Battery capacity detection device and test method thereof

Abstract

The invention relates to the technical field of intelligent power grids, and particularly discloses a battery capacity detection device and a test method thereof.The battery capacity detection device comprises a battery placement unit and a capacity test unit, and the capacity test unit comprises a test piece matched with an electrode column of a battery piece; the test piece comprises a test rod fixed on the first lifting sliding table, a sleeve is arranged at the bottom of the test rod, a sealing piece is arranged at the bottom of the sleeve, a lifting rod is movably arranged in the sleeve, and the lower end part of the lifting rod is connected with a test electrode and a conductive liquid filling piece; a closed cavity is formed by the sleeve and the sealing piece, and conductive liquid is injected through the conductive liquid filling piece to completely fill a microscopic gap between the test electrode and the electrode column, so that the contact resistance is effectively reduced, and the current conduction stability is improved; the lifting rod adaptively adjusts the downward pressure in the sleeve, and in combination with the elastic deformation of the sealing element, the pressure of the electrode contact surface is uniformly distributed, and the conductive liquid is prevented from leaking.

Description

Technical Field

[0001] The present invention relates to the technical field of smart grids, and more particularly, to a battery capacity detection device and a testing method thereof. Background Art

[0002] Against the backdrop of the rapid development of smart grids, energy storage batteries, as core units for smoothing out fluctuations in renewable energy and supporting frequency and peak regulation, require precise detection of their capacity decay, which is directly related to grid security and economic efficiency. In smart grids, battery energy storage systems play a crucial role in maintaining grid stability and improving energy efficiency. Accurate battery capacity detection can effectively screen out poorly performing batteries, preventing them from causing failures during grid operation and ensuring reliable power supply. However, existing battery capacity detection technology has many defects. On the one hand, in terms of contact between electrodes and batteries, traditional detection devices find it difficult to achieve close and uniform contact between electrodes and battery electrode columns, resulting in unstable contact resistance, affecting the stability of current conduction, and thus greatly reducing the accuracy of capacity detection; on the other hand, for problems such as microscopic unevenness, corrosion, oxidation and dimensional tolerance on the surface of battery electrode columns, existing technologies lack effective adaptation measures and cannot guarantee stable and accurate capacity detection under different working conditions. It is easy to cause distortion of detection results due to problems such as poor electrode contact, and cannot meet the urgent needs of the smart grid industry for high-precision and high-reliability battery capacity detection. Summary of the Invention

[0003] In order to overcome the above technical problems, the present invention proposes a battery capacity detection device and a testing method thereof.

[0004] The purpose of the present invention can be achieved through the following technical solutions: The present invention discloses a battery capacity detection device, comprising: Machine; A battery placement unit, comprising a battery placement table movably arranged on a machine platform, wherein a groove for accommodating battery cells is formed in the battery placement table, and recessed portions adapted to the protrusions of the battery cells are symmetrically formed on both sides of the groove; A capacity testing unit includes a first bracket fixed on a machine platform, a first lifting cylinder vertically mounted on the first bracket, and a first lifting slide arranged at the output end of the first lifting cylinder. Test pieces adapted to the electrode columns of the battery cell are symmetrically arranged on both sides of the first lifting slide. The test piece includes a test rod fixed on the first lifting slide, a sleeve is provided at the bottom of the test rod, a sealing member is provided at the bottom of the sleeve, a lifting rod is movably provided in the sleeve, and the lower end of the lifting rod is connected to a test electrode and a conductive liquid filling member.

[0005] As a further solution of the present invention: the sealing member includes a sealing cover movably mounted on the lower end of the sleeve, an annular air chamber is opened in the sealing cover, the lower end of the annular air chamber is connected to a flexible sealing capsule, and a conductive liquid filling cavity for accommodating conductive liquid is formed in the middle of the sealing cover.

[0006] As a further solution of the present invention: the flexible sealing capsule includes a bottom sealing sheet adapted to the upper end surface of the battery cell and a side sealing sheet adapted to the outer peripheral surface of the electrode column.

[0007] As a further solution of the present invention: the conductive liquid filling part includes a sealing cover coaxially sleeved on the outside of the test electrode, a liquid storage tank is provided inside the sealing cover, a liquid pump connected to the liquid storage tank is installed on the upper end surface of the sealing cover, and a vent hole connected to the conductive liquid filling cavity is also provided on the sealing cover.

