Battery cell manufacturing method and lithium ion battery cell
Patent Information
- Application Number
- PCT/CN2026/083181
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2025-03-13
- Filing Date
- 2026-03-12
- Publication Date
- 2026-09-17
Smart Images
Figure CN2026083181_17092026_PF_FP_ABST
Abstract
Description
A method for manufacturing a battery cell and a lithium-ion battery cell
[0001] This application claims priority to Chinese Patent Application No. CN202510296239.6, filed on March 13, 2025, entitled "A Method for Manufacturing a Battery Cell and a Lithium-ion Battery Cell", the entire contents of which are incorporated herein by reference. Technical Field
[0002] This application relates to the field of battery cell manufacturing technology, and in particular to a battery cell manufacturing method and a lithium-ion battery cell. Background Technology
[0003] With the rapid development of electric vehicles and energy storage technologies, lithium-ion cells, as the core energy storage unit, directly determine the driving range of a vehicle and the efficiency of the energy storage system. As the basic energy storage unit of lithium-ion batteries, the internal spatial structure design of the cell has a significant impact on energy density, cost, and the overall performance of the cell pack. However, currently, cell size is often limited by the manufacturing capabilities and costs of structural component suppliers, resulting in low utilization of the internal space of the cell, affecting energy density improvement, increasing the number of cells and cost, and simultaneously increasing the volume and weight of the cell pack, reducing the overall energy efficiency and design flexibility of the vehicle.
[0004] Currently, the market has higher requirements for range anxiety and storage efficiency in battery packs, especially with today's high-range driving demands. Improving cell energy density is urgently needed, making maximizing cell space utilization within the same size range extremely important. A well-designed spatial structure not only achieves higher energy density within a limited battery size but also significantly reduces cell cost, enhancing the cell's market competitiveness. Summary of the Invention
[0005] This application provides a battery cell manufacturing method 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 spatial design types. This makes the spatial structure design of the battery cell more reasonable, improves the space utilization rate of the battery cell of the same size, reduces the manufacturing cost of the battery cell, and enhances the market competitiveness of the battery cell.
[0006] In a first aspect, this application provides a battery cell manufacturing method, comprising: obtaining a preset battery cell internal space design type; determining corresponding redundant dimension data according to the preset battery cell internal space design type, wherein the redundant dimension data is the space gap dimension in the battery cell internal space setting type; determining a corresponding space utilization value according to the corresponding redundant dimension data; comparing the corresponding space utilization 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.
[0007] The above scheme defines the preset internal space design type of the battery cell as a predefined internal structural layout and space utilization scheme during the battery cell manufacturing process. The arrangement of the internal electrode plates will differ for different preset internal space design types, resulting in different redundant dimension data within the battery cell. The redundant dimension data yields the space utilization rate value for the corresponding preset internal space design type. Space utilization rate refers to the ratio of the volume actually used for energy storage within 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 design scheme can be found, thereby achieving higher energy density within a limited battery size. This method reduces the manufacturing cost of the battery cell and enhances its market competitiveness. Since the space utilization rate varies for battery cells of different sizes 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. This makes the spatial structure design of the battery cell more reasonable, improves the space utilization rate of the battery cell within the same size, reduces the manufacturing cost of the battery cell, and enhances its market competitiveness.
[0008] In one possible design, the preset internal space design type of the battery cell is determined based on the relative positions of the battery cell's terminals and tabs. The preset internal space design type of the battery cell includes at least a first design type when the battery cell's terminals and tabs are in a first relative position, a second design type when the battery cell's terminals and tabs are in a second relative position, a third design type when the battery cell's terminals and tabs are in a third relative position, a fourth design type when the battery cell's terminals and tabs are in a fourth relative position, and a fifth design type when the battery cell's terminals and tabs are in a fifth relative position. The corresponding redundant dimension data includes at least 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.
[0009] Through the above scheme, the relative positions of the terminals and tabs in battery cell design have a significant impact on the internal space utilization, energy density, and overall performance of the cell. By presetting different relative positions of the terminals and tabs, various design types can be formed, each corresponding to different redundancy dimensions and space utilization. For example: Design Type 1: The terminals and tabs are located in a specific relative position, forming a specific internal space layout. Design Types 2, 3, 4, and 5 represent design types where the positions of the terminals and tabs are all different. By comparing the space utilization and redundancy dimensions of different design types, the optimal design scheme can be selected, achieving a reasonable spatial structure design at the lowest cost.
[0010] In one possible design, the method further includes: acquiring the size data of the battery cell to be manufactured; the size data of the battery cell to be manufactured includes the dimensions of the battery cell to be manufactured in the first direction, the second direction and the third direction, respectively, the third direction dimension being the arrangement direction of the winding core inside the battery cell to be manufactured, the first direction and the second direction being perpendicular to the third direction, and the first direction and the second direction being perpendicular to each other; the spatial gap dimension includes the spatial gap dimension in the first direction, the spatial gap dimension in the second direction and / or the spatial gap dimension in the third direction.
