Battery cell slit method and slit device

Abstract

To provide battery cell slit method and slit device.SOLUTION: A method includes the steps of controlling a pressing plate to press a stacked unit 300 against a battery cell support base, in which the stacked unit 300 includes m×n positive electrode sheets, m×n negative electrode sheets, and a separator 400, the m×n positive electrode sheets and the m×n negative electrode sheets are alternately stacked on the continuously laminated separator 400, and the m×n positive electrode sheets and the m×n negative electrode sheets are distributed in m rows and n columns to form m×n battery cell assemblies 310 in the stacking direction, m is a positive integer greater than or equal to 1 and n is a positive integer greater than or equal to 2, and controlling the slit device to slit the multiple layers of separator 400 of the stacked unit along preset slit lines to obtain m×n independent battery cell assemblies.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present application relates to the technical field of lithium ion batteries, and in particular to a method and apparatus for slitting battery cells. [Background technology]

[0002] In the related art, a battery cell is the core component of a battery, and a lithium-ion battery cell is formed by stacking multiple layers of electrode sheets and separators between the electrode sheets. Conventional stacking methods require alternating stacking of positive and negative electrode sheets, with separators between the positive and negative electrode sheets. Conventional stacking devices stack the positive and negative electrode sheets one by one, resulting in low production efficiency. After stacking, the separators must be cut from the stacked battery cell body. To ultimately form a lithium-ion battery cell with a consistent thickness, conventional slitting devices only cut the single-layer end separators of each battery cell. This results in low slitting efficiency. Summary of the Invention [Problem to be solved by the invention]

[0003] The embodiments of the present application provide a battery cell slitting method and device that aim to solve the problem of low slitting efficiency of conventional battery cells. [Means for solving the problem]

[0004] The present application provides a method for slitting a battery cell, the method comprising: a step of controlling a pressing plate to press the stacking unit against a battery cell support base, the stacking unit including m×n positive electrode sheets, m×n negative electrode sheets, and a separator, the m×n positive electrode sheets and the m×n negative electrode sheets being alternately stacked on the continuously laminated separator, and the m×n positive electrode sheets and the m×n negative electrode sheets being distributed in m rows and n columns to form m×n battery cell bodies in the stacking direction, where m is a positive integer of 1 or more and n is a positive integer of 2 or more; and controlling a slitting device to slit the multiple layers of separators of the stacked unit according to a preset slit line to obtain m×n individual battery cell assemblies.

[0005] The present application further provides a slitting device applicable to the above-mentioned battery cell slitting method, the slitting device being a cold cutting device, the cold cutting device comprising: The frame and a battery cell support base provided on the frame and used to place the stacked unit; a positioning mechanism provided on the frame, including a pressing plate, and used to drive the pressing plate to press the stacked unit against the battery cell support base; a cold cutting mechanism mounted on the frame and including a slitting blade and a translational drive module for driving the slitting blade to move in a translational manner;

[0006] The present application further provides a slitting device applicable to the above-mentioned battery cell slitting method, the slitting device being a hot cutting device, the hot cutting device comprising: The frame and a battery cell support base provided on the frame and used to place the stacked unit; a positioning mechanism provided on the frame, including a pressing plate, and used to drive the pressing plate to press the stacked unit against the battery cell support base; The hot cutting mechanism is provided on the frame and includes a hot cutting line and an elevation drive module for driving the hot cutting line to move up and down. [Effects of the Invention]

[0007] Compared to conventional slitting devices that use a method of cutting a single-layer end separator of a single battery cell, the slitting device of the present application slits the stacked unit along a predetermined slit line, thereby simultaneously cutting multiple layers of separators to obtain m × n independent battery cell bodies, significantly improving slitting efficiency and improving battery cell production efficiency. [Brief explanation of the drawings]

[0008] In order to more clearly describe the technical solutions of the embodiments of the present application, the following will briefly describe the drawings necessary for describing the embodiments. It is obvious that the drawings in the following description are only a part of the embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without any creative work.

