Lithium battery cell internal resistance tester

Abstract

The lithium battery cell internal resistance tester comprises a workbench, a tester, a cell and a mounting plate, the tester is fixedly mounted on the upper surface of the workbench, an electric push rod and a telescopic rod are fixedly mounted on the lower surface of the mounting plate, and the bottom ends of the electric push rod and the telescopic rod are fixedly arranged on the upper surface of the workbench; the upper surface of the mounting plate is slidably provided with a mounting block, the upper surface of the mounting block is provided with two groups of fixing assemblies for fixing the battery cell, and the upper surface of the mounting plate is provided with a moving assembly for driving the battery cell to move into the tester. According to the utility model, a battery cell is placed in the two groups of clamping plates, then is inserted into the positioning holes through the spring plungers, is limited through the limiting plate, and is moved into the two groups of guide rods through the two groups of testing heads, so that the battery cell is driven to move into the moving groove under the action of the moving assembly; and the internal resistance of the battery cell is tested through the tester, so that a worker does not need to hold a meter pen by hand for testing, and the worker is prevented from being hurt.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery testing, in particular to a lithium battery cell internal resistance tester. Background Art

[0002] Lithium-ion batteries have become one of the main power sources for portable electronic products such as mobile communications and laptops due to their high specific energy, high voltage, and high energy density. However, the current batteries need to be tested for internal resistance after production to test whether the connection quality is up to standard, in order to prevent the resistance from being too high and the voltage division from being too much, which will affect the output of the supply voltage. Testing the internal resistance of the welded battery cells can effectively detect quality problems and ensure the safety of the finished products.

[0003] At present, the internal resistance and voltage tests of lithium-ion battery cells are all done manually, using a test lead directly. This approach is very risky. When using a tester for testing, the height of the test points is different for lithium battery cells of different thicknesses, which results in the lithium battery cells being unable to smoothly enter the tester, and further makes it impossible to test lithium battery cells of different thicknesses. Therefore, we need to propose a lithium battery cell internal resistance tester. Utility Model Content

[0004] The utility model aims to provide a lithium battery cell internal resistance tester, which places the cell inside two groups of clamping plates, inserts a spring plunger into a positioning hole, and limits the cell through a limit plate, and an electric push rod drives the mounting plate to move up and down, thereby driving the cell to move up and down, and moves to the inside of two groups of guide rods through two groups of test heads, thereby driving the cell to move to the inside of a moving groove under the action of a moving assembly, and performs an internal resistance test on the cell through a tester, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A lithium battery cell internal resistance tester comprises a workbench, a tester, a battery cell and a mounting plate, wherein the tester is fixedly mounted on the upper surface of the workbench, an electric push rod and a telescopic rod are fixedly mounted on the lower surface of the mounting plate, and the bottom ends of the electric push rod and the telescopic rod are fixedly mounted on the upper surface of the workbench, a mounting block is slidably mounted on the upper surface of the mounting plate, two groups of fixing components for fixing the battery cell are mounted on the upper surface of the mounting block, and a moving component for driving the battery cell to move into the tester is mounted on the upper surface of the mounting plate.

[0007] Preferably, the fixing assembly includes a limit plate, a spring plunger and a clamping plate, the limit plate is rotatably arranged on the upper surface of the clamping plate, the spring plunger is fixedly installed on the lower surface of the limit plate, and a positioning hole corresponding to the spring plunger is opened on the upper surface of the clamping plate.

[0008] Preferably, the fixing assembly includes a servo motor, a first support plate, a screw rod and a second support plate, the servo motor is bolted to the upper surface of the mounting plate, the screw rod is keyed to the output end of the servo motor, and the first support plate and the second support plate are both fixedly mounted on the upper surface of the mounting plate.

[0009] Preferably, the screw rod is rotatably disposed on corresponding surfaces of the first support plate and the second support plate, and the screw rod thread passes through the mounting block.

[0010] Preferably, a clamping protrusion is fixedly mounted on the lower surface of the mounting block, and a clamping groove corresponding to the clamping protrusion is provided inside the mounting plate.

[0011] Preferably, test heads are provided at both ends of the battery cell, and two groups of movable grooves corresponding to the test heads are opened inside the battery cell, and guide rods corresponding to the test heads are fixedly installed on the sides of the two groups of movable grooves.