[0011] By employing the above approach, in battery cell design, by acquiring the dimensional data of the cell to be manufactured (including dimensions in the first, second, and third directions) and combining it with the spatial clearance dimensions (including redundant dimensions in the three directions), more precise optimization of the internal space of the cell can be achieved. Precise spatial clearance design can reduce material waste and debugging costs during manufacturing. By optimizing the internal structure of the cell and reducing unnecessary space reservations, material usage and production costs can be reduced.
[0012] In one possible design, the corresponding redundant dimensional data includes: redundant dimensional data for a first design type, redundant dimensional data for a second design type, redundant dimensional data for a third design type, redundant dimensional data for a fourth design type, and redundant dimensional data for a fifth design type; wherein, the redundant dimensional data for the first design type includes: the spatial clearance dimension of the first design type in a first direction and the spatial clearance dimension of the first design type in a second direction; the spatial clearance dimension of the first design type in the first direction is 1mm to 10mm, and the spatial clearance dimension of the first design type in the second direction is 2mm to 15mm; the redundant dimensional data for the second design type includes: the spatial clearance dimension of the second design type in the first direction and the spatial clearance dimension of the second design type in the second direction; the spatial clearance dimension of the second design type in the first direction is 3mm to 20mm; the spatial clearance dimension of the second design type in the second direction is 1.5mm to 12mm; the redundant dimensional data for the third design type... The dimensional data includes: the spatial clearance dimensions of the third design type in the first direction and the spatial clearance dimensions of the third design type in the second direction; the spatial clearance dimension of the third design type in the first direction is 4mm to 40mm; the spatial clearance dimension of the third design type in the second direction is 1mm to 10mm; the redundant dimensional data of the fourth design type includes: the spatial clearance dimensions of the fourth design type in the first direction and the spatial clearance dimensions of the fourth design type in the second direction; the spatial clearance dimension of the fourth design type in the first direction is 2mm to 15mm; the spatial clearance dimension of the fourth design type in the second direction is 1mm to 10mm; the redundant dimensional data of the fifth design type includes: the spatial clearance dimensions of the fifth design type in the first direction and the spatial clearance dimensions of the fifth design type in the second direction; the spatial clearance dimension of the fifth design type in the first direction is 1.5mm to 12mm; the spatial clearance dimension of the fifth design type in the second direction is 2mm to 15mm.
[0013] In the above scheme, redundant dimension data in battery cell design refers to the spatial gap dimensions in various directions within the battery cell. These gap dimensions directly affect the space utilization rate of the battery cell, thereby affecting the energy density and overall performance of the battery cell. The spatial gap dimensions in the first and second directions differ depending on the preset internal space design type of the battery cell. By precisely controlling the redundant dimension data, material waste and debugging costs during the production process can be reduced.
[0014] In one possible design, the corresponding space utilization value is determined based on the corresponding redundant size data, including:
[0015] Where k is the space utilization rate, L is the dimension of the cell to be manufactured in the first direction, H is the dimension of the cell to be manufactured in the second direction, N is the preset internal space design type of the cell, and l N h is the spatial gap dimension in the first direction corresponding to the preset internal space design type of the battery cell. N The spatial gap size in the second direction corresponds to the preset internal space design type of the battery cell.
[0016] The above method utilizes the space utilization rate value k to accurately calculate the effective proportion of space actually used for energy storage. By calculating the space utilization rate value k for different design types, it is possible to intuitively compare which design type achieves higher space utilization for a given size. This helps in selecting the optimal design and the most suitable design type. Higher space utilization means that more energy can be stored within the same cell size, thereby reducing the number of cells and material usage required. This directly reduces manufacturing costs and improves the product's cost-effectiveness.
[0017] In one possible design, after comparing the corresponding space utilization values and obtaining the comparison results, the following steps are also included: taking the space design type corresponding to the maximum space utilization value in the comparison results as the space design type of the battery cell to be manufactured.
[0018] The above approach maximizes space utilization, meaning that more active material can be accommodated within the same cell size, significantly improving the cell's energy density. Choosing the optimal space design type ensures a more compact arrangement of cells within the battery pack, thereby enhancing the overall performance of the battery pack.
[0019] In one possible design, the corresponding space utilization value is determined based on the corresponding redundant size data, including: obtaining the redundancy value, and determining the space utilization value based on the redundancy value.
[0020] Redundancy value: l N ×h N
[0021] Where N is the preset internal space design type of the battery cell, l N h is the spatial gap dimension in the first direction corresponding to the preset internal space design type of the battery cell. N The spatial gap size in the second direction corresponds to the preset internal space design type of the battery cell.
[0022] By employing the above method and calculating redundancy values, the space utilization rate of each design type can be accurately assessed. Determining the redundancy value as the product of the space gap dimension in the first direction and the space gap dimension in the second direction for the corresponding preset internal space design type of the battery cell is more accurate and helps identify which design types are more efficient in space utilization.
[0023] In one possible design, after comparing the corresponding space utilization values and obtaining the comparison results, the following steps are also included: determining the space design type corresponding to the minimum redundancy value in the comparison results as the space design type corresponding to the maximum space utilization value, and using the space design type corresponding to the maximum space utilization value as the space design type of the battery cell to be manufactured.
