Battery cell manufacturing method and lithium ion battery cell

Abstract

The invention provides a battery cell manufacturing method and a lithium ion battery cell, and relates to the technical field of battery cell manufacturing. Comprising the steps that a preset battery cell internal space design type is obtained, corresponding redundant size data are determined according to the preset battery cell internal space design type, and the redundant size data are space gap sizes in the battery cell internal space design type; determining a corresponding space utilization rate value according to the corresponding redundant size data; comparing the corresponding space utilization rate values to obtain a comparison result; and determining a space design type of the to-be-manufactured battery cell according to a comparison result, and assembling the battery cell according to the space design type of the to-be-manufactured battery cell to obtain the battery cell. Through the method, the space structure design of the battery cell is more reasonable, the space utilization rate of the battery cell with the same size can be improved, the manufacturing cost of the battery cell is reduced, and the market competitiveness of the battery cell is improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery cell manufacturing, and particularly to a method for manufacturing a battery cell and a lithium-ion battery cell. Background Art

[0002] With the rapid development of electric vehicles and energy storage technologies, as the core energy storage unit, the performance of lithium-ion battery cells directly determines the driving range of the whole vehicle and the efficiency of the energy storage system. As the basic energy storage unit of lithium-ion battery cells, the internal space structure design of battery cells has an important impact on energy density, cost, and the performance of the whole battery pack. However, currently, the size of battery cells is usually limited by the manufacturing capabilities and costs of structural component suppliers, resulting in low utilization rate of the internal space of battery cells, affecting the improvement of energy density, increasing the number and cost of battery cells, and at the same time increasing the volume and weight of the battery cell pack, reducing the energy efficiency and design flexibility of the whole vehicle.

[0003] Currently, the market has higher requirements for range anxiety and storage efficiency of the whole battery pack. Especially today with high driving range requirements, it is extremely urgent to improve the energy density of battery cells. Therefore, maximizing the space utilization of battery cells of the same size is of great significance. A reasonable space structure design can not only meet the requirement of higher energy density under the limited battery size, but also greatly reduce the cost of battery cells and enhance the market competitiveness of battery cells. Summary of the Invention

[0004] The present application provides a method for manufacturing a battery cell and a lithium-ion battery cell, which solves the problem that battery cells of different specifications and sizes may have different space utilization rates in different space design types, makes the space structure design of battery cells more reasonable, can improve the space utilization rate of battery cells of the same size, reduce the manufacturing cost of battery cells, and enhance the market competitiveness of battery cells.

[0005] In a first aspect, the present application provides a method for manufacturing a battery cell, including: obtaining a preset internal space design type of the battery cell, determining corresponding redundant dimension data according to the preset internal space design type of the battery cell, where the redundant dimension data is the space gap dimension in the internal space setting type of the battery cell; determining a corresponding space utilization rate value according to the corresponding redundant dimension data; comparing the corresponding space utilization rate values to obtain a comparison result; determining the space design type of the battery cell to be manufactured according to the comparison result, and assembling the battery cell according to the space design type of the battery cell to be manufactured to obtain the battery cell.

[0006] Through the above solution, the preset internal space design type of the battery cell refers to the pre-defined internal structure layout and space utilization plan of the battery cell during the manufacturing process of the battery cell. Corresponding to different preset internal space design types of the battery cell, the arrangement methods of the internal electrodes will be different. Therefore, the redundant dimension data corresponding to the inside of the battery cell are all different. Through the redundant dimension data, the space utilization rate value corresponding to the preset internal space design type of the battery cell can be obtained. The space utilization rate refers to the ratio of the volume actually used for storing energy inside the battery cell to the total volume of the battery cell. By comparing the space utilization rate values of different preset design types, the optimal type design scheme can be found, so as to achieve a higher energy density under the limited battery size. This method enables the reduction of the manufacturing cost of the battery cell and the improvement of the market competitiveness of the battery cell. Since the space utilization rates of battery cells with different specifications and sizes are different under different space design types, the optimal design scheme can be obtained by selecting the internal space design type with the highest space utilization rate, making the space structure design of the battery cell more reasonable, improving the space utilization rate of the battery cell under the same size, reducing the manufacturing cost of the battery cell, and enhancing the market competitiveness of the battery cell.

[0007] In a possible design, the preset internal space design type of the battery cell is determined according to the relative positions of the terminal post and the tab of the battery cell; the preset internal space design type of the battery cell at least includes a first design type when the terminal post and the tab of the battery cell are in a first relative position, a second design type when the terminal post and the tab of the battery cell are in a second relative position, a third design type when the terminal post and the tab of the battery cell are in a third relative position, a fourth design type when the terminal post and the tab of the battery cell are in a fourth relative position, and a fifth design type when the terminal post and the tab of the battery cell are in a fifth relative position. The corresponding redundant dimension data at least includes the redundant dimension data of the first design type, the redundant dimension data of the second design type, the redundant dimension data of the third design type, the redundant dimension data of the fourth design type, or the redundant dimension data of the fifth design type.

[0008] Through the above solution, in the design of the battery cell, the relative positions of the terminal post and the tab have a significant impact on the internal space utilization rate, energy density, and overall performance of the battery cell. By presetting different relative positions of the terminal post and the tab, multiple design types can be formed, and each type corresponds to different redundant dimension data and space utilization rates. For example: the first design type: the terminal post and the tab are located at a certain specific relative position, forming a specific internal space layout. The second design type, the third design type, the fourth design type, and the fifth design type are design types in the case where the positions of the terminal post and the tab are all different. By comparing the space utilization rates and redundant dimension data of different design types and selecting the optimal design scheme, a reasonable space structure design can be achieved at the lowest cost.

