Battery test device

Abstract

A battery testing device characterized in that it comprises: a first box (10), a second box (20), and a temperature control system; wherein the first box (10) has a first receiving chamber (101), the temperature control system and the second box (20) are both arranged in the first receiving chamber (101), and the temperature control system serves to control the temperature of the first receiving chamber (101); wherein the second box (20) comprises several plate bodies, the several plate bodies being connected to one another to enclose and form a second receiving chamber (201), the second receiving chamber (201) being used to receive a battery (30); wherein at least one of the several plate bodies is movable relative to the first box (10) to control the communication between the first receiving chamber (101) and the second receiving chamber (201).

Description

TECHNICAL AREA The present application belongs to the technical field of battery testing and specifically relates to a battery testing device. STATE OF THE ART Temperature shock, also known as high-low temperature cycle shock or cold-heat shock, is based on the mechanism of evaluating product quality by testing the stresses caused by the thermal expansion and contraction of the materials contained within the object at different temperatures. A battery temperature shock test refers to the sudden exposure of the battery to extreme conditions to test its performance; however, the devices used for battery temperature shock testing in relevant technology cannot rapidly change the environment, resulting in the inability to obtain accurate and reliable temperature shock test data. CONTENT OF THE PRESENT APPLICATION The present application aims to provide a battery testing device that at least solves the problem that the devices for temperature shock testing of the battery in relevant technology cannot quickly change the environment, which results in the inability to acquire accurate and reliable temperature shock test data of the battery. To solve the aforementioned technical problems, the present application is implemented as follows: in a first aspect, embodiments of the present application provide a battery testing apparatus comprising: a first box, a second box, and a temperature control system; wherein the first box has a first receiving space, the temperature control system and the second box are both arranged in the first receiving space, the temperature control system serving to control the temperature of the first receiving space; wherein the second box comprises several plate bodies, the several plate bodies being connected to one another to enclose and form a second receiving space, the second receiving space serving to receive a battery;wherein at least one of the several plate bodies is movable relative to the first box in order to control the communication between the first recording room and the second recording room; Optionally, the multiple plate bodies comprise two first side plates arranged in a first direction, two second side plates spaced apart in a second direction, and a cover plate arranged in a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; wherein the cover plate is connected to the first side plate and the second side plate, with a side of the first side plate facing away from the cover plate and a side of the second side plate facing away from the cover plate each being connected to the first box, wherein the first side plate, the second side plate, the cover plate, and the first box form an enclosure for the second receiving space, and wherein at least one of the two second side plates can be raised and lowered relative to the first box. Optionally, it is provided that along the third direction Z, a side of the first box facing the second side plate is provided with a groove, wherein a side of the second side plate facing the first box is provided with a projection, the projection being able to be embedded in the groove. Optionally, the battery test device may further include a sealing element; the sealing element is arranged in the groove, the sealing element being connected to the first box, the sealing element serving to seal the first box and the projection. Optionally, the second box may also include an explosion protection valve; wherein the explosion protection valve is arranged on a side of the cover plate facing away from the second receiving chamber, and wherein the explosion protection valve is connected to the cover plate. Optionally, the battery test device may also include a terminal block, the terminal block being embedded in the floor of the second receiving chamber, the terminal block serving to electrically connect to the battery and the charge / discharge test device. Optionally, the battery testing device may further include a lifting device; the lifting device is provided in the first receiving space, wherein the lifting device is connected to at least one second side plate, and wherein the lifting device serves to drive the second side plate for raising and lowering. Optionally, the second box may also include a temperature control system, wherein the temperature control system is connected to the plate body, and the temperature control system serves to control the temperature of the plate body. Optionally, the temperature control system includes a heating element, wherein the heating element is connected to the plate body, and the heating element serves to heat the plate body. Optionally, the temperature control system includes a cooling element, wherein the cooling element is connected to the plate body, and the cooling element serves to cool the plate body. Optionally, the panel body is provided to comprise a main body section and a thermal insulation layer; wherein the panel body has a cavity, wherein the thermal insulation layer is arranged in the cavity, wherein the thermal insulation layer is connected to the body, and wherein the thermal insulation layer serves to thermally insulate the first receiving space and the second receiving space. Optionally, the battery testing device may also include a temperature sensor; the temperature sensor is arranged in the first receiving chamber, and the temperature sensor is connected to the first box. Optionally, the temperature sensor is provided for in the second recording chamber, with the temperature sensor being connected to the second box. In one embodiment of the present application, the temperature control system and the second box are both arranged in the first receiving compartment of the first box, and the battery is placed in the second receiving compartment, which is formed by the connection of several plate bodies, wherein at least one of the several plate bodies is movable relative to the first box in order to control the communication between the first receiving compartment and the second receiving compartment. In this way, when performing temperature shock tests, it is not necessary to transfer the battery from one environment to another, thereby avoiding temperature fluctuations due to external factors during the transfer process, ensuring the accuracy of the test conditions, and consequently increasing the reliability of the test data.Furthermore, the battery testing device of the present application has a simple structure and is easy to manufacture. Additional aspects and advantages of the present application are partly set out in the following description, and some will be evident from the following description or can be learned through practical application of the present application. BRIEF DESCRIPTION OF THE DRAWING The above and / or additional aspects and advantages of the present application will become apparent and easily understandable