A molding process of soft-pack battery and battery

Abstract

The present invention relates to the field of battery technology, and in particular to a molding process for a soft-pack battery cell and a battery, comprising the following steps: A. a first separator and a second separator form a separator belt, B. a heat conductor is fixed to the first separator and the second separator, C. a positive electrode sheet is fixed to the first separator, and a negative electrode sheet is fixed to the second separator, D. a battery cell winding body is formed, E. a pole ear is welded, and F. packaging. The soft-pack battery cell made by the molding process of the present invention is designed with multiple pole ears, which significantly reduces the internal resistance of the battery, improves the current distribution, reduces the resistance loss when the current passes through a single ear, and the current can be distributed more evenly, reducing the problems of local overheating and current concentration, thereby improving the power density and discharge capacity of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a molding process of a soft-pack battery cell and a battery. Background Art

[0002] A battery is a device that converts chemical energy directly into electrical energy. It generates current through electrochemical reactions, providing energy for equipment to operate. A battery consists of a positive electrode, a negative electrode, an electrolyte, and a separator.

[0003] Traditional batteries only have one positive electrode ear and one negative electrode ear, and the positive electrode is connected to the external circuit through the positive electrode ear, and the negative electrode is connected to the external circuit through the negative electrode ear. There is a current concentration in a single electrode ear, which increases the internal resistance of the battery, reduces the power output, and affects the high-power discharge and fast charging performance of the battery. Therefore, it is necessary to improve it. Summary of the invention

[0004] The purpose of the present invention is to address the deficiencies in the prior art and provide a soft-pack battery cell molding process and a battery. The soft-pack battery cell made by the molding process is designed with multiple pole ears to significantly reduce the internal resistance of the battery, improve the current distribution, and reduce the resistance loss when the current passes through a single ear. The current can be distributed more evenly, reducing the problems of local overheating and current concentration, thereby improving the power density and discharge capacity of the battery.

[0005] To achieve the above object, a forming process of a soft-pack battery cell of the present invention comprises the following steps:

[0006] A. The first isolation film and the second isolation film form a membrane belt:

[0007] Lead out the first isolation film and the second isolation film, set the first isolation film and the second isolation film relatively horizontally, stick the first adhesive surface of the first double-sided tape to the top of the first isolation film and the second isolation film, and stick the first adhesive surface of the second double-sided tape to the bottom of the first isolation film and the second isolation film;

[0008] B. The heat conducting member is fixed to the first isolation membrane and the second isolation membrane:

[0009] The heat conducting member comprises a connecting portion and a heat conducting portion, and the heat conducting portion is provided with a slot;

[0010] The heat conductive member is arranged in a vertical shape and inserted into the joint of the first isolation film and the second isolation film through a slot, and the heat conductive member is rotated counterclockwise, and the heat conductive member is respectively bonded to the second adhesive surface of the first double-sided tape on the side of the second isolation film and to the second adhesive surface of the second double-sided tape on the side of the first isolation film;

[0011] C. The positive electrode is fixed to the first separator, and the negative electrode is fixed to the second separator:

[0012] Attach one end of the positive electrode sheet to the first double-sided tape with the second adhesive surface located on one side of the first separator, and attach one end of the negative electrode sheet to the second double-sided tape with the second adhesive surface located on one side of the second separator;

[0013] D. Cell winding forming:

[0014] Continue to rotate the heat-conducting member counterclockwise, so that the first separator, the positive electrode sheet, the second separator, and the negative electrode sheet are stacked and wound around the heat-conducting portion of the heat-conducting member to form a battery cell winding body;

[0015] E. Welding tabs:

[0016] There are multiple positive and negative pole ears, and the connecting part is provided with a positive and negative pole conductor;

[0017] A plurality of positive electrode ears are arranged at intervals on one side of the positive electrode ear close to the connection portion, and a plurality of negative electrode ears are arranged at intervals on one side of the negative electrode ear close to the connection portion. After the battery cell winding operation is completed, the plurality of positive electrode ears are attached to the surface of the positive electrode conductive member, and the plurality of negative electrode ears are attached to the surface of the negative electrode conductive member.

[0018] Welding a plurality of positive pole tabs to the positive pole conducting piece, and welding a plurality of negative pole tabs to the negative pole conducting piece, so that the battery cell winding body completes the pole tab welding operation;

[0019] F. Packaging:

[0020] The battery cell winding body with completed tab welding operation is placed into a soft shell and injected with a predetermined electrolyte, and the soft shell is hot-pressed and packaged so that the connecting portion of the heat conductor is exposed in the top sealing area of ​​the soft shell, and is connected to the soft-pack battery cell through the positive and negative conductive connectors.

[0021] Preferably, the first isolation film is transported by the first feed roller group, and the second isolation film is transported by the second feed roller group, a working area is provided between the first feed roller group and the second feed roller group, and a splicing device is provided in the working area;

[0022] The splicing device includes a fixing frame, a first negative pressure conveying plate, a second negative pressure conveying plate and a telescopic driver;

[0023] The fixing frame is arranged between the first feeding roller group and the second feeding roller group;

[0024] The telescopic driver drives the first negative pressure conveying plate and the second negative pressure conveying plate to slide along the fixing frame to approach or move away from each other.

[0025] Preferably, the method for splicing the diaphragm belt by the splicing device is:

[0026] A1. The telescopic driver drives the first negative pressure conveying plate and the second negative pressure conveying plate to slide along the fixed frame and move away from each other, and the first negative pressure conveying plate is located on one side of the first feed roller group, and the second negative pressure conveying plate is located on one side of the second feed roller group;

[0027] A2. The first feed roller group transports the first isolation film to the first negative pressure conveying plate, and the second feed roller group transports the second isolation film to the second negative pressure conveying plate;

[0028] A3. The telescopic driver drives the first negative pressure conveying plate and the second negative pressure conveying plate to slide along the fixing frame and approach each other and splice together, so that the first isolation membrane and the second isolation membrane are spliced;

[0029] A4. After the first isolation film and the second isolation film are bonded, the telescopic driver drives the first negative pressure conveying plate and the second negative pressure conveying plate to slide along the fixed frame and move away from each other, the first negative pressure conveying plate retreats to one side of the first feed roller group, and the second negative pressure conveying plate retreats to one side of the second feed roller group.

