Laminated battery cell with staggered positive and negative pole pieces and manufacturing method of laminated battery cell

Abstract

The invention discloses a manufacturing method of a laminated battery cell with staggered positive and negative pole pieces, which comprises the following steps: step 1, respectively cutting a positive material strip and a negative material strip into positive pole pieces and negative pole pieces with the same size, treating the positive pole pieces to form positive pole surfaces and positive pole lugs, and treating the negative pole pieces to form negative pole surfaces; processing the negative pole piece to form a negative pole surface and a negative pole lug, wherein the positive pole surface and the negative pole surface have the same size; 2, repeatedly stacking the positive pole piece, the negative pole piece and the diaphragm strip according to the sequence of the diaphragm, the positive pole piece, the diaphragm and the negative pole piece; 3, compacting all the positive tabs, and compacting all the negative tabs; according to the manufacturing method of the laminated battery cell with the staggered positive and negative pole pieces, the stability and the performance of the battery are improved, the manufacturing process is simplified, the manufacturing cost is reduced, and a new technical direction and possibility are brought to the battery industry.

Description

Technical Field

[0001] This invention relates to the field of stacked battery technology, and more specifically, to a stacked battery cell with alternating positive and negative electrode plates and its manufacturing method. Background Technology

[0002] The energy storage industry is developing rapidly, but battery technology remains the biggest constraint. Based on the manufacturing method, battery cells can be broadly classified into two categories: stacked and wound. Stacked cells involve cutting the positive and negative electrode sheets and separator to specific sizes, then stacking the positive electrode sheet, separator, and negative electrode sheet to form a small battery cell, and finally stacking and connecting these small cells in parallel to form a large battery cell.

[0003] Existing stacked batteries are plug-in type. In batteries stacked in the above manner, the C-shaped plug-in connection of the positive and negative electrodes is difficult to compact due to the metal elasticity of the electrodes, resulting in uneven spacing, easy peeling of the electrode coating, and multiple processes. As a result, the yield of the battery is reduced, and the corresponding defective batteries still need to be reworked, increasing the production cycle.

[0004] Patent application CN115763680A discloses a stacked battery cell and its manufacturing method. It uses two electrodes with the same polarity coating area to form a C-shaped structure through an empty foil area. The positive and negative electrodes are folded in a C-shape and need to be interlocked. Due to the large area of ​​the electrode coating area and the small C-shaped opening of the empty foil area, the interlocking is difficult. In order to facilitate the interlocking of the positive and negative electrodes and the separator, a certain spacing is set in the C-shaped opening to give the separator a certain margin. Since the C-shaped metal electrode is elastic, there are too many gaps between the electrodes and the separator when they are interlocked, which need to be compacted. This will cause the separator to wrinkle, affecting the spacing between the electrodes and the uniformity of the electrolyte, and thus affecting the performance and safety of the battery.

[0005] In view of this, the inventors conducted in-depth research to address this need, which led to the present invention. Summary of the Invention

[0006] To overcome the problems of uneven spacing, easy peeling of electrode coating, and multiple processes in existing stacked battery technology, such as the difficulty in compacting the C-shaped insertion of positive and negative electrode sheets due to the metal elasticity of the positive and negative electrode sheets, and the need for multiple processes, this invention provides a stacked battery cell with alternating positive and negative electrode sheets. This not only improves the stability and performance of the battery, but also simplifies the manufacturing process, reduces manufacturing costs, and brings new technological directions and possibilities to the battery industry.

[0007] A method for manufacturing a laminated battery cell with alternating positive and negative electrode plates, characterized by comprising the following steps:

[0008] Step 1: Cut the positive electrode strip and the negative electrode strip into positive electrode sheets and negative electrode sheets of the same size. Process the positive electrode sheets to form a positive electrode surface and a positive electrode tab. Process the negative electrode sheets to form a negative electrode surface and a negative electrode tab. The positive electrode surface and the negative electrode surface are the same size. The positive electrode tab and the negative electrode tab are the same size.

[0009] Step 2: Stack the positive electrode, negative electrode, and separator strip repeatedly in the order of separator, positive electrode, separator, and negative electrode.

[0010] Step 3: Compact and weld all positive tabs, and compact and weld all negative tabs.

