阅读说明：本技术 一种电池电阻测量装置及方法 (Battery resistance measuring device and method ) 是由 马凯 张玉龙 俞飞 于 2019-09-30 设计创作，主要内容包括：本发明公开了一种电池电阻测量装置及方法,包括刺破机构和电阻测试仪,所述刺破机构包括气缸及其上固定的刺刀架、限位块和极耳压块,刺刀架上固定有刺刀；待电池运行至放料测试位置后,气缸带动极耳压块、限位块、刺刀向下运动,限位块固定电池顶封边,极耳压块将电池正负极压紧,刺刀刺破顶封边正负极耳之间的铝塑膜并接触到铝箔与负极极耳形成一个回路；所述电阻测试仪的正极探针与刺刀相连,负极探针与负极上的极耳压块相连。本发明采用刺刀式接触且刺破方向为垂直方向,从而加大了接触铝箔层面积,提高了测试电池阻值的精度；同时为保证电池的整体外观及性能效果,本装置加入限位块限制刺刀行程,防止刺破机构的刺刀刺铝塑膜过深。(The invention discloses a battery resistance measuring device and a method, which comprises a puncturing mechanism and a resistance tester, wherein the puncturing mechanism comprises an air cylinder, a puncturing knife rest, a limiting block and a lug pressing block which are fixed on the air cylinder, and a puncturing knife is fixed on the puncturing knife rest; after the battery runs to a discharge test position, the cylinder drives the lug pressing block, the limiting block and the bayonet to move downwards, the limiting block fixes the top sealing edge of the battery, the lug pressing block presses the positive and negative electrodes of the battery, and the bayonet pierces an aluminum-plastic film between the positive and negative electrode lugs of the top sealing edge and contacts the aluminum foil to form a loop with the negative electrode lug; and a positive probe of the resistance tester is connected with the bayonet, and a negative probe is connected with a lug pressing block on the negative electrode. According to the invention, the bayonet type contact is adopted, and the puncture direction is vertical, so that the area of contacting the aluminum foil layer is enlarged, and the accuracy of testing the resistance value of the battery is improved; meanwhile, in order to ensure the overall appearance and performance effect of the battery, a limiting block is added in the device to limit the stroke of the bayonet, so that the bayonet of the puncturing mechanism is prevented from puncturing the aluminum-plastic film too deeply.)

1. A battery resistance measuring device is characterized by comprising a puncturing mechanism and a resistance tester, wherein the puncturing mechanism comprises an air cylinder, a puncturing knife rest, a limiting block and a lug pressing block which are fixed on the air cylinder, and a puncturing knife is fixed on the puncturing knife rest;

after the battery runs to a discharge test position, the cylinder drives the lug pressing block, the limiting block and the bayonet to move downwards, the limiting block fixes the top sealing edge of the battery, the lug pressing block presses the positive and negative electrodes of the battery, and the bayonet pierces an aluminum-plastic film between the positive and negative electrode lugs of the top sealing edge and contacts the aluminum foil to form a loop with the negative electrode lug;

and the positive probe of the resistance tester is connected with the bayonet, the negative probe is connected with the lug pressing block on the negative electrode, and the resistance of the battery is measured.

2. The battery resistance measuring device according to claim 1, wherein after the battery runs to the discharge test position, the limiting block of the puncturing mechanism blocks the battery, so that one edge of the limiting block and the top sealing edge between the positive and negative electrode lugs of the battery are on the same plane.

3. The battery resistance measuring device according to claim 2, wherein the limiting block of the puncturing mechanism is pressed downwards to press the top sealing edge between the positive and negative electrode lugs of the battery, and a limiting groove for the operation of the bayonet is reserved at the side of the limiting block.

4. The battery resistance measuring device of claim 3, wherein the limiting groove has a depth of 1 mm.

5. The battery resistance measuring device according to claim 4, wherein the piercing mechanism tab pressing block and the piercing cutter are pressed down simultaneously, and the pressing block and the battery negative electrode tab are contacted with each other and pressed; the bayonet simultaneously contacts and punctures the sealed edge of the battery top and contacts the aluminum foil layer in the aluminum-plastic film.

6. The battery resistance measuring device of claim 5, wherein the puncture mechanism lancet does not exceed 1mm of the top seal edge of the aluminum plastic film when the puncture mechanism lancet is in depth.

Technical Field

The invention relates to a lithium ion battery, in particular to a battery resistance measuring device and a method.

Background

Lithium ion batteries have been widely used in the field of life of people, and have applications in portable consumer electronics such as mobile phones, notebook computers, cameras, and the like, as well as in new energy electric vehicles, aerospace, energy storage systems, and the like.

The current universal method for measuring the resistance of the lithium ion battery is a contact type or a needle prick type, and the contact type has the defects that poor contact is often caused, conductive cotton is frequently replaced and the like, so that the capacity of a production line is seriously influenced; the needle punching type battery resistance measuring device has the defects that the precision is not high, the measured battery resistance has certain errors, and when a nylon layer of an aluminum plastic film is punctured by a needle and contacts an aluminum foil, only a small area of contact or contact is unavailable, so that the measured battery resistance is inaccurate.

Disclosure of Invention

In order to solve the technical problem of the equipment, the invention provides a method for testing the resistance with high precision, which improves the productivity of testing the resistance of the lithium ion battery.

