Soft package lithium battery exhaust device

Abstract

The utility model relates to the technical field of lithium battery exhaust, in particular to a soft package lithium battery exhaust device which comprises a processing table and a support at the top of the processing table, a battery cell main body is fixed on the support through a clamping device, and a battery cell air bag is connected above the battery cell main body. Wherein an exhaust mechanism is arranged at the top of the processing table through a driving assembly, and the driving assembly is matched with the exhaust mechanism for use and is used for pressing gas in the battery cell main body into the battery cell gas bag and driving the vertical mounting frame and the transverse mounting frame; the surface of the battery cell main body is extruded by utilizing the compression rollers in the pair of mounting frames, so that the effect of pressing gas into the battery cell gas bag is achieved, and the soft package lithium batteries with different specifications can be subjected to exhaust operation within a certain range; the problem that lithium is separated out due to the fact that gas in the battery cannot be exhausted completely due to design defects in an existing rolling technology is effectively solved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery exhaust, in particular to a soft-pack lithium battery exhaust device. Background Art

[0002] During the pre-charge formation of the SEI film in soft-pack lithium-ion batteries, the electrode material inside the battery reacts with the electrolyte at the solid-liquid interface to form a solid electrolyte interface (SEI) film on the surface of the negative electrode. The electrochemical reaction produces gas. After each charge, the battery needs to be rolled to drive the gas into the air bag to prevent it from staying in the battery body and affecting the formation of the SEI film.

[0003] In order to prevent the presence of gas from affecting the uniformity and integrity of the SEI film, a soft-pack lithium battery exhaust device is proposed, such as the prior art Chinese patent announcement number "

[0004] CN114335745A" discloses a soft-pack lithium battery exhaust process, which specifically includes the following steps:

[0005] Step 1: After placing the lithium battery into the exhaust box, close the exhaust box and pierce the top of the lithium battery at the same time; the present invention relates to the field of lithium battery processing technology. This soft-pack lithium battery exhaust process applies pressure to the lithium battery for exhaust by pressurization and rolling at the same time, which can more evenly and thoroughly exhaust the excess gas inside it. By setting up a piston assembly and using air pressure to lift it up, the rolling structure can be automatically pulled up to achieve the rolling effect without the need for an additional electric structure. At the same time, the double piston structure of the piston block and piston plate set inside the piston assembly can also use the hollow puncture assembly to extract the gas inside the lithium battery when pressurized, without the need for a separate connection. Even after the lithium battery is removed, when the piston block and piston plate automatically reset, the extracted gas can be discharged and collected. It has three functions in one, a compact structure, a small size, and is easy to control.

[0006] In specific operations, a similar method is to extract the gas in the lithium battery and collect the gas through a hollow puncture component, but some soft-pack lithium batteries use a method in which the battery cell body and the battery cell air bag are integrally formed, and thus a similar exhaust method is not applicable to this type of soft-pack lithium battery. Utility Model Content

[0007] The purpose of the utility model is to solve the shortcomings of the prior art that the soft-pack lithium battery is not suitable for the battery body and the battery air bag being integrally formed, and to propose a soft-pack lithium battery exhaust device.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A soft-pack lithium battery exhaust device is designed, comprising a processing table and a bracket on top of the processing table, a battery cell body is fixed on the bracket by a clamping device, and a battery cell air bag is connected above the battery cell body;

[0010] Among them, an exhaust mechanism is provided on the top of the processing table through a driving component, and the driving component is used in conjunction with the exhaust mechanism to press the gas in the battery cell body into the battery cell air bag.

[0011] Furthermore, the exhaust mechanism includes a vertical mounting frame and a horizontal mounting frame. Both the vertical mounting frame and the horizontal mounting frame are slidably connected to the top of the processing table through a slide and are arranged on both sides of the battery cell body.

[0012] Furthermore, a slide is slidably connected to the vertical mounting frame and the horizontal mounting frame, and pressure rollers are rotatably connected to both ends of the slide through a fixed seat. The vertically and horizontally arranged pressure rollers can respectively cover the battery cell body in the corresponding directions.

