A production line for secondary packaging of soft-pack batteries

Abstract

This invention relates to a pouch battery secondary packaging production line, comprising a loading platform for placing pouch batteries to be vented, a venting device disposed downstream of the loading platform along a first direction, and a loading device; the venting device includes 2n venting units symmetrically arranged about the first direction; each venting unit includes an upper cavity mechanism and a lower cavity mechanism disposed directly below the upper cavity mechanism; the lower cavity mechanism is movable from a first position directly below the upper cavity mechanism to a second position along a second direction; when the lower cavity mechanism moves from the first position to the second position, the loading device moves the pouch batteries to be vented located on the loading platform to the lower cavity mechanism, and then the lower cavity mechanism moves from the second position to the first position; and / or, the loading device removes the vented pouch batteries located in the lower cavity mechanism, and then the lower cavity mechanism moves from the second position to the first position. This invention can improve the loading efficiency of pouch batteries and reduce the space occupied by the equipment.

Description

Technical Field

[0001] This invention relates to the field of soft-pack battery production and related supporting equipment technology, and in particular to a soft-pack battery secondary packaging production line. Background Technology

[0002] Pouch batteries are widely used in electric vehicles, electric bicycles, and smart clamps due to their advantages such as small size, light weight, high safety, and flexible design. The production process of pouch batteries includes multiple steps such as degassing, edge trimming, edge folding, and edge heating. To automate the secondary packaging of pouch batteries, secondary packaging production lines have emerged on the market, consisting of feeding devices, venting devices, edge trimming devices, edge folding devices, edge heating devices, and unloading devices. To simultaneously degas multiple pouch batteries, the venting devices in existing pouch battery secondary packaging production lines typically include multiple degassing units. However, the layout of degassing units in existing production lines is mostly linear along one direction (e.g., Chinese Patent No. CN205406654U). During feeding, the feeding device needs to move the pouch batteries one by one to each degassing unit via a picking mechanism. Because the degassing units are linearly distributed, the picking mechanism of the feeding device has a long round trip distance, thus increasing feeding time, reducing production efficiency, and requiring a large space. Summary of the Invention

[0003] Based on this, the purpose of the present invention is to provide a secondary packaging production line for soft-pack batteries. By rationally arranging the exhaust unit of the exhaust device, the feeding efficiency of soft-pack batteries can be improved, and the space occupied by the production line can be reduced.

[0004] A pouch battery secondary packaging production line includes a loading platform for placing pouch batteries to be vented, an venting device disposed downstream of the loading platform along a first direction, and a loading device for moving pouch batteries placed on the loading platform to the venting device; the venting device includes 2n venting units symmetrically arranged about the first direction, where n≥1; each venting unit includes a fixed upper cavity mechanism and a lower cavity mechanism disposed directly below the upper cavity mechanism; the lower cavity mechanism can be moved from a first position located directly below the upper cavity mechanism to a second position along a second direction, wherein the second direction is perpendicular to the first direction; when the lower cavity mechanism moves from the first position to the second position, the loading device moves the pouch batteries to be vented located on the loading platform to the lower cavity mechanism, and then the lower cavity mechanism moves from the second position to the first position; and / or, when the lower cavity mechanism moves from the first position to the second position, the loading device removes the vented pouch batteries located in the lower cavity mechanism, and then the lower cavity mechanism moves from the second position to the first position.

[0005] The present invention relates to a soft-pack battery secondary packaging production line. By symmetrically arranging multiple exhaust units in pairs in the exhaust device, and by using the movable lower cavity in each exhaust unit in conjunction with the feeding device to achieve rapid feeding, the moving distance of the feeding device is shortened, thus improving production efficiency. Furthermore, through reasonable layout, the overall footprint of the secondary packaging production line can be reduced.

[0006] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0007] Figure 1 A top view of the pouch cell before secondary encapsulation;

[0008] Figure 2 A top view of the pouch battery after the airbag has been removed;

[0009] Figure 3 A side view of the pouch battery after the airbag bag has been removed;

[0010] Figure 4 This is a perspective view of one embodiment of the soft-pack battery secondary packaging production line of the present invention;

[0011] Figure 5 This is a diagram showing the positional relationship between the feeding platform, feeding device, and exhaust device in the soft-pack battery secondary packaging production line of the present invention.

[0012] Figure 6 This is a perspective view of the exhaust device in the secondary packaging production line for soft-pack batteries of the present invention;

[0013] Figure 7 This is a perspective view of one embodiment of the exhaust device in the secondary packaging production line for soft-pack batteries of the present invention;

[0014] Figure 8 This is a perspective view (front view) of the lower cavity mechanism in one embodiment of the exhaust device in the secondary packaging production line of the soft-pack battery of the present invention.

[0015] Figure 9 This is a perspective view (rear view) of the lower cavity mechanism in one embodiment of the exhaust device in the secondary packaging production line of the soft-pack battery of the present invention.

[0016] Figure 10 This is a perspective view (front view) of the upper cavity mechanism in one embodiment of the exhaust device in the secondary packaging production line of the soft-pack battery of the present invention.

[0017] Figure 11 This is a perspective view (rear view) of the upper cavity mechanism in one embodiment of the exhaust device in the secondary packaging production line of the soft-pack battery of the present invention.

[0018] Figure 12This is a perspective view (from below) of the upper cavity mechanism in one embodiment of the exhaust device in the secondary packaging production line for soft-pack batteries of the present invention.

[0019] Figure 13 This is a partially enlarged view (from a low angle) of the upper cavity mechanism structure A in one embodiment of the exhaust device in the soft-pack battery secondary packaging production line of the present invention.

[0020] Figure 14 This is a schematic diagram (top view) of the tray assembly of the lower cavity mechanism in another embodiment of the exhaust device in the secondary packaging production line of the soft-pack battery of the present invention.

[0021] Figure 15 This is a partial enlarged view (top view) of the waste liquid discharge port of the lower cavity structure B in another embodiment of the exhaust device in the soft-pack battery secondary packaging production line of the present invention.

[0022] Figure 16 This is a partial enlarged view (top view) of the drain channel of the lower cavity structure B in another embodiment of the exhaust device in the soft-pack battery secondary packaging production line of the present invention.

[0023] Figure 17 This is a perspective view of one embodiment of the edge-cutting device in the secondary packaging production line for soft-pack batteries of the present invention;

[0024] Figure 18 This is a perspective view of one embodiment of the pre-cutting mechanism in the secondary packaging production line for soft-pack batteries of the present invention;

[0025] Figure 19 This is a perspective view (from another angle) of one embodiment of the pre-cutting mechanism in the secondary packaging production line of the soft-pack battery of the present invention.

[0026] Figure 20 This is a schematic diagram of the structure of a cutting component in the secondary packaging production line for soft-pack batteries according to an embodiment of the present invention;

[0027] Figure 21 This is a perspective view of one embodiment of a cutting assembly installed on a cutting support frame in a soft-pack battery secondary packaging production line of the present invention;

[0028] Figure 22 This is a partially enlarged view of one embodiment of the cutting assembly installed on the cutting support frame in the soft-pack battery secondary packaging production line of the present invention;

[0029] Figure 23 This is a cross-sectional view of the second cutter and clamping structure in one embodiment of the cutting component in the secondary packaging production line of the soft-pack battery of the present invention;

[0030] Figure 24 This is a perspective view of the platform and its positioning structure in the soft-pack battery secondary packaging production line of the present invention.

[0031] Figure 25 This is a perspective view of one embodiment of the edge-cutting device in the secondary packaging production line for soft-pack batteries of the present invention;

[0032] Figure 26 This is a perspective view of the first and second precision cutting mechanisms, which are mirror images of each other, in the soft-pack battery secondary packaging production line of the present invention.

[0033] Figure 27 This is a diagram showing the positional relationship between the pre-cutting mechanism, the first precision cutting mechanism, the second precision cutting mechanism, and the cutting transmission mechanism in the edge-cutting device of the soft-pack battery secondary packaging production line of the present invention.

[0034] Figure 28 This is a partially enlarged view of the cutting and conveying structure in the edge-cutting device of the soft-pack battery secondary packaging production line of the present invention;

[0035] Figure 29 This is a schematic diagram showing the positions of the first folding mechanism, the first hot-stamping mechanism, and the conveying mechanism in the folding and hot-stamping device of the soft-pack battery secondary packaging production line of the present invention.

[0036] Figure 30 This is a perspective view of the first folding mechanism of the folding and hot-pressing device in the soft-pack battery secondary packaging production line of the present invention;

[0037] Figure 31 This is a perspective view (from another angle) of the first folding mechanism of the folding and hot-pressing device in the soft-pack battery secondary packaging production line of the present invention.

[0038] Figure 32 This is a perspective view of the first folding component of the folding and hot-pressing device in the soft-pack battery secondary packaging production line of the present invention;

[0039] Figure 33 This is a perspective view of the first folding fixture of the folding and hot-pressing device in the soft-pack battery secondary packaging production line of the present invention;

[0040] Figure 34 This is a partial enlarged view of the first folding fixture of the folding and hot-pressing device in the soft-pack battery secondary packaging production line of the present invention;

[0041] Figure 35 This is a perspective view of the first folding and pressing plate of the folding and pressing device in the soft-pack battery secondary packaging production line of the present invention;

[0042] Figure 36 This is a side view of the soft-pack battery after the shorter side of the soft-pack battery is folded by the first folding mechanism of the folding and hot-pressing device in the soft-pack battery secondary packaging production line of the present invention.

