Soft package battery with folded edge

Abstract

The utility model relates to the technical field of battery manufacturing, in particular to a soft package battery with a folding edge, which comprises a main body, a pressing groove and a sealing edge are arranged on the side surface of the main body, embossing is arranged on the surfaces of the sealing edge and the pressing groove, bonding layers are arranged on two sides of the sealing edge, and the sealing edge is attached in the pressing groove and fixed in the pressing groove through the bonding layers. According to the soft package battery with the folding edge, the energy density of the soft package battery can be reduced, meanwhile, the adhesion degree between the sealing edge and the pressing groove is increased, and the structural stability of the soft package battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a soft-pack battery with folded edges. Background Art

[0002] Soft-pack batteries are thin, flexible lithium-ion batteries that consist of a positive electrode, a negative electrode, an electrolyte, and a separator. They are wrapped in multiple layers of soft packaging materials and have high energy density and flexibility. Traditional soft-pack batteries fold the edge seals directly onto the main body to increase energy density, but this folding method exposes the edge seal ports to the battery surface, which is exposed to the outside world and easily touched, resulting in loose adhesion or leakage. Existing soft-pack batteries use hot pressing to press grooves on the surface of the soft-pack batteries, and then fix the edge seals in the grooves. However, this method is difficult to ensure a good combination between the grooves and the edge seals. When the edge seals are not well bonded to the groove surface, the battery structure will be unstable, affecting the battery performance. Utility Model Content

[0003] In order to solve the problems in the above-mentioned background technology, the utility model provides a soft-pack battery with folded edges, which reduces the energy density of the soft-pack battery while increasing the adhesion between the sealed edge and the pressed groove, thereby improving the structural stability of the soft-pack battery.

[0004] The utility model solves the technical problem by adopting the following solution: a soft-pack battery with a folded edge, comprising a pressing groove and a sealing edge on the side of the main body, the sealing edge and the surface of the pressing groove are both provided with embossing, adhesive layers are provided on both sides of the sealing edge, and the sealing edge is attached to the pressing groove and fixed in the pressing groove through the adhesive layer.

[0005] By adopting the above technical solution, embossing increases the contact area between the embossed groove, the adhesive layer and the edge seal, thereby improving the sealing and structural stability of the soft-pack battery.

[0006] Furthermore, the edge sealing includes an inner folding part and an outer folding part, one side of the outer folding part is connected to the main body, and the other side of the outer folding part is connected to the inner folding part, and adhesive layers are provided on both side surfaces of the inner folding part, and an adhesive layer is provided on the surface of the groove.

[0007] By adopting the above technical solution, the inner folded portion on one side of the edge sealing port is folded inwardly until it overlaps with the outer folded portion, and then the edge sealing is fixed in the pressing groove, thereby further improving the sealing and waterproof properties of the edge sealing.

[0008] Furthermore, the exposed surface of the outer folded portion is flush with the exposed surface of the pressing groove.

[0009] By adopting the above technical solution, the structural stability of the soft-pack battery is improved, ensuring that it is not easily deformed or damaged during use, thereby improving its energy density.

[0010] Furthermore, the folded parts on both sides of the outer folding portion are arc folded.

[0011] By adopting the above technical solution, the folded part is an arc fold, which reduces the stress concentration at the folding place and avoids the generation of cracks at the edge folding. It helps to enhance the structural stability and bonding strength of the outer folded edge, ensuring that the soft-pack battery can maintain good sealing and durability during use.

[0012] Furthermore, the cross section of the groove is C-shaped.

[0013] By adopting the above technical solution, it is ensured that the edge sealing can be completely embedded in the pressing groove and maintain good sealing performance.

[0014] Furthermore, the surface material of the edge sealing is polyurethane, and the adhesive is polyurethane adhesive.

[0015] By adopting the above technical solution, polyurethane has higher mechanical strength, chemical stability and wear resistance, which improves the service life of soft-pack batteries and extends the battery usage time.

[0016] In summary, the beneficial effects of the utility model are as follows: both the pressing groove and the edge seal are provided with embossing, which increases the contact area between the pressing groove, the edge seal and the adhesive layer, increases the adhesion between the pressing groove and the edge seal, and makes the structure of the soft-pack battery more stable; the edge seal is divided into an inner folding part and an outer folding part, and the edge seal port is folded inward into the pressing groove, further improving the sealing and waterproof properties of the edge seal; the two sides of the outer folding part are arc folded, which helps to enhance the structural stability and bonding strength of the outer folding edge, ensuring that the soft-pack battery can maintain good sealing and durability during use, and at the same time, the arc design of the folded part helps to reduce stress concentration and avoid the generation of cracks at the folding of the edge seal; the cross-section of the pressing groove is C-shaped, ensuring that the edge seal can be completely embedded in the pressing groove to maintain good sealing performance.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the front view of this embodiment;

[0019] Figure 2 A side view of a soft-pack battery in this embodiment where the folding is not completed;

[0020] Figure 3 This is a front view of the soft-pack battery of this embodiment without completing the folding;

[0021] Figure 4 This is a schematic diagram of the structure of the edge sealing with the folded edge completed on one side of this embodiment

[0022] In the figure: 1, main body; 2, groove; 3, edge sealing; 31, inner folding part; 32, outer folding part; 4, adhesive layer. DETAILED DESCRIPTION

[0023] In order to make the content of the utility model more clearly understood, the utility model is further described below based on specific embodiments in combination with the accompanying drawings.

[0024] It should be noted that the terms "center", "upper", "lower", "front", "back", "left", "right", "inner", "outer" and the like used herein to indicate directions or positional relationships are based on directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. Unless otherwise specified, "plurality" means two or more.

