Aluminum plastic membrane of polymer lithium-ion power cell and shell punching method of aluminum plastic membrane

A power battery and aluminum-plastic film technology, which is applied in the field of lithium-ion batteries, can solve problems affecting the quality of polymer lithium-ion batteries, corrosion of aluminum-plastic films, and outgassing of batteries

Active Publication Date: 2015-03-04
DONGGUAN LIWINON ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The packaging of the existing batteries is generally packaged with aluminum-plastic film. However, the existing aluminum-plastic film shelling methods all use an aluminum-plastic film molding device to punch the shell, and the aluminum-plastic film body 1 is punched out for the battery. The first groove 2 and the second groove 3 (such as figure 1 As shown), since the exposed tab part of the cell will have a certain slope after welding and the empty foil itself has a certain thickness, the existing punching method will cause the aluminum-plastic film at the exposed part of the cell package to be squeezed, affecting The appearance of the battery, what is more serious is that the extruded part of the aluminum-plastic film is easily punctured by the exposed empty foil and the soldering of the tabs, which will cause the aluminum-plastic film to corrode from the inside, which will cause the battery cell to bulge, leak, etc. Phenomenon that affects the quality of polymer lithium-ion batteries

Method used

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  • Aluminum plastic membrane of polymer lithium-ion power cell and shell punching method of aluminum plastic membrane
  • Aluminum plastic membrane of polymer lithium-ion power cell and shell punching method of aluminum plastic membrane
  • Aluminum plastic membrane of polymer lithium-ion power cell and shell punching method of aluminum plastic membrane

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Experimental program
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Effect test

specific Embodiment approach 1

[0022] Specific implementation mode 1, like figure 2 As shown, an aluminum-plastic film of a polymer lithium-ion power battery includes an aluminum-plastic film body 10 and a groove 4 arranged on the aluminum-plastic film body 10, and the groove 4 includes a first groove 20 and the first groove 20. 20 are parallel to the second grooves 30 , both ends of the first groove 20 and the second groove 30 are provided with slopes 40 , and the structural dimensions of the slopes 40 at each place are the same. When the slope 40 is set as a linear slope, the slope of the slope 40 is 15-35°, and the length of the slope 40 is 5-10 mm. When the slope and length of the slope 40 are selected in this range, it is convenient for the electric core body to better cooperate with the first groove 20 and the second groove 30 on the aluminum-plastic film body 10, and avoid the aluminum-plastic film from wrinkling. Corrosion, swelling and leakage inside the battery.

[0023] Generally, the depth ...

specific Embodiment approach 2

[0024] Specific implementation mode 2, like image 3 As shown, the difference from the specific embodiment 1 is that in this embodiment, one end of the first groove 20 and the second groove 30 is provided with a slope 40, and the slope 40 is configured as an arc-shaped slope. The main reason is that when the cell body is relatively thick, if the linear slope of Embodiment 1 is adopted, it may cause the slope 40 of Embodiment 1 to collapse while the sides of the slope still bulge. A sharp corner is formed at the junction of the surface and the top edge, which eventually leads to easy damage to the sharp corner after packaging. When this happens, it is necessary to make the slope 40 into a certain radian, so that the handover position between the slope 40 and the top sealing edge after packaging is relatively gentle without sharp corners, thereby avoiding the risk of damage to the aluminum-plastic film.

[0025] Preferably, when the slope 40 is set as an arc-shaped slope, the...

specific Embodiment approach 3

[0027] Specific embodiment 3, like figure 2 and 3 As shown, an aluminum-plastic film shell punching method for a polymer lithium-ion power battery in Embodiment 1 or Embodiment 2 is to punch out two symmetrically on both sides of the center line of the aluminum-plastic film body 10 for encapsulating the polymer. The groove 4 of the lithium-ion battery core, and the slope 40 at the connection between the groove 4 and the aluminum-plastic film body 10 .

[0028] Preferably, the aluminum-plastic film body 10 is arranged in a square structure or a strip structure. When the aluminum-plastic film body 10 is arranged in a square structure, the first groove 20 and the second groove 30 are arranged longitudinally, and both ends of the first groove 20 and the second groove 30 are provided with slopes 40, such a structure It is suitable for the case where the tabs are distributed on the exposed parts at both ends of the battery core body. When the aluminum-plastic film body 10 is a...

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Abstract

The invention belongs to the technical field of lithium-ion cells, and particularly relates to an aluminum plastic membrane of a polymer lithium-ion power cell. The aluminum plastic membrane comprises an aluminum plastic membrane body and grooves formed in the aluminum plastic membrane body, wherein the grooves comprise a first groove and a second groove which is formed in parallel to the first groove; slopes are respectively arranged at one ends or both ends of the first groove and the second groove. According to the invention, an electric core is in better fit with the first groove and the second groove of the aluminum plastic membrane, the situation that the inner part of the aluminum plastic membrane is cut through due to the extrusion of an exposed part of the electric core is avoided, the risks of corrosion, protrusion and leakage of the inner part of the electric core are further reduced, and the quality and the appearance of the polymer lithium-ion power cell are ensured; in addition, the invention further discloses a shell punching method of the aluminum plastic membrane of the polymer lithium-ion power cell.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to an aluminum-plastic film of a polymer lithium-ion power battery and a casing punching method thereof. technical background [0002] At present, due to the large capacity and thick thickness of polymer lithium-ion power battery cells, there are generally empty foils on the top and bottom of the battery cells, and at the same time, tabs are welded on the empty foils to reduce the internal resistance of the battery and ensure high-rate discharge. Require. The packaging of the existing batteries is generally packaged with aluminum-plastic film. However, the existing aluminum-plastic film shelling methods all use an aluminum-plastic film molding device to punch the shell, and the aluminum-plastic film body 1 is punched out for the battery. The first groove 2 and the second groove 3 (such as figure 1 As shown), since the exposed tab part of the cell will have a certain ...

Claims

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Application Information

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IPC IPC(8): H01M2/02B21D22/02B21D37/10H01M50/105H01M50/116
CPCB21D22/02B21D37/10H01M50/10Y02E60/10
Inventor 戈志敏于紫阳
Owner DONGGUAN LIWINON ENERGY TECH
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