[0008] As a further solution of the present invention: the lower end surface of the sealing cover is provided with an annular flexible filling pipe connected to the liquid storage tank, the bottom of the annular flexible filling pipe is circumferentially provided with several openings, and the outer peripheral surface of the sealing cover is provided with a sealing ring adapted to the conductive liquid filling cavity.

[0009] As a further solution of the present invention: the battery placement unit also includes a transverse slide fixed on the machine platform and a transverse slide slidably installed on the transverse slide, the battery placement platform is arranged on the transverse slide, and a transverse motor is also installed on the machine platform, the output end of the transverse motor is connected to a transverse screw, and the transverse slide is threadedly connected to the transverse screw.

[0010] As a further solution of the present invention: a plurality of suction cups are further provided in the groove, and an air pump connected to each suction cup is installed on one side of the transverse slide.

[0011] As a further solution of the present invention: it also includes a discharge unit, which includes a second bracket fixed on the machine platform, a second lifting slide rail vertically installed on the second bracket, and a second lifting cylinder installed on the top of the second bracket, the output end of the second lifting cylinder is connected to a second lifting slide sliding platform slidingly connected to the second lifting slide rail, and the second lifting slide is symmetrically provided with discharge parts adapted to the electrode column on both sides; the discharge part includes a discharge terminal fixed on the second lifting slide, and the bottom of the discharge terminal is connected to the discharge electrode.

[0012] As a further solution of the present invention: a heat conducting plate adapted to the upper end surface of the battery cell is also provided at the bottom of the second lifting slide, a number of heat conducting rods are vertically fixed on the heat conducting plate, a corresponding ring adapted to the sliding of the heat conducting rod is provided on the second lifting slide, a heat conducting plate is provided on the upper end surface of the heat conducting rod, and a heat dissipation plate adapted to the heat conducting plate is embedded in the second lifting slide.

[0013] The present invention also discloses a testing method using a battery capacity detection device, comprising the following steps: Step 1: Position the battery: Place the battery cell in the groove of the battery placement table so that the protruding part fits into the recessed part to complete the mechanical limit. Step 2: Horizontal calibration: Adjust the horizontal position of the battery placement table so that the electrode column is directly below the corresponding test piece; Step 3: Sealing contact: The first lifting cylinder drives the first lifting slide downward until the sealing member wraps around the electrode column to form a closed cavity; Step 4: Conductive liquid injection: The conductive liquid filling component injects conductive liquid into the conductive liquid filling cavity to fill the micro gap between the test electrode and the electrode column; Step 5: Capacity test: Apply charge and discharge current to the test electrode, collect voltage / current data, and calculate the actual capacity and SOH value; Step 6: Conductive liquid recovery: After the test is completed, the conductive liquid filling part reverses the suction and recovers the conductive liquid into the liquid storage tank.

[0014] Beneficial effects of the present invention: A closed cavity is formed by using the sleeve and the seal, and conductive liquid is injected through the conductive liquid filling part to completely fill the microscopic gap between the test electrode and the electrode column, thereby effectively reducing the contact resistance and improving the current conduction stability; the lifting rod adaptively adjusts the downward pressure in the sleeve, and combined with the elastic deformation of the seal, realizes uniform pressure distribution on the electrode contact surface, while preventing leakage of conductive liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings.

[0016] Figure 1 is a three-dimensional schematic diagram of a battery capacity detection device of the present invention; Figure 2 is a three-dimensional schematic diagram of the battery capacity detection device of the present invention from another perspective; Figure 3 Schematic diagram of the structure of the battery placement unit in the battery capacity detection device of the present invention; Figure 4 It is a structural schematic diagram of the battery placement table in the battery capacity detection device of the present invention; Figure 5 Schematic diagram of the structure of the capacity testing unit in the battery capacity detection device of the present invention; Figure 6 Schematic diagram of the structure of the test piece in the battery capacity detection device of the present invention; Figure 7 A partial cross-sectional view of a test piece in a battery capacity detection device of the present invention; Figure 8It is a structural schematic diagram of the conductive liquid filling component in the battery capacity detection device of the present invention; Figure 9 Schematic diagram of the structure of the discharge unit in the battery capacity detection device of the present invention; Figure 10 Schematic diagram of the structure of the discharge member and the heat conducting plate in the battery capacity detection device of the present invention; Figure 11 It is a structural schematic diagram of the repair unit in the battery capacity detection device of the present invention.