[0025] Unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood by specific circumstances.

[0026] like Figures 1 to 4 As shown, a soft-pack battery with folded edges includes a main body 1. The main body 1 of this embodiment is an aluminum-plastic film shell and a liquid lithium-ion battery in the shell.

[0027] Specifically, Figure 2 As shown, both sides of the main body 1 are provided with a groove 2 and an edge seal 3, and the surface of the edge seal 3 and the groove 2 are both provided with embossing. The groove 2 on the side of the soft-pack battery in this embodiment is formed by hot pressing, and the mold used for pressing is provided with a pattern. During the pressing process, the soft-pack battery is affected by the pressure and temperature of the mold, thereby forming the required texture and pattern on the side of the soft-pack battery. Adhesive layers 4 are provided on both sides of the edge seal 3, and the edge seal 3 is attached to the groove 2 and fixed to the groove 2 through the adhesive layer 4. Through the above settings, the bonding area of ​​the edge seal 3 and the groove 2 is increased, the bonding strength is improved, and the structure of the soft-pack battery is more stable. At the same time, since the edge seal 3 is fixed in the groove 2, the volume of the soft-pack battery is reduced, and the energy density of the soft-pack battery is improved.

[0028] like Figure 3As shown, the edge seal 3 includes an inner folding portion 31 and an outer folding portion 32, one side of the outer folding portion 32 is connected to the main body 1, and the other side of the outer folding portion 32 is connected to the inner folding portion 31, and an adhesive layer 4 is provided on both sides of the inner folding portion 31, and an adhesive layer 4 is provided inside the pressing groove 2. When the edge seal 3 of this embodiment is not folded, the edge seal 3 is located at the bottom of the pressing groove 2. When bonding, the inner folding portion 31 on the outside of the edge seal 3 is folded toward the outer folding portion 32, at which time the outer end port of the inner folding portion 31 is located in the middle of the outer folding portion 32, and then the inner folding portion 31 is folded again in the same direction at the port position, and the edge seal 3 is folded into the inside of the pressing groove 2, and then the position where the edge seal 3 contacts the pressing groove 2 is bonded with an adhesive. Through the above design, since the ports of the edge seal 3 are located inside the folded edge seal 3, the sealing of the port part is further improved to prevent battery leakage.

[0029] like Figure 1 As shown, the bonded edge seal 3 is tightly attached to the inside of the pressed groove 2, and the exposed surface of the outer folded portion 32 is flush with the exposed surface of the pressed groove 2. Through the above arrangement, the sealing and protection of the soft-pack battery are improved, and the leakage of internal battery substances is prevented while effectively preventing the invasion of external substances. At the same time, the edge seal 3 is prevented from protruding outward, reducing the energy density or causing wear, thereby increasing the service life of the soft-pack battery.

[0030] like Figure 4 As shown, the folded parts on both sides of the outer folding part 32 are arc folded. When folding, the edge seal 3 is first folded, bonded and fixed, and then bonded and fixed in the pressing groove 2. Through the above arrangement, the stress concentration at the folding place is reduced, and the generation of cracks at the folding place of the edge seal 3 is avoided, which helps to enhance the structural stability and bonding strength of the outer folding part, ensuring that the soft-pack battery can maintain good sealing and durability during use.

[0031] like Figure 2 As shown, the cross section of the pressed groove 2 is C-shaped. Through the above arrangement, the sealing edge 3 can be tightly attached to the pressed groove 2, thereby improving the sealing performance of the bonding, preventing the entry of external substances, and preventing the internal leakage of the battery.

[0032] The surface material of the edge seal 3 of this embodiment is polyurethane, and the adhesive is polyurethane adhesive. The polyurethane material has flexibility, good mechanical properties and chemical corrosion resistance, is easy to fold, and makes the soft-pack battery last longer. In addition, the adhesive used is polyurethane adhesive, which matches the material of the edge seal 3, can provide a good bonding effect, and helps to solidify the connection to fix the edge seal 3 in the groove 2.

[0033] The embodiments described above are only preferred implementation modes of the present utility model and cannot be used to limit the protection scope of the present utility model. Any non-substantial changes and modifications made by technicians in this field on the basis of the utility model shall fall within the protection scope of the present utility model.

Claims

1. A soft-pack battery with a folded edge, comprising a main body (1), characterized in that: A pressing groove (2) and an edge seal (3) are provided on the side of the main body (1); the surface of the edge seal (3) and the pressing groove (2) are both provided with embossing; adhesive layers (4) are provided on both sides of the edge seal (3); the edge seal (3) is attached to the inside of the pressing groove (2) and is fixed to the inside of the pressing groove (2) through the adhesive layer (4).

2. A soft-pack battery with folded edges according to claim 1, characterized in that: The edge sealing (3) comprises an inner folding portion (31) and an outer folding portion (32); one side of the outer folding portion (32) is connected to the main body (1), and the other side of the outer folding portion (32) is connected to the inner folding portion (31); adhesive layers (4) are provided on both side surfaces of the inner folding portion (31); and an adhesive layer (4) is provided on the surface of the pressed groove (2).

3. The soft-pack battery with folded edge according to claim 2, characterized in that: The exposed surface of the outer folded portion (32) is flush with the exposed surface of the pressing groove (2).

4. The soft-pack battery with folded edge according to claim 2, characterized in that: The folded parts on both sides of the outer folding portion (32) are arc folded.

5. The soft-pack battery with folded edge according to claim 4, characterized in that: The cross section of the pressing groove (2) is C-shaped.

6. The soft-pack battery with folded edges according to claim 1, characterized in that: The surface material of the edge sealing (3) is polyurethane.

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