A new type of soft-pack battery with folded edge packaging

Abstract

The invention provides a novel folded-edge packaged soft-pack battery, which relates to the technical field of batteries. The packaging bag is made of a sheet aluminum-plastic film into a square tubular shell; the bare battery core is provided with two pole ears at the outer end, and the middle end of the pole ear is provided with pole ear glue; the bare battery core is installed in the shell, and the upper and lower ends of the shell are provided with edge sealing parts, the edge sealing parts are sealed and folded, the square tubular shell is sealed, and the edge sealing part is fixed to the pole ear glue at the top, the sheet aluminum-plastic film is shaped into a rectangular body through surrounding shaping, and the two ends are fixed by hot pressing to form a composite seam to form a square tubular shell with upper and lower openings, the height of the edge sealing part in the Y-axis direction is greater than or equal to the thickness of the square tubular shell in the Z-axis direction, the soft-pack battery has no punching action in the whole process, the risk of aluminum-plastic film rupture is reduced, and the thickness direction of the manufactured battery is not limited by the punching depth of the aluminum-plastic film, and the size of the battery will be increased by only increasing the size of the square tubular shell and the size of the bare battery core, thereby improving the capacity of the battery core and the energy density of the module.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and more specifically, to a novel folded-edge packaged soft-pack battery. Background Art

[0002] The existing traditional packaging structure and method of soft-pack batteries is to punch and shape the aluminum-plastic film to obtain a pit that matches the size of the bare battery cell, and then use two pieces of aluminum-plastic films with pits to cover the bare battery cell from the front and back sides respectively, and finally complete the packaging by hot pressing the four edges (such as Fig. 9 as shown).

[0003] The traditional soft-pack battery packaging structure has the following drawbacks and shortcomings: 1. The aluminum-plastic film needs to be punched, and the maximum thickness of the battery cell that can be produced is limited by the depth of the punched pit of the aluminum-plastic film. The punched depth of a single piece of aluminum-plastic film is limited. If the punched pit is too deep, it will cause the aluminum-plastic film to rupture. The current punched pit depth on the market is 6mm-8mm, which limits the thickness of the soft-pack battery, reduces space utilization, and cannot increase energy density. 2. The pit of the aluminum-plastic film needs to accommodate the bare battery cell. The area of ​​the punched pit is large, and the aluminum-plastic film has the risk of cracking due to the punched pit. This undesirable phenomenon is difficult to detect, resulting in safety risks for the battery cell. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the traditional soft-pack battery packaging structure limits the thickness of the soft-pack battery, and the battery cell has safety risks. In view of the problems existing in the prior art, a new type of folded-edge packaged soft-pack battery is provided.

[0005] The purpose and effect of the present invention are achieved by the following specific technical means: A new type of folded edge packaged soft pack battery, comprising: The packaging bag is made of a sheet of aluminum-plastic film into a square tube-shaped shell; The bare cell has two tabs at the outer end and tab glue at the middle end of the tab; The bare battery cell is installed in the shell, and the upper and lower ends of the shell are provided with edge sealing parts, the edge sealing parts are sealed and folded, the square tube shell is sealed, and the edge sealing part at the top is fixed with the ear glue; This design preforms the packaging bag into a square tubular shell, directly packaging the bare battery cell with fast edge sealing.

[0006] A further preferred solution is that the sheet-like aluminum-plastic film is shaped into a rectangular body through surrounding shaping, and both ends are fixed by hot pressing to form a composite seam, forming a square tube-shaped shell with upper and lower openings.

[0007] A further preferred solution: the height of the edge sealing portion in the Y-axis direction is ≥ the thickness of the square tubular shell in the Z-axis direction; In this design, the edge sealing part has enough folding length to facilitate sealing.

[0008] A further preferred solution: the bare cell enters the square tubular housing from top to bottom or from bottom to top, and brackets are provided on both sides of the bare cell; In this design, when the bare battery cell enters the square tubular shell, the bracket can support the shape of the square tubular shell to avoid deformation.

