Lamination equipment of soft package lithium battery and lamination production process

Abstract

The invention relates to the technical field of battery lamination, in particular to lamination equipment of a soft package lithium battery, which comprises two diaphragm winding mechanisms suitable for winding and unwinding diaphragms; the positive electrode thermal compounding mechanism is positioned on one diaphragm winding mechanism, is arranged along the diaphragm feeding direction and is used for compounding a positive electrode plate and a diaphragm into a positive electrode semi-composite part; the positive electrode plate feeding mechanism is used for conveying a positive electrode plate to the positive electrode thermal compounding mechanism; the negative electrode thermal compounding mechanism is located on the other diaphragm winding mechanism and arranged in the diaphragm feeding direction, and a negative electrode piece and the diaphragm are compounded into a negative electrode semi-composite part; the negative electrode plate feeding mechanism is used for conveying a negative electrode plate to the negative electrode thermal compounding mechanism; the thermal laminating mechanism is used for laminating the positive electrode semi-composite part and the negative electrode semi-composite part to form a complete composite part; a pressure sensor is arranged in the hot laminating mechanism; the hot laminating mechanism is provided with a first dust sticking roller and a second dust sticking roller, a first static electricity eliminator is arranged beside the first dust sticking roller, and a second static electricity eliminator is arranged beside the second dust sticking roller.

Description

Technical Field

[0001] The present invention relates to the technical field of battery lamination, and in particular to a lamination device and a lamination production process for soft-pack lithium batteries. Background Art

[0002] Existing lithium batteries can be divided into two categories: lithium metal batteries and lithium ion batteries. Soft-pack lithium batteries are liquid lithium ion batteries covered with a polymer shell, and are structurally packaged with aluminum-plastic composite film. Due to the advantages of light weight, low mold opening cost, and high safety, the market share of soft-pack lithium batteries has gradually expanded. In the event of safety hazards, soft-pack lithium batteries will only bulge and crack at most. An important link in the existing lithium battery processing is lamination. Lamination is the process of thermally compounding the positive electrode sheet, the negative electrode sheet and the diaphragm. This process is completed on a laminating machine. Existing laminating machines generally compound the strip-shaped diaphragm with the strip or single-sheet electrode sheet to form a composite. However, during the lamination process, it is easy to cause the diaphragm to be damaged due to improper operation or foreign matter mixed into the diaphragm, thereby causing a short circuit of the soft-pack lithium battery, causing serious problems such as battery heating, bulging, and even explosion, reducing the service life of the soft-pack lithium battery. Summary of the invention

[0003] The purpose of the present invention is to provide a lamination device for soft-pack lithium batteries to address the deficiencies of the prior art, effectively remove dust and foreign matter from the diaphragm, reduce the mixing of foreign matter into the diaphragm, and improve the working accuracy of working parts, thereby reducing diaphragm damage and extending the service life of soft-pack lithium batteries.

[0004] The present invention also provides a lamination production process for soft-pack lithium batteries, which improves lamination production efficiency, has good heat dissipation effect and long service life.

[0005] To achieve the above-mentioned purpose, a lamination device for a soft-pack lithium battery of the present invention includes two diaphragm winding mechanisms, which are suitable for winding and releasing diaphragms; a positive electrode thermal composite mechanism, located at one of the diaphragm winding mechanisms, which is arranged along the direction of diaphragm feeding and is suitable for composite the positive electrode sheet and the diaphragm into a positive electrode semi-composite; a positive electrode sheet feeding mechanism, which is suitable for conveying the positive electrode sheet to the positive electrode thermal composite mechanism; a negative electrode thermal composite mechanism, located at the other of the diaphragm winding mechanisms, which is arranged along the direction of diaphragm feeding and is suitable for composite the negative electrode sheet and the diaphragm into a negative electrode semi-composite; a negative electrode sheet feeding mechanism, which is suitable for conveying the negative electrode sheet to the negative electrode thermal composite mechanism; a thermal bonding mechanism, which is used to press the positive electrode semi-composite and the negative electrode semi-composite to form a complete composite; a pressure sensor is arranged in the thermal bonding mechanism; a first sticky roller and a second sticky roller are arranged on the front side of the thermal bonding mechanism, a first static eliminator is arranged on the side of the first sticky roller, and a second static eliminator is arranged on the side of the second sticky roller.

