Exhaust device for formation process of soft package battery

Abstract

The utility model discloses an exhaust device for a formation process of a soft package battery, the soft package battery comprises a sealing bag formed by an aluminum plastic film, and the exhaust device comprises a fixed pipe arranged at the edge of the sealing bag and used for communicating the internal space of the sealing bag with the outside; the exhaust pipe is connected with the fixed pipe and is positioned outside the sealing bag; the one-way valve is connected with the exhaust pipe, allows the gas to be exhausted from the sealing bag and limits the gas from entering the sealing bag. The flexible package battery is compatible with the existing flexible package battery process, the packaging operation is simple, the use of an aluminum plastic film is reduced, and the production cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of soft-pack battery technology, specifically relating to an exhaust device for the formation process of soft-pack batteries. Background Art

[0002] Soft-pack lithium batteries generally refer to lithium batteries with an aluminum-plastic composite film encapsulation. They have advantages such as light weight, lower mold costs, and high safety. During the production of soft-pack lithium batteries, gas is generated during the formation stage. Therefore, the venting problem is generally solved by a double-sealing method. The first sealing leaves space to store the gas generated during formation. After formation is complete, a second sealing is performed to seal the battery. Excess gas is stored within the sealed area formed by the two sealing processes. The sealed area is then cut off to separate the gas from the battery.

[0003] This production method requires a significant amount of aluminum-plastic film, especially in the production of large pouch batteries, where more film material is needed to contain the generated gases. Given the high price of aluminum-plastic film, reducing its usage during the formation stage has become a common goal in the industry. Utility Model Content

[0004] To address the aforementioned technical problems, the purpose of this utility model is to provide an exhaust device for the formation process of pouch batteries, which is compatible with existing pouch battery processes, simplifies the encapsulation operation, and helps reduce the use of aluminum-plastic film, thereby lowering production costs.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0006] A venting device for the formation process of a pouch cell, the pouch cell comprising a sealed package formed of an aluminum-plastic film, characterized in that the venting device comprises:

[0007] A fixed tube is located at the edge of the sealing package and communicates with the internal space of the sealing package;

[0008] The exhaust pipe, connected to the fixed pipe, is located outside the sealed enclosure;

[0009] A one-way valve, connected to the exhaust pipe, allows gas to escape from the sealed package while restricting gas from entering the sealed package.

[0010] Preferably, the side of the fixing tube is provided with an electrode tab adhesive layer.

[0011] Preferably, both the fixing pipe and the exhaust pipe are made of plastic.

[0012] More preferably, the fixing tube is a high-temperature resistant plastic part.

[0013] Preferably, the one-way valve is a plastic component.

[0014] Preferably, the exhaust pipe is a rigid pipe or a flexible pipe.

[0015] Preferably, the fixed pipe is fixedly connected to the exhaust pipe, and the exhaust pipe is fixedly connected to the one-way valve.

[0016] Preferably, the fixed pipe is fixedly connected to the exhaust pipe, and the exhaust pipe is detachably connected to the one-way valve.

[0017] Preferably, the exhaust pipe includes a front exhaust pipe and a rear exhaust pipe, wherein the front exhaust pipe is fixedly connected to the fixed pipe, and the end of the front exhaust pipe away from the fixed pipe is sealed; the rear exhaust pipe is connected to the one-way valve, and an exhaust needle is provided at the end of the rear exhaust pipe away from the one-way valve; the rear exhaust pipe achieves communication between the front exhaust pipe and the rear exhaust pipe by inserting the exhaust needle into the front exhaust pipe.

[0018] More preferably, the end of the front exhaust pipe away from the fixed pipe is recessed inward to form a mating groove, and the end of the rear exhaust pipe away from the one-way valve is interference-fitted with the mating groove of the front exhaust pipe, so that the front exhaust pipe and the rear exhaust pipe are tightly connected.

