L-shaped tab and soft package battery structure

Abstract

The utility model discloses an L-shaped tab and a soft package battery structure, which belong to the technical field of batteries, the L-shaped tab comprises a battery cell main body and an L-shaped tab, the battery cell main body comprises a side edge sealing area, a top edge sealing area and a naked battery cell, the side edge sealing area and the top edge sealing area are sealed to form a closed space, the naked battery cell is arranged in the closed space, and the L-shaped tab is arranged in the closed space. The side edge sealing area comprises a side seal inner unsealed area and a side seal sealing area, the top edge sealing area comprises a top seal inner unsealed area, a top seal sealing area and a top seal outer unsealed area, and a heat seal sealing area is formed at the joint of the side seal inner unsealed area and the top seal inner unsealed area through heat seal; a notch is cut at the intersection of the top sealing area and the side sealing area, PP glue covers the long tab handle, the PP glue comprises exposed PP glue, the exposed PP glue is arranged outside the outer unsealed area, and the long tab handle, the exposed PP glue and the top edge sealing area are bent to form a top edge L-shaped or top edge side U-shaped edge folding structure. Through the battery structure, the battery length is reduced, and the space utilization rate of the battery structure is improved.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically an L-shaped tab and a soft-pack battery structure. Background Technology

[0002] With the commercialization of lithium-ion cells, the market has been constantly exploring ways to improve the energy density of lithium-ion batteries. How to improve the energy density of lithium-ion batteries has always been a pursuit of technical personnel.

[0003] Traditional laminated battery cells or multi-tab wound pouch cells generally require the outer tabs to be soldered to the inner tabs of the bare cell, such as... Figure 1 As shown in the diagram, a typical outer electrode ear consists of three parts: a long electrode ear stem 10-1, PP glue 6, and a narrow electrode ear stem 10-2. The PP glue 6 and the narrow electrode ear stem 10-2 are close together.

[0004] like Figure 4 As shown in the diagram of a conventional laminated or multi-tab wound bare cell, the narrow tab 10-2 of the outer tab is welded to the inner tab 9. To improve energy density, the narrower the tab 10-2 is designed, the better. However, an excessively narrow tab will cause the welding position to be close to the PP adhesive 6. When the welding energy is too high, it is easy to cause the PP adhesive 6 to melt at high temperature, which will reduce the reliability of the package. When the welding energy is too low, although the risk of PP adhesive 6 melting is reduced, the reliability of the package will be reduced. Therefore, this has always been a difficult point for pouch laminated cells or multi-tab wound cells.

[0005] like Figure 6 As shown in the schematic diagram of a conventional pouch battery structure, the top seal of the pouch battery consists of an unsealed area 3-1 inside the top seal, a sealed area 3-2 inside the top seal, an unsealed area 3-3 outside the top seal, exposed PP adhesive 6-1, and tabs 7. The side seal consists of an unsealed area 2-1 inside the side seal and a sealed area 2-2 inside the side seal. The function of the top seal area 3-2 and the side seal area 2-2 is to seal, ensuring that the electrolyte inside the pouch battery does not leak out and that outside air does not enter the cell. This sealed area needs to have a certain width to ensure battery reliability. The main functions of sealing area 3-1 and unsealed area 2-1 inside the side seal are to prevent excess adhesive from accumulating and reduce the probability of cell corrosion. The function of unsealed area 3-3 outside the top seal is to prevent excess adhesive from accumulating and overflowing after sealing. The function of exposed PP adhesive 6-1 is to prevent cell tabs from contacting the aluminum layer of the aluminum-plastic film, which could lead to cell corrosion. The widths of unsealed area 3-1 inside the top seal, sealing area 3-2 inside the top seal, unsealed area 3-3 outside the top seal, and exposed PP adhesive 6-1 all have their own functions and require a certain width. The narrower the total width, the more helpful it is for improving battery energy density.