[0024] The "minimum redundancy" in the above scheme actually refers to minimizing the unutilized space inside the battery cell, i.e., maximizing space utilization. For each preset internal space design type of the battery cell, the sum of its spatial gap dimensions in the first and second directions is calculated to obtain the redundancy value of that design type. The redundancy values of all design types are compared, and the minimum value is found. The design type with the minimum redundancy value (i.e., the maximum space utilization) is determined as the space design type of the battery cell to be manufactured. The determined optimal design type is then used for battery cell manufacturing. This method ensures that the battery cell design achieves optimal space utilization. This not only improves the performance and safety of the battery cell but also reduces costs and environmental impact, making it an efficient and environmentally friendly battery cell design method.
[0025] In one possible design, the pre-designed internal space of the battery cell has equal dimensions in the third direction.
[0026] With the above approach, a battery cell of the same size means that its dimensions are uniform in all directions. That is, in the direction of the arrangement of the cores inside the cell (usually referring to the height or thickness direction of the cell), the dimensions of different design types are consistent. Furthermore, standardized cell dimensions help reduce inventory costs.
[0027] Secondly, this application provides a lithium-ion battery cell, including a lithium-ion battery cell obtained by any of the above-described battery cell manufacturing methods.
[0028] The beneficial effects of the lithium-ion battery cells provided in the second aspect and the various possible designs of the second aspect can be found in the first aspect and the various possible implementations of the first aspect, and will not be repeated here.
[0029] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description
[0030] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0031] Figure 1 is a flowchart of a battery cell manufacturing method provided in an embodiment of this application.
[0032] Figure 2 is a schematic diagram of a first design type of battery cell provided in an embodiment of this application.
[0033] Figure 3 is a schematic diagram of the cross-sectional structure of the battery cell provided in Figure 2.
[0034] Figure 4 is a schematic diagram of a second design type of battery cell provided in an embodiment of this application.
[0035] Figure 5 is a schematic diagram of the cross-sectional structure of the battery cell provided in Figure 4.
[0036] Figure 6 is a schematic diagram of a third design type of battery cell provided in an embodiment of this application.
[0037] Figure 7 is a schematic diagram of the cross-sectional structure of the battery cell provided in Figure 6.
[0038] Figure 8 is a schematic diagram of a fourth design type of battery cell provided in an embodiment of this application.
[0039] Figure 9 is a schematic diagram of the cross-sectional structure of the battery cell provided in Figure 8.
[0040] Figure 10 is a schematic diagram of a fifth design type of battery cell provided in an embodiment of this application.
[0041] Figure 11 is a schematic diagram of the cross-sectional structure of the battery cell shown in Figure 10.
[0042] Explanation of reference numerals in the attached drawings: 101, First housing; 102, First positive terminal; 103, First negative terminal; 104, First spatial gap; 201, Second housing; 202, Second positive terminal; 203, Second negative terminal; 204, Second terminal side; 205, Second positive terminal side; 206, Second negative terminal side; 301, Third housing; 302, Third positive terminal; 303, Third negative terminal; 304, Third positive terminal side; 305, Third negative terminal side; 401, Fourth housing; 402, Fourth positive terminal; 403, Fourth negative terminal; 404, Fourth spatial gap Gap; 501, Fifth Housing; 502, Fifth Positive Terminal; 503, Fifth Negative Terminal; 504, Side of Fifth Positive Terminal; 505, Side of Fifth Negative Terminal; 506, Side of Fifth Tab; 601, Sixth Housing; 602, Sixth Positive Terminal; 603, Sixth Negative Terminal; 604, Sixth Core; 605, Sixth Positive Tab; 606, Sixth Positive Connection; 607, Sixth Negative Tab; 608, Sixth Negative Connection; 609, Sixth Lower Plastic; 701, Seventh Housing; 702, Seventh Positive Terminal; 703, Seventh Negative Terminal; 704, Seventh Core; 705, Seventh positive tab; 706, Seventh positive connection; 707, Seventh negative tab; 708, Seventh negative connection; 709, Seventh lower plastic; 801, Eighth housing; 802, Eighth positive post; 803, Eighth negative post; 804, Eighth core; 805, Eighth positive tab; 806, Eighth positive connection; 807, Eighth negative tab; 808, Eighth negative connection; 809, Eighth lower plastic; 802, Eighth positive post; 810, Eighth lower plastic; 803, Eighth negative post; 901, Ninth housing; 902 903. Ninth positive terminal; 904. Ninth negative terminal; 905. Ninth positive electrode tab; 906. Ninth positive connection; 907. Ninth negative electrode tab; 908. Ninth negative connection; 909. Ninth lower plastic; 1001. Tenth shell; 1002. Tenth positive terminal; 1003. Tenth negative terminal; 1004. Tenth core; 1005. Tenth positive electrode tab; 1006. Tenth positive connection; 1007. Tenth negative electrode tab; 1008. Tenth negative connection; 1009. Tenth positive lower plastic; 1010. Tenth negative lower plastic. Detailed Implementation
[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.