[0006] Preferably, it also includes a positive electrode positioning mechanism, which is arranged between the positive electrode thermal composite mechanism and the diaphragm winding mechanism, and is suitable for correcting and straightening the positive electrode semi-composite component; it also includes a negative electrode positioning mechanism, which is arranged between the negative electrode thermal composite mechanism and the diaphragm winding mechanism, and is suitable for correcting and straightening the negative electrode semi-composite component.

[0007] Preferably, two guide wheels are further included, which are respectively arranged between the two diaphragm winding mechanisms and the positive electrode positioning mechanism and the negative electrode positioning mechanism, and are suitable for guiding the diaphragm to extend toward the direction close to the positive electrode thermal composite mechanism or the negative electrode thermal composite mechanism.

[0008] Preferably, it further comprises a cutting station, which is located at the front side of the thermal bonding mechanism along the material moving direction and is suitable for cutting the composite parts output by the thermal bonding mechanism.

[0009] Preferably, it also includes a material receiving box, which is arranged below the cutting table.

[0010] The present invention also provides a lamination production process for soft-pack lithium batteries, using the above-mentioned lamination equipment for soft-pack lithium batteries, including the following steps: preparing a positive electrode sheet, the positive electrode sheet is provided with at least two positive electrode sheet tabs by ultrasonic welding; preparing a negative electrode sheet, the negative electrode sheet is provided with at least two negative electrode sheet tabs by ultrasonic welding; preparing a diaphragm, and pressing and forming the diaphragm laminating device on the left and right sides; according to the production requirements of the soft-pack lithium battery, laminating and combining the positive electrode sheet, the diaphragm and the negative electrode sheet in a prescribed lamination sequence to obtain a battery sheet; placing the battery sheet on a workbench of a laminating machine, and then using a bonding machine to bond the battery sheets together, the bonding machine will spray or apply the adhesive evenly on the contact surface of the battery sheet, and then press them together. Together, this can ensure that the battery cells are firmly bonded; after the bonding is completed, the battery cells are transferred to the pressing machine for pressing and curing. The pressing machine will apply a certain pressure and temperature to make the adhesive cure within a certain period of time, which can ensure that the battery cells are firmly bonded and form an overall battery structure; the battery structure after lamination needs to be inspected and quality controlled, which includes inspecting the size, thickness, shape, etc. of the battery cells and ensuring that they meet the specified requirements. If the battery cells are defective or unqualified, they will be rejected or repaired; packaging and encapsulation: After lamination is completed, the soft-pack lithium battery needs to be packaged and encapsulated, which usually includes placing the battery structure into a soft-pack shell and sealing it.

[0011] Preferably, the preparation of the positive electrode sheet includes the following steps: dividing the aluminum foil strip into a plurality of positive electrode sheet areas; mixing the lithium cobalt oxide material, the adhesive and the additive to form a paste-like adhesive coating on the plurality of positive electrode sheet areas; rolling the aluminum foil strip after the coating; and die-cutting the rolled aluminum foil strip to obtain a plurality of positive electrode sheets.

[0012] Preferably, the preparation of the negative electrode sheet comprises the following steps: dividing the copper foil strip into a plurality of negative electrode sheet areas; mixing natural graphite material, adhesive and additive to form a paste adhesive coating on the plurality of negative electrode sheet areas; rolling the copper foil strip after the coating; and die-cutting the copper foil strip after the rolling operation to obtain a plurality of negative electrode sheets.

[0013] Preferably, the separator is a "Z"-shaped folded structure, and several groups of positive electrode sheets and negative electrode sheets are alternately inserted into the separator, and multiple groups of positive electrode sheets and negative electrode sheets are wrapped by the separator to form a stacked structure.

[0014] Beneficial effects of the present invention: A lamination device for a soft-pack lithium battery effectively removes dust and foreign matter from the diaphragm, reduces the mixing of foreign matter into the diaphragm, and improves the working accuracy of the working parts, thereby reducing diaphragm damage and extending the service life of the soft-pack lithium battery. A lamination production process for a soft-pack lithium battery is also provided, which improves the lamination production efficiency, has good heat dissipation effect, and has a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention.