[0043] Figure 37This is a side view of the soft-pack battery after the first folding mechanism in the folding and hot-pressing device of the soft-pack battery secondary packaging production line of the present invention folds the longer side of the soft-pack battery.

[0044] Figure 38 This is a perspective view of the first hot-pressing mechanism of the edge-folding and hot-pressing device in the soft-pack battery secondary packaging production line of the present invention;

[0045] Figure 39 This is a perspective view of the conveying mechanism of the edge-folding and hot-pressing device in the soft-pack battery secondary packaging production line of the present invention;

[0046] Figure 40 This is a perspective view of the second folding mechanism of the folding and hot-pressing device in the soft-pack battery secondary packaging production line of the present invention;

[0047] Figure 41 This is a partially enlarged view of the second folding mechanism of the folding and hot-pressing device in the soft-pack battery secondary packaging production line of the present invention;

[0048] Figure 42 This is a perspective view of the second folding fixture of the folding and hot-pressing device in the soft-pack battery secondary packaging production line of the present invention;

[0049] Figure 43 This is a schematic diagram of the second hot-pressing mechanism of the edge-folding and hot-pressing device in the soft-pack battery secondary packaging production line of the present invention. Detailed Implementation

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0051] Figure 1-3 The specific structures of pouch batteries after different processing techniques are shown. For example... Figure 1-3 As shown, the pouch battery 10 after forming typically includes three parts: the battery body 10a, the air bag 10b, and the tabs 10c. To release the gas generated during forming, the pouch battery 10 needs to be vented. After venting, the air bag 10b of the pouch battery 10 is removed using a trimming process. After the trimming process is completed, the battery body 10a has tabs on both sides along its width direction. Figure 2-3 The side edge 10d shown needs to be folded and hot-stamped to make both sides 10d fit close to the battery body 10a, thus obtaining the finished soft-pack battery.

[0052] Figure 4-5 An exemplary structure of the pouch battery secondary packaging production line of the present invention is shown. The pouch battery secondary packaging production line includes a loading platform 1, an exhaust device 3 disposed downstream of the loading platform 1 along a first direction D1, and a loading device 2 for moving the pouch battery 10 placed on the loading platform 1 to the exhaust device 3.

[0053] Specifically, such as Figure 5-6 As shown, the exhaust device 3 includes an exhaust bracket 33, four exhaust units 30 mounted on the exhaust bracket 33, and a lower cavity drive assembly 35 corresponding to each exhaust unit 30. The four exhaust units 30 are a first exhaust unit 301, a second exhaust unit 302, a third exhaust unit 303, and a fourth exhaust unit 304, which are symmetrically arranged in pairs about a first direction D1. The first exhaust unit 301 and the second exhaust unit 302 are arranged opposite each other downstream of the loading platform 1 along a second direction D2, and the third exhaust unit 303 and the fourth exhaust unit 304 are arranged opposite each other downstream of the first exhaust unit 301 and the second exhaust unit 302 along a second direction D2. The third exhaust unit 303 is adjacent to the first exhaust unit 301, and the fourth exhaust unit 304 is adjacent to the second exhaust unit 302.

[0054] Figure 7 An exemplary structure of the venting device in the secondary packaging production line of the soft-pack battery of the present invention is shown. For example... Figure 5-6 As shown, the exhaust unit 30 includes an upper cavity mechanism 31 fixed on the exhaust bracket 33, and a lower cavity mechanism 32 disposed directly below the upper cavity mechanism 31. The upper cavity mechanism 31 can move up and down in the vertical direction, and when the upper cavity mechanism 31 moves downward, it can cover the top of the lower cavity mechanism 32.

[0055] Specifically, such as Figure 8-9As shown, the lower cavity mechanism 32 includes a lower cavity base 320 and a tray assembly 322 disposed on 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-shaped lower end cap 324 is provided between the battery body tray 3220 and the airbag tray 3222. The lower end cap 324 is made of metal and is connected to a heating block. A base sliding assembly (not shown) is provided at the bottom of the lower cavity base 320. The base sliding assembly includes at least one slide rail (not shown) parallel to the second direction D2 and a slider (not shown) that slides in cooperation with the slide rail. The slider is slidably connected to the slide rail, and the lower cavity base 320 is fixedly connected to the slider. The lower cavity base 320 can move back and forth along the second direction D2 via the base sliding assembly (not shown).

[0056] Each lower cavity drive assembly 35 is disposed on one side of its corresponding exhaust unit 30, and is used to drive the corresponding lower cavity base 320 to move back and forth along the second direction D2. The lower cavity drive assembly 35 includes two drive wheels (not shown) distributed along the second direction D2, a drive belt (not shown) sleeved on the outer periphery of the two drive wheels (not shown) and cooperating with the drive wheels to drive them, a clamping block (not shown) clamping the drive belt and fixedly connected to the lower cavity base 320, and a base drive motor 350 that rotates with one of the drive wheels. The base drive motor 350 has an output shaft, which is fixedly connected to the axis of the drive wheel to drive the drive wheel (not shown) to rotate, thereby driving the drive belt to rotate. Under the cooperation of the drive belt and the clamping block on the drive belt, the lower cavity base 320 is driven to move from a first position located directly below the upper cavity mechanism 31 along the second direction D2 to a second position located at the axis of symmetry of the two exhaust units 30, that is, the lower cavity bases 320 of the two symmetrically arranged exhaust units 30 move to the same position.

[0057] The loading device 2 includes a loading bracket 20, a first transfer robot 221 and a second transfer robot 222 slidably mounted on the loading bracket 20, and a first transfer linear motor and a second transfer linear motor for driving the first transfer robot 221 and the second transfer robot 222 to move back and forth along a first direction D1. The first transfer robot 221 is closer to the loading platform 1, and the second transfer robot 222 is farther from the loading platform 1. Both the first transfer robot 221 and the second transfer robot 222 have a transfer adsorption assembly (not shown) capable of adsorbing the soft-pack battery 10. The transfer adsorption assembly includes multiple suction cups (not shown) with downward-facing adsorption ports, which are connected to a vacuum device (not shown) to generate an adsorption force on the soft-pack battery 10. The first transfer robot 221 can move above the loading platform 1 to move the pouch batteries 10 to be degassed on the loading platform 1 to the lower cavity base 320 of each degassed unit 30. The second transfer robot 22 then unloads the pouch batteries 10 that have completed degassed from the lower cavity base 320 or moves them to the next functional device on the production line for further processing. The following uses the first degassed unit 301 and the second degassed unit 302 as examples to illustrate the collaborative loading process of the loading device 2 and the degassed device 3:

[0058] During loading, the pouch battery 10 to be vented is first placed on the loading platform 1. Then, the lower cavity drive assembly 35 corresponding to the first venting unit 301 drives the lower cavity base 320 from the first position to the second position. At this time, the first transfer robot 221 picks up the pouch battery 10 from directly above the loading platform 1, then moves to the lower cavity base 320 at the second position and places the pouch battery 10 to be vented on the tray assembly 322 of the lower cavity base 320. Then, the lower cavity base 320 moves back to the first position under the drive of the lower cavity drive assembly 35, and vents the pouch battery 10 with the cooperation of the upper cavity mechanism 31 and the lower cavity mechanism 32. After placing the pouch battery 10 on the lower cavity base 320, the first transfer robot 221 also moves back to the loading platform 1 to pick up the new battery. When the lower cavity base 320 of the first exhaust unit 301 moves to the first position, the lower cavity base 320 of the second exhaust unit 302, which is symmetrically arranged with it, moves from the first position to the second position. At the same time, the first transfer robot 221 picks up the material from the loading platform 1 again, and then moves it to the upper part of the lower cavity base 320 of the second exhaust unit 302 located in the second position, and places the soft-pack battery 10 to be vented on the lower cavity base 320. Then, the lower cavity base 320 moves back to the first position to vent the soft-pack battery 10.

[0059] During the aforementioned feeding process, the movement of the lower cavity base 320 of the first exhaust unit 301 and the lower cavity base 320 of the second exhaust unit 302 between their corresponding first and second positions is alternating. That is, when the lower cavity base 320 of the first exhaust unit 301 moves from the second position to the first position, the lower cavity base 320 of the second exhaust unit 302 moves from the first position to the second position, and vice versa. Thus, by alternating the movement of the lower cavity bases 320 of the two exhaust units 30, alternating feeding is achieved, which increases the feeding speed and avoids collisions caused by both lower cavity bases 320 moving to the second position simultaneously. Similarly, the movement of the two lower cavity bases 320 of the symmetrically arranged third exhaust unit 303 and fourth exhaust unit 304 between their first and second positions is also alternating.

[0060] After the pouch battery 10 completes its venting process via the first venting unit 301, the lower cavity base 320 of the first venting unit 301 moves the pouch battery 10 from the first position to the second position. At this time, the second transfer robot 222 moves above the lower cavity base 320 of the first venting unit 301 and removes the pouch battery 10, either unloading it or moving it to the next functional device for further processing. Then, the lower cavity base 320 of the first venting unit 301 waits in the second position for the first transfer robot 221 to reload it. Of course, only one transfer robot can be installed on the transfer bracket, that is, one transfer robot can perform loading and unloading simultaneously. However, compared to other methods, the coordinated work of two transfer robots is more conducive to improving the loading efficiency.

