Method for manufacturing a battery cell and a battery cell

Abstract

The present application relates to a method for manufacturing a debugging battery cell and a debugging battery cell. The method for manufacturing a debugging battery cell comprises the following steps: S1: providing a spacer film, stacking the spacer films together with the edges flush to obtain a stacked piece; wherein the thickness H of the spacer film is equal to the spacing thickness between adjacent foils of the battery cell to be debugged; S2: inserting a foil between each layer of the spacer film of the stacked piece to form a debugging battery cell; wherein each foil extends towards the long edge direction of the stacked piece, and the extended part forms a debugging tab. The debugging battery cell has the advantages of convenient manufacturing, low cost and good debugging effect.

Description

Technical Field

[0001] This invention relates to battery cell manufacturing processes, and in particular to a method for manufacturing and testing a battery cell. Background Technology

[0002] Ultrasonic welding is a key process in lithium-ion battery manufacturing, used to weld multiple layers of tabs or multiple layers of tabs to adapter plates. The cell structure is as follows: Figure 1 As shown, the positive and negative tabs extend from both sides. These tabs are ultrasonically welded to form the positive and negative electrodes of the battery cell. Because the positive foil of the tabs is coated on both sides, and the negative foil on both sides, and a separator exists between the positive and negative foils, gaps exist between the foils. When the tabs are compressed, they bend and retract. Before welding, the ultrasonic equipment needs to be adjusted to fine-tune the battery cell, mainly adjusting the solder joint position and welding effect to prevent tearing when the tabs bend and retract, ensuring the ultrasonic equipment achieves the best welding effect during processing.

[0003] Currently, the most commonly used debugging methods are multi-layer foil stacking and actual battery cells. Multi-layer foil stacking creates simulated tabs, which cannot be adjusted due to issues such as tab retraction position and tab tearing. Actual battery cell debugging suffers from problems such as poor stability of cells produced in the early stages of a new production line, high cost, and inability to be reused. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a method for manufacturing a test cell and a test cell. The test cell manufactured by this method uses a spacer film of a specific thickness to replace the thickness material between adjacent foils, simulating the specific structure of the cell, which facilitates the adjustment of the position of the tab tear and retraction. Moreover, the manufacturing method is simple and low in cost. After the foil is replaced after the test, it can be reused repeatedly. It has the advantages of convenient manufacturing, low cost and good testing effect.

[0005] This invention is achieved through the following scheme:

[0006] In a first aspect, the present invention provides a method for manufacturing a test cell, comprising the following steps:

[0007] Step S1: Provide a spacer film, and stack the spacer film together with its edges flush to obtain a stack; wherein, the thickness H of the spacer film is equal to the spacing thickness between adjacent foils of the cell to be regulated;

[0008] Step S2: Insert foil between each layer of the spacer film in the stack to form a test cell; wherein each foil extends toward the long side of the stack, and the extended portion forms a test tab.

[0009] Further, step S1 specifically includes step S11: providing a long strip spacer membrane, continuously folding it to form multiple layers of the spacer membrane; wherein, the long strip spacer membrane is stacked with its edges aligned during folding, so that the size of each folded surface is consistent, and the thickness of the long strip spacer membrane is H.

[0010] Further, the thickness H is the thickness H1 between two adjacent positive electrode foils or two adjacent negative electrode foils of the cell to be adjusted, the stacked components include two, and step S2 specifically includes:

[0011] Step S21: Insert a first foil between each of the spacer films of the first stack to form a positive electrode adjustment cell; wherein each of the first foils extends toward the long side of the stack, and the extended portion forms a positive electrode adjustment tab;

[0012] Step S22: Insert a second foil between each of the spacer films of the second stack to form a negative electrode adjustment cell; wherein each of the second foils extends toward the long side of the stack, and the extended portion forms a negative electrode adjustment tab.

[0013] Furthermore, the formula for calculating the thickness H1 is H1=(L2+L3+L4)×2+L1 or H1=(L2+L3+L4)×2+L5, where L2 is the thickness of the negative electrode foil coating of the cell to be adjusted, L3 is the thickness of the separator of the cell to be adjusted, L4 is the thickness of the positive electrode foil coating of the cell to be adjusted, L1 is the thickness of the negative electrode foil of the cell to be adjusted, and L5 is the thickness of the positive electrode foil of the cell to be adjusted.