[0009] In a possible design, it further includes: obtaining the size data of the cell to be manufactured; the size data of the cell to be manufactured includes the sizes of the cell to be manufactured in the first direction, the second direction, and the third direction respectively, the size in the third direction is the arrangement direction of the internal winding cores of the cell to be manufactured, the first direction and the second direction are both perpendicular to the third direction, and the first direction is perpendicular to the second direction; the space gap size includes the space gap size in the first direction, the space gap size in the second direction, and / or the space gap size in the third direction.

[0010] Through the above solution, in cell design, by obtaining the size data of the cell to be manufactured (including the sizes in the first direction, the second direction, and the third direction) and combining with the space gap size (including the redundant sizes in the three directions), more precise optimization of the internal space of the cell can be achieved. Precise space gap design can reduce material waste and debugging costs during the manufacturing process. By optimizing the internal structure of the cell and reducing unnecessary space reservation, the material usage and production costs can be reduced.

[0011] In a possible design, the corresponding redundant dimension data includes: redundant dimension data of the first design type, redundant dimension data of the second design type, redundant dimension data of the third design type, redundant dimension data of the fourth design type, and redundant dimension data of the fifth design type; among them, the redundant dimension data of the first design type includes: the spatial gap dimension of the first design type in the first direction and the spatial gap dimension of the first design type in the second direction; the spatial gap dimension of the first design type in the first direction is 1 mm to 10 mm, and the spatial gap dimension of the first design type in the second direction is 2 mm to 15 mm; the redundant dimension data of the second design type includes: the spatial gap dimension of the second design type in the first direction and the spatial gap dimension of the second design type in the second direction; the spatial gap dimension of the second design type in the first direction is 3 mm to 20 mm; the spatial gap dimension of the second design type in the second direction is 1.5 mm to 12 mm; the redundant dimension data of the third design type includes: the spatial gap dimension of the third design type in the first direction and the spatial gap dimension of the third design type in the second direction; the spatial gap dimension of the third design type in the first direction is 4 mm to 40 mm; the spatial gap dimension of the third design type in the second direction is 1 mm to 10 mm; the redundant dimension data of the fourth design type includes: the spatial gap dimension of the fourth design type in the first direction and the spatial gap dimension of the fourth design type in the second direction; the spatial gap dimension of the fourth design type in the first direction is 2 mm to 15 mm; the spatial gap dimension of the fourth design type in the second direction is 1 mm to 10 mm; the redundant dimension data of the fifth design type includes: the spatial gap dimension of the fifth design type in the first direction and the spatial gap dimension of the fifth design type in the second direction; the spatial gap dimension of the fifth design type in the first direction is 1.5 mm to 12 mm; the spatial gap dimension of the fifth design type in the second direction is 2 mm to 15 mm.

[0012] Through the above solution, in the battery cell design, the redundant dimension data refers to the spatial gap dimensions in each direction inside the battery cell. These gap dimensions directly affect the space utilization rate of the battery cell, thereby affecting the energy density and the overall performance of the battery cell. For different preset internal space design types of the battery cell, the spatial gap dimensions in the first direction and the second direction are different. By precisely controlling the redundant dimension data, material waste and debugging costs during the production process can be reduced.

[0013] In a possible design, determining the corresponding space utilization rate value according to the corresponding redundant dimension data includes:

[0014]

[0015] Wherein, k is the space utilization rate value, L is the size of the battery cell to be fabricated in the first direction, H is the size of the battery cell to be fabricated in the second direction, N is the preset internal space design type of the battery cell, and l N is the space gap size in the first direction corresponding to the preset internal space design type of the battery cell, and h N is the space gap size in the second direction corresponding to the preset internal space design type of the battery cell.

[0016] Through the above solution, the effective space ratio actually used for energy storage can be accurately calculated by using the calculation method of the space utilization rate value k. By calculating the space utilization rate values k of different design types, it is possible to intuitively compare which design type can achieve a higher space utilization rate under given dimensions. This helps to select the optimal design and the most suitable design type. A higher space utilization rate means that more energy can be stored under the same battery cell size, thereby reducing the required number of battery cells and the amount of materials used. This directly reduces the manufacturing cost and improves the cost performance of the product.

[0017] In a possible design, after obtaining the comparison result by comparing the corresponding space utilization rate values, the method further includes the step of: using the space design type corresponding to the maximum space utilization rate in the comparison result as the space design type of the battery cell to be fabricated.

[0018] Through the above solution, the maximum space utilization rate means that more active materials can be accommodated under the same battery cell size, thereby significantly improving the energy density of the battery cell. Selecting the optimal space design type can ensure that the battery cells are arranged more compactly in the battery pack, thereby improving the overall performance of the battery pack.

[0019] In a possible design, determining the corresponding space utilization rate value according to the corresponding redundant size data includes: obtaining a redundancy value and determining the space utilization rate value according to the redundancy value.

[0020] The redundancy value is:

[0021] l N ×h N

[0022] Wherein, N is the preset internal space design type of the battery cell, and l N is the space gap size in the first direction corresponding to the preset internal space design type of the battery cell, and h N is the space gap size in the second direction corresponding to the preset internal space design type of the battery cell.

[0023] Through the above solution, by calculating the redundancy value, the space utilization rate of each design type can be accurately evaluated. It is more accurate to determine the redundancy value as the product of the space gap size in the first direction corresponding to the preset internal space design type of the battery cell and the space gap size in the second direction corresponding to the preset internal space design type of the battery cell, which helps to identify which design types are more efficient in space utilization.

[0024] In a possible design, after comparing the corresponding space utilization rate values and obtaining the comparison result, the method further includes the steps of: determining the space design type corresponding to the minimum redundancy value in the comparison result as the space design type corresponding to the maximum space utilization rate, and using the space design type corresponding to the maximum space utilization rate as the space design type of the battery cell to be manufactured.

