Battery cell withstand voltage test device

Abstract

The utility model provides a voltage withstanding testing device for a battery cell. The battery cell voltage withstanding testing device comprises a rack, an upper die installed on the rack through a moving module and a lower die corresponding to the upper die up and down, the upper die is provided with a plurality of first clamping grooves distributed in the Y direction, the lower die is provided with second clamping grooves corresponding to the first clamping grooves in a one-to-one mode, and the first clamping grooves are communicated with the second clamping grooves. Clamping mechanisms which are folded or unfolded in the X direction are arranged on the two sides of the lower die, probes corresponding to the second clamping grooves in a one-to-one mode are arranged on one sides of the clamping mechanisms, a first conductive piece is arranged in the first clamping groove, and a second conductive piece is arranged in the second clamping groove; the upper die and the lower die are close to each other, so that the first conductive piece, the second conductive piece and the probe form an electric loop, and the electric loop is electrically connected with a withstand voltage tester. The structure of the upper die and the structure of the lower die are optimized, the first clamping grooves and the second clamping grooves used for clamping the battery cells are formed in the upper die and the lower die, the multiple battery cells can be detected at the same time at a time, and the detection efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cell detection, in particular to a cell withstand voltage testing device. Background Art

[0002] During the manufacturing process of lithium-ion batteries, after the production of the electrode sheets is completed, the positive and negative electrode sheets and the separator are assembled together by winding or stacking, and the separator separates the positive and negative electrode sheets. During the charging and discharging process of the battery, the separator isolates the electron conduction between the positive and negative electrode sheets while allowing lithium ions to pass through. After winding or stacking assembly, the bare cell needs to be hot-pressed to shape the electrode sheets and the separator to make them contact more closely and reduce the lithium ion transmission resistance. During hot pressing, it is often necessary to perform an insulation withstand voltage test on the bare cell. Generally, a withstand voltage tester is used to apply a voltage to the cell. After this voltage lasts for a period of time, the leakage current is detected to see if it remains within the specified range, and whether there is a short circuit between the positive and negative electrodes of the cell is judged.

[0003] During the withstand voltage test, a test device is generally used. Existing side-view devices, such as a cell withstand voltage testing device disclosed in the patent publication number CN219609118U, include a workbench and an ear pressing mechanism. A support plate is arranged on the workbench, and a cell placement surface for lifting the cell to be tested is arranged on the support plate. The ear pressing mechanism includes a pressing block located at one end of the support plate and used for squeezing the ears of the cell to be tested. An extrusion surface for bending the ears towards the top surface of the cell to be tested and fitting the top surface of the cell to be tested is arranged on the pressing block. This test device can only test one cell at a time, and the detection efficiency is relatively low. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a cell withstand voltage testing device, which can detect multiple cells simultaneously at one time and improve the detection efficiency.

[0005] The technical solution of the utility model is: a cell withstand voltage testing device, including a frame, an upper die installed on the frame through a moving module to lift along the Z direction, and a lower die installed beside the frame and corresponding to the upper die up and down. A plurality of first slots arranged along the Y direction are provided on the upper die, and second slots corresponding to the first slots one by one are provided on the lower die. Clamping mechanisms that close or open along the X direction are provided on both sides of the lower die. A probe corresponding to the second slot one by one is provided on one side of the clamping mechanism. A first conductive part is arranged in the first slot, and a second conductive part is arranged in the second slot. When the upper die and the lower die approach each other, the first conductive part, the second conductive part and the probe form an electrical circuit, and this electrical circuit is electrically connected to a withstand voltage tester.

[0006] In the above solution, the structures of the upper die and the lower die are optimized to have a plurality of first slots and second slots for clamping cells, so that multiple cells can be detected simultaneously at one time, improving the detection efficiency.

[0007] Preferably, the cell withstand voltage testing device further includes a protection device disposed beside the frame and electrically connected to the electrical circuit. The protection device includes a base, an induction rod detachably inserted into the base, and a sensor for sensing the induction rod to conduct or disconnect the electrical circuit.

