Exhaust device of soft package battery

Abstract

The utility model relates to an exhaust device of a soft package battery. The exhaust device comprises a rack, an upper cavity mechanism fixed on the rack, and a lower cavity mechanism arranged under the upper cavity mechanism, the lower cavity mechanism is used for placing a soft package battery, and a lower sealing head is arranged at the top of the lower cavity mechanism; the upper cavity mechanism comprises an upper cavity covering cover capable of moving up and down in the height direction, the upper cavity covering cover is provided with a containing cavity with a downward opening, the upper cavity covering cover moves downwards and covers the top of the lower cavity mechanism, so that the containing cavity forms a sealed cavity, and the sealed cavity is communicated with a vacuumizing mechanism; an upper sealing head corresponding to the lower sealing head, a bayonet for forming a puncture opening in an air bag of the soft package battery and an extrusion part for extruding a battery body of the soft package battery are arranged in the accommodating cavity. The exhaust device of the soft package battery can quickly exhaust air in the soft package battery, so that the exhaust time consumption is reduced, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to soft package battery production and related supporting equipment technical field, especially a kind of exhaust device of soft package battery. BACKGROUND

[0002] Soft package battery production usually needs to be treated by formation, formation is the first charging of battery cell, purpose is to let electrode surface form stable SEI film, that is equivalent to a process of "activating" battery cell. After formation, battery interior is generated after electrochemistry, certain gas, therefore, soft package battery usually includes battery body and gas bag (as shown in Fig. Figure 1 For the gas generated after formation, the current process method is basically to pierce hole on the gas bag of soft package battery, then discharge gas by vacuum extraction.

[0003] However, in actual production, after piercing hole, the piercing hole distance battery body is far away on the gas bag of battery, and the piercing hole size is small, it is difficult to discharge air in soft package battery (especially the air in battery body far away from piercing hole) in short time, so that there is still air in battery body after heat sealing, which affects battery performance. INVENTION CONTENTS

[0004] Therefore, the utility model discloses the purpose in order to provide a kind of soft package battery exhaust device, it can quickly discharge the air in soft package battery, reduce exhaust time consumption, improve production efficiency.

[0005] A kind of exhaust device of soft package battery, including rack, the upper cavity mechanism of being fixed on rack, and the lower cavity mechanism being set at the upper cavity mechanism directly below;The lower cavity mechanism is used to place soft package battery, the top of the lower cavity mechanism is equipped with lower head;The upper cavity mechanism includes the upper cavity cover combined cover that can be moved up and down along the height direction, the upper cavity cover combined cover has the accommodating cavity with opening downwards, the upper cavity cover combined cover is moved downwards to cover in the lower cavity mechanism, so that the accommodating cavity forms sealed chamber, the sealed chamber is communicated with vacuum extraction mechanism;The accommodating cavity is equipped with the upper head corresponding with the lower head, and bayonet is used to form the puncture on the gas bag of the soft package battery, and it is also equipped with extrusion piece for extruding the battery body of the soft package battery.

[0006] The exhaust device of the utility model by setting extrusion piece for extruding battery body in upper cavity mechanism, after bayonet forms puncture on gas bag, accelerate the speed of gas in battery body from puncture discharge, reduce exhaust time consumption, improve production efficiency.

[0007] Further, the bayonet is set at the position adjacent to the extrusion piece.

[0008] Further, the bayonet is polygonal in cross section.

[0009] Further, the accommodating cavity is provided with an air bag pressing plate below the bayonet, the air bag pressing plate is provided with a bayonet through hole for the bayonet to pass through.

[0010] Further, the air bag pressing plate is elastically connected with the top wall of the accommodating cavity.

[0011] Further, the upper cavity mechanism comprises a pressing piece driving air cylinder arranged above the upper cavity cover, the output end of the pressing piece driving air cylinder penetrates the top of the upper cavity cover and is fixedly connected with the pressing piece, for driving the pressing piece to move up and down along the height direction.

[0012] Further, the upper cavity mechanism comprises a bayonet driving air cylinder arranged above the upper cavity cover, the output end of the bayonet driving air cylinder penetrates the top of the upper cavity cover and is fixedly connected with the upper head, for driving the upper head to move up and down along the height direction.

