Battery piece lamination device

Abstract

The utility model provides a battery piece lamination device which comprises a transfer mechanism and a smoothing mechanism, and the smoothing mechanism is arranged on the transfer mechanism. According to the device, the smoothing mechanism is arranged on the transfer mechanism, so that the diaphragms can be smoothed and supported in the lamination process, the problem of wrinkles of the diaphragms is effectively solved, and the lamination quality and efficiency are improved. The lamination device is simple in structure and easy to implement, does not obviously increase the complexity and the cost of equipment, and is suitable for a lamination process in lithium ion battery production.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium ion battery manufacturing equipment technical field, concretely relates to a battery piece lamination device. BACKGROUND

[0002] Lithium ion batteries are widely used in electronic devices, electric vehicles and other fields. In the production process of lithium ion batteries, the lamination process is a key link, and its quality directly affects the performance and life of the battery.

[0003] The existing lamination process usually includes the process of laminating the positive electrode sheet, the negative electrode sheet and the separator according to a specific order. In this process, the flatness of the separator is an important quality indicator. However, since the separator material is usually thin and soft, it is easy to wrinkle during the lamination process, especially when the separator width is wide.

[0004] At present, the common lamination equipment mainly includes transfer mechanism, swing mechanism and lamination platform and other components. The transfer mechanism is responsible for grabbing and placing the electrode sheet, the swing mechanism is used to guide the movement of the separator, and the lamination platform is used to receive the laminated battery unit. However, this structure often has difficulty in effectively controlling the tension of the separator when dealing with wide-width separators, resulting in wrinkles in the separator during transfer and lamination.

[0005] The wrinkles of the separator not only affect the thickness uniformity of the battery unit, but also may cause internal short circuit and other safety hazards of the battery. In addition, the existence of wrinkles also reduces the capacity and cycle performance of the battery. Although the wrinkles can be reduced by increasing the tension of the separator, excessive tension may cause deformation or damage of the separator. UTILITY MODEL CONTENTS

[0006] The purpose of the utility model is to provide a battery piece lamination device to solve the problem of wrinkles in the separator during the lamination process in the prior art.

[0007] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0008] A battery piece lamination device is provided, which comprises a transfer mechanism and a smoothing mechanism, the smoothing mechanism is arranged on the transfer mechanism, and the smoothing mechanism is used to smooth the separator during lamination.

[0009] The transfer mechanism comprises a positive electrode lamination transfer suction disc and a negative electrode lamination transfer suction disc, and the smoothing mechanism comprises a smoothing roller, which is rotatably arranged on the positive electrode lamination transfer suction disc and the negative electrode lamination transfer suction disc respectively.

[0010] Specifically, the smoothing roller is cylindrical.

[0011] More specifically, the roll diameter of the smoothing roller is 10-30mm;

[0012] Further, the smoothing mechanism further comprises a mounting fixing plate, and the smoothing mechanism is fixed on the transfer mechanism through the mounting fixing plate.

[0013] Further, the battery sheet stacking device further comprises a swing mechanism, and the swing mechanism is arranged on the working path of the transfer mechanism.

[0014] Specifically, the swing mechanism comprises a diaphragm swing roller.

[0015] More specifically, the swing mechanism comprises a diaphragm swing roller, and the diaphragm swing roller is arranged on the working path of the transfer mechanism.

[0016] Further, the battery sheet stacking device further comprises a stacking platform, and the stacking platform is located below the transfer mechanism.

[0017] In addition, the battery sheet stacking device further comprises a pole piece supply platform, and the pole piece supply platform is located on the material taking path of the transfer mechanism.

[0018] Specifically, the pole piece supply platform comprises a negative electrode deviation rectifying platform and a positive electrode deviation rectifying platform, the negative electrode deviation rectifying platform is located on one side of the stacking platform, and the positive electrode deviation rectifying platform is located on the other side of the stacking platform.