[0030] Preferably, a glue sticking telescopic platform is provided above and below the working area, the two glue sticking telescopic platforms are arranged opposite to each other, and the first double-sided tape and the second double-sided tape are both roll-shaped double-sided tapes with multiple fixed lengths;

[0031] The glue sticking telescopic table comprises a telescopic frame, a lifting drive, a first material roller, a second material roller, a supporting roller, a pressing block and a pressing wheel;

[0032] The lifting drive drives the telescopic frame to extend and retract;

[0033] The first material roller and the second material roller are both rotatably arranged in the telescopic frame, the first material roller is used for conveying the rolled double-sided adhesive tape, and the second material roller is used for winding the release paper of the rolled double-sided adhesive tape;

[0034] There are multiple support rollers, which are rotatably arranged on both sides of the telescopic frame and are used to guide the release paper of the rolled double-sided tape;

[0035] The pressing block is arranged in the middle of the telescopic frame, extending from the telescopic frame and frictionally connected to the release paper of the roll double-sided tape, and a telescopic piece is arranged at one end of the pressing block connected to the telescopic frame, and is connected to the telescopic frame through the telescopic piece;

[0036] There are two pressing wheels, which are respectively arranged on both sides of the pressing block. The pressing wheels are hinged to the telescopic frame, and a reset piece is arranged at the hinge between the pressing wheels and the telescopic frame.

[0037] Preferably, the method for bonding the first isolation film and the second isolation film by the adhesive extension table is as follows:

[0038] A5. The roll of double-sided tape is placed on the first material roller, and the release paper of the roll of double-sided tape is wound on the second material roller via the support roller and the pressing block. The first material roller and the second material roller work simultaneously, and the double-sided tape of the roll of double-sided tape with fixed length is transported to the end of the telescopic frame along with the winding of the release paper, and the pressing block pushes the middle part of the fixed length of the double-sided tape out of the telescopic frame through the release paper;

[0039] A6. The lifting drivers of the two adhesive-laminating telescopic tables simultaneously drive the telescopic frames to extend, and the two pressing blocks simultaneously stick the middle part of the fixed-length double-sided tape to the joint of the first isolation film and the second isolation film through the release paper; the two telescopic frames continue to approach each other, and the pressing wheels of the two adhesive-laminating telescopic tables contact each other, and roll along the two ends of the fixed-length double-sided tape against the release paper and move away from each other, so that the fixed-length double-sided tape is completely stuck to the two ends of the joint of the first isolation film and the second isolation film;

[0040] A7. After the first isolation film and the second isolation film are bonded to form the isolation film belt, the lifting drives of the two glue-applying telescopic tables simultaneously drive the telescopic frames to retract, and the two telescopic frames continue to move away from each other, the reset member is restored, and the pressing wheel is reset along with the reset member, and the two pressing blocks are also separated from each other, and the two glue-applying telescopic tables withdraw from the working area.

[0041] Preferably, a winding device is provided on one side of the working area, and the winding device includes a clamping fixture for fixing the heat-conducting member and a winding driver for driving the clamping fixture to rotate and retract;

[0042] Working method of winding device:

[0043] B1. Fix the heat conducting member vertically on the clamping fixture;

[0044] B2. The winding drive drives the clamping fixture to extend into the working area so that the slot of the heat conductive member is inserted into the joint of the first isolation membrane and the second isolation membrane;

[0045] B3. The winding drive drives the clamping fixture to rotate counterclockwise 90°, and the heat conductor changes from a vertical shape to a horizontal shape, so that the heat conductor is respectively bonded to the second adhesive surface of the first double-sided tape on one side of the second isolation membrane and to the second adhesive surface of the second double-sided tape on one side of the first isolation membrane, thereby fixing the heat conductor to the first isolation membrane and the second isolation membrane respectively.

[0046] Preferably, a pole piece attaching manipulator is arranged outside the working area, and the pole piece attaching manipulator comprises a negative pressure suction cup and a clamping finger;

[0047] The method of fixing the positive electrode sheet to the first isolation film and the negative electrode sheet to the second isolation film:

[0048] C1. The negative pressure suction cup of the manipulator conveys one end of the positive electrode sheet to the second adhesive surface of the first double-sided tape on one side of the first isolation film, and the clamping fingers clamp the positive electrode sheet and the heat-conducting portion of the heat-conducting member to fix the positive electrode sheet to the first isolation film;

[0049] C2. Use the negative pressure suction cup of the manipulator to stick one end of the negative electrode sheet to the second adhesive surface of the second double-sided tape on one side of the second isolation film, and clamp the negative electrode sheet and the heat conductive part of the heat conductive member with the clamping fingers to fix the negative electrode sheet to the second isolation film.

[0050] Preferably, the positive electrode sheet and the negative electrode sheet each include a first current collector, a heat conductive layer, a second current collector, a first material layer and a second material layer;

[0051] The first current collector and the second current collector are respectively fixed on both sides of the heat-conducting layer, the first material layer is fixed on the first current collector, and the second material layer is fixed on the first current collector.

[0052] Preferably, a blank area is provided at one end of the positive electrode sheet fixed to the first isolation film and at one end of the negative electrode sheet fixed to the second isolation film, and the heat conductive layers of the positive electrode sheet and the negative electrode sheet extend into the blank area.

[0053] The present invention further provides a battery, comprising a shell and a battery cell arranged in the shell, wherein the battery cell comprises a soft-pack battery cell made by the above-mentioned soft-pack battery cell molding process.

[0054] Beneficial effects of the present invention: The soft-pack battery cell made by the molding process of the present invention is designed with multiple pole ears, which significantly reduces the internal resistance of the battery, improves the current distribution, reduces the resistance loss when the current passes through a single ear, and the current can be distributed more evenly, reducing the problems of local overheating and current concentration, thereby improving the power density and discharge capacity of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a schematic diagram of the structure of the soft-pack battery cell of the present invention in an unfolded state.

