Lithium battery sorting device and sorting method

Abstract

The present invention relates to the technical field of battery sorting equipment, and specifically to a lithium battery sorting equipment and a sorting method, including a frame and a sorting device, wherein the sorting device is installed on the frame through a mounting table, and the sorting device includes a sorting disk rotatably connected to the mounting table, and the surface of the sorting disk is provided with a measuring compartment for loading lithium batteries; the sorting method includes the following steps, firstly, the lithium battery is loaded onto a measuring mechanism and electrically connected to a charging and discharging device, then the lithium battery is measured by the measuring mechanism to obtain measurement data, and finally the comprehensive performance of the lithium battery is calculated based on the measurement data. The present invention can measure multiple performance parameters of a lithium battery at the same time, and can sort the lithium battery according to the specifications of a single parameter, and can also calculate the comprehensive performance of the lithium battery based on the measured parameter data, and then sort the lithium battery based on the comprehensive performance, so as to further improve the consistency of the performance sorting of the lithium battery.

Description

Technical Field

[0001] The present invention relates to the technical field of battery sorting equipment, and in particular to a lithium battery sorting equipment and a sorting method. Background Art

[0002] With the widespread application of lithium batteries in the field of energy storage, the performance requirements for lithium batteries are getting higher and higher. The voltage, capacity and internal resistance of lithium batteries are key parameters to measure their performance. In order to ensure the performance consistency of lithium batteries, the batteries need to be accurately sorted.

[0003] The prior art discloses a patent application with application number CN201810786740.0, titled "A lithium battery consistency sorting device", which specifically discloses a technical solution of "a lithium battery consistency sorting device, comprising a feeding mechanism, a detection mechanism, a sorting mechanism and a collecting mechanism, characterized in that: the feeding mechanism comprises a cell box for placing lithium batteries, a discharge port is provided on one side of the cell box, a feeding channel is connected to the discharge port, and a feeding conveyor belt is provided at the bottom of the feeding channel along the length direction of the feeding channel".

[0004] The above scheme transports the lithium battery into the detection mechanism, the tester tests the relevant electrical parameter values ​​of the lithium battery, and the controller records them. After that, the lithium battery continues to rotate with the turntable, and the controller selects the corresponding sorting channel according to the electrical parameter classification interval corresponding to the electrical parameter value of the lithium battery, thereby realizing automatic sorting operation of the lithium battery.

[0005] In the above technology, although the relevant electrical parameters of lithium batteries can be tested, the comprehensive performance of lithium batteries cannot be divided by simple tests during the measurement process. Important parameters include voltage, capacity and internal resistance, and the relationship between the three is interrelated. There are certain limitations in the measurement and division of a single performance, and it is impossible to accurately sort lithium batteries according to their comprehensive performance. Therefore, a lithium battery sorting device and a sorting method are proposed to solve the above problems. Summary of the invention

[0006] Technical issues solved:

[0007] In view of the above-mentioned shortcomings of the prior art, the present invention provides a lithium battery sorting device and a sorting method, which can solve the problem in the prior art that lithium batteries cannot be sorted according to their comprehensive performance of voltage, capacity and internal resistance.

[0008] Technical Solution

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0010] The present invention provides a lithium battery sorting device, comprising a frame and a sorting device, wherein the sorting device is mounted on the frame through a mounting platform, the sorting device comprises a sorting plate rotatably connected to the mounting platform, the surface of the sorting plate is provided with a measuring chamber for loading lithium batteries, the measuring chambers are arranged into a plurality of groups, and the plurality of groups of measuring chambers are distributed in equal distance circles; a measuring mechanism, the measuring mechanism is mounted in the measuring chamber and is used to detect the voltage, capacity and internal resistance of the lithium battery, the measuring mechanism comprises a negative electrode conductive sheet and a positive electrode conductive sheet mounted in the measuring chamber, the negative electrode conductive sheet and the positive electrode conductive sheet are respectively used to be connected to the positive and negative electrodes of the lithium battery, a charging and discharging device, a load and a measuring device are mounted on the sorting plate, the charging and discharging device is electrically connected to the negative electrode conductive sheet and the positive electrode conductive sheet through a conductive wire 1, the measuring device is electrically connected to the negative electrode conductive sheet and the positive electrode conductive sheet through a conductive wire 2, and the load is connected in series between the lithium battery and the charging and discharging device when used for internal resistance measurement;