[0006] like Figure 6As shown in the schematic diagram of a conventional soft-pack battery structure, there is no need to seal in the heat-sealing area 4, and there is no need to cut a notch at the intersection 5 of the top sealing area 3-2 and the side sealing area 2-2.

[0007] like Figure 11 As shown in the side view of a conventional stacked or multi-tab wound soft-pack battery structure, the minimum design width of the unsealed area 3-1 inside the top seal is 2mm, the minimum width of the top seal sealing area 3-2 is 2mm, the width of the unsealed area 3-3 outside the top seal is 1mm, and the width of the exposed PP adhesive 6-1 is 2mm. The total minimum width of the unsealed area 3-1 inside the top seal, the top seal sealing area 3-2, the unsealed area 3-3 outside the top seal, and the exposed PP adhesive 6-1 is approximately 7mm, and the average design width of the top seal area is approximately 10mm.

[0008] Patent No. 202022065752.X describes a method that reduces the length of the battery cell by pre-bending the inner tab and then welding a three-dimensional tab to the bent inner tab. Theoretically, this method can reduce the length space. However, the inner tab is made of multiple layers of copper or aluminum foil welded together, making it difficult to bend further. In addition, the three-dimensional tab requires reinforcement and welding paste to assist in the stability of the welding. This structure is quite difficult to implement, especially in terms of how to weld the inner tab to the three-dimensional tab. Therefore, it is still necessary to find a new structural method that can improve energy density and is easy to implement. Utility Model Content

[0009] To reduce the top seal width, increase energy density, and improve packaging and welding reliability, this invention proposes an L-shaped tab structure and a pouch battery structure based on conventional single-sided tab cells. This is achieved through the following technical solutions:

[0010] An L-shaped tab and pouch battery structure includes a cell body and an L-shaped tab. The cell body includes a side sealing area, a top sealing area, and a bare cell. The side sealing area and the top sealing area are sealed to form a closed space. The bare cell is disposed in the closed space. The side sealing area includes an unsealed area inside the side seal and a sealed area inside the side seal. The top sealing area includes an unsealed area inside the top seal, a sealed area inside the top seal, and an unsealed area outside the top seal. The unsealed area inside the side seal and the unsealed area inside the top seal are connected by heat sealing to form a heat-sealed area.

[0011] The L-shaped electrode includes a first L-shaped electrode and a second L-shaped electrode. The first L-shaped electrode includes a long electrode handle and a first transverse electrode handle connected to the long electrode handle. The second L-shaped electrode includes a long electrode handle and a second transverse electrode handle connected to the long electrode handle. The first transverse electrode handle is welded to the first inner electrode on the bare battery cell, and the second transverse electrode handle is welded to the second inner electrode on the bare battery cell.

[0012] The top sealing area and the side sealing area are cut with a notch. The long electrode lug is covered with PP glue, including exposed PP glue, which is located outside the unsealed area. The long electrode lug, exposed PP glue and top sealing edge area are bent to form a top edge L-shaped or top edge side U-shaped folded edge structure.

[0013] Furthermore, the width of the first transverse pole handle is 1.1-4.0 times the width of the long pole handle, preferably 2 times.

[0014] Furthermore, the width of the second transverse pole handle is 1.1-4.0 times, preferably 2.0 times, the width of the long pole handle.

[0015] Furthermore, the width of the unsealed area inside the top seal is 1-10mm, preferably 2-6mm.

[0016] Furthermore, the cross-sectional shape of the heat-sealed area is a combination of one or more shapes, such as fan-shaped, triangular, rectangular, and square, with a surface area of ​​1-100 mm². 2 Between 5-25mm is preferred. 2 .

[0017] Furthermore, the cut portion at the intersection is in the shape of one or more shapes, such as square, rectangle, or sector, with a surface area of ​​1-100 mm². 2 Between 5-20mm is preferred. 2 .