[0016] Figure 2 It is a schematic structural diagram of the positive electrode sheet, the separator and the negative electrode sheet arranged in sequence according to the present invention.

[0017] Figure 3 It is a process flow chart of the present invention.

[0018] Reference numerals include:

[0019] 1. Diaphragm winding mechanism; 2. Positive electrode thermal composite mechanism; 3. Positive electrode sheet feeding mechanism; 4. Negative electrode thermal composite mechanism; 5. Negative electrode sheet feeding mechanism; 6. Thermal bonding mechanism; 7. Positive electrode positioning mechanism; 8. Negative electrode positioning mechanism; 9. First sticky roller; 10. Second sticky roller; 11. Guide wheel; 12. Cutting table; 13. Material collection box; 14. First static eliminator; 15. Second static eliminator; 16. Pressure sensor. DETAILED DESCRIPTION

[0020] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0021] like Figures 1 to 3As shown, a lamination device for a soft-pack lithium battery of the present invention comprises two diaphragm winding mechanisms, which are suitable for winding and releasing diaphragms; a positive electrode thermal composite mechanism, located at one of the diaphragm winding mechanisms, which is arranged along the direction of diaphragm feeding and is suitable for composite the positive electrode sheet and the diaphragm into a positive electrode semi-composite; a positive electrode sheet feeding mechanism, which is suitable for conveying the positive electrode sheet to the positive electrode thermal composite mechanism; a negative electrode thermal composite mechanism, located at the other of the diaphragm winding mechanisms, which is arranged along the direction of diaphragm feeding and is suitable for composite the negative electrode sheet and the diaphragm into a negative electrode semi-composite; a negative electrode sheet feeding mechanism, which is suitable for conveying the negative electrode sheet to the negative electrode thermal composite mechanism; a thermal bonding mechanism, which is used to press the positive electrode semi-composite and the negative electrode semi-composite to form a complete composite; a pressure sensor is arranged in the thermal bonding mechanism; a first sticky roller and a second sticky roller are arranged on the front side of the thermal bonding mechanism, a first static eliminator is arranged on the side of the first sticky roller, and a second static eliminator is arranged on the side of the second sticky roller.