[0013] Further, the upper cavity mechanism comprises an upper head driving air cylinder arranged above the upper cavity cover, the output end of the upper head driving air cylinder penetrates the top of the upper cavity cover and is fixedly connected with the upper head, for driving the upper head to move up and down along the height direction.

[0014] Further, the upper cavity mechanism comprises an upper cavity fixing plate fixed on the rack and a lifting air cylinder installed on the upper cavity fixing plate, the output end of the lifting air cylinder is fixedly connected with the upper cavity cover, for driving the upper cavity cover to move up and down along the height direction.

[0015] Further, the exhaust device of the soft package battery further comprises a liquid storage tank, the lower cavity mechanism is provided with a waste liquid collecting port which can engage the bayonet at the position opposite to the bayonet, the waste liquid collecting port is in communication with the liquid storage tank, and the liquid storage tank is in communication with the vacuumizing mechanism.

[0016] In order to better understand and implement, the following will be described in detail in conjunction with the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of a soft package battery;

[0018] Figure 2 is a structural schematic view of an embodiment of an exhaust device of a soft package battery of the utility model;

[0019] Figure 3Structure schematic view (front view angle) of lower cavity mechanism of one embodiment of the soft package battery exhaust device of the utility model;

[0020] Figure 4 Structure schematic view (rear view angle) of lower cavity mechanism of one embodiment of the soft package battery exhaust device of the utility model;

[0021] Figure 5 Structure schematic view (front view angle) of upper cavity mechanism of one embodiment of the soft package battery exhaust device of the utility model;

[0022] Figure 6 Structure schematic view (rear view angle) of upper cavity mechanism of one embodiment of the soft package battery exhaust device of the utility model;

[0023] Figure 7 Structure schematic view (bottom view angle) of upper cavity mechanism of one embodiment of the soft package battery exhaust device of the utility model;

[0024] Figure 8 Local enlarged view (bottom view angle) of upper cavity mechanism structure A of one embodiment of the soft package battery exhaust device of the utility model;

[0025] Figure 9 Structure schematic view (top view angle) of tray assembly of lower cavity mechanism of another embodiment of the soft package battery exhaust device of the utility model;

[0026] Figure 10 Local enlarged view (top view angle) of waste liquid discharge port of lower cavity mechanism structure B of another embodiment of the soft package battery exhaust device of the utility model;

[0027] Figure 11 Local enlarged view (top view angle) of liquid discharge channel of lower cavity mechanism structure B of another embodiment of the soft package battery exhaust device of the utility model;

[0028] Reference signs:

[0029] 10, soft package battery; 10a, battery body of soft package battery; 10b, air bag of soft package battery; 10c, pole lug of soft package battery;

[0030] 3, exhaust device; 31, upper cavity mechanism; 310, upper cavity cover; 310a, accommodating cavity; 3100, bayonet; 3101, bayonet driving cylinder; 3102, extrusion piece; 3103, extrusion piece driving cylinder; 3104, upper head; 3105, upper head driving cylinder; 3106, air bag pressing plate; 3106a, bayonet through hole; 312, upper cavity fixing plate; 314, lifting cylinder; 316, connecting frame; 3160, upper cavity movable plate; 3162, upper cavity side plate; 3164, upper cavity mounting plate; 317, guide sleeve; 318, exhaust guide shaft; 32, lower cavity mechanism; 320, lower cavity base; 320a, sealing groove; 320b, waste liquid discharge port; 322, tray assembly; 3220, battery body tray; 3222, air bag tray; 3222a, waste liquid collection port; 3222b, waste liquid collection cavity; 3222c, annular collection groove; 324, lower head; 326, breather valve; 34, liquid storage tank. DETAILED DESCRIPTION

[0031] It should be noted that the embodiments described are merely part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the embodiments of the present application.

[0032] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0033] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on the other element or there can be a middle element. When an element is considered to be "connected" or "fixedly connected" to another element, it can be directly connected to the other element or there can be a middle element.