[0011] The mounting platform is configured as a plurality of groups mounted on a frame in a forked diffusion structure, and each of the mounting platforms is provided with a plurality of groups of conveying plates, wherein one group of the conveying plates is used for inputting lithium batteries into the measuring chamber.

[0012] Furthermore, a second motor is installed on the mounting platform, and the second motor is rotatably connected to the sorting disc.

[0013] Furthermore, a slide groove is provided on the sorting disk, and the measuring mechanism includes a pressure plate slidably installed in the slide groove, the pressure plate is installed in the measuring bin and is located above the support platform, and a screw rod parallel to the slide groove is also installed inside the sorting disk, and the pressure plate is adaptively installed on the screw rod, and a motor 1 is installed inside the sorting disk, and the output shaft of the motor 1 is transmission-connected to the screw rod.

[0014] Furthermore, a support platform is installed on the lower end surface of the measuring chamber through a spring, and the lowermost end plane of the conveying plate used to input lithium batteries is higher than the upper surface of the support platform.

[0015] Furthermore, the negative electrode conductive sheet is arranged on a support table, and the positive electrode conductive sheet is arranged on a pressing plate.

[0016] Furthermore, a load is installed on the sorting plate, and the negative electrode conductive sheet is located above the load.

[0017] Furthermore, an electric telescopic rod is installed inside the sorting plate, a push plate is installed on the piston rod of the electric telescopic rod, and the push plate is arranged in a V shape and installed in the measuring chamber.

[0018] This scheme also proposes a sorting method for lithium battery sorting, comprising the following steps:

[0019] Step 1: Load the lithium battery onto the measuring mechanism in the mounting table, and electrically connect the lithium battery to the charging and discharging device;

[0020] Step 2: Measure the voltage V, internal resistance R, and capacity Wh of the lithium battery through a measuring mechanism;

[0021] Step 3: Calculate the comprehensive performance of the lithium battery using the above data. The calculation formula is:

[0022] ;

[0023] Among them, P is the comprehensive performance evaluation score, C is capacity, R is internal resistance, V is voltage, Whmin and Whmax are the minimum capacitance and maximum capacitance values ​​in the same batch of lithium batteries, Rmin and Rmax are the minimum resistance and maximum resistance values ​​in the same batch of lithium batteries, Vmin and Vmax are the minimum voltage and maximum voltage values ​​in the same batch of lithium batteries;

[0024] is the capacity weight, is the weight of the internal resistance, is the voltage weight, .

[0025] Furthermore, in step 2, the measurement of the voltage V, internal resistance R, and capacity Wh of the lithium battery includes the following steps:

[0026] S1: By measuring the static voltage of the lithium battery Take measurements;

[0027] S1: Charge the lithium battery to a full state through the charging and discharging equipment, and then discharge it at a constant current A until the lithium battery reaches a predetermined termination voltage. During the discharge process, record the voltage V and discharge time h of the lithium battery, and calculate the capacity of the lithium battery using the above data. The calculation formula is:

[0028] ;

[0029] Among them, Ah is ampere-hour, which refers to the total amount of electricity that a lithium battery can provide during discharge; Wh is the battery capacity;

[0030] S3: When the lithium battery is fully charged, the load and the lithium battery are connected in series by controlling the contact between the negative electrode conductive sheet and the load, and the load voltage of the lithium battery is measured by the measuring device. , and then input the test current I into the lithium battery through the charging and discharging equipment, and calculate the internal resistance R of the lithium battery through the above data. The calculation formula is: ; In the formula, is the static voltage, is the load voltage.