[0018] Furthermore, the total number of bends in the long electrode lug, exposed PP adhesive, and top sealing area is 2-5 times, preferably 2 times.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. Through the novel irregular tab and battery structure, multiple benefits can be achieved for stacked cells or multi-tab wound cells, including improved energy density, i.e., reducing the width of the top seal end. Compared with the traditional design, the total width of the top seal area, including the unsealed area, the sealed area, the unsealed area outside the top seal, the exposed PP glue, and the long tab stem, can be reduced by 2-4mm after bending, compared with the extreme 7mm top seal end design. The improvement in top edge space utilization is more than 28% in conventional cases, and the extreme improvement can reach more than 60%.

[0021] 2. Since the welding position is no longer close to PP glue 6, the high-temperature heat transfer during welding is significantly lower than that of conventional cell structures, reducing the risk of PP glue melting at high temperatures and greatly improving the reliability of the packaging. Attached Figure Description

[0022] The present invention will be further described with reference to the accompanying drawings, but the content of the drawings does not constitute any limitation on the present invention.

[0023] Figure 1 This is a schematic diagram of a conventional electrode structure;

[0024] Figure 2 This is a schematic diagram of the first L-shaped electrode structure;

[0025] Figure 3 This is a schematic diagram of the second L-shaped electrode structure;

[0026] Figure 4 This is a schematic diagram of a conventional bare battery cell structure;

[0027] Figure 5 This is a schematic diagram of a conventional pouch cell structure;

[0028] Figure 6 A schematic diagram of the structure of a novel bare battery cell with tabs;

[0029] Figure 7 This is a schematic diagram of a novel soft-pack battery cell structure.

[0030] Figure 8 This is a side view of the U-shaped folded edge battery cell structure at the top end.

[0031] Figure 9 This is a side view of the L-shaped folded edge battery cell structure at the top sealing end;

[0032] Figure 10 This is a side view of the L-shaped folded edge battery cell structure at the top sealing end;

[0033] Figure 11 This is a side view of the top seal structure of a conventional battery cell.

[0034] In the diagram: 1. Battery cell body; 1-1. Bare battery cell; 2. Side sealing area; 2-1. Unsealed area inside the side seal; 2-2. Side seal area; 3. Top sealing area; 3-1. Unsealed area inside the top seal; 3-2. Top seal area; 3-3. Unsealed area outside the top seal; 4. Heat-sealed area; 5. Intersection; 6. PP adhesive; 6-1. Exposed PP adhesive; 7. L-shaped tab; 7-1. Long tab handle; 7-2. First transverse tab handle; 7-3. Second transverse tab handle; 9-1. First inner tab; 9-2. Second inner tab; 10. Conventional outer tab; 10-1. Conventional long tab handle; 10-2. Conventional narrow tab handle; 11. Adhesive layer between the two folded edges of the side U-shape; 12. Adhesive layer between the L-shaped vertical edge and the battery cell body; 13. The adhesive layer between the L-shaped vertical edge and the exposed PP adhesive. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model; that is, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The components of the embodiments of the present utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] In some embodiments, the battery cell body 1 and L-shaped tabs 7 are included. The battery cell body 1 includes a side sealing area 2, a top sealing area 3 and a bare battery cell 1-1. The side sealing area 2 and the top sealing area 3 are sealed to form a closed space. The bare battery cell 1-1 is disposed in the closed space. The side sealing area 2 includes an unsealed area 2-1 inside the side sealing and a sealed area 2-2 inside the side sealing. The top sealing area 3 includes an unsealed area 3-1 inside the top sealing, a sealed area 3-2 inside the top sealing and an unsealed area 3-3 outside the top sealing. The intersection of the unsealed area 2-1 inside the side sealing and the unsealed area 3-1 inside the top sealing is heat-sealed to form a heat-sealed area 4.