[0061] Thus, by symmetrically arranging the 2n (n≥1) exhaust units 30 in the exhaust device 3 along the conveying direction of the soft-pack battery 10, the moving distance of the transfer robot arm of the loading device 2 when loading or unloading can be reduced, thereby reducing the time consumed in loading and unloading. Taking the above embodiment as an example, when the loading device 2 performs loading on the exhaust unit 30 that is furthest away, the first transfer robot arm 221 only needs to move 2 stations (one lower cavity base 320 is one station) along the first direction D1 to complete the loading. After completing the loading, it only needs to move 2 stations to return to the top of the loading platform 1 to pick up the material again. If the four exhaust units 30 are arranged in a straight line along the first direction D1, when the feeding device 2 feeds the exhaust unit 30 that is furthest away, the first transfer robot 221 needs to move 4 stations along the first direction D1 to feed it. Similarly, after feeding is completed, it also needs to move 4 stations to pick up the material again. This greatly increases the feeding time. Moreover, the arrangement of multiple exhaust units 30 in a straight line means that a longer factory space is needed to assemble a complete production line, which occupies a large space.

[0062] After the soft-pack battery 10 to be vented is moved to the first position by the lower cavity base 320 of the venting unit 30, the lower cavity mechanism 32 cooperates with the upper cavity mechanism 31 to vent the air bag 10b of the soft-pack battery 10. Figure 10-16 As shown, the upper cavity mechanism 31 of the exhaust unit 30 includes an upper cavity fixing plate 312 fixed on the exhaust bracket 33, an exhaust 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 exhaust lifting cylinder 314. Here, the output end of the exhaust 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 exhaust lifting cylinder 314 is vertically downward along the vertical direction and 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. The upper cavity mounting plate 3164 is fixed to the top of the upper cavity cover 310, and the output end of the exhaust lifting cylinder 314 is fixedly connected to the upper cavity movable plate 3160. When the exhaust lifting cylinder 314 is working, it drives the upper cavity cover 310 to move up and down through the drive connecting frame 316.

[0063] The upper cavity cover 310 is a square or rectangular body adapted to the shape of the lower cavity base 320, and has a downward-facing receiving cavity 310a. When the exhaust lifting cylinder 314 drives the upper cavity cover 310 to move downward, the upper cavity cover 310 closes onto the lower cavity base 320, forming a sealed chamber in the receiving cavity 310a. To ensure that the upper cavity cover 310 accurately closes onto the lower cavity base 320, it can be done as follows: Figure 11As shown, four exhaust guide shafts 318 extending vertically are provided at the four corners of the upper cavity fixing plate 312. The lower ends of the exhaust guide shafts 318 are fixedly connected to the top of the upper cavity cover 310. Guide sleeves 317 that slide in cooperation with the exhaust guide shafts 318 are provided on the upper cavity fixing plate 312 to ensure that the upper cavity movable plate 3160 does not shift when the exhaust lifting cylinder 314 drives it to move downward. The sealed chamber is connected to a vacuuming mechanism (not shown) to evacuate the sealed chamber. The sealed chamber is also connected to a vent valve 326. When evacuating, the vent valve 326 is closed to facilitate the formation of the sealed chamber. When exhaust is completed, the vent valve 326 is opened to introduce air or other gases into the sealed chamber to facilitate the separation of the upper cavity cover 310 from the lower cavity base 320. The accommodating cavity 310a contains an upper end cap 3104 corresponding to the lower end cap 324 and a bayonet 3100 located directly above the airbag tray 3222. The bayonet 3100 can be one, or multiple bayonets... Figure 12-14 The arrangement shown includes multiple bayonets; in this embodiment, there are nine bayonets 3100, arranged in a row along the length of the upper end cap 3104. Compared to traditional puncture needles, the bayonets 3100 in this embodiment have a larger cross-sectional area, allowing for the formation of larger puncture holes in the airbag 10b, facilitating rapid gas discharge. Specifically, the cross-sectional area of ​​the bayonet 3100 is polygonal. The elongated upper end cap 3104 is made of metal and connected to a heating element.

[0064] After the upper cavity mechanism 31 moves downward and forms a sealed chamber with the lower cavity mechanism 32, the vacuum pumping mechanism (not shown) is activated to evacuate the sealed chamber, and the bayonet 3100 punctures the airbag 10b to expel the air from the soft-pack battery 10.

[0065] However, due to the limited vacuuming force, the vacuuming time needs to be extended to ensure that all air inside the pouch battery 10 is expelled. To accelerate the exhaust speed of the pouch battery 10, a pressing member 3102 that can move vertically is also provided in the accommodating cavity 310a. The pressing member 3102 has a square or rectangular plate structure and faces the battery body tray 3220. To enable the pressing member 3102 to move vertically, the upper cavity mechanism 31 includes a pressing member driving cylinder 3103 disposed above the upper cavity cover 310. The output end of the pressing member driving cylinder 3103 passes downward through the top of the upper cavity cover 310 and is fixedly connected to the pressing member 3102 to drive the pressing member 3102 to move up and down.

[0066] Before the exhaust unit 30 operates, the soft-pack battery 10 is placed on the tray assembly 322 of the lower cavity base 320 via the feeding device 2. The battery body 10a of the soft-pack battery 10 is positioned above the battery body tray 3220, and the airbag 10b spans the lower end cap 324 and is positioned above the airbag tray 3222. The upper end cap 3104 and lower end cap 324 are then preheated via a heating block. When the exhaust unit 30 operates, the exhaust lifting cylinder 314 drives the upper cavity cover 310 downwards to cover the top of the lower cavity base 320, thus forming a sealed chamber in the accommodating cavity 310a of the upper cavity cover 310. Then, a vacuum is evacuated from the sealed chamber using a vacuuming mechanism (not shown). As the upper cavity cover 3100 moves downwards, the bayonet 3100 punctures the airbag 10b, creating a puncture opening. Then, the extrusion cylinder 3103 drives the extrusion component 3102 to extrude the battery body 10a, causing the gas inside the battery body 10a to quickly escape through the puncture opening. The extruded air is then removed by a vacuum mechanism (not shown). After all the gas inside the battery body 10a has been expelled, the upper end cap 3104 and the lower end cap 324 cooperate to form a straight-line isolation seal between the puncture opening and the battery body 10a. Thus, the extrusion of gas by the extrusion component 3102 on the battery body 10a accelerates the gas expulsion, shortens the venting time, and improves production efficiency. After venting is complete, air or other gases are introduced into the sealed chamber through the vent valve 326, allowing the upper cavity cover 310 to separate from the lower cavity base 320, preparing for the venting process of the next soft-pack battery 10.

[0067] Furthermore, such as Figure 13 As shown, each bayonet 3100 is positioned adjacent to the extrusion member 3102. This shortens the distance between the bayonet 3100 at the puncture opening formed by the airbag 10b and the battery body 10a, thereby accelerating the gas discharge speed.

[0068] Since some electrolyte will also flow out from the puncture opening when the bayonet 3100 punctures the airbag 10b, in order to ensure that the upper cavity cover 310 completely covers the lower cavity base 320 before the bayonet 3100 punctures the airbag 10b, and to prevent the electrolyte from overflowing everywhere, the upper cavity mechanism 31 of the above-mentioned exhaust device 3 also includes a bayonet drive cylinder 3101 set on the upper cavity mounting plate 3164. Each bayonet 3100 arranged linearly in the accommodating cavity 310a is fixed to the bottom of a connecting block (not shown). 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 connecting block (not shown) to drive each bayonet 3100 to move downwards simultaneously. After the upper cavity cover 310 is closed onto the lower cavity base 320 to form a sealed chamber, the bayonet drive cylinder 3101 drives each bayonet 3100 to move downwards simultaneously, piercing the airbag 10b. Then, the compression drive cylinder 3103 drives the compression member 3102 to accelerate the gas discharge speed of the battery body 10a. In this way, it can be ensured that the electrolyte will not overflow outside the sealed chamber. Here, the vacuuming mechanism (not shown) can start evacuating the sealed chamber after the bayonet 3100 pierces the airbag 10b, or it can start evacuating the sealed chamber before the bayonet 3100 pierces the airbag 10b. In this embodiment, the vacuum is evacuated first, and then the piercing opening is formed in the airbag 10b.

[0069] Preferably, the upper cavity cover 310's accommodating cavity 310a is also horizontally provided with an airbag pressure plate 3106. The airbag pressure plate 3106 is rectangular and located directly below the bayonet 3100. The airbag pressure plate 3106 has bayonet through holes 3106a corresponding to the bayonet 3100, allowing the bayonet 3100 to pass through. When the upper cavity cover 310 and the lower cavity base 320 form a sealed chamber, the airbag pressure plate 3106 abuts against the airbag 10b, and the bayonet drive cylinder 3101 drives the bayonet 3100 to pass through the bayonet through hole 3106a, puncturing the airbag 10b. After completion, the bayonet 3100 is then driven to move upward and retract into the bayonet through hole 3106a. Thus, the pressure exerted by the airbag pressure plate 3106 on the airbag 10b facilitates the bayonet 3100's successful puncture of the airbag 10b. Preferably, the two ends of the airbag pressure plate 3106 along its length are elastically connected to the top wall of the accommodating cavity 310a by springs, so that the airbag pressure plate 3106 has a certain buffering elasticity in the vertical direction to accommodate airbags 10b of different volumes.

