Battery cell detection device

Abstract

The utility model discloses a battery cell detection device, and relates to the technical field of battery production. The battery cell detection device comprises a detection box and a plurality of pressurization assemblies, the detection box is provided with side walls extending in the height direction of the battery cell detection device, the side walls are arranged at intervals in the width direction of the battery cell detection device, a containing cavity is formed between the side walls, the pressurization assemblies are arranged in the containing cavity and detachably connected with the side walls, and clamping spaces are formed in the pressurization assemblies. The clamping space can clamp the to-be-detected battery cell to simulate the working condition that the plurality of battery cells are pressed in the battery module, so that the voltage drop of the battery cells in unit time can be measured when pressure is applied to the battery cells. Therefore, the measured voltage drop of the battery cell in unit time is in the environment in the battery module where the battery cell is simulated, so that the measured detection value of the battery cell is more accurate, and the actual production requirement is better met.

Description

Technical Field

[0001] This application belongs to the technical field of battery production, and particularly relates to a cell detection device. Background Art

[0002] Lithium-ion batteries have been widely applied to new energy vehicles, energy storage systems and other fields due to their high energy density and long service life. However, when individual cells are assembled into battery modules and battery packs, the consistency of the self-discharge rate of individual cells is an important factor affecting the performance of the battery pack. Therefore, it is necessary to detect the self-discharge rate of individual cells.

[0003] In related technologies, generally, the cells are screened and graded by testing the K value (voltage drop per unit time) of the cells. Usually, the individual cells are adjusted to a certain state of charge, left standing at room temperature for a certain period of time, and then the cells with abnormal voltage drops are screened out. However, it usually detects the cells in a freely placed state, which has a large difference from the actual application environment and is likely to cause inaccurate test results. Utility Model Content

[0004] This application aims to provide a cell detection device, which can solve the problem that the test environment has a large difference from the actual application environment and is likely to cause inaccurate test results.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of this application provides a cell detection device, including: a detection box and a plurality of pressurizing components; the detection box is provided with side walls extending along the height direction of the cell detection device, and the side walls are spaced along the width direction of the cell detection device, and a receiving cavity is formed between the side walls. A plurality of the pressurizing components are arranged in the receiving cavity, and the plurality of pressurizing components are detachably connected to the side walls. A clamping space is formed in the pressurizing component, and the clamping space is used for storing the cell to be detected, and the pressurizing component applies pressure to the cell to be detected to assist in the detection of the cell.

[0007] Optionally, the pressurizing component includes: a base, a bearing plate, a driving component and a pressurizing plate. The base is detachably connected to the side wall, the bearing plate is fixedly connected to the base, the pressurizing plate is movably connected to the base, and the clamping space is formed between the pressurizing plate and the bearing plate; the driving component is arranged on the base and connected to the pressurizing plate for driving the pressurizing plate to move relative to the bearing plate to adjust the size of the clamping space.

[0008] Optionally, the pressing assembly further includes a guide member disposed on the base. A guide hole is provided in the pressing plate, and the guide member passes through the guide hole. The pressing plate is movable along the guide member to approach or move away from the bearing plate.

[0009] Optionally, the driving assembly includes a driving member and a transmission member. The transmission member is connected to the pressing plate, and the driving member is connected to the transmission member for driving the transmission member to move so as to drive the pressing plate to approach or move away from the bearing plate.

[0010] Optionally, the transmission member is a screw rod, and the driving member is a rotary handle. A threaded hole is provided in the base, the screw rod is rotatably connected in the threaded hole, one end of the screw rod is connected to the pressing plate, and the rotary handle is connected to the other end of the screw rod.

[0011] Optionally, a locking member is provided between the transmission member and the base, and the locking member is used to lock the relative positions of the transmission member and the base.

[0012] Optionally, the pressing assembly further includes a pressure measuring member and a movable plate. The guide member passes through the movable plate so that the movable plate can slide along the guide member. The pressing plate, the movable plate, and the bearing plate are arranged in sequence along the guide member. The pressure measuring member is clamped between the bearing plate and the movable plate and is used to detect the pressure received by the battery cell.

[0013] Optionally, a slide rail is provided on one side of the side wall facing the accommodating cavity, and the base is slidably connected to the slide rail.