[0014] Further, the thickness H is the thickness H2 between two adjacent foils of the cell to be adjusted, and step S2 specifically includes:

[0015] Alternating insertion of first foil and second foil between the spacer films of the stacked components forms a test cell; wherein each first foil extends toward a first long side of the stacked component, and the extended portion forms a positive test tab; each second foil extends toward a second long side of the stacked component, and the extended portion forms a negative test tab; wherein the direction of the second long side is opposite to the direction of the first long side.

[0016] Furthermore, the formula for calculating the thickness H2 is H2=L2+L3+L4, where L2 is the thickness of the negative electrode foil coating of the cell to be adjusted, L3 is the thickness of the separator of the cell to be adjusted, and L4 is the thickness of the positive electrode foil coating of the cell to be adjusted.

[0017] Furthermore, the first foil is aluminum foil; the second foil is copper foil.

[0018] Furthermore, the spacer membrane is a polyester membrane.

[0019] Secondly, the present invention also provides a method for adjusting the battery cell tabs, comprising the following steps:

[0020] Step S1: Provide a spacer film, and stack the spacer film together with its edges flush to obtain a stack; wherein, the thickness H of the spacer film is equal to the spacing thickness between adjacent foils of the cell to be regulated;

[0021] Step S2: Insert foil between each layer of the spacer film in the stack to form a test cell; wherein each foil extends toward the long side of the stack, and the extended portion forms a test tab;

[0022] Step S3: Perform ultrasonic welding on the adjustment tab.

[0023] Secondly, the present invention also provides a test cell, comprising a multilayer spacer film with flush edges, wherein the thickness H of the spacer film is equal to the spacing thickness between adjacent foils of the test cell.

[0024] A foil is inserted between each of the spacer membranes, and each foil extends toward the long side of the stack, with the extended portion forming a tuning tab.

[0025] The manufacturing method and the adjusted battery cell of the present invention have the following advantages:

[0026] 1. By stacking spacers flat, inserting foil between each layer of spacers, and extending the foil along the long side of the spacers to form adjustment tabs, a debugging cell is made to adjust the tabs. The adjustment tabs formed by the foil of this debugging cell are completely consistent with the tab structure of the real cell. When the adjustment tabs of this debugging cell are squeezed, due to the spacing thickness H of the spacers, the adjustment tabs will bend and shrink. During the adjustment process, the shrinkage position and tab tearing problem of the real cell are simulated. Moreover, the manufacturing method is simple, easy to produce, and has low production cost.

[0027] 2. By setting the separator membrane as a polyester membrane, the thickness of the polyester membrane can be adjusted during production as needed. It can be reused as the battery cell to be adjusted, and has the advantages of low cost and easy production.

[0028] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0029] Figure 1 This is a structural diagram of a battery cell described in the technical background of this invention;

[0030] Figure 2 This is a schematic diagram illustrating the fabrication of a battery cell to be adjusted according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic diagram of the structure of a battery cell to be adjusted according to an embodiment of the present invention;

[0032] Figure 4 This is a structural diagram of the actual battery cell to be adjusted as described in the embodiments of the present invention;

[0033] Figure 5 This is a schematic diagram of the structure of the spacer membrane of a battery cell to be regulated according to an embodiment of the present invention.

[0034] Reference numerals: Modulation cell 100, spacer 110, elongated spacer 111, foil 120, first foil 121, second foil 122, adjustment tab 130, positive adjustment tab 131, negative adjustment tab 132;

[0035] Battery cell 200, positive tab 210, negative tab 220;

[0036] Negative electrode foil 310, negative electrode foil coating 320, separator 330, positive electrode foil coating 340, positive electrode foil 350. Detailed Implementation