[0070] Furthermore, the upper cavity mechanism 31 of the aforementioned exhaust device 3 also includes an upper end cap driving cylinder 3105 disposed on the upper cavity mounting plate 3164. The output end of the upper end cap driving cylinder 3105 passes through the top of the upper cavity cover 310 and is fixedly connected to the upper end cap 3104 to drive the upper end cap 3104 to move downward. After all the gas in the battery body 10a is discharged, the upper end cap driving cylinder 3105 drives the upper end cap 3104 to move downward, pressing the airbag 10b against the lower end cap 324, forming an isolation seal on the airbag 10b.

[0071] During the operation of the exhaust device 3, due to the compression of the compression member 3102, some electrolyte will overflow from the puncture opening of the airbag 10b. To collect this overflowing electrolyte, the exhaust device also includes a storage tank 34 connected to the lower cavity mechanism 32. For example... Figure 14-16 As shown, the airbag tray 3222 is divided into upper and lower layers. The upper layer has a waste liquid collection port 3222a that can be engaged with the bayonet 3100, located directly opposite the bayonet 3100. The lower layer has a waste liquid collection chamber 3222b that connects to each waste liquid collection port 3222a. The lower cavity base 320 has a waste liquid discharge port 320b that connects to the waste liquid collection chamber 3222b. The interconnected waste liquid collection ports 3222a, waste liquid collection chamber 3222b, and waste liquid discharge port 320b form a waste liquid collection channel in the lower cavity mechanism 32. The liquid inlet of the liquid storage tank 34 is connected to the waste liquid discharge port 320b through a pipe, while the air extraction port of the liquid storage tank 34 is connected to a vacuum mechanism (not shown). Thus, when the bayonet 3100 moves downward and pierces the upper and lower surfaces of the airbag 10b, under the suction action of the vacuum mechanism (not shown) and gravity, the gas and electrolyte inside the airbag 10b are discharged from the lower surface of the airbag 10b and collected into the storage tank 34 through the waste liquid collection channel.

[0072] Furthermore, the top of the airbag tray 3222 is also provided with an annular drainage trough 3222c that is connected to the waste liquid collection port 3222a, so as to collect the electrolyte that flows to the periphery of the airbag tray 3222 during the puncture of the airbag.

[0073] To trim the edges of the pouch cell 10a after venting, the aforementioned pouch cell secondary packaging production line also includes a trimming device 4 located downstream of the venting device 3 along the first direction D1. For example... Figure 17 An exemplary structure of the edge-cutting device in the secondary packaging production line of the soft-pack battery of the present invention is shown. Figure 17As shown, the edge-cutting device 4 includes a pre-cutting mechanism 40, a precision cutting mechanism 41, and a first conveying mechanism 46. There are two precision cutting mechanisms 41: a first precision cutting mechanism 42 and a second precision cutting mechanism 44. The first precision cutting mechanism 42 and the second precision cutting mechanism 44 are sequentially arranged downstream of the pre-cutting mechanism 40 along the first direction D1. The first precision cutting mechanism 42 and the second precision cutting mechanism 44 are mirror images of each other about the first direction D1, to further precision cut the soft-pack battery 10 with the airbag 10b removed along both sides 10d of the first direction D1. The first conveying mechanism 46 is used to transfer the pouch battery 10 of the pre-cutting mechanism 40 to the stage 4000 of the first precision cutting mechanism 42 for the first precision cutting; after completion, the first conveying mechanism 46 transfers the pouch battery 10 placed on the stage 4000 of the first precision cutting mechanism 42 to the stage 4000 of the second precision cutting mechanism 44 for the second precision cutting; after completion, the first conveying mechanism 46 transfers the pouch battery 10 to the next functional device.

[0074] Figure 18-24 An exemplary structure of the pre-cutting mechanism in the secondary packaging production line of the soft-pack battery of the present invention is shown. For example... Figure 18-19 As shown, the pre-cutting mechanism 40 includes a support base plate 401, a platform 4000 and a cutting support frame 402 disposed on the support base plate 401, and a cutting assembly 400 mounted on the cutting support frame 402, wherein the platform 4000 is located on one side of the cutting support frame 402 along the second direction D2.

[0075] like Figure 21-22 As shown, the cutting assembly 400 includes a first cutter 4001 and a second cutter 4002 disposed opposite to each other, and a second cutter drive structure connected to the second cutter 4002 for driving the second cutter 4002 to move downward toward the first cutter 4001.

[0076] Specifically, the first cutter 4001 has a carrying surface 4001a that can abut against the workpiece and a cutting surface 4001b perpendicular to the carrying surface 4001a. The second cutter drive structure includes a second cutter drive cylinder 40040, the movable rod of the second cutter drive cylinder 40040 is vertically downward and connected to the second cutter 4002. During cutting, the workpiece is placed on the carrying surface 4001a and extends between the second cutter 4002 and the first cutter 4001. The second cutter drive cylinder 40040 drives the second cutter 4002 to move along the working surface P parallel to the cutting surface 4001b towards the first cutter 4001, cutting off the portion of the workpiece placed on the carrying surface 4001a that protrudes from the cutting surface 4001b.

[0077] Because the area of ​​the carrying surface 4001a of the first cutter 4001 is limited, the soft-pack battery 10 placed on the carrying surface 4001a is prone to shaking. Therefore, in order to fix the position of the soft-pack battery 10 before cutting and ensure accurate cutting, the cutting assembly 400 also includes a clamping structure 4006 disposed on the second cutter 4002. The clamping structure 4006 specifically includes a cutting pressure plate 40060, which is located on the side of the second cutter 4002 near the first cutter 4001 along the direction parallel to the carrying surface 4001a, and can slide up and down relative to the second cutter 4002. The cutting pressure plate 40060 protrudes from the second cutter 4002 in the direction along which the second cutter 4002 moves toward the first cutter 4001. The bottom surface of the cutting pressure plate 40060 is a pressing surface 40060a parallel to the carrying surface 4001a of the first cutter 4001. As the second cutter 4002 moves along the working surface P toward the first cutter 4001, the pressing surface 40060a of the cutting pressure plate 40060 first abuts against the carrying surface 4001a of the first cutter 4001. Thus, when the carrying surface 4001a holds the airbag 10b of the soft-pack battery 10 to be cut, the cutting pressure plate 40060 contacts the workpiece before the second cutter 4002 and clamps the workpiece with the carrying surface 4001a of the first cutter 4001. Then, the second cutter 4002 continues to move along the working surface P relative to the cutting pressure plate 40060 toward the first cutter 4001 and cooperates with the cutting surface 4001b of the first cutter 4001 to cut off the portion of the workpiece protruding from the cutting surface 4001b.

[0078] In practical applications, the aforementioned cutting component 400 can be installed in, for example, Figure 21 The cutting support frame 402 shown is specifically mounted on a support base plate 401. The cutting support frame 402 includes a lower support plate 4021, an upper support plate 4022 located above the lower support plate 4021, and a vertical support plate 4024 connecting the lower support plate 4021 and the upper support plate 4022 respectively. A first cutting blade 4001 is mounted on the lower support plate 4021, and the cylinder body of a second cutting blade drive cylinder 40040 is mounted on the upper support plate 4022, with its movable rod pointing vertically downwards and fixedly connected to the second cutting blade 4002 to drive the second cutting blade 4002 to cooperate with the first cutting blade 4001 in cutting the workpiece. Preferably, a waste discharge bin 406 can be provided on the side of the first cutting blade 4001 near its cutting surface 4001b to collect the cut waste.

[0079] During the cutting process of the airbag 10b, the cutting accuracy often affects the quality of the final product. The cutting accuracy is primarily influenced by the gap between the second cutter 4002 and the first cutter 4001 at the moment of cutting; a smaller gap results in higher cutting accuracy, and vice versa. To reduce the gap between the second cutter 4002 and the first cutter 4001, it is necessary to ensure that the second cutter 4002 does not experience any positional deviation during its movement towards the first cutter 4001. To reduce or even eliminate any positional deviation of the second cutter 4002 during its movement... Figure 21 The second cutter drive structure shown also includes a horizontally arranged cutting movable plate 40042 fixed to the front end of the movable rod of the second cutter drive cylinder 40040, a cutting guide post 40044 arranged vertically and passing through the cutting movable plate 40042, a guide post (not shown) sleeved on the outer periphery of the cutting guide post 40044 and slidable up and down relative to the cutting guide post 40044 along its axial direction, and a guide sleeve 40048 used in conjunction with the guide post (not shown) and slidable up and down relative to the guide post (not shown) along its axial direction. The axial direction of the cutting guide post 40044 is parallel to the direction in which the second cutter 4002 moves towards the first cutter 4001. The guide sleeve 40048 is fixedly connected to the cutting movable plate 40042. The second cutter 4002 is vertically fixed on the cutting movable plate 40042. The movable rod of the second cutter drive cylinder 40040 is fixedly connected to the cutting movable plate 40042 to drive the cutting movable plate 40042 to move up and down. Through the friction and clearance fit between the cutting guide post 40044 and the guide post (not shown) and the guide sleeve 40048, it is ensured that the second cutter 4002 will not shift during downward movement. This minimizes the gap between the second cutter 4002 and the first cutter 4001 at the moment of cutting, thereby ensuring cutting accuracy and improving the quality of battery products. Preferably, as follows... Figure 18 and 21 As shown, a guide post limiting spring 40049 is also sleeved on the outer periphery of the lower part of the cutting guide post 40044 to limit the downward sliding stroke of the guide post (not shown) and prevent the guide post (not shown) from disengaging from the guide sleeve 40048 during the downward movement.