[0017] In the picture: 100, machine; 200, battery placement unit; 210, transverse slide rail; 220, transverse slide platform; 230, transverse motor; 240, transverse screw rod; 250, battery placement platform; 251, groove; 252, recessed portion; 260, air pump; 270, suction cup; 300, capacity test unit; 310, first bracket; 320, first lifting cylinder; 330, first lifting slide; 340, test piece; 341, test rod; 342, sleeve; 343, sealing member; 3431, sealing cover; 3432, annular air chamber; 3433, flexible sealing capsule; 3434, bottom sealing sheet; 3435, side sealing sheet; 344, lifting rod; 345, test electrode; 346, conductive liquid filling member; 3461, sealing cover; 3462, liquid storage chamber; 3463, liquid pump; 3464, annular flexible filling pipe; 3465, opening; 3466, sealing ring; 3467, vent; 347, conductive liquid filling chamber; 400, discharge unit; 410, second bracket; 420, second lifting rail; 430, second lifting cylinder; 440, second lifting platform; 450, discharge member; 451, discharge terminal; 452, discharge electrode; 460, heat conducting plate; 470, heat conducting rod; 480, collar; 490, heat conducting sheet; 500, repair unit; 510, third lifting cylinder; 520, repair platform; 521, repair tank; 530, third bracket; 540, longitudinal slide rail; 541, longitudinal slide platform; 542, longitudinal motor; 543, longitudinal screw; 550, lifting rail; 551, lifting slide platform; 552, lifting motor; 553, lifting screw; 560, transfer plate; 600, battery cell; 610, protrusion; 620, electrode column. DETAILED DESCRIPTION

[0018] The subject matter described herein will now be discussed with reference to exemplary embodiments. It should be understood that these embodiments are discussed solely to enable those skilled in the art to better understand and implement the subject matter described herein, and that the functions and arrangements of the elements discussed may be varied without departing from the scope of this specification. Various examples may omit, substitute, or add various processes or components as needed. In addition, features described with respect to some examples may also be combined in other examples.

[0019] See also Figure 1 and Figure 2 , the present invention discloses a battery capacity detection device, including a machine 100, a battery placement unit 200 and a capacity testing unit 300; See also Figure 3 and Figure 4 The battery placement unit 200 includes a battery placement table 250 that is laterally movably disposed on the machine 100. The battery placement table 250 has a groove 251 for accommodating the battery cell 600. The groove 251 has two symmetrical sides with recessed portions 252 that are adapted to the protrusions 610 of the battery cell 600. See also Figure 5 、 Figure 6 and Figure 7 The capacity testing unit 300 includes a first bracket 310 fixed to the machine platform 100, a first lifting cylinder 320 vertically mounted on the first bracket 310, and a first lifting slide 330 provided at the output end of the first lifting cylinder 320. Test pieces 340 adapted to the electrode columns 620 of the battery cell 600 are symmetrically provided on both sides of the first lifting slide 330. The test piece 340 includes a test rod 341 fixed to the first lifting slide 330. A sleeve 342 is provided at the bottom of the test rod 341. A sealing member 343 is provided at the bottom of the sleeve 342. A lifting rod 344 is movably provided in the sleeve 342. The lower end of the lifting rod 344 is connected to a test electrode 345 and a conductive liquid filling member 346. Specifically, the battery cell 600 is placed in the groove 251 of the battery placement platform 250 so that the protrusions 610 on both sides of the battery cell 600 fit neatly into the corresponding recesses 252 on both sides of the groove 251. The position of the battery placement platform 250 is adjusted so that the electrode posts 620 on both sides of the battery cell 600 are located directly below the two sets of test pieces 340. The first lifting slide 330 is driven downward by the first lifting cylinder 320 until the sleeve 342 under the test piece 340 contacts the upper end surface of the battery cell 600, and the periphery of the electrode column 620 is sealed by the sealing member 343. At the same time, the test electrode 345 is electrically connected to the electrode column 620, and conductive liquid is added to the sealing member 343 through the conductive liquid filling member 346. The contact gap between the test electrode 345 and the electrode column 620 is filled with the conductive liquid, thereby increasing the conductive area between the test electrode 345 and the electrode column 620, thereby improving the capacity detection accuracy.