[0008] Preferably, a first jack is provided on the lower die, and a second jack for inserting the induction rod is provided on the base. The sensor includes an optical fiber sensor and a proximity switch. The optical fiber sensor is disposed on the side wall of the second jack, and the probe of the optical fiber sensor extends into the second jack. The proximity switch is disposed on the lower die and beside the first jack. When the induction rod is placed in the second jack, the electrical circuit is conducted. When the induction rod is placed in the first jack, the electrical circuit is disconnected.

[0009] Preferably, the cell withstand voltage testing device further includes a base. The clamping mechanism is installed on the base through a lifting mechanism. The lower die is disposed on the top of the base. The lifting mechanism and the clamping mechanism are respectively electrically connected to a solenoid valve.

[0010] Preferably, the clamping mechanism includes a first cylinder, a first clamping block, and a second clamping block. The first cylinders are respectively disposed on both sides of the lower die. The power output end of the first cylinder on one side is connected to the first clamping block, and the power output end of the first cylinder on the other side is connected to the second clamping block. The probe is disposed on the first clamping block. The surfaces of the first clamping block and the second clamping block facing each other form a clamping surface.

[0011] Preferably, the second clamping block is provided with third slots corresponding to the second slots one by one. Both the second slots and the third slots are semicircular. The radius of the third slot is smaller than the radius of the second slot.

[0012] Preferably, the first conductive member and the second conductive member have opposite electrodes.

[0013] Compared with the related art, the beneficial effects of the present utility model are as follows:

[0014] First, the structures of the upper die and the lower die are optimized to have a plurality of first slots and second slots for clamping cells, enabling simultaneous detection of multiple cells at one time and improving the detection efficiency.

[0015] Second, a first conductive member is disposed in the first slot, and a second conductive member is disposed in the second slot. On the one hand, it can realize the conduction of the electrical circuit, which is beneficial for testing. On the other hand, the conductive member is made of conductive foam, which does not damage the cell when the upper and lower dies are clamped.

[0016] III. Add a protection device to realize the on / off of the electrical circuit. When it is turned off, it is convenient for the maintenance of the work station and ensures the safety during the changeover operation.

[0017] IV. The clamping mechanism and the lifting mechanism are controlled by solenoid valves, with precise control. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the cell withstand voltage test device provided by the present utility model.

[0019] Figure 2 is Figure 1 the enlarged view at A in

[0020] In the drawings: 1, frame; 2, moving module; 3, upper mold; 31, first card slot; 32, first conductive part; 4, lower mold; 41, second card slot; 42, second conductive part; 43, first jack; 5, lifting mechanism; 6, protection device; 61, base; 62, sensor; 621, fiber optic sensor; 622, proximity switch; 63, induction rod; 64, second jack; 7, withstand voltage tester; 8, clamping mechanism; 81, probe; 82, first cylinder; 83, first clamping block; 84, second clamping block; 85, third card slot; 9, base; 10, solenoid valve; 11, cell; 12, workbench. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present utility model will be described in detail below with reference to the drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. For the convenience of description, words such as "upper", "lower", "left", and "right" hereinafter only indicate the same direction as the upper, lower, left, and right directions of the drawings themselves, and do not limit the structure.

[0022] As Figure 1 , Figure 2 shown, a cell withstand voltage test device provided in this embodiment can be integrally installed on the workbench 12 of the work station. The cell withstand voltage test device includes a frame 1, a moving module 2, an upper mold 3, a lower mold 4, a lifting mechanism 5, a protection device 6, a withstand voltage tester 7, a clamping mechanism 8, a base 9, and a solenoid valve 10.

[0023] It is assumed that the workbench 12 has three directions of X, Y, and Z. The frame 1 is a vertical structure and is installed on the workbench 12 through bolts at the bottom. A moving module 2 is installed on the frame 1. The moving module 2 is a Z-direction moving module (purchased part), and the upper mold 3 is installed at its working end.

[0024] The base 9 is mounted on the workbench 12 by bolts, and the base 9 and the frame 1 are arranged adjacent to each other in the X direction. A lower mold 4 is mounted on the top of the base 9. The upper mold 3 corresponds to the position of the lower mold 4.