[0034] As shown in FIG. 1, the soft-pack battery 10 generally includes two parts of a battery body 10a and an air bag 10b. In order to exhaust the gas generated after formation, the soft-pack battery 10 needs to be exhausted. Figure 1 Figures 2-8 ​The figure shows the specific structure of an embodiment of the venting device for a soft-pack battery of the present invention. In this embodiment, the venting device 3 for a soft-pack battery comprises a frame (not shown), an upper cavity mechanism 31 fixed to the frame (not shown), and a lower cavity mechanism 32 disposed directly below the upper cavity mechanism 31. The upper cavity mechanism 31 is movable up and down along the height direction 31. When the upper cavity mechanism 31 moves downward, it covers the top of the lower cavity mechanism 32.

[0035] Specifically, if Figures 3-4 As shown, the lower cavity mechanism 32 includes a lower cavity base 320 and a tray assembly 322 arranged on the top of the lower cavity base 320. The lower cavity base 320 is specifically square or rectangular, and its top is provided with an annular sealing groove 320a extending in the circumferential direction for placing a sealing ring. The tray assembly 322 consists of two parts: a rectangular battery body tray 3220 and a rectangular airbag tray 3222. A long strip of lower head 324 is provided between the battery body tray 3220 and the airbag tray 3222. The lower head 324 is made of metal and is connected to a heating block.

[0036] like Figures 5-8 As shown, the upper cavity mechanism 31 includes an upper cavity fixing plate 312 fixed to a frame (not shown), a lifting cylinder 314 mounted on the upper cavity fixing plate 312, and an upper cavity cover 310 fixedly connected to the output end of the lifting cylinder 314. Here, the output end of the lifting cylinder 314 can be directly connected to the top of the upper cavity cover 310, or it can be indirectly connected through other components. In this embodiment, the output end of the lifting cylinder 314 is vertically downward in the height direction and is indirectly connected to the upper cavity cover 310 through a connecting frame 316. The connecting frame 316 specifically includes an upper cavity movable plate 3160, an upper cavity mounting plate 3164 located below the upper cavity movable plate 3160, and an upper cavity side plate 3162 located between the upper cavity movable plate 3160 and the upper cavity mounting plate 3164 and fixedly connected to the upper cavity movable plate 3160 and the upper cavity mounting plate 3164 respectively. Among them, the upper cavity mounting plate 3164 is fixed on the top of the upper cavity cover 310, and the output end of the lifting cylinder 314 is fixedly connected to the upper cavity movable plate 3160. When the lifting cylinder 314 is working, it drives the connecting frame 316 to drive the upper cavity cover to move up and down.

[0037] The upper cavity cover 310 is a square or rectangular body that matches the shape of the lower cavity base 320 and has a accommodating cavity 310a with an opening facing downward. When the lifting cylinder 314 drives the upper cavity cover 310 to move downward, the upper cavity cover 310 covers the lower cavity base 320, so that the accommodating cavity 310a forms a sealed chamber. In order to ensure that the upper cavity cover 310 accurately covers the lower cavity base 320, it can be as follows Figure 6As shown, four exhaust guide shafts 318 extending in the height direction are arranged at the four corner positions of the upper cavity fixing plate 312, the lower ends of the exhaust guide shafts 318 are fixedly connected with the top of the upper cavity cover 310, and a guide sleeve 317 slidingly matched with the exhaust guide shaft 318 is arranged on the upper cavity fixing plate 312, so as to ensure that the upper cavity movable plate 3160 does not displace when the lifting cylinder 314 drives the upper cavity movable plate 3160 to move downward. The sealing cavity is connected with a vacuum pumping mechanism (not shown in the figure), so as to pump the sealing cavity to be vacuumized, and the sealing cavity is also connected with a ventilation valve 326, which is in a closed state when vacuumizing, so as to form the sealing cavity; when the exhaust is completed, the ventilation valve 326 is opened, and air or other gas is introduced into the sealing cavity, so as to separate the upper cavity cover 310 from the lower cavity base 320. The accommodation cavity 310a is provided with an upper head 3104 corresponding to the lower head 324 and a bayonet 3100 located directly above the air bag bag tray 3222. The number of bayonets 3100 can be one, or multiple as Figures 7-8 As shown, a plurality of bayonets 3100 are arranged, and in this embodiment, the number of bayonets 3100 is 9, and they are arranged in a row along the length direction of the upper head 3104. Compared with the traditional piercing needle, the bayonet 3100 of the present embodiment has a larger cross-sectional area, which can form a larger piercing hole on the air bag bag 10b, which is beneficial to the rapid exhaust of gas. Specifically, the cross-sectional area of the bayonet 3100 is polygonal. The long strip-shaped upper head 3104 is made of metal and is connected with a heating block.