[0011] In step two, the diaphragm strip is repeatedly inserted in an S-shape around the positive and negative electrode plates to isolate them.

[0012] The diaphragm strip is inserted in the width direction of the positive and negative electrode plates, and the width direction of the positive and negative electrode plates is perpendicular to the orientation of the positive and negative electrode tabs.

[0013] The width of the diaphragm strip is slightly greater than the length of the positive and negative electrode surfaces.

[0014] The diaphragm covers the positive and negative electrode areas with the same area.

[0015] In step two, the positive electrode surface of the positive electrode plate overlaps with the negative electrode surface of the negative electrode plate, and the positive electrode tab and the negative electrode tab extend from the overlapping area from both sides.

[0016] The spacing between adjacent positive and negative electrode surfaces is the same.

[0017] A laminated battery cell with alternating positive and negative electrode plates is prepared using the aforementioned manufacturing method.

[0018] A battery comprising the aforementioned stacked cells.

[0019] Beneficial effects:

[0020] The beneficial effects of adopting the technical solution of this invention are as follows:

[0021] Optimized stacking improves battery stability: Traditional intercalation methods are difficult to manufacture and may cause wrinkles in the separator. These wrinkles affect the spacing between electrodes and the uniformity of the electrolyte, further reducing battery performance and safety. However, the stacking method proposed in this application successfully avoids this problem. Compared to the C-shaped structure, which may result in uneven spacing and electrode detachment, the stacking method ensures uniform spacing between electrodes, making the electrolyte distribution between the separator and electrodes more uniform, thereby improving the overall battery performance.

[0022] Simplified electrode stacking and compaction process: By staggering the positive and negative electrode plates in the same direction along the separator, excess areas are formed at both ends of the positive and negative electrodes in the same direction. This design simplifies the compaction process of the positive and negative electrode tabs, making operation easier, improving conductivity, and reducing battery manufacturing time and cost.

[0023] More thorough electrode isolation enhances safety: Because the positive and negative electrodes are stacked in a staggered manner, they are separated more thoroughly under the protection of the separator. This design avoids potential inadequate separation between the positive and negative electrodes on both sides of the separator, thereby further ensuring battery safety.

[0024] Precision cutting and optimization: By precisely cutting the positive and negative electrode strips into electrode sheets of the same size and performing special treatment on the electrode sheets, the consistency of the electrode surface size is ensured, which helps to improve the consistency and reliability of the battery.

[0025] High-efficiency isolation: The diaphragm strips are repeatedly interwoven in a specific order to form an S-shaped structure, which ensures effective isolation between the positive and negative electrode plates and reduces the risk of short circuit.

[0026] Ordered structure: The direction of the separator strips is consistent with the width direction of the electrode sheets. The ordered structural design helps to improve the stability of the battery.

[0027] Sufficient coverage: The width of the separator strip is slightly larger than the length of the positive and negative electrode surfaces, ensuring that the separator fully covers the positive and negative electrodes, thereby increasing battery safety.

[0028] Uniform distribution: The coverage areas of the positive and negative electrodes are exactly the same, which helps to distribute the current evenly and improve the performance of the battery.

[0029] Neat arrangement: The tabs of the positive and negative electrodes extend evenly from both sides, making the cell structure more compact and helping to improve the energy density of the battery.

[0030] Consistent spacing: The spacing between adjacent positive and negative electrode surfaces is the same. This design further ensures uniform current distribution and helps extend battery life.

[0031] Wide adaptability: The manufacturing method of this battery cell is both specific and flexible, and can be applied to various different battery cell manufacturing needs.

[0032] Complete battery solution: By combining this special stacked cell, the battery can not only provide stable power output, but also has long life and high safety.

[0033] In summary, the manufacturing method provided in this application brings significant benefits to battery manufacturing. It not only improves battery stability and performance but also simplifies the manufacturing process, reduces manufacturing costs, and brings new technological directions and possibilities to the battery industry. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0035] Figure 1 This is a process flow diagram of the manufacturing process of the laminated battery cell of the present invention;

[0036] Figure 2 This is a schematic diagram of the vertical cross-section of the stacked battery cell of the present invention;

[0037] Figure 3 This is a vertical cross-sectional side view of the stacked battery cell of the present invention;

[0038] Figure 4 This is a top view schematic diagram of the stacked battery cell of the present invention.

