive the first screw rod 532 to rotate when a force is applied by the user. The first screw rod 532 extends linearly along the first direction, connecting the first handle 531 and the mounting plate 523. In other words, the first screw rod 532 is arranged parallel to the first slide rail 511. When the first screw rod 532 rotates, it drives the mounting plate 523 to move along the first screw rod 532, so that the second slide rail 521, the second slider 522, the bracket 60 and the force-applying device 70 on the bracket 60 on the mounting plate 523 move along the first direction.

[0124] In another example, the first driving assembly 53 can drive the screw rod or the rotating shaft to rotate through the motor 731, thereby driving the mounting plate 523 to move along the first direction, so that the user can save effort when adjusting the position of the force applying device 70 in the first direction.

[0125] In some embodiments, there are multiple first drive assemblies 53, and some of the first drive assemblies 53 may be connected to the same mounting plate 523. The multiple first drive assemblies 53 connected to the same mounting plate 523 may be arranged in parallel with each other.

[0126] In this way, the first driving assembly 53 drives the mounting plate 523 to move along the second direction, and adjusts the positions of the second adjustment mechanism 52 and the bracket 60 in the first direction, so as to accommodate different sizes of the battery 200 in the second direction.

[0127] See also Figure 4 and Figure 7 In some embodiments, the adjusting device 50 includes a second driving assembly 54, the second driving assembly 54 is mounted on the mounting plate 523, the second driving assembly 54 is connected to the bracket 60, and the second driving assembly 54 is used to drive the bracket 60 to move along the second direction.

[0128] Specifically, it includes a second handle 541 and a second screw rod 542. The second handle 541 is fixedly connected to the mounting plate 523, and can be arranged on two sides of the mounting plate 523 that are adjacent to the second slide rail 521. The second handle 541 can drive the second screw rod 542 to rotate when a force is applied by the user. The second screw rod 542 extends linearly along the second direction, connecting the second handle 541 and the bracket 60, or in other words, the second screw rod 542 is arranged parallel to the second slide rail 521. When the second screw rod 542 rotates, it drives the bracket 60 to move along the second screw rod 542, so that the force-applying device 70 on the bracket 60 moves along the second direction.

[0129] In another two examples, the second driving assembly 54 can drive the screw rod or the rotating shaft to rotate through the motor 731, thereby driving the mounting plate 523 to move along the second direction, so that the user can save more effort when adjusting the position of the force applying device 70 in the second direction.

[0130] In this way, the second driving assembly 54 drives the bracket 60 to move relative to the mounting plate 523 along the second direction, and adjusts the position of the bracket 60 on the second slide rail 521 to accommodate different sizes of the battery 200 in the second direction.

[0131] See also Figure 6-Figure 8 In some embodiments, a reinforcing structure 5231 is provided on one side of the mounting plate 523 facing the base 40 .

[0132] Specifically, the mounting plate 523 is mounted on at least two first slide rails 511 disposed at intervals, and the mounting plate 523 is suspended between the first slide rails 511. The reinforcing structure 5231 is disposed at the suspended portion of the mounting plate 523, and the reinforcing structure 5231 may be formed by gradually increasing thickness from the connection between the mounting plate 523 and the first slide rail 511 to the middle of the mounting plate 523 in the second direction, and the reinforcing structure 5231 may be in an arch shape protruding toward the base 40.

[0133] In this way, by providing a reinforcing structure 5231 on the side of the mounting plate 523 facing the base 40, the strength of the second adjustment mechanism 52 is increased, so that the second slide rail 521 remains straight, thereby ensuring the overall stability and adjustment accuracy of the adjustment device 50. In addition, the reinforcing structure 5231 is provided on the side of the mounting plate 523 away from the second slide rail 521 to avoid interfering with the movement of the bracket 60.

[0134] See also Figure 5 and Figure 8 In some embodiments, the number of the first slide rails 511 is at least two, at least two first slide rails 511 are arranged in parallel and at intervals along the second direction, and the mounting plate 523 is mounted on the at least two first slide rails 511 .

[0135] Specifically, the number of the first slide rails 511 may be two, three, four, six, eight, etc. Exemplarily, the number of the first slide rails 511 is two, and the two first slide rails 511 are arranged in parallel and spaced apart along the second direction, and may be arranged on two opposite sides of the base 40 along the second direction. The mounting plate 523 may be mounted on the two first slide rails 511.