[0045] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0046] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist simultaneously, or B exists. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.
[0047] The directional terms appearing in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this application. For example, in the description of this application, the terms "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 figures. They are only for the convenience of describing this application 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 application.
[0048] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.
[0049] In the description of this application, unless otherwise stated, "multiple" means two or more (including two), and similarly, "multiple groups" means two or more (including two groups).
[0050] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, "connection" or "joining" in mechanical structures can refer to a physical connection, such as a fixed connection, for example, a connection fixed by a partition, such as a connection fixed by screws, bolts, or other partitions; a physical connection can also be a detachable connection, such as a snap-fit or interlocking connection; a physical connection can also be an integral connection, such as a connection formed by welding, bonding, or integral molding. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0051] As can be seen from the background technology, maximizing the space utilization of battery cells of the same size is of great significance.
[0052] Analysis shows that while existing technologies are constantly seeking to increase energy density, they are basically based on the supplier's manufacturing capabilities, trying to increase the number of cells as much as possible. However, they cannot take into account the different space utilization rates of cells of different specifications and sizes in different spatial design types.
[0053] In view of this, embodiments of this application provide a battery cell manufacturing method and a lithium-ion battery cell, starting from the perspective of selecting a certain space design type with the highest space utilization rate for battery cells of different sizes. By using redundant size data, the corresponding preset space utilization rate value for the internal space design type of the battery cell can be obtained. Space utilization rate refers to the ratio of the volume actually used for energy storage within 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, thereby achieving higher energy density and better performance within a limited battery size. This makes the spatial structure design of the battery cell more reasonable, improves the space utilization rate of the battery cell within the same size, reduces the manufacturing cost of the battery cell, and enhances the market competitiveness of the battery cell.
[0054] To enable those skilled in the art to better understand 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.
[0055] Figure 1 is a flowchart of a battery cell manufacturing method according to an embodiment of this application. Referring to Figure 1, this application provides a battery cell manufacturing method, including:
[0056] Step 1: Obtain the preset internal space design type of the battery cell, and determine the corresponding redundant size data according to the preset internal space design type of the battery cell. The redundant size data is the space gap size in the internal space setting type of the battery cell.
[0057] The space gap dimensions in the internal space arrangement type of the battery cell include the thickness of other mechanical structures inside the battery cell, excluding the electrode plates, such as the thickness of necessary mechanical components like the top cover, lower plastic, and brackets.
[0058] The preset internal space design type of the battery cell refers to the internal structural layout or space utilization scheme of the battery cell that is set in advance before the battery cell is manufactured.
[0059] In battery cell design, the relative positions of the terminals and tabs significantly impact the cell's internal space utilization, energy density, and overall performance. By presetting different relative positions of the terminals and tabs, various design types can be created, each corresponding to different redundancy dimensions and space utilization. The pre-set internal space design types for the battery cell are determined based on the relative positions of the terminals and tabs; these pre-set internal space design types include at least a first design type when the terminals and tabs are in a first relative position, a second design type when the terminals and tabs are in a second relative position, a third design type when the terminals and tabs are in a third relative position, a fourth design type when the terminals and tabs are in a fourth relative position, and a fifth design type when the terminals and tabs are in a fifth relative position.
[0060] The first design type in this embodiment refers to the case where the electrode posts and tabs are located on the same side in the height direction of the cell. Figure 2 is a schematic diagram of the cell with the first design type provided in this embodiment. Referring 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 electrode post 102 and the first negative electrode post 103 are located on the same side in the width direction, and the direction of the tabs is consistent with the direction of the electrode posts. At this time, the first space gap 104 inside the cell is located on the tab side (or electrode post side) of the cell.
[0061] The second design type in this embodiment refers to the case where the terminal post is on the same side and the tabs are at both ends. Figure 4 is a schematic diagram of the cell with the second design type provided in this embodiment. Referring to Figure 4, the second design type can also be called a C-type structure. In the second housing 201 of a specific size, the second positive terminal post 202 and the second negative terminal post 203 are located on the same side, and the direction of the tabs is perpendicular to the direction of the terminal post. At this time, the space gap inside the cell is mainly located in three directions: the second terminal post side 204, the second positive tab side 205, and the second negative tab side 206.
[0062] Understandably, the second design type usually requires the addition of an L-shaped adapter plate.
[0063] The third design type in this embodiment refers to the case where both ends have tabs and both ends have terminals. Figure 6 is a schematic diagram of the battery cell with the third design type provided in this embodiment. Referring to Figure 6, the third design type can also be called an H-type structure. In the third housing 301 of a specific size, the third positive terminal 302 and the positive tab are on the same side, while the third negative terminal 303 and the negative tab are on the other side. At this time, the internal space gaps of the battery cell are located on the third positive tab side 304 and the third negative tab side 305, respectively.