[0025] Through the above solution, "the minimum redundancy value" actually means that the space not effectively utilized inside the battery cell is the smallest, that is, the space utilization rate is the highest. For each preset internal space design type of the battery cell, calculate the sum of the space gap sizes in the first direction and the second direction to obtain the redundancy value of this design type. Compare the redundancy values of all design types and find the minimum value among them. Determine the design type with the minimum redundancy value (i.e., the maximum space utilization rate) as the space design type of the battery cell to be manufactured. Use the determined optimal design type to manufacture the battery cell. This method can ensure that the battery cell design achieves the best in space utilization. This can not only improve the performance and safety of the battery cell, but also reduce costs and environmental impacts. It is an efficient and environmentally friendly battery cell design method.

[0026] In a possible design, the dimensions of the preset internal space design type of the battery cell in the third direction are equal.

[0027] Through the above solution, a battery cell of the same size means that the dimensions of the battery cell in all directions are unified, that is, in the arrangement direction of the winding core inside the battery cell (usually referring to the height or thickness direction of the battery cell), the dimensions of different design types are the same. Moreover, the standardized battery cell size helps to reduce inventory costs.

[0028] In a second aspect, the present application provides a lithium-ion battery cell, including the lithium-ion battery cell obtained by using any of the above battery cell manufacturing methods.

[0029] For the lithium-ion battery cell provided in the above second aspect and each possible design of the above second aspect, the beneficial effects can refer to the beneficial effects brought by the above first aspect and each possible implementation manner of the first aspect, and will not be elaborated here.

[0030] The above description is only an overview of the technical solution of the embodiment of the present application. In order to understand the technical means of the embodiment of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and understandable, the specific implementation manners of the present application are specifically given below. Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 Flowchart of the method for manufacturing an electric cell provided in an embodiment of the present application.

[0033] Figure 2 Schematic diagram of an electric cell of the first design type provided in an embodiment of the present application.

[0034] Figure 3 For Figure 2 Schematic diagram of the cross-sectional structure of the provided electric cell.

[0035] Figure 4 Schematic diagram of an electric cell of the second design type provided in an embodiment of the present application.

[0036] Figure 5 For Figure 4 Schematic diagram of the cross-sectional structure of the provided electric cell.

[0037] Figure 6 Schematic diagram of an electric cell of the third design type provided in an embodiment of the present application.

[0038] Figure 7 For Figure 6 Schematic diagram of the cross-sectional structure of the provided electric cell.

[0039] Figure 8 Schematic diagram of an electric cell of the fourth design type provided in an embodiment of the present application.

[0040] Figure 9 For Figure 8 Schematic diagram of the cross-sectional structure of the provided electric cell.

[0041] Figure 10 Schematic diagram of an electric cell of the fifth design type provided in an embodiment of the present application.

[0042] Figure 11 For Figure 10 Schematic diagram of the cross-sectional structure of the provided electric cell.

[0043] Description of the reference numerals:

[0044] 101, First housing; 102, First positive electrode terminal; 103, First negative electrode terminal; 104, First spatial gap; 201, Second housing; 202, Second positive electrode terminal; 203, Second negative electrode terminal; 204, Second electrode terminal side; 205, Second positive electrode tab side; 206, Second negative electrode tab side; 301, Third housing; 302, Third positive electrode terminal; 303, Third negative electrode terminal; 304, Third positive electrode tab side; 305, Third negative electrode tab side; 401, Fourth housing; 402, Fourth positive electrode terminal; 403, Fourth negative electrode terminal; 404, Fourth spatial gap; 501, Fifth housing; 502, Fifth positive electrode terminal; 503, Fifth negative electrode terminal; 504, Fifth positive electrode terminal side; 505, Fifth negative electrode terminal side; 506, Fifth electrode tab side; 601, Sixth housing; 602, Sixth positive electrode terminal; 603, Sixth negative electrode terminal; 604, Sixth winding core; 605, Sixth positive electrode tab; 606, Sixth positive connection point; 607, Sixth negative electrode tab; 608, Sixth negative connection point; 609, Sixth lower plastic; 701, Seventh housing; 702, Seventh positive electrode terminal; 703, Seventh negative electrode terminal; 704, Seventh winding core; 705, Seventh positive electrode tab; 706, Seventh positive connection point; 707, Seventh negative electrode tab; 708, Seventh negative connection point; 709, Seventh lower plastic; 801, Eighth housing; 802, Eighth positive electrode terminal; 803, Eighth negative electrode terminal; 804, Eighth winding core; 805, Eighth positive electrode tab; 806, Eighth positive connection point; 807, Eighth negative electrode tab; 808, Eighth negative connection point; 809, Eighth positive lower plastic; 802, Eighth positive electrode terminal; 810, Eighth negative lower plastic; 803, Eighth negative electrode terminal; 901, Ninth housing; 902, Ninth positive electrode terminal; 903, Ninth negative electrode terminal; 904, Ninth winding core; 905, Ninth positive electrode tab; 906, Ninth positive connection point; 907, Ninth negative electrode tab; 908, Ninth negative connection point; 909, Ninth lower plastic; 1001, Tenth housing; 1002, Tenth positive electrode terminal; 1003, Tenth negative electrode terminal; 1004, Tenth winding core; 1005, Tenth positive electrode tab; 1006, Tenth positive connection point; 1007, Tenth negative electrode tab; 1008, Tenth negative connection point; 1009, Tenth positive lower plastic; 1010, Tenth negative lower plastic. Detailed implementation manners

[0045] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0047] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase "embodiment" appearing at various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0048] The term "and / or" herein is merely a description of the associated relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can represent: the existence of A, the simultaneous existence of A and B, and the existence of B. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0049] The directional terms appearing in the following description are all the directions shown in the figures and do not limit the specific structure of this application. For example, in the description of this application, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "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 drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of this application.

[0050] In addition, the terms "first", "second", etc. in the specification, claims or the above-mentioned drawings of this application are used to distinguish different objects and are not used to describe a specific order, and may explicitly or implicitly include one or more of such features.