[0080] To achieve sliding of the cutting pressure plate 40060 relative to the second cutter 4002, it can be done as follows: Figure 22As shown, two L-shaped limiting plates 40062 are fixedly connected to both ends of the second cutter 4002 along its length. Both ends of the second cutter 4002 and the cutting pressure plate 40060 are accommodated within the recesses of the two L-shaped limiting plates 40062. The second cutter 4002 is fixed to the cutting movable plate 40042, and the cutting pressure plate 40060 is located between the second cutter 4002 and the limiting plates 40062, sliding vertically up and down. In this embodiment, the friction between the cutting pressure plate 40060 and the second cutter 4002 and the limiting plates 40062 prevents the cutting pressure plate 40060 from falling off under its own force. Figure 21 In addition to the method shown, a slide rail extending vertically can be provided on the second cutter 4002 (or cutting plate 40060), and a slider adapted to the slide rail can be provided on the cutting plate 40060 (or the second cutter 4002). In this way, the cutting plate 40060 can also slide up and down relative to the second cutter 4002. This is not the only limitation.

[0081] To better fix the relative position of the cutting pressure plate 40060 and the second cutter 4002, and to achieve the reset of the cutting pressure plate 40060 after the workpiece is cut off, the aforementioned clamping structure 4006 also includes a pressure plate reset elastic element 40064. For example... Figure 22As shown, the second cutter 4002 has a receiving groove 4002a on its side near the cutting pressure plate 40060, and a receiving hole 40060b is provided on the cutting pressure plate 40060 opposite to the receiving groove 4002a. The receiving groove 4002a and the receiving hole 40060b form a receiving cavity for accommodating the pressure plate reset elastic member 40064. The pressure plate reset elastic member 40064 in the receiving cavity extends vertically, its upper end is fixedly connected to the second cutter 4002 and abuts against the cutting pressure plate 40060, and its lower end abuts against both the second cutter 4002 and the cutting pressure plate 40060. Thus, by fixing the pressure plate reset elastic element 40064 to the second cutter 4002 and abutting against the cutting pressure plate 40060, the position of the cutting pressure plate 40060 in the vertical direction can be restricted, preventing the cutting pressure plate 40060 from falling. In addition, by abutting against the second cutter 4002 and the cutting pressure plate 40060, the cutting pressure plate 40060 can press against the airbag 10b placed on the loading surface 4001a of the first cutter 4001, while the second cutter 4002 can continue to move downward relative to the cutting pressure plate 40060 to cut off the workpiece. During this process, the pressure plate reset elastic element 40064 is compressed. After the cutting is completed, the second cutter 4002 moves upward in the vertical direction, and the cutting pressure plate 40060 is reset under the elastic action of the pressure plate reset elastic element 40064 for the next cutting. Of course, to increase the contact area between the upper and lower ends of the pressure plate reset elastic element 40064 and the second cutter 4002 and the cutting pressure plate 40060, the pressure plate reset elastic element 40064 can be provided with the following at the upper and lower ends respectively: Figure 22 The elastic abutment block 40066 shown allows the two ends of the pressure plate reset elastic element 40064 to better receive / apply force.

[0082] The stage 4000 is generally rectangular and is located on the opposite side of the first cutter 4001, parallel to its loading surface 4001a, relative to the second cutter 4002. The stage 4000 is provided with a positioning structure for positioning the pouch battery 10 placed on the stage 4000. The positioning structure includes a first side positioning component and a second side positioning component. Specifically, as shown... Figure 24The first side positioning assembly includes two first side positioning blocks 40081, which are respectively disposed on opposite sides of the platform 4000 along the second direction D2, and the distance between the two first side positioning blocks 40081 is adjustable. To achieve the adjustable distance between the two first side positioning blocks 40081, at least one first side positioning block 40081 can move back and forth along the second direction D2. Specifically, the first side positioning assembly also includes a first side positioning cylinder (not shown), a first positioning slide rail (not shown) disposed at the lower part of the platform 4000 and extending along the second direction D2, and a first positioning slider (not shown) that slides in cooperation with the first positioning slide rail. The first side positioning block 40081 is fixed on the first positioning slide rail, and the movable rod of the first side positioning cylinder is fixedly connected to the first side positioning block 40081 to drive the first side positioning block 40081 to move back and forth along the second direction D2. In this way, through the cooperation of the two first side positioning blocks 40081, the position of the workpiece placed on the platform 4000 along the first direction D1 can be restricted. Similarly, in order to realize the adjustable distance between the two second side positioning blocks 40082, at least one second side positioning block 40082 can move back and forth along the first direction D1. The second side positioning assembly includes two second side positioning blocks 40082, which are respectively disposed on opposite sides of the platform 4000 along the first direction D1. At least one of the second side positioning blocks 40082 can move back and forth along the first direction D1. Specifically, the second side positioning assembly also includes a second side positioning cylinder (not shown), a second positioning slide rail (not shown) disposed at the lower part of the platform 4000 and extending along the first direction D1, and a positioning slider (not shown) that slides in cooperation with the second positioning slide rail. The second side positioning block 40082 is fixed on the second positioning slide rail. The movable rod of the second side positioning cylinder is fixedly connected to the second side positioning block 40082 to drive the second side positioning block 40082 to move back and forth along the second direction D2. In this way, through the cooperation of the two second side positioning blocks 40082, the position of the soft-pack battery 10 placed on the platform 4000 along the second direction D2 can be restricted, and the accurate positioning of the soft-pack battery 10 can be achieved to ensure the accuracy of cutting. The second direction D2 is perpendicular to the first direction D1.

[0083] In use, the battery body 10a of the soft-pack battery 10 is first placed on the stage 4000. Then, the airbag 10b to be cut is placed between the second cutter 4002 and the first cutter 4001, and abuts against the loading surface 4001a of the first cutter 4001. The second cutter 4002 is driven downward by the second cutter drive structure to cooperate with the first cutter 4001 to cut off the airbag 10b. Since some electrolyte may still remain in the airbag 10b, in order to prevent the electrolyte from dripping onto the support base plate 401 and flowing in all directions when cutting the airbag 10b, a liquid receiving box 408 can also be provided on the support base plate 401 to collect the dripping electrolyte.

[0084] Furthermore, to accommodate pouch cells 10 of different sizes and to facilitate the transfer of pouch cells 10 between the pre-cutting mechanism 40 and its upstream exhaust device 3 and downstream first precision cutting mechanism 42, the pre-cutting mechanism 40 further includes a platform moving assembly for driving the platform 4000 to move back and forth along the second direction D2. The platform moving assembly specifically includes two parallel platform slide rails 4040 disposed on the support base plate 401 and a platform slider 4042 that slides in cooperation with the platform slide rails 4040; platform drive wheels 4044 respectively disposed at both ends of the platform slide rails 4040 along the second direction D2; a platform drive belt 4046 sleeved on the outer periphery of the two platform drive wheels 4044 and cooperating with the platform drive wheels 4044 for transmission; a platform drive clamping block 4049 that clamps the platform drive belt 4046; and a platform drive motor 4048. The stage drive motor 4048 has an output shaft that is fixedly connected to the axis of one of the stage drive wheels 4044 to drive the stage drive wheel 4044 to rotate. The stage 4000 is fixed on the stage slider 4042 and fixedly connected to the stage drive clamping block 4049.

[0085] The platform 4000 moves along the second direction D2 through three stations: a loading station, a cutting station, and an unloading station. In use, the soft-pack battery 10 to be cut is placed on the platform 4000 at the loading station. Then, the platform drive motor 4048 is started. The platform drive motor 4048 drives the platform transmission wheel 4044 and the platform transmission belt 4046 to rotate, causing the platform drive clamping block 4049 to move along the second direction D2. This drives the platform 4000 to move along the second direction D2 towards the positions of the first cutter 4001 and the second cutter 4002 until the soft-pack battery 10 is moved to the preset cutting station. The platform 4000 then stops conveying the battery, and the cutting assembly 400 cuts off the airbag 10b. The cut airbag 10b is collected in the waste discharge bin 406. Then, the stage 4000 moves the cut soft-pack battery 10 along the second direction D2 to the unloading station, and then moves the soft-pack battery 10 to the first precision cutting mechanism 42 through the first conveying mechanism 46.

[0086] Furthermore, as the stage 4000 moves along the second direction D2, the pouch battery 10 placed on the stage 4000 is prone to shaking or even displacement. To prevent the pouch battery 10 placed on the stage 4000 from shifting, the stage 4000 is also provided with an adsorption structure (not shown). The adsorption structure (not shown) specifically consists of multiple adsorption through holes on the top surface of the stage 4000 and a vacuum device communicating with the adsorption through holes. By evacuating a vacuum through the vacuum device, a negative pressure is generated inside the adsorption through holes, which in turn generates an adsorption force on the pouch battery 10 to fix its position on the stage 4000.

[0087] Figure 25 The diagram illustrates the specific structure of one embodiment of the first precision cutting mechanism in the pouch battery secondary packaging production line of the present invention. The difference between the first precision cutting mechanism 42 and the pre-cutting mechanism 40 is that the first precision cutting mechanism 42 does not have a platform moving assembly, and the platform 4000 of the first precision cutting mechanism 42 does not have an adsorption structure. Therefore, the platform 4000 of the precision cutting mechanism 42 cannot move along the first direction D1. Since the platform 4000 cannot move, and the large airbag 10b has been cut off, there is no need to provide an adsorption structure (not shown) for fixing the pouch battery 10 on the platform 4000. Since the working principle of the first precision cutting mechanism 42 in cutting the pouch battery 10 is the same as that of the pre-cutting mechanism 40, it will not be described again here; and the second precision cutting mechanism 44 is a mirror image of the first precision cutting mechanism 42, and its working principle is also the same as that of the first precision cutting mechanism 42, so it will not be described again here.

