A lithium battery insulation testing device
By using staggered insulating plates and puncture components, combined with the linkage of screws and guide blocks, independent testing of the aluminum layer of lithium batteries is achieved. This solves the problem that existing devices cannot distinguish aluminum layers, reduces equipment costs and error rates, and improves testing accuracy and product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUILIN UNIV OF AEROSPACE TECH
- Filing Date
- 2025-06-23
- Publication Date
- 2026-07-03
AI Technical Summary
Existing lithium battery insulation testing devices cannot clearly distinguish between the first and second aluminum layers when testing the insulation resistance of the aluminum layer in lithium batteries, making it impossible to make targeted adjustments. Furthermore, the equipment is complex and costly.
The device employs staggered upper and lower insulating plates and piercing components, and precisely adjusts the piercing depth through a screw and guide block linkage mechanism to ensure that a single aluminum layer is pierced individually. A single drive unit controls the movement of the insulating plates, reducing mechanical complexity and cost.
Independent testing of the aluminum layer of lithium batteries has been achieved, which improves the accuracy of test results, reduces equipment manufacturing costs and maintenance difficulty, reduces misjudgment rate and rework rate, and improves product quality.
Smart Images
Figure CN224456984U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery testing technology, specifically to a lithium battery insulation testing device. Background Technology
[0002] The insulation resistance test of a soft-pack lithium-ion battery actually tests whether there is conductivity between the negative electrode tab and the aluminum layer inside the aluminum-plastic film. Currently, insulation testing mechanisms use a fixed voltage and time setting. One end of the test clamp is connected to the conductive handle of the electrode tab, and the other end pierces the double aluminum layers of the aluminum-plastic film. Based on the conductivity of the aluminum layers, a connection circuit is formed. The resistance value is measured under the set fixed voltage and time, and the product's insulation test requirements are determined according to resistance standards. However, the parallel resistance values of the two aluminum layers can interfere with each other, and the location of insulation failure is not clearly correlated. Once the insulation test fails, existing testing methods cannot determine whether the problem lies with the first or second aluminum layer, or whether both layers are faulty, making targeted process analysis and adjustments impossible.
[0003] To address the aforementioned technical problems, patent document CN216083037U discloses a lithium battery insulation testing device, comprising a base and several testing mechanisms. These testing mechanisms are spaced apart on the base. One testing mechanism can independently test the insulation resistance of a portion of the aluminum layer of a lithium battery, while two testing mechanisms can simultaneously and independently test the insulation resistance of two portions of the aluminum layer of a single lithium battery. This lithium battery insulation testing device can simultaneously test the insulation resistance of multiple lithium batteries, making it functionally diverse and highly practical and versatile. The lithium battery is clamped by a clamping assembly of the testing mechanisms. After clamping, a blade on one testing mechanism moves along the Z-axis to pierce a single layer of aluminum film on one side of the lithium battery, while a blade on another testing mechanism pierces a single layer of aluminum film on the other side. This achieves simultaneous testing of both portions of the aluminum layer of the lithium battery while avoiding mutual interference between the aluminum layers. When performing insulation tests on lithium batteries, two testing mechanisms are equipped with a first driving component and a second driving component, respectively. The first driving component and the second driving component drive the first clamping plate and the second clamping plate to move closer to each other and clamp the lithium battery. The structure of this device is relatively complex, with a large number of driving components and high equipment manufacturing costs. Utility Model Content
[0004] The main purpose of this invention is to provide a lithium battery insulation testing device with low equipment investment cost and the ability to pre-clamp the battery stably before puncturing it.
[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:
[0006] A lithium battery insulation testing device includes a vertical plate with two insulating plates at its front end. The two insulating plates are positioned vertically, with the lower insulating plate fixedly connected to the vertical plate and the upper insulating plate sliding vertically. The upper insulating plate is connected to the upper end of the vertical plate via a drive unit. A piercing assembly and a support block are respectively provided on the left and right sides of the opposite end faces of the two insulating plates, with the piercing assembly and support block on the upper and lower sides staggered. A clamping plate is elastically connected to the insulating plate between the piercing assembly and the support block. The piercing assembly includes an insulating block with two vertical grooves and a horizontal groove communicating with the vertical grooves. A piercing blade is elastically slidably connected to the vertical groove. One end of the bayonet extends to the outside of the insulating block. Two guide blocks are slidably installed in the transverse groove. The two bayonets correspond one-to-one with the two guide blocks. The bayonet has a slot. The groove wall near the lithium battery being tested is a guide slope. The guide slope of the guide block fits with the guide slope. The two guide blocks are fixedly connected by a connecting rod. One of the guide blocks is rotatably connected to one end of the screw. The other end of the screw extends to the outside of the insulating block. The length direction of the transverse groove is parallel to the axial direction of the screw. A conductive post is fixed on the insulating block. The conductive post penetrates the insulating plate on one side. The conductive post is electrically connected to the bayonet through a wire. The wire part is located in the vertical groove. The wire part in the vertical groove is in a bent state.