[0051] In the description of this application, unless otherwise specified, the meaning of "a plurality of" refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups).

[0052] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, the "connection" or "coupling" of mechanical structures can refer to a physical connection. For example, a physical connection can be a fixed connection, such as a fixed connection through a spacer, such as a fixed connection through screws, bolts, or other spacers; a physical connection can also be a detachable connection, such as a snap connection or a snap-fit connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0053] As can be seen from the background art, it is of great significance to maximize the space utilization of the battery cells of the same size.

[0054] After analysis, although the prior art constantly seeks energy density, it is basically based on the manufacturing capabilities of suppliers, and tries to increase the energy density as much as possible by increasing the number of battery cells, etc., without considering the problem that the space utilization rates of battery cells of different specifications and sizes may be different in different space design types.

[0055] In view of this, the embodiments of the present application provide a method for manufacturing a battery cell and a lithium-ion battery cell. Starting from the perspective that for battery cells of different specifications and sizes, a certain type of space design with the highest space utilization rate may be selected. Through redundant dimension data, the corresponding space utilization rate value of the preset internal space design type of the battery cell can be obtained. The space utilization rate refers to the ratio of the volume actually used for storing energy inside the battery cell to the total volume of the battery cell. By comparing the space utilization rate values of different preset design types, the optimal type design scheme can be found, so as to achieve higher energy density and better performance under the limited battery size. This makes the space structure design of the battery cell more reasonable, improves the space utilization rate of the battery cells of the same size, reduces the manufacturing cost of the battery cells, and enhances the market competitiveness of the battery cells.

[0056] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0057] Figure 1 The flowchart of the method for manufacturing a battery cell provided by an embodiment of the present application. Please refer to Figure 1 , the present application provides a method for manufacturing a battery cell, including:

[0058] Step 1, obtaining a preset internal space design type of the battery cell, and determining corresponding redundant dimension data according to the preset internal space design type of the battery cell. The redundant dimension data is the space gap dimension in the internal space setting type of the battery cell.

[0059] The space gap size in the internal space setting type of the battery cell includes the thicknesses of other mechanical structures inside the battery cell except for the electrode plates, such as the thicknesses of necessary mechanical components like the top cover, lower plastic, and bracket.

[0060] The preset internal space design type of the battery cell refers to the internal structure layout or space utilization plan preset before the manufacture of the battery cell.

[0061] In the design of the battery cell, the relative positions of the terminal post and the tab have a significant impact on the internal space utilization rate, energy density, and overall performance of the battery cell. By presetting different relative positions of the terminal post and the tab, multiple design types can be formed, and each type corresponds to different redundant size data and space utilization rates. The preset internal space design type of the battery cell is determined according to the relative positions of the terminal post and the tab of the battery cell; the preset internal space design type of the battery cell at least includes a first design type when the terminal post and the tab of the battery cell are in a first relative position, a second design type when the terminal post and the tab of the battery cell are in a second relative position, a third design type when the terminal post and the tab of the battery cell are in a third relative position, a fourth design type when the terminal post and the tab of the battery cell are in a fourth relative position, and a fifth design type when the terminal post and the tab of the battery cell are in a fifth relative position.

[0062] The first design type in this embodiment refers to the situation where the terminal post and the tab are on the same side in the height direction of the battery cell. Figure 2 Schematic diagram of the battery cell of the first design type provided in this embodiment. Please refer to Figure 2 , the first design type can also be called a U-shaped structure. In the first housing 101 of a specific size, the first positive terminal post 102 and the first negative terminal post 103 are on the same side in the width direction, and the direction of the tab is the same as the direction of the terminal post. At this time, the first space gap 104 inside the battery cell is on the tab side (which can also be called the terminal post side) of the battery cell.

[0063] The second design type in this embodiment refers to the situation where the terminal post is on the same side and the tabs are at both ends. Figure 4 Schematic diagram of the battery cell of the second design type provided in this embodiment. Please refer to Figure 4 , the second design type can also be called a C-shaped structure. In the second housing 201 of a specific size, the second positive terminal post 202 and the second negative terminal post 203 are on the same side, and the direction of the tab is perpendicular to the direction of the terminal post. At this time, the space gaps inside the battery cell are mainly in three directions: the second terminal post side 204, the second positive tab side 205, and the second negative tab side 206.

[0064] It can be understood that an L-shaped adapter plate usually needs to be added inside the second design type.

[0065] The third design type in this embodiment refers to the situation where the tabs are at both ends and the terminal posts are at both ends. Figure 6Schematic diagram of the battery cell of the third design type provided in this embodiment. Please refer to Figure 6 , the third design type can also be called the H-type structure. In the third housing 301 of a specific size, the third positive electrode post 302 and the positive electrode tab are on the same side, while the third negative electrode post 303 and the negative electrode tab are on the other side. At this time, the internal space gaps of the battery cell are respectively located on the third positive electrode tab side 304 and the third negative electrode tab side 305.

[0066] The fourth design type in this embodiment refers to the case where the electrode posts and the electrode tabs are on the same side in the width direction of the battery cell. Figure 8 Schematic diagram of the battery cell of the fourth design type provided in this embodiment. Please refer to Figure 8 , the fourth design type can also be called the C-type structure. In the fourth housing 401 of a specific size, the fourth positive electrode post 402 and the fourth negative electrode post 403 are on the same side in the height direction, and the direction of the electrode tab is the same as the direction of the electrode post. At this time, the fourth internal space gap 404 of the battery cell is located on the electrode tab side (which can also be called the electrode post side) of the battery cell.

[0067] The fifth design type in this embodiment refers to the case where the electrode tabs are designed on the same side and the electrode posts are designed at both ends. The fifth design type can also be called the H-A type structure. As Figure 10 shown, in the fifth housing 501 of a specific size, the fifth positive electrode post 502 and the fifth negative electrode post 503 are respectively on both sides in the width direction, while the positive electrode tab and the negative electrode tab are on the same side in the width direction of the battery cell. At this time, the internal space gaps of the battery cell are mainly located in three directions: the fifth positive electrode post side 504, the fifth negative electrode post side 505, and the fifth electrode tab side 506.

