Clamping device for storage battery test

Abstract

The invention relates to a clamping device for storage battery testing, and belongs to the technical field of storage battery manufacturing. The battery is clamped through the pull rod and the pressurizing screw rod, and the thickness of the square battery in the testing process can be kept; the battery is separated by the metal partition plate, the temperature consistency in the test process is improved, the connection and disconnection of the battery and equipment are facilitated by the pressing lock catch type test terminal, and the structures such as the battery, the test terminal, the pull rod and the pressurizing screw rod are limited through the structural design, so that the test accuracy is ensured. According to the invention, the thickness consistency after testing can be effectively ensured, the battery testing temperature uniformity is improved, and the impedance consistency of a testing line is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery manufacturing, and particularly relates to a clamping device for battery testing. Background Art

[0002] After the production of square battery monomers, it is necessary to test their electrical performance for consistency screening. In the existing testing devices, the connection of battery terminal posts is usually achieved by using terminals and nuts, which is cumbersome to operate and may cause poor contact. In addition, during the testing process of square battery monomers, a fixture is required to clamp them to ensure the tight fit inside the battery core and suppress the expansion in the thickness direction of the battery monomer. Currently, during the testing process of the battery, a pull-rod type fixture is usually used, and a handwheel is used to drive the pull-rod to clamp the battery monomer. This clamping method cannot quantify the clamping pressure, resulting in different thickness expansions of the batteries tested with different fixtures and certain differences in performance. In addition, the heat conduction ability of the existing testing devices is also poor, and heat accumulation will occur during the testing process of the battery, affecting the accuracy of the test data and thus the electrical performance screening results. Summary of the Invention

[0003] The present invention provides a clamping device for battery testing, which clamps the test battery by applying a fixed torque pressure, suppresses the expansion of the square battery in the thickness direction, and ensures the consistency of the thickness among a large number of individual batteries; uses a porous metal clamping plate to improve the heat conduction and heat convection capabilities, maintain the temperature uniformity of each test monomer, and thus improve the consistency of the test results; adopts a downward pressing and locking connection method to ensure connection stability while improving the test efficiency of the monomer. The device has low cost, simple structure, good universality and durability.

[0004] The above object of the present invention is mainly achieved by the following technical solutions:

[0005] A clamping device for battery testing includes a battery slot assembly, a base, a first universal clamping plate, a pull-rod, a second universal clamping plate, a third universal clamping plate, a pressure screw, test terminals, a partition plate, a fourth universal clamping plate, a second partition plate, and an electrode seat. Among them, the battery slot assembly is used to fix the battery. Multiple battery slot assemblies are separated by the fourth universal clamping plate. The two ends are respectively the first universal clamping plate and the second universal clamping plate, the side wall surfaces are respectively the partition plate and the second partition plate, the bottom is the base, and the top is the electrode seat, forming a box-shaped structure; the base is connected to the first universal clamping plate through the pull-rod, and the pull-rod penetrates through the clamping device to provide a pulling force; the second universal clamping plate is provided with a pressure screw for applying a pressing force to clamp the battery; the third universal clamping plate is provided with through holes through which the pull-rod and the pressure screw pass, for limiting the pull-rod and the pressure screw; the electrode seat is provided with test terminals for connecting the test equipment and the battery terminal posts.

[0006] It also includes a connecting piece and a bushing, wherein the two ends of the connecting piece are respectively connected to adjacent clamping plates, a plurality of bushings are arranged on the connecting piece, and the connecting piece is connected to the first universal clamping plate, the second universal clamping plate, and the fourth universal clamping plate through the bushings.

[0007] It also includes a bearing flange and a flange. The bearing flange is arranged on the second universal clamping plate and is connected to the pressure screw to cooperate with the pressure screw to apply a clamping force. The flange is arranged on the third universal clamping plate to limit the pressure screw.

[0008] The bearing flange is provided with a one-way thrust ball bearing for cooperating with the pressure screw to apply a clamping force.