[0064] The fourth design type in this embodiment refers to the case where the electrode posts and tabs are located on the same side in the width direction of the cell. Figure 8 is a schematic diagram of the cell with the fourth design type provided in this embodiment. Referring to Figure 8, the fourth design type can also be called a 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 located on the same side in the height direction, and the direction of the tabs is consistent with the direction of the electrode posts. At this time, the fourth space gap 404 inside the cell is located on the tab side (also called the electrode post side) of the cell.
[0065] In this embodiment, the fifth design type refers to the design of tabs on the same side and pole posts at both ends. The fifth design type can also be called the HA type structure, as shown in Figure 10. In the fifth housing 501 of a specific size, the fifth positive pole post 502 and the fifth negative pole post 503 are located on both sides of the width direction, while the positive and negative tabs are on the same side of the cell width direction. At this time, the space gap inside the cell is mainly located in three directions: the fifth positive pole post side 504, the fifth negative pole post side 505, and the fifth tab side 506.
[0066] With the same internal space of the battery cell, the space utilization results are different when the internal structure design of the aforementioned preset internal space design type of the battery cell is adopted. Moreover, for battery cells of different specifications and sizes, it is possible to select one of the space design types, which has the highest space utilization.
[0067] Step 2: Determine the corresponding space utilization value based on the corresponding redundant size data.
[0068] The corresponding redundant dimension data includes at least 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.
[0069] The arrangement of the internal electrodes will differ depending on the different preset internal space design types of the battery cell, and therefore the redundant dimension data inside the battery cell will also be different. The space utilization rate value for the corresponding preset internal space design type can be obtained from the redundant dimension data. The space utilization rate refers to the ratio of the volume actually used for energy storage inside the battery cell to the total volume of the battery cell.
[0070] In this embodiment, before determining the corresponding space utilization value based on the corresponding redundant size data, the method may further include: obtaining the size data of the battery cell to be manufactured; the size data of the battery cell to be manufactured includes the dimensions of the battery cell to be manufactured in the first direction, the second direction, and the third direction, respectively, where the third direction dimension is the arrangement direction of the core winding 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 dimension includes the space gap dimension in the first direction, the space gap dimension in the second direction, and / or the space gap dimension in the third direction.
[0071] By employing the above approach, in battery cell design, by acquiring the dimensional data of the cell to be manufactured (including dimensions in the first, second, and third directions) and combining it with the spatial clearance dimensions (including redundant dimensions in the three directions), more precise optimization of the internal space of the cell can be achieved. Precise spatial clearance design can reduce material waste and debugging costs during manufacturing. By optimizing the internal structure of the cell and reducing unnecessary space reservations, material usage and production costs can be reduced.
[0072] In this embodiment, the preset internal space design type of the battery cell has equal dimensions in the third direction.
[0073] With the above scheme, the dimensions of the battery cell of the same size are uniform in all directions. That is, the dimensions of different design types are consistent in the arrangement direction of the winding core inside the battery cell (usually referring to the height or thickness direction of the battery cell).
[0074] In this embodiment, the corresponding redundant dimension data includes: redundant dimension data of a first design type, redundant dimension data of a second design type, redundant dimension data of a third design type, redundant dimension data of a fourth design type, and redundant dimension data of a fifth design type; wherein, the redundant dimension data of the first design type includes: the spatial gap dimension of the first design type in a first direction and the spatial gap dimension of the first design type in a second direction; the spatial gap dimension of the first design type in the first direction is 1mm to 10mm, and the spatial gap dimension of the first design type in the second direction is 2mm to 15mm; 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 3mm to 20mm; the spatial gap dimension of the second design type in the second direction is 1.5mm to 12mm; the redundant dimension of the third design type... The data includes: the spatial clearance dimensions of the third design type in the first direction and the spatial clearance dimensions of the third design type in the second direction; the spatial clearance dimension of the third design type in the first direction is 4mm to 40mm; the spatial clearance dimension of the third design type in the second direction is 1mm to 10mm; the redundant dimension data of the fourth design type includes: the spatial clearance dimensions of the fourth design type in the first direction and the spatial clearance dimensions of the fourth design type in the second direction; the spatial clearance dimension of the fourth design type in the first direction is 2mm to 15mm; the spatial clearance dimension of the fourth design type in the second direction is 1mm to 10mm; the redundant dimension data of the fifth design type includes: the spatial clearance dimensions of the fifth design type in the first direction and the spatial clearance dimensions of the fifth design type in the second direction; the spatial clearance dimension of the fifth design type in the first direction is 1.5mm to 12mm; the spatial clearance dimension of the fifth design type in the second direction is 2mm to 15mm.
[0075] In the above scheme, redundant dimension data in battery cell design refers to the spatial gap dimensions in various directions within the battery cell. These gap dimensions directly affect the space utilization rate of the battery cell, thereby affecting the energy density and overall performance of the battery cell. The spatial gap dimensions in the first and second directions differ depending on the preset internal space design type of the battery cell. By precisely controlling the redundant dimension data, material waste and debugging costs during the production process can be reduced.
[0076] In this embodiment, determining the corresponding space utilization value based on the corresponding redundant size data includes:
[0077] Where k is the space utilization rate, L is the dimension of the cell to be manufactured in the first direction, H is the dimension of the cell to be manufactured in the second direction, N is the preset internal space design type of the cell, and l N h is the spatial gap dimension in the first direction corresponding to the preset internal space design type of the battery cell. N The spatial gap size in the second direction corresponds to the preset internal space design type of the battery cell.