[0019] Beneficial effects:

[0020] This invention is applicable to existing chemical formation processes. It simply adds an exhaust device to the sealed package formed by the aluminum-plastic film and connects a one-way valve to a negative pressure device. The gas generated during the chemical formation process is discharged through the one-way valve along the fixed pipe and the exhaust pipe. Therefore, the area inside the sealed package used to retain gas can be greatly reduced, thereby reducing the amount of aluminum-plastic film used and lowering production costs. Attached Figure Description

[0021] Figure 1 The diagram shown is a schematic diagram of the use of this utility model;

[0022] Figure 2 The diagram shown is a schematic representation of one embodiment of this utility model;

[0023] Figure 3 The diagram shown is a schematic diagram of another embodiment of this utility model.

[0024] Attached reference numerals: 1-exhaust device, 2-battery, 3-aluminum-plastic film, 4-sealing package, 5-tab, 6-gas storage space;

[0025] 11-Fixed tube, 12-Exhaust pipe, 13-One-way valve, 14-Electrical tab adhesive layer, 15-Front exhaust pipe, 16-Rear exhaust pipe, 17-Exhaust needle, 18-Matching groove. DETAILED DESCRIPTION

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0027] like Figure 1 As shown. This utility model proposes an exhaust device for the formation process of pouch batteries. The pouch battery includes a sealed package 4 formed by an aluminum-plastic film 3. Specifically, the exhaust device 1 includes the following structure:

[0028] The fixing tube 11 is located at the edge of the sealing package 4, connecting the internal space of the sealing package 4 with the outside world;

[0029] The exhaust pipe 12 is connected to the fixed pipe 11 and is located outside the sealing package 4;

[0030] One-way valve 13, connected to exhaust pipe 12, allows gas to be discharged from sealed package 4 and restricts gas from entering sealed package 4.

[0031] The function of the fixing tube 11 is to discharge the gas inside the sealing package 4, while the one-way valve 13 maintains the sealed state of the sealing package 4. It is easy to understand that after the aluminum-plastic film 3 is sealed, the components of battery 2 need to be completely isolated from the outside world, especially during the formation process, to prevent contact between the components of battery 2 and the atmosphere. In this invention, the fixing tube 11 is fixedly connected to the aluminum-plastic film 3 during the normal heat sealing process, that is, the fixing tube 11 and the sealing surface form an integral whole.

[0032] Specifically, the sealing package 4 is formed as follows: the battery 2 is placed on the aluminum-plastic film 3, one side of the aluminum-plastic film 3 is folded up to cover the battery 2, and the two layers of aluminum-plastic film 3 are heat-sealed along the edge, that is, along... Figure 1 The aluminum-plastic film 3 is heat-sealed at the middle, side, and top seal positions, thereby forming a sealed space between the two layers of aluminum-plastic film 3. During heat sealing, the tabs 5 are placed at the edges of the two layers of aluminum-plastic film 3 and heat-sealed together; this is the first sealing or heat sealing. Since the heat sealing of the aluminum-plastic film 3 and the setting of the tabs 5 are common steps in existing soft-pack lithium batteries 2, this utility model will not elaborate further. In the prior art, this sealed space contains battery components such as the positive electrode, negative electrode, separator, electrolyte, etc., and also reserves a gas storage space 6. After formation is completed, a second sealing is performed at the middle position of the sealed package, that is, along... Figure 1 The aluminum-plastic film 3 is heat-sealed at the middle sealing position, separating the space for storing the battery 2 from the gas storage space 6. The sealed package 4 corresponding to the gas storage space 6 is cut off, and the remaining sealed package 4 is the soft-pack lithium battery 2.

[0033] The fixed tube 11 of this utility model is set at the edge of the gas storage space 6 to connect the gas storage space 6 to the outside.

[0034] It should be noted that the "connection to the outside world" mentioned in this utility model does not mean that the sealing package 4 is not in a sealed state, but rather that the fixed tube 11 has a connecting function. It is easy to understand that the sealing package 4 is still in a sealed state before formation.

[0035] This invention is applicable to existing chemical formation processes, and only adds an exhaust device 1 to the sealed package 4 formed by the aluminum-plastic film 3. By connecting the one-way valve 13 to a conventional negative pressure device, the gas generated during the chemical formation process is discharged through the one-way valve 13 along the fixed pipe 11 and the exhaust pipe 12. Therefore, the area inside the sealed package 4 used to retain gas can be significantly reduced, thereby reducing the amount of aluminum-plastic film 3 used and lowering production costs.