[0068] In the case of the same internal space of the battery cell, by respectively adopting the internal structure designs of the above preset internal space design types of the battery cell, the space utilization results are different. And for battery cells of different specifications and sizes, one of the space design types may be selected, and its space utilization is the highest.

[0069] Step 2, determine the corresponding space utilization value according to the corresponding redundant dimension data.

[0070] The corresponding redundant dimension data at least includes the redundant dimension data of the first design type, the redundant dimension data of the second design type, the redundant dimension data of the third design type, the redundant dimension data of the fourth design type, or the redundant dimension data of the fifth design type.

[0071] For different preset internal cell space design types, the arrangement of internal electrodes will be different. Therefore, the redundant dimension data corresponding to the inside of the cell are all different. Through the redundant dimension data, the space utilization rate value of the corresponding preset internal cell space design type can be obtained. The space utilization rate refers to the ratio of the volume actually used for storing energy inside the cell to the total volume of the cell.

[0072] In this embodiment, before determining the corresponding space utilization rate value according to the corresponding redundant dimension data, the steps may further include: obtaining the size data of the cell to be fabricated; the size data of the cell to be fabricated includes the sizes of the cell to be fabricated in the first direction, the second direction, and the third direction respectively. The size in the third direction is the arrangement direction of the internal winding core of the cell to be fabricated. The first direction and the second direction are both perpendicular to the third direction, and the first direction and the second direction are perpendicular to each other. The space gap size includes the space gap size in the first direction, the space gap size in the second direction, and / or the space gap size in the third direction.

[0073] Through the above solution, in cell design, by obtaining the size data of the cell to be fabricated (including the sizes in the first direction, the second direction, and the third direction), and combining with the space gap size (including the redundant dimensions in the three directions), more precise optimization of the internal cell space can be achieved. Precise space gap design can reduce material waste and debugging costs during the manufacturing process. By optimizing the internal cell structure and reducing unnecessary space reservation, the material usage and production costs can be reduced.

[0074] In this embodiment, the sizes of the preset internal cell space design types in the third direction are equal.

[0075] Through the above solution, cells of the same size mean that the sizes of the cells in each direction are unified, that is, in the arrangement direction of the internal winding core of the cell (usually referring to the height or thickness direction of the cell), the sizes of different design types are the same.

[0076] In this embodiment, the corresponding redundant dimension data includes: redundant dimension data of the first design type, redundant dimension data of the second design type, redundant dimension data of the third design type, redundant dimension data of the fourth design type, and redundant dimension data of the fifth design type; among them, the redundant dimension data of the first design type includes: the spatial gap dimension of the first design type in the first direction and the spatial gap dimension of the first design type in the second direction; the spatial gap dimension of the first design type in the first direction is 1 mm to 10 mm, and the spatial gap dimension of the first design type in the second direction is 2 mm to 15 mm; the redundant dimension data of the second design type includes: the spatial gap dimension of the second design type in the first direction and the spatial gap dimension of the second design type in the second direction; the spatial gap dimension of the second design type in the first direction is 3 mm to 20 mm; the spatial gap dimension of the second design type in the second direction is 1.5 mm to 12 mm; the redundant dimension data of the third design type includes: the spatial gap dimension of the third design type in the first direction and the spatial gap dimension of the third design type in the second direction; the spatial gap dimension of the third design type in the first direction is 4 mm to 40 mm; the spatial gap dimension of the third design type in the second direction is 1 mm to 10 mm; the redundant dimension data of the fourth design type includes: the spatial gap dimension of the fourth design type in the first direction and the spatial gap dimension of the fourth design type in the second direction; the spatial gap dimension of the fourth design type in the first direction is 2 mm to 15 mm; the spatial gap dimension of the fourth design type in the second direction is 1 mm to 10 mm; the redundant dimension data of the fifth design type includes: the spatial gap dimension of the fifth design type in the first direction and the spatial gap dimension of the fifth design type in the second direction; the spatial gap dimension of the fifth design type in the first direction is 1.5 mm to 12 mm; the spatial gap dimension of the fifth design type in the second direction is 2 mm to 15 mm.

[0077] Through the above solution, in the battery cell design, the redundant dimension data refers to the spatial gap dimensions in each direction inside the battery cell. These gap dimensions directly affect the space utilization rate of the battery cell, thereby affecting the energy density and the overall performance of the battery cell. For different preset internal space design types of the battery cell, the spatial gap dimensions in the first direction and the second direction are different. By precisely controlling the redundant dimension data, material waste and debugging costs during the production process can be reduced.

[0078] In this embodiment, determining the corresponding space utilization rate value according to the corresponding redundant dimension data includes:

[0079]

[0080] Among them, k is the space utilization rate value, L is the size of the battery cell to be manufactured in the first direction, H is the size of the battery cell to be manufactured in the second direction, N is the preset internal space design type of the battery cell, l N is the space gap size in the first direction corresponding to the preset internal space design type of the battery cell, h N is the space gap size in the second direction corresponding to the preset internal space design type of the battery cell.