[0020] For the capacity detection of the battery cell 600, the test process mainly includes a parameter initialization stage, a constant current charging stage, a static stage and a constant current discharge stage, wherein the parameter initialization stage mainly includes setting the charge and discharge rate, the cut-off voltage, the temperature threshold and calibrating the contact resistance of the test electrode 345; in the constant current charging stage, the battery cell 600 is charged with a constant current, and the voltage, current and temperature data are collected in real time, while the pressure in the conductive liquid filling cavity 347 is monitored to ensure that there is no bubble interference; in the static stage, charging and discharging are stopped, and the battery is left to stand for 30 minutes, and the voltage rebound amplitude and the open circuit voltage stability are monitored; in the constant current discharge stage, the battery is discharged to the cut-off voltage at the same rate, and data is collected synchronously; the above capacity detection process is an existing technology and will not be repeated later.

[0021] It should be noted that, in the present invention, the sleeve 342 and the seal 343 form a closed cavity, and a conductive liquid (such as an ionic liquid or an electrolytic gel) is injected through the conductive liquid filling part 346 to completely fill the microscopic gap between the test electrode 345 and the electrode column 620, thereby effectively reducing the contact resistance and improving the current conduction stability. The lifting rod 344 adaptively adjusts the downward pressure in the sleeve 342, and combined with the elastic deformation of the sealing member 343 (such as silicone or fluororubber), achieves uniform pressure distribution on the electrode contact surface and prevents leakage of the conductive liquid.

[0022] In one embodiment, see Figure 7 The sealing member 343 includes a sealing cover 3431 movably mounted on the lower end of the sleeve 342. An annular air chamber 3432 is provided in the sealing cover 3431. A flexible sealing capsule 3433 is connected to the lower end of the annular air chamber 3432. A conductive liquid filling cavity 347 for accommodating conductive liquid is formed in the middle of the sealing cover 3431. Specifically, when the sleeve 342 descends until the flexible sealing capsule 3433 at the lower end of the sealing cover 3431 contacts the upper end surface of the battery cell 600, the sleeve 342 continues to descend, thereby squeezing the gas in the annular air chamber 3432 downward, causing the flexible sealing capsule 3433 to expand under pressure, and utilizing the elastic deformation of the flexible sealing capsule 3433 to circumferentially wrap and seal the electrode column 620, thereby sealing and isolating the corresponding electrode column 620 in the conductive liquid filling cavity 347; and then the conductive liquid filling cavity 347 can be filled with conductive liquid through the conductive liquid filling piece 346.

[0023] It is worth noting that the linkage design of the annular gas chamber 3432 and the flexible sealing capsule 3433 allows the downward movement of the sleeve 342 to compress the gas in the annular gas chamber 3432, driving the flexible sealing capsule 3433 to elastically expand, thereby forming a circumferentially wrapped seal around the electrode column 620, adapting to different working conditions such as diameter runout tolerance or surface unevenness of the electrode column 620; The flexible sealing capsule 3433 is made of fluorosilicone rubber (resistant to electrolyte corrosion). After expansion, it fits tightly against the outer surface of the battery cell 600, forming a seamless sealed interface, effectively reducing leakage and ensuring that the conductive liquid in the conductive liquid filling cavity 347 completely encapsulates the electrode column 620, eliminating the risk of leakage. The conductive liquid filling member 346 injects a highly fluid ionic liquid into the conductive liquid filling chamber 347. The flexible sealing capsule 3433 provides a wrapping and guiding function, forcing the conductive liquid to evenly penetrate the micron-scale gap between the electrode column 620 and the test electrode 345, thereby increasing the contact area and the stability of the contact resistance. The elastic deformation capability of the flexible sealing capsule 3433 can adaptively wrap the corroded, oxidized or deformed electrode column 620. By adjusting the downward displacement of the sleeve 342, a constant sealing pressure is always maintained to avoid test failure caused by electrode aging.

[0024] Further, see Figure 7 The flexible sealing capsule 3433 includes a bottom sealing sheet 3434 adapted to the upper end surface of the battery cell 600 and a side sealing sheet 3435 adapted to the outer peripheral surface of the electrode column 620; Specifically, when the sleeve 342 moves downward to squeeze the gas in the annular air chamber 3432, it can cause the bottom sealing sheet 3434 of the flexible sealing capsule 3433 to fit tightly with the upper end surface of the battery cell 600, and at the same time cause the side sealing sheet 3435 to expand radially and fit tightly with the outer peripheral surface of the electrode column 620, thereby wrapping and sealing the electrode column 620 in all directions, effectively preventing leakage of conductive liquid inside the conductive liquid filling cavity 347.