[0056] Figure 2 It is a schematic diagram of the partial structure of the soft-pack battery cell of the present invention in an unfolded state.

[0057] Figure 3 It is a schematic diagram of the structure of the soft-pack battery cell of the present invention in the forming state.

[0058] Figure 4 It is a schematic diagram of the layered structure of the negative electrode sheet of the present invention.

[0059] Figure 5 It is a schematic diagram of the structure of the splicing device of the present invention.

[0060] Figure 6 It is a schematic diagram of the structure of the glue-laminating telescopic table of the present invention.

[0061] Figure 7 It is a schematic diagram of the structure of the winding device and the electrode attaching robot of the present invention.

[0062] Reference numerals include:

[0063] 1. Soft-pack battery cell; 11. First isolation film; 12. Second isolation film; 13. Heat-conducting member; 131. Connecting part; 132. Heat-conducting part; 133. Slot; 134. Positive electrode conductor; 135. Negative electrode conductor; 14. Positive electrode sheet; 15. Negative electrode sheet; 16. Positive electrode ear; 17. Negative electrode ear; 18. Soft shell; 191. First current collector; 192. Heat-conducting layer; 193. Second current collector; 194. First material layer; 195. Second material layer; 2. First double-sided tape; 3. Second double-sided tape; 4. First feed roller group; 5. , the second feed roller group; 6, splicing device; 61, fixed frame; 62, the first negative pressure conveying plate; 63, the second negative pressure conveying plate; 64, telescopic drive; 7, glue sticking telescopic platform; 71, telescopic frame; 72, lifting drive; 73, the first material roller; 74, the second material roller; 75, support roller; 76, pressure block; 761, telescopic part; 77, pressure wheel; 771, reset part; 8, winding device; 81, clamping fixture; 82, winding drive; 9, electrode sticking robot; 91, negative pressure suction cup; 92, clamping finger; 93, clearance hole. DETAILED DESCRIPTION

[0064] The present invention is described in detail below with reference to the accompanying drawings.

[0065] like Figures 1 to 7 As shown, a molding process of a soft-pack battery cell of the present invention, the soft-pack battery cell 1 made by the molding process includes a first isolation film 11, a second isolation film 12, a heat conductive member 13, a positive electrode sheet 14, a negative electrode sheet 15, a positive electrode ear 16, a negative electrode ear 17 and a soft shell 18.

[0066] The molding process of the present invention comprises the following steps:

[0067] A. The first isolation film 11 and the second isolation film 12 form a diaphragm belt:

[0068] Lead out the first isolation film 11 and the second isolation film 12, set the first isolation film 11 and the second isolation film 12 relatively horizontally, stick the first adhesive surface of the first double-sided tape 2 to the top of the first isolation film 11 and the second isolation film 12, and stick the first adhesive surface of the second double-sided tape 3 to the bottom of the first isolation film 11 and the second isolation film 12, so that the first isolation film 11 and the second isolation film 12 form a membrane tape.

[0069] B. The heat conducting member 13 is fixed to the first isolation film 11 and the second isolation film 12:

[0070] The heat conducting member 13 includes a connecting portion 131 and a heat conducting portion 132 , and the heat conducting portion 132 is provided with a slot 133 . Specifically, the slot 133 is in a long strip shape and is provided along the length direction of the heat conducting portion 132 .

[0071] The heat conductive member 13 is arranged in a vertical shape and inserted into the joint of the first isolation membrane 11 and the second isolation membrane 12 through the slot 133. The heat conductive member 13 is rotated counterclockwise, and the heat conductive member 13 is respectively bonded to the second adhesive surface of the first double-sided tape 2 located on the side of the second isolation membrane 12 and to the second adhesive surface of the second double-sided tape 3 located on the side of the first isolation membrane 11, so that the heat conductive member 13 is respectively fixed to the first isolation membrane 11 and the second isolation membrane 12.

[0072] Preferably, thermal conductive adhesive tape is provided on the inner side of the slot 133. In other embodiments, the inner side of the slot 133 may be rounded, and the thermal conductive adhesive tape or the inner side of the slot 133 with rounded corners can reduce the damage to the first isolation membrane 11 and the second isolation membrane 12 when the slot 133 is inserted into the joint of the first isolation membrane 11 and the second isolation membrane 12.

[0073] C. The positive electrode sheet 14 is fixed to the first isolation film 11, and the negative electrode sheet 15 is fixed to the second isolation film 12:

[0074] One end of the positive electrode sheet 14 is attached to the second adhesive surface of the first double-sided tape 2 on one side of the first isolation film 11, and one end of the negative electrode sheet 15 is attached to the second adhesive surface of the second double-sided tape 3 on one side of the second isolation film 12, so that the positive electrode sheet 14 is fixed to the first isolation film 11 and the negative electrode sheet 15 is fixed to the second isolation film 12.

[0075] D. Cell winding forming:

[0076] The heat conductive member 13 is rotated counterclockwise continuously to allow the first isolation film 11 , the positive electrode sheet 14 , the second isolation film 12 and the negative electrode sheet 15 to be stacked and wound around the heat conductive portion 132 of the heat conductive member 13 to form a battery cell winding body, so that the battery cell winding body is formed.

[0077] E. Welding tabs:

[0078] A plurality of positive electrode tabs 16 and a plurality of negative electrode tabs 17 are provided, and a positive electrode conductor 134 and a negative electrode conductor 135 are provided at the connection portion 131 .

[0079] A plurality of positive electrode ears 16 are spaced apart on one side of the positive electrode ear 16 close to the connecting portion 131 , and a plurality of negative electrode ears 17 are spaced apart on one side of the negative electrode ear 17 close to the connecting portion 131 . After the cell winding operation is completed, the plurality of positive electrode ears 16 are attached to the surface of the positive electrode conductor 134 , and the plurality of negative electrode ears 17 are attached to the surface of the negative electrode conductor 135 .

[0080] The plurality of positive tabs 16 are welded to the positive electrode conductor 134 , and the plurality of negative tabs 17 are welded to the negative electrode conductor 135 , so that the tab welding operation of the battery cell winding body is completed.