[0014] Optionally, a partition is further provided in the detection box. The partition is spaced along the width direction of the battery cell detection device to divide the accommodating cavity into a plurality of sub-accommodating spaces, and the pressing assembly is provided in each sub-accommodating space.

[0015] Optionally, a temperature regulating mechanism is further included. The temperature regulating mechanism is disposed at the bottom of the detection box and is used to regulate the temperature of the accommodating cavity.

[0016] In an embodiment of the present application, the battery cell detection device includes a detection box and a plurality of pressurizing components. The detection box is provided with side walls extending in the height direction of the battery cell detection device, and the side walls are spaced apart in the width direction of the battery cell detection device. An accommodation cavity is formed between the side walls. The plurality of pressurizing components are arranged in the accommodation cavity and are detachably connected to the side walls. A clamping space is formed inside the pressurizing component, and the clamping space can clamp the battery cell to be detected to simulate the working condition of multiple battery cells being pressurized in the battery module, so that the voltage drop per unit time of the battery cell can be measured when pressure is applied. In this way, the voltage drop per unit time of the battery cell measured is in the environment of the battery module where the battery cell is simulated, so that the measured battery cell detection value is more accurate and more in line with the actual production requirements.

[0017] Additional aspects and advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The advantages of the present application will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 is a partial schematic view of a battery cell detection device according to an embodiment of the present application;

[0020] Figure 2 is a schematic view of a battery cell detection device according to an embodiment of the present application;

[0021] Figure 3 is a schematic view of the battery cell detection device from another perspective according to an embodiment of the present application;

[0022] Figure 4 is a schematic view of a pressurizing component according to an embodiment of the present application;

[0023] Figure 5 is a schematic view of the pressurizing component from another perspective according to an embodiment of the present application.

[0024] REFERENCE SIGNS:

[0025] 1: Detection box; 11: Accommodation cavity; 111: Sub-accommodation space; 12: Slide rail; 13: Partition board; 2: Pressurizing component; 21: Clamping space; 22: Base; 23: Bearing plate; 24: Driving component; 241: Driving member; 242: Transmission member; 2421: Locking member; 25: Pressurizing plate; 251: Guide hole; 26: Guide member; 27: Pressure measuring member; 28: Movable plate; 3: Temperature regulating mechanism; 4: Battery cell; X: Width direction of the battery cell detection device; Y: Thickness direction of the battery cell detection device; Z: Height direction of the battery cell detection device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where like or similar reference numerals denote like or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary only for explaining the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0027] The terms "first" and "second" in the description and claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more. In addition, "and / or" in the description and claims means at least one of the connected objects. The character " / " generally indicates an "or" relationship between the associated objects before and after.

[0028] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present application.

[0029] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0030] Before introducing the cell detection device provided by the embodiments of the present application in detail, the specific application scenarios of the cell detection device will be specifically described:

[0031] After the cell capacity is divided, store the cell that has just completed the capacity division for a few days, use a voltage resistance meter to measure the open circuit voltage (OCV) of the cell, and record the voltage value as OCV1. Then, store the cell in a free state at room temperature for a few days, use a voltage resistance meter to measure the OCV of the cell, and record the voltage value measured this time as OCV2. Record the time between measuring OCT1 and OCV2 as △T, and calculate the K value of the cell, K=(OCV1-OCV2) / △T.

[0032] However, when the cells with measured K values ​​are connected in series or in parallel to form a battery module, the cells in the battery module may be under pressure, that is, the cells in the battery module are not in a free state at room temperature. Therefore, there may still be deviations in the K values ​​of individual cells in the battery module, that is, the measured K values ​​of the cells are not accurate enough, resulting in insufficient consistency of the cells in the battery module, which affects the use of the battery module. In order to solve this problem, the present application proposes a cell detection device.

[0033] The battery cell detection device provided in the embodiment of the present application is described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0034] Reference Figures 1 to 2 According to some embodiments of the present application, the battery cell detection device includes: a detection box 1 and a plurality of pressurizing components 2; the detection box 1 is provided with side walls extending along the height direction of the battery cell detection device, and the side walls are arranged at intervals along the width direction of the battery cell detection device, and a receiving cavity 11 is formed between the side walls, and a plurality of pressurizing components 2 are arranged in the receiving cavity 11, and the plurality of pressurizing components 2 are detachably connected to the side walls, a clamping space 21 is formed in the pressurizing component 2, the clamping space is used to store the battery cell 4 to be detected, and the pressurizing component 2 applies pressure to the battery cell 4 to be detected to assist in the detection of the battery cell 4.