[0037] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0038] In the description of this invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0039] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0040] like Figure 1 As shown, Figure 1The battery cell structure, to be welded and tested, includes a battery cell body 200. Positive electrode tabs 210 and negative electrode tabs 220 extend from both sides of the battery cell body 200. The positive and negative electrode tabs are ultrasonically welded and then extruded together to form the positive and negative electrodes of the battery cell. Since the positive electrode foil 350 of the tabs is coated with a positive electrode foil coating 340 on both sides, and the negative electrode foil 310 is coated with a negative electrode foil coating 320 on both sides, and a separator 330 is provided between the positive electrode foil 350 and the negative electrode foil 310, therefore... Figure 4 As shown in the actual structural diagram of the battery cell to be adjusted, the actual battery cell is mainly composed of negative electrode foil coating 320, negative electrode foil 310, negative electrode foil coating 320, separator 330, positive electrode foil coating 340, positive electrode foil 350, and positive electrode foil coating 340 stacked in sequence. Therefore, there will be gaps between adjacent foils, which will bend and fold when the tabs are squeezed. Before welding, the ultrasonic equipment needs to be adjusted to weld the battery cell to be adjusted, mainly to adjust the solder mark position and welding effect, to avoid tearing when the tabs bend and fold, so that the ultrasonic equipment can achieve the best welding effect during processing.

[0041] Currently, the most commonly used debugging methods are multi-layer foil stacking and actual battery cells. Using multi-layer foil stacking to form simulated tabs is convenient and low-cost, but it is not suitable for debugging issues such as tab retraction position and tab tearing. Using actual battery cells for debugging has the problems of poor stability and high cost of battery cells produced in the early stages of new production lines, and the battery cells cannot be reused.

[0042] To address this technical problem, such as Figure 2 and Figure 3 As shown, this application provides a method for adjusting the tabs of a battery cell. This method uses an adjustment battery cell that simulates the specific structure of a battery cell, facilitating the adjustment of the tab tearing and retraction positions. Furthermore, its manufacturing method is simple and low-cost. Specifically, the manufacturing method of the adjustment battery cell in this application includes the following steps:

[0043] Step S1: Provide a spacer 110, and stack the spacer 110 together with their edges flush to obtain a stack; wherein, the thickness H of the spacer 110 is equal to the spacing thickness between adjacent foils of the cell to be regulated.

[0044] Step S2: Insert foil 120 between each layer of spacer film 110 of the stack to form a test cell 100; wherein each foil 120 extends toward the long side of the stack and the extended portion forms a test tab 130.

[0045] The spacer 110 is a thin film of a certain thickness. Its shape and size are the same as the main body 200 of the battery cell, forming a rectangle with a long side and a short side. The foil 120 is the material for the battery cell tabs. Common positive electrode foils are copper foils, with multiple layers stacked to form the positive electrode tab; common negative electrode foils are aluminum foils, with multiple layers stacked to form the negative electrode tab. In this embodiment, multiple spacers 110 are stacked flush to form a stack. The foil 120 is inserted into the gap between each spacer 110, inserted from either the short or long side of the spacer 110. The foil 120 is not completely inserted into the gap, but a portion remains outside the stack to form the adjustment tab 130. The thickness of the spacer 110 between the foils 120 is consistent with the actual battery cell structure.

[0046] This application provides a method for manufacturing a test cell. The method involves stacking spacer films 110 flat, inserting foil 120 between each layer of spacer films 110, and extending the foil 120 along the long side of the spacer film 110 to form a test tab 130. This creates a test cell 100 for testing the tabs. The test tab 130 formed by the foil 120 of the test cell 100 is identical to the tab structure of a real cell. When the test tab 130 of the test cell 100 is squeezed, due to the spacing thickness H of the spacer films 110, the test tab 130 will bend and shrink. This simulates the shrinkage position and tab tearing problem of a real cell during the testing process. The manufacturing method is simple, easy to produce, and has low production costs.

[0047] This application discloses a method for manufacturing a test cell. The test cell manufactured by this method uses a spacer film of a specific thickness to replace the thickness material between adjacent foils, simulating the specific structure of a real cell. This facilitates the adjustment of the position of the tab tear and retraction. Moreover, the manufacturing method is simple and low-cost. After the foil is replaced after adjustment, it can be reused repeatedly. It has the advantages of convenient manufacturing, low cost, and good adjustment effect.