[0136] In another example, the number of the first slide rails 511 is four, and the four first slide rails 511 can be divided into two groups, and the two first slide rails 511 in the same group are arranged on the same side of the support platform 80 in the first direction. The first slide rails 511 on the same side of the support platform 80 are arranged opposite to each other along the second direction. In this embodiment, the number of the mounting plates 523 is two, and the two mounting plates 523 are respectively arranged on both sides of the support platform 80 along the first direction, and are mounted on the two first slide rails 511 on the same side of the support platform 80. Further, the four first slide rails 511 can be arranged in pairs on two opposite sides of the base 40 along the second direction, and the two first slide rails 511 arranged on the same side of the base 40 extend along the same straight line in the first direction.

[0137] In this way, by at least two first slide rails 511 arranged in parallel and at intervals along the second direction, the mounting plate 523 is mounted on the first slide rails 511 arranged in parallel and at intervals along the first direction, thereby increasing the flatness and stability of the mounting plate 523.

[0138] See also Fig. 9 and Fig.10 , Fig. 9 is a schematic structural diagram of a force applying device 70 according to an embodiment of the present application, Fig.10 FIG. 7 is a schematic diagram of the exploded structure of the force applying device 70 of the embodiment of the present application, in which the actuating mechanism 73 is hidden. In some embodiments, the force applying device 70 includes a locking member 71, which is located at the end of the force applying device 70 along the third direction and is used to connect with the battery 200.

[0139] Specifically, the locking member 71 may be columnar and include two end faces opposite to each other along the third direction. The end of the locking member 71 away from the bracket 60 along the third direction may be provided with an internal thread and locked with the battery 200 to be tested by a threaded connection. The position where the battery 200 to be tested is connected to the locking member 71 is the point where the force applying device 70 applies the force to the battery 200. The position of the force applying point corresponds to the position of the locking member 71, that is, the position of the force applying device 70. When the force applying device 70 applies a force along the third direction to the battery 200, the battery 200 may be deformed or displaced at the force applying point. Since the locking member 71 is firmly connected to the battery 200, the locking member 71 and the corresponding force applying point on the battery 200 are displaced synchronously.

[0140] In some embodiments, the test equipment 2000 includes a plurality of force-applying devices 70. By adjusting the positions of the force-applying devices 70 in the first direction and the second direction to correspond to the positions at which the battery 200 to be tested is subjected to force under actual driving conditions, and further applying a force corresponding to the magnitude and direction of the force applied at the corresponding positions under driving conditions to the connection between the locking member 71 and the battery 200, the test equipment 2000 can simulate the situation in which the battery 200 is subjected to torsional force under actual driving conditions.

[0141] In this way, by providing a locking piece 71 at the end of the force applying device 70 in the third direction to connect with the battery 200, it is ensured that the force applying device 70 is stably connected to the battery 200 during the test and keeps applying force in the third direction to the battery 200.

[0142] See also Fig.10 In some embodiments, the force-applying device 70 includes a movable component 72, which is connected to the locking member 71, and the movable component 72 is used to compensate for the displacement of the locking member 71 along the first direction and / or the second direction when the force-applying device 70 drives the battery 200 to move along the third direction.

[0143] Specifically, when the force applying device 70 applies a force along the third direction to the battery 200, the battery 200 will generate a certain displacement due to deformation, for example, the corners of the battery 200 will be tilted or curled, thereby driving the locking member 71 to generate displacements along the first direction, the second direction and the third direction. In order to prevent the locking member 71 from deflecting along the first direction and the second direction during the test, the force applying device 70 is provided with a movable component 72 to drive the locking member 71 to move in the opposite direction to the curling or tilting of the battery 200 while displacing along the third direction, so as to compensate for the displacement of the locking member 71 along the first direction and / or the second direction.

[0144] In this way, the movable assembly 72 compensates for the displacement of the locking member 71 along the first direction and / or the second direction when the force applying device 70 applies force to the battery 200 , thereby preventing the force applying device 70 from being excessively deformed during the test and protecting the test equipment 2000 .

[0145] See also Fig. 9 and Fig.10 In some embodiments, the movable component 72 includes a fixed member 721 and a movable member 722 movably connected to the fixed member 721 via a spherical joint, the movable member 722 is fixedly connected to the locking member 71, and the movable member 722 is used to compensate for the displacement of the locking member 71 along the first direction and / or the second direction when the locking member 71 moves along the third direction.