[0019] The battery sheet stacking device has the following beneficial effects:

[0020] The battery sheet stacking device provided by the utility model realizes real-time smoothing and supporting of the diaphragm in the stacking process through the setting of the smoothing mechanism on the transfer mechanism. The structure design effectively reduces the generation of diaphragm wrinkles and improves the stacking quality and consistency. The effect of the smoothing mechanism is not limited to eliminating the formed wrinkles, and more importantly, the formation of wrinkles is prevented, so that the flatness of the diaphragm in the stacking process is ensured. The active prevention method is more effective than the traditional passive correction method, and the yield of the stacking can be improved. At the same time, the setting of the smoothing mechanism does not significantly increase the complexity and cost of the equipment, and is easy to implement and popularize on the existing equipment. The simple and effective improvement scheme improves the stacking efficiency and reduces the performance decline and safety hazards of the battery caused by the diaphragm wrinkles, and has certain significance for improving the overall quality and reliability of the lithium ion battery.

[0021] Further, the smoothing mechanism in the utility model adopts rotatable cylindrical smoothing roller, the roll diameter is 10-30mm, this design can smooth diaphragm and avoid mechanical damage to diaphragm to the greatest extent. The cylindrical design of smoothing roller ensures the uniform contact area with diaphragm, avoids local stress concentration. The rotatable characteristic reduces the friction between diaphragm and smoothing roller, further reduces the damage risk to diaphragm. Through the installation fixed plate, the smoothing mechanism is fixed on the lamination transfer chuck, realizes the stability and reliability of structure, guarantees the consistency and durability of smoothing effect. In addition, the utility model also includes swing mechanism, lamination platform and pole piece supply platform, the consistent arrangement and cooperative work of these components further optimize the whole lamination process. The setting of swing mechanism helps the uniform spreading of diaphragm, reduces the uneven tension of diaphragm in the horizontal direction;The design of lamination platform ensures the accurate positioning and lamination of pole piece;The configuration of pole piece supply platform optimizes the transfer process of pole piece, reduces the deformation risk of pole piece in the transfer process. The comprehensive effect of these improvements not only improves the precision and efficiency of lamination process, but also further enhances the controllability and stability of the whole lamination process, lays the foundation for producing high-quality lithium ion battery. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is the structural schematic diagram of battery piece lamination device in an embodiment of the utility model;

[0023] Figure 2 It is the front view of positive pole piece transfer chuck in an embodiment of the utility model;

[0024] Figure 3 It is the plan view of positive pole piece transfer chuck in an embodiment of the utility model.

[0025] Mark explanation in drawing: 1, negative pole rectification platform, 2, negative pole piece transfer chuck, 3, lamination platform, 4, smoothing roller, 5, diaphragm swing roller, 6, positive pole rectification platform, 7, positive pole piece transfer chuck. DETAILED DESCRIPTION

[0026] The technical scheme of the utility model will be described in detail below in combination with the drawings and specific embodiments. It should be noted that the described embodiments are only used to explain the technical principles of the utility model, and not to limit the protection scope thereof. Those skilled in the art should understand that, without departing from the spirit and scope of the utility model, various modifications, changes or equivalent replacements can be made to these embodiments. These modifications, changes or equivalent replacements should be considered to fall within the protection scope defined in the claims of the utility model.

[0027] As Figures 1-3As shown, this utility model provides a battery cell stacking device, which includes a transfer mechanism and a smoothing mechanism, wherein the smoothing mechanism is disposed on the transfer mechanism.

[0028] In this embodiment, the transfer mechanism includes a negative electrode stack transfer chuck 2. The specific structure and working principle of the negative electrode stack transfer chuck 2 are common knowledge to those skilled in the art and will not be described in detail here.

[0029] The smoothing mechanism includes a smoothing roller 4, which is rotatably mounted on the negative electrode stack transfer suction cup 2. Preferably, the smoothing roller 4 is cylindrical. More preferably, the roller diameter of the smoothing roller 4 is 10-30 mm. In this embodiment, the roller diameter of the smoothing roller 4 is 20 mm.