[0048] In one embodiment, such as Figure 2 and Figure 3 As shown, step S1 specifically includes:

[0049] Step S11: Provide a long strip spacer 111 and fold it continuously to form a multi-layer spacer 110; wherein, the long strip spacer 111 is stacked with its edges flush during folding so that the size of each folded surface is consistent, and the thickness of the long strip spacer 111 is H.

[0050] In this embodiment, by continuously folding a long strip-shaped spacer membrane 111, the method can quickly stack multiple layers of spacer membrane 110 without cutting, thus forming a multi-layer spacer membrane 110 quickly and conveniently.

[0051] Inserting foil 120 into the spacer 110 includes two methods. One method is to insert only one type of foil 120 into the gap of the spacer 110, so that both ends of the adjustment cell 100 are positive or negative adjustment tabs. The other method is to insert positive or negative foil at intervals in the gap of the spacer 110, so that both ends of the adjustment cell 100 are positive and negative adjustment tabs, respectively. The two methods are shown in the following two embodiments.

[0052] In one embodiment, such as Figure 3 and Figure 4 As shown, Figure 3 To debug the structural diagram of cell 100, Figure 4 This is a structural diagram of a real battery cell. The thickness H is the thickness H1 between two adjacent positive electrode foils 350 or two adjacent negative electrode foils 310 of the battery cell to be adjusted. The stacked components include two. Step S2 specifically includes:

[0053] Step S21: Insert a first foil 121 between each spacer film 110 of the first stack to form a positive electrode adjustment cell; wherein each first foil 121 extends toward the long side of the stack, and the extended portion forms a positive electrode adjustment tab 131;

[0054] Step S22: Insert a second foil 122 between each spacer film 110 of the second stack to form a negative electrode adjustment cell; wherein each second foil 122 extends toward the long side of the stack, and the extended portion forms a negative electrode adjustment tab 132.

[0055] In this embodiment, the thickness H of the spacer 110 is set to the thickness H1 between two adjacent positive electrode foils 350 or two adjacent negative electrode foils 310 of the cell to be adjusted. Then, a first foil 121 or a second foil 122 is inserted between the spacers 110 to form a positive electrode adjustment tab 131 or a negative electrode adjustment tab 132. Since a spacer 110 with the same thickness H1 as the cell to be adjusted is provided between the first foil 121 or the second foil 122, the positive electrode adjustment tab 131 or the negative electrode adjustment tab 132 has the same positive or negative electrode structure as the cell to be adjusted. It can be used to replace the positive or negative electrode of the adjustment cell to simulate the shrinking position and tab tearing problem.

[0056] Specifically, the formula for calculating the thickness H1 between two adjacent positive electrode foils 350 or two adjacent negative electrode foils 310 is H1 = (L2 + L3 + L4) × 2 + L1 or H1 = (L2 + L3 + L4) × 2 + L5, where L2 is the thickness of the negative electrode foil coating 320 of the cell to be adjusted, L3 is the thickness of the separator 330 of the cell to be adjusted, L4 is the thickness of the positive electrode foil coating 340 of the cell to be adjusted, L1 is the thickness of the negative electrode foil 310 of the cell to be adjusted, and L5 is the thickness of the positive electrode foil 350 of the cell to be adjusted. Figure 4 The display shows that, based on the actual structure of the battery cell under test, the thickness H1 between two adjacent positive electrode foils 350 or between two adjacent negative electrode foils 310 consists of the thickness L2 of two layers of negative electrode foil coating 320, the thickness L4 of two layers of positive electrode foil coating 340, the thickness L3 of two layers of separator, and the thickness L1 of one layer of negative electrode foil 310 or the thickness L5 of one layer of positive electrode foil 350. This can be expressed using the formula L2×2+L3×2+L4×2+L1 or H1=(L2+L3+L4)×2+L5. Figure 4 H1 in the figure represents the thickness between the two negative electrode foils 310.

[0057] In another embodiment, such as Figure 3 and Figure 4 As shown, the thickness H is the thickness H2 between two adjacent foils of the cell to be adjusted. Step S2 specifically includes:

[0058] Alternating insertion of first foil 121 and second foil 122 between each spacer film 110 of the stack forms a test cell 100; wherein each first foil 121 extends toward the first long side of the stack, and the extended portion forms a positive test tab 131; each second foil 122 extends toward the second long side of the stack, and the extended portion forms a negative test tab 132; wherein the direction of the second long side is opposite to the direction of the first long side.

