Soft package battery lamination process

Abstract

The invention relates to the technical field of batteries, in particular to a soft package battery lamination process which comprises the following steps: preparing a positive electrode roll material, a negative electrode roll material, a diaphragm material and a tab; covering the two surfaces of the positive electrode of the positive electrode roll material with the diaphragm material; vertically placing the positive electrode roll material and the negative electrode roll material, and folding to a preset layer number to obtain a semi-finished product; welding a tab on the semi-finished product; and inspecting the folding quality of the semi-finished product to obtain the soft package battery cell. Complete positive and negative electrode roll materials are directly used for stacking, a series of processes for cutting the pole pieces are omitted, the production efficiency is improved, the positive electrode and the negative electrode are integrated, the displacement resistance borne by the positive electrode and the negative electrode is extremely high, the probability of pole piece displacement is greatly reduced under the conditions of vibration and collision, the safety of the battery cell is improved, and the production cost is reduced. Therefore, the problem of low production efficiency of the existing soft package battery lamination process is solved.

Description

Technical Field

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

[0002] The soft pack battery stacking process is to stack the positive and negative electrodes layer by layer to a certain number of layers, and use a separator to separate the positive and negative electrodes. The positive and negative electrode coils are cut to obtain rectangular electrode sheets, and then the electrode sheets and separators are stacked layer by layer. After the stacking is completed, the positive and negative electrode ears are welded.

[0003] In actual production, the traditional stacking process is prone to the phenomenon of mutual adsorption when stacking, requiring manual intervention to separate, resulting in reduced production efficiency. Since the electrodes of the battery cell are independent of each other, the electrodes are prone to displacement in a working environment with frequent vibrations or bumps, which will cause the battery life to be reduced or even a short circuit, reducing the reliability of the soft-pack battery. Summary of the invention

[0004] The purpose of the present invention is to provide a soft-pack battery lamination process, aiming to solve the problem of low production efficiency of the existing soft-pack battery lamination process.

[0005] To achieve the above object, the present invention provides a soft pack battery lamination process, comprising the following steps:

[0006] Prepare positive electrode coils, negative electrode coils, separator materials and tabs;

[0007] Covering the separator material on both sides of the positive electrode of the positive electrode coil;

[0008] The positive electrode coil and the negative electrode coil are placed vertically and folded to a preset number of layers to obtain a semi-finished product;

[0009] Welding the tab on the semi-finished product;

[0010] The folding quality of the semi-finished product is checked to obtain a soft-pack battery cell.

[0011] Among them, in “the separator material covers both positive electrode surfaces of the positive electrode coil”, the width of the coating material is greater than the width of the positive electrode material, and the greater width range is 5mm-10mm.

[0012] Among them, in "placing the positive electrode coil and the negative electrode coil vertically and folding them to a preset number of layers to obtain a semi-finished product", the folded length of the negative electrode coil is greater than that of the positive electrode material, which is greater than the length range of 2mm-3mm, and the folded width of the positive electrode material is greater than that of the negative electrode material, which is greater than the width range of 2mm-3mm.

[0013] Among them, in "preparing positive electrode coils, negative electrode coils, separator materials and tabs", it includes:

[0014] Prepare positive electrode coils, positive and negative electrode coils, separator materials and tabs according to battery design specifications;

[0015] The coating process is controlled to reserve an uncoated empty narrow strip at each fold position of the positive electrode coil and the negative electrode coil.

[0016] Among them, in “covering the separator material on both sides of the positive electrode of the positive electrode coil”, the following steps are included:

[0017] Spreading the positive electrode coil flat on a workbench;

[0018] The separator material is finely covered on the positive electrode coil.