[0078] Figure 3 is a schematic cross-sectional view of the battery cell shown in Figure 2. As shown in Figure 3, in the first design type, in a specific sixth housing 601, the sixth positive terminal 602 and the sixth negative terminal 603 are arranged on the same side along the width direction. Current flows through the positive terminal at the sixth positive connection point 606 of the sixth positive terminal tab 605 of the sixth core 604, and through the negative terminal at the sixth negative connection point 608 of the sixth negative terminal tab 607 of the sixth core 604. The sixth lower plastic 609 is located on the terminal side, where the space gap is relatively large. Given a fixed dimension in the third direction W of the battery cell, if the space gap dimension in the first direction of the battery of the first design type is l... U The spatial clearance dimension in the second internal direction is h. U Therefore, the formula for calculating the space utilization rate k of the first design type is:
[0079] Figure 5 is a schematic diagram of the cross-sectional structure of the battery cell provided in Figure 4. As shown in Figure 5, in the second design type, in a specific seventh housing 701, the seventh positive terminal 702 and the seventh negative terminal 703 are on the same side, and the positive current flows through the seventh positive connection 706 of the seventh positive terminal tab 705 of the seventh core 704, and the negative current flows through the seventh negative connection 708 of the seventh negative terminal tab 707 of the seventh core 704. The seventh lower plastic 709 is located on the terminal side, where the space and the distance between the two terminal tabs are larger. Given a fixed dimension in the third direction W of the battery cell, if the internal spatial clearance dimension of the battery in the second design type is l... A The spatial clearance dimension in the second internal direction is h. A Then, the formula for calculating the space utilization rate k is:
[0080] Figure 7 is a schematic diagram of the cross-sectional structure of the battery cell provided in Figure 6. As shown in Figure 7, in the third design type, in a specific eighth housing 801, the eighth positive terminal 802 and the eighth negative terminal 803 are opposite each other, and the eighth positive connection 806 of the eighth positive terminal tab 805 of the eighth core 804 allows for positive current flow, while the eighth negative connection 808 of the eighth negative terminal tab 807 of the eighth core 804 allows for negative current flow. The eighth positive lower plastic 809 is located on the side where the eighth positive terminal 802 is located, and the eighth negative lower plastic 810 is located on the side where the eighth negative terminal 803 is located. The spatial gap between these two locations is relatively large. Given a fixed dimension in the third direction W of the battery cell, if the spatial gap dimension l in the first internal direction of the battery of the third design type is... H The spatial clearance dimension in the second internal direction is h. H Then, the formula for calculating the space utilization rate k is:
[0081] Figure 9 is a schematic diagram of the cross-sectional structure of the battery cell provided in Figure 8. As shown in Figure 9, in the fourth design type, in a specific ninth housing 901, the ninth positive terminal 902 and the ninth negative terminal 903 extend to the same side along the height direction, allowing current to flow in the positive direction through the ninth positive connection 906 of the ninth positive tab 905 of the ninth core 904, and in the negative direction through the ninth negative connection 908 of the ninth negative tab 907 of the ninth core 904. The ninth lower plastic 909 is located on the terminal side (also called the tab side), where the spatial spacing is larger. Given a fixed dimension in the third direction W of the battery cell, if the spatial gap dimension in the first internal direction of the fourth design type of battery is l... C The spatial clearance dimension in the second internal direction is h. C Then, the formula for calculating the space utilization rate k is:
[0082] Figure 11 is a schematic diagram of the cross-sectional structure of the battery cell provided in Figure 10. As shown in Figure 11, in the HA type structure, in a specific tenth casing 1001, the tenth positive terminal 1002 and the tenth negative terminal 1003 are opposite each other, and the positive current flows through the tenth positive connection 1006 of the tenth positive terminal tab 1005 of the tenth core 1004, and the negative current flows through the tenth negative connection 1008 of the tenth negative terminal tab 1007 of the tenth core 1004. The tenth positive lower plastic 1009 is located on the positive terminal side, and the tenth negative lower plastic 1010 is located on the negative terminal side, with a larger spatial distance between these two locations. Given a fixed dimension in the third direction W of the battery cell, if the spatial gap dimension in the first internal direction of the fifth design type battery is l... HA The spatial clearance dimension in the second internal direction is h. HA Then, the formula for calculating the space utilization rate k is:
[0083] The above scheme utilizes the space utilization rate value k to accurately calculate the effective proportion of space actually used for energy storage. By calculating the space utilization rate value k for different design types, it is possible to intuitively compare which design type achieves higher space utilization for a given size. The above methods for calculating space utilization for different types of structural designs facilitate the selection of the most reasonable structural design for a specific battery size, maximizing the utilization of the battery's internal space, reducing costs, and enhancing the battery's market competitiveness.
[0084] Step 3: Compare the corresponding space utilization values to obtain the comparison results.