from the description of the exemplary embodiments in conjunction with the following drawings, wherein: Fig. 1 is a schematic representation of a battery testing device according to an exemplary embodiment of the present application; Fig. 2 is a schematic representation of a second box according to an exemplary embodiment of the present application; Fig. 3 is a schematic representation of the connection of a second side plate to the first box according to an exemplary embodiment of the present application; Fig. 4 is a schematic representation of a terminal block according to an exemplary embodiment of the present application; Fig. 5 is a top view of a second side plate and a lifting device according to an exemplary embodiment of the present application; Fig.Figure 6 is a side view of a second side plate and a lifting device according to an embodiment of the present application. Reference symbol: 10. First box; 101. First recording compartment; 102. Groove; 20. Second box; 21. First side plate; 22. Second side plate; 221. Projection; 23. Cover plate; 24. Explosion protection valve; 25. Column; 26. Connecting beam; 201. Second recording compartment; 30. Battery; 40. Terminal block; 51. First camera; 52. Second camera; 60. Charge / discharge test device; 70. Sealing element; 80. Lifting device; 81. Servo motor; 82. Worm gear-worm reduction gear; 83. Connecting rod; 84. Threaded rod nut; 85. Threaded rod; X. First direction; Y. Second direction; Z. Third direction. DETAILED DESCRIPTION The embodiments of the present application are described in detail below. Examples of these embodiments are illustrated in the drawings, where identical or similar reference numerals denote identical or similar elements or elements with the same or similar function. The embodiments described below with reference to the accompanying drawings are exemplary and serve only to illustrate the present application; they should not be interpreted as limiting the present application. All other embodiments that a person skilled in the art in this field could derive from the embodiments in the present application without any creative activity are within the scope of protection of the present application. In the description and claims of this application, the terms "first" and "second" may expressly or implicitly include one or more of these features. In the description of this application, "several" means two or more than two, unless otherwise specified. Furthermore, in the description and claims, "and / or" represents at least one of the combined objects, and the sign " / " generally indicates that the previously and subsequently combined objects are in an "or" relationship. In describing the present application, it should be noted that the orientations or positional relationships indicated by the terms "middle", "longitudinal", "transverse", "length", "width", "thickness", "top", "bottom", "in front", "after", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are the orientations or positional relationships shown on the drawings and serve only for the convenience and simplification of the description of the present application, rather than indicating or implying that the device or element in question must have a particular orientation or orientation or be designed and operated in a particular orientation, and should therefore not be construed as limiting the present application. In describing the present application, it should be noted that the terms "assembly," "connecting," and "linking," unless expressly stated otherwise and limited, are to be understood in the broadest sense. For example, they may refer to a permanent, detachable, or integral connection; a mechanical or electrical connection; a direct connection or an indirect connection via an intermediate medium; and internal communication between two elements. The person skilled in the art in this field will be able to understand the specific meanings of the foregoing terms in the present application according to specific situations. In the relevant technology, the basket test method is typically used to test the temperature shock test data of the battery. The battery test device that uses the basket test method usually has a dual temperature chamber design. The battery test device includes a high-temperature chamber and a low-temperature chamber that are independent of each other, as well as a battery carrier device that can move between them. Here, the batteries are transferred between the two temperature chambers by a mechanical transport device (usually a basket) to achieve a rapid temperature change. However, the battery test device using the basket test method has the following disadvantages: when the battery is transferred between the high-temperature chamber and the low-temperature chamber, the basket's mesh structure means the battery is directly exposed to room temperature, leading to a temperature equalization effect (the battery temperature undergoes undesirable changes during the transfer process and cannot maintain the preset extreme temperature conditions). These temperature fluctuations significantly impair the accuracy and reliability of the test data and make it difficult to realistically reproduce the battery's performance under extreme temperature conditions. Furthermore, existing battery testing equipment often has only a single function and struggles to meet the complex requirements of modern battery testing. Most battery testing equipment can only perform a single temperature shock test and is unable to conduct other relevant tests simultaneously. Consider, for example, the ice water shock test system and the electromagnetic rail transport battery test bench: although they allow for rapid temperature changes, their temperature change range is limited by the external media and the type of movement involved. Moreover, switching on the power during the test process poses a serious safety risk. It is not possible to simultaneously verify the battery's temperature shock resistance under operating conditions, nor can other environmental factors such as mechanical vibrations and changes in humidity be examined synchronously.This limitation means that development engineers have to set up different test facilities multiple times to complete a comprehensive evaluation, which significantly reduces testing efficiency. The battery testing device provided by the embodiments of the present application is below explained in detail with reference to specific embodiments and their application scenarios and the accompanying drawings. As shown in Figs. 1 and 2, the embodiment of the present application proposes a battery testing device comprising: a first box 10, a second box 20, and a temperature control system; the first box 10 has a first receiving chamber 101, wherein the temperature control system and the second box 20 are both provided in the first receiving chamber 101, and the temperature control system serves to control the temperature of the first receiving chamber 101; the second box 20 comprises several plate bodies, wherein the several plate bodies are connected to one another to enclose and form a second receiving chamber 201, wherein the second receiving chamber 201 serves to receive a battery 30; wherein at least one of the several plate bodies is movable relative to the first box 10 to control the communication between the first receiving chamber 101 and the second receiving chamber 201. In one embodiment of the present application, the temperature control system and the second box 20 are both arranged in the first receiving chamber 101 of the first box 10, and the battery 30 is placed in the second receiving chamber 201, which is formed by the connection of several plate bodies, wherein at