[0035] In the embodiment of the present application, the battery cell detection device includes a detection box 1 and a plurality of pressurizing components 2. The detection box 1 is provided with side walls extending in the height direction of the battery cell detection device, and the side walls are arranged at intervals in the width direction of the battery cell detection device, and a receiving cavity 11 is formed between the side walls. A plurality of pressurizing components 2 are arranged in the receiving cavity 11 and are detachably connected to the side walls. A clamping space 21 is formed in the pressurizing component 2. The clamping space 21 can clamp the battery cell 4 to be detected to simulate the working condition of multiple battery cells 4 under pressure in the battery module, so that the voltage drop per unit time of the battery cell 4 can be measured when pressure is applied. The voltage drop per unit time of the battery cell measured in this way is the environment in the battery module where the battery cell simulates, so that the measured battery cell detection value is more accurate and more in line with actual production needs.

[0036] In specific applications, refer to Figure 2, the battery cell detection device has a height direction Z, a width direction X, and a thickness direction Y that are perpendicular to each other. The detection box 1 has side walls extending along the height direction Z of the battery cell detection device, and the side walls are spaced apart along the width direction X of the battery cell detection device. Along the thickness direction Y of the battery cell detection device, the detection box is correspondingly provided with a rear wall and a door. Along the height direction Y of the battery cell detection device, the detection box 1 has an opposite box top (not shown in the figure) and a box bottom, thus forming a receiving cavity 11. Of course, in addition to the side walls spaced along the width direction of the battery cell detection device, other box walls can be set according to requirements, and the embodiments of the present application do not limit this.

[0037] It can be understood that the number of the plurality of pressing components 2 is set according to the size of the internal space of the receiving cavity 11, and it is sufficient to place the plurality of pressing components 2 in the receiving cavity 11. The pressing component 2 is detachably connected to the side wall, and specifically, it can be snap connection, pin connection, bolt connection, etc. Those skilled in the art can select according to actual needs, and the embodiments of the present application do not limit this.

[0038] In some embodiments of the present application, please refer to Figure 4 , the pressing component 2 includes: a base 22, a bearing plate 23, a driving component 24, and a pressing plate 25. The base 22 is detachably connected to the side wall, the bearing plate 23 is fixedly connected to the base 22, the pressing plate 25 is movably connected to the base 22, and a clamping space 21 is formed between the pressing plate 25 and the bearing plate 23; the driving component 24 is arranged on the base 22 and connected to the pressing plate 25 for driving the pressing plate 25 to move relative to the bearing plate 23 to adjust the size of the clamping space 21.

[0039] In the embodiments of the present application, the base 22 is detachably connected to the side wall, which is convenient for replacing the battery cell 4 inside the pressing component 2; the bearing plate 23 is fixedly connected to the base 22, the pressing plate 25 is movably connected to the base 22, and a clamping space 21 is formed between the pressing plate 25 and the bearing plate 23, so that it is convenient to place the battery cell 4 in the clamping space 21. The driving component 24 is arranged on the base 22 and connected to the pressing plate 25. By the driving component 24, the pressing plate 25 can be driven to move relative to the bearing plate 23, thereby adjusting the size of the clamping space 21, and further applying a preset pressure to the battery cell 4 in the clamping space 21 to simulate the pressure-bearing situation of the battery cell 4 in the battery module.

[0040] In a specific application, one end of the bearing plate 23 is fixedly connected to the base 25 and abuts against the battery cell 4 when the battery cell 4 is under pressure. The bearing plate 23 can also be integrally formed with the base 25, which is convenient for processing while improving the structural strength.

[0041] Understandably, the pressing plate 25 is movably connected to the base 22, and a clamping space 21 is formed between the pressing plate 25 and the bearing plate 23. When the pressing plate 25 moves towards the bearing plate 23, the clamping space 21 becomes smaller to apply a preset pressure to the battery cell 4; when the pressing plate 25 moves away from the bearing plate 23, the clamping space 21 becomes larger, facilitating the storage or replacement of the battery cell 4 in the clamping space 21.