[0031] Beneficial effects:

[0032] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0033] Through the structural setting and distribution relationship of several groups of sorting devices, this device can simultaneously measure multiple performance parameters of lithium batteries, including the voltage, capacity, and internal resistance parameters of lithium batteries, and can sort lithium batteries according to the specifications of a single parameter. It can also calculate the comprehensive performance of lithium batteries based on the measured parameter data and the influence relationship between the voltage, capacity, and internal resistance parameters, and then sort the lithium batteries according to the comprehensive performance, further improving the consistency of lithium battery performance sorting, and applying them to different application scenarios according to their performance levels, optimizing battery configuration, and making them perform best in specific applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 It is a schematic diagram of the dispersed connection of several sorting devices in an embodiment of the present invention;

[0036] Figure 2 It is a schematic diagram of linear connection of several sorting devices in an embodiment of the present invention;

[0037] Figure 3 It is a schematic diagram of the structural installation of a single sorting device in an embodiment of the present invention;

[0038] Figure 4 It is a schematic cross-sectional view of the internal structure of the sorting device in an embodiment of the present invention;

[0039] Figure 5 In the embodiment of the present invention Figure 4 A schematic diagram of the enlarged structure in the middle.

[0040] The numbers in the figure represent: 1. frame; 2. mounting table; 3. sorting device; 301. sorting plate; 302. measuring chamber; 303. charging and discharging equipment; 304. supporting table; 305. spring; 306. negative conductive sheet; 307. slide; 308. pressure plate; 309. positive conductive sheet; 310. screw rod; 311. motor one; 312. load; 313. conductive wire one; 314. measuring equipment; 315. conductive wire two; 316. electric telescopic rod; 317. push plate; 4. motor two; 5. conveyor plate. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, 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.

[0043] 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.

[0044] In the description of this embodiment, the terms "upper", "lower", "left", "right", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplified operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0045] The present invention will be further described below in conjunction with the embodiments.

[0046] Example:

[0047] Please refer to the attached Figure 1-5 This solution proposes a lithium battery sorting device, which transports the lithium battery to the sorting device 3 through the conveying plate 5 by the feeding device. The voltage, capacity, and internal resistance parameters of the lithium battery are measured by the sorting device 3, and the lithium battery is sorted according to a single parameter of the voltage, capacity, and internal resistance of the lithium battery. The sorting device 3 can also process the measurement results of the voltage, capacity, and internal resistance, and obtain the comprehensive performance of the lithium battery according to the influence relationship between the voltage, capacity, and internal resistance, and then sort the lithium battery according to the comprehensive performance, so as to further improve the consistency of the performance sorting of the lithium battery, and apply it to different application scenarios according to its performance level, optimize the battery configuration, and make it play the best performance in specific applications.

[0048] Specifically, a mounting table 2 is installed on the surface of the frame 1, and the sorting device 3 includes a sorting plate 301 rotatably connected to the mounting table 2. A measuring chamber 302 is provided on the surface of the sorting plate 301. The measuring chamber 302 is used for loading lithium batteries. A measuring mechanism is installed in each group of measuring chambers 302, and the performance parameters of the battery in the measuring chamber 302 can be measured through the measuring mechanism.

[0049] The measuring bins 302 are arranged in several groups, and the several groups of measuring bins 302 are distributed in equal distances on the circumference, so that multiple lithium batteries can be loaded on the sorting disk 301 at the same time, and synchronous measurement is performed through multiple groups of measuring mechanisms, thereby improving the sorting efficiency of lithium batteries of the device. A motor 2 4 is installed on the mounting table 2, and the output shaft of the motor 2 4 is connected to the sorting disk 301 in a transmission manner. When the motor 2 4 is turned on, the measuring bins 302 can be driven to rotate on the mounting table 2, thereby further realizing the position adjustment of the measuring bins 302 distributed on the sorting disk 301.