[0009] [Figure 1] 1 is a flowchart of steps of a battery cell slitting method according to an embodiment of the present application. [Figure 2] 1 is a schematic diagram of a battery cell slitting method employing a cold cutting device according to an embodiment of the present application. [Figure 3] FIG. 10 is a schematic diagram of a battery cell slitting method employing a cold cutting device according to another embodiment of the present application. [Figure 4] 1 is a schematic diagram of a battery cell slitting method employing a hot cutting device according to an embodiment of the present application. [Figure 5] FIG. 10 is a schematic diagram of a battery cell slitting method employing a hot cutting device according to another embodiment of the present application. [Figure 6] 1 is a schematic front view of a cold cutting device according to an embodiment of the present application; [Figure 7] 1 is a schematic plan view of a cold cutting device according to an embodiment of the present application; [Figure 8]1 is a schematic three-dimensional view of a cold cutting device according to an embodiment of the present application; [Figure 9] 1 is a schematic front view of a hot cutting device according to an embodiment of the present application. [Figure 10] 1 is a schematic plan view of a hot cutting device according to an embodiment of the present application; [Figure 11] 1 is a schematic three-dimensional view of a hot cutting device according to an embodiment of the present application; [Figure 12] FIG. 11 is an enlarged view of part A in FIG. [Figure 13] FIG. 11 is an enlarged view of part B in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Referring to FIG. 1, FIG. 1 is a flow chart of steps of a battery cell slitting method provided in an embodiment of the present application, which includes steps S1 and S2.

[0011] In S1, the pressing plate is controlled to press the stacked unit 300 against the battery cell support base, where the stacked unit 300 includes m×n positive electrode sheets, m×n negative electrode sheets, and a separator 400, where the m×n positive electrode sheets and the m×n negative electrode sheets are alternately stacked on the continuously laminated separator 400, and the m×n positive electrode sheets and the m×n negative electrode sheets are distributed in m rows and n columns to form m×n battery cell bodies 310 in the stacking direction, where m is a positive integer greater than or equal to 1 and n is a positive integer greater than or equal to 2.

[0012] In this embodiment, the stacked unit 300 is a unit consisting of a plurality of connected battery cell assemblies 310 formed by alternately stacking positive electrode sheets and negative electrode sheets on a separator 400 formed by successively laminating the positive electrode sheets and the negative electrode sheets. The process for obtaining the stacked unit 300 is specifically as follows: A separator assembly covers a first layer of separator 400 on a stacking table, and m×n positive electrode sheets are placed on the first layer of separator 400 in an m-row, n-column arrangement. The separator assembly then covers a second layer of separator 400 on the m×n positive electrode sheets, and m×n negative electrode sheets are placed on the second layer of separator 400 in an m-row, n-column arrangement. This completes one stacking of positive electrode sheets and negative electrode sheets. The above stacking step of positive electrode sheets and negative electrode sheets is repeated until a predetermined number of stacks is reached, and the stacked unit 300 is finally obtained. Here, the separators 400 are continuously laminated in a Z-shape by the separator assembly, and positive and negative electrode sheets are stacked on the top and bottom sides of each separator 400, respectively, with the positive and negative electrode sheets separated by the separator 400. The positive and negative electrode sheets stacked at the same position in the stacking direction and the multiple layers of separators 400 separating the positive and negative electrode sheets form a single battery cell body 310. In this way, the positive and negative electrode sheets are stacked in m rows and n columns, so that one stack unit 300 consists of m × n battery cell bodies 310 distributed in m rows and n columns. Here, m is a positive integer greater than or equal to 1, and n is a positive integer greater than or equal to 2. There are multiple ways to distribute the battery cells in m rows and n columns. Illustratively, the m rows and n columns may be one row and five columns, i.e., five battery cell assemblies 310 distributed in parallel with a space between them in the horizontal direction. Illustratively, the m rows and n columns may be two rows and three columns, i.e., divided into two rows, with three battery cell assemblies 310 distributed in parallel with a space between them in each row, for a total of six battery cell assemblies 310.

[0013] The battery cell support base is used to place the stacked unit 300, which is placed flat on the flat surface of the battery cell support base. A pressure plate presses the stacked unit 300, making it adhere to the battery cell support base and achieving pressing and positioning of the stacked unit 300. This prevents misalignment when the slitting device slits, reduces the reject rate, and improves reliability.

[0014] In S2, a slitting device is controlled to slit the separator layers of the stacked unit 300 along preset slit lines to obtain m×n individual battery cell assemblies 310.

[0015] In this embodiment, the slitting device is a device that cuts one entire stack unit 300 into a plurality of independent battery cell assemblies 310. The predetermined slit lines are set based on the stacking arrangement of the stack unit 300, i.e., the predetermined slit lines are set based on an m-row, n-column distribution. The predetermined slit lines are set based on the gap between adjacent battery cell assemblies 310 on the left and right or between adjacent battery cell assemblies 310 on the top and bottom. For example, if the gap distance is D, the predetermined slit line is located at 1 / 2 of D.