[0146] Specifically, the fixing member 721 may be a nut 7211, and the movable member 722 may be a ball bearing 7222. The ball bearing 7222 includes a plurality of spherical rolling bodies arranged around the axis, and the fixing member 721 and the movable member 722 are in contact and connected through the spherical rolling bodies. The axis of the movable member 722 is vertically arranged along the third direction, and a plurality of spherical pairs are formed between the fixing member 721 and the movable member 722, which are arranged around the axis of the fixing member 721 and are also distributed along the horizontal plane where the first direction and the second direction are located. The movable member 722 is fixedly connected to the locking member 71, and can move synchronously with the locking member 71 when the locking member 71 moves. When the battery 200 is curled or tilted, the movable member 722 and the fixing member 721 are squeezed in the first direction and the second direction, causing the rolling body to rotate, driving the movable member 722 to move in the opposite direction of the curling or tilting of the battery 200 through the position change of the spherical pair, thereby compensating for the displacement of the locking member 71 in the first direction and / or the second direction.

[0147] In this way, the fixed part 721 and the movable part 722 in the movable component 72 are movably connected by a spherical pair, and the movable part 722 is fixedly connected to the locking part 71, so that the movable part 722 can drive the locking part 71 to move relative to the fixed part 721 along the first direction and the second direction, thereby compensating for the displacement of the locking part 71 and the battery 200 in the first direction and / or the second direction.

[0148] See also Fig. 9 and Fig.10 In some embodiments, the fixing member 721 is sleeved on the outside of the movable member 722 , and the movable member 722 is sleeved on an end of the locking member 71 away from the battery 200 .

[0149] Specifically, the movable member 722 and the fixed member 721 may both be hollow columnar or disc-shaped, and the locking member 71, the movable member 722 and the fixed member 721 may be sequentially sleeved from top to bottom along the third direction. The locking member 71, the movable member 722 and the fixed member 721 may be coaxial along the third direction. The movable member 722 is a ball bearing 7222, and the rolling element in the ball bearing 7222 may be an end of the locking member 71 away from the battery 200 along the circumference of the locking member 71. The fixed member 721 is a fastening nut 7211, which is sleeved outside the ends of the movable member 722 and the locking member 71 away from the battery 200. When the force applying device 70 applies a force in the third direction to the battery 200 through the locking member 71, the fixed member 721 forms a centripetal extrusion force on the movable member 722 and the locking member 71, so that the movable member 722 and the locking member 71 move along the second direction and / or the third direction.

[0150] In this way, the fixing member 721 is sleeved outside the movable member 722, and the movable member 722 is sleeved on the locking member 71, so that the force-applying device 70 has a compact structure, thereby saving space. In addition, such a design is conducive to the fixing member 721, the movable member 722 and the locking member 71 to maintain coaxiality, ensuring the consistency of the force applied by the force-applying device 70 and the displacement direction of the battery 200.

[0151] See also Fig. 9 and Fig.10 In some embodiments, the force-applying device 70 includes an actuating mechanism 73 and a connecting assembly 74, the connecting assembly 74 is connected to the fixing member 721, the actuating mechanism 73 is mounted on the bracket 60 and connected to the connecting assembly 74, and the actuating mechanism 73 is used to provide a third-direction force to the battery 200 through the connecting assembly 74 and the locking member 71.

[0152] Specifically, the actuating mechanism 73 may be a mechanism or device that can provide motive force, such as a motor 731, a hydraulic press, or an air pump. The locking member 71, the movable assembly 72, the connecting assembly 74, and the actuating mechanism 73 may be arranged in sequence from top to bottom along the third direction, and the actuating mechanism 73 may push up or pull down the battery 200 connected to the locking member 71 along the third direction. The actuating mechanism 73 may be inserted into a through hole on the first support plate 61, and a side of the actuating mechanism 73 close to the battery 200 is fixedly connected to the fixing member 721 through the connecting assembly 74, and may move synchronously with the connecting assembly 74, the movable assembly 72, and the locking member 71.

[0153] When there are multiple force applying devices 70, the actuating mechanism 73 of each force applying device 70 can independently output different forces, so that each force applying device 70 can independently control the displacement size and displacement speed of the battery 200 at the corresponding force applying point.

[0154] In this way, by connecting the actuating mechanism 73 to the connecting assembly 74 , connecting the connecting assembly 74 to the fixing member 721 , and fixing member 721 to the locking member 71 , the actuating mechanism 73 can control the force applying device 70 to apply a force in a third direction to the battery 200 .

[0155] See also Fig. 9 and Fig.10 In some embodiments, the connecting assembly 74 includes a connecting seat 741 and a bearing sleeve 742 connected to the connecting seat 741 , the fixing member 721 is fixedly disposed in the bearing sleeve 742 , and the connecting seat 741 is connected to the actuating mechanism 73 .