[0030] The smoothing mechanism is fixed to the negative electrode stack transfer suction cup 2 by a mounting plate. Specifically, the mounting plate can be a plate-like structure made of metal, connected to the negative electrode stack transfer suction cup 2 and the smoothing roller 4 by bolts or welding. The specific fixing method of the mounting plate is a common practice for those skilled in the art and will not be described in detail here.

[0031] In this embodiment, the cell stacking device further includes a swing mechanism. The swing mechanism is disposed on the working path of the transfer mechanism. Specifically, the swing mechanism includes a diaphragm swing roller 5. The diaphragm swing roller 5 can reciprocate in the horizontal direction to guide the movement of the diaphragm. The diaphragm swing roller 5 can adopt a design from the prior art.

[0032] In addition, the solar cell stacking device also includes a stacking platform 3. The stacking platform 3 is located below the transfer mechanism and is used to receive the electrode sheets transferred from the transfer mechanism.

[0033] The battery cell stacking device also includes an electrode supply platform. The electrode supply platform is located on the material handling path of the transfer mechanism and is used to supply electrodes to the transfer mechanism. In this embodiment, the electrode supply platform includes a negative electrode correction platform 1 and a positive electrode correction platform 6.

[0034] In the prior art, firstly, the diaphragm swing roller 5 oscillates left and right to release the diaphragm. When the diaphragm swing roller 5 oscillates towards the positive electrode correction platform 6, the negative electrode stack transfer suction cup 2 picks up the electrode sheet from the negative electrode correction platform 1 and places it on the stack platform 3, after which the negative electrode stack transfer suction cup 2 returns to the negative electrode correction platform 1. Next, the diaphragm swing roller 5 moves to the negative electrode correction platform 1 side, and the positive electrode stack transfer suction cup 7 picks up the electrode sheet from the positive electrode correction platform 6 and places it on the stack platform 3, after which the positive electrode stack transfer suction cup 7 returns to the positive electrode correction platform 6. Then, the diaphragm swing roller 5 moves to the positive electrode correction platform 6 side again, repeating the above process.

[0035] During this reciprocating motion, the wide width of the diaphragm makes tension control difficult, easily leading to wrinkles. At this point, the smoothing roller 4, mounted on the negative electrode stacking transfer suction cup 2, comes into play. As the smoothing roller 4 moves towards the stacking platform 3, it first contacts the diaphragm, smoothing and supporting it. The negative electrode stacking transfer suction cup 2 then places the electrode sheet onto the stacking platform 3, effectively solving the diaphragm wrinkling problem.

[0036] The cylindrical design and appropriate roller diameter (20mm in this embodiment) of the smoothing roller 4 ensure that the diaphragm is not damaged during the smoothing process. Simultaneously, the smoothing roller 4 is securely fixed to the negative electrode stack transfer chuck 2 by a mounting plate, allowing the smoothing roller 4 to rotate only relative to the negative electrode stack transfer chuck 2, thus ensuring the stability and reliability of the entire smoothing process.

[0037] Based on the above embodiments, this utility model also provides a preferred embodiment. In this preferred embodiment, a smoothing roller is provided not only on the negative electrode stacking transfer chuck, but also on the positive electrode stacking transfer chuck.

[0038] Specifically, such as Figure 1 As shown, a smoothing roller 4 is provided on the negative electrode stacking transfer suction cup 2. Simultaneously, a smoothing roller is also provided on the positive electrode stacking transfer suction cup 7. The structure, dimensions, and installation method of the smoothing roller on the positive electrode stacking transfer suction cup 7 are the same as or similar to those of the smoothing roller 4 on the negative electrode stacking transfer suction cup 2. Preferably, both smoothing rollers are cylindrical, with a roller diameter in the range of 10-30 mm, more preferably 20 mm. These smoothing rollers are all fixed to their respective stacking transfer suction cups by mounting plates.