[0013] Furthermore, the exhaust mechanism also includes a pushing cylinder and a lifting cylinder. The pushing cylinder is fixed to the sides of the vertical mounting frame and the horizontal mounting frame, and the shaft end of the pushing cylinder is fixedly connected to the slide.

[0014] Furthermore, the bottom of the transverse mounting frame is slidably connected to a support plate via a guide rod, the support plate is fixedly connected to the slide seat, and the lifting cylinder is fixedly installed on its bottom, and the shaft end of the lifting cylinder is fixedly connected to the transverse mounting frame.

[0015] Furthermore, the driving components on both sides are arranged relative to each other and have the same structure.

[0016] The utility model proposes a soft-pack lithium battery exhaust device, which has the beneficial effects of: the utility model can drive the vertical mounting frame and the horizontal mounting frame respectively by setting a driving component, and then use a pair of pressure rollers in the mounting frame to squeeze the surface of the battery body to achieve the effect of pressing the gas into the battery air bag, and can also perform exhaust operations on soft-pack lithium batteries of different specifications within a certain range, effectively solving the problem of incomplete exhaust of internal gas of the battery and thus lithium precipitation due to design defects of the existing rolling technology, improving product quality, ensuring the cycle performance and service life of the battery, and having a simple structure and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the utility model;

[0018] Figure 2 for Figure 1 Schematic diagram of the enlarged structure of area A;

[0019] Figure 3 It is a cross-sectional view of the pressing roller of the utility model.

[0020] In the figure: 1. Processing table; 2. Bracket; 3. Clamping device; 4. Battery cell body; 41. Battery cell air bag; 5. Drive assembly; 6. Exhaust mechanism; 61. Vertical mounting frame; 62. Horizontal mounting frame; 621. Guide rod; 63. Slide plate; 64. Pressure roller; 65. Push cylinder; 66. Lifting cylinder; 67. Support plate; 7. Slide seat. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] Reference Figure 1-3 A soft-pack lithium battery exhaust device includes a processing table 1 and a bracket 2 on the top of the processing table 1, a battery body 4 is fixed on the bracket 2 by a clamping device 3, and a battery air bag 41 is connected to the top of the battery body 4;

[0023] Among them, an exhaust mechanism 6 is provided on the top of the processing table 1 through a driving component 5 , and the driving component 5 is used in conjunction with the exhaust mechanism 6 to press the gas in the battery cell body 4 into the battery cell air bag 41 .

[0024] It should be added that the driving assembly 5 includes synchronous wheels rotating on both sides of the top of the processing table 1, a corresponding pair of synchronous wheels is provided with a synchronous belt, and also includes a motor, which is fixedly connected to one of the synchronous wheels through a fixed seat;

[0025] Among them, the slide 7 is provided with a pair, which is used to support the vertical mounting frame 61 and the horizontal mounting frame 62 respectively. The pair of slides 7 are respectively fixed to the side edges of the synchronous belt on both sides, so that the driving component 5 on one side only drives one slide 7, that is, the horizontally and vertically arranged pressure rollers 64 do not move at the same time to avoid jamming.

[0026] Furthermore, the exhaust mechanism 6 includes a vertical mounting frame 61 and a horizontal mounting frame 62 . Both the vertical mounting frame 61 and the horizontal mounting frame 62 are slidably connected to the top of the processing table 1 through a slide 7 and are arranged on both sides of the battery cell body 4 .

[0027] Furthermore, a slide 63 is slidably connected to the vertical mounting frame 61 and the horizontal mounting frame 62, and pressure rollers 64 are rotatably connected to both ends of the slide 63 through a fixed seat. The vertically and horizontally arranged pressure rollers 64 can respectively cover the battery cell body 4 in the corresponding directions.