[0088] like Figure 28 As shown, the first conveying mechanism 46 specifically includes a first conveying bracket 460 disposed on one side of the pre-cutting mechanism 40, the first precision cutting mechanism 42, and the second precision cutting mechanism 44 along the second direction D2, and a first conveying robot 462 slidably connected to the first conveying bracket 460. Driven by the first conveying drive motor 466, the first conveying robot 462 can move back and forth along the first direction D1. The first conveying robot 462 has a suction cup assembly 4620 with its suction port facing downwards and a vacuuming device (not shown) connected to the suction cup assembly 4620. By evacuating a vacuum through the vacuuming device (not shown), the suction cup assembly 4620 generates an adsorption force on the soft-pack battery 10, thereby realizing the picking and placing of the soft-pack battery 10.

[0089] Furthermore, the first transfer manipulator 462 is also equipped with a lifting cylinder (not shown) that can drive the suction cup assembly 4620 to move up and down in the vertical direction, so as to realize the first transfer manipulator 462 moving back and forth between different functional mechanisms without causing motion interference.

[0090] Since the battery body 10a has side edges 10d left after the airbag bag 10b is removed, the electrolyte inside the soft-pack battery 10 will leak out from the opposite side edges 10d. Therefore, it is necessary to fold and heat the side edges 10d. In order to fold and heat the soft-pack battery 10 after it has been cut, the above-mentioned soft-pack battery secondary packaging production line also includes a folding and heat-heating device 5 located downstream of the cutting device 4.

[0091] like Figures 29-35 As shown, the first folding mechanism 51 includes a first folding clamp 510 and first folding assemblies 512 disposed on opposite sides of the first folding clamp 510 along the second direction D2. The first folding clamp 510 is generally rectangular, and its two side walls along the second direction D2 have folding surfaces 510a extending outward. The outer side wall of the first folding clamp 510 located below the folding surfaces 510a is provided with a folding groove 510b extending along the first direction D1, wherein the angle between the side wall of the folding groove 510b near the folding surfaces 510a and the folding surfaces 510a is an acute angle. Each set of first folding components 512 includes a first folding bracket 5120, a first folding drive cylinder 5121 disposed on the first folding bracket 5120, a folding mounting plate 5127 fixedly connected to the movable rod of the first folding drive cylinder 5121, a folding clamping plate 5123 elastically connected to the folding mounting plate 5127, a second folding drive cylinder 5122 disposed on the folding mounting plate 5127, and a first folding pressure plate 5124 fixedly connected to the movable rod of the second folding drive cylinder 5122. The movable rod of the first folding drive cylinder 5121 is vertically downward to drive the folding clamping plate 5123 to move up and down vertically. The folding clamping plate 5123 is generally rectangular and is located directly above the folding cross-section 510a. The top of the folding clamping plate 5123 is elastically connected to the folding mounting plate 5127 via a spring (not shown). When the first folding drive cylinder 5121 drives the folding clamping plate 5123 to move downward, the folding clamping plate 5123 can press the soft-pack battery side 10d on the folding cross-section 510a. The first folding pressure plate 5124 is generally L-shaped, and the end that contacts the soft-pack battery side 10d is a push end, which can engage with the folding groove 510b of the first folding clamp 510. The movable rod of the second folding drive cylinder 5122 is parallel to the second direction D2 to drive the first folding pressure plate 5124 to move back and forth along the second direction D2.

[0092] When folding the edge, Figure 2-3The pouch battery 10 is placed horizontally on the first folding clamp 510, with its side 10d positioned on the folding surface 510a of the clamp 510. The first folding drive cylinder 5121 drives the folding pressing plate 5123 to move downwards vertically. When the pressing plate 5123 abuts against the pouch battery side 10d on the folding surface 510a, it presses the side 10d firmly. Subsequently, the pushing end of the first folding plate 5124, which continues to move downwards, pushes the portion of the pouch battery side 10d protruding from the folding surface 510a downwards, bending it 90° downwards parallel to the outer wall of the first folding clamp 510. Next, the second folding drive cylinder 5122 drives the first folding pressure plate 5124 to move along the first direction D1 toward the first folding clamp 510, so as to push the portion of the soft-pack battery side 10d parallel to the outer wall of the first folding clamp 510, making it fit against the inner wall of the folding groove 510b, forming a bent structure. In this way, the soft-pack battery side 10d has a... Figure 36 The first fold angle α1. Since the angle between the side wall of the folded groove 510b near the folded cross surface 510a and the folded cross surface 510a is an acute angle, the first fold angle α1 formed is also an acute angle (i.e., 0 < α1 < 90°).

[0093] The more bends on the side 10 of the pouch battery, the greater the resistance to electrolyte flow and the better the sealing effect. Therefore, the side 10d of the pouch battery is relatively long, so that when the portion of side 10d protruding from the folding surface 510a is bent at 90°, it completely covers the folding groove 510b. To increase the number of bends formed after folding the pouch battery 10, the cross-section of the folding groove 510b perpendicular to the first direction D1 is triangular, and the apex angle of this triangle is <α1+90°. Thus, after folding, a structure like... Figure 37 The bending structure shown has a first bend angle α1 and a second bend angle α2, wherein 0 < α1 < 90° and 0 < α2 < α1 + 90°. Furthermore, the cross-section of the bend groove 510b perpendicular to the first direction D1 can also be as shown... Figure 38 The trapezoid shown has a minimum included angle (i.e., 0 < α1 < 90°) between the side wall of the trapezoidal folded groove 510b away from the folded cross surface 510a and the plane parallel to the folded cross surface 510a.

[0094] Furthermore, to prevent the folding mounting plate 5127 from shifting during downward movement, the aforementioned first folding mechanism 51 further includes a first folding guide rail 5125 mounted on the first folding bracket 5120 and a first folding slider 5126 that cooperates with the first folding guide rail 5125. Specifically, the first folding guide rail 5125 extends vertically, the first folding slider 5126 is slidably connected to the first folding guide rail 5125, and the folding clamping plate 5123 is fixedly connected to the first folding guide rail 5125. Thus, the cooperation of the first folding guide rail 5125 and the first folding slider 5126 guides the movement of the folding clamping plate 5123, ensuring that the folding clamping plate 5123 does not shift during movement.

[0095] like Figure 38 As shown, the first edge-heating mechanism 52 includes a first edge-heating clamp 520 and first edge-heating assemblies 522 disposed on opposite sides of the first edge-heating clamp 520 along the second direction D2. The first edge-heating clamp 520 is generally rectangular, and positioning blocks 520a for positioning the battery body 10a are provided on both sides along the first direction D1. Each set of first edge-heating assemblies 522 includes a first edge-heating bracket 5220, a first edge-heating drive cylinder 5221 disposed on the first edge-heating bracket 5220, a first edge-heating heating block 5222 fixedly connected to the movable rod of the first edge-heating drive cylinder 5221, and a second edge-heating block 5223 disposed directly below the first edge-heating block 5222 and located outside the first edge-heating clamp 520. Both the first edge-heating block 5222 and the second edge-heating block 5223 are connected to a heating source (such as a heating tube, heating wire, or heating plate) to generate heat.

[0096] During the edge-sealing process, the soft-pack battery 10 is placed on the first edge-sealing fixture 520, with its bent side 10d positioned on the top surface of the second edge-sealing heating block 5223. The first edge-sealing drive cylinder 5221 drives the first edge-sealing heating block 5222 to move vertically toward the second edge-sealing heating block 5223. The first edge-sealing heating block 5222 and the second edge-sealing heating block 5223 flatten the bent side 10d into an "I" shape. At the same time, the first edge-sealing heating block 5222 and the second edge-sealing heating block 5223 generate heat to seal the side 10d of the soft-pack battery.

[0097] The first folding mechanism 51 increases the bending angle of the soft-pack battery side 10d by more than 90°, so that the soft-pack battery side 10d has a first fold angle with an acute angle. Then, the first hot-pressing mechanism 52 folds the soft-pack battery side 10d (equivalent to folding the side 10d 180°). In this way, the flow path of the electrolyte in the soft-pack battery 10 is cut off, the sealing effect is improved, and leakage is reduced.

[0098] In order to transport the pouch battery 10 to the first hot-pressing mechanism 52 located downstream of the first folding mechanism 51 along the first direction D1, and to ensure that the bending structure of the pouch battery side 10d is not damaged, the folding and hot-pressing device 5 also includes a first conveying mechanism 46. The first conveying mechanism 46 is used to move the pouch battery 10 located on the first folding fixture 510 to the first hot-pressing fixture 520; after completion, the first conveying mechanism 46 then transfers the pouch battery 10 to the next functional mechanism.

[0099] Specifically, such as Figure 39 As shown, the first conveying mechanism 46 includes a second conveying manipulator 464 slidably connected to the first conveying bracket 460. Driven by the second conveying drive motor 466, the second conveying manipulator 464 can move back and forth along the first direction D1. The second conveying manipulator 464 has a horizontally arranged adsorption plate 4640. A first conveying limiting block 4640a is provided on the upstream side of the adsorption plate 4640 along the first direction D1. Its bottom has an adsorption through-hole (not shown) connected to a vacuuming device. By drawing a vacuum through the vacuuming device (not shown), an adsorption force is generated on the soft-pack battery 10 through the adsorption through-hole, thereby realizing the picking and placing of the soft-pack battery 10.