[0081] Figure 3 is Figure 2 a schematic cross-sectional structure diagram of the provided battery cell. As Figure 3 shown, in the first design type, in the specific sixth housing 601, the sixth positive electrode post 602 and the sixth negative electrode post 603 are arranged on the same side in the width direction, and current passes in the positive electrode direction at the sixth positive connection 606 of the sixth positive electrode tab 605 of the sixth wound core 604, and current passes in the negative electrode direction at the sixth negative connection 608 of the sixth negative electrode tab 607 of the sixth wound core 604. The sixth lower plastic 609 is located on the side of the electrode post, and the space gap here is relatively large. When the size of the battery in the third direction W of the battery cell is fixed, if the space gap size of the battery of the first design type in the internal first direction is l U , and the space gap size in the internal second direction is h U , then the calculation formula for the space utilization rate k of the first design type is:

[0082]

[0083] Figure 5 is Figure 4 a schematic cross-sectional structure diagram of the provided battery cell. As Figure 5 shown, in the second design type, in the specific seventh housing 701, the seventh positive electrode post 702 and the seventh negative electrode post 703 come out on the same side, and current passes in the positive electrode direction at the seventh positive connection 706 of the seventh positive electrode tab 705 of the seventh wound core 704, and current passes in the negative electrode direction at the seventh negative connection 708 of the seventh negative electrode tab 707 of the seventh wound core 704. The seventh lower plastic 709 is located on the side of the electrode post, and the space and the distance from both ends of the electrode tab side are larger here. When the size of the battery in the third direction W of the battery cell is fixed, if the space gap size of the battery of the second design type in the internal first direction is l A , and the space gap size in the internal second direction is h A , then the calculation formula for the space utilization rate k at this time is:

[0084]

[0085] Figure 7 is Figure 6 a schematic cross-sectional structure diagram of the provided battery cell. As Figure 7As shown, in the third design type, in a specific eighth housing 801, an eighth positive electrode post 802 and an eighth negative electrode post 803 protrude from opposite sides, with overcurrent flowing in the positive electrode direction at the eighth positive connection 806 of the eighth positive electrode tab 805 of the eighth core 804, and overcurrent flowing in the negative electrode direction at the eighth negative connection 808 of the eighth negative electrode tab 807 of the eighth core 804. An eighth positive lower plastic 809 is located on the side where the eighth positive electrode post 802 is located, and an eighth negative lower plastic 810 is located on the side where the eighth negative electrode post 803 is located. The space gaps at these two locations are relatively large. When the dimension in the third direction W of the battery cell is fixed, if the space gap dimension l of the battery of the third design type in the internal first direction H is h in the internal second direction H , then the calculation formula for the space utilization rate k at this time is:

[0086]

[0087] Figure 9 is Figure 8 the schematic cross-sectional structure diagram of the battery cell provided. As Figure 9 shown, in the fourth design type, in a specific ninth housing 901, a ninth positive electrode post 902 and a ninth negative electrode post 903 protrude from the same side along the height direction, with overcurrent flowing in the positive electrode direction at the ninth positive connection 906 of the ninth positive electrode tab 905 of the ninth core 904, and overcurrent flowing in the negative electrode direction at the ninth negative connection 908 of the ninth negative electrode tab 907 of the ninth core 904. A ninth lower plastic 909 is located on the side of the electrode post (also known as the tab side). The space gap here is even larger. When the dimension in the third direction W of the battery cell is fixed, if the space gap dimension of the battery of the fourth design type in the internal first direction is l C and is h in the internal second direction C , then the calculation formula for the space utilization rate k at this time is:

[0088]

[0089] Figure 11 is Figure 10 the schematic cross-sectional structure diagram of the battery cell provided. As Figure 11 shown, in the H-A type structure, in a specific tenth housing 1001, a tenth positive electrode post 1002 and a tenth negative electrode post 1003 protrude from opposite sides, with overcurrent flowing in the positive electrode direction at the tenth positive connection 1006 of the tenth positive electrode tab 1005 of the tenth core 1004, and overcurrent flowing in the negative electrode direction at the tenth negative connection 1008 of the tenth negative electrode tab 1007 of the tenth core 1004. A tenth positive lower plastic 1009 is located on the side of the positive electrode post, and a tenth negative lower plastic 1010 is located on the side of the negative electrode post. The space gaps at these two locations are even larger. When the dimension in the third direction W of the battery cell is fixed, if the space gap dimension of the battery of the fifth design type in the internal first direction is lHA The size of the space gap in the internal second direction is h HA At this time, the calculation formula for the space utilization rate k is as follows:

[0090]

[0091] Through the above solution, the calculation method of the space utilization rate value k can accurately calculate the effective space ratio actually used for energy storage. By calculating the space utilization rate values k of different design types, it is possible to intuitively compare which design type can achieve a higher space utilization rate under a given size. The above calculation method of the space utilization rate for different types of structural designs is used to select the most reasonable structural design under a specific battery size, maximize the utilization of the internal space of the battery, reduce costs, and enhance the market competitiveness of the battery.

[0092] Step 3: Compare the corresponding space utilization rate values to obtain a comparison result.

[0093] In this embodiment, after comparing the corresponding space utilization rate values to obtain a comparison result, the following steps are further included: taking the space design type corresponding to the maximum space utilization rate in the comparison result as the space design type of the cell to be manufactured.

[0094] Through the above solution, the maximum space utilization rate means that more active materials can be accommodated under the same cell size, thus significantly improving the energy density of the cell. Selecting the optimal space design type can ensure that the arrangement of the cells in the battery pack is more compact, thereby improving the overall performance of the battery pack.

[0095] Step 4: Determine the space design type of the cell to be manufactured according to the comparison result, and assemble the cell according to the space design type of the cell to be manufactured to obtain the cell.

[0096] By comparing the space utilization rate values of different preset design types, the optimal type design scheme can be found, so as to achieve higher energy density and better performance under the limited battery size. This method helps to reduce the manufacturing cost of the cell and enhance the market competitiveness of the cell.