[0038] The L-shaped tab 7 includes a first L-shaped tab and a second L-shaped tab. The first L-shaped tab includes a long tab handle 7-1 and a first transverse tab handle 7-2 connected to the long tab handle 7-1. The second L-shaped tab includes a long tab handle 7-1 and a second transverse tab handle 7-3 connected to the long tab handle 7-1. The first transverse tab handle 7-2 is welded to the first inner tab 9-1 on the bare cell 1-1. The second transverse tab handle 7-3 is welded to the second inner tab 9-2 on the bare cell 1-1.

[0039] The intersection 5 of the top sealing area 3-2 and the side sealing area 2-2 is cut with a notch. The long electrode handle 7-1 is covered with PP glue 6, which includes exposed PP glue 6-1. The exposed PP glue 6-1 is located outside the unsealed area 3-3. The long electrode handle 7-1, the exposed PP glue 6-1 and the top sealing area 3 are bent to form a top edge L-shaped or top edge side U-shaped folded edge structure.

[0040] The width of the first transverse pole handle 7-2 is 1.1-4.0 times the width of the long pole handle 7-1, preferably 2 times.

[0041] The width of the second transverse pole handle 7-3 is 1.1-4.0 times, preferably 2.0 times, the width of the long pole handle 7-1.

[0042] The width of the unsealed area 3-1 inside the top seal is 1-10mm, preferably 2-6mm.

[0043] The heat-sealing area 4 has a cross-sectional shape that is one or more of the following: fan-shaped, triangular, rectangular, and square, with a surface area of ​​1-100 mm². 2 Between 5-25mm is preferred. 2 .

[0044] The cut portion at the intersection 5 is in the shape of one or more shapes, such as square, rectangle, or fan, with a surface area of ​​1-100 mm². 2 Between 5-20mm is preferred. 2 .

[0045] The total number of bends for the long pole lug 7-1, the exposed PP glue 6-1, and the top sealing edge area 3 is 2-5 times, preferably 2 times. Detailed Implementation Method 1

[0046] The battery structure of this utility model will be described in detail below with reference to the accompanying drawings: an L-shaped electrode with a U-shaped folded edge on the side.

[0047] Reference Figure 2 , Figure 3 , Figure 5 , Figure 7 , Figure 8 According to the battery structure of this utility model, it includes a cell body 1, a side sealing edge area 2, an unsealed area inside the side sealing edge 2-1, a side sealing area 2-2, a top sealing edge area 3, an unsealed area inside the top sealing edge 3-1, a sealing area 3-2, an unsealed area outside the top sealing edge 3-3, a heat-sealed area 4 between the unsealed area inside the top edge 3-1 and the unsealed area inside the side edge 2-1, a junction 5 between the sealing area 3-2 at the top edge and the sealing area 2-2 at the side edge, PP glue 6, exposed PP glue 6-1, a first inner electrode tab 9-1, a second inner electrode tab 9-2, a long electrode tab handle 7-1, a first lateral electrode tab handle 7-2, a second lateral electrode tab handle 7-3, and an adhesive layer 11 between the exposed PP glue 6-1 at the top edge bending area and the unsealed area 3-1.

[0048] Reference Figure 2 According to the battery structure of this utility model, the width of the long electrode handle 7-1 is 20mm, and the width of the first transverse electrode handle 7-2 is designed to be 40mm.

[0049] Reference Figure 3 According to the battery structure of this utility model, the width of the long electrode handle 7-1 is 20mm, and the width of the second transverse electrode handle 7-3 is designed to be 40mm.

[0050] Reference Figure 5According to the battery structure of this utility model, the width of the first inner tab 9-1 on the bare cell 1-1 is designed to be 30mm, the width of the second inner tab 9-2 is designed to be 30mm, the first inner tab 9-1 is welded to the first transverse tab handle 7-2, and the second inner tab 9-2 is welded to the second transverse tab handle 7-3.

