Search

CN-122000564-A - Top-sealed-edge flexible-package battery structure easy to bend

CN122000564ACN 122000564 ACN122000564 ACN 122000564ACN-122000564-A

Abstract

The invention provides a top-sealed-edge flexible-packaged battery structure which comprises a battery core main body, side sealing areas at two sides of the battery core main body, a top sealing area at the top, a top sealing inner unsealed area, a top sealing area, a top sealing outer unsealed area, a tab and an exposed tab adhesive, wherein the sealing area is formed by setting the width of the top sealing inner unsealed area to be in the range of 0.5-5mm and by heat sealing at the junction of the top sealing inner unsealed area and the side sealing inner unsealed area, then a notch is cut at the junction of the top sealing area and the side sealing area, the top-sealed tab, the exposed PP adhesive and the top sealing area are bent for two or more times, and finally, a top L-shaped or top side U-shaped folded structure is formed, the length of the battery is reduced, and the space utilization rate of the battery structure is improved.

Inventors

  • FENG LI

Assignees

  • 冯理

Dates

Publication Date
20260508
Application Date
20241105

Claims (6)

  1. 1. A top-sealed-edge flexible-packaged battery structure is characterized in that the width of an unsealed area (3-1) in a top seal is 0.5-5mm, a seal area (4) is formed by heat sealing the junction of the unsealed area (3-1) in the top seal and the unsealed area (2-1) in a side seal, then a notch is cut at the junction (5) of the top-sealed seal area (3-2) and the side-sealed seal area (2-2), then lugs (7) are exposed out of PP glue (6), the top-sealed-edge area (3) is bent for two times or more, the bending mode is folding in a doubling or L-shaped manner, and finally a top-edge L-shaped or top-edge-side U-shaped folded structure is formed.
  2. 2. A top-sealed-edge pliable-pack battery structure according to claim 1, characterized in that the width of the unsealed area (3-1) in the top seal is 0.5-5.0mm, preferably 1.0-3.0mm.
  3. 3. A top-sealed-edge flexible soft-package battery structure as claimed in claim 1, wherein the junction (4) between the unsealed area (3-1) in the top seal and the unsealed area (2-1) in the side seal is in the shape of one or more of a sector, a triangle, a rectangle, a square and the like, and the area is between 0.25 and 30mm 2 , preferably between 0.5 and 10mm 2 .
  4. 4. The flexible battery structure with the top sealing edge being easy to bend as claimed in claim 1, wherein the cutting part of the junction (5) of the top sealing area (3-2) and the side sealing area (2-2) can be square, rectangle, fan-shaped or a combination of a plurality of shapes, and the cutting area is between 0.25 and 30mm 2 , preferably between 0.5 and 10mm 2 .
  5. 5. The flexible battery structure with the top edge sealed and easy to bend as claimed in claim 1, wherein the tab (7) and the exposed PP glue (6) are bent for 2-5 times, preferably 2 times, in the top edge sealed area (3).
  6. 6. A top-sealed-edge flexible battery structure according to claim 1, wherein the top-edge L-shaped folded structure is a folded part perpendicular to the unsealed area (3-1) in the top seal, and the top-edge U-shaped folded structure is a folded part parallel to the unsealed area (3-1) in the top seal.

Description

Top-sealed-edge flexible-package battery structure easy to bend Technical Field The invention relates to the field of soft-package batteries, in particular to a soft-package battery structure with a top edge seal easy to bend. Background With the development of commercialization of lithium ion batteries, the market demand for higher energy density has never stopped, and how to increase the energy density of lithium ion batteries is always a continuous pursuit of technicians; In order to ensure that the soft package lithium ion battery cell has good sealing effect, the battery cell needs to have a seal width with enough width, including a top seal width and a side seal width As shown in the plan schematic diagram of the structure of the traditional soft-packaged battery in fig. 1, the top end cap of the soft-packaged battery consists of an unsealed area 3-1 in the top end cap, a sealed area 3-2 in the top end cap, an unsealed area 3-3 outside the top end cap and an exposed PP (polypropylene) adhesive 6, and a tab 7, the side end cap consists of an unsealed area 2-1 in the side end cap, the functions of the sealed area 2-2 in the side end cap and the sealed area 3-2 in the side end cap are sealed, electrolyte in the soft-packaged battery is guaranteed not to flow out, and outside air does not enter the inside of a battery core, a certain width is needed in the sealed area to guarantee the reliability of the battery, the functions of the unsealed area 3-1 in the top end cap and the unsealed area 2-1 in the side end cap are mainly used for preventing glue overflow, the corrosion probability of the battery core is reduced, the functions of the unsealed area 3-3 are used for preventing glue from overflowing after sealing, the function of the exposed PP adhesive 6 is used for preventing the tab 7 from being contacted with an aluminum plastic aluminum film to lead to corrosion of the battery, the top end cap 3-1 and the bottom end cap 3-2 is used for sealing the function of the bottom end cap, the width is required to be narrower than the sealed area 3-3 and the whole width is required to be more than the sealed area to be more than the top end cap-3; The current limit is designed as that the minimum design width of the unsealed area 3-1 in the top seal is 0.5mm, the minimum width of the unsealed area 3-2 outside the top seal is 1mm, the width of the unsealed area 3-3 outside the top seal is 0.5mm, the width of the PP glue exposure 6 is 2mm, the unsealed area 3-1 in the top seal, the total minimum width of the sealed area 3-2 outside the top seal and the PP glue exposure 6 is about 4.0mm, as shown in a side view of a traditional soft package battery with a protection board in the illustration 3, the protection board 8 is placed in a top end sealing area through a bending tab 7, the bending position is about 0.5mm, and the width of the final top end sealing is more than 4.5 mm; As shown in the plan schematic view of the conventional soft-pack battery in FIG. 1, the junction 4 between the non-sealed area 3-1 in the top seal and the non-sealed area 2-1 in the side seal is not required to be sealed, a notch is not required to be cut at the junction 5 between the top seal area 3-2 and the side seal area 2-2, and the patent number 201621249737.8 can completely bend the top seal on the front end surface and the side seal on the corresponding side surfaces by clamping the folded corner edge between the top seal and the corresponding side seal between the top seal and the front end surface, so that the reduction of the battery structure in the length direction is reduced. The patent uses the two sides of the top seal to make the angle folding, so that the utilization of the top seal end space is improved to a certain extent, but the limitation in the specific implementation process exists, the side edge is not implemented by double folding, and the improvement is still needed continuously how to fully utilize the top seal end space. Disclosure of Invention In order to further reduce the width of the top sealing end, the invention provides a soft package battery structure with a top sealing edge easy to bend. The aim of the invention is achieved by the following technical scheme: As shown in the schematic diagram of the widening of the unsealed area in the top seal in FIG. 4, the width of the unsealed area 3-1 in the top seal is creatively increased from the traditional width of less than 0.5mm to between 0.5 and 5 mm; As shown in a heat sealing schematic diagram of an unsealed area in the top seal and an unsealed area in the side seal in fig. 5, a sealing area is formed by heat synthesizing a sealing area at a junction 4 between the unsealed area 3-1 in the top seal and the unsealed area 2-1 in the side seal, the sealing area is rectangular, square, fan-shaped and the like, and the area of the sealing area needs to be larger than 0.25mm 2, preferably larger than 0.5mm 2; As shown in the cutting schematic diagram of the junc