[0097] In some embodiments, the dimension of the battery cell in the third direction is the thickness of the battery cell, the dimension of the battery cell in the first direction is the width of the battery cell, and the dimension of the battery cell in the second direction is the height of the battery cell. As shown in Table 1, when the thickness dimension of the battery cell is fixed, the width L of the battery cell is 300 mm, and the height H (including the terminal post) of the battery cell is 116 mm. At the same time, when the winding core dimension of the battery cell is fixed: According to the U-shaped structure design scheme, the redundant dimension l in the width direction is 2 mm, and the redundant dimension in the height direction is 6.2 mm; According to the A-shaped structure design scheme, the redundant dimension l in the width direction is 10 mm, and the redundant dimension in the height direction is 5.2 mm; According to the H-shaped structure design scheme, the redundant dimension l in the width direction is 16 mm, and the redundant dimension in the height direction is 1.6 mm; According to the C-shaped structure design scheme, the redundant dimension l in the width direction is 6.2 mm, and the redundant dimension in the height direction is 2 mm; According to the H-A-shaped structure design scheme, the redundant dimension l in the width direction is 16 mm, and the redundant dimension in the height direction is 1.6 mm; Then the effective space utilization rates of the battery cells are C-type 96.2% > U-type 94.0% > H-type 93.4% > H-A-type 93.0% > A-type 92.3%, that is, the best internal structure design scheme of the battery cell at this time is the C-type.

[0098] Table 1:

[0099]

[0100] In some embodiments, as shown in Table 2, when the thickness dimension of the battery cell is fixed, assuming the width L of the battery cell is 600 mm and the height H (including the terminal post) of the battery cell is 116 mm. At the same time, when the winding core dimension of the battery cell is fixed: According to the U-shaped structure design scheme, the redundant dimension l in the width direction is 2 mm, and the redundant dimension in the height direction is 6.2 mm; According to the A-shaped structure design scheme, the redundant dimension l in the width direction is 10 mm, and the redundant dimension in the height direction is 5.2 mm; According to the H-shaped structure design scheme, the redundant dimension l in the width direction is 16 mm, and the redundant dimension in the height direction is 1.6 mm; According to the C-shaped structure design scheme, the redundant dimension l in the width direction is 6.2 mm, and the redundant dimension in the height direction is 2 mm; According to the H-A-shaped structure design scheme, the redundant dimension l in the width direction is 16 mm, and the redundant dimension in the height direction is 2 mm; Then the effective space utilization rates of the battery cells are U-type 97.3% > H-type 96.0% > H-A-type 95.7% > U-type 94.3% > A-type 93.9%, that is, the best internal structure design scheme of the battery cell at this time is the C-type. All the above thicknesses include the thickness of the battery cell housing. All the above thicknesses include the thickness of the battery cell housing.

[0101] Table 2:

[0102]

[0103] In some embodiments, as shown in Table 3, when the thickness dimension of the battery cell is fixed, assuming that the width L of the battery cell is 148 mm and the height H (including the terminal post) of the battery cell is 204 mm, and when the winding core size of the battery cell is fixed: According to the U-shaped structure design scheme, it can be calculated that the redundant dimension l in the width direction is 2 mm, and the redundant dimension in the height direction is 6.2 mm; According to the A-shaped structure design scheme, it can be calculated that the redundant dimension l in the width direction is 10 mm, and the redundant dimension in the height direction is 5.2 mm; According to the H-shaped structure design scheme, it can be calculated that the redundant dimension l in the width direction is 16 mm, and the redundant dimension in the height direction is 1.6 mm; According to the C-shaped structure design scheme, it can be calculated that the redundant dimension l in the width direction is 6.2 mm, and the redundant dimension in the height direction is 2 mm; According to the H-shaped structure design scheme, it can be calculated that the redundant dimension l in the width direction is 16 mm, and the redundant dimension in the height direction is 2 mm; Then the effective space utilization rates of the battery cell are U-shaped 95.7% > C-shaped 94.9% > A-shaped 90.9% > H-shaped 88.5% > H-A-shaped 88.3%, that is, the best battery cell internal structure design scheme at this time is U-shaped. All the above thicknesses include the thickness of the battery cell housing. All the above thicknesses include the thickness of the battery cell housing.

[0104] Table 3:

[0105]

[0106] As can be seen from Table 1, Table 2 and Table 3, for battery cells of different sizes, the internal space design types are different, and their space utilization rates are different. Therefore, through the above battery cell manufacturing method, a scheme with the optimal space utilization rate can be obtained.

[0107] In a possible design, the corresponding space utilization rate value can be determined according to the corresponding redundant dimension data, and the space utilization rate value can be determined by obtaining the redundant value and according to the redundant value.

[0108] The redundant value can be obtained through the following formula.

[0109] l N ×h N

[0110] Where N is the preset internal space design type of the battery cell, l N is the space gap dimension in the first direction corresponding to the preset internal space design type of the battery cell, and h N is the space gap dimension in the second direction corresponding to the preset internal space design type of the battery cell.

[0111] Through the above solution, by calculating the redundancy value, the space utilization rate of each design type can be accurately evaluated. It is more accurate to determine the redundancy value as the product of the space gap size in the first direction corresponding to the preset internal space design type of the battery cell and the space gap size in the second direction corresponding to the preset internal space design type of the battery cell, which helps to identify which design types are more efficient in space utilization.

[0112] In a possible design, after comparing the corresponding space utilization rate values and obtaining the comparison result, the following steps are further included: determining the space design type corresponding to the minimum redundancy value in the comparison result as the space design type corresponding to the maximum space utilization rate, and using the space design type corresponding to the maximum space utilization rate as the space design type of the battery cell to be manufactured.

[0113] Through the above solution, "the minimum redundancy value" here actually means that the space inside the battery cell that is not effectively utilized is the smallest, that is, the space utilization rate is the highest. For each preset internal space design type of the battery cell, calculate the sum of the space gap sizes in the first direction and the second direction to obtain the redundancy value of this design type. Compare the redundancy values of all design types and find the minimum value among them. Determine the design type with the minimum redundancy value (i.e., the maximum space utilization rate) as the space design type of the battery cell to be manufactured. Use the determined optimal design type to manufacture the battery cell. This method can ensure that the battery cell design reaches the optimal in space utilization. This can not only improve the performance and safety of the battery cell, but also reduce costs and environmental impacts. It is an efficient and environmentally friendly battery cell design method.