[0009] It also includes a nut, a washer and a spring washer, which are arranged on the third universal clamping plate and are used to fix the pull rod.

[0010] It also includes a battery pad, which is arranged under the battery and is used to adjust the height of the battery and fix it so that the battery pole can contact the test terminal without shifting.

[0011] It also includes a threaded steel sleeve, which is arranged at the center of the battery pad to facilitate the removal and placement of the battery pad.

[0012] It also includes a spring, which is arranged on the partition and the second partition and is used to open the fourth universal clamping plate when the pressure screw is loosened to facilitate the removal of batteries.

[0013] It also includes a locking rod, an electrode seat insulating part and a lock. The test terminal is a push-down lock type test terminal. The locking rod and the lock are arranged on the second partition, and the electrode seat insulating part is arranged on the electrode seat. When the test terminal is pressed down, the locking rod and the lock lock the electrode seat insulating part to achieve close contact between the test terminal and the battery pole during the test process.

[0014] It also includes a pin and a hinge, which are arranged on the partition and are used to achieve contact and separation between the test terminal and the battery pole.

[0015] It also includes an electrode travel pad and a crimping terminal. The electrode travel pad is arranged on the electrode seat, and the test terminal is connected to the test cable through the crimping terminal.

[0016] The fourth universal clamping plate is a metal plate, and a plurality of through holes are arranged on the upper surface of the fourth universal clamping plate to increase heat convection.

[0017] A battery testing method for a clamping device comprises the following steps:

[0018] (1) Remove the battery pole protection cap and place it into the battery slot assembly according to polarity;

[0019] (2) Rotate the pressure screw until the set torque is reached;

[0020] (3) Press down the electrode seat to make the spring end of the test terminal closely contact the battery terminal.

[0021] (4) Conduct electrical performance tests according to the predetermined test procedures.

[0022] (5) After the test procedures are completed, separate the spring end of the test terminal from the battery terminal.

[0023] (6) Remove the battery from the battery slot assembly, install the protective cap for the battery terminal, and complete the test.

[0024] The present invention has at least the following beneficial effects compared with the prior art:

[0025] (1) The present invention adopts a clamping device that can apply torque to maintain the thickness of the square battery during the test; uses a metal heat dissipation plate to connect each battery to improve the temperature consistency during the test, and adopts a press-down lock-type test terminal to facilitate the connection and disconnection between the battery and the device.

[0026] (2) The present invention can effectively ensure the thickness consistency after the test, improve the temperature uniformity of the battery test, and ensure the impedance consistency of the test circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a top view of the clamping device for battery testing of the present invention;

[0028] Figure 2 is a front view of the clamping device for battery testing of the present invention;

[0029] Figure 3 is a left view of the clamping device for battery testing of the present invention;

[0030] Figure 4 is an enlarged top view of the clamping device for battery testing of the present invention;

[0031] Figure 5 is a schematic structural view of the clamping device for battery testing of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] The following further describes the present invention in detail with reference to the drawings and specific embodiments:

[0033] Connect the base 2 and the workbench with screws to fix the whole device on the tabletop;