[0050] The feeding device is connected to the sorting device 3 through a set of conveying plates 5. The rotational tracks of the conveying plates 5 and the sorting disk 301 are tangent, and the conveying plates 5 are distributed to one side of the sorting disk 301 in an inclined shape from top to bottom. After the feeding device conveys the lithium battery to the surface of the conveying plates 5, the lithium battery slides to one side of the sorting disk 301 under the action of inertial force and gravity. During the rotation of the sorting disk 301, when the measuring bin 302 and the conveying plates 5 are aligned and there is no lithium battery in the measuring bin 302, the lithium battery will slide into the measuring bin 302 to realize the loading of the lithium battery into the measuring bin 302. And through the continuous rotation of the sorting disk 301, the lithium battery can be sequentially conveyed to the measuring bin 302 through the conveying plates 5 to realize the loading of multiple groups of lithium batteries, so that the device can simultaneously measure the performance parameters of multiple lithium batteries, thereby increasing the subsequent sorting efficiency.

[0051] The lower surface of the measuring chamber 302 is provided with a support platform 304 through a spring 305. When the support platform 304 is not affected by external force, the support platform 304 is lifted up by the elastic force of the spring 305, and the height after lifting up is lower than the lowest end of the conveying plate 5 for inputting lithium batteries, so that the lithium batteries will fall on the surface of the support platform 304 during the input process from the conveying plate 5, and the lithium batteries can be stably loaded into the measuring chamber 302. In addition, during the falling process, the elastic force of the spring 305 can buffer the downward pressure, and further realize the safety protection during the lithium battery loading process.

[0052] The sorting disc 301 is provided with a chute 307, and the measuring mechanism includes a pressing plate 308 slidably mounted in the chute 307. A screw rod 310 parallel to the chute 307 is also installed inside the sorting disc 301, and the pressing plate 308 is adaptively mounted on the screw rod 310. A motor 1 311 is installed inside the sorting disc 301, and the output shaft of the motor 1 311 is transmission-connected with the screw rod 310. The screw rod 310 is driven to rotate by the motor 1 311, and the pressing plate 308 can be controlled to slide linearly in the chute 307, and the spacing adjustment between the support platform 304 and the pressing plate 308 can be further realized.

[0053] When there is no lithium battery in the measuring chamber 302, the pressing plate 308 slides to the top of the chute 307, and the lithium battery can effectively fall on the surface of the support platform 304 without being blocked by the pressing plate 308. After the lithium battery falls on the surface of the support platform 304, the pressing plate 308 slides downward and presses on the upper end of the lithium battery, so that the lithium battery can be clamped and fixed, further ensuring that the lithium battery is stably installed in the measuring chamber 302, and preventing the sorting disk 301 from being thrown out during the rotation process.

[0054] The measuring mechanism also includes a negative conductive sheet 306 installed on the support platform 304. When the lithium battery falls to the surface of the support platform 304, the negative electrode of the lithium battery will contact the negative conductive sheet 306, and a positive conductive sheet 309 is installed on the pressure plate 308. When the pressure plate 308 clamps the lithium battery, the positive electrode of the lithium battery will contact the positive conductive sheet 309.

[0055] The positive electrode conductive sheet 309 and the negative electrode conductive sheet 306 are both connected with a conductive wire 1 313, and are electrically connected to the charging and discharging device 303 installed inside the sorting plate 301 through the conductive wire 1 313. The charging and discharging device 303 and the lithium battery are further electrically connected, so that the charging and discharging device 303 can charge and discharge the lithium battery, and facilitate the subsequent performance parameter measurement. A load 312 is installed on the sorting plate 301, and the negative electrode conductive sheet 306 is located above the load 312.

[0056] When the lithium battery falls to the surface of the support platform 304 and the internal resistance is not measured, the support platform 304 is lifted up by the elastic force of the spring 305, so that the negative electrode conductive sheet 306 and the load 312 are not in contact. The pressing plate 308 presses the lithium battery and pushes the support platform 304 downward, further making the negative electrode conductive sheet 306 slide against the surface of the load 312 and keep in contact all the time, so that the load 312 is connected in series between the charging and discharging device 303 and the lithium battery.