[0009] A further preferred solution is that the outer ends of the edge sealing portions are closed and then hot pressed to form a sealed edge sealing section, and the width of the edge sealing section is at least 2 mm.

[0010] Preferably, the edge sealing section is folded onto the edge sealing portion, and both ends of the edge sealing portion are folded to be tightly attached to the outer surface of the square tubular shell.

[0011] A further preferred solution is that during the process of closing the outer end of the edge sealing portion, the tab glue is wrapped, and the edge sealing section and the tab glue are fixed by hot pressing.

[0012] Beneficial effects of the present invention: The soft-pack battery has no punching action in the whole process, which reduces the risk of aluminum-plastic film rupture, and the thickness direction of the finished battery is not limited by the depth of the punching of the aluminum-plastic film. The size of the battery can be increased by simply increasing the size of the square tubular shell and the size of the bare battery cell. Compared with traditional soft-pack batteries, it can be thicker and larger in size. The number of battery cells can be reduced in the later module assembly, and the module assembly space utilization rate is higher, which effectively improves the capacity of the battery cell and the energy density of the module. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the installation of the packaging bag and the bare cell structure of the present invention (edge ​​sealing of the top edge sealing section); Figure 3 This is a schematic diagram of the installation of the packaging bag and the bare cell structure of the present invention (the top edge sealing section is folded); Figure 4 This is a schematic diagram of the installation of the packaging bag and the bare cell structure of the present invention (bottom edge sealing section edge sealing); Figure 5 This is a schematic diagram of the installation of the packaging bag and the bare battery cell structure of the present invention (the bottom edge sealing section is folded); Figure 6 This is a schematic diagram of the installation of the packaging bag and the bare cell structure of the present invention (the tabs lie flat); Figure 7 This is a schematic diagram of the installation of the bare battery cell and the bracket structure of the present invention; Figure 8 This is a perspective view of the soft-pack battery structure of the present invention; Fig. 9Schematic diagram of the packaging structure of a traditional soft-pack battery.

[0015] Figure 1-Figure 8 Middle: packaging bag (1), composite seam (101), edge sealing portion (2), edge sealing section (201), bare battery cell (3), tab (301), tab glue (302), and bracket (4). DETAILED DESCRIPTION

[0016] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The following embodiments are only examples of implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the scope of the present invention are all within the scope of patent protection of the present invention.