[0042] Understandably, the driving source of the driving assembly 24 can be pneumatic driving, electric driving, etc., and those skilled in the art can select according to actual needs, and the embodiments of the present application do not limit this.

[0043] In some embodiments of the present application, referring to Figure 4 , the pressing assembly 2 further includes a guiding member 26. The guiding member 26 is disposed on the base 22, a guiding hole 251 is provided in the pressing plate 25, and the guiding member 26 passes through the guiding hole 251, and the pressing plate 25 can move along the guiding member 26 to approach or move away from the bearing plate 23.

[0044] In the embodiments of the present application, a guiding member 26 is disposed on the base 22, a guiding hole 251 is provided in the pressing plate 25, and the guiding member 26 passes through the guiding hole 251, so that the pressing plate 25 can move along the guiding member 26; in this way, the pressing plate 25 will not be deflected during the process of approaching or moving away from the bearing plate 23, and the pressure applied to the battery cell 4 in the clamping space 21 is more balanced.

[0045] Understandably, one end of the guiding member 26 facing the bearing plate 23 is fixedly connected to the bearing plate, so that the guiding member 26 forms a stable track, and the pressing plate 25 moves more smoothly along the guiding member 26.

[0046] In a specific application, the number of guiding members 26 can be set to be multiple, and the multiple guiding members 26 are spaced apart on the base 22. Correspondingly, a plurality of guiding holes 251 are provided at corresponding positions on the pressing plate 25, and each guiding member 26 passes through one guiding hole 251. Thereby further improving the stability of the pressing plate 25 during movement, and at the same time making the pressure applied by the pressing plate 25 to the battery cell 4 more balanced.

[0047] In some embodiments of the present application, referring to Figure 4 , the driving assembly 24 includes a driving member 241 and a transmission member 242. The transmission member 242 is connected to the pressing plate 25, and the driving member 241 is connected to the transmission member 242 for driving the transmission member 242 to move, so as to drive the pressing plate 25 to approach or move away from the bearing plate 23.

[0048] In the embodiments of the present application, the transmission member 242 is connected to the pressing plate 25, and the driving member 241 is connected to the transmission member 242. Thus, under the drive of the driving member 241, the transmission member 242 drives the pressing plate 25 to move closer to or away from the bearing plate 23, so as to apply pressure to the battery cell 4 to simulate the stressed state of the battery cell 4 in the battery module, or to open the clamping space 21 to store or replace the battery cell 4.

[0049] In a specific application, the transmission member 242 can be a lead screw, a rack, etc., and those skilled in the art can select according to actual needs, and the embodiments of the present application do not limit this. Correspondingly, the driving member 241 can be a rotary handle, a motor with a gear, etc., and those skilled in the art can select according to actual needs, and the embodiments of the present application do not limit this.

[0050] It can be understood that the specific selection of the transmission member 242 and the driving member 241 is determined according to the overall dimensions of the accommodation cavity 11 and the pressing assembly 2 and the pressure to be applied. On the premise of being able to apply a preset pressure to the battery cell 4, it is better to occupy as little space as possible and be more stable.

[0051] In some embodiments of the present application, referring to Figure 4 , the transmission member 242 is a screw rod, the driving member 241 is a rotary handle, a threaded hole is provided in the base 22, the screw rod is rotatably connected in the threaded hole, one end of the screw rod is connected to the pressing plate 25, and the rotary handle is connected to the other end of the screw rod.

[0052] In the embodiments of the present application, the screw rod is rotatably connected in the threaded hole in the base 22, one end of the screw rod is connected to the pressing plate 25, and the other end is connected to the rotary handle. In this way, the user rotates the rotary handle to move the screw rod, thereby driving the pressing plate 25 to move closer to or away from the bearing plate 23, so as to apply pressure to the battery cell 4 to simulate the stressed state of the battery cell 4 in the battery module, or to open the clamping space 21 to store or replace the battery cell 4. Applying pressure to the battery cell 4 is achieved with a simple structure, and the structure is more stable and easy to repair.

[0053] It can be understood that when the user rotates the rotary handle to drive the screw rod to rotate, the screw rod meshes with the threaded hole in the base 22, thereby converting the rotary motion into a linear motion, and driving the pressing plate 25 to move closer to or away from the bearing plate 23.