[0081] The design of multiple tabs significantly reduces the internal resistance of the battery, improves the current distribution, reduces the resistance loss when the current passes through a single tab, and improves the overall performance of the battery.

[0082] On the other hand, the design of multiple pole ears improves power density. Through multiple positive pole ears 16 and negative pole ears 17, the current can be distributed more evenly, reducing the problems of local overheating and current concentration, thereby improving the power density and discharge capacity of the battery.

[0083] Specifically, the spacing between the plurality of positive tabs 16 and the spacing between the plurality of negative tabs 17 are gradually increased, so that the plurality of positive tabs 16 are sequentially arranged and attached to the surface of the positive electrode conductor 134, and the plurality of negative tabs 17 are sequentially arranged and attached to the surface of the negative electrode conductor 135, thereby reducing the thickness of the connection between the plurality of positive tabs 16 and the positive electrode conductor 134 and the thickness of the plurality of negative tabs 17 and the negative electrode conductor 135. On the other hand, the design of sequentially arranging the plurality of tabs helps to evenly dissipate heat, reduce the formation of hot spots, improve the thermal management performance of the battery, extend the battery life and improve safety.

[0084] It can also enhance the mechanical stability of the battery. Multiple electrode ears disperse the stress, making the battery more stable under mechanical stress and reducing the risk of damage during use.

[0085] Improve the consistency and reliability of batteries. The multi-ear design helps to improve the consistency and reliability of batteries during production and use, reduce failure rates, and improve overall product quality.

[0086] F. Packaging:

[0087] The battery cell winding body with completed tab welding operation is loaded into the soft shell 18 and injected with the predetermined electrolyte, and the soft shell 18 is hot-pressed and packaged so that the connecting portion 131 of the heat conductor 13 is exposed in the top sealing area of ​​the soft shell 18, and is connected to the soft-pack battery cell 1 through the positive electrode conductor 134 and the negative electrode conductor 135.

[0088] The present invention forms a soft-pack battery cell through multiple process steps, including forming a diaphragm belt by a first isolation film 11 and a second isolation film 12, fixing a heat conductor 13 to the first isolation film 11 and the second isolation film 12, fixing a positive electrode sheet 14 to the first isolation film 11, fixing a negative electrode sheet 15 to the second isolation film 12, forming a battery cell winding body, welding pole ears and packaging. The formed soft-pack battery cell significantly reduces the internal resistance of the battery through the design of multiple pole ears, improves the current distribution, reduces the resistance loss when the current passes through a single ear, and the current can be distributed more evenly, reducing the problems of local overheating and current concentration, thereby improving the power density and discharge capacity of the battery.

[0089] like Figure 5 As shown, in this embodiment, the first isolation film 11 is transported by the first feed roller group 4, and the second isolation film 12 is transported by the second feed roller group 5. A working area is provided between the first feed roller group 4 and the second feed roller group 5, and a splicing device 6 is provided in the working area;

[0090] The splicing device 6 comprises a fixing frame 61, a first negative pressure conveying plate 62, a second negative pressure conveying plate 63 and a telescopic driver 64. The telescopic driver 64 is a different direction pneumatic slide module.

[0091] The fixing frame 61 is disposed between the first feeding roller set 4 and the second feeding roller set 5 .

[0092] The telescopic driver 64 drives the first negative pressure conveying plate 62 and the second negative pressure conveying plate 63 to slide along the fixing frame 61 to move closer to or farther from each other.

[0093] During use, the number of the first negative pressure conveying plate 62, the second negative pressure conveying plate 63 and the telescopic driver 64 are all two. A first negative pressure conveying plate 62, a second negative pressure conveying plate 63 and a telescopic driver 64 form a group of conveying modules, and the two groups of conveying modules are respectively arranged on both sides of the fixed frame 61.

[0094] When in use, the two groups of conveying modules are respectively sucked on the two side edges of the first isolation film 11 or the second isolation film 12 for conveying, so that the first isolation film 11 or the second isolation film 12 is protected and unfolded in a flat state when spliced.

[0095] An avoidance groove is provided between the two groups of conveying modules, and the avoidance groove facilitates bonding of the first isolation membranes 11 and the first isolation membranes 11 .

[0096] like Figure 5 As shown, the method of splicing the diaphragm belt by the splicing device 6 of this embodiment is as follows:

[0097] A1. The telescopic driver 64 drives the first negative pressure conveying plate 62 and the second negative pressure conveying plate 63 to slide along the fixed frame 61 and move away from each other, and the first negative pressure conveying plate 62 is located on one side of the first feed roller group 4, and the second negative pressure conveying plate 63 is located on one side of the second feed roller group 5.

[0098] A2. The first feed roller group 4 feeds the first isolation film 11 to the first negative pressure conveying plate 62 , and the second feed roller group 5 feeds the second isolation film 12 to the second negative pressure conveying plate 63 .

[0099] A3. The telescopic driver 64 drives the first negative pressure conveying plate 62 and the second negative pressure conveying plate 63 to slide along the fixing frame 61 so as to approach each other and be spliced ​​together, so that the first isolation membrane 11 and the second isolation membrane 12 are spliced.

[0100] A4. After the first isolation film 11 and the second isolation film 12 are bonded, the telescopic driver 64 drives the first negative pressure conveying plate 62 and the second negative pressure conveying plate 63 to slide along the fixing frame 61 and move away from each other, and the first negative pressure conveying plate 62 retreats to one side of the first feeding roller group 4, and the second negative pressure conveying plate 63 retreats to one side of the second feeding roller group 5. The first negative pressure conveying plate 62 and the second negative pressure conveying plate 63 retreat to the edge of the working area to avoid interfering with the fixing of the heat conductive member 13 and the first isolation film 11 and the second isolation film 12.

[0101] like Figure 5 and Figure 6 As shown, in this embodiment, a gluing telescopic table 7 is provided above and below the working area, and the two gluing telescopic tables 7 are arranged opposite to each other. The first double-sided tape 2 and the second double-sided tape 3 are both multiple-section fixed-length roll-shaped double-sided tapes.

