Battery cell aluminum plastic film insulation test structure

Abstract

The utility model discloses a battery core aluminum plastic film insulation test structure, which comprises a battery core and a direct current power supply device, the direct current power supply device is provided with a first conductive part and a second conductive part, the battery core comprises a positive electrode and a negative electrode, the direct current power supply device comprises a probe part, one end of the probe part is connected with the first conductive part, and the other end of the probe part is connected with the second conductive part. The other end of the probe part is used for piercing the sealing edge of the aluminum plastic film of the battery cell, the second conductive part is electrically connected with the negative electrode of the electrode, and the position where the probe part pierces the aluminum plastic film of the battery cell is located at the air bag sealing position of the battery cell or the unsealed area outside the aluminum plastic film above the battery cell. According to the utility model, by adjusting the piercing position of the probe part, piercing operation is carried out on the aluminum plastic film above the battery cell, so that the conditions of air bag piercing leakage and no piercing hole detection caused by battery position fluctuation are avoided, and a fire hazard caused by the fact that defective products flow into formation is avoided.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery production technology, and in particular to a battery cell aluminum-plastic film insulation test structure. Background Technology

[0002] Aluminum-plastic film is the packaging material for soft-pack batteries. Due to its advantages such as light weight, thin layer, and flexible design, it has been widely used in many fields such as 3C consumer electronics, power batteries, and energy storage. Because the aluminum layer in the middle of the aluminum-plastic film is prone to short-circuiting with the negative electrode tab during battery packaging, causing corrosion of the aluminum layer after the battery cell is charged, an insulation testing process for the aluminum-plastic film needs to be added to the production process of soft-pack lithium batteries.

[0003] Current insulation testing methods utilize an insulation resistance tester where one end contacts the negative terminal of the lithium battery, and a probe at the other end pierces the aluminum layer of the aluminum-plastic film. The lithium battery is then powered on by the insulation resistance tester for testing. However, when piercing the aluminum-plastic film with the probe, the piercing point is usually in the sealed area of ​​the aluminum-plastic film on the side of the negative terminal of the cell or in the unsealed area on the outside. When the cell is not positioned correctly, the probe may fail to pierce the aluminum-plastic film, resulting in missed detection, or the probe may pierce the air bag too deeply. Both of these situations cannot be completely detected in subsequent quality inspections, leading to a high risk of defective lithium batteries entering the formation process and potentially causing a fire. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a battery cell aluminum-plastic film insulation test structure.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A battery cell aluminum-plastic film insulation testing structure includes: a battery cell and a DC power supply device. The DC power supply device is provided with a first conductive part and a second conductive part. The battery cell includes a positive electrode and a negative electrode. The DC power supply device includes a probe part. One end of the probe part is connected to the first conductive part, and the other end of the probe part is used to pierce the sealing edge of the battery cell aluminum-plastic film. The second conductive part is electrically connected to the negative electrode of the battery cell. The position where the probe part pierces the battery cell aluminum-plastic film is located at the air bag seal of the battery cell or the unsealed area outside the aluminum-plastic film above the battery cell.

[0007] In one embodiment, the probe portion includes a positive electrode connection wire and a probe, one end of the positive electrode connection wire is connected to the first conductive portion, the other end of the positive electrode connection wire is connected to the probe, and the probe is located directly above the battery cell.

[0008] In one embodiment, the probe has a sharp end near the aluminum-plastic film of the battery cell for easy piercing of the aluminum-plastic film.

[0009] In one of the embodiments, a negative electrode connecting wire is arranged between the second conductive part and the negative electrode of the battery cell, one end of the negative electrode connecting wire is connected with the second conductive part, and the other end of the negative electrode connecting wire is connected with the negative electrode of the battery cell.

[0010] In one of the embodiments, the direct current power supply device is a voltage-adjustable direct current power supply device, and the adjustable power supply range of the direct current power supply device is 400-800V.

[0011] In one of the embodiments, a pressing assembly for fixing the battery cell so as to ensure normal insulation test is arranged on the battery cell, the pressing assembly comprises a workbench, a fixing seat and a driving member, the battery cell is placed on the workbench, the fixing seat is arranged on the workbench, the upper end of the fixing seat is located directly above the battery cell, a pressing block is arranged on the side of the upper end of the fixing seat facing the battery cell, the driving member is fixed at the upper end of the fixing seat, and the output shaft of the driving member is fixedly connected with the pressing block downward.

[0012] In one of the embodiments, the probe is fixed on the pressing block, the probe is arranged in the pressing block, and the sharp part of the probe extends out of the pressing block by a certain distance.