[0007] Specifically, a slider is fixed to the rear end of the upper insulating plate, and a vertical groove is opened at the front end of the upright plate, in which the slider is slidably engaged.
[0008] Specifically, the drive unit includes two telescopic rods, the lower end of which is fixedly connected to the upper insulating plate, and a top plate is fixedly attached to the upper end of the upright plate, with the upper end of the telescopic rods fixedly connected to the top plate.
[0009] Specifically, the clamping plate is connected to the insulating plate on one side by a spring.
[0010] Specifically, one end of the bayonet inside the insulating block is connected to the bottom of the vertical groove via a tension spring.
[0011] Specifically, a handwheel is concentrically fixed to one end of the screw on the outside of the insulating block.
[0012] Specifically, the bayonet on the outside of the insulating block has a pointed end.
[0013] Specifically, a mounting plate is fixed to the lower end of the upright plate.
[0014] Specifically, a light rod is fixed to the side of the clamp away from the lithium battery being tested. The light rod is vertically set and slidably connected to an insulating plate on one side of the light rod.
[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0016] 1. Through the staggered piercing components and support blocks arranged on the upper and lower insulating plates, combined with the adjustable piercing structure, it can simultaneously pierce the single-layer aluminum film on both the upper and lower surfaces of the lithium battery, enabling independent testing of the two aluminum layers. The piercing depth is precisely adjusted through a screw and guide block linkage mechanism to ensure that only a single aluminum layer is pierced, thus physically isolating the conductive interference between the two aluminum layers and significantly improving the positioning accuracy of the test results.
[0017] 2. The clamping plate, spring, and sliding limit structure apply a progressive clamping force to the lithium battery before puncture through the relative movement of the two insulating plates. During clamping, the lithium battery is first pre-fixed by the clamping plate. As the insulating plates continue to move, the clamping plate gradually compresses the spring to adapt to the battery thickness, which avoids battery displacement and prevents overvoltage damage, ensuring the stability and safety of the test.
[0018] 3. A single drive unit controls the movement of the upper insulating plate, replacing the traditional multi-drive design and reducing mechanical complexity; the bayonet adjustment mechanism achieves precise manual control via handwheel and screw, reducing electrical automation costs. The overall device significantly reduces manufacturing costs and maintenance difficulty while ensuring functionality.
[0019] 4. The bayonet and the conductive post are connected by redundant bent wires. When the bayonet extends or retracts, the wires extend freely in the vertical groove without being broken. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the device.
[0021] Figure 2 This is a front view of the device.
[0022] Figure 3 for Figure 2 A magnified view of region A in the middle.
[0023] The components in the attached diagram are named as follows: 1. Vertical plate, 2. Mounting plate, 3. Top plate, 4. Insulating plate, 5. Telescopic rod, 6. Slide groove, 7. Slider, 8. Clamping plate, 9. Spring, 10. Conductive column, 11. Bayonet, 12. Insulating block, 13. Vertical groove, 14. Tension spring, 15. Slot, 16. Guide slope, 17. Horizontal groove, 18. Guide block, 19. Connecting rod, 20. Support block, 21. Screw, 22. Handwheel, 23. Wire, 24. Smooth rod. Detailed Implementation
[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.
[0025] Example 1: Refer to Figures 1-3As shown, a lithium battery insulation testing device includes a vertical plate 1, with a mounting plate 2 fixed to the lower end of the vertical plate 1. Two insulating plates 4 are provided at the front end of the vertical plate 1, arranged vertically. The lower insulating plate 4 is fixedly connected to the vertical plate 1, while the upper insulating plate 4 can slide in the vertical direction of the vertical plate 1.
[0026] A slider 7 is fixed to the rear end of the upper insulating plate 4, and a vertical groove 6 is opened at the front end of the upright plate 1. The slider 7 is slidably engaged in the groove 6. The upper insulating plate 4 can move up and down, and the upper and lower insulating plates 4 can move away from or closer to each other.
[0027] The upper insulating plate 4 is connected to the upper end of the upright plate 1 via a drive unit. The drive unit includes two telescopic rods 5, the lower end of which is fixedly connected to the upper insulating plate 4. A top plate 3 is fixedly attached to the upper end of the upright plate 1, and the upper end of the telescopic rods 5 is fixedly connected to the top plate 3.