[0028] In more detail, the exhaust mechanism 6 also includes a pushing cylinder 65 and a lifting cylinder 66. The pushing cylinder 65 is fixed to the sides of the vertical mounting frame 61 and the horizontal mounting frame 62. The axial end of the pushing cylinder 65 is fixedly connected to the slide 63.

[0029] In general, the bottom of the transverse mounting frame 62 is slidably connected to a support plate 67 through a guide rod 621. The support plate 67 is fixedly connected to the slide 7, and the bottom of the support plate 67 is fixedly installed with the lifting cylinder 66. The axial end of the lifting cylinder 66 is fixedly connected to the transverse mounting frame 62.

[0030] Finally, the driving components 5 on both sides are arranged relative to each other and have the same structure.

[0031] Working mode: When working, the vertical pressing roller 64 moves in the following manner: starting from the middle of the battery, the pressing roller 64 moves to the middle of the battery cell and moves forward to the battery body, maintaining a certain gap with the surface of the battery cell body, first moving toward the negative electrode side and rolling to the negative electrode head, then rolling from the negative electrode head to the positive electrode head, and finally rolling from the positive electrode head to the negative electrode head again. When the rolling action is completed, the vertical pressing roller 64 returns to the starting point;

[0032] The horizontal pressing roller 64 moves in the following manner: after the vertical pressing roller 64 finishes its work and returns to the origin, the horizontal pressing roller 64 moves forward and rightward until it is parallel to the battery body and can cover the length of the battery body; starting from the bottom of the battery, the horizontal pressing roller 64 is pressed against the battery body, maintaining a certain gap, and the battery moves toward the air bag side to the edge of the upper body and stops, then moves back and descends to the bottom of the battery, repeating this rolling method three times, and returning to the origin after the action is completed;

[0033] After the rolling operation is completed, the two pressing rollers 64 return to their original positions and the battery cells are unloaded.

[0034] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A soft-pack lithium battery exhaust device, comprising a processing table (1) and a bracket (2) on the top of the processing table (1), characterized in that: A battery cell body (4) is fixed to the bracket (2) via a clamping device (3), and a battery cell air bag (41) is connected above the battery cell body (4); The top of the processing table (1) is provided with an exhaust mechanism (6) via a drive assembly (5), and the drive assembly (5) and the exhaust mechanism (6) are used in conjunction with each other to press the gas in the battery cell body (4) into the battery cell air bag (41).

2. The venting device for a soft-pack lithium battery according to claim 1, characterized in that: The exhaust mechanism (6) comprises a vertical mounting frame (61) and a horizontal mounting frame (62); the vertical mounting frame (61) and the horizontal mounting frame (62) are both slidably connected to the top of the processing table (1) via a slide seat (7) and are arranged on both sides of the battery cell body (4).

3. The venting device for a soft-pack lithium battery according to claim 2, characterized in that: A slide plate (63) is slidably connected to the vertical mounting frame (61) and the horizontal mounting frame (62), and pressure rollers (64) are rotatably connected to both ends of the slide plate (63) via fixed seats. The vertically and horizontally arranged pressure rollers (64) can respectively cover the battery cell body (4) in the corresponding directions.

4. The venting device for a soft-pack lithium battery according to claim 3, characterized in that: The exhaust mechanism (6) further comprises a pushing cylinder (65) and a lifting cylinder (66). The pushing cylinder (65) is fixed to the side surfaces of the vertical mounting frame (61) and the horizontal mounting frame (62). The shaft end of the pushing cylinder (65) is fixedly connected to the slide plate (63).

5. The venting device for a soft-pack lithium battery according to claim 4, characterized in that: The bottom of the transverse mounting frame (62) is slidably connected to a support plate (67) via a guide rod (621); the support plate (67) is fixedly connected to the slide seat (7); and the bottom of the support plate (67) is fixedly mounted with the lifting cylinder (66); the shaft end of the lifting cylinder (66) is fixedly connected to the transverse mounting frame (62).

6. The venting device for a soft-pack lithium battery according to claim 1, characterized in that: The driving components (5) on both sides are arranged relative to each other and have the same structure.

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