[0102] Specifically, the multiple sections of fixed-length roll-shaped double-sided tape are one of polyester (PET) base double-sided tape, polyimide (PI) base double-sided tape or acrylic adhesive double-sided tape, so that the first double-sided tape 2 and the second double-sided tape 3 have excellent high temperature resistance, chemical corrosion resistance and electrical insulation properties.

[0103] The glue laminating telescopic platform 7 comprises a telescopic frame 71 , a lifting drive 72 , a first material roller 73 , a second material roller 74 , a supporting roller 75 , a pressing block 76 and a pressing wheel 77 .

[0104] The lifting drive 72 drives the telescopic frame to extend and retract. Specifically, the lifting drive 72 is a conventional cylinder or a conventional lifting cylinder module.

[0105] The first material roller 73 and the second material roller 74 are both rotatably arranged in the telescopic frame. The first material roller 73 is used to convey the rolled double-sided adhesive tape, and the second material roller 74 is used to wind up the release paper of the rolled double-sided adhesive tape. Specifically, the first material roller 73 and the second material roller 74 are both conventional electric material rollers.

[0106] There are multiple support rollers 75, which are rotatably arranged on both sides of the telescopic frame and are used to guide the release paper of the roll double-sided tape. The support rollers 75 are conventional guide wheels.

[0107] The pressing block 76 is arranged in the middle of the telescopic frame, extending from the telescopic frame and frictionally connected with the release paper of the roll double-sided tape, and a telescopic member 761 is arranged at one end of the pressing block 76 connected to the telescopic frame, and the pressing block 76 is connected to the telescopic frame through the telescopic member 761. Specifically, the pressing block 76 is trapezoidal, and the telescopic member 761 is a spring or a telescopic gas rod, and a spring is used as an example in this embodiment.

[0108] There are two pressing wheels 77 , which are respectively arranged on both sides of the pressing block 76 . The pressing wheels 77 are hinged to the telescopic frame, and a reset member 771 is arranged at the hinge between the pressing wheels 77 and the telescopic frame.

[0109] Specifically, the pressing wheel 77 includes a swing arm, and the pressing wheel 77 is hinged to the telescopic frame through the swing arm. The reset member 771 is a torsion spring or a reset spring, and the present embodiment takes a torsion spring as an example.

[0110] The method of gluing the first isolation film 11 and the second isolation film 12 on the adhesive extension platform 7 of this embodiment is as follows:

[0111] A4. The roll of double-sided adhesive tape is set on the first material roller 73, and the release paper of the roll of double-sided adhesive tape is wound on the second material roller 74 via the support roller 75 and the pressing block 76. The first material roller 73 and the second material roller 74 work simultaneously. Specifically, the first material roller 73 and the second material roller 74 rotate quantitatively at the same time, and the release paper of the roll of double-sided adhesive tape with a preset length is output from the first material roller 73 and rolled up on the second material roller 74. The double-sided adhesive tape of the roll of double-sided adhesive tape with a fixed length is transported to the end of the telescopic frame along with the winding of the release paper, and the pressing block 76 pushes the middle part of the fixed length of the double-sided adhesive tape out of the telescopic frame through the release paper, so that the first double-sided adhesive tape 2 or the second double-sided adhesive tape 3 is set at the end of the telescopic frame, which is convenient for bonding the first isolation film 11 and the second isolation film 12.

[0112] A5. The lifting drivers 72 of the two adhesive-sticking telescopic tables 7 simultaneously drive the telescopic frames to extend, and the two pressing blocks 76 simultaneously stick the middle part of the fixed-length double-sided tape to the joint of the first isolation film 11 and the second isolation film 12 through the release paper.

[0113] The two telescopic frames continue to approach each other, and the pressing wheels 77 of the two glue-applying telescopic tables 7 collide with each other, and the release paper rolls along the two ends of the fixed-length double-sided tape and moves away from each other, so that the fixed-length double-sided tape is completely adhered to the two ends of the joint of the first isolation membrane 11 and the second isolation membrane 12.

[0114] Specifically, as the two telescopic frames approach each other, the telescopic parts 761 of the two glue-laminating telescopic platforms 7 are both contracted, and the pressing block 76 also moves closer with the contraction of the telescopic parts 761, and the pressing wheels 77 on both sides of the pressing block 76 move away from each other and abut against the release paper.

[0115] As the two telescopic frames continue to approach each other, the pressing wheels 77 of the two glue-applying telescopic stages 7 respectively contact each other via the release paper, the fixed-length double-sided tape, and the first isolation film 11 or the second isolation film 12 .

[0116] When the pressing wheels 77 of the two glue-applying telescopic platforms 7 collide with each other, the pressing wheels 77 rotate to deform the reset member 771. During the rotation, the two pressing wheels 77 of one glue-applying telescopic platform 7 press against the release paper and roll away from each other along the two ends of the fixed-length double-sided tape, so that the fixed-length double-sided tape is completely adhered to the two ends of the joint of the first isolation membrane 11 and the second isolation membrane 12, so that the first adhesive surface of the first double-sided tape 2 is adhered to the top of the first isolation membrane 11 and the second isolation membrane 12, and the first adhesive surface of the second double-sided tape 3 is adhered to the bottom of the first isolation membrane 11 and the second isolation membrane 12, so that the first isolation membrane 11 and the second isolation membrane 12 are bonded to form a membrane tape.

[0117] A6. After the first isolation film 11 and the second isolation film 12 are bonded to form a membrane belt, the lifting drivers 72 of the two glue-applying telescopic tables 7 simultaneously drive the telescopic frames to retract, and the two telescopic frames continue to move away from each other, the reset member 771 is restored, and the pressing wheel 77 is reset as the reset member 771 is restored, and the two pressing blocks 76 are also separated from each other, and the two glue-applying telescopic tables 7 withdraw from the working area.

[0118] like Figure 7 As shown, a winding device 8 is provided at one side of the working area of ​​the present embodiment, and the winding device 8 includes a clamping fixture 81 for fixing the heat-conducting member 13 and a winding driver 82 for driving the clamping fixture 81 to rotate and retract. In actual use, the winding device 8 is arranged at the rear of the working area, so that the winding driver 82 can drive the heat-conducting member 13 fixed to the clamping fixture 81 to approach the first isolation film 11 and the second isolation film 12 in the working area, so that the heat-conducting member 13 is inserted into the joint of the first isolation film 11 and the second isolation film 12 through the slot 133.

