Vacuum liquid injection positioning clamp for soft package battery

Abstract

The utility model discloses a soft package battery vacuum liquid injection positioning clamp which comprises a base, a groove used for containing the side edge of a battery is formed in the middle of the base, at least two sets of supporting bodies are symmetrically arranged on the two sides of the groove, the supporting bodies are fixedly connected with the base, at least one spring assembly is arranged on one side of each supporting body, and the spring assemblies are fixedly connected with the base. The spring assemblies on the same group of supporting bodies provide pretightening force for the two sides of an aluminum-plastic film on the soft package battery respectively, the vacuum liquid injection positioning clamp for the soft package battery can keep certain pretightening force for the edge of the aluminum-plastic film, counteract external force generated by high vacuum, and control the opening of the air bag within a certain range, so that a battery cell is uniformly soaked in electrolyte, and the quality of the battery cell is improved. The permeation and absorption capabilities are improved, and the packaging yield is improved.

Description

Technical Field

[0001] This utility model relates to the field of vacuum liquid injection technology for soft-pack batteries, specifically a positioning fixture for vacuum liquid injection of soft-pack batteries. Background Technology

[0002] Soft-pack batteries require an electrolyte filling process. During normal filling, volatile organic compounds in the electrolyte can generate gas, affecting battery performance, self-discharge rate, and safety. To avoid this, vacuum filling is necessary. Vacuum filling not only removes gas from inside the battery but also reduces gas generation within the electrolyte, preventing bubble formation and ensuring battery safety and stability.

[0003] However, the higher the vacuum level, the greater the external force on the aluminum-plastic film, causing wrinkles at the bottom edges of the film. At the same time, excessively high vacuum levels can also cause deformation of the internal separator of the battery, preventing the electrolyte from evenly soaking the battery cell and affecting the packaging quality of the soft-pack battery. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the existing defects and provide a vacuum liquid injection positioning fixture for soft-pack batteries. It can maintain a certain pre-tightening force on the edges of the aluminum-plastic film to counteract the external force generated by the high vacuum, control the opening of the air bag within a certain range, so that the electrolyte can be evenly soaked in the battery cell, improve its penetration and absorption capacity, and improve the packaging yield. It can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a vacuum liquid injection positioning fixture for a soft-pack battery, comprising a base, a groove for placing the side of the battery is provided in the middle of the base, at least two sets of supports are symmetrically arranged on both sides of the groove, the supports are fixedly connected to the base, at least one spring assembly is provided on one side of the support, and the spring assemblies on the same set of supports provide pre-tightening force to both sides of the aluminum-plastic film on the soft-pack battery.

[0006] As a preferred embodiment of this utility model, the spring assembly includes a base plate, a top plate, a guide shaft, and a pressure spring. The base plate is connected to the support body, and the top plate is disposed opposite to the base plate. Four through holes are evenly distributed on the base plate, and four pressure springs are evenly distributed between the base plate and the top plate. One end of each pressure spring is fixedly connected to the top plate, and the other end of each pressure spring is fixed to the end face of the through hole. The pressure spring is sleeved on the outer side of the guide shaft, one end of which is fixedly connected to the top plate, and the other end of which passes through the through hole. The guide shaft and the through hole are sized to match.

[0007] As a preferred embodiment of this utility model, a miniature pressure sensor is installed on the base plate, the distance between the miniature pressure sensor and the top plate is 2mm, and the miniature pressure sensor is connected to a display screen.

[0008] As a preferred embodiment of this utility model, the support body has a plurality of pin holes evenly distributed along its height direction, and the base plate is fixed in the pin holes by positioning pins.

[0009] As a preferred embodiment of this utility model, the upper surface of the base is symmetrically provided with a plurality of elongated oval through holes along the center line of the groove, and the support body is connected to the base by bolts passing through the elongated oval through holes.

[0010] Compared with the prior art, the beneficial effects of this utility model are: (1) By setting multiple sets of spring assemblies on the base to apply pre-tightening force to the aluminum-plastic film of the soft-pack battery, the consistency of the liquid injection sealing effect is ensured, the size of the air bag side opening can be adjusted, the electrolyte flows evenly, and the cell penetration and absorption capacity is improved; (2) A micro pressure sensor is set on the spring assembly, and the pre-tightening force can be adjusted according to the requirements to keep the aluminum-plastic film in a consistent state under vacuum; (3) The number of elastic components can be adjusted according to the size of the soft-pack battery to ensure that the electrolyte is uniform in the up, down, left and right directions, and to increase the electrode wetting effect. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 A schematic diagram of the connection structure between the spring assembly and the support body;

[0013] Figure 3 This is a schematic diagram of the spring assembly.

[0014] In the figure: 1 base, 11 oblong through hole, 12 groove, 2 support body, 21 pin hole, 3 spring assembly, 31 bottom plate, 32 top plate, 33 guide shaft, 34 pressure spring, 35 miniature pressure sensor. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments (for ease of description and understanding, hereinafter referred to as...). Figure 1 (The above is described above). Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] Please see Figure 1-3This utility model provides a technical solution: a vacuum liquid injection positioning fixture for a soft-pack battery, including a base 1, which is fixed in the vacuum chamber of a vacuum liquid injection device. A groove 12 for placing the side of the battery is provided in the middle of the base 1. At least two sets of support bodies 2 are symmetrically arranged on both sides of the groove 12. In this embodiment, there are four support bodies 2, which are arranged in pairs on both sides of the groove 12. The support bodies 2 are fixedly connected to the base 1. At least one spring assembly 3 is provided on one side of the support body 2. In this embodiment, each support body 2 is provided with two spring assemblies 3.