least one of the several plate bodies is movable relative to the first box 10 in order to control the communication between the first receiving chamber 101 and the second receiving chamber 201. In this way, when performing temperature shock tests, it is not necessary to transfer the battery 30 from one environment to another, thereby avoiding temperature fluctuations due to external factors during the transfer process, ensuring the accuracy of the test conditions, and consequently increasing the reliability of the test data.Furthermore, the battery testing device of the present application has a simple structure and is easy to manufacture. In some embodiments, the first box 10 serves as the main temperature box and comprises several side plates and a thermal insulation layer, wherein the several side plates are connected one after the other and enclose and form the first receiving chamber 101; a chamber is provided in the side plates, in the interior of which the thermal insulation layer is laid to thermally insulate and heat-conserve the first receiving chamber 101. In some embodiments, the thermal insulation layer comprises one or more substances, including but not limited to aerogel fleece, vacuum insulation board, nanomicroporous thermal insulation boards, ceramic fiberboards, rock wool boards, glass wool boards, rigid polyurethane foam, phenolic foam, or phase-change thermal insulation composite material; wherein the aerogel fleece is produced by combining nanoscale silicon dioxide aerogel with a fiber-reinforced base material and exhibits an ultra-low thermal conductivity coefficient as well as hydrophobic properties; the vacuum insulation board is produced with a porous core material as a framework, which is covered with a high-barrier membrane and vacuum-sealed, thereby reducing the thermal conductivity coefficient to below 0.004 W / (m·K);The nanomicroporous thermal insulation board is manufactured by pressing microsilicon powder with ceramic fibers and can withstand temperatures exceeding 1000 °C; the ceramic fiberboard is made from ceramic fiber wadding and inorganic adhesive, is lightweight and resistant to thermal shock; rock wool or glass wool boards are manufactured through a molten fiber formation process, are cost-effective and easy to process; the rigid polyurethane foam or phenolic foam is injected into a cavity by foam forming and serves both as thermal insulation and structural support; the phase-change thermal insulation composite system is manufactured by adsorption of phase-change material onto porous base materials and can absorb or release heat within specific temperature ranges, thus achieving an active thermal buffering effect. Preferably, the aerogel fleece or the nanomicroporous thermal insulation board is used as the thermal insulation layer, since these have a low thermal conductivity coefficient, low thickness and low weight and enable efficient thermal insulation in limited space, and the weight of the board body is not significantly increased in order to ensure smooth operation of the lifting device 80 and at the same time effectively prevent heat transfer between the first receiving chamber 101 and the second receiving chamber 201, thereby increasing the precision and reliability of the temperature shock test. In some embodiments, it is provided that the sizes of the second box 20 can be determined according to the size of the battery 30, wherein the sizes of the first box 10 can be determined according to the size of the second box 20, which is not limited in the embodiments of the present application. For example, the dimensions of the first box 10 are approximately 1000 mm × 1000 mm × 1000 mm, the dimensions of the second box 20 are 300 mm × 300 mm × 300 mm, the second box 20 being in a central position of the first box 10 to ensure that the distance from the second box 20 to the chamber wall of the first receiving chamber 101 is the same, thus ensuring temperature uniformity. In some embodiments, the battery test device further comprises a control unit, wherein the temperature control system includes a cooling unit, a heating unit and a recirculating air duct unit; the cooling unit, the heating unit and the recirculating air duct unit are each electrically connected to the control unit, and the control unit controls the operation of the cooling unit, the heating unit and the recirculating air duct unit. The first receiving chamber 101 has an air inlet and an air outlet. The cooling unit comprises a compressor, a condenser, an expansion valve, and an evaporator, the evaporator being located at the air inlet of the first receiving chamber 101. The heating unit is an electric heating tube located on the air outlet side facing the evaporator. The recirculating air duct unit comprises a fan and a circuit board. The fan is mounted at the top of the first receiving chamber 101. The fan connects the air inlet to the air outlet and drives the air in the first receiving chamber 101 to flow sequentially through the evaporator and the electric heating tube, and then distribute it evenly throughout the first receiving chamber 101 via the circuit board.If the battery 30 is subjected to a heat shock, the controller, based on the feedback signal from the temperature sensor located in the first recording chamber 101, stops the compressor and switches on the electric heating element. Hot air is then blown into the first recording chamber 101 by the fan, causing the temperature in the first recording chamber 101 to rise rapidly to a preset high-temperature value (e.g., 120°C ± 2°C). If the battery 30 is subjected to a cold shock, the controller regulates the cooling by the compressor and switches off the electric heating element or reduces its power, causing the temperature in the first recording chamber 101 to drop rapidly to a preset low-temperature value (e.g., -40°C ± 2°C). In other embodiments, the temperature control system may also include an electric heating wire mounted in the chamber of the first box 10 to heat the first receiving chamber 101; the temperature control system may also include a liquid nitrogen tank and a solenoid valve, wherein the solenoid valve is embedded in the first box 10, the solenoid valve connects the first receiving chamber 101 to the liquid nitrogen tank, and the solenoid valve controls the flow of liquid nitrogen to cool the first receiving chamber 101. It is understandable that the electric heating wire can be selected from at least one of the following types: iron-chromium-aluminum heating wire, nickel-chromium alloy heating wire, or halogen heating tube. The electric heating wire can be evenly distributed in the first chamber 10 to ensure uniformity of the heating temperature. For example, a nickel-chromium alloy heating wire can be chosen, whose specific resistance is stable and whose temperature coefficient changes only slightly, thus ensuring linear stability of the output power during the heating process, making it easier to control temperature fluctuations in the first chamber 101. It is understood that the temperature control system uses a graduated control strategy that is automatically adjusted based on the temperature setting value; for example, if the difference between the target temperature and the current temperature is greater than a preset threshold, the controller operates the heating or cooling unit at full load so that the temperature in the first recording room 101 quickly approaches the target temperature; if the difference between the target temperature and the current temperature is less than or equal to a preset threshold, the controller retrieves the appropriate PID (proportional-integral-differential) parameters based on the current temperature range and