[0019] Among them, in “placing the positive electrode coil and the negative electrode coil vertically and folding them to a preset number of layers to obtain a semi-finished product”, the following steps are included:

[0020] Place the negative electrode coil on the workbench so that it is placed vertically with the positive electrode coil covered with the separator;

[0021] First, fold the negative electrode coil to cover part of the positive electrode coil, and then fold the positive electrode coil to cover the next part of the negative electrode coil;

[0022] The positive electrode coil and the negative electrode coil are folded alternately until a preset number of layers is reached.

[0023] Wherein, in “welding the pole ear on the semi-finished product”, the following steps are included:

[0024] Arranging the tabs at uncoated areas at the ends of the positive electrode coil and the negative electrode coil;

[0025] The tabs are welded based on a welding process.

[0026] A soft-pack battery lamination process of the present invention comprises the following steps: preparing a positive electrode coil, a negative electrode coil, a diaphragm material and a tab; covering the diaphragm material on both sides of the positive electrode of the positive electrode coil; vertically placing the positive electrode coil and the negative electrode coil and folding them to a preset number of layers to obtain a semi-finished product; welding the tab on the semi-finished product; and checking the folding quality of the semi-finished product to obtain a soft-pack battery cell. The positive and negative electrodes are not required to be cut into rectangular electrode sheets during lamination. Both the positive and negative electrodes are laminated using complete coils. The two sides of the positive electrode coil are covered with diaphragms respectively. The negative electrode coil and the positive electrode coil covered with the diaphragm are placed perpendicular to each other. The positive and negative electrodes are staggered and folded. The pole ears are welded to the uncoated areas at the ends of the coils after lamination is completed, and finally a complete soft-pack battery cell is obtained. The present invention directly uses complete positive and negative electrode coils for stacking, eliminating a series of processes for cutting the electrode sheets, thereby improving production efficiency. The positive and negative electrodes are both integral and are subject to extremely strong displacement resistance. In the event of vibration and bumping, the probability of electrode sheet displacement is greatly reduced, thereby improving the safety of the battery cell, thereby solving the problem of low production efficiency of the existing soft-pack battery lamination process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a flow chart of a soft-pack battery lamination process of the present invention.

[0029] Figure 2 It is a flow chart for preparing positive electrode coils, negative electrode coils, separator materials and tabs.

[0030] Figure 3 The present invention is a flow chart of covering the separator material on both sides of the positive electrode of the positive electrode roll.

[0031] Figure 4 The present invention is a flow chart of vertically placing the positive electrode coil and the negative electrode coil and folding them to a preset number of layers to obtain a semi-finished product.

[0032] Figure 5 It is a flow chart of welding the tab on the semi-finished product.

[0033] Figure 6 It is a schematic diagram of the stacking of the positive and negative electrodes and the separator of the present application.

[0034] Figure 7 It is a schematic diagram of the folding method of positive and negative electrodes (separated state).

[0035] Figure 8 It is a schematic diagram of the folding method of positive and negative electrodes (combined state).

[0036] Fig. 9 It is a schematic diagram of an empty narrow band. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0038] See also Figures 1 to 9 The present invention provides a soft-pack battery lamination process, comprising the following steps:

[0039] S1 prepares positive electrode coils, negative electrode coils, separator materials and tabs;

[0040] S11 prepares positive electrode coils, positive and negative electrode coils, separator materials and tabs according to battery design specifications;

[0041] Specifically, select the positive electrode coil according to the battery design specifications, and select the positive electrode coil of suitable size and material. Select the negative electrode coil according to the design specifications, and select the negative electrode coil that matches the positive electrode. Prepare the diaphragm material to ensure that the quality of the diaphragm material meets the standards and the width is slightly larger than the width of the positive electrode coil by 5-10mm. Prepare the tabs Prepare the tab materials suitable for connecting the positive and negative electrodes of the battery cell with the external circuit.

[0042] S12 controls the coating process to reserve an uncoated empty narrow strip at each fold position of the positive electrode coil and the negative electrode coil.