[0025] A plurality of first card slots 31 arranged along the Y direction are provided on the upper mold 3. Second card slots 41 corresponding to the first card slots 31 one by one are provided on the lower mold 4. Both the first card slots 31 and the second card slots 41 are semi-circular and are used to adapt to the battery cell 11. A first conductive member 32 is provided in the first card slot 31, and a second conductive member 42 is provided in the second card slot 41. The first conductive member 32 and the second conductive member 42 have opposite polarities. For example, if the first conductive member 32 is the positive electrode, then the second conductive member 42 is the negative electrode. Both the first conductive member 32 and the second conductive member 42 are conductive foam. A first jack 43 for placing the induction rod 63 of the protection device 6 is provided on the lower mold 4.

[0026] A lifting mechanism 5 is provided on the base 9. The lifting mechanism 5 is a cylinder, and one is provided on each of the two sides of the base 9 in the X direction. The lifting mechanism 5 expands and contracts along the Z direction.

[0027] The clamping mechanism 8 includes a probe 81, a first cylinder 82, a first clamping block 83, a second clamping block 84, and a third card slot 85. The power output end of the lifting mechanism 5 is connected to the first cylinder 82, and the first cylinder 82 expands and contracts along the X direction. The two first cylinders 82 at both ends clamp towards each other in the X direction. The power output end of one of the first cylinders 82 is connected to the first clamping block 83, and the power output end of the other first cylinder 82 is connected to the second clamping block 84. The surfaces of the first clamping block 83 and the second clamping block 84 that are close to each other are clamping surfaces. A plurality of probes 81 are arranged on the clamping surface of the first clamping block 83, and the plurality of probes 81 correspond to the second card slots 41 one by one. A third card slot 85 corresponding to the second card slot 41 one by one is provided on the second clamping block 84. Both the second card slot 41 and the third card slot 85 are semi-circular. The radius of the third card slot 85 is smaller than the radius of the second card slot 41. The inner side surface of the third card slot 85 is the clamping surface that abuts against and clamps the end of the battery cell 11. The actions of the lifting mechanism 5 and the clamping mechanism 8 are controlled by a solenoid valve 10.

[0028] In this embodiment, the number of the first card slots 31, the second card slots 41, and the third card slots 85 is four each, and four cylindrical battery cells 11 can be tested simultaneously. During use, the battery cells 11 are placed in the second card slots 41, and then the moving module 2 is activated to lower the upper die 3. The battery cells 11 are clamped by the first card slots 31 and the second card slots 41. At this time, the first conductive member 32 and the second conductive member 42 are in contact with the battery cells 11. Then, the lifting mechanism 5 and the clamping mechanism 8 are activated respectively, so that the first clamping block 83 and the second clamping block 84 are lifted to clamp both ends of the battery cells 11, and the probes 81 are in contact with the battery cells 11. The first conductive member 32, the second conductive member 42, and the probes 81 form an electrical circuit, and this electrical circuit is electrically connected to the withstand voltage tester 7 to perform a withstand voltage test on the battery cells 11. The withstand voltage tester 7 detects the withstand voltage test strength on the surface of the battery cells 11 by the upper and lower mold clamping of the positive and negative electrodes, and feeds back the withstand voltage test data on the surface of the battery cells 11.

[0029] The protection device 6 is arranged beside the frame 1 and is electrically connected to the electrical circuit. The protection device 6 includes a base 61, an induction rod 63 detachably inserted into the base 61, and a sensor 62 for sensing the induction rod 63 to conduct or disconnect the electrical circuit.

[0030] The base 61 is provided with a second jack 64 for inserting the induction rod 63. The sensor 62 includes an optical fiber sensor 621 and a proximity switch 622. The optical fiber sensor 621 is arranged on the side wall of the second jack 64, and the probe of the optical fiber sensor 621 extends into the second jack 64. The proximity switch 622 is arranged on the lower die 4 and beside the first jack 43. When the induction rod 63 is placed in the second jack 64, the electrical circuit is conducted. When the induction rod 63 is placed in the first jack 43, the electrical circuit is disconnected.

[0031] During the withstand voltage test, the induction rod 63 is placed in the second jack 64. After being sensed by the optical fiber sensor 621, the test electrical circuit is conducted. When the test device needs to be maintained or replaced, the induction rod 63 is pulled out from the second jack 64 and placed in the first jack 43. The proximity switch 622 is sensed, and there is no induction signal from the optical fiber sensor 621. At this time, the test electrical circuit is disconnected.