[0057] A measuring device 314 is also installed on the sorting disk 301. Two groups of conductive wires 315 are installed on the measuring device 314, and are respectively connected to the negative conductive sheet 306 and the positive conductive sheet 309 through the two groups of conductive wires 315. A voltmeter is provided in the measuring device 314, and the voltage of the lithium battery can be directly measured by the voltmeter. The load is used to measure the resistance of the lithium battery.

[0058] When the lithium battery is installed in the measuring chamber 302 and is electrically connected to the charging and discharging device 303, the following steps are included when the performance parameters of the lithium battery need to be tested:

[0059] Step 1: Lithium battery voltage measurement, by measuring the static voltage of the lithium battery by the measuring device 314 Take measurements;

[0060] Step 2: Lithium battery capacity measurement: charge the lithium battery to a full charge state through the charge and discharge device 303, and then discharge it at a constant current A until the lithium battery reaches a predetermined termination voltage, and record the battery voltage V and discharge time h during the discharge process. The lithium battery capacity is calculated using the above data, and the calculation formula is:

[0061] ;

[0062] Among them, Ah is ampere-hour, which refers to the total amount of electricity that a lithium battery can provide during the discharge process, and is usually used to indicate how long the battery can continue to supply power; A is the current provided by the battery during the discharge process, in amperes; Wh is the battery capacity, which indicates the energy consumed or generated by a lithium battery at one watt of power in one hour.

[0063] Step 3: Lithium battery internal resistance measurement. When the battery is fully charged, the negative electrode conductive sheet 306 is controlled to contact the load 312, so that the load 312 and the lithium battery are connected in series, and the load voltage of the lithium battery is measured by the measuring device 314. , and then input the test current I into the lithium battery through the charging and discharging device 303, and calculate the internal resistance R of the lithium battery through the above data, the calculation formula is: .

[0064] More specifically, through the above steps, the performance parameter measurement of the lithium battery can be completed on the sorting device 3.

[0065] An electric telescopic rod 316 is installed inside the sorting disc 301, and a push plate 317 is installed on the piston rod of the electric telescopic rod 316. The push plate 317 is set in a V shape and installed in the measuring chamber 302. When the lithium battery falls to the surface of the support platform 304, it will hit the push plate 317 to prevent the lithium battery from tilting. At the same time, after the performance parameter measurement of the lithium battery is completed, the electric telescopic rod 316 is opened, the push plate 317 is driven to slide, and the electric telescopic rod 316 is pushed to the outside of the measuring chamber 302, so that the electric telescopic rod 316 can be removed from the measuring chamber 302. A conveying plate 5 is installed on the surface of each group of mounting platforms 2. When the sorting disc 301 is rotating, after the lithium battery in the measuring chamber 302 is tested, the measuring chamber 302 is rotated to align with the conveying plate 5, and the lithium battery is further pushed out by the electric telescopic rod 316, so that the lithium battery that has completed the measurement will fall on the conveying plate 5 and be output through the conveying plate 5, thereby completing the sorting of the lithium battery.

[0066] The sorting devices 3 are arranged as several groups in a forked diffusion structure installed on the frame 1. According to the forked diffusion distribution of the sorting devices 3, the sorting devices 3 can be arranged in sequence as a primary sorting, a secondary sorting, a tertiary sorting and other multi-level sorting. The sorting devices 3 of two adjacent levels are connected by a conveying plate 5, and the height of the conveying plate 5 toward the upper sorting device 3 is higher than the height of the lower sorting device 3, so that after the lithium batteries in the upper sorting device 3 are pushed out, they can be transported to the lower sorting device 3 through the conveying plate 5, further realizing the multi-level sorting of lithium batteries. In addition, several groups of conveying plates 5 are arranged on each group of mounting platforms 2, and there is only one group of conveying plates 5 for inputting lithium batteries, further enabling each group of upper sorting devices 3 to correspond to multiple groups of lower sorting devices 3, and further enabling the lithium batteries to be sorted according to a single performance parameter after the performance parameter measurement is completed in the upper sorting device 3, such as sorting according to the capacity of the lithium batteries.