[0039] In the diagram: 1. Positive electrode plate; 11. Positive electrode tab; 12. Positive electrode surface; 2. Negative electrode plate; 21. Negative electrode tab; 22. Negative electrode surface; 3. Diaphragm strip. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] like Figure 1 As shown, a method for manufacturing a laminated battery cell with alternating positive and negative electrode plates is characterized by comprising the following steps:

[0042] Step 1: Cut the positive electrode strip and the negative electrode strip into positive electrode sheets and negative electrode sheets of the same size. Process the positive electrode sheets to form a positive electrode surface and a positive electrode tab. Process the negative electrode sheets to form a negative electrode surface and a negative electrode tab. The positive electrode surface and the negative electrode surface are the same size. The positive electrode tab and the negative electrode tab are the same size.

[0043] Step 2: Stack the positive electrode, negative electrode, and separator strip repeatedly in the order of separator, positive electrode, separator, and negative electrode.

[0044] Step 3: Compact and weld all positive tabs, and compact and weld all negative tabs.

[0045] Furthermore, in step two, the diaphragm strip is repeatedly inserted in an S-shape around the positive and negative electrode plates to isolate them.

[0046] Furthermore, the insertion direction of the diaphragm strip is the width direction of the positive electrode and the negative electrode, and the width direction of the positive electrode and the negative electrode is perpendicular to the orientation of the positive electrode tab and the negative electrode tab.

[0047] Furthermore, the width of the diaphragm strip is slightly greater than the length of the positive and negative electrode surfaces.

[0048] Furthermore, the diaphragm covers the same area of ​​the positive and negative electrode tab regions.

[0049] Furthermore, in step two, the positive electrode surface of the positive electrode plate overlaps with the negative electrode surface of the negative electrode plate, and the positive electrode tab and the negative electrode tab extend from the overlapping area from both sides respectively.

[0050] Furthermore, the spacing between adjacent positive and negative electrode surfaces is the same.

[0051] A laminated battery cell with alternating positive and negative electrode plates is prepared using the aforementioned manufacturing method.

[0052] A battery comprising the aforementioned stacked cells.

[0053] The structures of the two laminated cells obtained using this embodiment are further described through examples.

[0054] like Figure 2-3 As shown, a stacked battery cell includes a battery cell body, which comprises a plurality of stacked battery cell units. Each battery cell unit includes a positive electrode 1, a negative electrode 2, and a separator strip 3. The positive electrode 1 and the negative electrode 2 are stacked alternately. The positive electrode 1 is composed of a positive electrode surface 12 and a positive electrode tab 11, and the negative electrode 2 is composed of a negative electrode surface 22 and a negative electrode tab 21. The stacked areas are the positive electrode surface 12 and the negative electrode surface 22, respectively. The separator strip 3 is used to form the battery cell unit between the positive electrode 1 and the negative electrode 2.

[0055] The positive electrode 1 and the negative electrode 2 are the same size, and the positive electrode surface 12 and the negative electrode surface 22 are the same size and overlap.

[0056] The width of the diaphragm strip 3 is greater than the length of the positive electrode surface 12 and the negative electrode surface 22. The diaphragm strip 3 is folded beyond the area of ​​the positive electrode surface 12 and the negative electrode surface 22, covering part of the positive electrode tab 11 and the negative electrode tab 21.

[0057] All the diaphragm strips 3 on the main body of the battery cell are formed by folding the positive electrode plate 1 and the negative electrode plate 2 in an S-shape along the length of the diaphragm strip 3.

[0058] The width of the diaphragm strip is slightly greater than the length of the positive and negative electrode surfaces; the exposed length of the positive electrode tab 11 is the same as the exposed length of the negative electrode tab 21.

[0059] The manufacturing method and application of a laminated battery cell with alternating positive and negative electrode plates are as follows:

[0060] Preparation method:

[0061] Cutting process:

[0062] Equipment: Cutting machine

[0063] Description: The positive and negative electrode strips are cut into positive electrode sheets 1 and negative electrode sheets 2 of specified dimensions using a cutting machine. The precision of the cutting machine ensures the consistency of the dimensions of the cut electrode sheets.