[0025] It should be noted that the bottom sealing sheet 3434 and the side sealing sheet 3435 work together. The bottom sealing sheet 3434 forms a planar seal with the upper end surface of the battery cell 600 through vertical compression, and the side sealing sheet 3435 forms an annular seal by radially expanding to wrap around the outer circumference of the electrode column 620, thereby achieving all-round three-dimensional packaging of the electrode column 620, thereby reducing the leakage rate of the conductive liquid. The bottom sealing sheet 3434 is made of low elastic modulus silicone to fill micron-level unevenness on the upper end surface of the battery cell 600. The side sealing sheet 3435 adopts a gradient elastic design (inner layer Shore hardness 30A, outer layer 50A). During radial expansion, the inner layer deforms preferentially to conform to the surface of the electrode column 620, while the outer layer provides structural support to adapt to diameter fluctuations or ovality deviations of the electrode column 620. In addition, after the sleeve 342 downward squeezes the annular air chamber 3432, the flexible sealing bag 3433 can complete double sealing of the bottom and sides within 0.3 seconds, and the residual deformation after release is less than 1%, avoiding sealing failure due to plastic deformation.

[0026] For further information, see Figure 8 The conductive liquid filling member 346 includes a sealing cover 3461 coaxially sleeved on the outside of the test electrode 345. A liquid storage tank 3462 is defined in the sealing cover 3461. A liquid pump 3463 connected to the liquid storage tank 3462 is mounted on the upper end surface of the sealing cover 3461. The sealing cover 3461 also has a vent hole 3467 in communication with the conductive liquid filling chamber 347. Specifically, after the sleeve 342 has descended into place, the lifting rod 344 continues to descend, thereby driving the test electrode 345 to be electrically connected to the electrode column 620. At the same time, the sealing cover 3461 seals the upper end of the conductive liquid filling cavity 347, and the conductive liquid in the liquid storage tank 3462 is pumped into the conductive liquid filling cavity 347 through the liquid pump 3463 to achieve the filling of the conductive liquid in the conductive liquid filling cavity 347; after the detection is completed, the conductive liquid in the conductive liquid filling cavity 347 is sucked back into the liquid storage tank 3462 through the liquid pump 3463.

[0027] The liquid pump 3463 and the liquid storage tank 3462 form a closed fluid system. The injection and recovery of the conductive liquid are controlled by the forward and reverse rotation of the liquid pump 3463 to avoid waste of the conductive liquid and reduce the risk of pollution; the vent hole 3467 discharges the gas in the conductive liquid filling cavity 347 during filling, and at the same time, the sealing cover 3461 and the conductive liquid filling cavity 347 are rigidly sealed to maintain a slight positive pressure in the cavity, eliminating contact resistance fluctuations caused by bubbles.

[0028] Also, see Figure 8The lower end surface of the sealing cover 3461 is provided with an annular flexible filling pipe 3464 connected to the liquid storage tank 3462. The bottom of the annular flexible filling pipe 3464 is circumferentially provided with a plurality of openings 3465. The outer circumferential surface of the sealing cover 3461 is provided with a sealing ring 3466 adapted to the conductive liquid filling cavity 347. Specifically, when the sealing cover 3461 moves downward, the lower end of the annular flexible filling tube 3464 contacts the radially expanded side sealing sheet 3435, and the liquid pump 3463 pumps the conductive liquid in the liquid storage tank 3462 into the annular flexible filling tube 3464. The conductive liquid then overflows through the openings 3465 to circumferentially fill the conductive liquid filling chamber 347, effectively eliminating local cavitation. When the conductive liquid is sucked back into the conductive liquid filling chamber 347, the lower end of the annular flexible filling tube 3464 is flexibly deformed, so that each opening 3465 is radially expanded and fully fits with the side sealing piece 3435, so as to ensure that the conductive liquid at the bottom of the conductive liquid filling chamber 347 can be fully sucked back into the annular flexible filling tube 3464, thereby avoiding the presence of conductive liquid residue in the conductive liquid filling chamber 347.

[0029] It should be noted that the conductive liquid overflows uniformly in the annular direction through the multiple openings 3465 to form a laminar filling flow, thereby eliminating local eddy currents and cavitations in the conductive liquid filling cavity 347 and improving the contact resistance consistency. The annular flexible filling tube 3464 is radially expanded. When absorbing liquid, the tube body expands radially due to negative pressure. The opening 3465 fits tightly with the side sealing piece 3435 to form an annular scraping structure to avoid contact contamination caused by electrolyte crystallization.