[0156] Specifically, the connecting seat 741 includes a connecting frame 7411 and a connecting sleeve 7412 fixedly installed in the connecting frame 7411. The connecting frame 7411 is fixedly connected to the third slider 782, and the connecting frame 7411 is formed with a hollow installation space along the third direction to accommodate the connecting sleeve 7412. One end of the connecting sleeve 7412 is fixedly connected to the connecting frame 7411, and the connecting sleeve 7412 may be formed with an annular fin to engage with the connecting frame 7411, and the other end of the connecting sleeve 7412 is connected to the bearing sleeve 742 or the actuating mechanism 73. Two connecting sleeves 7412 may be provided, and the two connecting sleeves 7412 are arranged along the third direction, the upper connecting sleeve 7412 is connected to the bearing sleeve 742, and the lower connecting sleeve 7412 is connected to the actuating mechanism 73.

[0157] The bearing sleeve 742 is a hollow cylindrical structure, and a through hole is formed between the two end surfaces along the third direction. The locking member 71 , the movable member 722 and the fixing member 721 are sleeved together and installed in the bearing sleeve 742 .

[0158] In this way, the connecting seat 741 is connected to the supporting sleeve 742 and the actuating mechanism 73, and the fixing member 721 is fixedly arranged in the supporting sleeve 742, so as to maintain the connection between the actuating mechanism 73 and the connecting component 74 and the fixing member 721 stable, and the actuating mechanism 73 can stably apply force to the battery 200 through the fixing member 721 and the connecting component 74.

[0159] See also Fig.10 In some embodiments, the force applying device 70 includes a pressure sensor 75 , which is connected to the connecting seat 741 and the bearing sleeve 742 and is used to detect the force applied by the actuating mechanism 73 to the battery 200 .

[0160] Specifically, the pressure sensor 75 can be in a hollow column or disc shape, the bearing sleeve 742 can be sleeved outside the pressure sensor 75, and the connecting sleeve 7412 can be sleeved inside the pressure sensor 75, so that the structure is compact and the equipment space is saved. When the actuating mechanism 73 generates a force in the third direction, the connecting seat 741 is firstly acted upon and transmits the force to the pressure sensor 75 and the movable component 72 and the locking member 71 in the bearing sleeve 742, and then applies a force to the battery 200 through the locking member 71. The pressure sensor 75 is disc-shaped and takes the third direction as the central axis, so that it can fully sense the force applied by the actuating mechanism 73 along the third direction.

[0161] In this way, the connection seat 741 and the bearing sleeve 742 are connected through the pressure sensor 75, so as to detect the force applied by the actuating mechanism 73 to the connection assembly 74 in real time, and then confirm the stress state of the battery 200 during the test process.

[0162] See also Fig. 9and Fig.10 In some embodiments, the force applying device 70 includes an elastic component 76 , which connects the movable member 722 and the connecting seat 741 and is used to apply an elastic force along a third direction to the movable member 722 .

[0163] Specifically, the elastic component 76 includes a structure or device that can generate elastic force through elastic deformation. In one example, the elastic component 76 includes a tension spring 761 and a tension spring seat 762, and one end of the tension spring 761 in the third direction is connected to the tension spring seat 762 and is installed in the connecting seat 741 through the tension spring seat 762. One end of the tension spring 761 away from the tension spring seat 762 can be connected to the movable member 722. When the actuating mechanism 73 applies a force along the third direction, the tension spring 761 is deformed, and the tension spring 761 can be stretched or compressed in the third direction in the opposite direction to the force applied by the actuating mechanism 73, and at the same time, the movable member 722 and the fixed member 721 are twisted to compensate for the displacement of the locking member 71. When the actuating mechanism 73 removes the force, the tension spring 761 recovers the deformation, thereby applying an elastic force along the third direction and in the opposite direction to the force applied by the actuating mechanism 73 to the movable member 722, so that the movable member 722 and the fixed member 721 recover the relative position before the compensation displacement.

[0164] In this way, the movable part 722 and the connecting seat 741 are connected by the elastic component 76, and an elastic force along the third direction is applied to the movable part 722, so that after the test is completed and the force applying device 70 removes the force on the battery 200, the force applying device 70 can be automatically reset.

[0165] In some embodiments, the force applying device 70 includes a third slide rail 781 and a third slider 782 slidably connected to the third slide rail 781 , the third slide rail 781 is connected to the bracket 60 and extends along the third direction, and the third slider 782 is connected to the connecting seat 741 .