[0016] In one specific embodiment, when m=1, i.e., when there is only one row of battery cell bodies 310, the predetermined slit lines include j vertical slit lines 501 between the horizontally adjacent battery cell bodies 310, where j=n-1. Specifically, when there is only one row of battery cell bodies 310, there are only vertical slit lines 501, and the battery cell bodies 310 in one row are arranged in parallel with a gap between them, with one vertical slit line 501 between every two horizontally adjacent battery cell bodies 310. Therefore, when there are n battery cell bodies 310, there are j vertical slit lines 501, i.e., j=n-1. For example, when there are five battery cell bodies 310 arranged in parallel with a gap between them, there are four vertical slit lines 501.

[0017] In another specific embodiment, m is an integer greater than 1, i.e., there are at least two rows of battery cell bodies 310, and the predetermined slit lines include k horizontal slit lines 502 between vertically adjacent battery cell bodies 310, where k = m - 1. Specifically, when there are at least two rows of battery cell bodies 310, the predetermined slit lines include not only vertical slit lines 501 but also horizontal slit lines 502, with one horizontal slit line 502 provided between every two vertically adjacent rows of battery cell bodies 310. Therefore, when there are m rows of battery cell bodies 310, there are k horizontal slit lines 502, i.e., k = m - 1. For example, when there are two rows of battery cell bodies 310, there is one horizontal slit line 502. The vertical slit lines 501 are used to slit the separator 400 between two horizontally adjacent battery cell bodies 310, and the horizontal slit lines 502 are used to slit the separator 400 between two rows of battery cell bodies 310 one above the other. When there are at least two rows of battery cell bodies 310, the vertical slit lines 501 extend downward from between two horizontally adjacent battery cell bodies 310 in the first row to between two horizontally adjacent battery cell bodies 310 in the next row. The horizontal slit lines 502 are provided between the two rows of battery cell bodies 310 one above the other, and extend horizontally from one side of the stack unit 300 to the other, intersecting each of the vertical slit lines 501.

[0018] The slitting device may be a cold cutting device 100 or a hot cutting device 200, and the slitting device has a cutting member that advances along a predetermined slit line, advancing from the start point of the predetermined slit line to the end point of the predetermined slit line, thereby slitting one entire stacked unit 300 into a plurality of independent battery cell bodies 310 and completing the slitting of the stacked unit 300.

[0019] The number of cutting members in the slitting device may be one or more. When there is one cutting member, the one cutting member may cut back and forth along the predetermined slit line. For example, when the predetermined slit line includes four vertical slit lines 501, one cutting member may start cutting from the first vertical slit line 501, and after completing cutting the first vertical slit line 501, cut the second vertical slit line 501, and stop until all four vertical slit lines 501 are cut. When there are multiple cutting members, the multiple cutting members may simultaneously cut along the predetermined slit line at one time. For example, when the predetermined slit line includes four vertical slit lines 501 and there are four cutting members, the four cutting members simultaneously cut the four vertical slit lines 501 respectively, thereby completing cutting along all the predetermined slit lines at one time and eliminating the need for multiple reciprocating cuts.

[0020] Furthermore, compared to the conventional method in which a slitting device cuts the single-layer terminal separator 400 of a single battery cell, in this embodiment, due to the special stacking structure of the stacking unit 300, the cutting member cuts from the middle of the continuously laminated multi-layer separator 400 without cutting the single-layer terminal separator 400. Therefore, the cutting member can slit the multi-layer separator 400 at once, which greatly improves slitting efficiency compared to the method in which a single-layer terminal separator 400 is cut.

[0021] In this embodiment, the stack unit 300 is first pressed against the battery cell support base by a pressure plate to position it, and then the stack unit 300 is slit along a predetermined slit line using a slitting device, allowing the multiple layers of separator 400 between the multiple connected battery cell assemblies 310 in the stack unit 300 to be slit simultaneously, resulting in multiple independent battery cell assemblies 310. This significantly improves slitting efficiency, enables the simultaneous production of multiple battery cells, and significantly improves battery cell production efficiency.