[0059] By setting the thickness H of the spacer 110 to the thickness H2 between two adjacent foils of the cell to be adjusted, and then inserting the first foil 121 and the second foil 122 into the two long sides of the spacer 110 respectively, positive adjustment tab 131 and negative adjustment tab 132 extend out in the two long sides. Thus, the cell to be adjusted has both positive adjustment tab 131 and negative adjustment tab 132. When the positive and negative tabs need to be used at the same time, the cell to be adjusted can achieve a tab structure that is completely consistent with the real cell, simulating the adjustment results of the positive and negative tabs.

[0060] Specifically, the formula for calculating the thickness H2 between two adjacent foils is H2 = L2 + L3 + L4, where L2 is the thickness of the negative electrode foil coating of the cell to be adjusted (320mm), L3 is the thickness of the separator of the cell to be adjusted (330mm), and L4 is the thickness of the positive electrode foil coating of the cell to be adjusted (340mm). Figure 4 The display shows that, based on the actual structure of the battery cell under test, the thickness H2 between two adjacent foils consists of a negative electrode foil coated with a thickness of 320 L2, a positive electrode foil coated with a thickness of 340 L4, and a separator layer with a thickness of L3. It can be expressed by the formula L2+L3+L4.

[0061] In a preferred embodiment, the first foil 121 is aluminum foil; the second foil 122 is copper foil. The first foil 121 serves as the positive electrode material, preferably aluminum foil, a commonly used battery positive electrode material, and the second foil 122 serves as the negative electrode material, preferably copper foil, a commonly used battery negative electrode material. The aluminum foil and copper foil readily undergo oxidation-reduction reactions, which, when used as the positive and negative electrodes of the battery, enable the battery to have good performance.

[0062] In a preferred embodiment, the spacer 110 is a polyester film. The polyester film can be adjusted in thickness to H1 or H2 as needed, can be reused, and has the advantages of low cost and ease of production.

[0063] On the other hand, the method for adjusting the battery cell tabs described in the embodiments of this application includes the following steps:

[0064] Step S1: Provide a spacer 110, and stack the spacer 110 together with their edges flush to obtain a stack; wherein, the thickness H of the spacer 110 is equal to the spacing thickness between adjacent foils of the cell to be regulated;

[0065] Step S2: Insert foil 120 between each layer of spacer film 110 of the stack to form a test cell 100; wherein each foil 120 extends toward the long side of the stack, and the extended part forms a test tab 130.

[0066] Step S3: Perform ultrasonic welding on the adjustment tab 130.

[0067] In this application, steps S1 and S2 are the manufacturing method of the debugging battery cell corresponding to this application. The debugging method of the battery cell tab described in this application also includes other embodiments of the manufacturing method of the debugging battery cell of this application.

[0068] This method involves ultrasonically welding and debugging the tabs of a test cell manufactured using the test cell manufacturing method described in this embodiment. The test cell used during debugging has a tab structure that is completely consistent with that of a real cell. When the test tab 130 of the test cell 100 is squeezed, the test tab 130 will bend and shrink due to the spacing thickness H of the spacer film 110. During the debugging process, the shrinkage position and tab tearing problem of a real cell are simulated, resulting in a good debugging effect.

[0069] On the other hand, such as Figure 2 and Figure 3 As shown in the embodiment of this application, a test cell is provided, comprising multiple layers of spacer films 110 stacked with flush edges. The thickness H of the spacer film 110 is equal to the spacing thickness between adjacent foils of the cell to be tested. Foils 120 are inserted between each layer of spacer film 110, and each foil 120 extends toward the long side of the stack, with the extended portion forming a test tab 130.