[0166] Specifically, the third slide rail 781 is disposed on the second support plate 62, and can be fixedly connected to the second support plate 62 and the third support plate 63 by fasteners such as bolts. The third slide rail 781 extends linearly along the third direction, and the third slider 782 slides relative to the third slide rail 781 and the bracket 60 along the extension direction of the third slide rail 781, that is, the third direction. The side of the third slider 782 away from the third slide rail 781 is fixedly connected to the connecting seat 741, driving the connecting seat 741 and the movable component 72 and the locking member 71 installed on the connecting seat 741 to move synchronously with the third slider 782 in the third direction.

[0167] In this way, through the cooperation of the third slide rail 781 and the third slider 782, the third slide rail 781 is connected to the bracket 60 and extends along the third direction, and the third slider 782 is connected to the connecting seat 741, thereby limiting the displacement of the force-applying device 70 along the third direction when applying force to the battery 200.

[0168] See also Figure 4 and Figure 5 In some embodiments, there are multiple force applying devices 70, and the multiple force applying devices 70 are distributed at intervals.

[0169] Specifically, the points of action of the torsional force on the tested battery 200 under driving conditions can be known through simulation or actual testing of a vehicle 1000 equipped with a battery 200. The points of action of the torsional force on the battery 200 under driving conditions may be one, two, three, four, six, eight or more than eight. The number of force-applying devices 70 is multiple and is the same as the number of points of action of the torsional force on the battery 200 under driving conditions, and each force-applying device 70 can be set corresponding to one point of action. The bracket 60 corresponds one-to-one to the force-applying device 70, and the force-applying device 70 is arranged on the same or different second slide rails 521 at intervals along the first direction and the second direction through the bracket 60.

[0170] In one example, the number of the second slide rails 521 is four, wherein two second slide rails 521 are arranged on the same side of the support platform 80, and the other two second slide rails 521 are arranged on the other side of the support platform 80 along the first direction. The second slide rails 521 arranged on the same side of the support platform 80 are arranged in parallel and at a small distance. The bracket 60 can be mounted on the two second slide rails 521 on the same side of the support platform 80, the first support plate 61 connects the two second slide rails 521, the through hole of the first support plate 61 is formed between the two second slide rails 521 on the same side, and the actuating mechanism 73 can pass through the middle of the two second slide rails 521. By connecting the same bracket 60 with two second slide rails 521, the flatness and stability of the bracket 60 are enhanced. Furthermore, a plurality of brackets 60 and force applying devices 70 can be arranged on the two second slide rails 521 on the same side.

[0171] When there are multiple force-applying devices 70 and multiple brackets 60 , the number of the second drive assemblies 54 is the same as the number of the force-applying devices 70 , and each bracket 60 is individually connected to a group of second drive assemblies 54 .

[0172] In this way, by distributing a plurality of force-applying devices 70 at intervals, the force applied by the force-applying devices 70 to the battery 200 can simulate the actual force conditions of the battery 200 under driving conditions, thereby increasing the reliability of the test results.

[0173] Please refer again Figure 4 In some embodiments, the testing device 2000 further includes a supporting platform 80 , which is disposed on the base 40 , and the adjusting device 50 and the bracket 60 are distributed on one side of the supporting platform 80 , and the supporting platform 80 is used to place the battery 200 .

[0174] Specifically, the support platform 80 includes a support seat 81 and a support plate 82 connected to the support seat 81. The support seat 81 may be in a rectangular or cube shape and is fixedly connected to the base 40. The end surface of the support seat 81 facing away from the base 40 may be higher than the base 40 by a certain distance along the third direction. The height of the support seat 81 above the base 40 may be close to the height of the locking member 71 of the force applying device 70 above the base 40.

[0175] The support plate 82 is disposed on the end surface of the support seat 81 away from the base 40, and is used to place the battery 200. The support plate 82 is connected to the third driving assembly 84, and the third driving assembly 84 is used to drive the support plate 82 to move relative to the battery 200 along the first direction and / or the second direction. A plurality of guide grooves 83 are provided on the support plate 82, and the guide grooves 83 are spaced apart along the first direction and / or the second direction. The guide grooves 83 are used to limit the direction and distance of relative movement when the battery 200 and the support plate 82 generate relative movement.