[0067] And through the setting of multiple groups of sorting devices 3, lithium batteries can be sorted for multiple times, and the sorting parameters are different each time. For example, after sorting according to the capacity of lithium batteries in the first-level sorting, lithium batteries of the same capacity are all transported to the same group of sorting devices 3 for secondary sorting, and the internal resistance of lithium batteries of the same capacity is sorted by the sorting device 3 for secondary sorting, and lithium batteries of the same capacity and the same internal resistance are transported to the same group of sorting devices 3 for tertiary sorting, and further the voltage of lithium batteries of the same capacity and the same internal resistance is sorted by the sorting device 3 for tertiary sorting, so as to realize multi-level sorting of lithium batteries, and the performance parameters of each level of sorting are different. In addition, in the sorting process, batteries with unstable voltage, insufficient capacity or too high internal resistance can be excluded, which may have safety hazards during use. Through the above sorting, battery failures and potential safety risks can be reduced.

[0068] It is worth noting that after the lithium battery completes the voltage, capacity, and internal resistance data measurements, the comprehensive performance of the lithium battery can be obtained based on the measured data. The calculation formula is: ;

[0069] Among them, P is the comprehensive performance evaluation score, C is capacity, R is internal resistance, V is voltage, Whmin and Whmax are the minimum capacitance and maximum capacitance values ​​in the same batch of lithium batteries, Rmin and Rmax are the minimum resistance and maximum resistance values ​​in the same batch of lithium batteries, Vmin and Vmax are the minimum voltage and maximum voltage values ​​in the same batch of lithium batteries. is the capacity weight, is the weight of the internal resistance, is the voltage weight, , to ensure the normalization of the formula.

[0070] Through the above method, the device can sort batches of lithium batteries according to the comprehensive performance evaluation score P of the lithium batteries, so that the sorted lithium batteries can be applied to different application scenarios according to their comprehensive performance levels, optimize the battery configuration, and make them perform best in specific applications.

[0071] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lithium battery sorting device, comprising a frame (1), characterized in that: Also includes: A sorting device (3), the sorting device (3) being mounted on the frame (1) via a mounting platform (2), the sorting device (3) comprising a sorting plate (301) rotatably connected to the mounting platform (2), a surface of the sorting plate (301) being provided with measuring bins (302) for loading lithium batteries, the measuring bins (302) being arranged in a plurality of groups, and the plurality of groups of measuring bins (302) being distributed in a circle at equal distances; A measuring mechanism, the measuring mechanism being installed in the measuring chamber (302) and used to detect the voltage, capacity and internal resistance of the lithium battery, the measuring mechanism comprising a negative electrode conductive sheet (306) and a positive electrode conductive sheet (309) installed in the measuring chamber (302), the negative electrode conductive sheet (306) and the positive electrode conductive sheet (309) being connected to the positive and negative electrodes of the lithium battery to be tested, respectively; a charging and discharging device (303), a load (312) and a measuring device (314) being installed on the sorting plate (301); the charging and discharging device (303) being electrically connected to the negative electrode conductive sheet (306) and the positive electrode conductive sheet (309) via a first conductive wire (313); the measuring device (314) being electrically connected to the negative electrode conductive sheet (306) and the positive electrode conductive sheet (309) via a second conductive wire (315); and the load (312) being connected in series between the lithium battery and the charging and discharging device (303) when used for internal resistance measurement; The mounting platform (2) is configured to be mounted on the frame (1) in a forked diffusion structure, and each of the mounting platforms (2) is mounted with a plurality of conveying plates (5), wherein one of the conveying plates (5) is used to input lithium batteries into the measuring chamber (302); a second motor (4) is mounted on the mounting platform (2), and the second motor (4) is rotatably connected to the sorting disc (301); a slide groove (307) is provided on the sorting disc (301), and the measuring mechanism comprises a pressing plate (308) slidably mounted in the slide groove (307), the pressing plate (308) is mounted in the measuring chamber (302), and the pressing plate (308) is located above the supporting platform (304); a screw rod (310) parallel to the slide groove (307) is also mounted inside the sorting disc (301), and the pressing plate (308) is mounted on the screw rod (310) in a corresponding manner, and the sorting disc (301) is provided with a plurality of conveying plates (5), wherein the conveying plates (5) are used to input lithium batteries into the measuring chamber (302); a second motor (4) is mounted on the mounting platform (2), and the second motor (4) is rotatably connected to the sorting disc (301); a slide groove (307) is provided on the sorting disc (301), and the measuring mechanism comprises a pressing plate (308) slidably mounted in the slide groove (307), and the pressing plate (308) is mounted in the measuring chamber (302), and the pressing plate (308) is located above the supporting platform (304); a screw rod (310) parallel to the slide groove (307) is also mounted inside the sorting disc (301), and the pressing plate (308) is mounted on the screw rod (310) in a corresponding manner, and the sorting disc (301) is provided with a plurality of conveying plates (5), wherein the conveying plates (5) are provided with 1) is installed inside a motor 1 (311), the output shaft of the motor 1 (311) is transmission-connected to the lead screw (310); a support platform (304) is installed on the lower end surface of the measuring chamber (302) via a spring (305), the lowermost plane of the conveying plate (5) for inputting lithium batteries is higher than the upper surface of the support platform (304); the negative electrode conductive sheet (306) is arranged on the support platform (304), and the positive electrode conductive sheet (309) is arranged on the pressing plate (308); a load (312) is installed on the sorting disc (301), and the negative electrode conductive sheet (306) is located above the load (312); an electric telescopic rod (316) is installed inside the sorting disc (301), a push plate (317) is installed on the piston rod of the electric telescopic rod (316), and the push plate (317) is arranged in a V shape and installed in the measuring chamber (302).