[0022] 2 and 3 , in one embodiment, when the slitting device is a cold-cutting device 100, step S2 includes controlling the slitting blade of the cold-cutting device 100 to translate from one side edge of the laminated unit 300 along the predetermined slit line to cut the multiple layers of separator 400 to the other side edge of the laminated unit 300, thereby slitting the laminated unit 300 into m×n individual battery cell assemblies 310. Specifically, the cold-cutting device 100 is a mechanical cutting device using a cutting tool, and the cold-cutting device includes a slitting blade, which may be a sawtooth rotating blade or may have other structures, and is not limited thereto. The slitting blade uses a translational cutting method, proceeding from one horizontal side of the laminated unit 300, i.e., the positive electrode tab side, toward the longitudinal slit line 501, and then translating along the longitudinal slit line 501 to the other horizontal side of the laminated unit 300, i.e., the negative electrode tab side, and exiting. Alternatively, the slitting blade may proceed from the horizontal left side of the stacked unit 300 toward the horizontal slit line 502, translate along the horizontal slit line 502, and proceed to the horizontal right side of the stacked unit 300 to exit. The number of slitting blades may be one or more, and in this embodiment, the number of slitting blades is multiple. When m=1, i.e., when there is only one row of battery cell assemblies 310, the number of slitting blades is j, and each slitting blade cuts one corresponding vertical slit line 501. The multiple slitting blades simultaneously translate to cut the stacked unit 300, allowing the multiple layers of separators 400 of multiple connected battery cell assemblies 310 to be slit at once to obtain multiple independent battery cell assemblies 310, thereby improving slitting efficiency.When m is an integer greater than 1, i.e., there are at least two rows of battery cell assemblies 310, the number of slit blades is k+j, and j slit blades cut j vertical slit lines 501 correspondingly, and k slit blades cut k horizontal slit lines 502 correspondingly. First, the j slit blades move in translation simultaneously to cut the j vertical slit lines 501, and then the k slit blades move in translation simultaneously to cut the k horizontal slit lines 502. This allows the multiple layers of separators 400 of multiple connected battery cell assemblies 310 to be slit at once to obtain multiple independent battery cell assemblies 310, thereby improving slitting efficiency.

[0023] In another embodiment, after step S2, step S3 of packaging the separators 400 on the sides of the battery cell body 310 may be further included. Specifically, slitting the stacked unit 300 using the cold cutting device 100 simultaneously cuts multiple layers of separators 400, and the cut openings of the separators 400 on the sides of the obtained independent battery cell body 310 are exposed and require further packaging. Specifically, a hot press packaging process may be used, although other packaging processes may also be used and are not limited thereto.

[0024] 4 and 5 , in one embodiment, when the slitting device is a hot cutting device 200, step S2 includes controlling the hot cutting line of the hot cutting device 200 to move upward from the lower side of the stacked unit 300 along the predetermined slit line to the upper side of the stacked unit 300 to cut the multiple layers of separators 400 and slit the stacked unit 300 into m×n individual battery cell assemblies 310. Specifically, the hot cutting device 200 is a device that uses high-temperature cutting and includes a hot cutting line that is a long, linear member that can be heated to a high temperature for cutting. Of course, other structures may also be used and are not limited herein. The length of the hot cutting line is longer than the length of the predetermined slit line, and the hot cutting line is arranged along the predetermined slit line. For example, if the predetermined slit line is a vertical slit line 501, the hot cutting line is arranged along the vertical direction and is located directly above or below the vertical slit line 501. Similarly, for example, if the predetermined slit line is the horizontal slit line 502, the hot-cutting line is arranged along the horizontal direction and is located directly above or below the horizontal slit line 502. The hot-cutting line employs an up-and-down cutting method, moving upward from the vertically lower side of the stacked unit 300, passing through the vertical slit line 501 or the horizontal slit line 502, and then moving upward to the vertically upper side of the stacked unit 300 before exiting. Alternatively, a method from top to bottom may be used, and this is not limited thereto. The number of hot-cutting lines may be one or more, and in this embodiment, there are multiple hot-cutting lines. When m=1, i.e., when there is only one row of battery cell bodies 310, the number of hot-cutting lines is j, and each hot-cutting line cuts one corresponding longitudinal slit line 501. The multiple hot-cutting lines simultaneously translate to cut the stacked unit 300, and the multiple layers of separators 400 of the multiple connected battery cell bodies 310 can be slit at once to obtain multiple independent battery cell bodies 310, improving slitting efficiency.When m is an integer greater than 1, i.e., when there are at least two rows of battery cell assemblies 310, the number of hot-cutting lines is k+j, and the j hot-cutting lines correspondingly cut the j vertical slit lines 501, and the k hot-cutting lines correspondingly cut the k horizontal hot-cutting lines 502. First, the j hot-cutting lines move up and down simultaneously to cut the j vertical slit lines 501, and then the k hot-cutting lines move up and down simultaneously to cut the k horizontal slit lines 502. This allows the multiple layers of separators 400 of multiple connected battery cell assemblies 310 to be slit at once, obtaining multiple independent battery cell assemblies 310 and improving slitting efficiency.