[0176] Before the test device 2000 tests the battery 200, the battery 200 is placed on the support platform 80. Then, the position of the force-applying device 70 in the first direction and the second direction is adjusted and the locking member 71 is locked with the battery 200. Subsequently, the support platform 80 is separated from the battery 200, and the battery 200 is kept in motion only by the force applied by the force-applying device 70 and undergoes a torsional strength test.

[0177] In this way, the support platform 80 is set on the base 40, and the adjustment device 50 and the bracket 60 are distributed on one side of the support platform 80. Therefore, when the battery 200 to be tested is placed on the support platform 80, the adjustment device 50 can adjust the force application point of the force application device 70 on the battery 200 according to the actual size of the battery 200. The operation is convenient and the force application position is more accurate.

[0178] In a second aspect, the present application provides a battery testing method, which is implemented using the testing device 2000 of any of the above-mentioned embodiments.

[0179] See also Fig.11 The battery testing method of the embodiment of the present application comprises the following steps:

[0180] Step S10, controlling the force applying device 70 to apply force to the battery 200;

[0181] Step S20, obtaining displacement data of the battery 200;

[0182] Step S30, obtaining the force applied by the force applying device 70 to the battery 200;

[0183] Step S40, determining the torsional strength test result of the battery 200 according to the corresponding relationship between the displacement data and the applied force.

[0184] In step S10, the actuating mechanism 73 is connected to the CPU and the PLC controller via the Ethernet interface, and the magnitude and direction of the force that may be applied to the battery 200 under actual driving conditions are input to the CPU and / or the PLC controller, so as to control the actuating mechanism 73 to apply a force that can simulate the force under driving conditions to the battery 200 to be tested. In some embodiments, the force applying device 70 can also apply a regularly changing force to the battery 200, for example, controlling the force applying device 70 to apply a gradually increasing pressure upward along a third direction to the battery 200.

[0185] In some embodiments, different force applying devices 70 can be controlled separately by different actuating mechanisms 73, so as to apply different forces at different force applying points. For example, two force applying devices 70 located on the same side of the support platform 80 respectively apply opposite pressure and tension along the third direction to two corners of the battery 200 on the side to test the torsional strength of the battery 200 on the side.

[0186] In step S20, the battery 200 is deformed by tension or pressure, and the force application point is displaced in the same direction as the force applied by the force applying device 70. The displacement sensor detects the displacement data of the force application point along the third direction after the battery 200 is subjected to the force applied by the force applying device 70.

[0187] In step S30, the force applying device 70 may transmit the force data actually applied to the tested battery 200 to the PLC controller through the actuating mechanism 73, and the PLC controller transmits the force data actually applied by the force applying device 70 to the tested battery 200 to the CPU. The force data actually applied to the tested battery 200 may include the position of the force application point, the magnitude and direction of the force, and the time of applying the force.

[0188] In step S40, by combining the relationship curve between the displacement data and time of the same force application point and the relationship curve between the force applied by the force application device 70 and time, a relationship curve between the displacement data and the applied force is obtained, so that the tester can make an intuitive judgment.

[0189] In some embodiments, the preset displacement allowed for the power battery 200 under the torsional force can be determined based on the torsional strength that the battery 200 needs to achieve during actual driving. If the displacement data of the tested battery 200 when the applied force reaches or exceeds the force to which the battery 200 is subjected under actual driving conditions is less than or equal to the preset displacement, it is determined that the tested battery 200 has passed the torsional strength test. If the displacement data of the tested battery 200 when the applied force reaches or exceeds the force to which the battery 200 is subjected under actual driving conditions is greater than the preset displacement, it is determined that the tested battery 200 has not passed the torsional strength test.

[0190] The battery testing method provided in the second aspect of the present application is implemented using the testing device 2000 proposed in the first aspect of the present application, and therefore has all the beneficial effects of the testing device 2000, has higher test reliability, and has better compatibility with batteries 200 of different sizes.

[0191] See also Fig.12 In some embodiments, the battery testing method further comprises:

[0192] Step S50, obtaining the magnitude and direction of the force acting on the battery 200 under driving conditions;

[0193] Step S60, controlling the force applying device 70 to apply a force to the battery 200 with the same magnitude and direction as that under the driving condition;

[0194] Step S70, obtaining the decibel of noise generated by the battery 200;

[0195] Step S80 , determining a torsional strength test result of the battery 200 according to the decibel of noise generated by the battery 200 .

[0196] In step S50, the magnitude and direction of the force applied to the battery 200 under driving conditions can be obtained through a driving test or simulation of the vehicle 1000 equipped with the battery 200 to be tested. The force obtained in step S50 refers to the pressure or tension applied to the battery 200 in the third direction, that is, the force that can cause the battery 200 to twist. Step S50 can be performed before step S10.