[0054] In some embodiments of the present application, referring to Figure 4 , a locking member 2421 is provided between the transmission member 242 and the base 22, and the locking member 2421 is used to lock the relative positions of the transmission member 242 and the base 22.

[0055] In the embodiment of the present application, a locking member 2421 is provided between the transmission member 242 and the base 22. After the user presses the pressing plate 25 against the battery cell 4 with a preset pressure through the driving member 241, it is necessary to stand still for a period of time. At this time, the position between the transmission member 242 and the base 22 is restricted by the locking member 2421, so as to prevent the transmission member 242 and the base 22 from moving, and the pressure applied to the battery cell 4 changes, improving the accuracy of the battery cell detection result.

[0056] It can be understood that after the pressing plate 25 applies a preset pressure to the battery cell 4, it is necessary to stand still for a period of time with the battery cell 4 under pressure. During this period, the locking member 2421 locks the transmission member 242 and the base 22 to prevent relative movement between the transmission member 242 and the base 22 and reduce the pressure applied to the battery cell 4.

[0057] In some embodiments of the present application, please refer to Figure 4 and Figure 5 , the pressing assembly 2 further includes a pressure measuring member 27 and a movable plate 28; the guiding member 26 passes through the movable plate 28 so that the movable plate 28 can slide along the guiding member 26, and the pressing plate 25, the movable plate 28 and the bearing plate 23 are sequentially arranged along the guiding member 26, and the pressure measuring member 27 is clamped between the bearing plate 23 and the movable plate 28 and is used to detect the pressure received by the battery cell 4.

[0058] In the embodiment of the present application, along the extending direction of the guiding member 26, the pressing plate 25, the movable plate 28 and the bearing plate 23 are sequentially arranged. Thus, when the pressing plate 25 applies pressure to the battery cell 4, it drives the movable plate 28 to abut against the bearing plate 23, and a pressure measuring member 27 is arranged between the movable plate 28 and the bearing plate 23. In this way, the user can know how much pressure is applied when pressing, improving the convenience of using the battery cell detection device.

[0059] It can be understood that the pressure measuring member 27 includes but is not limited to: a pressure gauge, a pressure sensor, etc. Those skilled in the art can select according to actual needs, and the embodiments of the present application do not limit this.

[0060] In a specific application, the pressure measuring member 27 is fixed on the bearing plate 23. When the pressing plate 25 applies pressure to the battery cell, the applied pressure is transmitted to the movable plate 28, and finally the pressure measuring member 27 measures the pressure borne by the movable plate 28, so that the user can know the magnitude of the applied pressure.

[0061] It can be understood that the magnitude of the applied pressure is related to the battery cell 4 and the battery module assembled from the battery cell 4. Specifically, the pressure value range is 5000N to 50000N. Those skilled in the art can select according to actual needs, and the present application does not limit this.

[0062] In some embodiments of the present application, the pressurizing assembly 2 further includes a plurality of partition plates. A plurality of battery cells 4 are stored in the clamping space 21. Before the pressing plate 25 applies pressure to the battery cells 4, each partition plate is placed between two adjacent battery cells 4 to provide a certain protection for the battery cells 4 and prevent the adjacent battery cells 4 from being damaged due to pressure.

[0063] In some embodiments of the present application, refer to Figure 2 and Figure 3 , a slide rail 12 is provided on one side of the side wall facing the accommodating cavity 11, and the base 22 is slidably connected to the slide rail 12.

[0064] In an embodiment of the present application, a slide rail 12 is provided on one side of the side wall of the detection box 1 facing the accommodating cavity 11, and the base 22 is slidably connected to the slide rail 12, so as to facilitate the user to store or replace the battery cells 4 in the clamping space 21, improving the usability of the battery cell detection device.

[0065] It can be understood that the base 22 is slidably connected to the slide rail 12. When the user needs to place or replace the battery cells 4, the pressurizing assembly 2 can be pulled out from the detection box 1 for placement or replacement, which is more convenient to use. Of course, the pressurizing assembly 2 can also be completely pulled out of the detection box 1 along the slide rail 12 to facilitate the user's use.