2. A lithium battery sorting method, applied to a lithium battery sorting device in claim 1, characterized in that: The following steps are involved: Step 1: Loading the lithium battery onto the measuring mechanism in the mounting platform (2), and electrically connecting the lithium battery and the charging and discharging device (303); Step 2: Use a measuring mechanism to measure the voltage V, internal resistance R, and capacity Wh of the lithium battery to obtain measurement data; Step 3: Calculate the comprehensive performance of the lithium battery using the measurement data obtained in step 2. The calculation formula is: ； Among them, P is the comprehensive performance evaluation score, C is capacity, R is internal resistance, V is voltage, Whmin and Whmax are the minimum capacitance and maximum capacitance values ​​in the same batch of lithium batteries, Rmin and Rmax are the minimum resistance and maximum resistance values ​​in the same batch of lithium batteries, Vmin and Vmax are the minimum voltage and maximum voltage values ​​in the same batch of lithium batteries; is the capacity weight, is the weight of the internal resistance, is the voltage weight, .

3. A lithium battery sorting method according to claim 2, characterized in that: In the step 2, the measurement of the voltage V, internal resistance R, and capacity Wh of the lithium battery includes the following steps: S1: The static voltage of the lithium battery is measured by the measuring device (314). Take measurements; S2: The lithium battery is charged to a fully charged state by the charging and discharging device (303), and then discharged at a constant current A until the lithium battery reaches a predetermined termination voltage, and the voltage V and discharge time h of the lithium battery are recorded during the discharge process, and the capacity of the lithium battery is calculated, and the calculation formula is: ； Among them, Ah is ampere-hour, which refers to the total amount of electricity that a lithium battery can provide during discharge; Wh is the battery capacity; S3: When the lithium battery is fully charged, the negative electrode conductive sheet (306) is controlled to contact the load (312), so that the load (312) and the lithium battery are connected in series, and the load voltage of the lithium battery is measured by the measuring device (314). , and then input the test current I into the lithium battery through the charging and discharging device (303), and calculate the internal resistance R of the lithium battery through the above data, and the calculation formula is: ; In the formula, is the static voltage, is the load voltage.

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