[0197] In step S60, the magnitude and direction of the force applied to the battery 200 under driving conditions are input through the CPU, and then the magnitude and direction of the force to be applied at each force application point in a single test can be transmitted to the force application device 70 corresponding to the force application point through the PLC controller, and the force application device 70 is controlled to apply the same magnitude and direction of the force applied to the corresponding force application point of the tested battery 200 as under driving conditions, so as to simulate the force condition of the battery 200 under driving conditions. Step S10 and step S60 can be executed simultaneously.

[0198] In step S70, the decibel of noise generated by the battery 200 after the displacement is caused by the force is detected by a decibel meter. Step S70 can be performed after step S10 or step S60, and can be performed synchronously with step S20, step S30 or step S40. In other embodiments, step S70 can be performed before or after step S20, and before step S40.

[0199] In step S80, when the battery 200 is displaced by the force, that is, deformed, the battery end cover 30 may deviate greatly from the shell, thereby causing abnormal noise during driving of the vehicle 1000. Therefore, it is necessary to detect the noise decibels generated by the battery 200 after the torsional strength test and determine whether the battery 200 has passed the torsional strength test based on the noise decibels.

[0200] In this way, by obtaining the force conditions of the battery 200 under driving conditions and controlling the force applying device 70 to apply the same magnitude and direction of force to the battery 200 as under driving conditions, the driving conditions are simulated for testing to ensure the reliability of the test results. By obtaining the noise decibels generated by the battery 200 during the test and determining the test results based on the noise decibels, it is ensured that the battery 200 does not cause noise interference under driving conditions.

[0201] See also Fig.13 In some embodiments, determining the torsional strength test result of the battery 200 according to the decibel of noise generated by the battery 200 includes:

[0202] Step S81, if the noise decibel generated by the battery 200 is higher than the preset decibel, it is determined that the torsional strength test of the battery 200 fails;

[0203] Step S82: If the noise decibel generated by the battery 200 is less than or equal to the preset decibel, it is determined that the torsional strength test of the battery 200 has passed.

[0204] Specifically, the preset decibel is the decibel value of abnormal noise that can be recognized by passengers and the driver of the vehicle 1000 during the driving of the vehicle 1000.

[0205] In step S81, if the noise decibel generated by the battery 200 is higher than the preset decibel, it can be inferred that the tested battery 200 will produce large deformation and displacement due to insufficient torsional strength during the driving of the vehicle 1000, thereby generating abnormal noise and causing the vehicle 1000 to fail the road test.

[0206] In step S82, if the noise decibel generated by the battery 200 is less than or equal to the preset decibel, it can be inferred that the torsional strength of the tested battery 200 during the driving of the vehicle 1000 is sufficient, and the deformation and displacement of the battery 200 when subjected to torsional force are small, and no abnormal noise will be generated, or the noise decibel generated is low enough to be identified as abnormal noise, which is conducive to the vehicle 1000 passing the road test smoothly.

[0207] In this way, when the noise decibel generated by the battery 200 is higher than the preset decibel, it is determined that the torsional strength test of the battery 200 has failed, and when the noise decibel generated by the battery 200 is less than or equal to the preset decibel, it is determined that the torsional strength test of the battery 200 has passed, thereby ensuring that the noise generated by the battery 200 during actual driving is lower than the noise standard recognized by the human ear, thereby improving the driving experience.

[0208] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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 application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A testing device for testing the torsional strength of a battery, characterized in that: The test equipment includes: Base; An adjusting device, wherein the adjusting device is arranged on the base; a bracket, the bracket being mounted on the adjusting device, the adjusting device being used to drive the bracket to move along a first direction and a second direction; and at least one force applying device, the force applying device being mounted on the bracket, the force applying device being used to be connected to the battery and applying a force along a third direction to the battery, wherein the first direction, the second direction and the third direction are perpendicular to each other; The force-applying device comprises a locking piece, a movable assembly, an actuating mechanism and a connecting assembly, wherein the locking piece is located at an end of the force-applying device along the third direction, and an end of the locking piece away from the bracket along the third direction is provided with an internal thread and is locked with the battery through a threaded connection; the movable assembly is connected to the locking piece; the connecting assembly is connected to the movable assembly, and the movable assembly is used to compensate for the displacement of the locking piece along the first direction and / or the second direction when the force-applying device drives the battery to move along the third direction; the actuating mechanism is mounted on the bracket and connected to the connecting assembly, and the actuating mechanism is used to provide the battery with a force in the third direction through the connecting assembly and the locking piece. The movable component includes a fixed part and a movable part movably connected to the fixed part through a spherical pair, the fixed part is sleeved outside the movable part, the movable part is sleeved on an end of the locking part away from the battery, the locking part, the movable part and the fixed part are coaxial along the third direction; the movable part is fixedly connected to the locking part, and the movable part is used to compensate for the displacement of the locking part along the first direction and / or the second direction when the locking part moves along the third direction; the connecting component includes a connecting seat and a bearing sleeve connected to the connecting seat, the fixed part is fixedly arranged in the bearing sleeve, and the connecting seat is connected to the actuating mechanism.

