Performance detection equipment, performance detection method and comparison method of battery piece

Abstract

The invention discloses performance detection equipment, a performance detection method and a comparison method of a battery piece. The equipment comprises a current detection device, a lighting device, a weight lifting device and a main control device, the main control device is connected with the lighting device and is used for controlling the lighting device to light the battery piece; the main control device is connected with the weight lifting device and is used for controlling the weight lifting device to carry out weight impact work on the battery piece; the current detection device is used for detecting the first current magnitude before the battery piece is impacted by the weight lifting device and the second current magnitude after the battery piece is impacted by the weight lifting device and sending a current detection result to the main control device, so that the main control device judges the performance of the battery piece based on the detection result. According to the invention, performance detection can be carried out on different types of battery pieces, the detection accuracy is high, the detection is more comprehensive, the performance evaluation result can be visually displayed, and the applicability is strong.

Description

Technical Field

[0001] The present invention relates to the technical field of battery detection, and in particular to a performance detection device, a performance detection method and a comparison method for a battery cell. Background Art

[0002] Existing battery cell performance testing equipment can only detect whether a battery cell is damaged or whether a battery cell is stretched or bent, but cannot detect the impact resistance of the battery cell (resistance to hidden cracks or pressure), and cannot intuitively express the current loss rate when the battery cell has hidden cracks or impacts. Therefore, the performance testing of the battery cell using existing battery cell performance testing equipment is not comprehensive enough and cannot accurately evaluate the performance of each battery cell. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a performance detection device, a performance detection method and a comparison method for a battery cell, which can perform performance detection on different types of battery cells with high detection accuracy and more comprehensive detection, and can intuitively display the performance evaluation results, with strong applicability.

[0004] In the first aspect, the present invention provides a performance detection device for a battery cell, comprising a current detection device, a lighting device, a heavy lifting device and a main control device; the main control device is connected to the lighting device, and is used to control the lighting device to illuminate the battery cell; the main control device is connected to the heavy lifting device, and is used to control the heavy lifting device to perform heavy impact on the battery cell; the current detection device is used to detect a first current amount of the battery cell before being impacted by the heavy lifting device and a second current amount after the impact and send the current detection result to the main control device, so that the main control device can judge the performance of the battery cell based on the detection result.

[0005] The present invention controls a heavy lifting device to perform heavy impact on a battery cell and uses a current detection device to detect a first current and a second current of the battery cell before the battery cell is impacted by the heavy lifting device, and sends the current detection result to a main control device so that the main control device determines the performance of the battery cell based on the detection result, thereby comparing the current loss rate of the battery cell before and after the battery cell is impacted by the heavy lifting device and the impact resistance of the battery cell, thereby more accurately and comprehensively detecting the performance of the battery cell.

[0006] Optionally, the performance detection device further includes a displacement driving device, which is connected to one side of the battery cell or the heavy object lifting device and is used to drive the battery cell or the heavy object lifting device to move along the first direction.

[0007] Optionally, the displacement drive device is used to be connected to one side of the battery cell, and is used to drive the battery cell to move to a position adjacent to the lighting device or below the heavy object lifting device.

[0008] The present invention can move the battery cell or the heavy object lifting device along the first direction by arranging a displacement driving device, so that the battery cell is placed below the heavy object lifting device to facilitate heavy object impact work on the battery cell.

[0009] Optionally, the main control device includes a main controller and a display device, and the main controller is communicatively connected with the display device.

[0010] Optionally, the main control device is connected to the lighting device via a voltage regulating module, and is used to control the output voltage of the voltage regulating module to adjust the brightness state of the lighting device.

[0011] The present invention adjusts the brightness state of the lighting device by controlling the output voltage of the voltage regulating module, thereby simulating different lighting states of sunlight and adjusting the brightness state of the lighting device based on actual needs. By adjusting the brightness state of the lighting device, the amount of current flowing through the battery cell when it is illuminated under different brightness states can be detected, thereby better detecting the performance of the battery cell.

[0012] Optionally, it also includes a power switch device and a switching power supply, the input end of the power switch device is connected to the external power supply input terminal, and the output end of the power switch device is respectively connected to the switching power supply, the voltage regulating module, the current detection device, the displacement drive device and the heavy object lifting device; the switching power supply is connected to the main control device.

[0013] The present invention connects the output end of the power switch device with each device in the performance detection equipment of the battery sheet, so that power can be supplied to each device so that each device can be in a normal working state.

[0014] Optionally, the power switch device includes a circuit breaker, a power switch component, a contactor and a filter connected in sequence, the circuit breaker is connected to the external power supply input terminal, and the filter is respectively connected to the switching power supply, the voltage regulating module, the current detection device, the displacement drive device and the heavy object lifting device.

[0015] Optionally, the displacement drive device includes a first screw rod, a screw rod connecting plate, a first servo motor and a first servo encoder connected to the first servo motor, the first servo motor and the first servo encoder are respectively connected to the main control device; the rotating shaft end of the first servo motor is connected to the first screw rod through a coupling, a screw rod connecting plate is sleeved on the first screw rod, and the first screw rod is threadedly connected to the screw rod connecting plate; the screw rod connecting plate is used to fix the battery cell.

[0016] The present invention configures the displacement driving device to include a first screw, a screw connecting plate, a first servo motor and a first servo encoder connected to the first servo motor, so that the displacement driving device can be controlled to move to an ideal position so that the battery cell and the heavy object lifting device are in a facing position, which is convenient for performing heavy object impact work on the battery cell.

[0017] Optionally, the displacement drive device also includes an object detection module, which is arranged on the screw connecting plate; the object detection module is connected to the main control device, and is used to detect whether there is a battery cell on the screw connecting plate, and send the detected object detection signal to the main control device.

[0018] The present invention can detect the presence of a battery cell in real time by arranging the object detection module on the screw connecting plate, so as to facilitate the control of corresponding devices to perform impact resistance performance detection of the battery cell based on the detection signal of the object detection module.

[0019] Optionally, the displacement drive device also includes a first limit sensing mechanism, which is connected to the main control device; the first limit sensing mechanism includes a first negative limit position sensor, a first origin position sensor and a first positive limit position sensor which are sequentially arranged along the displacement direction.

[0020] The present invention can reasonably control the moving range of the displacement drive device by setting the first limit sensing mechanism, and control the moving range within the moving range corresponding to the first negative limit sensor and the first positive limit sensor, so as to facilitate the control of the displacement drive device.