[0017] See also Figure 1-Figure 8 , a new type of folded edge packaged soft pack battery, comprising: The packaging bag 1 is made of a sheet aluminum-plastic film into a square tube shell. In the initial state, the packaging bag 1 is a sheet aluminum-plastic film. The sheet aluminum-plastic film is wrapped and shaped into a rectangular body. The shaping method can be a tooling angle folding. When wrapping, the ends of the aluminum-plastic film are overlapped, and the overlap width is preferably ≥ 2mm. The ends are fixed by hot pressing the overlap position to form a composite seam 101, thereby forming a square tube shell with upper and lower openings; Two tabs 301 are provided at the outer end of the bare cell 3, and tab glue 301 is provided at the middle end of the tab 301. The tab glue 301 is an insulating part on the tab 301, and its function is to prevent the tab 301 from contacting with the aluminum-plastic film and causing a short circuit during the later battery packaging. The bare battery cell 3 is placed into the square tubular shell from top to bottom or from bottom to top. In order for the square tubular shell to maintain its shape and to prevent the bare battery cell 3 from being scratched by the edge of the square tubular shell, the technician can install brackets 4 on both sides of the bare battery cell 3. The brackets 4 are concavely supported on both sides of the bare battery cell 3. The bare battery cell 3 is then placed into the square tubular shell, and the bare battery cell 3 is adjusted to the middle position of the square tubular shell so that edge sealing portions 2 are reserved at the upper and lower ends of the shell. The height of the reserved edge sealing portion 2 in the Y-axis direction should be ≥ the thickness of the square tubular shell in the Z-axis direction. The outer end of the edge sealing portion 2 is closed and hot-pressed to form a sealed edge sealing section 201 (such as Figure 2 and Figure 4 ), the width of the edge sealing section 201 is at least 2mm, which can ensure the sealing and avoid leakage in the later stage. Then, the edge sealing section 201 is folded and pressed against the shell. After pressing, triangular corners will appear at both ends. The triangular corners are folded and pressed against the left and right outer surfaces of the square tube shell (such as Figure 5 As shown in the figure), in order to prevent the folded corner from warping, you can use adhesive tape to stick the folded corner; Furthermore, the top edge sealing portion 2 should wrap the tab 301 with glue during the sealing process, and the edge sealing section 201 and the tab 301 with glue should be fixed by hot pressing (such as Figure 2 As shown in FIG. 2 ), the two are thermoformed into one to ensure sealing performance. When the edge sealing section 201 is folded, the tab 301 is folded together, and the tab 301 is in a lying position (as shown in FIG. 2 ). Figure 6 As shown), of course, those skilled in the art may also fold the pole ear 301 without folding it, and only fold the triangular corners at both ends of the edge sealing portion 2, and keep the pole ear 301 upright (as shown in FIG. Figure 3 As shown), the tab 301 can be designed to lie flat or stand upright according to the structure of the later battery module electrical connection; The edge sealing part 2 is sealed and folded, and the upper and lower ends of the square tube shell are sealed to form a soft pack battery (such as Figure 8 As shown in the figure, the whole process of the soft-pack battery does not involve punching, which reduces the risk of the aluminum-plastic film rupture, and the thickness direction of the manufactured battery is not limited by the punching depth of the aluminum-plastic film. The size of the battery will increase by simply increasing the size of the square tubular shell and the size of the bare battery cell 3. Compared with traditional soft-pack batteries, the battery can be thicker and larger in size. In the later module assembly, the number of battery cells can be reduced, the module assembly space utilization rate is higher, and the capacity of the battery cell and the energy density of the module are effectively improved.

Claims

1. A new type of folded edge packaged soft pack battery, characterized in that: include: The packaging bag is made of a sheet of aluminum-plastic film into a square tube-shaped shell; The bare cell has two tabs at the outer end and tab glue at the middle end of the tab; The bare battery cell is installed in the shell, and edge sealing parts are provided at the upper and lower ends of the shell. The edge sealing parts are sealed and folded, the square tubular shell is sealed, and the edge sealing part at the top is fixed to the ear glue.

2. According to claim 1, a new type of folded edge packaged soft pack battery is characterized in that: The sheet-like aluminum-plastic film is shaped into a rectangular body through surrounding shaping, and two ends are fixed by hot pressing to form a composite seam, forming a square tube-shaped shell with upper and lower openings.

3. According to claim 1, a new type of folded edge packaged soft pack battery is characterized in that: The height of the edge sealing portion in the Y-axis direction is greater than or equal to the thickness of the square tubular shell in the Z-axis direction.

4. According to claim 1, a new type of folded edge packaged soft pack battery is characterized in that: The bare battery core enters the square tubular shell from top to bottom or from bottom to top, and brackets are arranged on both sides of the bare battery core.

5. According to claim 1, a new type of folded edge packaged soft-pack battery is characterized in that: The outer end of the edge sealing portion is closed and hot pressed to form a sealed edge sealing section, and the width of the edge sealing section is at least 2 mm.

6. According to claim 5, a new type of folded edge packaged soft pack battery is characterized in that: The edge sealing section is folded at the edge sealing portion, and both ends of the edge sealing portion are folded and closely attached to the outer surface of the square tubular shell.

7. The novel folded-edge packaged soft-pack battery according to claim 5, characterized in that: During the closing process of the outer end of the edge sealing portion, the tab glue is wrapped, and the edge sealing section and the tab glue are fixed by hot pressing.

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