[0025] 6 to 8, an embodiment of the present invention further provides a slitting device that can be applied to the battery cell slitting method of the above embodiment. The slitting device is a cold-cutting device 100, which includes a frame 110, a battery cell support base 120, a positioning mechanism 130, and a cold-cutting mechanism 140. The battery cell support base 120 is mounted on the frame 110 and is used to place the stacked unit 300. The positioning mechanism 130 is mounted on the frame 110 and includes a pressing plate 131 that is used to drive the pressing plate 131 to press the stacked unit 300 against the battery cell support base 120. The cold-cutting mechanism 140 is mounted on the frame 110. The cold-cutting mechanism 140 includes a slitting blade 141 and a translational drive module that is used to drive the slitting blade 141 to move in a translational manner.

[0026] Specifically, the battery cell support base 120, positioning mechanism 130, and cold-cutting mechanism 140 are all mounted on a frame 110, which serves as a support member to support each of these functional mechanisms. The positioning mechanism 130 is located above the battery cell support base 120 and includes a pressure plate 131 and an air cylinder 132. The frame 110 also includes a gantry 111 mounted above the battery cell support base 120. The air cylinder 132 is fixed to the gantry 111 and supports the air cylinder 132, which is spaced a certain height from the battery cell support base 120. The pressure plate 131 is connected to a movable end of the air cylinder 132, and the movable end of the air cylinder 132 extends and retracts toward the battery cell support base 120, driving the pressure plate 131 to press down or retract. Here, the number of pressure plates 131 is the same as the number of battery cell bodies 310 in the stack unit 300, and the multiple pressure plates 131 are connected via one connecting plate 133. The air cylinder 132 drives the connecting plate 133 to move each pressure plate 131 synchronously, and each pressure plate 131 presses one corresponding battery cell body 310, with gaps left between adjacent pressure plates 131 to avoid interference with the slits of the slit device. The extension of the air cylinder 132 drives the pressure plate 131 to press down, pressing the corresponding battery cell body 310 against the battery cell support base 120. Each battery cell body 310 is provided with a pressure plate 131 that presses and positions it. When the slitting device slits, each battery cell body 310 is pressed against the pressure plate 131, so the battery cell body 310 remains fixed. This allows the slitting device to slit accurately along the specified slit line, avoiding misalignment during slitting, reducing the defect rate, and improving reliability.

[0027] In one embodiment, the translational drive module includes a slide rail 142 and a slide carrier 143, and the plurality of slitting blades 141 are attached to the slide carrier 143, and the slide carrier 143 slides along the slide rail 142 to drive the translation of the slitting blades 141. Specifically, the slide rail 142 is installed above the gantry 111, and the slide carrier 143 is attached to the slide rail 142 and driven by a motor, so that the slide carrier 143 can slide along the slide rail 142. The plurality of slitting blades 141 are attached to the slide carrier 143 via a connection base 144, and a plurality of connection portions 145 extend downward from the connection base 144, and each connection portion 145 is connected to a corresponding one of the slitting blades 141, so that the slitting blades 141 can extend until their lower cutting edges are positioned on the upper surface of the battery cell support base, thereby cutting the stack unit 300 pressed against the battery cell support base. The multiple slit blades 141 are spaced apart, and each slit blade 141 is positioned exactly in the gap between adjacent gantries 111 and is not interfered with by the gantries 111. The distance between adjacent slit blades 141 is constant, and the distance between two adjacent slit blades 141 is equal to the distance between the predetermined slit lines. For example, if there are two predetermined slit lines, the number of slit blades 141 is two, and the distance between the two predetermined slit lines is 10 mm, then the distance between the two slit blades 141 is also 10 mm, and the two correspond to each other.As shown in FIG. 7 , in this embodiment, the specified slit lines are four vertical slit lines 501, and four slit blades 141 are also provided. When slitting, the air cylinder 132 first drives the four pressure plates 131 to press down, thereby pressing against each of the four connected battery cell assemblies 310 of the stack unit 300. The motor then drives the slide carriers 143 to slide along the slide rails 142, and the slit blades 141 move forward and translate through the gaps between adjacent gantries 111. Specifically, the slide carriers 143 drive the four slit blades 141 to move from one horizontal side of the stack unit 300, i.e., the positive electrode tab side, toward the vertical slit lines 501, and then translate along the vertical slit lines 501 until they emerge from the other horizontal side of the stack unit 300, i.e., the negative electrode tab side. This allows translational movement of multiple slitting blades 141, simultaneously cutting multiple layers of separators 400 of connected battery cell assemblies 310, improving slitting efficiency.