[0066] In some embodiments of the present application, refer to Figure 3 , a partition plate 13 is further provided in the detection box 1. The partition plates 13 are spaced along the width direction Y of the battery cell detection device to divide the accommodating cavity 11 into a plurality of sub-accommodating spaces 111, and each sub-accommodating space 111 is provided with a pressurizing assembly 2.

[0067] In an embodiment of the present application, a plurality of partition plates 13 are spaced in the width direction Y of the battery cell detection device, so as to divide the accommodating cavity 11 into a plurality of sub-accommodating spaces 111, and each sub-accommodating space 111 is provided with a pressurizing assembly 2, increasing the number of pressurizing assemblies 2 accommodated in the accommodating cavity 11. In this way, multiple groups of pressurizing tests can be carried out simultaneously in a battery cell detection device, improving the efficiency of battery cell detection.

[0068] In a specific application, along the height direction Z of the battery cell detection device, a plurality of slide rails 12 are spaced on both sides of each partition plate 13, and the positions of the slide rails 12 are corresponding and flush with the positions of the slide rails on the adjacent side walls or partition plates 13. In this way, a plurality of pressurizing assemblies 2 can be placed in each sub-accommodating space 111.

[0069] In some embodiments of the present application, please refer to Figure 2 and Figure 3 , the battery cell detection device further includes a temperature regulating mechanism 3. The temperature regulating mechanism 3 is provided at the bottom of the detection box 1 for regulating the temperature of the accommodating cavity 11.

[0070] In the embodiment of the present application, a temperature adjusting mechanism 3 is provided at the bottom of the detection box 1 to adjust the temperature of the accommodation cavity 11, so that the battery cells 4 in the pressurizing assembly 2 are in the temperature environment in the battery module, so as to simulate the temperature environment of the battery cells 4 in the battery module and then perform detection, improving the accuracy of the detection result.

[0071] It can be understood that the temperature adjusting mechanism 3 can adjust the temperature in the accommodation cavity 11 to rise or fall, so as to conveniently simulate the different temperature environments of the battery cells 4 in the battery module. In this way, on the one hand, the pressurizing assembly 2 applies pressure to the battery cells 4, and on the other hand, the temperature adjusting mechanism 3 adjusts the ambient temperature of the battery cells 4, making the ambient environment when the battery cells 4 are detected approximate to the actual working condition. As a result, the K values of the selected battery cells 4 still have high consistency after being assembled into a battery module, improving the accuracy of battery cell detection.

[0072] In a specific application, when the temperature adjusting mechanism 3 adjusts the temperature in the accommodation cavity 11 to rise, the temperature in the accommodation cavity 11 can reach 40°C to 65°C; when the temperature adjusting mechanism 3 adjusts the temperature in the accommodation cavity 11 to fall, the temperature in the accommodation cavity 11 can reach -40°C to 10°C; for the selection of specific temperature values, those skilled in the art can set them according to actual needs, and the present application does not limit this.

[0073] The following briefly describes the use process of the battery cell detection device in the embodiment of the present application:

[0074] Under normal temperature and pressure, 50 battery cells 4 are adjusted to a 70% state of charge (SOC). The 50 battery cells 4 are placed in the clamping space 21 in the pressurizing assembly 2. The rotating handle is rotated to drive the pressure plate 25 to apply pressure to the battery cells 4 along the guide member 26 by means of the screw rod. Referring to the pressure value display on the pressure measuring member 27, a pressure of 30,000 N is applied to the battery cells, and OCV1 is measured. The measurement time point is recorded as t1; the 50 battery cells 4 are left standing at normal temperature (25°C) for 4 days, and then OCV2 is measured. The measurement time point is recorded as t2, and K1 = (OCV1 - OCV2) / (t2 - t1); the battery cells 4 with poor self-discharge at normal temperature are screened out.

[0075] After screening out the cells 4 with abnormal self-discharge at normal temperature, the remaining cells 4 are put back into the clamping space 21, and the OCV3 of the remaining cells 4 is measured again. The measurement time point is recorded as t3, and the pressurizing component 1 is put back into the detection box 1. The temperature in the accommodation cavity 11 is adjusted by the temperature regulating mechanism 3. Preferably, it is set to 45 °C. After standing for 3 days at this temperature, the cells 4 are measured, the measurement result is recorded as OCV4, and the measurement time is recorded as t4. The K value of the cells at high temperature is calculated; K2 = (OCV3 - OCV4) / (t4 - t3), and then the cells 4 with abnormal self-discharge at high temperature are screened out. In this way, by simulating the actual working conditions of the cells 4 in the battery module, cells 4 with high K value consistency are obtained. After assembling these cells 4 into a battery module, the probability of abnormal voltage drop is greatly reduced, and the production quality is improved.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. 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.