[0038] When the upper cavity mechanism 31 moves downward and forms a sealing cavity with the lower cavity mechanism 32, the vacuum pumping mechanism (not shown in the figure) is started to pump the sealing cavity to be vacuumized, the bayonet 3100 pierces the air bag bag 10b, and the air in the soft pack battery 10 is exhausted.

[0039] However, due to the limited strength of the vacuum pumping, in order to ensure that all the air in the soft pack battery 10 is exhausted, the time of vacuum pumping needs to be prolonged. In order to speed up the exhaust speed of the soft pack battery 10, the accommodation cavity 310a is also provided with an extrusion piece 3102 which can move up and down in the height direction. The extrusion piece 3102 is a square or rectangular plate structure, which is opposite to the battery body tray 3220. In order to realize the up and down movement of the extrusion piece 3102 in the height direction, the upper cavity mechanism 31 includes an extrusion piece driving cylinder 3103 arranged above the upper cavity cover 310, the output end of the extrusion piece driving cylinder 3103 penetrates the top of the upper cavity cover 310 downward and is fixedly connected with the extrusion piece 3102, so as to drive the extrusion piece 3102 to move up and down.

[0040] Before the exhaust device 3 works, the soft package battery 10 is placed on the top of the tray assembly 322, wherein the battery body 10a of the soft package battery 10 is above the battery body tray 3220, the air bag bag 10b is across the lower head 324 and above the air bag bag tray 3222, and then the upper head 3104 and the lower head 324 are preheated by the heating block. When the exhaust device 3 works, the upper cavity cover 310 is driven by the lifting cylinder 314 to move downward to the top of the lower cavity base 320, so that the accommodation cavity 310a of the upper cavity cover 310 forms a sealed chamber. Then, the sealed chamber is vacuumed by the vacuum mechanism (not shown in the figure). The bayonet 3100 pierces the air bag bag 10b in the process of moving the upper cavity cover 310 downward, forming a piercing hole; then, the extrusion piece driving cylinder 3103 drives the extrusion piece 3102 to extrude the battery body 10a, so that the gas in the battery body 10a is quickly discharged from the piercing hole, and the discharged air is sucked away by the vacuum mechanism (not shown in the figure). After the gas in the battery body 10a is completely discharged, the upper head 3104 cooperates with the lower head 324 to form a linear isolation seal between the piercing hole and the battery body 10b. In this way, the extrusion of the extrusion piece 3102 to the battery body 10a accelerates the discharge of the gas, shortens the exhaust time, and improves the production efficiency. After the exhaust is completed, air or other gas is introduced into the sealed chamber through the air valve 326, so that the upper cavity cover 310 and the lower cavity base 320 can be separated, and the next soft package battery 10 is prepared for exhaust treatment.

[0041] Further, as shown in Figure 7 Each bayonet 3100 is arranged adjacent to the extrusion piece 3102, so that the distance between the piercing hole formed by the bayonet 3100 in the air bag bag 10b and the battery body 10a can be shortened, and the gas discharge speed can be accelerated.

[0042] In order to ensure that the bayonet 3100 pierces the air bag 10b after the upper cavity cover 310 completely covers the lower cavity base 320, and to avoid the electrolyte flowing out everywhere, the upper cavity mechanism 31 of the above-mentioned exhaust device 3 further comprises a bayonet driving cylinder 3101 arranged on the upper cavity mounting plate 3164. Each bayonet 3100 arranged linearly in the accommodation cavity 310a is fixed to the bottom of a connecting block (not shown in the figure). The output end of the bayonet driving cylinder 3101 penetrates the top of the upper cavity cover 310 and is fixedly connected with the connecting block (not shown in the figure) to drive each bayonet 3100 to move downward simultaneously. When the upper cavity cover 310 covers the lower cavity base 320 to form a sealed cavity, each bayonet 3100 is driven by the bayonet driving cylinder 3101 to move downward simultaneously to pierce the air bag 10b. Then, the extrusion piece driving cylinder 3103 drives the extrusion piece 3102 to press the battery body 10a to accelerate the speed of gas exhaust. In this way, it can be ensured that the electrolyte will not overflow out of the sealed cavity. Here, the vacuum pumping mechanism (not shown in the figure) can start to pump the sealed cavity after the bayonet 3100 pierces the air bag 10b, or can pump the sealed cavity before the bayonet 3100 pierces the air bag 10b. In this embodiment, the sealed cavity is pumped first, and then the air bag 10b is pierced.