[0022] During operation, the diaphragm winding mechanism 1 is mainly used for winding and releasing the diaphragm. Therefore, it can be realized by adopting the winding machine of the prior art. The positive electrode thermal composite mechanism 2 and the negative electrode thermal composite mechanism 4 are located on the front side of the moving direction of the diaphragm. The positive electrode thermal composite mechanism 2 and the positive electrode sheet feeding mechanism 3 cooperate with each other to composite the positive electrode sheet with the diaphragm of one diaphragm winding mechanism 1 into a positive electrode semi-composite. Then, the static electricity on the surface of the positive electrode semi-composite is neutralized by the first static eliminator 14, and then the first dust-sticking roller 9 is used to better adhere and remove dust and foreign matter on the surface. The negative electrode thermal composite mechanism 4 and the negative electrode sheet feeding mechanism 5 cooperate with each other to composite the negative electrode sheet with the diaphragm of another diaphragm winding mechanism 1 into a negative electrode semi-composite. Then, the static electricity on the surface of the negative electrode semi-composite is neutralized by the second static eliminator 15, and then the second dust-sticking roller 10 is used to better adhere and remove dust and foreign matter on the surface. A pressure sensor 16 is provided in the heat bonding mechanism 6 to effectively and accurately measure the pressing and forming force between the positive electrode semi-composite and the negative electrode semi-composite, to avoid excessive pressing force causing the diaphragm to be pierced and damaged, and to protect the structural stability of the diaphragm. The positive electrode heat bonding mechanism 2 can use the existing heat bonding machine used for the heat bonding of lithium battery stacks, specifically including heaters, pressure rollers, etc. The positive electrode sheet feeding mechanism 3 is suitable for conveying the positive electrode sheet to the positive electrode heat bonding mechanism 2. Specifically, the positive electrode sheet feeding mechanism 3 realizes the clamping and transfer of the single-sheet positive electrode sheet. What kind of structure can be used to realize the clamping and transfer of the sheet structure is easy to design for people in this field. The negative electrode heat bonding mechanism 4 is located on the front side of another diaphragm winding mechanism 1 along the material movement direction, and is suitable for compounding the negative electrode sheet with the diaphragm of another diaphragm winding mechanism 1 into a negative electrode semi-composite. The negative electrode heat bonding mechanism 4 can use the existing heat bonding machine used for the heat bonding of lithium battery stacks, specifically including heaters, pressure rollers, etc. The negative electrode sheet feeding mechanism 5 is suitable for conveying the negative electrode sheet to the negative electrode thermal composite mechanism 4. The negative electrode sheet feeding mechanism 5 realizes the clamping and transfer of the single-sheet negative electrode sheet. What kind of structure can realize the clamping and transfer of the sheet structure is easy to design by people in this field. The thermal bonding mechanism 6 is located at the front side of the positive electrode thermal composite mechanism 2 and the negative electrode thermal composite mechanism 4 along the material movement direction, and is suitable for compounding the positive electrode semi-composite and the negative electrode semi-composite into a composite. The thermal bonding mechanism 6 and the positive / negative electrode thermal composite mechanism 4 have the same structure. The thermal bonding mechanism 6 is located at the front side of the positive electrode thermal composite mechanism 2 and the negative electrode thermal composite mechanism 4 along the material movement direction, and is suitable for compounding the positive electrode semi-composite and the negative electrode semi-composite into a composite. The thermal bonding mechanism 6 and the positive / negative electrode thermal composite mechanism 4 have the same structure.The positive electrode positioning mechanism 7 is arranged between the diaphragm winding mechanism 1 and the positive electrode thermal composite mechanism 2, and is suitable for correcting the diaphragm corresponding to the diaphragm winding mechanism 1; specifically, a common structure used in the art to achieve film material positioning and correction can be adopted; the negative electrode positioning mechanism 8 is arranged between the diaphragm winding mechanism 1 and the negative electrode thermal composite mechanism 4, and is suitable for correcting the diaphragm corresponding to the diaphragm winding mechanism 1; specifically, a common structure used in the art to achieve film material positioning and correction can be adopted. The present invention effectively removes dust and foreign matter from the diaphragm, reduces the mixing of foreign matter into the diaphragm, and improves the working accuracy of the working parts, thereby reducing diaphragm damage and extending the service life of the soft-pack lithium battery.

[0023] The present embodiment also includes a positive electrode positioning mechanism 7, which is arranged between the positive electrode thermal composite mechanism 2 and the diaphragm winding mechanism 1, and is suitable for correcting and guiding the semi-composite part of the positive electrode thermal composite mechanism 2; specifically, a common structure used in the field to achieve film material positioning and correction can be adopted; and also includes a negative electrode positioning mechanism 8, which is arranged between the negative electrode thermal composite mechanism 4 and the diaphragm winding mechanism 1, and is suitable for correcting and guiding the semi-composite part of the negative electrode thermal composite mechanism 4; specifically, a common structure used in the field to achieve film material positioning and correction can be adopted.

[0024] The two guide wheels 11 of this embodiment are respectively arranged between the two diaphragm winding mechanisms 1 and the positive electrode positioning mechanism 7 and the negative electrode positioning mechanism 8, and are suitable for guiding the diaphragm to extend in a direction close to the positive electrode thermal composite mechanism 2 or the negative electrode thermal composite mechanism 4. The guide wheel 11 can change the direction of travel of the diaphragm so as to better meet the needs of the subsequent thermal composite mechanism. Specifically, the guide wheel 11 can be set as an adjustable structure so as to be adjusted according to the thermal composite mechanism.

[0025] In this embodiment, the positive electrode thermal composite mechanism 2 and the negative electrode thermal composite mechanism 4 have a guide structure suitable for guiding and positioning the separator, and / or the thermal bonding mechanism 6 has a guide structure suitable for guiding and positioning the semi-composite. The guide structure can further improve the composite accuracy. In specific implementation, the two sets of separator winding mechanisms 1 can be vertically distributed up and down, or horizontally distributed left and right.