[0100] When the first conveying mechanism 46 is working, the adsorption plate 4640 of the second conveying robot 464 adsorbs the battery body 10a through the adsorption through hole (not shown in the figure). At the same time, the first conveying limiting block 4640a abuts against one side of the battery body 10a along the first direction D1, and then drives the soft-pack battery 10 to move in the horizontal direction until the soft-pack battery 10 is completely separated from the first folding clamp 510.

[0101] To facilitate the second conveying robot 464 in directly and horizontally moving the pouch battery 10 onto the first edge-heating fixture 520, and to ensure that its bent side 10d can be placed on the top surface of the second edge-heating block 5223, the aforementioned first edge-folding mechanism 51 further includes a first edge-folding lifting assembly 514. For example... Figure 33 As shown, the first hemming lifting assembly 514 includes a first hemming lifting cylinder 5140 disposed below the first hemming clamp 510. The movable rod of the first hemming lifting cylinder 5140 is vertically upward and fixedly connected to the bottom of the first hemming clamp 510 to drive the first hemming clamp 510 to move in the vertical direction.

[0102] After the first folding is completed, the first folding lifting cylinder 5140 drives the first folding clamp 510 to rise, so that the height of the first folding clamp 510 is higher than the height of the second heating block 5223. Thus, when the second conveying robot 464 moves the soft-pack battery 10 to the first heating mechanism 52, the bent side 10d of the soft-pack battery 10 can be placed on the top surface of the second heating block 5223, facilitating the heating of the side 10d. Preferably, the first folding lifting assembly 514 further includes a first folding guide shaft 5141 and a first folding guide cylinder 5142 that cooperates with the first folding guide shaft 5141. The first folding guide shaft 5141 is parallel to the movable rod of the first folding lifting cylinder 5140, and is fixedly connected to the first folding clamp 510, and is sleeved on the outside of the first folding guide shaft 5141. The first folding guide shaft 5141 and the first folding guide cylinder 5142 work together to guide the first folding fixture 510, ensuring that the first folding fixture 510 will not deviate during the lifting and lowering process.

[0103] Because the corners of the sides are prone to stress concentration during folding and hot-pressing, they are easily damaged. Once damaged, the electrolyte inside the battery can easily leak out from the corners. To reinforce the corners of the side 10d, as an option, the aforementioned folding and hot-pressing device 5 also includes a corner sealing mechanism 50 located upstream of the first folding mechanism 51. Since corner sealing is prior art, the specific structure and working principle of the corner sealing mechanism will not be described in detail here.

[0104] Specifically, such as Figures 40-42 As shown, the second folding mechanism 53 includes a second folding clamp 530 and two sets of second folding assemblies 532 disposed on opposite sides of the second folding clamp 530 along the second direction D2. The second folding clamp 530 is generally rectangular, and positioning blocks 530a for limiting the position of the battery body 10a are provided on opposite sides along the first direction D1. Each set of second folding assemblies 532 includes a second folding bracket 5320, a third folding drive cylinder 5321 disposed on the second folding bracket 5320, and a second folding pressure plate 5322 fixedly connected to the third folding drive cylinder 5321. The side of the second folding pressure plate 5322 near the second folding clamp 530 forms a pushing surface 5322a that is inclined from the inside to the outside.

[0105] In use, the pouch battery 10 is placed on the second folding clamp 530, with both sides of the pouch battery 10 facing the two second folding pressure plates 5322. During the second folding, the third folding drive cylinders 5321 on both sides drive the second folding pressure plates 5322 to move towards the second folding clamp 530. The pushing surface 5322a of the second folding pressure plate 5322 abuts against the side 10d of the pouch battery and drives the side to bend downward until it fits against the pushing surface 5322a of the second folding pressure plate 5322, so that there is an acute angle between the side 10d of the pouch battery and the battery body 10a.

[0106] Furthermore, the second folding assembly 532 also includes folding heating blocks 5323 disposed on opposite sides of the second folding clamp 530 along the second direction D2 and located directly below the second folding pressure plate 5322. The folding heating block 5323 has an upwardly extending protrusion 5323a, the side of which faces the second folding pressure plate 5322 being an inclined surface that matches the pushing surface 5322a. The pushing surface 5322a of the second folding pressure plate 5322 pushes the soft-pack battery side 10d downward to bend into contact with the protrusion 5323a of the folding heating block 5323, and the folding heating block 5323 heats and seals the bend formed by the first folding by heating.

[0107] like Figure 43 As shown, the second edge-heating mechanism 54 includes a second edge-heating clamp 540 and two sets of second edge-heating assemblies 542 disposed on opposite sides of the second edge-heating clamp 540 along the second direction D2. The second edge-heating clamp 540 is also generally rectangular, and positioning blocks 540a for limiting the position of the battery body 10a are provided on opposite sides along the first direction D1. Each set of second edge-heating assemblies 542 includes a second edge-heating bracket 5420, a second edge-heating drive cylinder 5421 disposed on the second edge-heating bracket 5420, and a third edge-heating heating block 5422 fixedly connected to the second edge-heating drive cylinder 5421. The movable rod of the second edge-heating drive cylinder 5421 is parallel to the second direction D2 and can drive the third edge-heating block 5422 to move back and forth along the second direction D2. The third edge-heating block 5422 is connected to a heating source (such as a heating wire, heating tube, or heating plate), and its side facing the second edge-heating clamp 540 is the heating surface.

[0108] In use, the pouch battery 10 is placed on the second edge-heating fixture 540, with both sides 10d of the pouch battery 10 facing the heating surfaces of the two third edge-heating blocks 5422. During edge-heating, the second edge-heating drive cylinder 5421 drives the third edge-heating blocks 5422 to move towards the second edge-heating fixture 540. After the heating surfaces of the third edge-heating blocks 5422 abut against the bent side of the pouch battery 10, they continue to push it to a side parallel to the battery body 10a.

[0109] Thus, by performing a second folding and a second hot-pressing on the soft-pack battery 10, the bending points on the sides are increased to further improve the sealing effect, while eliminating the protruding side 10d of the soft-pack battery 10, making the outer surface of the soft-pack battery 10 smoother.

[0110] Furthermore, to move the pouch battery located in the second folding mechanism 53 to the second hot-pressing mechanism 54 and ensure that the bending structure of the pouch battery side 10d is not damaged, the aforementioned folding and hot-pressing device 5 also includes a second conveying mechanism 56. The second conveying mechanism 56 is used to move the pouch battery 10 located on the second folding fixture 530 to the second hot-pressing fixture 540; after completion, the second conveying mechanism 56 then transfers the pouch battery 10 to the next functional device. The structure and working principle of the second conveying mechanism 56 are the same as those of the first conveying mechanism 46, so they will not be described again here.

[0111] Similar to the first folding mechanism 51, the second conveying mechanism 56 allows the soft-pack battery 10 to be directly moved horizontally from the second folding clamp 530 to the second hot-pressing clamp 540. The second folding mechanism 53 also includes a second folding lifting assembly 534. Figure 43 As shown, the second hemming lifting assembly 534 includes a second hemming lifting cylinder 5340 disposed below the second hemming clamp 530. The movable rod of the second hemming lifting cylinder 5340 is vertically upward and fixedly connected to the bottom of the second hemming clamp 530 to drive the second hemming clamp 530 to move vertically. Further, to prevent the second hemming clamp 530 from shifting during the lifting process, the second hemming lifting assembly 534 also includes a second hemming guide shaft 5341 and a second hemming guide cylinder 5342 that cooperates with the second hemming guide shaft 5341. The connection relationship and working principle of the second hemming guide shaft 5341 and the second hemming guide cylinder 5342 are the same as those of the first hemming guide shaft 5141 and the first hemming guide cylinder 5142, and therefore will not be described again here.

[0112] After the second folding is completed, the second folding lifting cylinder 5340 drives the second folding fixture 530 to rise, so that the height of the second folding fixture 530 is higher than the height of the second hot-pressing fixture 540. Thus, when the first conveying robot 462 moves the soft-pack battery 10 to the first hot-pressing mechanism 52, the battery body 10 can be placed on the top surface of the second hot-pressing heating block 5223, with its side 10d facing the third hot-pressing heating block 5422, so that the side 10d can be heated and sealed. Here, the second conveying mechanism 56 and the first conveying mechanism 46 can be the same functional mechanism, or they can be different mechanisms. Figure 4 The two different functional mechanisms are shown.

[0113] In actual production, after the second folding and second heat pressing, the side edge 10d often tends to bounce back and lift up. To avoid this, the aforementioned folding and heat pressing device 5 also includes a glue dispensing mechanism 55. The glue dispensing mechanism 55 is located between the first heat pressing mechanism 52 and the second folding mechanism 53, and is used to apply glue between the side edge 10d of the soft-pack battery and the battery body 10a before the second folding. Since the glue dispensing mechanism is existing technology, its specific structure and working principle will not be described in detail here.

[0114] Because the hemming and pressing device 5 includes multiple functional mechanisms, arranging these mechanisms in a straight line would occupy a large amount of space. To reduce the space occupied by the production line and make the layout more rational, such as... Figure 4 As shown, the corner sealing mechanism 50, the first folding mechanism 51, and the first hot-pressing mechanism 52 in the aforementioned folding and hot-pressing device 5 are symmetrically arranged with the second hot-pressing mechanism 54, the second folding mechanism 53, and the glue dispensing mechanism 55 about the first direction D1. This ensures that the direction in which the soft-pack battery 10 moves from the corner sealing mechanism 50 to the first folding mechanism 51 and then to the first hot-pressing mechanism 52 is opposite to the direction in which it moves from the glue dispensing mechanism 55 to the second folding mechanism 53 and then to the second hot-pressing mechanism 54. This shortens the overall length of the production line.