[0070] Specifically, in the embodiment of this application, the spacer 110 of a test cell can be stacked in a manner where single-layer spacer 110s are stacked with their edges flush to form a stack, or a long strip spacer 111 can be continuously folded to form a stack of multiple spacer 110s. The foil 120 can be inserted in a manner where only one type of foil 120 is inserted into the gaps between the spacer 110s, so that both ends of the test cell 100 are either positive or negative test tabs; or positive foil 350 or negative foil 310 can be inserted intermittently into the gaps between the spacer 110s, so that both ends of the test cell 100 are positive and negative test tabs, respectively. This test cell is not only suitable for ultrasonic welding test of tabs, but also for test processes of other tab structures. The debugging cell forms a debugging tab 130 by directly inserting the spacer 110 into the foil 120. This can simulate the real structure of the tab and simulate the closing position and tearing problem of the real tab during debugging. The debugging effect is good, the production cost is low, and it is easy to produce. It can be widely used in debugging work.

[0071] Specifically, the length L of the spacer 110 is equal to the main body length of the cell to be adjusted; the width W of the spacer 110 is equal to the main body width of the cell to be adjusted. By setting the spacer 110 to the same length and width as the main body of the actual cell, the size of the actual cell is simulated, making the adjustment results more accurate.

[0072] The manufacturing method and the debugging cell described in this application have the following advantages:

[0073] 1. By stacking spacers flat, inserting foil between each layer of spacers, and extending the foil along the long side of the spacers to form adjustment tabs, a debugging cell is made to adjust the tabs. The adjustment tabs formed by the foil of this debugging cell are completely consistent with the tab structure of the real cell. When the adjustment tabs of this debugging cell are squeezed, due to the spacing thickness H of the spacers, the adjustment tabs will bend and shrink. During the adjustment process, the shrinkage position and tab tearing problem of the real cell are simulated. Moreover, the manufacturing method is simple, easy to produce, and has low production cost.

[0074] 2. By setting the separator membrane as a polyester membrane, the thickness of the polyester membrane can be adjusted during production as needed. It can be reused as the battery cell to be adjusted, and has the advantages of low cost and easy production.

[0075] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and the present invention also intends to include these modifications and variations.

Claims

1. A method for manufacturing a test battery cell, characterized in that, Includes the following steps: Step S1: Provide a spacer film (110), and stack the spacer films (110) together with their edges flush to obtain a stack; wherein, the thickness H of the spacer film (110) is equal to the spacing thickness between adjacent foils of the cell to be regulated; The thickness H is equal to the thickness H1 between two adjacent positive electrode foils or two adjacent negative electrode foils of the cell to be adjusted, or the thickness H is equal to the thickness H2 between two adjacent foils of the cell to be adjusted. The formula for calculating the thickness H1 is H1=(L2+L3+L4)×2+L1 or H1=(L2+L3+L4)×2+L5, where L2 is the thickness of the negative electrode foil coating of the cell to be adjusted, L3 is the thickness of the separator of the cell to be adjusted, L4 is the thickness of the positive electrode foil coating of the cell to be adjusted, L1 is the thickness of the negative electrode foil of the cell to be adjusted, and L5 is the thickness of the positive electrode foil of the cell to be adjusted. The formula for calculating thickness H2 is H2=L2+L3+L4, where L2 is the thickness of the negative electrode foil coating of the cell to be adjusted, L3 is the thickness of the separator of the cell to be adjusted, and L4 is the thickness of the positive electrode foil coating of the cell to be adjusted. Step S2: Insert foil (120) between each layer of spacer film (110) of the stack to form a test cell (100); wherein each foil (120) extends toward the long side of the stack and the extended portion forms a test tab (130).

2. The manufacturing method of a test cell according to claim 1, characterized in that, Step S1 specifically includes: Step S11: Provide a long strip spacer membrane (111) and fold it continuously to form multiple layers of the spacer membrane (110); wherein, the long strip spacer membrane (111) is stacked with its edges aligned during folding so that the size of each folded surface is consistent, and the thickness of the long strip spacer membrane (111) is H.