[0021] Optionally, the heavy object lifting device includes an electromagnet, a hammering tool, a second screw rod, a screw rod connecting part, a second servo motor and a second servo encoder connected to the second servo motor, the second servo motor and the second servo encoder are respectively connected to the main control device; the rotating shaft end of the second servo motor is connected to the second screw rod through a coupling, the second screw rod is provided with a screw rod connecting part, and the second screw rod is threadedly connected to the screw rod connecting part; an electromagnet is provided at the bottom of the screw rod connecting part, and the electromagnet is magnetically connected to the magnetic component on the hammering tool below.

[0022] The present invention configures the heavy object lifting device to include an electromagnet, a hammer, a second screw, a screw connecting part, a second servo motor and a second servo encoder connected to the second servo motor, so that the heavy object lifting device can be reasonably controlled to move to an ideal position, thereby facilitating heavy object impact work on the battery cell.

[0023] Optionally, the heavy object lifting device also includes a second limit position sensing mechanism, which is connected to the main control device; the second limit position sensing mechanism includes a second negative limit position sensor, a second origin position sensor and a second positive limit position sensor which are arranged in sequence along the second direction.

[0024] The present invention can reasonably control the moving range of the heavy object lifting device by setting the second limit sensing mechanism, and control the moving range within the moving range corresponding to the second negative limit sensor and the second positive limit sensor, so as to facilitate the control of the heavy object lifting device.

[0025] Optionally, the main control device further includes a human body approach detection device and an alarm device, and the human body approach detection device and the alarm device are electrically connected to the main controller respectively.

[0026] The present invention can detect whether there is a human approach signal in the working area near the equipment by setting a human approach device and an alarm device. If there is a human approach signal, the main controller will control the alarm device to alarm to warn nearby personnel not to enter the working area of ​​the equipment to avoid affecting the normal operation of the equipment and reduce the safety hazards of personnel. Among them, when other abnormal conditions occur in the equipment, the main controller can control the alarm device to alarm to remind the staff to carry out inspection and maintenance in time.

[0027] In a second aspect, the present invention provides a method for detecting performance of a battery cell, comprising:

[0028] The current detection device is controlled to detect a first current amount before the battery sheet is impacted by the heavy object lifting device and a second current amount after the impact when the battery sheet is illuminated by the lighting device;

[0029] The performance of the battery cell is determined based on the detection result of the current detection device.

[0030] The present invention controls a current detection device to detect a first current amount before and a second current amount after a battery cell is impacted by a heavy lifting device when the battery cell is illuminated by a lighting device, and judges the performance of the battery cell based on the detection result of the current detection device. It can compare the current loss rate of the battery cell before and after the battery cell is impacted by the heavy lifting device and the impact resistance of the battery cell, and detect the performance of the battery cell more accurately and comprehensively.

[0031] Optionally, before the current detection device detects the first current amount before the battery sheet is impacted by the heavy object lifting device when being illuminated by the lighting device and the second current amount after the impact, it also includes:

[0032] Obtaining a control instruction, where the control instruction is used to instruct a battery cell performance detection operation;

[0033] After the control instruction is obtained, the battery cell is controlled to move to the bottom of the heavy object lifting device and the lighting device is controlled to illuminate the battery cell.

[0034] The present invention performs the performance detection operation of the battery cell based on the control instruction control, and can trigger the performance detection operation of the battery cell at an appropriate time to ensure the normal operation of the performance detection operation of the battery cell.

[0035] Optionally, the control instruction is automatically triggered based on a control input of the display device or based on a position detection result of the battery cell by an object detection module provided on the displacement drive device.

[0036] The present invention automatically triggers the control command based on the control input of the display device or the position detection result of the battery cell based on the object detection module set on the displacement drive device. The user can perform the performance detection of the battery cell in an appropriate actual input control command based on actual needs, which can improve the user experience. In addition, when the position of the battery cell meets the requirements, the performance detection of the battery cell can also be automatically triggered, without manual operation, simplifying the detection process and saving detection time.

[0037] Optionally, judging the performance of the battery cell based on the detection result of the current detection device specifically includes:

[0038] The current loss rate is calculated based on the first current amount and the second current amount, and the performance level of the battery cell is determined by comparing the calculated current loss rate with a preset comparison table representing the level of battery cell performance.

[0039] The present invention calculates the current loss rate based on the first current amount and the second current amount, and determines the level of battery cell performance by comparing the calculated current loss rate with a preset comparison table that characterizes the level of battery cell performance. The performance of the tested battery cell can be determined, the detection is more comprehensive and the detection results are more intuitive.

[0040] In a third aspect, the present invention provides a method for comparing the performance of a battery cell, which is applied to the performance detection device of any one of the first aspects above, comprising:

[0041] Controlling the current detection device to detect a first current amount before the first battery cell is impacted by the heavy object lifting device and a second current amount after the impact when the first battery cell is illuminated by the lighting device;

[0042] Controlling the current detection device to detect a third current amount before the second battery cell is impacted by the heavy object lifting device and a fourth current amount after the impact when the second battery cell is illuminated by the lighting device;

[0043] The performances of the first battery cell and the second battery cell are compared based on the detection result of the current detection device.

[0044] By comparing the performance of two battery cells based on the detection results of the current detection device, the present invention can determine the current loss rate of two different battery cells before and after being impacted by a heavy lifting device and the impact resistance of the battery cells, thereby more accurately and comprehensively detecting the performance of two different battery cells.

[0045] Optionally, comparing the performance of the first battery cell and the second battery cell based on the detection result of the current detection device specifically includes:

[0046] Calculating a first current loss rate based on the first current amount and the second current amount, and determining the performance level of the first battery cell by comparing the calculated first current loss rate with a preset comparison table characterizing the performance level of the first battery cell;

[0047] Calculating a second current loss rate based on the third current amount and the fourth current amount, and comparing the calculated second current loss rate with a preset comparison table characterizing the level of performance of the second battery cell to determine the level of performance of the second battery cell;

[0048] The performance level of the first battery cell and the performance level of the second battery cell are compared to determine the performance of the first battery cell and the second battery cell.

[0049] The present invention calculates the first current loss rate based on the first current and the second current, and calculates the second current loss rate based on the third current and the fourth current, and judges the level of battery cell performance by comparing the two calculated current loss rates with a preset comparison table that characterizes the level of battery cell performance. The performance of the two tested battery cells can be judged, the detection is more comprehensive and the detection results are more intuitive.