[0026] The cutting table 12 of this embodiment is located at the front side of the thermal bonding mechanism 6 along the material moving direction, and is suitable for cutting the composite parts output by the thermal bonding mechanism 6. The specific cutting structure can adopt the existing structure in the field. The cutting and laminating machine of this embodiment integrates lamination and cutting together, making the processing more continuous and improving the processing efficiency.

[0027] The material collecting box 13 of this embodiment is located below the cutting table 12. Preferably, the material collecting box 13 is a clip-type material collecting box 13. The so-called clip-type material collecting box 13 is a plurality of workstations evenly distributed along the circumferential direction of the turntable. Each workstation is provided with a collection box for receiving products, and is equipped with a sensor and a controller. The sensor is used to detect the number of products in the collection box. After the controller receives the product full signal sent by the sensor, it controls the turntable to rotate until the next workstation rotates to the receiving position. The specific turntable axis can be set horizontally or vertically.

[0028] The present invention also provides a lamination production process for soft-pack lithium batteries, using the above-mentioned lamination equipment for soft-pack lithium batteries, including the following steps: preparing a positive electrode sheet, the positive electrode sheet is provided with at least two positive electrode sheet tabs by ultrasonic welding; preparing a negative electrode sheet, the negative electrode sheet is provided with at least two negative electrode sheet tabs by ultrasonic welding; preparing a diaphragm, and pressing and forming the diaphragm laminating device on the left and right sides; according to the production requirements of the soft-pack lithium battery, laminating and combining the positive electrode sheet, the diaphragm and the negative electrode sheet in a prescribed lamination sequence to obtain a battery sheet; placing the battery sheet on a workbench of a laminating machine, and then using a bonding machine to bond the battery sheets together, the bonding machine will spray or apply the adhesive evenly on the contact surface of the battery sheet, and then press them together. Together, this can ensure that the battery cells are firmly bonded; after the bonding is completed, the battery cells are transferred to the laminating machine for compaction and curing. The laminating machine will apply a certain amount of pressure and temperature to allow the adhesive to cure within a certain period of time, which can ensure that the battery cells are firmly bonded and form an integral battery structure; the battery structure after lamination needs to be inspected and quality controlled, which includes inspecting the size, thickness, shape, etc. of the battery cells and ensuring that they meet the specified requirements. If the battery cells are defective or unqualified, they will be removed or repaired; packaging and encapsulation: after the lamination is completed, the soft-pack lithium battery needs to be packaged and encapsulated, which usually includes placing the battery structure into the soft-pack shell and sealing it. The work efficiency is high, and the tabs are usually made of conductive materials. Among them, copper is one of the most commonly used materials, with excellent conductivity and high corrosion resistance. The general copper tabs are made by stamping, cutting and other processes.

[0029] The preparation of the positive electrode sheet in this embodiment includes the following steps: dividing the aluminum foil strip into a plurality of positive electrode sections; mixing the lithium cobalt oxide material, the adhesive and the additive to form a paste adhesive coating on the plurality of positive electrode sections; rolling the aluminum foil strip after the coating; and die-cutting the aluminum foil strip after the rolling operation to obtain a plurality of positive electrode sheets. Among them, lithium cobalt oxide (LiCoO2): lithium cobalt oxide is one of the most commonly used positive electrode materials, with a high specific capacity and a good cycle life, and is widely used in most lithium batteries.

[0030] The preparation of the negative electrode sheet of this embodiment includes the following steps: dividing the copper foil strip into a plurality of negative electrode sheet areas; mixing natural graphite material, adhesive and additive to form a paste adhesive coating on the plurality of negative electrode sheet areas; rolling the copper foil strip after coating; and die-cutting the copper foil strip after rolling to obtain a plurality of negative electrode sheets. Among them, natural graphite: natural graphite is one of the most commonly used negative electrode materials, with high specific capacity and good conductivity.