[0119] Specifically, the clamping fixture 81 is a conventional clamping table or a conventional clamping cylinder, and the winding driver 82 is a conventional rotary clamping cylinder.

[0120] Working method of winding device 8:

[0121] B1. Fix the heat conducting member 13 vertically on the clamping fixture 81 .

[0122] B2. The winding driver 82 drives the clamping fixture 81 to extend into the working area so that the slot 133 of the heat conducting member 13 is inserted into the joint of the first isolation film 11 and the second isolation film 12 .

[0123] B3. The winding drive 82 drives the clamping fixture 81 to rotate counterclockwise by 90°, and the heat conductor 13 is transformed from a vertical shape to a horizontal shape, so that the heat conductor 13 is respectively bonded to the second adhesive surface of the first double-sided tape 2 on one side of the second isolation film 12 and to the second adhesive surface of the second double-sided tape 3 on one side of the first isolation film 11, thereby fixing the heat conductor 13 to the first isolation film 11 and the second isolation film 12 respectively.

[0124] like Figure 7 As shown, a pole piece attaching robot 9 is arranged outside the working area of ​​the present embodiment, and the pole piece attaching robot 9 includes a negative pressure suction cup 91 and a clamping finger 92 .

[0125] In actual use, a clearance hole 93 is provided on one side of the negative pressure suction cup 91, and the clamping fingers 92 clamp the positive electrode sheet 14 and the heat conductive member 13 or clamp the negative electrode sheet 15 and the heat conductive member 13 through the clearance hole 93, so as to facilitate the fixing of the positive electrode sheet 14 to the first isolation membrane 11 or the fixing of the negative electrode sheet 15 to the second isolation membrane 12.

[0126] The method of fixing the positive electrode sheet 14 to the first isolation film 11 and the negative electrode sheet 15 to the second isolation film 12 is as follows:

[0127] C1. The negative pressure suction cup 91 of the manipulator conveys one end of the positive electrode sheet 14 to the second adhesive surface of the first double-sided tape 2 on one side of the first isolation film 11 , and the clamping fingers 92 clamp the positive electrode sheet 14 and the heat-conducting portion 132 of the heat-conducting member 13 so that the positive electrode sheet 14 is fixed to the first isolation film 11 .

[0128] C2. Use the negative pressure suction cup 91 of the manipulator to stick one end of the negative electrode sheet 15 to the second adhesive surface of the second double-sided tape 3 on one side of the second isolation film 12, and the clamping fingers 92 clamp the negative electrode sheet 15 and the heat-conducting portion 132 of the heat-conducting member 13 to fix the negative electrode sheet 15 to the second isolation film 12.

[0129] like Figure 4 As shown, the positive electrode sheet 14 and the negative electrode sheet 15 of this embodiment both include a first current collector 191 , a heat conductive layer 192 , a second current collector 193 , a first material layer 194 and a second material layer 195 .

[0130] The first current collector 191 and the second current collector 193 are fixed to the two sides of the heat conductive layer 192, the first material layer 194 is fixed to the first current collector 191, and the second material layer 195 is fixed to the first current collector 191. The positive electrode sheet 14 and the negative electrode sheet 15 are both composite current collector electrodes, which increases the electrical and thermal conductivity of the battery, and at the same time improves the overall stability and life of the battery.

[0131] The thermal conductive layer 192 is a carbon fiber layer or a conductive electric heating silicone layer with high thermal conductivity, which improves the connection conductivity, thermal conductivity, elasticity, flexibility and firmness of the positive electrode sheet 14 and the negative electrode sheet 15 .

[0132] The conductivity is improved, and good conductivity is provided for the positive electrode sheet 14 and the negative electrode sheet 15 , which is helpful for the current transmission of the first current collector 191 and the second current collector 193 .

[0133] The thermal conductivity is improved so that the positive electrode sheet 14 and the negative electrode sheet 15 can dissipate heat effectively and reduce heat accumulation during battery operation.

[0134] The elasticity and flexibility are improved so that the positive electrode sheet 14 and the negative electrode sheet 15 can adapt to the deformation and thermal expansion inside the battery.

[0135] The adhesion is improved so that the heat conductive layer 192 and the first current collector 191 and the second current collector 193 have good adhesion, thereby ensuring a firm connection.

[0136] In this embodiment, blank areas are provided at one end of the positive electrode sheet 14 fixed to the first isolation film 11 and one end of the negative electrode sheet 15 fixed to the second isolation film 12, and the heat conductive layers 192 of the positive electrode sheet 14 and the negative electrode sheet 15 extend into the blank areas.

[0137] One end of the heat conductive layer 192 of the positive electrode sheet 14 and the negative electrode sheet 15 is attached to the surface of the heat conductive member 13 through the first isolation film 11 or the second isolation film 12, so that the heat generated by the positive electrode sheet 14 and the negative electrode sheet 15 during operation can be easily transferred to the heat conductive member 13 through the heat conductive layer 192.

[0138] The heat conducting member 13 of this embodiment is made of a heat conducting and insulating material. Specifically, the heat conducting member 13 can be made of one or more materials selected from the group consisting of aluminum oxide (Al2O3), aluminum nitride (AlN), boron nitride (hexagonal boron nitride, h-BN), diamond, silicone rubber, or aluminum oxide ceramics, so that the heat conducting member 13 has good thermal conductivity and insulation.

[0139] A connecting sleeve is provided outside the connecting portion 131, and a connecting groove is provided between the connecting sleeve and the connecting portion 131, and the positive electrode conductor 134 and the negative electrode conductor 135 are exposed in the connecting groove. The matching of the connecting sleeve and the connecting groove facilitates the connection with the positive electrode conductor 134 and the negative electrode conductor 135.