[0028] 9 to 13, another embodiment of the present invention further provides a slitting device that can be used in the battery cell slitting methods of the above embodiments. The slitting device is a hot-cutting device 200, and the hot-cutting device 200 includes a frame 210, a battery cell support base 220, a positioning mechanism 230, and a hot-cutting mechanism. The battery cell support base 220 is mounted on the frame 210 and is used to place the stacked unit 300. The positioning mechanism 230 is mounted on the frame 210 and includes a pressing plate 231 that is used to drive the pressing plate 231 to press the stacked unit 300 against the battery cell support base 220. The hot-cutting mechanism 240 is mounted on the frame 210 and includes a hot-cutting wire 243 and a lifting drive module that is used to lift and lower the hot-cutting wire 243.

[0029] Specifically, the battery cell support base 220, positioning mechanism 230, and hot cutting mechanism are all mounted on a frame 210, which serves as a support member to support each of these functional mechanisms. The positioning mechanism 230 is located above the battery cell support base 120 and includes a pressure plate 231 and an air cylinder 232. The frame 210 is an overall rectangular support frame, with an upper bracket plate 211 mounted on the upper side of the support frame and a bottom bracket plate 212 mounted on the lower side of the support frame. The air cylinder 232 is fixed to the upper bracket plate 211. The battery cell support base 220 is mounted within the support frame, and the battery cell support base 220 is plate-shaped. The air cylinder 232 is spaced a certain height from the battery cell support base 220. The pressure plate 231 is connected to the movable end of the air cylinder 232. The movable end of the air cylinder 232 extends and retracts toward the battery cell support base 220, driving the pressure plate 231 to press down or retract. Here, the number of pressure plates 231 is the same as the number of battery cell bodies 310 in the stack unit 300, and the multiple pressure plates 231 are connected via one connecting plate 233. The air cylinder 232 drives the connecting plate 233 to move each pressure plate 231 synchronously, and each pressure plate 231 presses one corresponding battery cell body 310, with gaps left between adjacent pressure plates 231 to avoid interference with the slits of the slit device. The extension of the air cylinder 232 drives the downward movement of the pressure plate 231, which presses the corresponding battery cell body 310 against the battery cell support base 220. Each battery cell body 310 is provided with a pressure plate 231 that presses and positions it. When the slitting device slits, each battery cell body 310 is pressed against the pressure plate 231, so that the battery cell body 310 remains fixed. This allows the slitting device to slit accurately along the specified slit line, avoiding misalignment during slitting, reducing the defect rate, and improving reliability.

[0030] 11 to 13, in one embodiment, the lifting drive module includes two groups of die sets 241 and two lifting drive assemblies 242 arranged opposite to each other, each group of die sets 241 includes a plurality of the die sets 241, the hot cutting line 243 is connected between the two die sets 241 arranged opposite to each other, and the two lifting drive assemblies 242 respectively drive the two groups of die sets to lift and lower synchronously, thereby driving the lifting and lowering of the hot cutting line 243. Specifically, the two groups of die sets 241 are respectively a first group of die sets 241a and a second group of die sets 241b, and the two lift drive assemblies 242 are respectively a first group of die sets 241a and a second group of die sets 241b, with the first group of die sets 241a and the first lift drive assembly 242a located on one side of a rectangular support frame and the second group of die sets 241b and the second lift drive assembly 242b located on the other side of the rectangular support frame, such that the first group of die sets 241a and the second group of die sets 241b are arranged opposite each other. Both the first group of die sets 241a and the second group of die sets 241b include multiple die sets 241, and the number of die sets 241 in the first group of die sets 241a is equal to that in the second group of die sets 241b. The die sets 241 in the first group of die sets 241a and the die sets 241 in the second group of die sets 241b are arranged opposite each other, and two opposing die sets 241 form a pair of die sets 241, and a hot-cutting line 243 is connected between the pair of die sets 241. As shown in Fig. 12, the lifting drive assembly 242 includes a motor 2421, a screw rod 2422, a lifting platform 2423, and a connecting rod 2424, and the motor 2421 is connected to the screw rod 2422, which is connected to the lifting platform 2423, and the motor 2421 drives the screw rod 2422 to rotate, thereby lifting and lowering the lifting platform 2423. The lifting platform 2423 is fixed to the connecting rod 2424, and the die set 241 is attached to the connecting rod 2424, so that the die set 241 can be driven to move up and down, so that the hot cutting line 243 on the module can complete the slitting operation.The die sets 241 of the first die set group 241a are connected to the connecting rod 2424 of the first lifting drive assembly 242a, and the die sets 241 of the second die set group 241b are connected to the connecting rod 2424 of the second lifting drive assembly 242b. The connecting rod 2424 is further provided with a guide rail 2425, and the die set 241 is attached to the guide rail 2425. The die set 241 can be adjusted by sliding along the guide rail 2425. The distance between two adjacent hot cutting lines 243 is constant, and the distance between the two adjacent hot cutting lines 243 is equal to the distance between the predetermined slit lines. For example, if there are two predetermined slit lines and the distance between the two predetermined slit lines is 10 mm, the distance between the two adjacent hot cutting lines 243 is also 10 mm, and the two correspond to each other. As shown in FIG. 13 , in order to ensure the stability of the die set 241 when it is raised and lowered, both ends of the connecting rod 2424 are further slidably connected to guide posts 213 of the rectangular support frame. Specifically, the rectangular support frame is provided with guide posts 213 connecting the upper bracket plate 211 and the lower bracket plate 212, and guide bushes 2426 are provided on both ends of the connecting rod 2424, which are fitted into the guide posts 213 and slide along the guide posts 213, allowing the connecting rod 2424 to slide along the guide posts 213, thereby ensuring the stability of the die set 241 when it is raised and lowered and preventing the slits from misaligning.10 , in this embodiment, the predetermined slit lines are four vertical slit lines 501, and four pairs of die sets 241 are provided. During slitting, the air cylinder 232 first drives the four pressure plates 231 to press down, respectively pressing against the four connected battery cell bodies 310 of the stack unit 300. The motor 2421 drives the lifting platform 2423 to move upward via the screw rod 2422, and the lifting platform 2423 drives the die sets 241 to move upward via the connecting rod 2424. Specifically, the connecting rod 2424 drives the four die sets 241 to move upward from the underside of the stack unit 300, pass through the vertical slit lines 501, and proceed to the top of the stack unit 300. This allows the multiple die sets 241 to move up and down, simultaneously cutting the multiple layers of separators 400 of the connected battery cell bodies 310 and improving slitting efficiency.