[0034] As Figures 1-5As shown in the figure, a clamping device for battery testing includes a battery slot assembly 1, a base 2, a first universal clamping plate 3, a pull rod 4, a special square nut 5, a connecting piece 6, a bushing 7, a second universal clamping plate 8, a bearing flange 9, a third universal clamping plate 10, a flange 11, a nut 12, a pressure screw 13, a screw 14, a single-direction thrust ball bearing 15, a nut 16, a washer 17, a spring washer 18, a nut 19, a test terminal 21, a partition 22, a battery cushion block 23, a fourth universal clamping plate 24, a second partition 25, a spring 26, a latch rod 27, a pin 28, a hinge 29, an electrode seat 30, an electrode stroke cushion block 31, a crimping terminal 32, an electrode seat insulator 33, a latch 34, a screw 35, a positive electrode wire 36, a negative electrode wire 37, and a nylon tie strap 38. The battery slot assembly 1 is used to fix the battery 20. Multiple battery slot assemblies 1 are separated by the fourth universal clamping plate 24. The ends are respectively the first universal clamping plate 3 and the second universal clamping plate 8. The side wall surfaces are respectively the partition 22 and the second partition 25. The bottom is the base 2, and the top is the electrode seat 30, forming a box-shaped structure. The base 2 is connected to the first universal clamping plate 3 through the pull rod 4. The pull rod 4 penetrates the clamping device and is used to provide a tension force. The second universal clamping plate 8 is provided with a pressure screw 13, which is used to apply a pressing force to clamp the battery 20. The third universal clamping plate 10 is provided with a through hole, and the pull rod 4 and the pressure screw 13 pass through the through hole, which is used to limit the pull rod 4 and the pressure screw 13. The electrode seat 30 is provided with a test terminal 21, which is used to connect the test equipment and the battery 20 pole column.

[0035] The first universal clamping plate 3 is provided with a special square nut 5, which is used to fix the pull rod 4;

[0036] Both ends of the connecting piece 6 are respectively connected to the first universal clamping plate 3 and the second universal clamping plate 8. Multiple bushings 7 are arranged on the connecting piece 6. The connecting piece 6 is connected to the fourth universal clamping plate 24 through the bushings 7.

[0037] The bearing flange 9 is arranged on the second universal clamping plate 8 and is connected to the pressure screw 13, which is used to cooperate with the pressure screw 13 to apply a pressing force. The flange 11 is arranged on the third universal clamping plate 10, which is used to limit the pressure screw 13.

[0038] The pressure screw 13 is provided with a nut 12. The pressure screw 13 is installed through the nut 12, and the tail can apply a fixed torque with a torque wrench, etc. The screw 14 is used to fix the bearing flange 9 on the second universal clamping plate 8. The nut 19 is installed on the battery pole column and is used to connect the test terminal 21.

[0039] The bearing flange 9 is provided with a single-direction thrust ball bearing 15, which is used to cooperate with the pressure screw 13 to apply a clamping force.

[0040] The nut 16, the washer 17, and the spring washer 18 are arranged on the third universal clamping plate 10, which is used to fix the pull rod 4.

[0041] The battery pad 23 is disposed below the battery 20 and is used to adjust the height of the battery and fix it so that the battery pole can contact the test terminal 21 without displacement.

[0042] The threaded steel sleeve 39 is arranged at the center of the battery cushion block 23 to facilitate the removal and placement of the battery cushion block 23 .

[0043] The spring 26 is disposed on the partition 22 and the second partition 25 , and is used to prop open the fourth universal clamping plate 24 when the pressure screw 13 is loosened, so as to facilitate the removal of the battery 20 .

[0044] The fourth universal clamping plate 24 is a metal plate, and a plurality of through holes are disposed on the upper surface of the fourth universal clamping plate 24 to increase heat convection.

[0045] The test terminal 21 is a push-down lock type test terminal, the lock rod 27 and the lock 34 are arranged on the second partition 25, and the electrode seat insulating part 33 is arranged on the electrode seat 30. When the test terminal 21 is pressed down, the lock rod 27 and the lock 34 lock the electrode seat insulating part 33, so as to achieve close contact between the test terminal 21 and the battery pole during the test process.

[0046] The pin 28 and the hinge 29 are arranged on the partition 22 to realize the contact and separation between the test terminal 21 and the battery pole.

[0047] The electrode travel pad 31 is disposed on the electrode seat 30 , and the test terminal 21 is connected to the test cable through the crimping terminal 32 .

[0048] The positive electrode lead 36 and the negative electrode lead 37 are fixed by nylon cable ties 38 .

[0049] The working principle of the present invention is as follows:

[0050] The first step is to place the battery: remove the battery pole protection cap and place it into the battery slot assembly 1 according to the polarity.