[0032] The utility model solves the problem of the insulation withstand voltage test on the surface of the cylinder of a cylindrical battery cell after printing on the cylinder surface in a battery cell production line. During the test, only by using a handling mechanism (such as a manipulator) to place the battery cell in the test device and connecting the withstand voltage tester, and by the way of the upper and lower mold clamping and connection of the positive and negative electrodes of the test device, the test on the incoming battery cell can be controlled by the PLC electrically, so as to achieve the linkage of the processes on the production line.

[0033] The above are only embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present utility model.

Claims

1. A battery cell withstand voltage test device, comprising a frame (1), an upper mold (3) mounted on the frame (1) via a movable module (2) so as to be lifted and lowered in the Z direction, and a lower mold (4) mounted on the side of the frame (1) and corresponding to the upper mold (3) in the upper and lower directions, characterized in that: The upper mold (3) is provided with a plurality of first slots (31) arranged along the Y direction, the lower mold (4) is provided with second slots (41) corresponding one to one with the first slots (31), the lower mold (4) is provided with clamping mechanisms (8) which close or open along the X direction on both sides, one side of the clamping mechanism (8) is provided with probes (81) corresponding one to one with the second slots (41), the first slots (31) are provided with first conductive parts (32), the second slots (41) are provided with second conductive parts (42), the upper mold (3) and the lower mold (4) are brought close to each other so that the first conductive parts (32), the second conductive parts (42) and the probes (81) form an electrical circuit, and the electrical circuit is electrically connected to a withstand voltage tester (7).

2. The battery cell withstand voltage test device according to claim 1, characterized in that: It also includes a protection device (6) disposed on the side of the frame (1) and electrically connected to the electrical circuit, the protection device (6) comprising a base (61), a sensing rod (63) detachably inserted on the base (61), and a sensor (62) for sensing the sensing rod (63) to switch on or off the electrical circuit.

3. The battery cell withstand voltage test device according to claim 2, characterized in that: The lower mold (4) is provided with a first plug hole (43), the base (61) is provided with a second plug hole (64) for inserting the sensing rod (63), the sensor (62) comprises an optical fiber sensor (621) and a proximity switch (622), the optical fiber sensor (621) is arranged on the side wall of the second plug hole (64), and the probe of the optical fiber sensor (621) extends into the second plug hole (64), the proximity switch (622) is arranged on the lower mold (4) and is placed beside the first plug hole (43), when the sensing rod (63) is placed in the second plug hole (64), the electrical circuit is turned on, and when the sensing rod (63) is placed in the first plug hole (43), the electrical circuit is turned off.

4. The battery cell withstand voltage test device according to claim 1, characterized in that: It also includes a base (9), a clamping mechanism (8) is installed on the base (9) via a lifting mechanism (5), the lower mold (4) is arranged on the top of the base (9), and the lifting mechanism (5) and the clamping mechanism (8) are respectively electrically connected to the solenoid valve (10).

5. The battery cell withstand voltage test device according to claim 4, characterized in that: The clamping mechanism (8) comprises a first cylinder (82), a first clamping block (83) and a second clamping block (84); the first cylinder (82) is arranged on both sides of the lower mold (4); a power output end of the first cylinder (82) on one side is connected to the first clamping block (83); and a power output end of the first cylinder (82) on the other side is connected to the second clamping block (84); the probe (81) is arranged on the first clamping block (83); and surfaces of the first clamping block (83) and the second clamping block (84) that are close to each other form a clamping surface.

6. The battery cell withstand voltage test device according to claim 5, characterized in that: The second clamping block (84) is provided with a third clamping slot (85) corresponding one-to-one to the second clamping slot (41); the second clamping slot (41) and the third clamping slot (85) are both semicircular; and the radius of the third clamping slot (85) is smaller than the radius of the second clamping slot (41).

7. The battery cell withstand voltage test device according to claim 1, characterized in that: The first conductive member (32) and the second conductive member (42) have opposite electrodes.

8. The battery cell withstand voltage test device according to claim 1, characterized in that: The first conductive member (32) and the second conductive member (42) are both conductive foam.

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