performs a precise adjustment of the heating or cooling unit so that the temperature in the first recording room 101 is kept stable at the target temperature;Before the lifting device 80 opens the second side plate 22, the control generates a forward compensation signal based on the preset shock temperature and the feedback from the temperature sensor provided in the second receiving chamber 201, in order to dynamically compensate for the output power of the heating unit or cooling unit and thus to compensate for the temperature disturbance due to the communication between the first receiving chamber 101 and the second receiving chamber 201;When the test enters the temperature holding phase, the controller switches to temperature holding standby mode, reduces the output power of the heating or cooling unit, and maintains the temperature in the first recording chamber 101 within a preset tolerance range. This graduated control strategy allows the temperature control system to automatically adjust the control parameters based on the temperature setting value and real-time feedback, significantly improving the response speed and interference resistance of the temperature shock test while ensuring temperature control accuracy. Optionally, as shown in Fig. 1 and Fig.Figure 2 shows that the multiple plate bodies comprise two first side plates 21 arranged in a first direction X, two second side plates 22 spaced apart in a second direction Y, and a cover plate 23 arranged in a third direction Z, wherein the first direction X, the second direction Y, and the third direction Z are perpendicular to each other; wherein the cover plate 23 is connected to the first side plate 21 and the second side plate 22, wherein a side of the first side plate 21 facing away from the cover plate 23 and a side of the second side plate 22 facing away from the cover plate 23 are each connected to the first box 10, wherein the first side plate 21, the second side plate 22, the cover plate 23, and the first box 10 enclose and form a second receiving space 201, and at least one of the two second side plates 22 can be raised and lowered relative to the first box 10. In one embodiment of the present application, several plate bodies are provided, comprising two first side plates 21 arranged in the first direction X, two second side plates 22 spaced apart in the second direction Y, and a cover plate 23 arranged in the third direction Z, wherein the cover plate 23 connects the first side plates 21 and the second side plates 22, wherein a side of the first side plate 21 facing away from the cover plate 23 and a side of the second side plate 22 facing away from the cover plate 23 are each connected to the first box 10, wherein the first side plate 21, the second side plate 22, the cover plate 23, and the first box 10 enclose and form a second receiving space 201, and at least one of the two second side plates 22 can be raised and lowered relative to the first box 10, so that when the second side plate 22 is raised,The second recording chamber 201 is quickly connected to the first recording chamber 101, allowing the temperature environment in the first recording chamber 101 to immediately act on the battery 30 to achieve a rapid temperature shock. When the second side plate 22 lowers, the second recording chamber 201 reverts to a closed space, so that the battery 30 does not require any physical movement during the hot-cold cycle. This avoids disturbances from the external environment due to movement, further improving the efficiency of the temperature shock and the accuracy of the test data. At the same time, raising and lowering the second side plate 22 relative to the first chamber 10 helps to simplify the overall structure of the device and reduce manufacturing costs. In some embodiments, as shown in Fig. 2, the second box 20 further comprises four columns 25 and two connecting beams 26, the four columns 25 being arranged at the four corners of the second box 20, the first side plate 21 and the cover plate 23 being fixedly connected to the columns 25, and the two second side plates 22 being slidably connected to the corresponding columns 25, thus creating a dynamic sealing connection. Connecting beams 26 are also attached to the sides of the two columns 25 associated with the second side plates 22 to ensure a stable connection between the two columns 25; and sealing strips are attached to the side of the connecting beams 26 facing the columns 25 to seal the connecting beams 26 and the second side plates 22. It is understood that the first direction X, the second direction Y, and the third direction Z are pairwise perpendicular to each other, which can be "perpendicular" in the strict sense, i.e., the angle between any two of the directions X, Y, and Z is 90°; or it can be "approximately perpendicular," which specifically means that the angle between any two of the first direction X, the second direction Y, and the third direction Z includes a certain error, taking into account measurements and the errors associated with measuring certain quantities (i.e., the limits of the measuring system), the error being within an acceptable range of deviation for a given value as determined by an average person skilled in the art in this field; for example, the angle between any two of the first direction X, the second direction Y, and the third direction Z is 90° ± 5°. Optionally, as shown in Fig. 3, it is provided that along the third direction Z a side of the first box 10 facing the second side plate 22 is provided with a groove 102, wherein a projection 221 is provided on a side of the second side plate 22 facing the first box 10, and the projection 221 can be embedded in the groove 102. In one embodiment of the present application, the groove 102 is arranged on the side of the first box 10 facing one of the second side plates 22, wherein the projection 221 is arranged on a side of the second side plate 22 facing the first box 10, so that when the second side plate 22 is in a closed state, the projection 221 is embedded in the groove 102 in order to form an effective seal between the second receiving chamber 201 and the first receiving chamber 101, to reduce the heat exchange between them and to ensure that during the temperature shock test the influence of the temperature in the first receiving chamber 101 on the battery 30 located in the second receiving chamber 201 is avoided, thereby preventing the test accuracy due to heat leakage through insufficient sealing.Simultaneously, embedding the projection 221 in the groove 102 can also perform a guiding and positioning function, ensuring the stability of the stroke movement of the second side plate 22 and the accuracy of the closing position, preventing jamming or seal failure due to movement deviations, and thereby further improving the operational reliability and service life of the battery test device. Furthermore, this mechanical embedding structure is simple and reliable, easy to machine and assemble, which reduces manufacturing and maintenance costs. Optionally, the battery test device, as shown in Fig. 3, also includes a sealing element 70; the sealing element 70 is arranged in the groove 102, connected to the first box 10, and serves to seal the first box 10 and the projection 221, thus further enhancing the sealing effect between the first box 10 and the second side plate 22. Specifically, the sealing element 70 can fill a small gap between the groove 102 and the projection 221, effectively blocking airflow and heat conduction between the first receiving chamber 101 and the second receiving chamber 201, and preventing heat leakage due to structural tolerances. This significantly improves the stability of the temperature field and