[0051] refer to Figure 7 According to the battery structure of this utility model, the top sealing area 3 is designed as follows: the width of the unsealed area 3-1 inside the top seal is 4 + / - 0.2 mm; the width of the top seal sealing area 3-2 is 4.0 + / - 0.2 mm; and the width of the outer unsealed area sealing edge 3-3 is 1 + / - 0.2 mm. The side sealing area 2 is designed as follows: the width of the unsealed area 2-1 inside the side seal is 0.5 + / - 0.2 mm; and the width of the side seal sealing area 2-2 is 4 + / - 0.2 mm. The exposed PP adhesive 6-1 has a width not exceeding 2 mm. The heat-sealing sealing area 4 is designed as follows: the shape of the heat-sealing sealing area 4 is rectangular, with a length of 4 mm and a width of 4 mm. The sealing area of ​​the heat-sealing sealing area 4 is 16 mm². 2 The intersection 5 of the top sealing area 3-2 and the side sealing area 2-2 is cut into a rectangular shape. The width of the cut side sealing edge is 4mm, the width of the cut top sealing edge is 4mm, and the area of ​​the intersection 5 is approximately 16mm². 2 ;

[0052] Reference Figure 8 According to the battery structure of this utility model, the top seal edge sealing area 3-3 and the long electrode handle 7-1 are bent respectively. After bending, the unsealed area 3-1 inside the top seal, the exposed PP glue 6-1 and the long electrode handle 7-1 are parallel to form a side U-shaped folded edge structure. An adhesive layer 11 is placed between the unsealed area 3-1 inside the top seal and the exposed electrode handle 6-1 in the bending area to prevent the folded edge from opening.

[0053] Reference Figure 8 According to the battery structure of this utility model, the top sealing edge width of the final battery does not exceed 6mm, which is an improvement of about 5mm compared with the traditional 11mm width structure, achieving an improvement of more than 40%. Detailed Implementation Method 2

[0054] The battery structure of this utility model will be described in detail below with reference to the accompanying drawings—it adopts an L-shaped electrode tab and implements an L-shaped folded edge structure on the top edge.

[0055] Reference Figure 2 , Figure 3 , Figure 5 , Figure 7 , Figure 8According to the battery structure of this utility model, it includes a cell body 1, a side sealing area 2, an unsealed area inside the side seal 2-1, a side seal area 2-2, a top sealing area 3, an unsealed area inside the top seal 3-1, a top seal area 3-2, an unsealed area outside the top seal 3-3, a heat-sealed area 4, a junction 5 between the top seal area 3-2 and the side seal area 2-2, PP glue 6, exposed PP glue 6-1, a first inner tab 9-1, a second inner tab 9-2, a long tab handle 7-1, a first lateral tab handle 7-2, a second lateral tab handle 7-3, and an adhesive layer 12 between the top L-shaped vertical edge and the cell body 1.

[0056] Reference Figure 2 According to the battery structure of this utility model, the width of the long electrode handle 7-1 is 25mm, and the width of the first transverse electrode handle 7-2 is designed to be 45mm.

[0057] Reference Figure 3 According to the battery structure of this utility model, the width of the long electrode handle 7-1 is 25mm, and the width of the second transverse electrode handle 7-3 is designed to be 45mm.

[0058] Reference Figure 5 According to the battery structure of this utility model, the width of the first inner tab 9-1 on the bare cell 1-1 is designed to be 28mm, the width of the second inner tab 9-2 is designed to be 28mm, the first inner tab 9-1 is welded to the first transverse tab handle 7-2, and the second inner tab 9-2 is welded to the second transverse tab handle 7-3.