[0051] The second step is clamping: using a torque wrench or an electric torque screwdriver or other tool, the pressure screw 13 is rotated until the set torque is reached.

[0052] The third step is to connect the test terminal: press down the electrode holder insulating part 33 until the lock 34 locks the electrode holder insulating part 33, and the spring end of the test terminal 21 is in close contact with the battery pole.

[0053] Step 4: Start the test procedure: perform electrical performance test according to the predetermined test procedure.

[0054] Step 5, release the test terminal: After the test program is finished, turn the lock 34 to make the electrode seat insulating part 33 pop up and the spring end of the test terminal 21 detach from the battery pole.

[0055] Step 6: Remove the battery: Remove the battery from the battery slot assembly 1, install the battery terminal protection cap, and complete the test.

[0056] The present invention adopts a clamping device that can apply torque, which can maintain the thickness of the square battery during the test; uses a metal heat dissipation plate to connect each battery to improve the temperature consistency during the test, and adopts a pressing lock type test terminal to facilitate the connection and disconnection between the battery and the device. The actual effects are as follows:

[0057] (1) Good thickness consistency

[0058] Twenty square lithium-ion batteries were subjected to a 0.2C capacity test according to the system in Table 1. The thickness of the batteries was measured before and after the test, and the thickness difference was calculated. It was found that the maximum difference was 0.15 mm, the minimum was 0.10 mm, and the average was 0.12 mm, indicating that the device can effectively ensure the thickness consistency after the test.

[0059] (2) Good temperature consistency

[0060] In an environment of 20 ± 3°C, twenty square lithium-ion batteries were subjected to a 0.2C capacity test according to the system in Table 1. The maximum difference in the self-temperature of each monomer during the test was 1.5°C, and the maximum difference in temperature between each monomer was also 1.5°C, indicating that the device can effectively improve the temperature uniformity of the battery test.

[0061] (3) Good line impedance consistency

[0062] One square lithium-ion battery was subjected to a direct current internal resistance test once on 20 channels according to the system in Table 2. The 20 test results were compared, and it was found that the range was 0.03 mΩ, indicating that the device can effectively ensure the line impedance consistency of the test.

[0063] Therefore, the present invention has the value of popularization.

[0064] The test systems for the battery 20 are shown in Table 1 and Table 2.

[0065] Table 1 0.2C Capacity Test System

[0066]

[0067]

[0068] Table 2 Direct Current Internal Resistance Test System

[0069]

[0070] As described above, it is only the best specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention.

[0071] The content not described in detail in the specification of the present invention belongs to the well-known technology of those skilled in the art.

Claims

1. A clamping device for battery testing, characterized in that: The invention comprises a battery slot assembly (1), a base (2), a first universal clamping plate (3), a pull rod (4), a second universal clamping plate (8), a third universal clamping plate (10), a pressure screw (13), a test terminal (21), a partition plate (22), a fourth universal clamping plate (24), a second partition plate (25) and an electrode holder (30), wherein the battery slot assembly (1) is used to fix the battery (20), a plurality of battery slot assemblies (1) are separated by the fourth universal clamping plate (24), the end portions are respectively the first universal clamping plate (3) and the second universal clamping plate (8), the side walls are respectively the partition plate (22) and the second partition plate (25), and the bottom The bottom is a base (2), and the top is an electrode seat (30), forming a box-shaped structure; the base (2) is connected to the first universal clamping plate (3) through a pull rod (4), and the pull rod (4) passes through the clamping device to provide a tensioning force; the second universal clamping plate (8) is provided with a pressure screw (13) for applying a pressure force to clamp the battery (20); the third universal clamping plate (10) is provided with a through hole, and the pull rod (4) and the pressure screw (13) pass through the through hole, which is used to limit the pull rod (4) and the pressure screw (13); the electrode seat (30) is provided with a test terminal (21) for connecting the test equipment and the battery (20) pole.