[0012] Preferably, the mounting plate is arranged inside the tester, and the limiting plate and the clamping plate are not in contact with the tester.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] (1) The utility model places the battery cell inside two sets of clamping plates, inserts a spring plunger into the positioning hole, limits the battery cell by the limiting plate, moves the two sets of test heads into the two sets of guide rods, and drives the battery cell to move into the moving slot under the action of the moving assembly, and performs an internal resistance test on the battery cell by the tester, thereby avoiding the need for workers to hold test pens for testing, thereby ensuring that workers are not injured;

[0015] (2) In the present invention, when the thickness of the battery changes, the electric push rod drives the mounting plate to move up and down, thereby driving the battery cell to move up and down, and the two sets of test heads move into the two sets of guide rods and enter the tester for testing, so that the tester is suitable for battery cells of different thicknesses, thereby improving the applicability of the overall tester. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 for Figure 1 A magnified view of the structure at center A;

[0018] Figure 3 It is a schematic diagram of the structure above the mounting plate in the utility model;

[0019] Figure 4It is an exploded view of the structure above the mounting plate in the utility model.

[0020] In the figure: 1. workbench; 2. electric push rod; 3. tester; 4. battery cell; 5. mounting block; 6. servo motor; 7. mounting plate; 8. telescopic rod; 9. first support plate; 10. limit plate; 11. spring plunger; 12. clamping plate; 13. positioning hole; 14. screw rod; 15. second support plate; 16. test head; 17. clamping protrusion; 18. guide rod; 19. moving groove; 20. clamping groove. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] like Figure 1-4 As shown, a lithium battery cell internal resistance tester includes a workbench 1, a tester 3, a battery cell 4 and a mounting plate 7. The tester 3 is fixedly mounted on the upper surface of the workbench 1, and an electric push rod 2 and a telescopic rod 8 are fixedly mounted on the lower surface of the mounting plate 7, and the bottom ends of the electric push rod 2 and the telescopic rod 8 are fixedly mounted on the upper surface of the workbench 1. A mounting block 5 is slidably arranged on the upper surface of the mounting plate 7, and two groups of fixing components for fixing the battery cell 4 are arranged on the upper surface of the mounting block 5. A moving component for driving the battery cell 4 to move into the tester 3 is arranged on the upper surface of the mounting plate 7. When the thickness of the battery cell 4 changes, in order to ensure that the test head 16 can effectively enter the moving groove 19, the mounting plate 7 is driven up and down by the electric push rod 2 to make the test head 16 parallel to the moving groove 19, and the telescopic rod 8 is arranged to support the mounting plate 7 while ensuring that the mounting plate 7 can move up and down.

[0023] Specifically, the fixing assembly includes a limit plate 10, a spring plunger 11 and a clamping plate 12. The limit plate 10 is rotatably arranged on the upper surface of the clamping plate 12, the spring plunger 11 is fixedly installed on the lower surface of the limit plate 10, and a positioning hole 13 corresponding to the spring plunger 11 is opened on the upper surface of the clamping plate 12. The above design places the battery cell 4 inside the clamping plate 12, and the inside of the clamping plate 12 is set to an inverted trapezoid, so as to ensure that the inside of the clamping plate 12 can prevent battery cells 4 of different thicknesses, and after the battery cell 4 is placed inside the clamping plate 12, the limit plate 10 is rotated so that the spring plunger 11 at the bottom of the limit plate 10 is clamped into the positioning hole 13, so that the battery cell 4 is limited by the limit plate 10 to prevent the battery cell 4 from detaching from the top of the clamping plate 12, thereby ensuring that the battery cell 4 can enter the tester 3.

[0024] Specifically, the fixed component includes a servo motor 6, a first support plate 9, a screw rod 14 and a second support plate 15. The servo motor 6 is bolted to the upper surface of the mounting plate 7, the screw rod 14 is keyed to the output end of the servo motor 6, and the first support plate 9 and the second support plate 15 are both fixedly mounted on the upper surface of the mounting plate 7. The output end of the servo motor 6 is fixedly connected with a rotating shaft, and is keyed to the screw rod 14 through the rotating shaft, so that when the servo motor 6 rotates, the screw rod 14 is driven to rotate.

[0025] Specifically, the screw rod 14 is rotatably arranged on the corresponding surfaces of the first support plate 9 and the second support plate 15, and the screw rod 14 threadably penetrates the mounting block 5, the rotating shaft of the servo motor 6 rotatably penetrates the first support plate 9, the rotating shaft is key-connected with the screw rod 14 on the side of the first support plate 9 away from the servo motor 6, and the other end of the screw rod 14 is rotatably arranged on the side of the second support plate 15 close to the servo motor 6, so that the rotating shaft and the screw rod 14 are supported by the first support plate 9 and the second support plate 15, thereby ensuring the stability of the screw rod 14 during rotation.