[0036] Furthermore, the side of the fixing tube 11 is provided with an electrode tab adhesive layer 14, which is fixedly connected to the aluminum-plastic film 3 during heat sealing.

[0037] To reduce the cost of the exhaust device 1, both the fixing tube 11 and the exhaust tube 12 are made of plastic. Furthermore, the one-way valve 13 is also made of plastic; for example, the one-way valve 13 can be an existing medical one-way valve 13. Furthermore, the fixing tube 11 is made of high-temperature resistant plastic; for example, the fixing tube 11 is a plastic component capable of withstanding temperatures of 100°C and above, to prevent deformation during the heat-sealing process.

[0038] In this invention, the exhaust pipe 12 can be a rigid pipe or a flexible pipe. Preferably, the exhaust pipe 12 is a flexible pipe.

[0039] The fixed pipe 11 and the exhaust pipe 12 can be integrally formed or they can be two different pipes. This invention does not limit the diameter of the fixed pipe and the exhaust pipe. The exhaust device 1 of this invention can be an integral structure, that is, the fixed pipe 11 and the exhaust pipe 12 are fixedly connected, and the exhaust pipe 12 and the one-way valve 13 are fixedly connected. After the aluminum-plastic film 3 is heat-sealed to form a sealed package 4, the integral exhaust device 1 and the sealed package 4 form a whole. Due to the action of the one-way valve 13, the sealed package 4 connected to the fixed pipe 11 can still maintain a sealed state. Before formation, the one-way valve 13 restricts outside air from entering the sealed package 4. During the formation process, under negative pressure, the gas inside the sealed package 4 is discharged. After formation, the one-way valve 13 is separated from the negative pressure equipment, allowing the sealed package 4 to re-seal. The sealed package 4, along with the fixed pipe 11, the exhaust pipe 12, and the one-way valve 13, are treated as a whole and proceed to subsequent processing for a second sealing.

[0040] The exhaust device 1 of this utility model can also be a split structure. The split structure of the exhaust device 1 includes, but is not limited to, the following two structures:

[0041] Structure 1: such as Figure 2 As shown, the fixed pipe 11 is fixedly connected to the exhaust pipe 12, and the exhaust pipe 12 is detachably connected to the one-way valve 13. For example, the end of the exhaust pipe 12 is interference-fitted with the one-way valve 13, or the end of the exhaust pipe 12 is threadedly connected to the one-way valve 13. The exhaust pipe 12 is made of plastic flexible tubing.

[0042] During the heat sealing of the aluminum-plastic film 3, the fixing tube 11 and the sealing package 4 form a whole, and the exhaust pipe 12 is connected to the one-way valve 13 to keep the sealing package 4 in a sealed state. After the formation is completed, the middle part of the exhaust pipe 12 is heat sealed to form a seal at the part where the exhaust pipe 12 is connected to the fixing tube 11. Then the exhaust pipe 12 is separated from the one-way valve 13. The sealing package 4, the fixing tube 11, and the exhaust pipe 12 are still in a sealed state. The subsequent process is carried out for a second sealing, and the one-way valve 13 is recycled for reuse.

[0043] Structure 2: such as Figure 3 As shown, the exhaust pipe 12 includes a front exhaust pipe 15 and a rear exhaust pipe 16. The front exhaust pipe 15 is fixedly connected to the fixed pipe 11, and the end of the front exhaust pipe 15 away from the fixed pipe 11 is sealed. The rear exhaust pipe 16 is connected to the one-way valve 13, and an exhaust needle 17 is provided at the end of the rear exhaust pipe 16 away from the one-way valve 13. The rear exhaust pipe 16 connects the front exhaust pipe 15 and the rear exhaust pipe 16 by inserting the exhaust needle 17 into the front exhaust pipe 15.