[0013] In one of the embodiments, a sliding assembly for adjusting the position of the probe is arranged on the pressing block, the sliding assembly comprises a sliding groove arranged on the pressing block and a sliding block slidingly arranged in the sliding groove, the sliding groove is arranged along the length direction of the pressing block, the sliding block can slide along the length direction of the sliding groove, the probe is vertically arranged in the sliding block, and the sharp part of the probe extends out of the sliding block and is arranged towards the battery cell below.

[0014] In one of the embodiments, the length of the sharp part of the probe extending out of the lower surface of the pressing block is the depth of the probe piercing the aluminum plastic film of the battery cell.

[0015] In one of the embodiments, an insulating plate is arranged on the workbench, and the pressing block and the sliding block are made of insulating materials.

[0016] Compared with the prior art, the utility model has at least the following advantages:

[0017] The probe part piercing position of the battery cell aluminum plastic film insulation test structure is adjusted, the aluminum plastic film is pierced above the battery cell, the leakage of the gas bag caused by the battery position fluctuation is avoided, the situation of no piercing hole detection is avoided, and the fire caused by the flow of defective products into the formation is avoided. The fixing assembly for fixing the battery cell is arranged, the insulation test is facilitated, the size and position of the probe piercing the aluminum plastic film are consistent, and the consistency of the insulation test result of the aluminum plastic film is improved. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below.

[0019] Figure 1 A schematic diagram of a battery cell aluminum-plastic film insulation test structure provided by this utility model;

[0020] Figure 2 This is a schematic diagram of the clamping block pressing the battery cell in a battery cell aluminum-plastic film insulation test structure provided by this utility model.

[0021] Figure descriptions: 10. Battery cell; 11. Positive electrode; 12. Negative electrode; 20. DC power supply device; 21. First conductive part; 22. Second conductive part; 23. Probe part; 231. Positive electrode connecting wire; 232. Probe; 2321. Sharp part; 24. Negative electrode connecting wire; 30. Clamping assembly; 31. Worktable; 32. Fixing base; 33. Driving component; 34. Clamping block; 341. Slide groove; 342. Slider; 40. Insulating plate. Detailed Implementation

[0022] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be given below with reference to the accompanying drawings.

[0023] A battery cell aluminum-plastic film insulation test structure, referring to Figure 1 The device includes a battery cell 10 and a DC power supply device 20. The DC power supply device 20 is provided with a first conductive part 21 and a second conductive part 22. The battery cell 10 includes a positive electrode 11 and a negative electrode 12. The DC power supply device 20 includes a probe part 23. One end of the probe part 23 is connected to the first conductive part 21, and the other end of the probe part 23 is used to pierce the sealing edge of the aluminum-plastic film of the battery cell 10. The second conductive part 22 is electrically connected to the negative electrode 12 of the battery cell 10. It should be noted that the DC power supply device 20 is used to perform insulation testing on the aluminum-plastic film of the battery cell 10. After the DC power supply device 20 is connected to the battery cell 10, it is energized. The DC power supply device 20 outputs a specified power to the battery cell 10. If leakage, breakdown, or smoke occurs at the sealing edge of the soft-pack lithium-ion battery, it indicates that the insulation of the aluminum-plastic film at the location of leakage, breakdown, or smoke is poor. If no leakage, breakdown, or smoke occurs at the sealing edge of the soft-pack lithium-ion battery, it indicates that the insulation of the aluminum-plastic film at the sealing edge of the soft-pack lithium-ion battery is good.

[0024] Reference Figure 1, the position where the probe portion 23 pierces the aluminum plastic film of the battery cell 10 is located at the air bag seal of the battery cell 10 or the unsealed area of the aluminum plastic film above the battery cell 10. By adjusting the position where the probe portion 23 pierces, the piercing operation of the aluminum plastic film above the battery cell 10 is performed to eliminate the leakage of the air bag caused by the battery position fluctuation, the no-piercing detection, and the fire caused by the flow of defective products into the formation.

[0025] Referring to Figure 1 , the probe portion 23 includes a positive electrode connecting wire 231 and a probe 232, one end of the positive electrode connecting wire 231 is connected with the first conductive portion 21 of the direct current power supply device 20, the other end of the positive electrode connecting wire 231 is connected with the probe 232, and the probe 232 is located directly above the battery cell 10 to pierce the aluminum plastic film of the battery cell 10.

[0026] Further, referring to Figure 1 , one end of the probe 232 close to the aluminum plastic film of the battery cell 10 is provided with a sharp portion 2321 for facilitating the piercing of the aluminum plastic film, and the sharp portion 2321 can pierce the aluminum plastic film of the battery cell 10 downward to realize the connection between the battery cell 10 and the direct current power supply device 20 for detection.

[0027] Further, referring to Figure 1 , the sharp portion 2321 is conical, and the conical angle of the sharp portion 2321 is 20°-80°.