[0059] refer to Figure 7 According to the battery structure of this utility model, the top sealing area 3 is designed as follows: the width of the unsealed area 3-1 inside the top seal is 3+ / -0.2mm, the width of the top seal sealing area 3-2 is 3+ / -0.2mm, and the width of the outer unsealed area sealing edge 3-3 is 1+ / -0.2mm. The side sealing area 2 is designed as follows: the width of the unsealed area 2-1 inside the side seal is 0.5+ / -0.2mm, and the width of the side seal sealing area 2-2 is 3+ / -0.2mm. The exposed PP adhesive 6-1 has a width not exceeding 2mm. The heat-sealing sealing area 4 is designed as follows: the shape of the heat-sealing sealing area 4 is rectangular, with a length of 4mm and a width of 3mm, and the sealing area of ​​the heat-sealing sealing area 4 is 12mm². 2 The intersection 5 of the top sealing area 3-2 and the side sealing area 2-2 is cut into a rectangular shape. The width of the cut side sealing edge is 4mm, and the width of the cut top sealing edge is 3mm. The area of ​​the intersection 5 is approximately 12mm². 2 ;

[0060] Reference Figure 8According to the battery structure of this utility model, the top sealing edge sealing area 3-3 and the long electrode handle 7-1 are bent respectively. After bending, the unsealed area 3-1 inside the top seal is perpendicular to the exposed PP glue 6-1 and the long electrode handle 7-1 is perpendicular to the exposed PP glue 6-1 to form a top edge L-shaped folded edge structure. The top edge L-shaped vertical edge is bonded to the cell body 1 with an adhesive layer 12 to prevent the folded edge from opening.

[0061] Reference Figure 8 According to the battery structure of this utility model, the top seal width of the final battery is no more than 5mm, which is an improvement of about 5mm compared with the conventional 9mm width structure, achieving an improvement of more than 40%. Detailed Implementation Method 3

[0062] The battery structure of this utility model will be described in detail below with reference to the accompanying drawings: it adopts an L-shaped electrode and implements an L-shaped folded edge structure on the top edge.

[0063] Reference Figure 2 , Figure 3 , Figure 5 , Figure 7 , Figure 8 According to the battery structure of this utility model, it includes a cell body 1, a side sealing area 2, an unsealed area inside the side seal 2-1, a side seal area 2-2, a top sealing area 3, an unsealed area inside the top seal 3-1, a top seal area 3-2, an unsealed area outside the top seal 3-3, a heat-sealed area 4, a junction 5 between the top seal area 3-2 and the side seal area 2-2, PP glue 6, exposed PP glue 6-1, a first inner tab 9-1, a second inner tab 9-2, a long tab handle 7-1, a first lateral tab handle 7-2, a second lateral tab handle 7-3, and an adhesive layer 12 between the top L-shaped vertical edge and the cell body 1.

[0064] Reference Figure 2 According to the battery structure of this utility model, the width of the long electrode handle 7-1 is 25mm, and the width of the first transverse electrode handle 7-2 is designed to be 50mm.

[0065] Reference Figure 3 According to the battery structure of this utility model, the width of the long electrode handle 7-1 is 25mm, and the width of the second transverse electrode handle 7-3 is designed to be 50mm.

[0066] Reference Figure 5 According to the battery structure of this utility model, the width of the first inner tab 9-1 on the bare cell 1-1 is designed to be 30mm, the width of the second inner tab 9-2 is designed to be 30mm, the first inner tab 9-1 is welded to the first transverse tab handle 7-2, and the second inner tab 9-2 is welded to the second transverse tab handle 7-3.

[0067] refer to Figure 7According to the battery structure of this utility model, the top sealing area 3 is designed as follows: the width of the unsealed inner area 3-1 is 5 + / - 0.2 mm, the width of the top sealing area 3-2 is 5.0 + / - 0.2 mm, and the width of the outer unsealed area sealing edge 3-3 is 1 + / - 0.2 mm. The side sealing area 2 is designed as follows: the width of the unsealed inner area 2-1 is 0.5 + / - 0.2 mm, and the width of the side sealing area 2-2 is 5 + / - 0.2 mm. The exposed PP adhesive 6-1 has a width not exceeding 2 mm. The heat-sealing sealing area 4 is designed as follows: the shape of the heat-sealing sealing area 4 is rectangular, with a length of 5 mm and a width of 5 mm, and the sealing area of ​​the heat-sealing sealing area 4 is 25 mm². 2 The area 5 where the top seal 3-2 and the side seal 2-2 intersect is cut into a rectangle. The width of the cut side seal edge is 5mm, the width of the cut top seal edge is 5mm, and the area of ​​the intersection 5 is approximately 25mm². 2 ;