[0077] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery cell detection device, characterized in that: include: A detection box (1) and a plurality of pressurizing components (2); the detection box (1) is provided with side walls extending in the height direction of the battery cell detection device, and the side walls are arranged at intervals in the width direction of the battery cell detection device, and a receiving cavity (11) is formed between the side walls, a plurality of pressurizing components (2) are arranged in the receiving cavity (11), and a plurality of pressurizing components (2) are detachably connected to the side walls, a clamping space (21) is formed in the pressurizing component (2), the clamping space is used to store the battery cell (4) to be detected, and the pressurizing component (2) applies pressure to the battery cell (4) to be detected to assist in the detection of the battery cell (4).

2. The battery cell detection device according to claim 1, characterized in that: The pressurizing component (2) comprises: a base (22), a pressure plate (23), a driving component (24) and a pressurizing plate (25); the base (22) is detachably connected to the side wall; the pressure plate (23) is fixedly connected to the base (22); the pressurizing plate (25) is movably connected to the base (22); the clamping space (21) is formed between the pressurizing plate (25) and the pressure plate (23); the driving component (24) is arranged on the base (22) and connected to the pressurizing plate (25), and is used to drive the pressurizing plate (25) to move relative to the pressure plate (23) to adjust the size of the clamping space (21).

3. The battery cell detection device according to claim 2, characterized in that: The pressurizing assembly (2) further comprises a guide member (26), wherein the guide member (26) is arranged on the base (22), a guide hole (251) is arranged in the pressurizing plate (25), the guide member (26) is passed through the guide hole (251), and the pressurizing plate (25) can move along the guide member (26) to approach or move away from the pressure plate (23).

4. The battery cell detection device according to claim 2, characterized in that: The driving assembly (24) comprises a driving member (241) and a transmission member (242), wherein the transmission member (242) is connected to the pressure plate (25), and the driving member (241) is connected to the transmission member (242) for driving the transmission member (242) to move, so as to drive the pressure plate (25) to approach or move away from the pressure plate (23).

5. The battery cell detection device according to claim 4, characterized in that: The transmission member (242) is a screw rod, the driving member (241) is a rotating handle, a threaded hole is provided in the base (22), the screw rod is rotatably connected in the threaded hole, one end of the screw rod is connected to the pressure plate (25), and the rotating handle is connected to the other end of the screw rod.

6. The battery cell detection device according to claim 4, characterized in that: A locking member (2421) is provided between the transmission member (242) and the base (22), and the locking member (2421) is used to lock the relative position of the transmission member (242) and the base (22).

7. The battery cell detection device according to claim 3, characterized in that: The pressurizing assembly (2) further comprises a pressure measuring member (27) and a movable plate (28); The guide member (26) is inserted into the movable plate (28) so that the movable plate (28) can slide along the guide member (26); the pressure plate (25), the movable plate (28) and the pressure-bearing plate (23) are arranged in sequence along the guide member (26); the pressure measuring member (27) is clamped between the pressure-bearing plate (23) and the movable plate (28) and is used to detect the pressure applied to the battery cell (4).

8. The battery cell detection device according to claim 2, characterized in that: A slide rail (12) is provided on the side of the side wall facing the accommodating cavity (11), and the base (22) is slidably connected to the slide rail (12).

9. The battery cell detection device according to any one of claims 1 to 8, characterized in that: The detection box (1) is further provided with a partition (13), the partition (13) being arranged at intervals along the width direction of the battery cell detection device to divide the accommodating chamber (11) into a plurality of sub-accommodating spaces (111), each of the sub-accommodating spaces (111) being provided with the pressurizing assembly (2).

10. The battery cell detection device according to claim 1, characterized in that: It also comprises a temperature adjustment mechanism (3), which is arranged at the bottom of the detection box (1) and is used to adjust the temperature of the accommodating cavity (11).

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