[0030] In yet another embodiment, see Figure 3 The battery placement unit 200 further includes a transverse slide rail 210 fixed to the machine platform 100 and a transverse slide 220 slidably mounted on the transverse slide rail 210. The battery placement platform 250 is disposed on the transverse slide 220. A transverse motor 230 is further mounted on the machine platform 100. The output end of the transverse motor 230 is connected to a transverse screw rod 240. The transverse slide 220 is threadedly connected to the transverse screw rod 240. Specifically, by driving the transverse screw 240 to rotate through the transverse motor 230, the transverse slide 220 can be driven to move laterally along the transverse slide rail 210 to adjust the lateral position of the battery placement table 250, thereby facilitating position correction of the battery cell 600 and the test piece 340.

[0031] Further, see Figure 4 , a plurality of suction cups 270 are further provided in the groove 251 , and an air pump 260 connected to each suction cup 270 is installed on one side of the transverse slide 220 ; When the battery cell 600 is placed in the groove 251, the air pump 260 is turned on to generate negative pressure at the suction cup 270, so that the suction cup 270 can be used to adsorb and fix the lower end surface of the battery cell 600, preventing the battery cell 600 from shifting during the detection process and affecting the contact effect between the test piece 340 and the electrode column 620.

[0032] In further embodiments, see Figure 9 , further comprising a discharge unit 400, the discharge unit 400 comprising a second bracket 410 fixed to the machine platform 100, a second lifting rail 420 vertically mounted on the second bracket 410, and a second lifting cylinder 430 mounted on the top of the second bracket 410, the output end of the second lifting cylinder 430 being connected to a second lifting slide 440 slidably connected to the second lifting rail 420, and discharge members 450 adapted to the electrode column 620 being symmetrically arranged on both sides of the second lifting slide 440; Specifically, when the capacity test of the battery cell 600 is completed, the battery placement table 250 is driven by the transverse motor 230 to move horizontally to directly below the second lifting slide 440, and the second lifting cylinder 430 drives the second lifting slide 440 to move downward along the second lifting rail 420 until the discharge component 450 is electrically connected to the corresponding electrode column 620. The discharge component 450 can then be used to discharge the electricity from the battery cell 600 until the voltage of the battery cell 600 drops to a stable range.

[0033] Further, see Figure 10 The discharge member 450 includes a discharge terminal 451 fixed on the second lifting slide 440, and the bottom of the discharge terminal 451 is connected to a discharge electrode 452; A heat conducting plate 460 is further provided at the bottom of the second lifting slide 440 and is adapted to the upper end surface of the battery cell 600. A plurality of heat conducting rods 470 are vertically fixed to the heat conducting plate 460. A corresponding collar 480 is provided on the second lifting slide 440 and is slidably adapted to the heat conducting rods 470. A heat conducting sheet 490 is provided on the upper end surface of the heat conducting rod 470. A heat dissipation plate (not shown in the figure) adapted to the heat conducting sheet 490 is embedded in the second lifting slide 440. Specifically, when the discharge terminal 451 is electrically connected to the corresponding electrode column 620, the heat sink 460 also fits tightly against the upper end face of the battery cell 600. At the same time, the thermal rod 470 slides upward relative to the ring 480 until the thermal sheet 490 fits tightly against the heat sink. Thus, during the current discharge process, the heat generated on the battery cell 600 is quickly transferred through the thermal plate 460, the thermal rod 470 and the thermal sheet 490 to the heat sink in the second lifting slide 440, thereby achieving efficient heat dissipation of the battery cell 600.

[0034] Through the rigid contact between the discharge electrode 452 and the electrode column 620, combined with the constant current discharge circuit, the voltage of the battery cell 600 is quickly discharged from 4.2V to 2.5V (≤30 seconds), and the residual voltage fluctuation is less than ±0.1V; The heat conducting plate 460 (copper-nickel-plated material) fits tightly against the upper end surface of the battery cell 600. The heat conducting rod 470 (heat pipe structure) moves upward along with the second lifting slide 440 during discharge, forming a low thermal resistance channel with the heat dissipation plate.