[0050] Optionally, also include:

[0051] The comparison result of the performance of the first battery cell and the second battery cell is displayed on the display device. The present invention can intuitively display the comparison result by displaying the comparison result of the performance of the first battery cell and the second battery cell on the display device, so that the user can intuitively understand the difference in the performance of the two battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a schematic diagram of the electric control structure of a first embodiment of a battery cell performance detection device of the present invention;

[0053] Figure 2 The mechanical structure diagram of the performance testing device of the present invention is shown in FIG. Figure 1 ;

[0054] Figure 3 The mechanical structure diagram of the performance testing device of the present invention is shown in FIG. Figure 2 ;

[0055] Figure 4 It is a schematic diagram of the partial mechanical structure of the performance testing device of the present invention;

[0056] Figure 5 It is a schematic diagram of the electric control structure of the main control device of the present invention;

[0057] Figure 6 is a schematic diagram of the electric control structure of the displacement drive device of the present invention;

[0058] Figure 7is a schematic diagram of the electric control structure of the first limit sensing mechanism of the present invention;

[0059] Figure 8 It is a schematic diagram of the electric control structure of the heavy object lifting device of the present invention;

[0060] Fig. 9 It is a schematic diagram of the mechanical structure of the heavy object lifting device of the present invention;

[0061] Fig.10 is a schematic diagram of the electric control structure of the second limit sensing mechanism of the present invention;

[0062] Fig.11 is a schematic diagram of the electrical control structure of the second embodiment of the performance detection device of the present invention;

[0063] Fig.12 is a schematic diagram of the electrical control structure of the third embodiment of the performance detection device of the present invention;

[0064] Fig.13 is a schematic structural diagram of a power switch device of the present invention;

[0065] Fig.14 is a flow chart of the performance detection method of the present invention;

[0066] Fig.15 is a flow chart of the performance comparison method of the present invention. DETAILED DESCRIPTION

[0067] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. Examples of embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be construed as limiting the present invention. In addition, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0068] In the description of the present invention, it is necessary to understand that the terms "length", "width", "up", "down", "left", "right", "horizontal", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0070] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0072] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the examples of various specific processes and materials provided by the present invention, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0073] like Figures 1 to 4 As shown, Figures 1 to 4The schematic diagram of the structure of the first embodiment of a performance detection device for a battery cell of the present invention is shown, which includes a machine platform, on which a displacement drive device 1, a current detection device 2, a lighting device 3, a heavy object lifting device 4 and a main control device 5 are provided; the main control device 5 is respectively connected to the displacement drive device 1, the current detection device 2, the lighting device 3 and the heavy object lifting device 4. Among them, the lighting device 3 is equivalent to a solar light source, which serves as a solar energy emission source for the battery cell, that is, the battery cell in this embodiment is a photovoltaic battery cell; the lighting device 3 is preferably a tungsten filament lamp, but is not limited thereto. The heavy object lifting device 4 performs a heavy object impact on the battery cell under the control of the main control device 5.

[0074] When it is necessary to test the impact resistance of the battery cell, the main control device 5 controls the lighting device 3 to illuminate the battery cell placed in the initial position according to the input impact resistance control instruction, and the battery detection device detects the first current output by the battery cell in the lighting state before the impact and sends it to the main control device 5. After the current collection before the impact is completed, the main control device 5 controls the displacement drive device 1 to move the battery cell to the bottom of the heavy object lifting device 4, and controls the heavy object lifting device 4 to perform a heavy object impact on the battery cell. After the heavy object impact work is completed, the main control device 5 controls the displacement drive device 1 to drive the battery cell to reset, that is, return to the adjacent position or initial position of the lighting device 3, and controls the lighting device 3 to illuminate the battery cell after the impact. At this time, the current detection device 2 detects the second current output by the battery cell in the lighting state after the impact and sends it to the main control device 5, that is, the current detection device 2 is used to detect the first current of the battery cell before being impacted by the heavy object lifting device 4 and the second current after the impact, and sends the current detection result to the main control device 5 so that the main control device 5 can judge the performance of the battery cell based on the detection result. For example, the main control device 5 performs performance evaluation processing based on the first current amount and the second current amount, and accurately calculates the current loss rate of the battery cell after the impact (that is, the power generation efficiency of the battery cell after the impact can be obtained accordingly) through the first current amount and the second current amount, and performs grade evaluation based on the current loss rate with high accuracy to obtain the corresponding impact resistance performance result of the battery cell and display the result. The performance detection has high accuracy, and the user can intuitively know the impact resistance performance of the battery cell, and the applicability is strong.

[0075] Therefore, the present invention controls the heavy lifting device 4 to perform heavy impact on the battery cell and uses the current detection device 2 to detect the first current and the second current of the battery cell before being impacted by the heavy lifting device 4, and sends the current detection result to the main control device 5 so that the main control device 5 can judge the performance of the battery cell based on the detection result, so as to compare the current loss rate of the battery cell before and after being impacted by the heavy lifting device 4 and the impact resistance of the battery cell, so as to detect the performance of the battery cell more accurately and comprehensively.

[0076] In some embodiments, the performance testing equipment may not be equipped with a displacement drive device 1. In this case, the battery cell and the heavy lifting device 4 are in facing positions. When it is necessary to perform a heavy impact on the battery cell, the heavy lifting device 4 can directly impact the battery cell. The displacement drive device 1 does not need to drive the battery cell or the heavy lifting device 4 to move along the first direction (horizontal direction).

[0077] In some embodiments, the displacement drive device 1 can be connected to one side of the battery cell or the heavy lifting device 4, and is used to drive the battery cell or the heavy lifting device 4 to move along the first direction. For example, the displacement drive device 1 is connected to one side of the battery cell to drive the battery cell to move along the first direction or the displacement drive device 1 is connected to one side of the heavy lifting device 4. In this case, the displacement drive device 1 can drive the heavy lifting device 4 to move along the first direction. Understandably, the displacement drive device 1 can also be connected to one side of the battery cell and the heavy lifting device 4 at the same time, and is used to drive the battery cell and the heavy lifting device 4 to move along the first direction respectively. In this case, the battery cell and the heavy lifting device 4 can be driven by their respective displacement drive devices 1 to move the corresponding distance until the battery cell is directly below the heavy lifting device 4. When the displacement drive device 1 is connected to one side of the battery cell, it is used to drive the battery cell to move to the vicinity of the lighting device 3 or below the heavy lifting device 4.