3. The manufacturing method of a test cell according to claim 1, characterized in that, When the thickness H is equal to the thickness H1 between two adjacent positive electrode foils or two adjacent negative electrode foils of the cell to be adjusted, the stacked components include two, and step S2 specifically includes: Step S21: Insert a first foil (121) between each of the spacer films (110) of one of the stacks to form a positive adjustment cell; wherein each of the first foils (121) extends toward the long side of the stack and the extended portion forms a positive adjustment tab (131). Step S22: Insert a second foil (122) between each of the spacer films (110) of another stack to form a negative electrode adjustment cell; wherein each of the second foils (122) extends toward the long side of the stack and the extended portion forms a negative electrode adjustment tab (132).

4. The manufacturing method of a test cell according to claim 1, characterized in that, When the thickness H is equal to the thickness H2 between two adjacent foils of the cell to be adjusted, step S2 specifically includes: Alternating insertion of first foil (121) and second foil (122) between the spacer films (110) of the stacked assembly forms a test cell (100); wherein each first foil (121) extends toward a first long side of the stacked assembly, and the extended portion forms a positive test tab (131); each second foil (122) extends toward a second long side of the stacked assembly, and the extended portion forms a negative test tab (132); wherein the second long side direction is opposite to the first long side direction.

5. A method for manufacturing a test cell according to claim 3 or 4, characterized in that: The first foil (121) is aluminum foil; the second foil (122) is copper foil.

6. A method for manufacturing a test cell according to any one of claims 1-4, characterized in that: The spacer membrane (110) is a polyester membrane.

7. A method for adjusting the electrode tabs of a battery cell, characterized in that, Includes the following steps: Step S1: Provide a spacer film (110), and stack the spacer films (110) together with their edges flush to obtain a stack; wherein, the thickness H of the spacer film (110) is equal to the spacing thickness between adjacent foils of the cell to be regulated; The thickness H is equal to the thickness H1 between two adjacent positive electrode foils or two adjacent negative electrode foils of the cell to be adjusted, or the thickness H is equal to the thickness H2 between two adjacent foils of the cell to be adjusted. The formula for calculating the thickness H1 is H1=(L2+L3+L4)×2+L1 or H1=(L2+L3+L4)×2+L5, where L2 is the thickness of the negative electrode foil coating of the cell to be adjusted, L3 is the thickness of the separator of the cell to be adjusted, L4 is the thickness of the positive electrode foil coating of the cell to be adjusted, L1 is the thickness of the negative electrode foil of the cell to be adjusted, and L5 is the thickness of the positive electrode foil of the cell to be adjusted. The formula for calculating thickness H2 is H2=L2+L3+L4, where L2 is the thickness of the negative electrode foil coating of the cell to be adjusted, L3 is the thickness of the separator of the cell to be adjusted, and L4 is the thickness of the positive electrode foil coating of the cell to be adjusted. Step S2: Insert foil (120) between each layer of spacer film (110) of the stack to form a test cell (100); wherein each foil (120) extends toward the long side of the stack and the extended portion forms a test tab (130). Step S3: Perform ultrasonic welding on the adjustment tab (130).

8. A type of test cell, characterized in that: A stack of spacer films (110) with flush edges is obtained, wherein the thickness H of the spacer film (110) is equal to the spacing thickness between adjacent foils of the cell to be regulated. A foil (120) is inserted between each of the spacer membranes (110), and each foil (120) extends toward the long side of the stack, with the extended portion forming a tuning tab (130). The thickness H is equal to the thickness H1 between two adjacent positive electrode foils or two adjacent negative electrode foils of the cell to be adjusted, or the thickness H is equal to the thickness H2 between two adjacent foils of the cell to be adjusted. The formula for calculating the thickness H1 is H1=(L2+L3+L4)×2+L1 or H1=(L2+L3+L4)×2+L5, where L2 is the thickness of the negative electrode foil coating of the cell to be adjusted, L3 is the thickness of the separator of the cell to be adjusted, L4 is the thickness of the positive electrode foil coating of the cell to be adjusted, L1 is the thickness of the negative electrode foil of the cell to be adjusted, and L5 is the thickness of the positive electrode foil of the cell to be adjusted. The formula for calculating the thickness H2 is H2=L2+L3+L4, where L2 is the thickness of the negative electrode foil coating of the cell to be adjusted, L3 is the thickness of the separator of the cell to be adjusted, and L4 is the thickness of the positive electrode foil coating of the cell to be adjusted.

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