[0114] Based on the above embodiments, the present application further provides a lithium-ion battery cell, including the lithium-ion battery cell obtained by using any of the above battery cell manufacturing methods. Since the battery cell manufacturing method and the beneficial effects have been described in detail above, they will not be repeated here.

[0115] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for manufacturing a battery cell, characterized in that: include: Obtaining a preset battery cell internal space design type, and determining corresponding redundant dimension data according to the preset battery cell internal space design type, wherein the redundant dimension data is a space gap dimension in the battery cell internal space setting type; Determine a corresponding space utilization value according to the corresponding redundant size data; Compare the corresponding space utilization values ​​to obtain the comparison results; The space design type of the battery cell to be manufactured is determined according to the comparison result, and the battery cells are assembled according to the space design type of the battery cell to be manufactured to obtain the battery cell.

2. The method for manufacturing a battery cell according to claim 1, characterized in that: The preset battery cell internal space design type is determined according to the relative positions of the pole and the pole lug of the battery cell; The preset battery cell internal space design type includes at least a first design type when the battery cell's pole and lug are in a first relative position, a second design type when the battery cell's pole and lug are in a second relative position, a third design type when the battery cell's pole and lug are in a third relative position, a fourth design type when the battery cell's pole and lug are in a fourth relative position, and a fifth design type when the battery cell's pole and lug are in a fifth relative position, and the corresponding redundant dimension data includes at least redundant dimension data of the first design type, redundant dimension data of the second design type, redundant dimension data of the third design type, redundant dimension data of the fourth design type, or redundant dimension data of the fifth design type.

3. The method for manufacturing a battery cell according to claim 1 or 2, characterized in that: Also includes: Acquire size data of the battery cell to be manufactured; the size data of the battery cell to be manufactured includes the size of the battery cell to be manufactured in a first direction, a second direction and a third direction respectively, the third direction size is the arrangement direction of the winding core inside the battery cell to be manufactured, the first direction and the second direction are both perpendicular to the third direction, and the first direction and the second direction are perpendicular to each other; The space gap size includes a space gap size in a first direction, a space gap size in a second direction and / or a space gap size in a third direction.

4. The method for manufacturing a battery cell according to claim 3, characterized in that: The corresponding redundant size data includes: redundant size data of the first design type, redundant size data of the second design type, redundant size data of the third design type, redundant size data of the fourth design type and redundant size data of the fifth design type; The redundant dimension data of the first design type includes: a space gap dimension of the first design type in the first direction and a space gap dimension of the first design type in the second direction; the space gap dimension of the first design type in the first direction is 1 mm to 10 mm, and the space gap dimension of the first design type in the second direction is 2 mm to 15 mm; The redundant dimension data of the second design type includes: the space gap dimension of the second design type in the first direction and the space gap dimension of the second design type in the second direction; the space gap dimension of the second design type in the first direction is 3 mm to 20 mm; the space gap dimension of the second design type in the second direction is 1.5 mm to 12 mm; The redundant dimension data of the third design type includes: the space gap dimension of the third design type in the first direction and the space gap dimension of the third design type in the second direction; the space gap dimension of the third design type in the first direction is 4 mm to 40 mm; the space gap dimension of the third design type in the second direction is 1 mm to 10 mm; The redundant dimension data of the fourth design type includes: a space gap dimension of the fourth design type in the first direction and a space gap dimension of the fourth design type in the second direction; the space gap dimension of the fourth design type in the first direction is 2 mm to 15 mm; the space gap dimension of the fourth design type in the second direction is 1 mm to 10 mm; The redundant dimension data of the fifth design type includes: the spatial gap dimension of the fifth design type in the first direction and the spatial gap dimension of the fifth design type in the second direction; the spatial gap dimension of the fifth design type in the first direction is 1.5mm~12mm; the spatial gap dimension of the fifth design type in the second direction is 2mm~15mm.

5. The method for manufacturing a battery cell according to claim 4, characterized in that: The determining the corresponding space utilization value according to the corresponding redundant size data includes: Wherein, k is the space utilization value, L is the size of the battery cell to be manufactured in the first direction, H is the size of the battery cell to be manufactured in the second direction, N is the preset battery cell internal space design type, l N is the space gap size in the first direction corresponding to the preset battery cell internal space design type, h N The space gap size in the second direction corresponds to the preset battery cell internal space design type.

6. The method for manufacturing a battery cell according to claim 5, characterized in that: After comparing the corresponding space utilization values ​​and obtaining the comparison result, the following steps are further included: The space design type corresponding to the maximum space utilization rate in the comparison result is used as the space design type of the battery cell to be manufactured.

7. The method for manufacturing a battery cell according to claim 3, characterized in that: The determining of the corresponding space utilization value according to the corresponding redundant size data includes: obtaining a redundant value, determining the space utilization value according to the redundant value, The redundancy values ​​are: l N ×h N Where N is the preset internal space design type of the battery cell, l N is the space gap size in the first direction corresponding to the preset battery cell internal space design type, h N The space gap size in the second direction corresponds to the preset battery cell internal space design type.

8. The method for manufacturing a battery cell according to claim 7, characterized in that: After comparing the corresponding space utilization values ​​and obtaining the comparison result, the following steps are further included: The space design type corresponding to the minimum redundancy value in the comparison result is determined as the space design type corresponding to the maximum space utilization rate, and the space design type corresponding to the maximum space utilization rate is used as the space design type of the battery cell to be manufactured.

9. The method for manufacturing a battery cell according to claim 3, characterized in that: The preset battery cell internal space design type has the same dimensions in the third direction.

10. A lithium ion battery cell, characterized in that: It comprises a lithium ion battery cell obtained by the battery cell manufacturing method according to any one of claims 1 to 9.

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