[0078] The present invention can move the battery cell or the heavy object lifting device 4 along the first direction by providing a displacement driving device 1, so that the battery cell is located below the heavy object lifting device 4, which is convenient for performing a heavy object impact on the battery cell. The present invention can move the battery cell or the heavy object lifting device 4 along the first direction by providing a displacement driving device 1, so that the battery cell is located below the heavy object lifting device 4, which is convenient for performing a heavy object impact on the battery cell.

[0079] Specifically, Figure 2 , Figure 3 and Figure 5 As shown, the main control device 5 includes a main controller 51 and a display device 52, and the main controller 51 is connected to the display device 52 for communication to realize data transmission. The main controller 51 can display data such as current loss rate and performance evaluation results through the display device 52, so that the user can intuitively obtain the performance evaluation results of the battery cell under test through the display device 52. Among them, the main controller 51 is preferably a PLC (Programmable Logi c Control, programmable logic control device), but is not limited thereto.

[0080] Preferably, the display device 52 includes a display screen and a button assembly or a touch display screen, but is not limited thereto.

[0081] In some embodiments, the display screen 52 may only have a display function, and the main controller 51 receives control instructions input from an external device (such as a mobile phone, a computer, etc.) to control the performance detection equipment of the battery cell.

[0082] Furthermore, if Figure 6 As shown, the main control device 5 also includes a human proximity detection device 53 and an alarm device 54, which are electrically connected to the main controller 51 respectively. The human proximity detection device 53 and the alarm device 54 are used to detect whether there is a human proximity signal in the working area near the equipment. If there is a human proximity signal, the main controller 51 will control the alarm device 54 to alarm to warn nearby personnel not to enter the working area of ​​the equipment, avoid affecting the normal operation of the equipment and reduce the safety hazards of personnel. Among them, when other abnormal conditions occur in the equipment, the main controller 51 can control the alarm device 54 to alarm to promptly remind the staff to carry out inspection and maintenance.

[0083] Preferably, the human body approach detection device 53 is preferably a grating sensor, but not limited thereto.

[0084] In some embodiments, the human proximity detection device 53 serves as a safety sensor to prevent damage caused by human hands entering the device during operation of the device.

[0085] Preferably, the alarm device 54 is a warning light, or a warning light and a buzzer or a horn, but is not limited thereto.

[0086] In order to detect the current output of the battery under different lighting brightness, such as Figure 1 As shown, the main control device 5 is connected to the lighting device 3 through the voltage regulating module 6, and is used to control the output voltage of the voltage regulating module 6, so as to drive the lighting device 3 to work through the adjusted output voltage, and realize the lighting work of different brightness states, so that the current output of the battery cell under different lighting brightness can be detected through the current detection device 2, and the above current output can be externally displayed through the display device 52, so that the user can know the current output of the battery cell under different lighting brightness. Accordingly, the embodiment of the present invention can also detect the current output of different types of battery cells under the same lighting state and display it through the display device 52. The user can intuitively know the current output of different types of battery cells and the comparison between battery cells through the display device 52, and the applicability is strong.

[0087] The present invention adjusts the brightness state of the lighting device 3 by controlling the output voltage of the voltage regulating module 6, so as to simulate different lighting states of sunlight and can adjust the brightness state of the lighting device 3 based on actual needs. By adjusting the brightness state of the lighting device 3, the amount of current flowing through the battery cell when it is illuminated under different brightness states can be detected, so as to better detect the performance of the battery cell.

[0088] In order to realize the displacement of the battery cell, Figure 4 and Figure 6 As shown in FIG. 1 , the displacement driving device 1 includes a first screw rod 11, a screw rod connecting plate 12, a first servo motor 13 and a first servo encoder 14 connected to the first servo motor 13. The first servo motor 13 and the first servo encoder 14 are respectively connected to the main control device 5. The rotating shaft end of the first servo motor 13 is connected to the first screw rod 11 through a coupling. A screw rod connecting plate 12 is sleeved on the first screw rod 11. The first screw rod 11 is threadedly connected to the screw rod connecting plate 12. The screw rod connecting plate 12 is used to fix the battery cell.

[0089] When it is necessary to move the battery cell to the heavy lifting device 4 or to drive the battery cell to reset, the main control device 5 controls the first servo motor 13 to rotate, driving the first screw 11 to rotate, and the screw connecting plate 12 located on the first screw 11 will move forward or backward along the direction of the first screw 11, thereby driving the screw connecting plate 12 and the battery cell thereon to move to the heavy lifting device 4 or reset, realizing the displacement of the battery cell, ensuring the stable operation of the impact resistance performance detection of the battery cell. Among them, the first servo encoder 14 can provide real-time feedback on the movement of the motor to ensure that the first servo motor 13 drives the screw connecting plate 12 to move into place, thereby improving the displacement accuracy.

[0090] In some embodiments, the main control device 5 includes a main controller 51 and multiple slave controllers (not shown, preferably servo drives but not limited thereto), the main controller 51 can send instructions to multiple slave controllers to realize the control of various devices in the performance detection equipment of the battery cell, for example, the first servo motor 13 and other motors are provided with slave controllers, the main controller 51 can send instructions to the slave controllers of the motors to control the operation of the motors, for example, the main controller 51 in the main control device 5 sends instructions to the slave controllers, the slave controllers control the first servo motor 13 to rotate, drive the first screw rod 11 to rotate, the screw rod connecting plate 12 located on the first screw rod 11 will move forward or backward along the direction of the first screw rod 11, thereby driving the screw rod connecting plate 12 and the battery cell thereon to move to the heavy object lifting device 4 or reset, to realize the displacement of the battery cell. In some embodiments, the main controller 51 can also directly control the first servo motor 13 and other motors, and the present invention is not limited to this.

[0091] In order to avoid the situation where the displacement drive device 1 moves excessively and thus causes the equipment to collide and be damaged, Figures 6 to 7As shown, the displacement drive device 1 also includes a first limit sensing mechanism 15, which is connected to the main control device; the first limit sensing mechanism 15 includes a first negative limit position sensor 151, a first origin position sensor 152 and a first positive limit position sensor 153 arranged in sequence along the displacement direction; the first lead screw is provided with a first negative limit position, a first origin position, a heavy object impact position and a first positive limit position in sequence along its displacement direction.

[0092] The present invention can reasonably control the moving range of the displacement drive device 1 by setting the first limit sensing mechanism 15, and control the moving range within the moving range between the first negative limit sensor 151 and the first positive limit sensor 153, so as to facilitate the control of the displacement drive device 1.