[0031] (Addendum) (Appendix 1) a step of controlling a pressing plate to press the stacking unit against a battery cell support base, the stacking unit including m×n positive electrode sheets, m×n negative electrode sheets, and a separator, the m×n positive electrode sheets and the m×n negative electrode sheets being alternately stacked on the continuously laminated separator, and the m×n positive electrode sheets and the m×n negative electrode sheets being distributed in m rows and n columns to form m×n battery cell bodies in the stacking direction, where m is a positive integer of 1 or more and n is a positive integer of 2 or more; and controlling a slitting device to slit the multiple layers of separators of the stacked unit along preset slit lines to obtain m x n individual battery cell assemblies.

[0032] (Appendix 2) The method described in Appendix 1, characterized in that the predetermined slit lines include j vertical slit lines between the horizontally adjacent battery cell bodies, where j=n-1.

[0033] (Appendix 3) The method described in Appendix 2, characterized in that the predetermined slit lines include k horizontal slit lines between the vertically adjacent battery cell bodies, where k=m-1.

[0034] (Appendix 4) the slitting device is a cold cutting device, and the step of controlling the slitting device to slit the separator layers of the stacked unit along a preset slit line to obtain m×n individual battery cell assemblies includes: 4. The method according to claim 1, further comprising controlling a slitting blade of the cold cutting device to translate from one side edge of the stacked unit along the predetermined slit line to the other side edge of the stacked unit to cut the multiple layers of separators and slit the stacked unit into m×n individual battery cell bodies.

[0035] (Appendix 5) After the step of controlling a slitting device to slit the separators of the stacked unit along preset slit lines to obtain m×n individual battery cell assemblies, 5. The method of claim 4, further comprising packaging the separator on a side of the battery cell body.

[0036] (Appendix 6) the slitting device is a hot cutting device, and the step of controlling the slitting device to slit the multiple layers of separators of the stacked unit along preset slit lines to obtain m×n individual battery cell assemblies includes: 4. The method according to claim 1, further comprising controlling a hot cutting line of the hot cutting device to move upward from the lower side of the stacked unit along the predetermined slit line to the upper side of the stacked unit to cut the multiple layers of separators and slit the stacked unit into m×n individual battery cell assemblies.

[0037] (Appendix 7) A slitting device that can be used in the battery cell slitting method described in any one of Supplementary Notes 1 to 6, wherein the slitting device is a cold cutting device, and the cold cutting device comprises: The frame and a battery cell support base provided on the frame and used to place the stacked unit; a positioning mechanism provided on the frame, including a pressing plate, and used to drive the pressing plate to press the stacked unit against the battery cell support base; a cold cutting mechanism provided on the frame, the cold cutting mechanism including a slit blade and a translation drive module for driving the slit blade to move translationally.

[0038] (Appendix 8) The slit device described in Appendix 7, characterized in that the translation drive module includes a slide rail and a slide carrier, a plurality of the slit blades are attached to the slide carrier, and the slide carrier slides along the slide rail to translate the slit blades.