[0115] Furthermore, such as Figure 4 As shown, to transfer the pouch battery 10 from the first hot-pressing mechanism 52 to the dispensing mechanism 55, the aforementioned pouch battery secondary packaging production line also includes a transfer device 6 disposed between the first hot-pressing mechanism 52 and the dispensing mechanism 55. The transfer device 6 includes a transfer sliding assembly (not shown), a transfer platform (not shown) slidably disposed on the transfer sliding assembly, and a transfer driving assembly (not shown) that drives the transfer platform to move back and forth along the second direction D2.

[0116] The transfer sliding assembly (not shown) includes two transfer guide rails parallel to the second direction D2 and a transfer slider that slides in cooperation with the two guide rails. The bottom of the transfer platform is fixedly connected to the two transfer sliders. The transfer drive assembly (not shown) is fixedly connected to the transfer platform to drive the transfer platform to move back and forth along the transfer guide rails. Here, the transfer drive assembly (not shown) can be any structure that drives the linear motion of the transfer platform, such as a linear motor, or it can use the transmission wheel, the transmission belt that cooperates with the transmission belt, and the servo motor included in the lower cavity drive assembly 35 of the aforementioned exhaust device 3, as long as it can drive the transfer platform to move along the second direction D2.

[0117] After the first edge-heating mechanism 52 completes the first edge-heating of the soft-pack battery 10, the transfer platform moves to the downstream position of the first edge-heating fixture 520 along the first direction D1. The first transfer robot 462 moves the soft-pack battery 10 from the first edge-heating fixture 520 to the transfer platform. The transfer platform moves along the second direction D2 towards the dispensing mechanism 55 until it aligns with the dispensing fixture 550 of the dispensing mechanism 55. The second transfer robot moves above the transfer platform and moves the soft-pack battery 10 to the dispensing fixture.

[0118] To prevent the pouch battery 10 on the transfer platform from moving during the transfer process, the transfer platform is also equipped with an adsorption hole (not shown in the figure). The adsorption hole (not shown in the figure) is connected to a vacuum device. By drawing a vacuum, a negative pressure is generated to adsorb the pouch battery 10 placed on the transfer platform.

[0119] Furthermore, the aforementioned soft-pack battery production line also includes a weighing and scanning device 7 and a feeding device 8, which are sequentially arranged downstream of the second hot-pressing mechanism 54. The weighing and scanning device 7 weighs and scans the soft-pack batteries 10, and the feeding device 8 sorts and feeds qualified and unqualified products according to the weighing results.

[0120] Compared to existing technologies, the pouch battery secondary packaging production line of this invention symmetrically arranges multiple exhaust units in pairs in the exhaust device, and achieves rapid feeding by cooperating with the feeding device through the movable lower cavity in each exhaust unit, shortening the moving distance of the feeding device, realizing rapid feeding, improving production efficiency, and reducing the overall footprint of the secondary packaging production line through reasonable layout; furthermore, by sequentially setting the edge cutting device, edge folding and hot pressing device, transfer device, weighing and scanning device and unloading device downstream of the exhaust device, the production of pouch batteries can be automated.

[0121] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and the present invention also intends to include these modifications and variations.

Claims

1. A production line for secondary packaging of soft-pack batteries, characterized in that: It includes a loading platform (1) for placing a soft-pack battery to be vented, an venting device (3) disposed downstream of the loading platform (1) in a first direction, and a loading device (2) for moving a soft-pack battery (10) placed on the loading platform (1) to the venting device (3). The exhaust device (3) includes 2n exhaust units (30) arranged symmetrically about the first direction, where n≥1; The exhaust unit (30) includes an upper cavity mechanism (31) fixed on the exhaust bracket and a lower cavity mechanism (32) disposed directly below the upper cavity mechanism (31). The lower cavity mechanism (32) can be moved from a first position located directly below the upper cavity mechanism (31) along a second direction to a second position. The upper cavity mechanism includes an upper cavity cover that can move up and down in a vertical direction. The upper cavity cover can be moved downward to cover the top of the lower cavity mechanism located in the first position to form a sealed chamber. The second direction is perpendicular to the first direction, and the first position and the second position are located in the same plane. The lower cavity mechanism (32) of the two symmetrically arranged exhaust units (30) can move alternately, such that when one lower cavity mechanism (32) moves from the first position to the second position, the other lower cavity mechanism (32) moves from the second position to the first position, wherein the second position of the two symmetrically arranged exhaust unit lower cavity mechanisms (32) in the movement stroke is the same position; The feeding device (2) includes a first transfer robot and a second transfer robot. The first transfer robot and the second transfer robot are distributed sequentially along the first direction and can move back and forth along the first direction. When the lower cavity mechanism (32) moves from the first position to the second position, the first transfer robot can move the soft-pack battery (10) to be degassed located on the loading platform (1) to the lower cavity mechanism (32) along the first direction, and then the lower cavity mechanism (32) moves from the second position to the first position; And / or, when the lower cavity mechanism (32) moves from the first position to the second position, the second transfer manipulator can remove the vented pouch battery (10) located in the lower cavity mechanism (32) along the first direction, and then the lower cavity mechanism (32) moves from the second position to the first position.

2. The pouch battery secondary packaging production line according to claim 1, characterized in that: It includes four exhaust units (30), which are symmetrically arranged in pairs along the first direction.

3. The pouch battery secondary packaging production line according to claim 1, characterized in that: The exhaust device (3) further includes a lower cavity drive assembly corresponding to the exhaust unit (30). The lower cavity drive assembly is located on one side of the corresponding exhaust unit (30) and is used to drive the lower cavity mechanism (32) to move back and forth between the first position and the second position. The lower cavity driving assembly includes two transmission wheels distributed along the second direction, a transmission belt sleeved on the outer periphery of the two transmission wheels and cooperating with the transmission wheels for transmission, a clamping block that holds the transmission belt and is fixedly connected to the lower cavity base, and a base drive motor that is connected to one of the transmission wheels and drives the transmission wheel to rotate.

4. The pouch battery secondary packaging production line according to claim 1, characterized in that: The upper cavity cover (310) has a downward-facing accommodating cavity (310a), and a bayonet (3100) is provided inside the accommodating cavity (310a). The upper cavity cover (310) moves downward to cover the top of the lower cavity mechanism (32), so that the accommodating cavity (310a) forms a sealed chamber, and the bayonet punctures the airbag of the soft-pack battery. The sealed chamber is connected to a vacuum pumping mechanism.

5. The pouch battery secondary packaging production line according to claim 1, characterized in that: The feeding device (2) includes a feeding bracket (33) extending along the first direction and a transfer manipulator slidably disposed on the feeding bracket; The transfer manipulator has a transfer adsorption component. After the loading adsorption component adsorbs the soft-pack battery, it moves along the first direction to directly above the lower cavity mechanism (32) located in the second position and places the soft-pack battery (10) in the lower cavity mechanism (32).

6. The pouch battery secondary packaging production line according to claim 1, characterized in that: It also includes a cutting device (4) disposed downstream of the exhaust device (3) in the first direction, the cutting device (4) including a pre-cutting mechanism (40) and two fine cutting mechanisms (41), and a first conveying mechanism (46). The pre-cutting mechanism (40) is used to cut off the airbag (10b) of the soft-pack battery (10). The two precision cutting mechanisms (41) are a first precision cutting mechanism (42) and a second precision cutting mechanism (44), respectively. The first precision cutting mechanism (42) and the second precision cutting mechanism (44) are mirror-symmetrical structures. The first precision cutting mechanism (42) and the second precision cutting mechanism (44) are arranged downstream of the pre-cutting mechanism (40) along the first direction to cut the two sides (10d) of the soft-pack battery (10) along the second direction, respectively. The first conveying mechanism (46) is used to move the soft-pack battery (10) sequentially from the pre-cutting mechanism (40) to the first fine-cutting mechanism (42), and then to the second fine-cutting mechanism (44).

7. The pouch battery secondary packaging production line according to claim 6, characterized in that: It includes a folding and heating device (5) disposed downstream of the cutting device (4). The folding and heating device (5) includes a first folding mechanism (51) and a first heating mechanism (52) disposed sequentially downstream of the cutting device (4) along the first direction, and a second folding mechanism (53) and a second heating mechanism (54) disposed sequentially downstream of the first heating mechanism (52) along the first direction. After the first folding mechanism (51) and the first heating mechanism (52) complete the first folding and the first heating of the two sides (10d), the soft-pack battery (10) moves sequentially to the second folding mechanism (53) and the second heating mechanism (54) to perform the second folding and the second heating of the two sides.

8. The pouch battery secondary packaging production line according to claim 7, characterized in that: The direction in which the soft-pack battery (10) moves from the first folding mechanism (51) to the first hot-pressing mechanism (52) is opposite to the direction in which it moves from the second folding mechanism (53) to the second hot-pressing mechanism (54); The edge-folding and ironing device (5) further includes a second conveying mechanism, which is disposed between the first ironing mechanism and the second edge-folding mechanism, for moving the soft-pack battery from the first ironing mechanism to the second edge-folding mechanism.

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