[0093] When the device is in the initial state, the screw connecting plate 12 is located at the first origin position or the initial position. The first origin sensor located near the first origin position will sense the screw connecting plate 12 and send an origin detection signal to the main control device to determine that the screw connecting plate 12 is in a normal working state and there is no abnormality. The main control device can control the displacement drive device 1 to drive the screw connecting plate 12 to move to the heavy object impact position, that is, below the heavy object lifting device according to the input control instruction. At this time, the battery cell can be subjected to heavy object impact work; if the screw connecting plate 12 moves excessively due to an abnormal situation, the first positive limit position sensor 153 located near the first positive limit position will detect the positive limit position signal of the screw connecting plate 12 and send it to the main control device. The main control device controls the displacement drive device 1 to stop working or the whole machine to standby work according to the positive limit position signal, and controls the alarm device to send an alarm signal to promptly remind nearby staff to perform inspection and maintenance, and avoid the screw connecting plate 12 from colliding with other structures of the device after exceeding the first positive limit position, thereby improving equipment safety and reducing maintenance costs. When the impact on the battery cell is completed, the main control device can control the displacement drive device 1 to drive the screw connecting plate 12 to reset, that is, move it back to the first origin position, and perform subsequent current detection of the battery cell after the impact; if the screw connecting plate 12 moves excessively due to abnormal conditions, the first negative limit position sensor 151 located near the first negative limit position will detect the negative limit position signal of the screw connecting plate 12 and send it to the main control device. The main control device controls the displacement drive device 1 to stop working or put the whole machine into standby work according to the negative limit position signal, and controls the alarm device to send an alarm signal to promptly remind nearby staff to carry out inspection and maintenance, and avoid the screw connecting plate 12 from colliding with other structures of the equipment after exceeding the first positive limit position, thereby improving equipment safety and reducing maintenance costs.

[0094] Preferably, the first negative limit position sensor 151 , the first origin position sensor 152 , and the first positive limit position sensor 153 are all preferably proximity switches, but are not limited thereto.

[0095] In order to realize the heavy object impact work of the battery cell, such as Figures 8 to 9 As shown, the heavy object lifting device 4 includes an electromagnet 41, a hammer 42, a second screw 43, a screw connecting part 44, a second servo motor 45 and a second servo encoder 46 connected to the second servo motor 45, and the second servo motor 45 and the second servo encoder 46 are respectively connected to the main control device; the rotating shaft end of the second servo motor 45 is connected to the second screw 43 through a coupling, the second screw 43 is sleeved with a screw connecting part 44, and the second screw 43 is threadedly connected to the screw connecting part 44; the bottom of the screw connecting part 44 is provided with an electromagnet 41, and the electromagnet 41 is magnetically connected to the magnetic component 421 on the hammer 42 below. Among them, the main control device is connected to the electromagnet 41 and is used to control the power supply state of the electromagnet 41. When the electromagnet 41 is powered on, the electromagnet 41 acquires magnetism, and it can be magnetically connected to the magnetic component 421, and the screw connecting part 44 is fixedly connected to the hammer 42; when the electromagnet 41 is powered off, the electromagnet 41 loses its magnetism, and it is separated from the magnetic component 421 due to the lack of magnetism, and the screw connecting part 44 is separated from the hammer 42. Under the action of gravity, the hammer 42 performs free fall motion and hits the battery cell below it, thereby realizing the heavy object impact work of the battery cell.

[0096] The present invention configures the heavy object lifting device to include an electromagnet 41, a hammer 42, a second screw 43, a screw connecting part 44, a second servo motor 45 and a second servo encoder 46 connected to the second servo motor 45, so that the heavy object lifting device 4 can be reasonably controlled to move to an ideal position, thereby facilitating heavy object impact work on the battery cell.

[0097] It should be noted that the electromagnet 41 is in a power-on state by default, and the screw rod connection part 44 and the smashing tool 42 are in a high position. When it is necessary to perform a heavy object impact work on the battery cell, the main control device controls the electromagnet 41 to be in a power-off state, at which the electromagnet 41 loses its magnetism, and the smashing tool 42 performs a free fall motion and smashes the battery cell below it, thereby realizing the heavy object impact work of the battery cell. After the heavy object impact work is completed, the main control device controls the second servo motor 45 to rotate, driving the second screw rod 43 to rotate, and the screw rod connection part 44 located on the second screw rod 43 will move downward along the direction of the second screw rod 43, so that the electromagnet 41 on the screw rod connection part 44 is in contact with the magnetic component 421 on the smashing tool 42, and controls the electromagnet 41 to be powered on to be magnetically connected to the magnetic component 421, so as to realize the relative fixation of the screw rod connection part 44 and the smashing tool 42, and then controls the second servo motor 45 to drive the screw rod connection part 44 and the smashing tool 42 to reset, and finally the main control device can perform subsequent lighting and current detection work on the battery cell after the impact. In addition, the heavy lifting device 4 can also be used to perform heavy impact on different types of battery cells, so as to determine which type of battery cell has better impact resistance performance based on the hidden cracks or damage of different types of battery cells after the impact.

[0098] The second servo encoder 46 can provide real-time feedback on the movement of the motor to ensure that the second servo motor 45 drives the screw connecting plate to move into place, thereby improving the lifting accuracy.

[0099] In order to avoid equipment collision and damage due to excessive movement of the lifting device, Figures 8 to 10 As shown, the heavy object lifting device 4 also includes a second limit position sensing mechanism 47, which is connected to the main control device; the second limit position sensing mechanism 47 includes a second negative limit position sensor 471, a second origin position sensor 472, and a second positive limit position sensor 473 arranged in sequence along the lifting direction; the second lead screw is provided with a first negative limit position, a first origin position, a heavy object magnetic attraction position, and a first positive limit position in sequence along its displacement direction. Among them, the working principles of the second negative limit position sensor 471, the second origin position sensor 472, and the second positive limit position sensor 473 are similar to the working principles of the above-mentioned first negative limit position sensor, the first origin position sensor, and a positive limit position sensor, and will not be described in detail here.

[0100] The present invention can reasonably control the moving range of the heavy object lifting device 4 by setting the second limit sensing mechanism 47, and control the moving range within the moving range between the second negative limit sensor 471 and the second positive limit sensor 473, so as to facilitate the control of the heavy object lifting device 4.

[0101] Preferably, the second negative limit position sensor 471 , the second origin position sensor 472 and the second positive limit position sensor 473 are all preferably proximity switches, but are not limited thereto.