[0039] In this bilateral smoothing implementation, the lamination process is as follows:

[0040] First, the diaphragm swing roller 5 swings back and forth to release the diaphragm. When the diaphragm swing roller 5 swings towards the positive electrode correction platform 6, the negative electrode stack transfer chuck 2 picks up the negative electrode sheet from the negative electrode correction platform 1 and moves it towards the stack platform 3. During this process, the smoothing roller 4 on it smooths the diaphragm, and then the negative electrode sheet is placed on the stack platform 3. Afterward, the negative electrode stack transfer chuck 2 returns to the negative electrode correction platform 1. Next, the diaphragm swing roller 5 moves to the side of the negative electrode correction platform 1, and the positive electrode stack transfer chuck 7 picks up the positive electrode sheet from the positive electrode correction platform 6 and moves it towards the stack platform 3. During this process, the smoothing roller on it smooths the diaphragm, and then the positive electrode sheet is placed on the stack platform 3. Afterward, the positive electrode stack transfer chuck 7 returns to the positive electrode correction platform 6.

[0041] This double-sided smoothing design further improves the smoothing effect of the separator. At each stage of the stacking process, whether placing the negative or positive electrode, the separator can be effectively smoothed and supported. This design not only more comprehensively solves the problem of separator wrinkles but also further improves the quality and efficiency of stacking.

[0042] The battery cell stacking device provided by this utility model, by setting a smoothing mechanism on the transfer mechanism, can smooth and support the separator during the stacking process. This structural design effectively reduces the generation of separator wrinkles and improves the stacking quality and consistency. The smoothing mechanism adopts a rotatable cylindrical smoothing roller, which is designed to effectively smooth the separator while minimizing damage to the separator.

[0043] The smoothing roller is connected to the stacking transfer suction cup via a mounting plate. This connection method improves the stability and reliability of the structure, helping to ensure consistent smoothing results. The addition of the smoothing roller does not significantly increase the complexity or cost of the equipment, making it easy to implement and promote on existing equipment.

[0044] The battery cell stacking device of this invention also includes a swing mechanism, a stacking platform, and an electrode supply platform. The rational arrangement and coordinated operation of these components further improve the accuracy and efficiency of the stacking process. The swing mechanism helps to ensure the uniform spreading of the separator, while the configuration of the stacking platform and the electrode supply platform optimizes the transfer and stacking process of the electrodes.

[0045] This utility model has been described in detail through the above specific embodiments. However, it should be understood that the above content is illustrative only and is not intended to limit the scope of this utility model. Those skilled in the art can make various modifications and variations to this utility model according to specific application scenarios and actual needs without departing from the spirit and scope of this utility model, and such modifications and variations are all within the protection scope of this utility model.

Claims

1. A battery cell stacking device, characterized in that, include: A transfer mechanism and a smoothing mechanism, wherein the smoothing mechanism is disposed on the transfer mechanism and is used to smooth the diaphragm during stacking; The transfer mechanism includes a positive electrode stack transfer chuck and a negative electrode stack transfer chuck, and the smoothing mechanism includes a smoothing roller, which is rotatably mounted on the positive electrode stack transfer chuck and the negative electrode stack transfer chuck, respectively.

2. The battery cell stacking device according to claim 1, characterized in that, The smoothing roller is cylindrical.

3. The battery cell stacking device according to claim 2, characterized in that, The diameter of the smoothing roller is 10-30mm.

4. The battery cell stacking device according to claim 1, characterized in that, It also includes a mounting plate, through which the smoothing mechanism is fixed to the transfer mechanism.

5. The battery cell stacking device according to claim 1, characterized in that, Also includes: A swing mechanism is provided on the working path of the transfer mechanism.

6. The battery cell stacking apparatus according to claim 5, characterized in that, The oscillating mechanism includes a diaphragm oscillating roller, which is disposed on the working path of the transfer mechanism.

7. The battery cell stacking apparatus according to claim 1, characterized in that, Also includes: A stacking platform is located below the transfer mechanism.

8. The battery cell stacking apparatus according to claim 7, characterized in that, Also includes: An electrode supply platform is located on the material handling path of the transfer mechanism.

9. The battery cell stacking apparatus according to claim 8, characterized in that, The electrode supply platform includes a negative electrode correction platform and a positive electrode correction platform. The negative electrode correction platform is located on one side of the stacking platform, and the positive electrode correction platform is located on the other side of the stacking platform.

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