[0031] The diaphragm of this embodiment is a "Z"-shaped folding structure, and several groups of positive and negative plates are alternately inserted into the diaphragm, and multiple groups of positive and negative plates are wrapped by the diaphragm to form a laminated structure. The battery cell composed of the positive plate, negative plate and diaphragm is welded with positive plates and negative plates on the outside. The positive plates and negative plates can increase the overall structural strength of the soft-pack lithium battery, and at the same time have the effect of absorbing and dissipating heat. At least two pole ear structures are used at both ends of the positive and negative electrode groups to reduce the current flow path. Compared with the parallel structure of the pole ear designed on one side, the internal resistance of the lithium battery group can be smaller, reducing the problems of battery internal resistance power consumption and heat generation.

[0032] The diaphragm of a soft-pack lithium battery refers to a thin film material used to isolate the positive and negative electrodes. The diaphragm plays an important role in lithium batteries. It can prevent direct contact between the positive and negative electrodes and prevent safety problems such as short circuits and overcurrent. The diaphragm of a soft-pack lithium battery is usually made of polymer materials, such as polypropylene, polyethylene, etc. These materials have high electrochemical stability, thermal stability and mechanical strength, and can provide good isolation effect and mechanical support. The selection of diaphragms has an important impact on the performance and safety of lithium batteries. Suitable diaphragm materials can provide lower internal resistance and higher electrical conductivity, thereby improving the output performance of the battery. At the same time, good diaphragm materials can also prevent excessive migration of lithium ions, reduce capacity attenuation and safety risks. In addition to the selection of materials, the thickness and pore size of the diaphragm will also affect the performance of lithium batteries. Thinner diaphragms can increase the energy density of the battery, but they will also increase the risk of short circuits. Therefore, the design of the diaphragm needs to comprehensively consider factors such as material performance, thickness and pore size to achieve optimal battery performance and safety.

[0033] The aluminum-plastic film of soft-pack lithium batteries refers to a composite film used to wrap the positive and negative electrode materials of the battery. The aluminum-plastic film is usually composed of aluminum foil and plastic film layers, and has good electrical insulation properties, mechanical strength and corrosion resistance. The aluminum-plastic film plays an important role in soft-pack lithium batteries. As the outer wrapping material of the battery, it can provide structural support for the battery, prevent the positive and negative electrode materials inside the battery from direct contact, and isolate the battery from the external environment, protecting the battery from physical damage and electrochemical corrosion from the outside. The selection of aluminum-plastic film also has a certain impact on the performance and safety of lithium batteries. Suitable aluminum-plastic film can provide sufficient mechanical strength to prevent the battery from deformation and rupture during use. In addition, the aluminum-plastic film also needs to have high electrical insulation properties to avoid short circuits between the positive and negative electrodes. In the manufacturing process of soft-pack lithium batteries, the aluminum-plastic film undergoes process steps such as compounding, cutting and forming, and finally forms the positive and negative electrode wrapping layer of the battery. The performance and quality of the aluminum-plastic film have an important impact on the safety, capacity and cycle life of the battery, so the quality of the aluminum-plastic film needs to be strictly controlled and tested during the production process.

[0034] 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 lamination device for soft-pack lithium batteries, characterized in that: It includes two diaphragm winding mechanisms, suitable for winding and releasing the diaphragm; A positive electrode thermal composite mechanism is located in one of the diaphragm winding mechanisms and is arranged along the diaphragm feeding direction, and is suitable for composite the positive electrode sheet and the diaphragm into a positive electrode semi-composite member; A positive electrode sheet feeding mechanism, adapted to convey the positive electrode sheet to the positive electrode thermal recombination mechanism; A negative electrode thermal composite mechanism is located at the other side of the separator winding mechanism and is arranged along the separator feeding direction, and is suitable for composite the negative electrode sheet and the separator into a negative electrode semi-composite member; A negative electrode sheet feeding mechanism, adapted to convey the negative electrode sheet to the negative electrode thermal recombination mechanism; A heat bonding mechanism, used to press the positive electrode semi-composite component and the negative electrode semi-composite component to form a complete composite component; A pressure sensor is provided in the heat bonding mechanism; A first sticky roller and a second sticky roller are arranged on the front side of the heat bonding mechanism, a first static eliminator is arranged on the side of the first sticky roller, and a second static eliminator is arranged on the side of the second sticky roller.