[0102] like Fig.11 As shown, Fig.11 The schematic diagram of the structure of the second embodiment of the battery performance detection device of the present invention is shown. Figure 1 The difference from the first embodiment shown is that the displacement drive device 1 further includes an object detection module 7. The object detection module 7 is arranged on the screw connecting plate; the object detection module 7 is connected to the main control device 5, and is used to detect whether there is a battery cell on the screw connecting plate, and send the detected object detection signal to the main control device 5.

[0103] The present invention can detect the presence of a battery cell in real time by arranging the object detection module 7 on the screw connecting plate, so as to facilitate controlling the corresponding device to perform the impact resistance performance detection of the battery cell based on the detection signal of the object detection module 7 .

[0104] When the battery cell needs to be tested for impact resistance, the user places the battery cell to be tested on the screw connecting plate. The user does not need to press the control of the display device (such as the key assembly or the trigger button of the touch screen) to input control instructions, such as impact resistance control instructions or other functional control instructions; at this time, the object detection module 7 will automatically detect the object detection signal of the battery cell and send it to the main control device 5. The main control device 5 will control the corresponding device to perform impact resistance performance testing according to the object detection signal, thereby obtaining the performance evaluation result of the battery cell. The overall operation method is simple. If the object detection module 7 is damaged, the user can also manually input control instructions to the main control device 5 to ensure the stable operation of the equipment.

[0105] Preferably, the object detection module 7 is an infrared detection sensor or a photoelectric sensor, but is not limited thereto.

[0106] like Fig.12 As shown, Fig.12 The schematic diagram of the structure of the third embodiment of the battery performance detection device of the present invention is shown. Figure 1 The difference from the first embodiment shown is that the performance detection device further includes a power switch device 8 and a switch power supply 9. The input end of the power switch device 8 is connected to the external power supply inlet terminal, and the output end of the power switch device 8 is respectively connected to the switch power supply 9, the voltage regulating module 6, the current detection device 2, the displacement drive device 1 and the heavy object lifting device 4 to supply power to the switch power supply 9, the voltage regulating module 6, the current detection device 2, the displacement drive device 1 and the heavy object lifting device 4. The switch power supply 9 is connected to the main control device 5 to supply power to the main control device 5.

[0107] Furthermore, if Fig.13 As shown, the power switch device 8 includes a circuit breaker 81, a power switch component 82, a contactor 83 and a filter 84 connected in sequence, the circuit breaker 81 is connected to the external power supply input terminal, and the filter 84 is respectively connected to the switching power supply 9, the voltage regulating module 6, the current detection device 2, the displacement drive device 1 and the heavy object lifting device 4, so as to output the filtered direct current to the switching power supply 9, the voltage regulating module 6, the current detection device 2, the displacement drive device 1 and the heavy object lifting device 4, so as to ensure that the relevant electrical components are powered on. The power switch component 82 can control the coil of the contactor 83 to be attracted. When the coil is attracted, the contactor 83 will supply power to the subsequent electrical components, and the equipment is powered on at this time.

[0108] The power switch component 82 is preferably a rotary switch, but is not limited thereto.

[0109] The present invention connects the output end of the power switch device 8 with each device in the performance detection equipment of the battery cell, so that power can be supplied to each device so that each device can be in a normal working state.

[0110] like Fig.14 As shown, Fig.14 The present invention shows a method for detecting the performance of a battery cell, which is applied to the performance detection device in the above embodiment, comprising:

[0111] S101, controlling a current detection device to detect a first current amount before and a second current amount after the battery cell is impacted by a heavy object lifting device when the battery cell is illuminated by a lighting device;

[0112] Before the current detection device detects the first current amount before and the second current amount after the battery sheet is impacted by the heavy object lifting device when the battery sheet is illuminated by the lighting device, the method further includes:

[0113] Obtaining a control instruction, where the control instruction is used to instruct a battery cell performance detection operation;

[0114] After the control instruction is obtained, the battery cell is controlled to move to the bottom of the heavy object lifting device and the lighting device is controlled to illuminate the battery cell.

[0115] Specifically, the control instruction is automatically triggered based on the control input of the display device or based on the position detection result of the battery cell by the object detection module provided on the displacement drive device.

[0116] The present invention performs the performance detection operation of the battery cell based on the control instruction control, and can trigger the performance detection operation of the battery cell at an appropriate time to ensure the normal operation of the performance detection operation of the battery cell.

[0117] It should be noted that when it is necessary to test the impact resistance of the battery cell, the user places the battery cell to be tested on the screw connecting plate, and can input the impact resistance control instruction to the main control device through the control on the display device, so that the main control device controls the corresponding device to perform the impact resistance test. Or the user does not need to press the control of the display device (such as the trigger button of the key assembly or the touch screen) to input the control instruction. The object detection module can automatically detect the object detection signal of the battery cell and send it to the main control device. The main control device can control the corresponding device to perform the impact resistance test according to the object detection signal, thereby obtaining the performance evaluation result of the battery cell. The overall operation method is simple. If the object detection module is damaged, the user can also manually input the control instruction to the main control device to ensure the stable operation of the equipment.

[0118] The present invention automatically triggers the control command based on the control input of the display device or the position detection result of the battery cell based on the object detection module set on the displacement drive device. The user can perform the performance detection of the battery cell in an appropriate actual input control command based on actual needs, which can improve the user experience. In addition, when the position of the battery cell meets the requirements, the performance detection of the battery cell can also be automatically triggered, without manual operation, simplifying the detection process and saving detection time.

[0119] S102: Determine the performance of the battery cell based on the detection result of the current detection device.

[0120] Among them, S102 specifically includes:

[0121] The current loss rate is calculated based on the first current amount and the second current amount, and the performance level of the battery cell is determined by comparing the calculated current loss rate with a preset comparison table representing the level of battery cell performance.

[0122] In some embodiments, the main controller of the main control device or at least one of the multiple slave controllers is provided with a memory for storing information, and the memory may pre-store a comparison table of current loss rate and preset levels representing battery cell performance. When the current loss rate is calculated based on the first current amount and the second current amount, the current battery cell performance level may be determined based on the comparison table.

[0123] The present invention controls a current detection device to detect a first current amount before and a second current amount after a battery cell is impacted by a heavy lifting device when the battery cell is illuminated by a lighting device, and judges the performance of the battery cell based on the detection result of the current detection device. It can compare the current loss rate of the battery cell before and after the battery cell is impacted by the heavy lifting device and the impact resistance of the battery cell, and detect the performance of the battery cell more accurately and comprehensively.