[0085] In this embodiment, after comparing the corresponding space utilization values and obtaining the comparison results, the method further includes the step of using the space design type corresponding to the maximum space utilization value in the comparison results as the space design type of the battery cell to be manufactured.
[0086] The above approach maximizes space utilization, meaning that more active material can be accommodated within the same cell size, significantly improving the cell's energy density. Choosing the optimal space design type ensures a more compact arrangement of cells within the battery pack, thereby enhancing the overall performance of the battery pack.
[0087] Step 4: Determine the spatial design type of the battery cell to be manufactured based on the comparison results, and assemble the battery cell according to the spatial design type of the battery cell to be manufactured.
[0088] By comparing the space utilization rates of different preset design types, the optimal design scheme can be found, thereby achieving higher energy density and better performance within a limited battery size. This method reduces the manufacturing cost of battery cells and enhances their market competitiveness.
[0089] 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 battery cell thickness is constant, the battery cell width L is 300 mm, the battery cell height H (including the electrode post) is 116 mm, and the battery cell core size is constant: 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. Calculations based on the H-type structure design show that its width redundancy (l) is 16mm and its height redundancy is 1.6mm; calculations based on the C-type structure design show that its width redundancy (l) is 6.2mm and its height redundancy is 2mm; calculations based on the HA-type structure design show that its width redundancy (l) is 16mm and its height redundancy is 1.6mm. Therefore, the effective space utilization rates of the battery cell are: C-type 96.2% > U-type 94.0% > H-type 93.4% > HA-type 93.0% > A-type 92.3%. In this case, the optimal internal structure design for the battery cell is the C-type.
[0090] Table 1:
[0091] In some embodiments, as shown in Table 2, when the cell thickness is constant, assuming the cell width L is 600mm, the cell height H (including the electrode post) is 116mm, and the core size is constant: According to the U-shaped structure design, the redundancy in the width direction l is 2mm, and the redundancy in the height direction is 6.2mm; according to the A-shaped structure design, the redundancy in the width direction l is 10mm, and the redundancy in the height direction is 5.2mm; according to the H-shaped structure design, the redundancy in the width direction l... The width is 16mm and the height redundancy is 1.6mm. According to the C-type structure design, the width redundancy is 6.2mm and the height redundancy is 2mm. According to the HA-type structure design, the width redundancy is 16mm and the height redundancy is 2mm. Therefore, the effective space utilization rates of the battery cell are U-type 97.3% > H-type 96.0% > HA-type 95.7% > U-type 94.3% > A-type 93.9%. That is, the optimal internal structure design of the battery cell is C-type.
[0092] All thicknesses mentioned above include the thickness of the battery cell casing.
[0093] All thicknesses mentioned above include the thickness of the battery cell casing.
[0094] Table 2:
[0095] In some embodiments, as shown in Table 3, when the cell thickness is constant, assuming the cell width L is 148mm, the cell height H (including the electrode post) is 204mm, and the cell winding size is constant: according to the U-shaped structure design scheme, the redundant dimension l in the width direction is 2mm, and the redundant dimension in the height direction is 6.2mm.
[0096] According to the design scheme of type A structure, the redundancy dimension l in the width direction is 10mm and the redundancy dimension in the height direction is 5.2mm.
[0097] According to the H-shaped structure design, the redundant dimension l in the width direction is 16mm and the redundant dimension in the height direction is 1.6mm.
[0098] According to the C-shaped structure design, the redundant dimension l in the width direction is 6.2mm and the redundant dimension in the height direction is 2mm.
[0099] According to the H-shaped structure design, the redundant dimension l in the width direction is 16mm and the redundant dimension in the height direction is 2mm.
[0100] Therefore, the effective space utilization rates of the battery cells are as follows: U-type 95.7% > C-type 94.9% > A-type 90.9% > H-type 88.5% > HA-type 88.3%. This means the optimal internal structure design for the battery cell is U-shaped. All thicknesses mentioned above include the battery cell casing thickness.
[0101] Table 3:
[0102] As shown in Tables 1, 2 and 3, the internal space design types of battery cells of different sizes are different, and their space utilization rates are different. Therefore, by using the above-mentioned battery cell manufacturing methods, the optimal solution for space utilization can be obtained.
[0103] In one possible design, the corresponding space utilization value is determined based on the corresponding redundant size data. This can be achieved by obtaining the redundancy value and then determining the space utilization value accordingly.
[0104] The redundancy value can be obtained using the following formula. N ×h N
[0105] Where N is the preset internal space design type of the battery cell, l N h is the spatial gap dimension in the first direction corresponding to the preset internal space design type of the battery cell. NThe spatial gap size in the second direction corresponds to the preset internal space design type of the battery cell.
[0106] By employing the above method and calculating redundancy values, the space utilization rate of each design type can be accurately assessed. Determining the redundancy value as the product of the space gap dimension in the first direction and the space gap dimension in the second direction for the corresponding preset internal space design type of the battery cell is more accurate and helps identify which design types are more efficient in space utilization.