2. The lamination device for a soft-pack lithium battery according to claim 1, characterized in that: It also includes a positive electrode positioning mechanism, which is arranged between the positive electrode thermal composite mechanism and the diaphragm winding mechanism, and is suitable for correcting and straightening the positive electrode semi-composite component; it also includes a negative electrode positioning mechanism, which is arranged between the negative electrode thermal composite mechanism and the diaphragm winding mechanism, and is suitable for correcting and straightening the negative electrode semi-composite component.

3. The lamination device for a soft-pack lithium battery according to claim 1, characterized in that: It also includes two guide wheels, which are respectively arranged between the two diaphragm winding mechanisms and the positive electrode positioning mechanism and the negative electrode positioning mechanism, and are suitable for guiding the diaphragm to extend toward the direction close to the positive electrode thermal composite mechanism or the negative electrode thermal composite mechanism.

4. The lamination device for a soft-pack lithium battery according to claim 1, characterized in that: It also includes a cutting station, which is located at the front side of the thermal bonding mechanism along the material moving direction and is suitable for cutting the composite parts output by the thermal bonding mechanism.

5. The lamination equipment for soft-pack lithium batteries according to claim 4, characterized in that: It also includes a material receiving box, which is arranged below the cutting table.

6. A lamination production process for soft-pack lithium batteries, characterized in that: A lamination device for a soft-pack lithium battery as claimed in any one of claims 1 to 5 comprises the following steps: Prepare a positive electrode sheet, wherein the positive electrode sheet is provided with at least two positive electrode tabs by ultrasonic welding; Prepare a negative electrode sheet, wherein the negative electrode sheet is provided with at least two negative electrode tabs by ultrasonic welding; Prepare the diaphragm, and press it into shape by the diaphragm pressing device; According to the production requirements of soft-pack lithium batteries, the positive electrode sheet, the separator and the negative electrode sheet are stacked in a prescribed stacking order to obtain a battery cell; Place the battery cells on the workbench of the stacking machine, and then use a bonding machine to bond the battery cells together. The bonding machine will spray or apply the adhesive evenly on the contact surface of the battery cells, and then press them together, which can ensure that the battery cells are firmly bonded; After the bonding is completed, the battery cells are transferred to the laminating machine for compaction and curing. The laminating machine will apply a certain pressure and temperature to make the adhesive cure within a certain period of time, so as to ensure that the battery cells are firmly bonded and form an integral battery structure. After lamination, the battery structure needs to be inspected and quality controlled, which includes inspecting the size, thickness, shape, etc. of the battery cells and ensuring that they meet the specified requirements. If the battery cells are defective or unqualified, they will be removed or repaired. Packaging and encapsulation: After lamination, the soft-pack lithium battery needs to be packaged and encapsulated, which usually includes placing the battery structure into a soft-pack shell and sealing it.

7. The lamination production process of a soft-pack lithium battery according to claim 6, characterized in that: The preparation of the positive electrode sheet comprises the following steps: Divide the aluminum foil strip into a plurality of positive electrode areas; Mixing lithium cobalt oxide material, a binder and an additive to form a paste adhesive coating on multiple positive electrode areas; The aluminum foil strip after coating is subjected to roller pressing operation; The aluminum foil strip that has been rolled is die-cut to obtain a plurality of positive electrode sheets.

8. The lamination production process of a soft-pack lithium battery according to claim 7, characterized in that: The preparation of the negative electrode sheet comprises the following steps: Divide the copper foil strip into a plurality of negative electrode areas; Mixing natural graphite material, binder and additive to form a paste adhesive coating on multiple negative electrode sheet areas; The copper foil strip after coating is subjected to roller pressing operation; The copper foil strip that has been rolled is die-cut to obtain a plurality of negative electrode sheets.

9. The lamination production process of a soft-pack lithium battery according to claim 8, characterized in that: The diaphragm is a "Z"-shaped folded structure, and several groups of positive electrode sheets and negative electrode sheets are alternately inserted into the diaphragm, and multiple groups of positive electrode sheets and negative electrode sheets are wrapped by the diaphragm to form a stacked structure.

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