The technical scheme of the invention is as follows:

a battery resistance measuring device comprises a puncturing mechanism and a resistance tester, wherein the puncturing mechanism comprises an air cylinder, a puncturing tool rest, a limiting block and a lug pressing block which are fixed on the air cylinder, and a puncturing tool is fixed on the puncturing tool rest;

after the battery runs to a discharge test position, the cylinder drives the lug pressing block, the limiting block and the bayonet to move downwards, the limiting block fixes the top sealing edge of the battery, the lug pressing block presses the positive and negative electrodes of the battery, and the bayonet pierces an aluminum-plastic film between the positive and negative electrode lugs of the top sealing edge and contacts the aluminum foil to form a loop with the negative electrode lug;

and the positive probe of the resistance tester is connected with the bayonet, the negative probe is connected with the lug pressing block on the negative electrode, and the resistance of the battery is measured.

Preferably, after the battery runs at the discharging test position, the limiting block of the puncturing mechanism blocks the battery, so that the top sealing edge between one side of the limiting block and the positive and negative electrode lugs of the battery is on the same plane.

Preferably, the limiting block of the puncturing mechanism is pressed downwards to compress the top sealing edge between the positive and negative electrode lugs of the battery, and a limiting groove for the operation of the bayonet is reserved at the side of the limiting block.

Preferably, the depth of the limiting groove is 1 mm.

Preferably, the pole ear pressing block and the bayonet of the puncturing mechanism are pressed downwards simultaneously, and the pressing block is contacted with and pressed against the pole ear of the battery cathode; the bayonet simultaneously contacts and punctures the sealed edge of the battery top and contacts the aluminum foil layer in the aluminum-plastic film.

Preferably, the bayonet of the puncture mechanism can not exceed 1mm of the edge sealing at the top of the aluminum-plastic film when the bayonet is deeply inserted.

The invention has the beneficial effects that:

1. the device of the invention mainly changes the traditional needle prick type or contact type for testing the battery resistance into the bayonet type, and the puncture direction is vertical, thereby enlarging the area of the contact aluminum foil layer and improving the precision for testing the battery resistance;

2. meanwhile, in order to ensure the overall appearance and performance effect of the battery, the limiting block is added to limit the stroke of the bayonet, so that the bayonet of the bayonet mechanism is prevented from puncturing the aluminum-plastic film too deeply, and the puncturing depth of the bayonet is not more than 1mm of the top sealed edge of the aluminum-plastic film.

3. The device and the method are simple, low in cost and suitable for large-scale popularization and application.

Drawings

FIG. 1 is a schematic diagram of a lancing mechanism according to an embodiment of the present invention

FIG. 2 is a schematic view of a lancing mount of a lancing mechanism in an embodiment of the present invention;

FIG. 3 is a schematic view of a tab pressing block of the piercing mechanism in an embodiment of the present invention;

FIG. 4 is a schematic view of a lancet of the lancing mechanism in an example of the present invention;

fig. 5 is a schematic diagram of a limiting block of the lancing mechanism in an embodiment of the present invention.

Detailed Description

The following examples are provided to illustrate specific embodiments of the present invention.

As shown in figure 1, the battery resistance measuring device comprises a puncturing mechanism and a resistance tester, wherein the puncturing mechanism comprises an air cylinder, a puncturing knife rest 1 fixed on the air cylinder, a limiting block 2 and a lug pressing block 3, and a puncturing knife 4 is fixed on the puncturing knife rest 1. As shown in fig. 2-5, the structure of the bayonet holder 1, the limiting block 2, the tab pressing block 3 and the bayonet 4 are shown schematically, and each component is fixed as an integral mechanism by a hexagonal screw.

After the battery 6 runs to a discharge test position, the cylinder drives the lug pressing block 3, the limiting block 2 and the bayonet frame 1 to move downwards, the limiting block 2 fixes the top sealing edge of the battery 6, the lug pressing block 3 tightly presses the positive and negative lugs of the battery, and the bayonet 1 pierces an aluminum plastic film between the positive and negative lugs of the top sealing edge and contacts the aluminum foil to form a loop with the negative lug 5;

and a positive probe of the resistance tester is connected with the bayonet 4, a negative probe is connected with a tab pressing block 3 of the negative electrode, and the resistance of the battery is measured.

After the battery runs at the discharging test position, the limiting block of the puncturing mechanism blocks the battery, so that the top sealing edge between one side of the limiting block and the positive and negative electrode lugs of the battery is on the same plane.

The limiting block of the puncturing mechanism is pressed downwards to compress the top sealing edge between the positive electrode lug and the negative electrode lug of the battery, as shown in fig. 5, a limiting groove for the operation of the bayonet is reserved at the side of the limiting block, and the depth of the limiting groove is 1 mm. When the bayonet of the puncture mechanism is deeply inserted, the bayonet cannot exceed 1mm of the edge sealing at the top of the aluminum-plastic film.

The punching mechanism is characterized in that a lug pressing block and a bayonet are pressed down simultaneously, and the pressing block is contacted with and pressed tightly against a battery negative pole lug; the bayonet simultaneously contacts and punctures the sealed edge of the battery top and contacts the aluminum foil layer in the aluminum-plastic film.

5000 batteries are respectively tested by the traditional testing device and the testing device of the invention for comparison, and the failure rate and the efficiency data are as follows.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.