[0035] In yet another embodiment, see Figure 11 , further comprising a repair unit 500, the repair unit 500 comprising a third lifting cylinder 510 and a third bracket 530 fixedly mounted on the machine platform 100, a liftable repair platform 520 being mounted at the output end of the third lifting cylinder 510, and a repair slot 521 for accommodating the battery cell 600 being provided in the repair platform 520; A longitudinal slide rail 540 and a longitudinal motor 542 are horizontally mounted on the third bracket 530. A longitudinal slide table 541 is slidably mounted on the longitudinal slide rail 540. A longitudinal screw rod 543 threadedly connected to the longitudinal slide table 541 is provided at the output end of the longitudinal motor 542. A transfer slide rail 550 and a transfer motor 552 are vertically mounted on the longitudinal slide table 541. A transfer slide table 551 is slidably mounted on the transfer slide rail 550. A transfer screw rod 553 threadedly connected to the transfer slide table 551 is provided at the output end of the transfer motor 552. A transfer plate 560 adapted to the repair table 520 is provided on the transfer slide table 551. Specifically, the longitudinal motor 542 can drive the longitudinal slide 541 to move horizontally and longitudinally along the longitudinal slide rail 540, and the transfer motor 552 can drive the transfer slide 551 to move vertically along the transfer slide rail 550, so that the horizontal position and height adjustment of the transfer plate 560 can be achieved by using the longitudinal motor 542 and the transfer motor 552 to cooperate with each other; When the capacity test of the battery cell 600 in the battery placement table 250 fails, the transfer plate 560 is moved to the battery placement table 250, the unqualified battery cell 600 is sucked out from the groove 251, and then the battery cell 600 is transferred to the repair table 520, and the unqualified battery cell 600 can be subsequently repaired.

[0036] The unqualified battery cells 600 are grabbed by negative pressure adsorption on the transfer plate 560, and the transfer from the inspection station to the repair station is quickly completed by linking the longitudinal slide rail 540 with the lifting slide rail 550; the repair tank 521 has a built-in liquid cooling channel to maintain the temperature of the battery cell 600 during the repair process to prevent secondary damage caused by overheating.

[0037] The present invention also provides a testing method using a battery capacity detection device, comprising the following steps: Step 1: Positioning the battery: Place the battery cell 600 in the groove 251 of the battery placement platform 250 so that the protrusion 610 fits into the recess 252 to complete the mechanical positioning. Step 2: Horizontal calibration: Adjust the horizontal position of the battery placement table 250 so that the electrode column 620 is directly below the corresponding test piece 340; Step 3: Sealing contact: The first lifting cylinder 320 drives the first lifting slide 330 downward until the sealing member 343 wraps around the electrode column 620 to form a closed cavity; Step 4: Conductive liquid injection: The conductive liquid filling member 346 injects conductive liquid into the conductive liquid filling cavity 347 to fill the micro gap between the test electrode 345 and the electrode column 620; Step 5: Capacity test: Apply charge and discharge current through the test electrode 345, collect voltage / current data, and calculate the actual capacity and SOH value; Step 6: Conductive liquid recovery: After the test is completed, the conductive liquid filling component 346 reverses the suction to recover the conductive liquid into the liquid storage tank 3462.

[0038] The above describes the specific embodiments of the present invention, but the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the guidance of the present invention, those skilled in the art can also make many forms, all of which are protected by the present invention.

Claims

1. The present invention discloses a battery capacity detection device, characterized in that: include: Machine (100); A battery placement unit (200) comprises a battery placement table (250) movably arranged on a machine table (100), wherein a groove (251) for accommodating a battery cell (600) is provided in the battery placement table (250), and recessed portions (252) adapted to the protruding portions (610) of the battery cell (600) are symmetrically provided on both sides of the groove (251); A capacity testing unit (300) comprises a first bracket (310) fixed on a machine platform (100), a first lifting cylinder (320) vertically mounted on the first bracket (310), and a first lifting slide (330) arranged at the output end of the first lifting cylinder (320), wherein test pieces (340) adapted to the electrode columns (620) of the battery cell (600) are symmetrically arranged on both sides of the first lifting slide (330), and the test piece (340) comprises a test rod (341) fixed on the first lifting slide (330), a sleeve (342) is arranged at the bottom of the test rod (341), a sealing member (343) is arranged at the bottom of the sleeve (342), a lifting rod (344) is movably arranged in the sleeve (342), and the lower end of the lifting rod (344) is connected to a test electrode (345) and a conductive liquid filling member (346).