[0043] Preferably, the accommodation cavity 310a of the upper cavity cover 310 is further horizontally provided with an air bag pressing plate 3106. The air bag pressing plate 3106 is rectangular and located directly below the bayonet 3100. The air bag pressing plate 3106 is provided with a bayonet through hole 3106a corresponding to each bayonet 3100, which can be penetrated by the bayonet 3100. When the upper cavity cover 310 and the lower cavity base 320 form a sealed cavity, the air bag pressing plate 3106 abuts against the air bag 10b, the bayonet driving cylinder 3101 drives the bayonet 3100 to penetrate the bayonet through hole 3106a to pierce the air bag 10b, and then drives the bayonet 3100 to move upward and retreat into the bayonet through hole 3106a. In this way, the air bag pressing plate 3106 can facilitate the bayonet 3100 to pierce the air bag 10b smoothly through the abutting action on the air bag 10b. Preferably, the two ends of the air bag pressing plate 3106 along the length direction are elastically connected with the top wall of the accommodation cavity 310a by springs, so that the air bag pressing plate 3106 has a certain buffering elasticity in the height direction to adapt to air bags 10b of different volumes.

[0044] Further, the upper cavity mechanism 31 of the above-mentioned exhaust device 3 further comprises an upper head driving cylinder 3105 arranged on the upper cavity mounting plate 3164. The output end of the upper head driving cylinder 3105 penetrates the top of the upper cavity cover 310 and is fixedly connected with the upper head 3104 to drive the upper head 3104 to move downward. After the gas in the battery body 10b is completely exhausted, the upper head driving cylinder 3105 drives the upper head 3104 to move downward to press the air bag 10b against the lower head 324, and an isolated seal is formed on the air bag 10b.

[0045] During the operation of the exhaust device 3, part of the electrolyte will overflow from the puncture of the air bag 10b due to the extrusion of the extrusion piece 3102. In order to collect the overflowed electrolyte, the above-mentioned exhaust device further comprises a liquid storage tank 34 in communication with the lower cavity mechanism 32. As shown in Figures 9-11 The air bag tray 3222 is divided into upper and lower layers, the upper layer is provided with a waste liquid collection port 3222a which can engage the bayonet 3100, and the lower layer is provided with a waste liquid collection cavity 3222b which is in communication with each waste liquid collection port 3222a. The lower cavity base 320 is provided with a waste liquid discharge port 320b which is in communication with the waste liquid collection cavity 3222b, and a waste liquid collection channel is formed in the lower cavity mechanism 32 through the waste liquid collection port 3222a, the waste liquid collection cavity 3222b and the waste liquid discharge port 320b which are in communication with each other. The liquid inlet of the liquid storage tank 34 is in communication with the waste liquid discharge port 320b through a pipeline, and the air outlet of the liquid storage tank 34 is in communication with a vacuumizing mechanism (not shown in the figure). In this way, when the bayonet 3100 moves downward to puncture the upper surface and the lower surface of the air bag 10b, the gas and the electrolyte in the air bag 10b are discharged from the lower surface of the air bag 10b under the action of the air suction of the vacuumizing mechanism (not shown in the figure) and the gravity, and are collected into the liquid storage tank 34 through the waste liquid collection channel.

[0046] Further, the top of the air bag tray 3222 is further provided with an annular liquid discharge groove 3222c which is in communication with the waste liquid collection port 3222a, so as to collect the electrolyte which flows to the periphery of the air bag tray 3222 during the process of puncturing the air bag.

[0047] Compared with the prior art, the exhaust device of the utility model accelerates the speed of discharging the gas in the battery body from the puncture after the bayonet forms the puncture on the air bag, reduces the time consumption of exhaust, and improves the production efficiency through the arrangement of the extrusion piece which extrudes the battery body on the upper cavity mechanism. The structure is simple, economical and practical.