[0028] Further, referring to Figure 1 , the second conductive portion 22 of the direct current power supply device 20 and the negative electrode 12 of the battery cell 10 are provided with a negative electrode connecting wire 24, one end of the negative electrode connecting wire 24 is connected with the second conductive portion 22, and the other end of the negative electrode connecting wire 24 is connected with the negative electrode 12 of the battery cell 10. By electrically connecting the first conductive portion 21 and the second conductive portion 22 of the direct current power supply device 20 with the aluminum plastic film and the negative electrode 12 of the battery cell 10 respectively, whether the aluminum plastic film and the negative electrode 12 of the battery cell 10 are short-circuited can be detected when the direct current power supply device 20 is powered.

[0029] Further, referring to Figure 1 , the direct current power supply device 20 is an adjustable voltage direct current power supply device 20, and the adjustable power range of the direct current power supply device 20 is 400-800V.

[0030] Further, referring to Figure 1 and Figure 2The pressing assembly 30 is arranged at the battery cell 10 to fix the battery cell 10 so that the insulation test is normally performed, and the pressing assembly 30 comprises a workbench 31, a fixing seat 32 and a driving member 33. The battery cell 10 is placed on the workbench 31, and the fixing seat 32 is arranged on the workbench 31. The fixing seat 32 is arranged in an inverted L shape, and the upper end of the fixing seat 32 is located directly above the battery cell 10. The side of the upper end of the fixing seat 32, which faces the battery cell 10, is provided with a pressing block 34 for pressing the battery cell 10. The pressing block 34 can move downward until abutting against the upper surface of the battery cell 10. The driving member 33 is fixed to the upper end of the fixing seat 32, and the output shaft of the driving member 33 is fixedly connected with the pressing block 34 downward. It should be noted that the driving member 33 is a pneumatic cylinder, and the piston rod of the pneumatic cylinder is fixedly connected with the pressing block 34 downward. The pneumatic cylinder can control the pressing block 34 to move downward until abutting against the upper surface of the battery cell 10, so as to fix the position of the battery cell 10, press the aluminum plastic film in the battery cell 10 flat, facilitate subsequent insulation test, ensure that the size and position of the probe 232 piercing the aluminum plastic film are consistent, and help to improve the consistency of the insulation test result of the aluminum plastic film.

[0031] Further, referring to Figure 1 and Figure 2 , the probe 232 at one end of the positive electrode connecting wire 231 is fixed to the pressing block 34, the probe 232 is arranged in the pressing block 34, and the sharp part 2321 of the probe 232 extends out of the pressing block 34 by a certain distance.

[0032] Further, referring to Figure 1 and Figure 2 , the pressing block 34 is provided with a sliding assembly for adjusting the position of the probe 232. The sliding assembly comprises a sliding groove 341 arranged on the pressing block 34 and a sliding block 342 slidingly arranged in the sliding groove 341. The sliding groove 341 is arranged along the length direction of the pressing block 34, and the sliding block 342 can slide along the length direction of the sliding groove 341. The probe 232 is vertically arranged in the sliding block 342, and the probe 232 is fixedly connected with the sliding block 342. The sharp part 2321 of the probe 232 extends out of the sliding block 342 and is arranged towards the battery cell 10 below. It should be noted that the probe 232 can slide along the length direction of the sliding groove 341 to adjust the position of the probe 232 and adjust the position of piercing the aluminum plastic film of the battery cell 10. The sliding block 342 can be fixed in the sliding groove 341 by bolts or pins, so as to avoid displacement of the probe 232 after adjusting the position of the probe 232.

[0033] Further, referring to Figure 1 and Figure 2, the length of the sharp part 2321 of the probe 232 penetrating out of the lower surface of the pressing block 34 is the depth of the probe 232 penetrating the aluminum plastic film. When the battery cell 10 is placed on the workbench 31, the air cylinder controls the pressing block 34 to descend to press the aluminum plastic film of the battery cell 10 flat, and at the same time when the pressing block 34 contacts the battery cell 10, the sharp part 2321 of the probe 232 penetrates the aluminum plastic film of the battery cell 10 downward. By fixing the probe 232 on the pressing block 34, the depth of the probe 232 penetrating the aluminum plastic film is consistent every time, so that the phenomenon that the probe 232 does not penetrate the aluminum plastic film to cause missed detection or causes the probe 232 to penetrate too deeply to pierce the gas bag is avoided.

[0034] Further, referring to Figure 1 and Figure 2 , the workbench 31 is provided with an insulating plate 40, and the pressing block 34 and the sliding block 342 are made of insulating materials. By arranging the insulating plate 40, the insulation of the direct current power supply device 20 is improved, and the interference on the insulation test result of the aluminum plastic film is reduced.