[0107] In one possible design, after comparing the corresponding space utilization values and obtaining the comparison results, the following steps are also included: determining the space design type corresponding to the minimum redundancy value in the comparison results as the space design type corresponding to the maximum space utilization value, and using the space design type corresponding to the maximum space utilization value as the space design type of the battery cell to be manufactured.
[0108] The "minimum redundancy" in the above scheme actually refers to minimizing the unutilized space inside the battery cell, i.e., maximizing space utilization. For each preset internal space design type of the battery cell, the sum of its spatial gap dimensions in the first and second directions is calculated to obtain the redundancy value of that design type. The redundancy values of all design types are compared, and the minimum value is found. The design type with the minimum redundancy value (i.e., the maximum space utilization) is determined as the space design type of the battery cell to be manufactured. The determined optimal design type is then used for battery cell manufacturing. This method ensures that the battery cell design achieves optimal space utilization. This not only improves the performance and safety of the battery cell but also reduces costs and environmental impact, making it an efficient and environmentally friendly battery cell design method.
[0109] Based on the above embodiments, this application also provides a lithium-ion battery cell, including a lithium-ion battery cell obtained by any of the above-described battery cell manufacturing methods. Since the battery cell manufacturing methods and beneficial effects have been described in detail above, they will not be repeated here.
[0110] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
Claims
1. A method for manufacturing a battery cell, characterized in that, include: Obtain a preset internal space design type for the battery cell, and determine the corresponding redundant size data according to the preset internal space design type for the battery cell. The redundant size data is the space gap size in the internal space setting type of the battery cell. The corresponding space utilization value is determined based on the corresponding redundant size data. Compare the corresponding space utilization values to obtain the comparison results; Based on the comparison results, the spatial design type of the battery cell to be manufactured is determined, and the battery cell is assembled according to the spatial design type of the battery cell to be manufactured to obtain the battery cell.
2. The cell manufacturing method according to claim 1, characterized in that, The preset internal space design type of the battery cell is determined according to the relative positions of the battery cell's terminals and tabs; The preset internal space design types of the battery cell include at least a first design type when the terminal block and the tab of the battery cell are in a first relative position, a second design type when the terminal block and the tab of the battery cell are in a second relative position, a third design type when the terminal block and the tab of the battery cell are in a third relative position, a fourth design type when the terminal block and the tab of the battery cell are in a fourth relative position, and a fifth design type when the terminal block and the tab of the battery cell are in a fifth relative position. The corresponding redundant dimension data includes at least 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.
3. The cell manufacturing method according to claim 1 or 2, characterized in that, Also includes: Obtain the 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 the first direction, the second direction and the 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 spatial gap dimensions include the spatial gap dimensions in the first direction, the spatial gap dimensions in the second direction, and / or the spatial gap dimensions in the third direction.
4. The cell manufacturing method according to claim 3, characterized in that, 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; 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 1mm to 10mm, and the spatial gap dimension of the first design type in the second direction is 2mm to 15mm. The redundant dimensional 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 3mm to 20mm; the spatial gap dimension of the second design type in the second direction is 1.5mm to 12mm. The redundant dimensional 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 4mm to 40mm; the spatial gap dimension of the third design type in the second direction is 1mm to 10mm. 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 2mm to 15mm; the spatial gap dimension of the fourth design type in the second direction is 1mm to 10mm. 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 to 12mm; the spatial gap dimension of the fifth design type in the second direction is 2mm to 15mm.
5. The cell manufacturing method according to claim 4, characterized in that, The step of determining the corresponding space utilization value based on the corresponding redundant size data includes: Where k is the space utilization rate value, L is the dimension of the cell to be manufactured in the first direction, H is the dimension of the cell to be manufactured in the second direction, N is the preset internal space design type of the cell, and l N To correspond to the preset internal space design type of the battery cell, the spatial gap size in the first direction, h N The spatial gap size in the second direction corresponds to the preset internal space design type of the battery cell.
6. The cell manufacturing method according to claim 5, characterized in that, After comparing the corresponding space utilization values and obtaining the comparison results, the process further includes the following steps: The space design type corresponding to the maximum space utilization rate in the comparison results will be used as the space design type for the battery cell to be manufactured.
7. The cell manufacturing method according to claim 3, characterized in that, Determining the corresponding space utilization value based on the corresponding redundant size data includes: obtaining the redundancy value, and determining the space utilization value based on the redundancy value. The redundancy value is: l N ×h N Where N is the preset internal space design type of the battery cell, l N To correspond to the preset internal space design type of the battery cell, the spatial gap size in the first direction, h N The spatial gap size in the second direction corresponds to the preset internal space design type of the battery cell.
8. The cell manufacturing method according to claim 7, characterized in that, After comparing the corresponding space utilization values and obtaining the comparison results, the process further includes the following steps: The space design type corresponding to the minimum redundancy value in the comparison results 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 cell manufacturing method according to claim 3, characterized in that, The preset internal space design type of the battery cell has the same dimensions in the third direction.
10. A lithium-ion battery cell, characterized in that, This includes lithium-ion cells obtained using the cell manufacturing method described in any one of claims 1 to 9.