the insulating effect to ensure the temperature accuracy and consistency of the environment in which the battery 30 is located during the thermal shock test. Furthermore, the sealing element 70 exhibits a damping effect, absorbing vibrations and shocks generated during the stroke of the second side plate 22, and reducing wear and noise from rigid contact, thereby extending the service life of the battery test device. Simultaneously, the elastic deformation of the sealing element 70 can compensate for minor structural dimensional changes due to temperature fluctuations or long-term use, maintaining reliable sealing performance over the long term and thus further increasing the stability and durability of the battery test device. In some embodiments, the sealing element 70 is provided to comprise, but is not limited to, one or more of the following components: fluororubber O-ring, foam silicone sealing strip, metallic hollow O-ring, graphite composite insert, magnetofluid sealing element 70, wear-resistant PTFE sealing strip, ceramic fiber sealing cord or liquid sealing adhesive.Preferably, taking into account the frequent stroke movement of the second side plate 22 and the extreme temperature cycling environment during the temperature shock test, a combination structure consisting of a fluororubber O-ring and a wear-resistant PTFE membrane is used as the sealing element 70. The fluororubber O-ring provides the main sealing force, while the wear-resistant PTFE membrane is located on the side wall of the groove 102 to ensure low-friction guidance and prevent wear of the O-ring. This ensures both the sealing performance and meets the requirements for wear resistance during frequent movements, thus guaranteeing the test accuracy and the reliability of the device. Optionally, as shown in Fig. 2, the second box 20 may also include an explosion protection valve 24; the explosion protection valve 24 is arranged on the side of the cover plate 23 facing away from the second receiving chamber 201 and is connected to the cover plate 23, so that in the event of thermal runaway of the battery 30 or a sudden increase in internal pressure, the high-pressure gas in the second receiving chamber 201 can be released in a timely manner via the explosion protection valve 24 to prevent the second box 20 from bursting due to overpressure and thereby increase the safety performance of the battery test device.In addition, the explosion protection valve 24 is located on the outside of the cover plate 23, which both facilitates directed gas venting and prevents the high-temperature and high-pressure gas from directly affecting the operating personnel or surrounding equipment, thus further ensuring the safety of the test process. In some embodiments, the battery test device further comprises a safety protection system consisting of a monitoring unit, an alarm unit, a pressure relief unit, and a passive protection unit. The monitoring unit includes a flammable gas concentration sensor located in the second receiving chamber 201 and connected to the second box 20. The gas concentration sensor serves to detect in real time the concentration of flammable gases (including, but not limited to, hydrogen, carbon monoxide, methane, and volatile organic compounds) that may be released by the battery 30 in the event of thermal runaway or under abnormal operating conditions, and transmits the detection signal to the controller in real time.The alarm unit is electrically connected to the control unit, whereby the control unit causes the alarm unit to emit an audible and visual alarm signal and remotely transmits the alarm information to a monitoring terminal when the gas concentration sensor detects that the gas concentration exceeds a preset safety threshold, in order to enable the operating personnel to initiate emergency measures in a timely manner. In some embodiments, the explosion protection valve 24 is provided with an elastic pressure element and a sealing diaphragm, wherein the explosion protection valve 24 opens automatically to release high-pressure gas in a directed and rapid manner into the first receiving chamber 101 or into the outside environment when a thermal runaway of the battery 30 leads to a sudden pressure increase in the second receiving chamber 201 that exceeds a set threshold, thus preventing the second box 20 from bursting due to pressure build-up. In some embodiments, the first box 10 and the second box 20 are made of high-strength metal material (such as reinforced stainless steel or carbon steel sheets), with reinforcing ribs arranged between the box wall panels and the box joints fastened with explosion-proof bolts. Furthermore, an explosion-proof fiber layer or an explosion-proof coating can be applied to the inner wall of the first box 10 and / or the second box 20 to absorb the energy of the explosion shock wave and prevent fragments from being flung. Optionally, as shown in Fig. 1 and Fig. 4, the battery test device further comprises a terminal 40 embedded in the bottom of the second receiving chamber 201. The terminal 40 serves to electrically connect the battery 30 and the charge / discharge test device 60, respectively. In this way, when the battery 30 is placed in the second receiving chamber 201, an electrical connection can be conveniently established to an external charge / discharge test device 60 or a test device to enable functions such as controlling the charging and discharging of the battery 30, monitoring voltage and current, and data acquisition. This fulfills the need for real-time monitoring of the dynamic changes in the electrical performance of the battery 30 during the temperature shock test.Furthermore, the terminal block 40 is embedded in the chamber floor, thus making optimal use of the floor space of the first box 10, avoiding messy cable routing in the first recording chamber 101, reducing the effects of cable movement or poor contacts on the test results and at the same time helping to maintain the airflow organization and the uniformity of the temperature field in the second recording chamber 201. In some embodiments, the terminal 40 has a ceramic-insulated high-temperature wiring column and a four-conductor Kelvin connection structure. The ceramic-insulated high-temperature wiring column comprises a ceramic insulating body and a first and a second conductor passing through the ceramic insulating body, the first and second conductors being assigned to the current path and the voltage sensing path, respectively. A sealing structure is provided between the terminal 40 and the first box 10, comprising a first sealing element 70 between the terminal 40 and the first box 10 and a second sealing element 70 between the conductors and the ceramic insulating body.The first sealing element 70 is a high-temperature resistant fluororubber O-ring, which is embedded between the inner wall of the mounting hole in the base of the first box 10 and the flange surface of the terminal block 40 to create a radial and axial seal between the terminal block 40 and the first box 10 and to prevent gas leakage between the first receiving chamber 101 and the outside world; the second sealing element 70 is a high-temperature epoxy resin adhesive or a glass sinter layer, which is filled into the gap between the conductors and the ceramic insulating body to ensure a gas-tight seal between the conductors and the insulator; due to the double sealing structure described above, the terminal block 40 can maintain good sealing performance even under severe temperature shock and pressure fluctuations and ensure the separation effect between the first receiving chamber 101 and the outside world. In some embodiments, the charge / discharge test device 60 is arranged