[0043] Specifically, the coating roller is replaced with a roller with grooves at certain intervals. The interval between each groove is the length of each coating area. When the aluminum foil or copper foil encounters the grooves, it cannot contact the grooves on the roller, thus forming an uncoated area. Each uncoated area corresponds to a crease position.

[0044] S2: Covering the separator material on both sides of the positive electrode of the positive electrode coil;

[0045] The width of the coating material is greater than the width of the positive electrode material, and the width range is 5mm-10mm.

[0046] S21: spreading the positive electrode coil flat on a workbench;

[0047] Specifically, make sure the workbench surface is flat, clean, free of impurities and scratches to avoid damage to the material. Unroll the positive electrode roll on the workbench to maintain the flatness and tension of the material.

[0048] S22: Cover the separator material on the positive electrode roll.

[0049] Specifically, check the diaphragm material to ensure that the width of the diaphragm material is slightly larger than the width of the positive electrode coil by 5-10mm to meet the requirements of full coverage and leaving margins. Precise alignment ensures that the diaphragm material is precisely aligned with the positive electrode coil during the covering process to avoid offset or misalignment. Spread the diaphragm material flat on the positive electrode coil to ensure that there are no bubbles, wrinkles or overlaps between the diaphragm and the positive electrode to ensure a good covering effect.

[0050] S3 vertically placing the positive electrode coil and the negative electrode coil and folding them to a preset number of layers to obtain a semi-finished product;

[0051] The folded length of the negative electrode material coil is greater than that of the positive electrode material, which is greater than the length range of 2mm-3mm, and the folded width of the positive electrode material is greater than that of the negative electrode material, which is greater than the width range of 2mm-3mm.

[0052] S31 placing the negative electrode coil on a workbench so that it is placed vertically with the positive electrode coil covered with the separator;

[0053] Specifically, the negative electrode coil is placed near the edge of the workbench to ensure that it is vertical to the positive electrode coil covered with the separator.

[0054] S32 first folds the negative electrode coil to cover a portion of the positive electrode coil, and then folds the positive electrode coil to cover the next portion of the negative electrode coil;

[0055] Specifically, the first part of the negative electrode coil is covered on the positive electrode coil according to the predetermined folding direction. The purpose of this step is to preliminarily establish the stacking relationship between the positive and negative electrodes. During the folding process, it is necessary to carefully check whether the negative electrode completely covers the positive electrode in the predetermined area to avoid any uncovered part.

[0056] S33 alternately folding the positive electrode coil and the negative electrode coil until a preset number of layers is reached.

[0057] Specifically, next, according to the predetermined folding direction, fold the first part of the positive electrode coil onto the negative electrode coil that has just been covered. At this time, the positive and negative electrodes should be separated by a diaphragm to ensure that there is no direct contact. According to the same pattern, the negative electrode is folded first and then the positive electrode, alternating until the preset number of layers or thickness is reached. Each step of folding should maintain precision and consistency to ensure the overall quality of the battery cell. During the folding process, it is necessary to ensure that the length of the negative electrode each fold is slightly larger than the width of the positive electrode on one side by 2-3mm. Similarly, the folding length of the positive electrode should also be slightly larger than the width of the positive electrode on one side by 2-3mm. As the folding proceeds, it should be ensured that the positive and negative electrode coils are stacked evenly and tightly to avoid gaps or misalignment.

[0058] S4 welding the tab on the semi-finished product;

[0059] S41: arranging the tabs at uncoated areas at the ends of the positive electrode coil and the negative electrode coil;

[0060] Specifically, the positive and negative electrode tabs are arranged in the corresponding uncoated areas, ensuring that the tabs are arranged neatly and fit tightly with the empty narrow strips to facilitate subsequent welding operations.

[0061] S42 welds the tab based on a welding process.