[0140] The present invention also provides a battery, comprising a shell and a battery cell arranged in the shell, wherein the battery cell comprises a soft-pack battery cell 1 made by the above-mentioned soft-pack battery cell molding process. The battery cell is designed with multiple tabs, which significantly reduce the internal resistance of the battery, improve the distribution of current, reduce the resistance loss when the current passes through a single tab, and the current can be distributed more evenly, reducing the problems of local overheating and current concentration, thereby improving the power density and discharge capacity of the battery.

[0141] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A forming process for a soft-pack battery cell, characterized in that: The following steps are included: A. The first isolation film (11) and the second isolation film (12) form a membrane belt: Leading out the first isolation film (11) and the second isolation film (12), placing the first isolation film (11) and the second isolation film (12) relatively horizontally, attaching the first adhesive surface of the first double-sided adhesive tape (2) to the top of the first isolation film (11) and the second isolation film (12), and attaching the first adhesive surface of the second double-sided adhesive tape (3) to the bottom of the first isolation film (11) and the second isolation film (12); B. The heat conducting member (13) is fixed to the first isolation membrane (11) and the second isolation membrane (12): The heat conducting member (13) comprises a connecting portion (131) and a heat conducting portion (132), and the heat conducting portion (132) is provided with a slot (133); The heat conductive member (13) is arranged in a vertical shape and inserted into the joint of the first isolation film (11) and the second isolation film (12) through the slot (133), and the heat conductive member (13) is rotated counterclockwise, so that the heat conductive member (13) is respectively bonded to the second adhesive surface of the first double-sided adhesive tape (2) located on the side of the second isolation film (12) and to the second adhesive surface of the second double-sided adhesive tape (3) located on the side of the first isolation film (11); C. The positive electrode sheet (14) is fixed to the first isolation film (11), and the negative electrode sheet (15) is fixed to the second isolation film (12): One end of the positive electrode sheet (14) is attached to the second adhesive surface of the first double-sided tape (2) located on one side of the first isolation film (11), and one end of the negative electrode sheet (15) is attached to the second adhesive surface of the second double-sided tape (3) located on one side of the second isolation film (12); D. Cell winding forming: The heat conducting member (13) is continuously rotated counterclockwise, so that the first isolation film (11), the positive electrode sheet (14), the second isolation film (12), and the negative electrode sheet (15) are stacked and wound around the heat conducting portion (132) of the heat conducting member (13) at intervals to form a battery cell winding body; E. Welding tabs: A plurality of positive electrode ears (16) and a plurality of negative electrode ears (17) are provided, and the connecting portion (131) is provided with a positive electrode conductive member (134) and a negative electrode conductive member (135); A plurality of positive electrode ears (16) are arranged at intervals on a side of the positive electrode ear (16) close to the connecting portion (131), and a plurality of negative electrode ears (17) are arranged at intervals on a side of the negative electrode ear (17) close to the connecting portion (131); after the battery cell winding operation is completed, the plurality of positive electrode ears (16) are attached to the surface of the positive electrode conductive member (134), and the plurality of negative electrode ears (17) are attached to the surface of the negative electrode conductive member (135); Welding a plurality of positive electrode tabs (16) to a positive electrode conductive member (134), and welding a plurality of negative electrode tabs (17) to a negative electrode conductive member (135), so that the battery cell winding body completes the tab welding operation; F. Packaging: The battery cell winding body that has completed the tab welding operation is placed in a soft shell (18) and a predetermined electrolyte is injected, and the soft shell (18) is hot-pressed and packaged so that the connection portion (131) of the heat conductive member (13) is exposed in the top sealing area of ​​the soft shell (18), and is connected to the soft-package battery cell (1) through the positive electrode conductive member (134) and the negative electrode conductive member (135); A first isolation film (11) is transported through a first feed roller group (4), and a second isolation film (12) is transported through a second feed roller group (5), a working area is provided between the first feed roller group (4) and the second feed roller group (5), and a splicing device (6) is provided in the working area; The splicing device (6) comprises a fixing frame (61), a first negative pressure conveying plate (62), a second negative pressure conveying plate (63) and a telescopic driver (64); The fixing frame (61) is arranged between the first feed roller group (4) and the second feed roller group (5); The telescopic driver (64) drives the first negative pressure conveying plate (62) and the second negative pressure conveying plate (63) to slide along the fixing frame (61) so as to move closer to or farther from each other.

2. A forming process for a soft-pack battery cell according to claim 1, characterized in that: The method of splicing the diaphragm belt by the splicing device (6): A1. The telescopic driver (64) drives the first negative pressure conveying plate (62) and the second negative pressure conveying plate (63) to slide along the fixed frame (61) and move away from each other, and the first negative pressure conveying plate (62) is located on one side of the first feed roller group (4), and the second negative pressure conveying plate (63) is located on one side of the second feed roller group (5); A2. The first feed roller group (4) feeds the first isolation film (11) to the first negative pressure conveying plate (62), and the second feed roller group (5) feeds the second isolation film (12) to the second negative pressure conveying plate (63); A3. The telescopic driver (64) drives the first negative pressure conveying plate (62) and the second negative pressure conveying plate (63) to slide along the fixing frame (61) and approach each other and splice together, so that the first isolation membrane (11) and the second isolation membrane (12) are spliced, which facilitates the bonding of the first isolation membrane (11) and the second isolation membrane (12); A4. After the first isolation film (11) and the second isolation film (12) are bonded, the telescopic driver (64) drives the first negative pressure conveying plate (62) and the second negative pressure conveying plate (63) to slide along the fixed frame (61) and move away from each other, and the first negative pressure conveying plate (62) retreats to one side of the first feed roller group (4), and the second negative pressure conveying plate (63) retreats to one side of the second feed roller group (5).