[0035] The utility model discloses the position of the probe part 23 is adjusted to penetrate the aluminum plastic film above the battery cell 10 to prevent the battery position fluctuation from causing the gas bag to be pierced and leak, and the no-piercing detection condition, and avoid the defective product from flowing into the fire caused by the formation. By arranging the fixing assembly for fixing the battery cell 10, the insulation test is facilitated, the size and position of the probe 232 piercing the aluminum plastic film are consistent, and the consistency of the insulation test result of the aluminum plastic film is improved.

[0036] The above-mentioned embodiments only express several implementation manners of the utility model, and the description is more specific and detailed, but can not be understood as the limitation of the utility model patent scope. It should be pointed out that for ordinary skilled person in the art, without departing from the utility model concept, a plurality of deformations and improvements can be made, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be according to the appended claims.

Claims

1. A battery cell aluminum-plastic film insulation test structure, characterized in that, The application relates to a direct-current power supply device and a battery cell. The direct-current power supply device (20) is provided with a first conductive part (21) and a second conductive part (22), the battery cell (10) comprises a positive electrode (11) and a negative electrode (12), the direct-current power supply device (20) comprises a probe part (23), one end of the probe part (23) is connected with the first conductive part (21), the other end of the probe part (23) is used for piercing the sealing edge of an aluminum plastic film of the battery cell (10), the second conductive part (22) is electrically connected with the negative electrode (12) of the battery cell (10), and the position, at which the probe part (23) pierces the aluminum plastic film of the battery cell (10), is located at a gas bag sealing position of the battery cell (10) or an unsealed area of the aluminum plastic film above the battery cell (10).

2. The pouch cell insulation test structure of claim 1, wherein, The probe part (23) comprises a positive electrode connecting wire (231) and a probe (232), one end of the positive electrode connecting wire (231) is connected with the first conductive part (21), the other end of the positive electrode connecting wire (231) is connected with the probe (232), and the probe (232) is located directly above the battery cell (10).

3. The pouch cell insulation test structure of claim 2, wherein, The probe (232) is provided with a sharp part (2321) at one end close to the aluminum plastic film of the battery cell (10) for conveniently piercing the aluminum plastic film.

4. The pouch cell insulation test structure of claim 1, wherein, The second conductive part (22) and the negative electrode (12) of the battery cell (10) are provided with a negative electrode connecting wire (24), one end of the negative electrode connecting wire (24) is connected with the second conductive part (22), and the other end of the negative electrode connecting wire (24) is connected with the negative electrode (12) of the battery cell (10).

5. The pouch cell insulation test structure of claim 1, wherein, The direct-current power supply device (20) is a direct-current power supply device (20) with adjustable voltage, and the adjustable voltage range of the direct-current power supply device (20) is 400-800V.

6. The pouch cell insulation test structure of claim 3, wherein, The battery cell (10) is provided with a pressing assembly (30) for fixing the battery cell (10) so that insulation test can be normally conducted, the pressing assembly (30) comprises a workbench (31), a fixing seat (32) and a driving member (33), the battery cell (10) is placed on the workbench (31), the fixing seat (32) is located on the workbench (31), the upper end of the fixing seat (32) is located directly above the battery cell (10), one side of the upper end of the fixing seat (32) towards the battery cell (10) is provided with a pressing block (34), the driving member (33) is fixed at the upper end of the fixing seat (32), and the output shaft of the driving member (33) is fixedly connected with the pressing block (34) downward.

7. The pouch cell insulation test structure of claim 6, wherein, The probe (232) is fixed on the pressing block (34) and penetrates through the pressing block (34), and the sharp part (2321) of the probe (232) extends out of the pressing block (34) by a certain distance.

8. The pouch cell insulation test structure of claim 7, wherein, The pressing block (34) is provided with a sliding assembly for adjusting the position of the probe (232), the sliding assembly comprises a sliding groove (341) provided on the pressing block (34) and a sliding block (342) slidingly arranged in the sliding groove (341), the sliding groove (341) is arranged along the length direction of the pressing block (34), the sliding block (342) can slide along the length direction of the sliding groove (341), the probe (232) is vertically arranged in the sliding block (342), and the sharp part (2321) of the probe (232) penetrates out of the sliding block (342) and is arranged towards the lower battery cell (10).

9. The pouch cell insulation test structure of claim 8, wherein, The length of the sharp part (2321) of the probe (232) penetrating out of the lower surface of the pressing block (34) is the depth of the probe (232) penetrating the aluminum plastic film of the battery cell (10).

10. The pouch cell insulation test structure of claim 8, wherein, The workbench (31) is provided with an insulating plate (40), and the pressing block (34) and the sliding block (342) are made of insulating materials.

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