2. The test device according to claim 1, characterized in that The adjusting device includes a first adjusting mechanism and a second adjusting mechanism arranged on the first adjusting mechanism. The first adjusting mechanism is arranged on the base and is used to drive the second adjusting mechanism to move along the first direction to drive the bracket to move along the first direction. The second adjusting mechanism is used to drive the bracket to move along the second direction.

3. The testing device according to claim 2, characterized in that The first adjusting mechanism includes a first slide rail and a first slider slidably disposed on the first slide rail, the first slide rail extends along the first direction, and the second adjusting mechanism is fixed on the first slider.

4. The testing device according to claim 3, characterized in that The second adjustment mechanism includes a mounting plate, a second slide rail and a second slider slidably disposed on the second slide rail. The second slide rail is disposed on the mounting plate and extends along the second direction. The bracket is fixed on the second slider.

5. The testing device according to claim 4, characterized in that The adjusting device comprises a first driving assembly, wherein the first driving assembly is mounted on the base and connected to the mounting plate, and the first driving assembly is used for driving the mounting plate to move so that the second adjusting mechanism moves along the first direction.

6. The testing device according to claim 5, characterized in that The adjusting device comprises a second driving assembly, the second driving assembly is mounted on the mounting plate, the second driving assembly is connected to the bracket, and the second driving assembly is used to drive the bracket to move along the second direction.

7. The testing device according to claim 4, characterized in that A reinforcement structure is arranged on one side of the mounting plate facing the base.

8. The testing device according to claim 4, characterized in that The number of the first slide rails is at least two, at least two of the first slide rails are arranged in parallel and at intervals along the second direction, and the mounting plate is mounted on the at least two of the first slide rails.

9. The testing device according to claim 1, characterized in that The force applying device comprises a pressure sensor, which is connected to the connecting seat and the bearing sleeve and is used to detect the force applied by the actuating mechanism to the battery.

10. The testing device according to claim 1, characterized in that The force applying device includes an elastic component, which connects the movable member and the connecting seat and is used to apply an elastic force along the third direction to the movable member.

11. The testing device according to claim 1, characterized in that The force applying device includes a third slide rail and a third slider slidably connected to the third slide rail, the third slide rail is connected to the bracket and extends along the third direction, and the third slider is connected to the connecting seat.

12. The testing device according to claim 1, characterized in that There are multiple force applying devices, and the multiple force applying devices are distributed at intervals.

13. The testing device according to claim 1, characterized in that The testing device further comprises a supporting platform, wherein the supporting platform is arranged on the base, the adjusting device and the bracket are distributed on one side of the supporting platform, and the supporting platform is used for placing the battery.

14. A battery testing method, characterized in that: The battery testing method is implemented using the testing device according to any one of claims 1 to 13, and the battery testing method comprises: Controlling the force applying device to apply force to the battery; Acquiring displacement data of the battery; Acquiring the force applied by the force applying device to the battery; The torsional strength test result of the battery is determined according to the corresponding relationship between the displacement data and the applied force.

15. The battery testing method according to claim 14, characterized in that: The battery testing method further includes: Obtaining the magnitude and direction of the force acting on the battery under driving conditions; Controlling the force applying device to apply a force of the same magnitude and direction as that under the driving condition to the battery; Obtain the decibel of noise generated by the battery; The torsional strength test result of the battery is determined based on the decibel of noise generated by the battery.

16. The battery testing method according to claim 15, characterized in that: Determining the torsional strength test result of the battery according to the decibel of noise generated by the battery includes: If the decibel of noise generated by the battery is higher than a preset decibel, it is determined that the torsional strength test of the battery has failed; If the noise decibel generated by the battery is less than or equal to the preset decibel, it is determined that the torsional strength test of the battery has passed.

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