[0124] In addition, the present invention calculates the current loss rate based on the first current amount and the second current amount, and determines the level of battery cell performance by comparing the calculated current loss rate with a preset comparison table that characterizes the level of battery cell performance. This can determine the performance of the battery cell being tested, making the test more comprehensive and the test results more intuitive.

[0125] It should be noted that, at the beginning, the first current output by the battery cell before impact under a preset lighting state is obtained, and then the battery cell is moved to a heavy lifting device for heavy object impact work, and then the battery cell after impact is reset, and the second current output by the battery cell after impact under the same lighting state is obtained, so as to facilitate the subsequent determination of the impact resistance of the battery cell according to the change in current before and after the impact.

[0126] Specifically, the main control device performs a performance evaluation process according to the first current amount and the second current amount, and displays the performance evaluation result.

[0127] The step of the main control device performing performance evaluation processing according to the first current and the second current includes:

[0128] Step 1, according to the current performance calculation formula: C = (AB) / A * 100%, calculate the performance test result, wherein A is the first current before the battery cell is impacted, B is the second current after the battery cell is impacted, and C is the performance test result;

[0129] It should be noted that, based on the current performance calculation formula and the first current amount before the battery cell is impacted and the second current amount after the battery cell is impacted, the current loss rate of the battery cell after the impact can be calculated and used as the performance test result.

[0130] Step 2: Pair the performance test results with a preset comparison table representing the level of battery cell performance to obtain a performance evaluation result.

[0131] It should be noted that the preset comparison table for characterizing the level of battery cell performance is divided into a large evaluation level for every 10%, with a total of 10 large evaluation levels, and each large evaluation level includes two small evaluation levels. For example, the current loss rate of 0-5% is the 1A level, the current loss rate of 6-10% is the 1B level, the current loss rate of 11-15% is the 2A level, the current loss rate of 16-20% is the 2B level, the current loss rate of 21-25% is the 3A level, the current loss rate of 26-30% is the 3B level, the current loss rate of 31-35% is the 4A level, the current loss rate of 36-40% is the 4B level, the current loss rate of 41-45% is the 5A level, the current loss rate of 46-50% is the 5B level, the current loss rate of 51-55% is the 6A level, the current loss rate of 56-60% is 6B, current loss rate 61-65% is 7A, current loss rate 66-70% is 7B, current loss rate 71-75% is 8A, current loss rate 76-80% is 8B, current loss rate 81-85% is 9A, current loss rate 86-90% is 9B, current loss rate 91-95% is 10A and current loss rate 96-100% is 10B; wherein, the lower and more advanced the evaluation level to which the current loss rate belongs, the higher the evaluation performance of the battery cell, such as the highest impact resistance performance of the 1A evaluation level. Therefore, by pairing the current loss rate result of the battery cell with the preset comparison table of the level characterizing the performance of the battery cell, the corresponding evaluation level can be obtained, and the high-accuracy evaluation level is displayed as the performance evaluation result, so that the user can intuitively know the impact resistance performance of the measured battery cell.

[0132] like Fig.15 As shown, Fig.15 It is shown that the present invention also provides a method for comparing the performance of a battery cell, which is applied to the performance detection device in the above embodiment, comprising:

[0133] S201, controlling a current detection device to detect a first current amount before and a second current amount after the first battery cell is impacted by a heavy object lifting device when the first battery cell is illuminated by a lighting device;

[0134] S202, controlling the current detection device to detect a third current amount before and a fourth current amount after the second battery cell is impacted by the heavy object lifting device when the second battery cell is illuminated by the lighting device;

[0135] S203 , comparing the performances of the first battery cell and the second battery cell based on the detection result of the current detection device.

[0136] By comparing the performance of two battery cells based on the detection results of the current detection device, the present invention can determine the current loss rate of two different battery cells before and after being impacted by a heavy lifting device and the impact resistance of the battery cells, thereby more accurately and comprehensively detecting the performance of two different battery cells.

[0137] Wherein, comparing the performance of the first battery cell and the second battery cell based on the detection result of the current detection device specifically includes:

[0138] Calculating a first current loss rate based on the first current amount and the second current amount, and determining the performance level of the first battery cell by comparing the calculated first current loss rate with a preset comparison table characterizing the performance level of the first battery cell;

[0139] Calculating a second current loss rate based on the third current amount and the fourth current amount, and comparing the calculated second current loss rate with a preset comparison table characterizing the level of performance of the second battery cell to determine the level of performance of the second battery cell;

[0140] The performance level of the first battery cell and the performance level of the second battery cell are compared to determine the performance of the first battery cell and the second battery cell.

[0141] The present invention calculates the first current loss rate based on the first current and the second current, and calculates the second current loss rate based on the third current and the fourth current, and judges the level of battery cell performance by comparing the two calculated current loss rates with a preset comparison table that characterizes the level of battery cell performance. The performance of the two tested battery cells can be judged, the detection is more comprehensive and the detection results are more intuitive.

[0142] The method further includes: displaying a comparison result of the performances of the first battery cell and the second battery cell on a display device.

[0143] The method of calculating the first current loss rate and the second current loss rate may refer to the above embodiment and will not be described in detail here.

[0144] The above-mentioned battery cell performance comparison method can be used to compare the performance difference between two battery cells. The present invention can intuitively display the comparison result of the performance of the first battery cell and the second battery cell by displaying the comparison result on the display device, so that the user can intuitively understand the performance difference between the two battery cells.

[0145] In summary, the present invention has a simple structure, can perform impact resistance testing on different types of battery cells, has high testing accuracy, and can intuitively display performance evaluation results, making it clear to users at a glance, and has strong applicability.

[0146] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

[0147] In the description of this specification, the description with reference to the terms "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0148] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0149] In addition, any process or method description in the flowchart or otherwise described herein may be understood to represent a module, segment or portion of code that includes one or more executable instructions for performing steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes additional executions in which the functions may not be performed in the order shown or discussed, including performing the functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention belong.

[0150] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for performing logical functions, which can be specifically implemented in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or used in conjunction with these instruction execution systems, devices or apparatuses.

Claims

1. A battery cell performance testing device, characterized in that: It includes a current detection device, a lighting device, a heavy object lifting device and a main control device; The main control device is connected to the lighting device and is used to control the lighting device to illuminate the battery cell; The main control device is connected to the heavy object lifting device and is used to control the heavy object lifting device to perform heavy object impact on the battery cell; The current detection device is used to detect the first current of the battery cell before being impacted by the heavy lifting device and the second current after the impact and send the current detection result to the main control device so that the main control device determines the performance of the battery cell based on the detection result.