outside the first housing 10 and electrically connected to the battery 30, located in the second receiving compartment 201, via the terminal block 40. The charge / discharge test device 60 controls the charging and discharging of the battery 30 and monitors its electrical performance parameters in real time, including, but not limited to, voltage, current, capacity, charge and discharge efficiency, DC internal resistance, and AC impedance. The charge / discharge test device 60 is also communicatively connected to a controller to synchronize the electrical performance parameters with the temperature parameters and to generate the power decay curve and the trend in the capacity change of the battery 30 during the temperature shock. In some embodiments, the battery testing device further comprises a first camera 51 and a second camera 52. The first camera 51 is arranged in the first recording chamber 101 and connected to the first box 10 to capture images of the environmental conditions in the first recording chamber 101 in real time. The second camera 52 is arranged in the second recording chamber 201 and connected to the second box 20 to capture images of the physical condition of the battery 30 in the second recording chamber 201 in real time, including external deformation of the battery 30, swelling of the casing, leakage of electrolyte solution, the appearance of flames or smoke, or similar situations.The first camera 51 and the second camera 52 are each communicatively connected to a display or a remote monitoring terminal so that the operator can intuitively and in real time observe the internal condition without having to open the box; this avoids the introduction of external disturbances through frequent opening of the box and at the same time ensures the safety of the operator. Optionally, the battery test device further comprises a lifting device 80; the lifting device 80 is arranged in the first receiving space 101, the lifting device 80 is connected to at least one second side plate 22, and the lifting device 80 serves to drive the second side plate 22 for raising and lowering, in this way the lifting device 80 can automatically drive the raising and lowering of the second side plate 22, thereby facilitating the testing of the battery test device. It is understandable that the lifting device 80 can precisely control the opening height, lifting speed and dwell time of the second side plate 22 according to a preset test program, thereby making the switching of the communicating state between the first recording chamber 101 and the second recording chamber 201 more accurate and controllable, and thus ensuring that the test conditions remain consistent for each temperature shock, which increases the repeatability and reliability of the test data. In some embodiments, as shown in Fig. 5 and Fig. 6, the lifting device 80 comprises a servo motor 81, a worm gear reduction gear 82, a connecting rod 83, a threaded rod nut 84 and a threaded rod 85; A worm gear-worm reduction gear 82 is mounted on each side of the servomotor 81, the two output ends of the servomotor 81 are connected to the input end of a worm gear-worm reduction gear 82, the output end of the worm gear-worm reduction gear 82 is positively connected to the threaded rod 85, the threaded rod nut 84 is positively connected to the threaded rod 85, the connecting rod 83 is fixedly connected to the threaded rod nut 84, and the two ends of the connecting rod 83 are each fixedly connected to the two second side plates 22.In this way, the servomotor 81 drives the worm gear reduction gear 82 to rotate the threaded rod 85, which in turn drives the connecting rod 83 for raising and lowering via the threaded rod nut 84, and consequently the two second side plates 22 are raised and lowered synchronously with the first box 10, thus preventing jamming, tilting or damage to the sealing structure caused by asynchronous raising of the two second side plates 22, ensuring that the structures such as projections 221 and groove 102 between the second side plates 22 and the first box 10 engage precisely, and guaranteeing the sealing performance. It is understood that the worm gear-worm reduction gear 82 can reduce the speed of the servomotor 81 and increase the torque to make it easier for the servomotor 81 to drive the raising and lowering of the second side plates 22; in addition, the worm gear-worm reduction gear 82 has self-locking, i.e., when the servomotor 81 stops, the force of gravity on the second side plates 22 cannot drive the worm gear-worm reduction gear 82 in the opposite direction due to its own angle of friction, so that the second side plates 22 can remain stable in any position after raising without the servomotor 81 having to work to maintain the height, thereby reducing the energy consumption of the servomotor 81. In some embodiments, the stroke of the lifting device 80 is 250 mm, the stroke speed of the lifting device 80 is adjustable, the adjustment range is within 1 to 5 seconds when the entire stroke is completed, this allows the operator to adjust the speed of opening and closing the second side plates 22 according to different test requirements, in order to control the communication speed between the first recording chamber 101 and the second recording chamber 201, to achieve fine-tuned control of the temperature shock rate and thereby further improve the adaptability and test accuracy of the test device. Optionally, the second box 20 also includes a temperature control system connected to the plate body, which serves to regulate the temperature of the plate body. This allows the temperature of the plate body to be actively controlled via the temperature control system in order to control and maintain the initial temperature in the second recording chamber 201 and to avoid disturbances to the temperature shock test results caused by the plate body's own thermal conductivity. It is understood that if there is a drastic temperature change in the first recording chamber 101, and the temperature of the plate body is not adjusted synchronously, the plate body will become a thermal bridge or cold source and conduct heat to the second recording chamber 201, so that the temperature in the second recording chamber 201 will deviate from the initial temperature and thus affect the test results. Specifically, an extreme temperature of -40°C is set, with the temperature of the first recording chamber 101 being regulated to -40°C by the temperature control system; the initial temperature of the second recording chamber 201 is 25°C, with the temperature of the first recording chamber 101 being transferred to the second recording chamber 201 via the plate body as the temperature of the first recording chamber 101 drops drastically, with the temperature control system of the second chamber 20 being switched on to maintain the initial temperature of the second recording chamber 201, so that the plate body cannot transfer a cold source and thus the initial temperature of the second recording chamber 201 is kept at approximately 25°C to ensure that the battery 30 can be immediately exposed to the set extreme temperature environment, thereby significantly improving the speed and accuracy of the temperature shock. Optionally, the temperature control system includes a heating element connected to the plate body, which serves to heat the plate body. In this way, the temperature of the plate body can be maintained by the heating element during the low-temperature shock test to prevent the excessively cooled plate body from transferring the cold source to the second recording chamber 201, which would cause the temperature field distribution around the battery 30 to become uneven and impair the