[0039] (Appendix 9) A slitting device that is applicable to the battery cell slitting method described in any one of Supplementary Notes 1 to 6, wherein the slitting device is a hot cutting device, and the hot cutting device comprises: The frame and a battery cell support base provided on the frame and used to place the stacked unit; a positioning mechanism provided on the frame, including a pressing plate, and used to drive the pressing plate to press the stacked unit against the battery cell support base; a hot cutting mechanism provided on the frame and including a hot cutting line and an elevation drive module for driving the hot cutting line to move up and down.

[0040] (Appendix 10) The slitting device described in Appendix 9, characterized in that the lifting drive module includes two groups of die sets and two lifting drive assemblies arranged opposite to each other, each group of die sets including a plurality of the die sets, the hot cutting line being connected between the two die sets arranged directly opposite to each other, and the two lifting drive assemblies respectively drive the two groups of die sets to lift and lower in synchronization to drive the lifting and lowering of the hot cutting line.

Claims

1. a step of controlling a pressing plate to press the stacking unit against a battery cell support base, the stacking unit including m×n positive electrode sheets, m×n negative electrode sheets, and a separator, the m×n positive electrode sheets and the m×n negative electrode sheets being alternately stacked on the continuously laminated separator, and the m×n positive electrode sheets and the m×n negative electrode sheets being distributed in m rows and n columns to form m×n battery cell bodies in the stacking direction, where m is a positive integer of 1 or more and n is a positive integer of 2 or more; and controlling a slitting device to slit the multiple layers of separators of the stacked unit along preset slit lines to obtain m x n individual battery cell assemblies.

2. 2. The method according to claim 1, wherein the predetermined slit lines include j vertical slit lines between the battery cell assemblies adjacent to each other on the left and right, where j=n-1.

3. 3. The method according to claim 2, wherein the predetermined slit lines include k horizontal slit lines between the vertically adjacent battery cell assemblies, where k=m-1.

4. the slitting device is a cold cutting device, and the step of controlling the slitting device to slit the separator layers of the stacked unit along a preset slit line to obtain m×n individual battery cell assemblies includes:

4. The method of claim 3, further comprising controlling a slitting blade of the cold cutting device to translate from one side edge of the stacked unit along the predetermined slit line to the other side edge of the stacked unit to cut through the multiple layers of separators and slit the stacked unit into m×n individual battery cell bodies.

5. After the step of controlling a slitting device to slit the separators of the stacked unit along preset slit lines to obtain m×n individual battery cell assemblies, 5. The method of claim 4, further comprising packaging the separator on a side of the battery cell assembly.

6. the slitting device is a hot cutting device, and the step of controlling the slitting device to slit the multiple layers of separators of the stacked unit along preset slit lines to obtain m×n individual battery cell assemblies includes:

4. The method of claim 3, further comprising controlling a hot cutting line of the hot cutting device to move upward from a lower side of the stacked unit along the predetermined slit line to an upper side of the stacked unit to cut the multiple layers of separators and slit the stacked unit into m×n individual battery cell assemblies.

7. A slitting device that is applicable to the battery cell slitting method according to any one of claims 1 to 6, wherein the slitting device is a cold cutting device, and the cold cutting device comprises: The frame and a battery cell support base provided on the frame and used to place the stacked unit; a positioning mechanism provided on the frame, including a pressing plate, and used to drive the pressing plate to press the stacked unit against the battery cell support base; a cold cutting mechanism provided on the frame, the cold cutting mechanism including a slit blade and a translation drive module for driving the slit blade to move translationally.

8. The slit device according to claim 7, characterized in that the translation drive module includes a slide rail and a slide carrier, a plurality of the slit blades are attached to the slide carrier, and the slide carrier slides along the slide rail to translate the slit blades.

9. 7. A slitting device that can be used in the battery cell slitting method according to claim 1, wherein the slitting device is a hot cutting device, and the hot cutting device comprises: The frame and a battery cell support base provided on the frame and used to place the stacked unit; a positioning mechanism provided on the frame, including a pressing plate, and used to drive the pressing plate to press the stacked unit against the battery cell support base; a hot cutting mechanism provided on the frame and including a hot cutting line and an elevation drive module for driving the hot cutting line to move up and down.

10. 10. The slitting device according to claim 9, wherein the lifting drive module includes two groups of die sets and two lifting drive assemblies arranged opposite to each other, each group of die sets including a plurality of the die sets, the hot cutting line being connected between the two die sets arranged opposite to each other, and the two lifting drive assemblies respectively drive the two groups of die sets to lift and lower synchronously to drive the lifting and lowering of the hot cutting line.

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