[0064] Electrode treatment:

[0065] Equipment: Electrode processing equipment

[0066] Description: Positive electrode 1 and negative electrode 2 are processed by an electrode processing device to form a positive electrode surface 12, a positive electrode tab 11, a negative electrode surface 22, and a negative electrode tab 21. The device involves operations such as coating, surface treatment, and drying.

[0067] Diaphragm strip preparation:

[0068] Equipment: Diaphragm strip manufacturing machine

[0069] Description: Fabricate and cut diaphragm strips 3 to meet requirements. Ensure the flatness and dimensional accuracy of diaphragm strips 3.

[0070] Stacking operations:

[0071] Equipment: Stacking machine

[0072] Description: Using a stacking machine, electrodes are repeatedly stacked in the order of "diaphragm, positive electrode 1, diaphragm, negative electrode 2". The stacking machine ensures stability as the diaphragm strip 3 repeatedly weaves around the positive and negative electrodes in an S-shape.

[0073] Tab compaction operation:

[0074] Equipment: Compactor

[0075] Description: All positive electrode tabs 11 and negative electrode tabs 21 are compacted using a compactor. This ensures conductivity and electrode integrity.

[0076] Electrolyte filling:

[0077] Equipment: Electrolyte filling equipment

[0078] Description: After the laminated battery cell is fabricated, an electrolyte filling device is used to uniformly inject the electrolyte to ensure that the electrolyte is evenly distributed in the battery cell.

[0079] Packaging:

[0080] Equipment: Vacuum sealing machine

[0081] Description: Vacuum sealing machines are used to encapsulate stacked battery cells in a specific environment to ensure that there are no impurities or oxygen inside the battery.

[0082] application:

[0083] Using the above-mentioned manufacturing method and corresponding equipment, a stacked battery cell with alternating positive and negative electrode plates can be effectively prepared.

[0084] The stacked cell can be further applied to a battery characterized by including the stacked cell, providing stable and safe electrical energy for various electronic devices, power tools, electric vehicles, etc.

[0085] By comprehensively using the above-mentioned equipment and processes, the quality and performance of the battery cells can be ensured, meeting the needs of modern battery technology.

[0086] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A method for manufacturing a stacked electrode cell with positive and negative electrode sheets arranged alternately, characterized by, The method comprises the following steps: Step one, cutting the positive and negative electrode material belts into positive and negative electrode sheets with the same size, processing the positive electrode sheets to form positive electrode surfaces and positive electrode tabs, and processing the negative electrode sheets to form negative electrode surfaces and negative electrode tabs, the positive and negative electrode surfaces having the same size, and the positive and negative electrode tabs having the same size; Step two, repeatedly stacking the positive and negative electrode sheets and the separator strip in the order of separator, positive electrode sheet, separator, and negative electrode sheet; Step three, compacting and welding all the positive electrode tabs, and compacting and welding all the negative electrode tabs.

2. The method of claim 1, wherein the method further comprises: stacking the positive electrode sheet and the negative electrode sheet alternately. In step two, the separator strip is repeatedly inserted into the positive and negative electrode sheets in an S shape to isolate the positive and negative electrode sheets.

3. The method according to claim 2, wherein the method is characterized in that: The insertion direction of the separator strip is the width direction of the positive and negative electrode sheets, and the width direction of the positive and negative electrode sheets is perpendicular to the orientation of the positive and negative electrode tabs.

4. The method of claim 3, wherein the method further comprises: The width of the separator strip is greater than the length of the positive and negative electrode surfaces.

5. The method of claim 4, wherein the method further comprises: The area of the positive and negative electrode tab areas covered by the separator is the same and less than one fourth of the area of the tab area.

6. The method of claim 1, wherein the method further comprises: In step two, the positive electrode surface of the positive electrode sheet and the negative electrode surface of the negative electrode sheet are oppositely overlapped, and the positive and negative electrode tabs respectively extend out of the overlapping area from both sides.

7. The method according to claim 6, wherein the method is characterized by: The distance between adjacent positive and negative electrode surfaces is the same.

8. A jelly-roll battery cell with positive and negative electrode sheets arranged in an interleaved manner, characterized in that: The method is prepared by any one of claims 1-7.

9. A battery, characterized by: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the following steps: The method comprises the

Images