[0026] Specifically, a snap-fit ​​protrusion 17 is fixedly installed on the lower surface of the mounting block 5, and a snap-fit ​​groove 20 corresponding to the snap-fit ​​protrusion 17 is opened inside the mounting plate 7. The snap-fit ​​protrusion 17 is configured as a convex block, and the snap-fit ​​protrusion 17 moves inside the snap-fit ​​groove 20, thereby preventing the mounting block 5 from detaching from the upper surface of the mounting plate 7. At the same time, it ensures that the mounting block 5 can move in a straight line along the snap-fit ​​groove 20 when the screw rod 14 rotates, thereby driving the battery cell 4 above the mounting block 5 to move into the tester 3 and perform an internal resistance test on the battery cell 4.

[0027] Specifically, test heads 16 are provided at both ends of the battery cell 4, and two groups of movable grooves 19 corresponding to the test heads 16 are opened inside the battery cell 4, and guide rods 18 corresponding to the test heads 16 are fixedly installed on the sides of the two groups of movable grooves 19. The test head 16 slides into the test end through the movable grooves 19, and then the battery cell 4 is tested by the tester 3, and each group of guide rods 18 is two groups of straight rods, and the distance between the two groups of straight rods is consistent with the diameter of the test head 16, so as to ensure that the test head 16 is stuck in the two groups of straight rods, and while limiting the test head 16, it is ensured that the test head 16 can smoothly enter the movable groove 19.

[0028] Specifically, the mounting plate 7 is arranged inside the tester 3, and the limit plate 10 and the clamping plate 12 are not in contact with the tester 3, thereby ensuring that when the mounting block 5 moves, the limit plate 10 and the clamping plate 12 will not be scratched with the tester 3, thereby ensuring the smoothness of the internal resistance test.

[0029] Working principle: Start the servo motor 6 to drive the mounting block 5 to move out of the tester 3, take out the tested battery cell 4, and then put the new battery cell 4 into the clamping plate 12, and then rotate the limit plate 10 to make the spring plunger 11 snap into the positioning hole 13, so as to limit the battery cell 4, and then drive the mounting plate 7 to move up and down through the electric push rod 2, thereby driving the test head 16 to move up and down parallel to the moving groove 19, and then start the servo motor 6 to drive the screw rod 14 to rotate, thereby driving the mounting block 5 to move to the bottom of the tester 3, thereby ensuring that the test head 16 is snapped into the test port along the moving groove 19, and the internal resistance of the battery cell 4 is tested by the tester 3, thereby avoiding the need for the staff to hold the test lead for testing, thereby ensuring that the staff is not injured, and making the tester 3 suitable for battery cells 4 of different thicknesses, thereby improving the applicability of the overall tester 3.

[0030] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lithium battery cell internal resistance tester, characterized in that: It includes a workbench, a tester, a battery cell and a mounting plate, the tester is fixedly mounted on the upper surface of the workbench, an electric push rod and a telescopic rod are fixedly mounted on the lower surface of the mounting plate, and the bottom ends of the electric push rod and the telescopic rod are fixedly mounted on the upper surface of the workbench, a mounting block is slidably mounted on the upper surface of the mounting plate, two groups of fixing components for fixing the battery cell are mounted on the upper surface of the mounting block, and a moving component for driving the battery cell to move into the tester is mounted on the upper surface of the mounting plate.

2. A lithium battery cell internal resistance tester according to claim 1, characterized in that: The fixing assembly includes a limit plate, a spring plunger and a clamping plate. The limit plate is rotatably arranged on the upper surface of the clamping plate, the spring plunger is fixedly installed on the lower surface of the limit plate, and a positioning hole corresponding to the spring plunger is opened on the upper surface of the clamping plate.

3. A lithium battery cell internal resistance tester according to claim 2, characterized in that: The fixing assembly includes a servo motor, a first support plate, a screw and a second support plate. The servo motor is bolted to the upper surface of the mounting plate. The screw key is connected to the output end of the servo motor. The first support plate and the second support plate are both fixedly mounted on the upper surface of the mounting plate.

4. A lithium battery cell internal resistance tester according to claim 3, characterized in that: The screw rod is rotatably arranged on the corresponding surfaces of the first support plate and the second support plate, and the screw rod thread passes through the mounting block.

5. A lithium battery cell internal resistance tester according to claim 1, characterized in that: A clamping protrusion is fixedly mounted on the lower surface of the mounting block, and a clamping groove corresponding to the clamping protrusion is provided inside the mounting plate.

6. A lithium battery cell internal resistance tester according to claim 1, characterized in that: Both ends of the battery cell are provided with test heads, and two groups of movable grooves corresponding to the test heads are opened inside the battery cell, and guide rods corresponding to the test heads are fixedly installed on the sides of the two groups of movable grooves.

7. A lithium battery cell internal resistance tester according to claim 2, characterized in that: The mounting plate is arranged inside the tester, and the limiting plate and the clamping plate are not in contact with the tester.

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