2. The clamping device for battery testing according to claim 1, wherein: It also comprises a connecting piece (6) and a bushing (7), wherein the two ends of the connecting piece (6) are respectively connected to adjacent clamping plates, a plurality of bushings (7) are arranged on the connecting piece (6), and the connecting piece (6) is connected to the first universal clamping plate (3), the second universal clamping plate (8), and the fourth universal clamping plate (24) via the bushings (7).

3. The clamping device for battery testing according to claim 1, characterized in that: It also includes a bearing flange (9) and a flange (11). The bearing flange (9) is arranged on the second universal clamping plate (8) and is connected to the pressure screw (13) to cooperate with the pressure screw (13) to apply a clamping force. The flange (11) is arranged on the third universal clamping plate (10) to limit the pressure screw (13).

4. A clamping device for battery testing according to claim 3, characterized in that: The bearing flange (9) is provided with a one-way thrust ball bearing (15) for cooperating with the pressure screw (13) to apply a clamping force.

5. The clamping device for battery testing according to claim 1, characterized in that: It also comprises a nut (16), a washer (17) and a spring washer (18), wherein the nut (16), the washer (17) and the spring washer (18) are arranged on the third universal clamping plate (10) and are used to fix the pull rod (4).

6. The clamping device for battery testing according to claim 1, characterized in that: It also includes a battery pad (23), which is arranged below the battery (20) and is used to adjust the height of the battery and fix it so that the battery pole can contact the test terminal (21) without displacement.

7. The clamping device for battery testing according to claim 6, characterized in that: It also includes a threaded steel sleeve (39), which is arranged at the center of the battery cushion block (23) to facilitate the removal and placement of the battery cushion block (23).

8. The clamping device for battery testing according to claim 1, characterized in that: It also includes a spring (26), which is arranged on the partition (22) and the second partition (25) and is used to open the fourth universal clamping plate (24) when the pressure screw (13) is loosened, so as to facilitate the removal of the battery (20).

9. The clamping device for battery testing according to claim 1, characterized in that: It further includes a latch rod (27), an electrode base insulator (33) and a latch (34). The test terminal (21) is a push-down latch type test terminal. The latch rod (27) and the latch (34) are arranged on the second partition plate (25), and the electrode base insulator (33) is arranged on the electrode base (30). When the test terminal (21) is pushed down, the latch rod (27) and the latch (34) latch onto the electrode base insulator (33) to achieve close contact between the test terminal (21) and the battery terminal during the test process.

10. The clamping device for battery testing according to claim 1, characterized in that: It further includes a pin (28) and a hinge (29). The pin (28) and the hinge (29) are arranged on the partition plate (22) and are used to achieve contact and separation between the test terminal (21) and the battery terminal.

11. A clamping device for battery testing according to claim 1, characterized in that: It further includes an electrode travel spacer (31) and a crimping terminal (32). The electrode travel spacer (31) is arranged on the electrode base (30), and the test terminal (21) is connected to the test cable through the crimping terminal (32).

12. The clamping device for battery testing according to claim 1, characterized in that: The fourth general clamping plate (24) is a metal plate, and a plurality of through holes are arranged on the upper surface of the fourth general clamping plate (24) to increase heat convection.

13. A battery testing method based on the clamping device described in claims 1-12, characterized in that: It includes the following steps: (1) Remove the battery terminal protection cap and place the battery (20) into the battery slot assembly (1) according to the polarity. (2) Rotate the pressure screw (13) until the set torque is reached. (3) Push down the electrode base (30) to make the spring end of the test terminal (21) closely contact the battery terminal; (4) Perform electrical performance tests according to the predetermined test procedure. (5) After the test program runs to completion, separate the spring end of the test terminal (21) from the battery terminal. (6) Take out the battery (20) from the battery slot assembly (1), install the battery terminal protection cap, and complete the test.

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