[0028] Simultaneously activating the two telescopic rods 5 allows the upper insulating plate 4 to move vertically.
[0029] The left and right sides of the opposite end faces of the two insulating plates 4 are respectively provided with piercing components and support blocks 20, and the piercing components and support blocks 20 on the upper and lower sides are staggered.
[0030] In this embodiment, a piercing assembly is fixed to the lower left side of the upper insulating plate 4, and a support block 20 is fixed to the lower right side of the upper insulating plate 4. A support block 20 is fixed to the upper left side of the lower insulating plate 4, and a piercing assembly is fixed to the upper right side of the lower insulating plate 4.
[0031] A clamping plate 8 is elastically connected to the insulating plate 4 between the puncture assembly and the support block 20, and the clamping plate 8 is connected to the insulating plate 4 on one side of it by a spring 9.
[0032] When the upper insulating plate 4 descends to clamp the lithium battery, the two clamping plates 8 pre-clamp the lithium battery. After the two clamping plates 8 clamp the lithium battery, as the upper insulating plate 4 continues to descend, the clamping plates 8 gradually move closer to the insulating plate 4 on one side, and the spring 9 is compressed. After the two clamping plates 8 clamp the lithium battery, the lithium battery can be positioned.
[0033] The piercing assembly includes an insulating block 12 with two vertical slots 13 and a horizontal slot 17 communicating with the vertical slots 13. A bayonet 11 is elastically slidably connected to the vertical slots 13. Specifically, one end of the bayonet 11 inside the insulating block 12 is connected to the bottom of the vertical slot 13 via a tension spring 14. One end of the bayonet 11 extends to the outside of the insulating block 12, and the end of the bayonet 11 on the outside of the insulating block 12 is a pointed tip.
[0034] Two guide blocks 18 are slidably arranged in the transverse groove 17. Two bayonets 11 correspond one-to-one with the two guide blocks 18. A slot 15 is opened on the bayonet 11. The groove 15 is close to the groove wall of the lithium battery being tested and is a guide slope 16. The guide slope of the guide block 18 is in contact with the guide slope 16. The two guide blocks 18 are fixedly connected by a connecting rod 19. One of the guide blocks 18 is rotatably connected to one end of the screw 21. The other end of the screw 21 extends to the outside of the insulating block 12. A handwheel 22 is concentrically fixed to one end of the screw 21 outside the insulating block 12. The length direction of the transverse groove 17 is parallel to the axial direction of the screw 21.
[0035] Rotating the screw 21 allows the two guide blocks 18 to move synchronously within the transverse groove 17. Under the action of the guide slope and the guide inclined surface 16, the bayonet 11 in the vertical groove 13 can move outward toward the insulating block 12, thereby adjusting the length of the bayonet 11 on the outside of the insulating block 12 and controlling the depth of the bayonet 11 into the lithium battery.
[0036] A conductive post 10 is fixed on the insulating block 12. The conductive post 10 passes through the insulating plate 4 on one side. The conductive post 10 is electrically connected to the bayonet 11 through the wire 23. The wire 23 is located in the vertical groove 13. The wire 23 in the vertical groove 13 is in a bent state.
[0037] During the insulation test of the lithium battery, the lithium battery is placed between two clamping plates 8, and two telescopic rods 5 are activated simultaneously. These rods drive the upper insulating plate 4, the upper support block 20, and the upper piercing assembly downwards. The two clamping plates 8 pre-clamp the lithium battery. After clamping, as the upper insulating plate 4 continues to descend, the spring 9 is compressed. When the insulating block 12 and support block 20 clamp the lithium battery, the upper piercing 11 pierces the upper single-layer aluminum film of the lithium battery, and the lower piercing 11 pierces the lower single-layer aluminum film. This connects one end of the insulation tester to the conductive post 10, and the other end to the negative electrode tab of the lithium battery. The resistance value is measured at a set fixed voltage and time, and the product's insulation test requirement is determined based on the resistance standard.
[0038] This embodiment can simultaneously and independently measure the insulation resistance of the two aluminum layers and the conductive handle of the negative electrode tab of the same lithium battery, and avoids mutual interference between the aluminum layers, ensuring the accuracy of the final test structure, reducing the misjudgment rate and rework rate, improving product quality, and reducing inspection costs.
[0039] The length of the bayonet 11 on the outer side of the insulating block 12 can be adjusted according to different lithium batteries. Rotating the screw 21 allows the two guide blocks 18 to move synchronously within the transverse groove 17. Under the action of the guide slope and guide incline 16, the bayonet 11 in the vertical groove 13 can move outwards from the insulating block 12, allowing for the adjustment of the length of the bayonet 11 on the outer side of the insulating block 12. When the bayonet 11 in the vertical groove 13 moves outwards from the insulating block 12, the tension spring 14 is stretched.