[0044] During the heat sealing of the aluminum-plastic film 3, the fixing tube 11, the front exhaust pipe 15, and the sealing package 4 form a whole, keeping the sealing package 4 in a sealed state. Before formation, the exhaust needle 17 of the rear exhaust pipe 16 is inserted into the front exhaust pipe 15, connecting the fixing tube 11, the front exhaust pipe 15, and the rear exhaust pipe 16. Then, formation begins, venting the gas generated inside the sealing package 4. After formation is completed, the front exhaust pipe 15 is heat-sealed at the front end of the exhaust needle 17, isolating the space of the sealing package 4 from the exhaust needle 17, allowing the sealing package 4 to re-seal. Then, the exhaust needle 17 is pulled out from the end of the front exhaust pipe 15. The fixing tube 11 and the front exhaust pipe 15 follow the sealing package 4 into subsequent processing steps. The rear exhaust pipe 16 and the one-way valve 13 can maintain connection with the negative pressure equipment and be reused multiple times.

[0045] Furthermore, in the second structural design, the end of the front exhaust pipe 15 furthest from the fixed pipe 11 is recessed inward to form a mating groove 18. The end of the rear exhaust pipe 16 furthest from the one-way valve 13 is press-fitted with the mating groove 18 of the front exhaust pipe 15, ensuring a tight connection between the front exhaust pipe 15 and the rear exhaust pipe 16. It is easy to understand that the exhaust needle 17 is made of metal, and one end of the exhaust needle 17 on the rear exhaust pipe 16 is a rigid part, facilitating the press-fit connection with the mating groove 18.

[0046] The embodiments provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The descriptions of the embodiments above are only for the purpose of helping to understand the core ideas of this utility model. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principles of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. An exhaust device for a pouch battery formation process, the pouch battery comprising a sealed package (4) formed of an aluminum-plastic film (3), the sealed package (4) having a gas storage space (6), wherein after formation is completed, a second sealing is performed at the middle position of the sealed package to separate the space storing the battery (2) from the gas storage space (6), and the portion of the sealed package (4) corresponding to the gas storage space (6) is cut off, characterized in that, The exhaust device includes: A fixed tube (11) is provided at the edge of the gas storage space (6) and communicates with the gas storage space (6). The side of the fixed tube (11) is provided with an electrode adhesive layer (14). The exhaust pipe (12) is connected to the fixed pipe (11) and is located outside the sealed package (4); A one-way valve (13) is connected to the exhaust pipe (12) to allow gas to be discharged from the sealed package (4) and to restrict gas from entering the sealed package (4); Both the fixing pipe (11) and the exhaust pipe (12) are made of plastic.

2. The exhaust device for the formation process of pouch batteries according to claim 1, characterized in that, The fixing tube (11) is a high-temperature resistant plastic part.

3. The exhaust device for the formation process of pouch batteries according to claim 1, characterized in that, The one-way valve (13) is made of plastic.

4. The exhaust device for the formation process of pouch batteries according to claim 1, characterized in that, The exhaust pipe (12) is either a rigid pipe or a flexible pipe.

5. The venting device for the formation process of pouch batteries according to any one of claims 1-4, characterized in that, The fixed pipe (11) is fixedly connected to the exhaust pipe (12), and the exhaust pipe (12) is fixedly connected to the one-way valve (13).

6. The venting device for the formation process of pouch cells according to any one of claims 1-4, characterized in that, The fixed pipe (11) is fixedly connected to the exhaust pipe (12), and the exhaust pipe (12) is detachably connected to the one-way valve (13).

7. The venting device for the formation process of pouch cells according to any one of claims 1-4, characterized in that, The exhaust pipe (12) includes a front exhaust pipe (15) and a rear exhaust pipe (16). The front exhaust pipe (15) is fixedly connected to the fixed pipe (11). The end of the front exhaust pipe (15) away from the fixed pipe (11) is sealed. The rear exhaust pipe (16) is connected to the one-way valve (13). An exhaust needle (17) is provided at the end of the rear exhaust pipe (16) away from the one-way valve (13). The rear exhaust pipe (16) connects the front exhaust pipe (15) and the rear exhaust pipe (16) by inserting the exhaust needle (17) into the front exhaust pipe (15).

8. The venting device for the formation process of pouch batteries according to claim 7, characterized in that, The end of the front exhaust pipe (15) away from the fixed pipe (11) is recessed inward to form a mating groove (18), and the end of the rear exhaust pipe (16) away from the one-way valve (13) is press-fitted with the mating groove (18) of the front exhaust pipe (15) so that the front exhaust pipe (15) and the rear exhaust pipe (16) are tightly connected.

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