2. The performance testing device according to claim 1, characterized in that: The performance detection device further includes a displacement driving device, which is connected to one side of the battery cell or the heavy object lifting device and is used to drive the battery cell or the heavy object lifting device to move along a first direction.

3. The performance testing device according to claim 2, characterized in that: The displacement driving device is used to be connected to one side of the battery sheet, and is used to drive the battery sheet to move to a position adjacent to the lighting device or below the heavy object lifting device.

4. The performance testing device according to claim 1, characterized in that: The main control device includes a main controller and a display device, and the main controller is communicatively connected with the display device.

5. The performance testing device according to claim 1, characterized in that: The main control device is connected to the lighting device via a voltage regulating module, and is used to control the output voltage of the voltage regulating module to adjust the brightness state of the lighting device.

6. The performance testing device according to claim 5, characterized in that: It also includes a power switch device and a switching power supply, the input end of the power switch device is connected to the external power supply input terminal, and the output end of the power switch device is respectively connected to the switching power supply, the voltage regulating module, the current detection device, the displacement drive device and the heavy object lifting device; the switching power supply is connected to the main control device.

7. The performance testing device according to claim 6, characterized in that: The power switch device includes a circuit breaker, a power switch component, a contactor and a filter which are connected in sequence. The circuit breaker is connected to the external power supply input terminal, and the filter is respectively connected to the switching power supply, the voltage regulating module, the current detection device, the displacement drive device and the heavy object lifting device.

8. The performance testing device according to claim 2, characterized in that: The displacement driving device comprises a first screw rod, a screw rod connecting plate, a first servo motor and a first servo encoder connected to the first servo motor, and the first servo motor and the first servo encoder are respectively connected to the main control device; The rotating shaft end of the first servo motor is connected to the first screw rod through a coupling, the screw rod connecting plate is sleeved on the first screw rod, and the first screw rod is threadedly connected to the screw rod connecting plate; The screw connecting plate is used to fix and place the battery sheet.

9. The performance testing device according to claim 8, characterized in that: The displacement driving device further comprises an object detection module, and the object detection module is arranged on the screw rod connecting plate; The object detection module is connected to the main control device, and is used to detect whether the battery sheet is on the screw connecting plate, and send the detected object detection signal to the main control device.

10. The performance testing device according to claim 8, characterized in that: The displacement driving device further comprises a first limit sensing mechanism, and the first limit sensing mechanism is connected to the main control device; The first limit position sensing mechanism comprises a first negative limit position sensor, a first origin position sensor and a first positive limit position sensor which are sequentially arranged along the displacement direction.

11. The performance testing device according to claim 1, characterized in that: The heavy object lifting device comprises an electromagnet, a hammer, a second screw rod, a screw rod connecting part, a second servo motor and a second servo encoder connected to the second servo motor, and the second servo motor and the second servo encoder are respectively connected to the main control device; The rotating shaft end of the second servo motor is connected to the second screw rod through a coupling, the screw rod connecting portion is sleeved on the second screw rod, and the second screw rod is threadedly connected to the screw rod connecting portion; The electromagnet is provided at the bottom of the screw rod connecting part, and the electromagnet is magnetically connected to the magnetic component on the hammer tool below.

12. The performance testing device according to claim 11, characterized in that: The heavy object lifting device further comprises a second limit sensing mechanism, and the second limit sensing mechanism is connected to the main control device; The second limit position sensing mechanism includes a second negative limit position sensor, a second origin position sensor and a second positive limit position sensor which are sequentially arranged along the second direction.

13. The performance testing device according to claim 4, characterized in that: The main control device also includes a human body approach detection device and an alarm device, and the human body approach detection device and the alarm device are electrically connected to the main controller respectively.

14. A method for detecting the performance of a battery cell, characterized in that: include: The current detection device is controlled to detect a first current amount before the battery sheet is impacted by the heavy object lifting device and a second current amount after the impact when the battery sheet is illuminated by the lighting device; The performance of the battery cell is determined based on the detection result of the current detection device.

15. The detection method according to claim 14, characterized in that: Before the current detection device detects the first current amount before and the second current amount after the battery sheet is impacted by the heavy object lifting device when the battery sheet is illuminated by the lighting device, the method further includes: Obtaining a control instruction, wherein the control instruction is used to instruct to perform a performance detection operation of the battery cell; After the control instruction is obtained, the battery cell is controlled to move to the bottom of the heavy object lifting device and the lighting device is controlled to illuminate the battery cell.

16. The performance detection method according to claim 15, characterized in that: The control instruction is input based on a control of the display device or is automatically triggered based on a position detection result of the battery cell by an object detection module provided on the displacement drive device.

17. The performance detection method according to claim 14, characterized in that: The determining the performance of the battery cell based on the detection result of the current detection device specifically includes: The current loss rate is calculated based on the first current amount and the second current amount, and the performance level of the battery cell is determined by comparing the calculated current loss rate with a preset comparison table characterizing the performance level of the battery cell.

18. A method for comparing the performance of a battery cell, applied to the performance testing device according to any one of claims 1 to 13, characterized in that: include: Controlling the current detection device to detect a first current amount before the first battery cell is impacted by the heavy object lifting device and a second current amount after the impact when the first battery cell is illuminated by the lighting device; Controlling the current detection device to detect a third current amount before and a fourth current amount after the second battery cell is impacted by the heavy object lifting device when the second battery cell is illuminated by the lighting device; The performances of the first battery cell and the second battery cell are compared based on the detection result of the current detection device.

19. The performance comparison method according to claim 18, characterized in that: The comparing the performance of the first battery cell and the second battery cell based on the detection result of the current detection device specifically includes: Calculating a first current loss rate based on the first current amount and the second current amount, and determining the performance level of the first battery cell by comparing the calculated first current loss rate with a preset comparison table characterizing the performance level of the first battery cell; Calculating a second current loss rate based on the third current amount and the fourth current amount, and determining the performance level of the second battery cell by comparing the calculated second current loss rate with a preset comparison table characterizing the performance level of the second battery cell; The performance of the first battery cell and the second battery cell are determined by comparing the performance level of the first battery cell and the performance level of the second battery cell.

20. The performance comparison method according to claim 19, characterized in that: Also includes: The comparison result of the performance of the first battery cell and the second battery cell is displayed on a display device.

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