2. A battery capacity detection device according to claim 1, characterized in that: The sealing member (343) comprises a sealing cover (3431) movably sleeved on the lower end of the sleeve (342), an annular air chamber (3432) is provided in the sealing cover (3431), a flexible sealing capsule (3433) is connected to the lower end of the annular air chamber (3432), and a conductive liquid filling cavity (347) for accommodating conductive liquid is formed in the middle of the sealing cover (3431).

3. A battery capacity detection device according to claim 2, characterized in that: The flexible sealing capsule (3433) comprises a bottom sealing sheet (3434) adapted to the upper end surface of the battery sheet (600) and a side sealing sheet (3435) adapted to the outer peripheral surface of the electrode column (620).

4. A battery capacity detection device according to claim 2, characterized in that: The conductive liquid filling member (346) includes a sealing cover (3461) coaxially sleeved on the outside of the test electrode (345), a liquid storage tank (3462) is provided in the sealing cover (3461), a liquid pump (3463) connected to the liquid storage tank (3462) is installed on the upper end surface of the sealing cover (3461), and a vent hole (3467) connected to the conductive liquid filling cavity (347) is also provided on the sealing cover (3461).

5. A battery capacity detection device according to claim 4, characterized in that: The lower end surface of the sealing cover (3461) is provided with an annular flexible filling pipe (3464) connected to the liquid storage tank (3462), and the bottom of the annular flexible filling pipe (3464) is circumferentially provided with a plurality of openings (3465). The outer peripheral surface of the sealing cover (3461) is provided with a sealing ring (3466) adapted to the conductive liquid filling cavity (347).

6. A battery capacity detection device according to claim 1, characterized in that: The battery placement unit (200) further comprises a transverse slide rail (210) fixed on the machine (100) and a transverse slide table (220) slidably mounted on the transverse slide rail (210); the battery placement table (250) is arranged on the transverse slide table (220); a transverse motor (230) is further mounted on the machine (100); an output end of the transverse motor (230) is connected to a transverse screw rod (240); and the transverse slide table (220) is threadedly connected to the transverse screw rod (240).

7. A battery capacity detection device according to claim 6, characterized in that: A plurality of suction cups (270) are further provided in the groove (251), and an air pump (260) connected to each suction cup (270) is installed on one side of the transverse sliding platform (220).

8. The battery capacity detection device according to claim 1, characterized in that: The device further comprises a discharge unit (400), the discharge unit (400) comprising a second bracket (410) fixed on the machine platform (100), a second lifting rail (420) vertically mounted on the second bracket (410), and a second lifting cylinder (430) mounted on the top of the second bracket (410), the output end of the second lifting cylinder (430) being connected to a second lifting platform (440) slidably connected to the second lifting rail (420), and discharge components (450) adapted to the electrode column (620) being symmetrically arranged on both sides of the second lifting platform (440); the discharge component (450) comprising a discharge terminal (451) fixed on the second lifting platform (440), and a discharge electrode (452) being connected to the bottom of the discharge terminal (451).

9. A battery capacity detection device according to claim 8, characterized in that: A heat conducting plate (460) adapted to the upper end face of the battery cell (600) is further provided at the bottom of the second lifting slide (440), a plurality of heat conducting rods (470) are vertically fixed on the heat conducting plate (460), a sleeve (480) slidably adapted to the heat conducting rod (470) is correspondingly provided on the second lifting slide (440), a heat conducting sheet (490) is provided on the upper end face of the heat conducting rod (470), and a heat dissipation plate adapted to the heat conducting sheet (490) is embedded in the second lifting slide (440).

10. A testing method using the battery capacity detection device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Battery positioning: Place the battery sheet (600) in the groove (251) of the battery placement platform (250) so that the protruding portion (610) is embedded in the recessed portion (252) to complete the mechanical positioning; Step 2, lateral calibration: adjusting the lateral position of the battery placement platform (250) so that the electrode column (620) is located directly below the corresponding test piece (340); Step 3: Sealing contact: the first lifting cylinder (320) drives the first lifting slide (330) downward until the sealing member (343) wraps around the electrode column (620) to form a closed cavity; Step 4: Injecting conductive liquid: The conductive liquid filling member (346) injects conductive liquid into the conductive liquid filling cavity (347) to fill the micro gap between the test electrode (345) and the electrode column (620); Step 5, capacity test: applying charge and discharge current through the test electrode (345), collecting voltage / current data, and calculating the actual capacity and SOH value; Step 6: Conductive liquid recovery: After the test is completed, the conductive liquid filling part (346) reverses the suction and recovers the conductive liquid into the liquid storage tank (3462).

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