test results. In some embodiments, the heating element comprises, but is not limited to, one or more polyimide heating films, silicone rubber heating plates, mica heating plates, cast aluminum heating plates, transparent conductive heating layers, carbon crystal heating layers, or PTC heating elements. Preferably, the heating element is designed as a polyimide heating film or silicone rubber heating plate. The polyimide heating film or silicone rubber heating plate exhibits properties such as low thickness, low weight, and good flexibility. It can fit snugly against the plate body without increasing the inertia of the lifting device, and it exhibits a fast thermal response rate. Furthermore, it can precisely control the temperature of the plate body according to the instructions of the temperature control system to ensure the uniformity and stability of the temperature field in the second receiving chamber 201. Optionally, the temperature control system includes a cooling element connected to the plate body, which serves to cool the plate body so that during the high-temperature shock test the temperature of the plate body can be maintained by the cooling element to prevent the overheated plate body from transferring heat to the second recording chamber 201, which would lead to an uneven temperature field distribution around the battery 30 and would impair the test results. In some embodiments, the cooling element may, but is not limited to, comprise one or more semiconductor cooling disks, compressor refrigeration circuits, liquid cooling circuit lines, vortex tube coolers or phase change cooling elements.Preferably, a semiconductor cooling disk or a liquid cooling circuit is used as the cooling element, wherein the semiconductor cooling disk or the liquid cooling circuit has the features of a compact design and fast temperature control response, whereby the temperature of the disk body can be precisely controlled according to the instructions of the temperature control system, so that it is ensured that the temperature of the disk body always matches the high-temperature environment of the first recording chamber 101 during the thermal shock, in order to avoid thermal disturbance of the disk body on the second recording chamber 201 and thereby ensure the uniformity of the temperature field around the battery 30 and the accuracy of the test data. Optionally, the panel body comprises a main body section and a thermal insulation layer; the panel body has a cavity, wherein the thermal insulation layer is arranged in the cavity, the thermal insulation layer is connected to the main body and the thermal insulation layer serves to provide thermal insulation for the first receiving chamber 101 and the second receiving chamber 201, so that the thermal insulation layer reduces the heat conduction between the first receiving chamber 101 and the second receiving chamber 201 and effectively improves the thermal insulation effect between the two chambers.Specifically, if the first recording chamber 101 is in a high-temperature or low-temperature condition, the thermal barrier layer can block heat transfer through the plate body to the second recording chamber 201, thereby reducing heat leakage due to the thermal conductivity of the plate body, in order to maintain the stability and uniformity of the temperature field in the second recording chamber 201 and to ensure that the battery 30 can be exposed to the exact set temperature environment during the temperature shock test. It should be noted that the thermal insulation layer in the second box may or may not be identical to the thermal insulation layer in the first box, which is not restricted in the embodiments of the present application. Optionally, the battery test device also includes a temperature sensor; the temperature sensor is arranged in the first receiving chamber 101, wherein the temperature sensor is connected to the first box 10, thereby enabling the temperature sensor to accurately detect temperature changes in the first receiving chamber 101 and to provide reliable feedback signals for the precise control of the temperature control system. Specifically, the temperature data recorded by the temperature sensor can be transmitted to the controller and compared with a preset test temperature, whereby the control system can promptly adjust the heating or cooling power when a deviation of the actual temperature from the set value is detected, in order to ensure that the first receiving chamber 101 is always kept in the required high-temperature or low-temperature state, thus providing stable and reliable environmental conditions for the temperature shock test of the battery. Optionally, the temperature sensor is located in the second recording chamber 201, with the temperature sensor being connected to the second box 20 so that the temperature sensor can accurately detect temperature changes in the second recording chamber 201, thereby enabling the precise detection of the temperature jump rate at the moment of the temperature shock, the stability during the temperature holding phase, and temperature fluctuations throughout the entire test cycle to ensure the authenticity and reliability of the test data. In some embodiments, it is provided that 8 to 12 platinum resistance temperature sensors are arranged evenly inside the first box 10, while four platinum resistance temperature sensors are arranged distributed inside the second box 20. The method for temperature shock testing of the battery, as provided in the embodiments of the present application, comprises the following steps: an initialization phase: first, the temperature control system is configured so that the temperature in the first receiving chamber 101 corresponds to the target start-up test temperature, which is typically 25 °C room temperature. The temperature in the first receiving chamber 101 is monitored in real time by a temperature sensor. Once the temperature has reached and stabilized at the set value, the control system directs the lifting device to raise the second side plate 22, thus connecting the second receiving chamber 201 to the first receiving chamber 101. This exposes the battery 30 placed in the second receiving chamber 201 to the room temperature environment in order to achieve thermal equilibrium between the battery 30 and the test environment.In this phase, the charge / discharge test device 60 can perform an initial performance test of the battery 30 via the terminal 40, including but not limited to capacity calibration, internal resistance measurement, open circuit voltage measurement or the like, and store the acquisition data in the memory module; simultaneously, the first camera 51 and the second camera 52 each capture status images in real time from the first recording room 101 and the second recording room 201 and transmit them to the monitoring terminal so that the operator can confirm the initial state as normal. Test stage: After initialization, the controller controls the lifting device to lower the second side plate 22, so that the second side plate 22 and the first box 10 are interlocked by the projection 221 and the groove 102. The temperature control system then starts the rapid approach mode in the staged control strategy to change the temperature in the first receiving chamber 101 to the target temperature (e.g., low temperature -40 °C or high temperature 85 °C) at maximum speed. When the temperature sensor detects that the difference between the current temperature and the target temperature is less than a preset threshold, the temperature control system switches to precision control mode and uses a PID algorithm to maintain the temperature in the first receiving chamber 101 precisely and stably