[0017] The spring assembly 3 includes a base plate 31, a top plate 32, a guide shaft 33, and pressure springs 34. The base plate 31 is connected to the support body 2, and the top plate 32 is arranged opposite to the base plate 31. Four through holes are evenly distributed on the base plate 31. Four pressure springs 34 are evenly distributed between the base plate 31 and the top plate 32. One end of the pressure spring 34 is fixedly connected to the top plate 32, and the other end of the pressure spring 34 is fixed to the end face of the through hole. The pressure spring 34 is sleeved on the outer side of the guide shaft 33. One end of the guide shaft 33 is threadedly connected to the top plate 32, and the other end of the guide shaft 33 passes through the through hole. The guide shaft 33 and the through hole are matched in size. During vacuuming, the top plate 32 and the pressure springs 34 maintain a certain pre-tightening force on the edge of the aluminum-plastic film to counteract the external force generated by the high vacuum and control the opening of the air bag within a certain range, so that the electrolyte is evenly soaked in the battery cell.

[0018] The specifications of the compression spring 34 are as follows: outer diameter 8mm, compression amount 10mm, total height 25mm, wire diameter 1mm, and pitch 7mm.

[0019] To facilitate adjustment of the preload as needed and maintain a consistent state of the aluminum-plastic film under vacuum conditions, a miniature pressure sensor 35 is installed on the base plate 31. The distance between the miniature pressure sensor 35 and the top plate 32 is 2mm. The miniature pressure sensor 35 is connected to a display screen. The range of the miniature pressure sensor 35 is 0-500N. When compressed, the top plate 32 compresses the pressure spring 34, which in turn compresses the miniature pressure sensor 35, displaying the magnitude of the compression force.

[0020] To accommodate the positioning of soft-pack batteries of different sizes, the support body 2 has multiple pin holes 21 evenly distributed along its height direction. The base plate 31 is fixed in the pin holes 21 by positioning pins. The number of spring assemblies 3 fixed on the support body 2 can be selected as needed. The upper surface of the base 1 has multiple elongated through holes 11 symmetrically arranged along the center line of the groove 12. The support body 2 is connected to the base 1 by bolts passing through the elongated through holes 11. By adjusting the fixed position of the support body 2 on the base 1, the distance between the two top plates 32 can be changed.

[0021] In use: The support body 2 and the spring assembly 3 are assembled into a single unit and fixed together by a positioning pin. The pin hole 21 on the support body 2 can adjust the height of the spring assembly 3. When the size of the soft-pack battery is small, the length of the support body 2 can be changed.

[0022] During the vacuum injection process, the deformation of the aluminum-plastic film caused by the vacuum force is offset by the relatively arranged top plate 32, which straightens the aluminum-plastic film, ensures that the air bag side is vertical, and makes the electrolyte evenly soak the battery cell.

[0023] This invention can apply a pre-tightening force to the aluminum mold during the vacuum electrolyte injection process for soft-pack batteries of different sizes, ensuring a smooth surface of the aluminum mold, uniform electrolyte flow, and even immersion of the battery cell, thereby improving the quality of electrolyte injection.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vacuum liquid injection positioning fixture for a soft-pack battery, characterized in that: The device includes a base (1), with a groove (12) for placing the side of the battery in the middle. At least two sets of supports (2) are symmetrically arranged on both sides of the groove (12). The supports (2) are fixedly connected to the base (1). At least one spring assembly (3) is provided on one side of the support (2). The spring assemblies (3) on the same set of supports (2) provide pre-tightening force to both sides of the aluminum-plastic film on the soft pack battery.

2. The vacuum liquid injection positioning fixture for a soft-pack battery according to claim 1, characterized in that: The spring assembly (3) includes a base plate (31), a top plate (32), a guide shaft (33), and pressure springs (34). The base plate (31) is connected to the support body (2). The top plate (32) is arranged opposite to the base plate (31). The base plate (31) has four through holes evenly distributed. Four pressure springs (34) are evenly distributed between the base plate (31) and the top plate (32). One end of the pressure spring (34) is fixedly connected to the top plate (32), and the other end of the pressure spring (34) is fixed at the end face of the through hole. The pressure spring (34) is sleeved on the outer side of the guide shaft (33). One end of the guide shaft (33) is fixedly connected to the top plate (32), and the other end of the guide shaft (33) passes through the through hole. The guide shaft (33) matches the size of the through hole.

3. The vacuum liquid injection positioning fixture for a soft-pack battery according to claim 2, characterized in that: A miniature pressure sensor (35) is installed on the base plate (31). The distance between the miniature pressure sensor (35) and the top plate (32) is 2mm. The miniature pressure sensor (35) is connected to a display screen.

4. A vacuum liquid injection positioning fixture for a soft-pack battery according to claim 2, characterized in that: The support (2) has a plurality of pin holes (21) evenly distributed along its height direction, and the base plate (31) is fixed in the pin holes (21) by positioning pins.

5. A vacuum liquid injection positioning fixture for a soft-pack battery according to claim 1, characterized in that: The upper surface of the base (1) is symmetrically provided with a plurality of elongated through holes (11) along the center line of the groove (12), and the support (2) is connected to the base (1) by bolts passing through the elongated through holes (11).

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