3. A forming process for a soft-pack battery cell according to claim 1, characterized in that: A glue sticking telescopic platform (7) is provided above and below the working area, and the two glue sticking telescopic platforms (7) are arranged opposite to each other, and the first double-sided adhesive tape (2) and the second double-sided adhesive tape (3) are both double-sided adhesive tapes in the form of rolls with multiple fixed lengths; The glue laminating telescopic platform (7) comprises a telescopic frame (71), a lifting drive (72), a first material roller (73), a second material roller (74), a supporting roller (75), a material pressing block (76) and a material pressing wheel (77); The lifting drive (72) drives the telescopic frame to extend and retract; The first material roller (73) and the second material roller (74) are both rotatably arranged in the telescopic frame, the first material roller (73) is used to convey the rolled double-sided adhesive tape, and the second material roller (74) is used to roll up the release paper of the rolled double-sided adhesive tape; There are a plurality of support rollers (75), and the plurality of support rollers (75) are rotatably arranged on both sides of the telescopic frame and are used to guide the release paper of the rolled double-sided adhesive tape; The pressing block (76) is arranged in the middle of the telescopic frame, extends out of the telescopic frame and is frictionally connected to the release paper of the roll-shaped double-sided adhesive tape. A telescopic member (761) is arranged at one end of the pressing block (76) connected to the telescopic frame, and is connected to the telescopic frame via the telescopic member (761); There are two pressing wheels (77), which are respectively arranged on both sides of the pressing block (76). The pressing wheels (77) are hinged to the telescopic frame, and a reset member (771) is arranged at the hinge between the pressing wheels (77) and the telescopic frame.

4. A forming process for a soft-pack battery cell according to claim 3, characterized in that: The method of bonding the first isolation film (11) and the second isolation film (12) by the adhesive bonding telescopic platform (7): A5. The roll of double-sided adhesive tape is placed on the first material roller (73), and the release paper of the roll of double-sided adhesive tape is wound on the second material roller (74) via the support roller (75) and the pressing block (76). The first material roller (73) and the second material roller (74) work simultaneously. The fixed-length double-sided adhesive tape of the roll of double-sided adhesive tape is conveyed to the end of the telescopic frame along with the winding of the release paper, and the pressing block (76) pushes the middle part of the fixed-length double-sided adhesive tape out of the telescopic frame through the release paper. A6. The lifting drivers (72) of the two adhesive-applying telescopic platforms (7) simultaneously drive the telescopic frames to extend, and the two pressing blocks (76) simultaneously stick the middle part of the fixed-length double-sided adhesive tape to the joint of the first isolation film (11) and the second isolation film (12) through the release paper; the two telescopic frames continue to approach each other, and the pressing wheels (77) of the two adhesive-applying telescopic platforms (7) contact each other, and roll along the two ends of the fixed-length double-sided adhesive tape against the release paper and move away from each other, so that the fixed-length double-sided adhesive tape is completely stuck to the two ends of the joint of the first isolation film (11) and the second isolation film (12); A7. After the first isolation film (11) and the second isolation film (12) are bonded to form the isolation film strip, the lifting drivers (72) of the two adhesive bonding telescopic platforms (7) simultaneously drive the telescopic frames to retract, and the two telescopic frames continue to move away from each other. The reset member (771) is restored, and the pressing wheel (77) is reset along with the restoration of the reset member (771). The two pressing blocks (76) are also separated from each other, and the two adhesive bonding telescopic platforms (7) exit the working area.

5. The forming process of a soft-pack battery cell according to claim 1, characterized in that: A winding device (8) is provided on one side of the working area, and the winding device (8) comprises a clamping fixture (81) for fixing the heat conducting member (13) and a winding driver (82) for driving the clamping fixture (81) to rotate and retract; Working method of winding device (8): B1. Fix the heat conducting member (13) vertically on the clamping fixture (81); B2. The winding drive (82) drives the clamping fixture (81) to extend into the working area so that the slot (133) of the heat conducting member (13) is inserted into the joint of the first isolation membrane (11) and the second isolation membrane (12); B3. The winding drive (82) drives the clamping fixture (81) to rotate counterclockwise by 90°, and the heat conductive member (13) is transformed from a vertical shape to a horizontal shape, so that the heat conductive member (13) is respectively bonded to the second adhesive surface of the first double-sided tape (2) located on one side of the second isolation film (12) and to the second adhesive surface of the second double-sided tape (3) located on one side of the first isolation film (11), thereby fixing the heat conductive member (13) to the first isolation film (11) and the second isolation film (12), respectively.

6. A forming process for a soft-pack battery cell according to claim 1, characterized in that: A pole piece attaching robot (9) is arranged outside the working area, and the pole piece attaching robot (9) comprises a negative pressure suction cup (91) and a clamping finger (92); A method for fixing a positive electrode sheet (14) to a first isolation film (11) and a negative electrode sheet (15) to a second isolation film (12): C1. Using the negative pressure suction cup (91) of the manipulator, one end of the positive electrode sheet (14) is transported to a side of the first double-sided tape (2) where the second adhesive surface is located on the first isolation film (11), and the clamping fingers (92) clamp the positive electrode sheet (14) and the heat-conducting portion (132) of the heat-conducting member (13) so that the positive electrode sheet (14) is fixed to the first isolation film (11); C2. Using the negative pressure suction cup (91) of the manipulator, one end of the negative electrode sheet (15) is attached to the second adhesive surface of the second double-sided tape (3) on one side of the second isolation film (12), and the clamping fingers (92) clamp the negative electrode sheet (15) and the heat conductive portion (132) of the heat conductive member (13) so that the negative electrode sheet (15) is fixed to the second isolation film (12).

7. A forming process for a soft-pack battery cell according to claim 1, characterized in that: The positive electrode sheet (14) and the negative electrode sheet (15) both comprise a first current collector (191), a heat conductive layer (192), a second current collector (193), a first material layer (194), and a second material layer (195); The first current collector (191) and the second current collector (193) are respectively fixed to the two sides of the heat conductive layer (192), the first material layer (194) is fixed to the first current collector (191), and the second material layer (195) is fixed to the first current collector (191).

8. A forming process for a soft-pack battery cell according to claim 7, characterized in that: A blank area is provided at one end of the positive electrode sheet (14) fixed to the first isolation film (11) and at one end of the negative electrode sheet (15) fixed to the second isolation film (12), and the heat conductive layers (192) of the positive electrode sheet (14) and the negative electrode sheet (15) extend into the blank area.

9. A battery, characterized in that: It comprises a shell and a battery cell arranged in the shell, wherein the battery cell comprises a soft-pack battery cell (1) made by the molding process of the soft-pack battery cell according to any one of claims 1 to 8.

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