at the target temperature.Once the temperature has stabilized, the control unit activates the lifting mechanism to rapidly raise the second side plate 22 within 1 to 2 seconds, thereby abruptly exposing the battery 30 to the extreme temperature environment of the first recording chamber 101 and resulting in a rapid temperature shock. During the shock process, the temperature control system activates the shock compensation mode.Based on the temperature changes reported back by the temperature sensor in the second recording chamber 201, forward compensation is performed for the heating unit or the cooling unit to compensate for temperature disturbances caused by the communication between the chambers; simultaneously, the charge / discharge test device 60 continuously monitors the changes in the electrical performance parameters of the battery 30, such as voltage, current, capacity, efficiency, or the like, while the second camera 52 records the physical condition of the battery 30, such as deformation of appearance, fluid leakage, or the like, in real time. Final phase: After completion of the specified shock time and number of cycles, the controller activates the temperature control system to return the temperature in the first receiving chamber 101 to room temperature and, via the lifting device, actuates the second side plate 22 to open it, thereby exposing the battery 30 to a room temperature environment once again. After the temperature has stabilized, the operator removes the sample battery 30, performs a visual inspection and subsequent performance tests (such as capacity loss test, internal resistance increase test, or the like), and compares the test results with the initial performance data to evaluate the effect of the temperature shock on the performance of battery 30. As used herein, reference to the descriptions of the terms “an embodiment”, “some embodiments”, “exemplary embodiment”, “example”, “specific examples”, or “some examples”, or similar terms, means that specific features, structures, materials, or special characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this description, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or special characteristics may be combined in any or more embodiments or examples in any suitable manner. Although the embodiments of the present application have been shown and described, the person skilled in the art in this field will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principle and purpose of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

Battery test device, characterized in that it comprises: a first box (10), a second box (20) and a temperature control system; wherein the first box (10) has a first receiving space (101), the temperature control system and the second box (20) are both arranged in the first receiving space (101), and the temperature control system serves to control the temperature of the first receiving space (101); wherein the second box (20) comprises several plate bodies, the several plate bodies being connected to one another to enclose and form a second receiving space (201), the second receiving space (201) being used to receive a battery (30); wherein at least one of the several plate bodies is movable relative to the first box (10) to control the communication between the first receiving space (101) and the second receiving space (201). Battery test device according to claim 1, characterized in that the multiple plate bodies comprise two first side plates (21) arranged in a first direction (X), two second side plates (22) spaced apart in a second direction (Y) and a cover plate (23) arranged in a third direction (Z), wherein the first direction (X), the second direction (Y) and the third direction (Z) are perpendicular to each other;wherein the top plate (23) is connected to the first side plate (21) and the second side plate (22), wherein a side of the first side plate (21) facing away from the top plate (23) and a side of the second side plate (22) facing away from the top plate (23) are each connected to the first box (10), wherein the first side plate (21), the second side plate (22), the top plate (23) and the first box (10) form an enclosure around the second receiving space (201), wherein at least one of the two second side plates (22) can be raised and lowered relative to the first box (10). Battery testing device according to claim 2, characterized in that along the third direction (Z) a side of the first box (10) facing the second side plate (22) is provided with a groove (102), wherein a side of the second side plate (22) facing the first box (10) is provided with a projection (221), wherein the projection (221) can be embedded in the groove (102). Battery test device according to claim 3, characterized in that the battery test device further comprises a sealing element (70); wherein the sealing element (70) is arranged in the groove (102), the sealing element (70) is connected to the first box (10), and the sealing element (70) serves to seal the first box (10) and the projection (221). Battery test device according to claim 2, characterized in that the second box (20) further comprises an explosion protection valve (24); wherein the explosion protection valve (24) is arranged on a side of the cover plate (23) facing away from the second receiving chamber (201), wherein the explosion protection valve (24) is connected to the cover plate (23); and / or wherein the battery test device further comprises a terminal block (40), the terminal block (40) being embedded in the floor of the second receiving chamber (201), and the terminal block (40) serving to electrically connect to the battery (30) and the charge / discharge test device (60). Battery testing device according to claim 2, characterized in that the battery testing device further comprises a lifting device (80); the lifting device (80) is provided in the first receiving space (101), wherein the lifting device (80) is connected to at least one second side plate (22), wherein the lifting device (80) serves to drive the second side plate (22) for raising and lowering. Battery test device according to claim 2, characterized in that the second box (20) further comprises a temperature control system, the temperature control system is connected to the plate body, and the temperature control system serves to control the temperature of the plate body. Battery test device according to claim 7, characterized in that the temperature control system comprises a heating element, the heating element being connected to the plate body, and the heating element serving to heat the plate body; and / or wherein the temperature control system comprises a cooling element, the cooling element being connected to the plate body, and the cooling element serving to cool the plate body. Battery test device according to claim 1, characterized in that the plate body comprises a main body section and a thermal insulation layer; wherein the plate body has a cavity, the thermal insulation layer is arranged in the cavity, the thermal insulation layer is connected to the body, and the thermal insulation layer serves to thermally insulate the first receiving space (101) and the second receiving space (201). Battery testing device according to one of claims 1 to 9, characterized in that the battery testing device further comprises a temperature sensor; wherein the temperature sensor is arranged in the first receiving chamber (101), wherein the temperature sensor is connected to the first box (10); and / or wherein the temperature sensor is arranged in the second receiving chamber (201), wherein the temperature sensor is connected to the second box (20).

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