[0062] Specifically, according to the material and specifications of the tab, select the appropriate welding equipment for welding. Set the parameters of the welding equipment, start the welding equipment, and weld the tab. During the welding process, ensure that the welding point is firm, without defects such as cold welding and spatter. At the same time, pay attention to controlling the welding heat to avoid thermal damage to the surrounding materials. After welding is completed, carefully check the welding point to confirm whether the welding quality meets the requirements.

[0063] S5 checks the folding quality of the semi-finished product to obtain a soft-pack battery cell.

[0064] Specifically, carefully check the appearance of the folded battery cell to ensure that there are no wrinkles, cracks or dislocations; conduct necessary performance tests on the battery cell, including internal resistance, voltage, capacity, etc., to verify whether its performance meets the design requirements; after confirming that the battery cell quality is qualified, carry out packaging processing to form a complete soft-pack battery cell; conduct a final inspection on the packaged battery cell to ensure that there are no safety hazards such as leakage and short circuit.

[0065] The soft pack battery lamination process provided by the present invention has the following beneficial effects:

[0066] 1. A soft-pack battery stacking process is provided that directly uses complete positive and negative electrode coils for stacking, eliminating a series of processes for cutting the electrode sheets and improving production efficiency;

[0067] 2. A soft-pack battery stacking process is provided in which the positive and negative electrodes are integrated and are subject to extremely strong displacement resistance. In the event of vibration and bumping, the probability of electrode displacement is greatly reduced, thereby improving the safety of the battery cell.

[0068] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A soft pack battery lamination process, characterized in that: The following steps are involved: Prepare positive electrode coils, negative electrode coils, separator materials and tabs; Covering the separator material on both sides of the positive electrode of the positive electrode coil; The positive electrode coil and the negative electrode coil are placed vertically and folded to a preset number of layers to obtain a semi-finished product; Welding the tab on the semi-finished product; The folding quality of the semi-finished product is checked to obtain a soft-pack battery cell.

2. A soft pack battery lamination process as claimed in claim 1, characterized in that: In "the separator material covers both sides of the positive electrode of the positive electrode coil", the width of the coating material is greater than the width of the positive electrode material, and the greater width range is 5mm-10mm.

3. A soft pack battery lamination process as claimed in claim 1, characterized in that: In "placing the positive electrode coil and the negative electrode coil vertically and folding them to a preset number of layers to obtain a semi-finished product", the folded length of the negative electrode coil is greater than that of the positive electrode material, which is greater than the length range of 2mm-3mm, and the folded width of the positive electrode material is greater than that of the negative electrode material, which is greater than the width range of 2mm-3mm.

4. A soft pack battery lamination process as claimed in claim 1, characterized in that: In "Preparing positive electrode coils, negative electrode coils, separator materials and tabs", it includes: Prepare positive electrode coils, positive and negative electrode coils, separator materials and tabs according to battery design specifications; The coating process is controlled to reserve an uncoated empty narrow strip at each fold position of the positive electrode coil and the negative electrode coil.

5. A soft pack battery lamination process as claimed in claim 4, characterized in that: In “covering the separator material on both sides of the positive electrode of the positive electrode coil”, the following steps are included: Spreading the positive electrode coil flat on a workbench; The separator material is finely covered on the positive electrode coil.

6. A soft pack battery lamination process as claimed in claim 5, characterized in that: In “placing the positive electrode coil and the negative electrode coil vertically and folding them to a preset number of layers to obtain a semi-finished product”, the following steps are included: Place the negative electrode coil on the workbench so that it is placed vertically with the positive electrode coil covered with the separator; First, fold the negative electrode coil to cover part of the positive electrode coil, and then fold the positive electrode coil to cover the next part of the negative electrode coil; The positive electrode coil and the negative electrode coil are folded alternately until a preset number of layers is reached.

7. A soft pack battery lamination process as claimed in claim 5, characterized in that: In "welding the pole ear on the semi-finished product", the following steps are included: Arranging the tabs at uncoated areas at the ends of the positive electrode coil and the negative electrode coil; The electrode tab is welded based on a welding process.

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