[0048] The above-described embodiments only express several implementation manners of the utility model, the description is more specific and detailed, but can not therefore be understood as the limitation of the utility model patent range. It should be pointed out that for ordinary skilled person in the art, without departing from the concept of the utility model, several modifications and improvements can be made, and the utility model also intends to include these changes and modifications.

Claims

1. A venting device for a soft-pack battery, characterized in that: The invention comprises a frame, an upper cavity mechanism (31) fixed on the frame, and a lower cavity mechanism (32) arranged directly below the upper cavity mechanism (31); the lower cavity mechanism (32) is used to place a soft-pack battery (10), and a lower sealing head (324) is provided on the top of the lower cavity mechanism (32); the upper cavity mechanism (31) comprises an upper cavity cover (310) movable up and down in a height direction, the upper cavity cover (310) having a accommodating cavity (310a) with an opening facing downward, the upper cavity cover (310) moves downward to cover the lower cavity mechanism (32), so that the accommodating cavity (310a) forms a sealed cavity, and the sealed cavity is connected to a vacuum pumping mechanism; The accommodating cavity (310a) is provided with an upper sealing head (3104) corresponding to the lower sealing head (324), a bayonet (3100) for forming a puncture hole on the airbag bag (10b) of the soft-pack battery (10), and an extrusion piece for extruding the battery body (10a) of the soft-pack battery (10).

2. The exhaust device for a soft pack battery according to claim 1, characterized in that: The bayonet (3100) is positioned adjacent to the extrusion member (3102).

3. The exhaust device for a soft pack battery according to claim 1, characterized in that: The cross section of the bayonet (3100) is polygonal.

4. The exhaust device for a soft pack battery according to claim 1, characterized in that: An air bag pressure plate (3106) is provided in the accommodating cavity (310a), and the air bag pressure plate is located directly below the bayonet (3100). A bayonet through hole (3106a) is provided on the air bag pressure plate for the bayonet (3100) to pass through.

5. The exhaust device for a soft pack battery according to claim 4, characterized in that: The airbag pressure plate (3106) is elastically connected to the top wall of the accommodating cavity (310a).

6. The exhaust device for a soft pack battery according to claim 1, characterized in that: The upper cavity mechanism (31) includes an extrusion member driving cylinder (3103) arranged above the upper cavity cover (310), and the output end of the extrusion member driving cylinder (3103) passes through the top of the upper cavity cover (310) and is fixedly connected to the extrusion member (3102), and is used to drive the extrusion member (3102) to move up and down along the height direction.

7. The exhaust device for a soft pack battery according to claim 1, characterized in that: The upper cavity mechanism (31) includes a bayonet drive cylinder (3101) arranged above the upper cavity cover (310), and the output end of the bayonet drive cylinder (3101) passes through the top of the upper cavity cover (310) and is fixedly connected to the upper head (3104), and is used to drive the upper head (3104) to move up and down along the height direction.

8. The exhaust device for a soft pack battery according to claim 1, characterized in that: The upper cavity mechanism (31) includes an upper head driving cylinder (3105) arranged above the upper cavity cover (310), and the output end of the upper head driving cylinder (3105) passes through the top of the upper cavity cover (310) and is fixedly connected to the upper head (3104), and is used to drive the upper head (3104) to move up and down in the height direction.

9. The exhaust device for a soft pack battery according to claim 1, characterized in that: The upper cavity mechanism (31) comprises an upper cavity fixing plate fixed on the frame, and a lifting cylinder (314) installed on the upper cavity fixing plate (312); an output end of the lifting cylinder (314) is fixedly connected to the upper cavity covering cover (310) and is used to drive the upper cavity covering cover (310) to move up and down in a height direction.

10. The exhaust device for a soft pack battery according to any one of claims 1 to 9, characterized in that: It also includes a liquid storage tank (34), and the lower cavity mechanism (32) is provided with a waste liquid collection port (3222a) that can be engaged with the bayonet (3100) at a position opposite to the bayonet (3100), the waste liquid collection port (3222a) is connected to the liquid storage tank (34), and the liquid storage tank (34) is connected to the vacuum mechanism.

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