[0040] When it is necessary to reduce the length of the bayonet 11 portion on the outer side of the insulating block 12, the rotation direction of the screw 21 is changed, thereby changing the movement direction of the guide block 18 within the transverse groove 17. As the guide block 18 moves within the transverse groove 17, under the tension of the tension spring 14, the bayonet 11 can gradually move into the vertical groove 13. By changing the length of the bayonet 11 portion on the outer side of the insulating block 12, it is ensured that the bayonet 11 only pierces the single-layer aluminum layer of the lithium battery and does not pierce the double-layer aluminum layer of the lithium battery.
[0041] Example 2: Based on Example 1, referring to... Figure 2 As shown, a light rod 24 is fixed to the side of the clamping plate 8 away from the lithium battery being tested. The light rod 24 is set vertically and is slidably connected to the insulating plate 4 on one side of it.
[0042] After the clamping plate 8 clamps the lithium battery, the sliding connection between the light rod 24 and the insulating plate 4 on one side can limit the sliding direction of the clamping plate 8, thereby ensuring the stability of the lithium battery after the clamping plate 8 clamps the lithium battery.
[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A lithium battery insulation testing device, comprising a vertical plate (1), with two insulating plates (4) disposed at the front end of the vertical plate (1), the two insulating plates (4) being disposed vertically, the lower insulating plate (4) being fixedly connected to the vertical plate (1), and the upper insulating plate (4) being able to slide in the vertical direction of the vertical plate (1), the upper insulating plate (4) being connected to the upper end of the vertical plate (1) via a driving unit, characterized in that, Two insulating plates (4) are provided with piercing components and support blocks (20) on their opposite ends. The piercing components and support blocks (20) on the upper and lower sides are staggered. A clamping plate (8) is elastically connected to the insulating plate (4) between the piercing components and support blocks (20). The piercing component includes an insulating block (12). Two vertical grooves (13) are opened on the insulating block (12). A horizontal groove (17) is opened on the insulating block (12). The horizontal groove (17) is connected to the vertical groove (13). A bayonet (11) is elastically slidably connected to the vertical groove (13). One end of the bayonet (11) extends to the outside of the insulating block (12). Two guide blocks (18) are slidably arranged in the horizontal groove (17). The two bayonets (11) correspond one-to-one with the two guide blocks (18). A slot is opened on the bayonet (11). 15), the groove (15) is close to the wall of the lithium battery being tested as a guide slope (16), the guide slope of the guide block (18) is in contact with the guide slope (16), the two guide blocks (18) are fixedly connected by the connecting rod (19), one of the guide blocks (18) is rotatably connected to one end of the screw (21), the other end of the screw (21) extends to the outside of the insulating block (12), the length direction of the transverse groove (17) is parallel to the axial direction of the screw (21); a conductive post (10) is fixed on the insulating block (12), the conductive post (10) penetrates the insulating plate (4) on one side, the conductive post (10) is electrically connected to the bayonet (11) through the wire (23), part of the wire (23) is located in the vertical groove (13), the part of the wire (23) in the vertical groove (13) is in a bent state.
2. The lithium battery insulation testing device of claim 1, wherein, The upper insulating plate (4) has a slider (7) fixed at its rear end, and the front end of the upright plate (1) has a vertical groove (6) with the slider (7) slidingly engaged in the groove (6).
3. The lithium battery insulation testing device of claim 1, wherein, The drive unit includes two telescopic rods (5), the lower end of which is fixedly connected to the upper insulating plate (4), and the upper end of the upright plate (1) is fixedly connected to the top plate (3). The upper end of the telescopic rod (5) is fixedly connected to the top plate (3).
4. The lithium battery insulation testing device of claim 1, wherein, The clamp (8) is connected to the insulating plate (4) on one side by a spring (9).
5. The lithium battery insulation testing device of claim 1, wherein, One end of the bayonet (11) inside the insulating block (12) is connected to the bottom of the vertical groove (13) by a tension spring (14).
6. The lithium battery insulation testing device of claim 1, wherein, A handwheel (22) is concentrically fixed at one end of the screw (21) on the outside of the insulating block (12).
7. The lithium battery insulation testing device of claim 1, wherein, The bayonet (11) on the outside of the insulating block (12) has a pointed end.
8. The lithium battery insulation testing device of claim 1, wherein, The lower end of the upright plate (1) is fixed with an mounting plate (2).
9. The lithium battery insulation testing device of claim 1, wherein, The clamp (8) has a light rod (24) fixed on the side away from the lithium battery being tested. The light rod (24) is set vertically and is slidably connected to the insulating plate (4) on one side.