[0068] Reference Figure 10 According to the battery structure of this utility model, the top sealing edge sealing area 3-2 and the long electrode handle 7-1 are bent three times. After bending, the unsealed area 3-1 inside the top seal is perpendicular to the top sealing area 3-2, and the long electrode handle 7-1 is perpendicular to the exposed PP glue 6-1 to form a top edge L-shaped folded edge structure 2. There is an adhesive layer 12 between the top edge L-shaped vertical edge and the battery cell body 1, and an adhesive layer 13 is placed between the L-shaped vertical edge and the exposed PP glue 6-1 to prevent the folded edge from opening.

[0069] Reference Figure 10 According to the battery structure of this utility model, the top sealing edge width of the final battery does not exceed 6mm, which is an improvement of about 7mm compared with the traditional 13mm top edge width structure, achieving an improvement of more than 50%.

[0070] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An L-shaped tab and pouch cell structure, characterized in that, The battery cell body (1) and L-shaped tabs (7) are included. The battery cell body (1) includes a side sealing area (2), a top sealing area (3) and a bare battery cell (1-1). The side sealing area (2) and the top sealing area (3) are sealed to form a closed space. The bare battery cell (1-1) is located in the closed space. The side sealing area (2) includes an unsealed area inside the side sealing (2-1) and a side sealing area (2-2). The top sealing area (3) includes an unsealed area inside the top sealing (3-1), a top sealing area (3-2) and an unsealed area outside the top sealing (3-3). The unsealed area inside the side sealing (2-1) and the unsealed area inside the top sealing (3-1) are connected by heat sealing to form a heat-sealed area (4). The L-shaped tab (7) includes a first L-shaped tab and a second L-shaped tab. The first L-shaped tab includes a long tab handle (7-1) and a first transverse tab handle (7-2) connected to the long tab handle (7-1). The second L-shaped tab includes a long tab handle (7-1) and a second transverse tab handle (7-3) connected to the long tab handle (7-1). The first transverse tab handle (7-2) is welded to the first inner tab (9-1) on the bare cell (1-1). The second transverse tab handle (7-3) is welded to the second inner tab (9-2) on the bare cell (1-1). The top sealing area (3-2) and the side sealing area (2-2) are intersected at the notch (5). The long pole lug (7-1) is covered with PP glue (6). The PP glue (6) includes exposed PP glue (6-1). The exposed PP glue (6-1) is located outside the unsealed area (3-3). The long pole lug (7-1), the exposed PP glue (6-1) and the top sealing area (3) are bent to form a top edge L-shaped or top edge side U-shaped folded edge structure. 2.The L-shaped tab and pouch battery structure of claim 1, wherein, The width of the first transverse pole handle (7-2) is 1.1 to 4.0 times the width of the long pole handle (7-1). 3.The L-shaped tab and pouch battery structure of claim 1, wherein, The width of the second transverse pole handle (7-3) is 1.1-4.0 times the width of the long pole handle (7-1).

4. The L-shaped tab and pouch battery structure according to claim 3, characterized in that, The width of the unsealed area (3-1) inside the top seal is 1-10mm. 5.The L-shaped tab and pouch battery structure of claim 1, wherein, The heat seal area (4) is in the shape of one or more of a fan shape, a triangle, a rectangle, and a square, and has an area of 1-100 mm 2 . 6.The L-shaped tab and pouch battery structure of claim 1, wherein, The cutting portion of the intersection (5) is in the shape of one or more of a square, a rectangle, a sector, or a combination thereof, with an area of between 1-100 mm 2 . 7.The L-shaped tab and pouch battery structure of claim 1, wherein, The total number of bends of the long pole lug (7-1), exposed PP glue (6-1) and top sealing area (3) is 2-5.

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