Battery and connecting structure of bare battery cell and adapter piece thereof
By dislocating multiple battery cells and connecting them with a set of adapters, the problem of uneven distribution of contact areas of the electrodes of the lithium-ion battery welding is solved, and the battery capacity density is improved and the production process is simplified.
Patent Information
- Application Number
- CN202421535945.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-02
- Publication Date
- 2025-05-13
- Estimated Expiration
- 2034-07-02
AI Technical Summary
In the process of increasing the capacity of the single unit and reducing the battery impedance, the contact area of the welding electrode ear is unevenly distributed, resulting in unstable battery impedance. At the same time, the welding process is complex, which increases production complexity and cost.
A connection structure between bare cell and adapter is adopted. Multiple cells are arranged by misalignment, and only one set of adapter plates are used for connection, forming non-overlapping positive and negative electrode ears, reducing the height occupation of the welding area and simplifying the connection process.
It effectively improves the battery capacity density, simplifies the production process, reduces production costs, and increases the stability of the battery pack.
Smart Images
Figure CN222867970U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a battery and a bare battery core and a connecting piece connection structure thereof, belonging to the field of lithium batteries. Background Art
[0002] With the rapid development of electronic technology, the demand for lithium-ion batteries is increasing, and consumers' performance requirements for lithium-ion batteries are increasing. With the popularity of electric vehicles, the energy storage industry has higher and higher requirements for the capacity and energy density of battery systems. In order to improve the capacity density of lithium-ion batteries, the industry has higher and higher requirements for the single-cell capacity of lithium-ion batteries. In order to improve the capacity density of batteries, the method generally adopted in the industry is to weld the positive and negative pole tabs of the bare battery cell to the positive and negative pole adapters respectively, and then connect the positive and negative pole adapters to the positive and negative pole posts of the battery top cover. In order to increase the single-cell capacity of lithium-ion batteries and reduce battery impedance, it is generally necessary to increase the positive and negative pole piece area of lithium-ion batteries and use as many pole tabs as possible, which leads to uneven distribution of welding contacts during welding. This practice causes unstable battery impedance.
[0003] In order to improve the uniformity of the contact area of the welding pole lugs, the commonly used method is to set up multiple bare cells, weld the bare cells to a set of positive and negative electrode adapters, bend the positive and negative electrode adapters after welding, and then try to connect them to the positive and negative poles. Because this method has multiple adapters between the bare cells and the poles, its welding process is complicated, the pole lugs are distributed in a chaotic manner, and the welding area between the bare cell pole lugs and the adapters occupies a large height. On the one hand, it makes it impossible to fully utilize the internal space of the battery to increase the capacity of the lithium-ion battery, and on the other hand, it increases the complexity of production and pushes up production costs. Utility Model Content
[0004] The utility model aims to provide a bare battery cell and adapter sheet connection structure to solve the technical problems in the above-mentioned background technology.
[0005] The technical solution for achieving the purpose of the utility model is: a bare battery cell and adapter plate connection structure, including a first battery cell, a second battery cell, a third battery cell, a fourth battery cell, a positive adapter plate and a negative adapter plate, the positive and negative pole ears of the first battery cell and the second battery cell are respectively connected to the positive adapter plate and the negative adapter plate to form a first positive electrode, a second positive electrode, a first negative electrode, and a second negative electrode, the first battery cell, the second battery cell and the third battery cell and the fourth battery cell are staggered and connected to the positive adapter plate and the negative adapter plate to form a third positive electrode, a fourth positive electrode, a third negative electrode, and a fourth negative electrode, the first positive electrode, the second positive electrode, the third positive electrode, and the fourth positive electrode do not overlap, and the first negative electrode, the second negative electrode, the third negative electrode, and the fourth negative electrode do not overlap.
[0006] In the utility model, the first battery cell, the second battery cell, the third battery cell, and the fourth battery cell are respectively connected to the positive electrode adapter plate and the negative electrode adapter plate. Only one set of adapter plates is used, which can effectively reduce the height occupied by the welding area between the electrode ear and the adapter plate, occupying less space inside the battery cell, which is beneficial to saving space to increase the battery capacity. The adapter plate does not need to be bent when connected to the outside world, and the connection process between the battery cell and the adapter plate is simpler, which can effectively improve production efficiency.
[0007] Further or optionally, connection point protective glue is provided between the first positive electrode and the third positive electrode, the second positive electrode and the fourth positive electrode, the first negative electrode and the third negative electrode, and the second negative electrode and the fourth negative electrode to prevent interference between the battery cells and increase the stability of the battery pack.
[0008] Further or optionally, the plurality of positive and negative connection points on the positive electrode adapter plate and the negative electrode adapter plate are located on the same straight line, which is beneficial to the arrangement of the welding head during the welding process, so as to improve the welding efficiency and facilitate the access to the automated welding process.
[0009] Further or optionally, the positive and negative electrode tabs are respectively welded or riveted to the positive electrode adapter plate and the negative electrode adapter plate. Specifically, it needs to be confirmed according to the working environment of the battery. When the working environment of the battery pack is prone to weld point falling off, riveting can be added on the basis of the above-mentioned welding connection.
[0010] Further or optionally, the number of monopolar tab layers of the first battery cell, the second battery cell, the third battery cell, and the fourth battery cell is 35 to 75, which is conducive to controlling the overall height of the battery cell.
[0011] The utility model also provides a battery, which adopts any of the above-mentioned bare cell and adapter plate connection structures, so that each sub-cell of the battery is exactly the same, and the control trouble caused by distinguishing different sub-cells in the production process can be reduced.
[0012] By adopting the above technical solution, the utility model has the following beneficial effects:
[0013] (1) In the utility model, the first battery cell, the second battery cell, the third battery cell, and the fourth battery cell are respectively connected to the positive electrode adapter plate and the negative electrode adapter plate. Only one set of adapter plates is used, which can effectively reduce the height occupied by the welding area between the electrode tab and the adapter plate, occupying less space inside the battery cell, which is beneficial to saving space to increase the battery capacity. In addition, the adapter plate does not need to be bent when connected to the outside world, and the connection process between the battery cell and the adapter plate is simpler, which can effectively improve production efficiency.
[0014] (2) The welding point position on the pole ear of the utility model is provided with connection point protection glue to prevent interference between battery cells and increase the stability of the battery pack.
[0015] (3) The multiple positive and negative connection points on the positive electrode adapter and the negative electrode adapter of the utility model are located on the same straight line, which is beneficial to the arrangement of the welding head during the welding process, thereby improving the welding efficiency and facilitating the connection to the automated welding process.
[0016] (4) The number of layers of the monopolar tab of the utility model is 35 to 75, which is conducive to controlling the overall height of the battery cell.
[0017] (5) The utility model also provides a battery, which adopts any of the above-mentioned bare cell and adapter plate connection structures, so that the sub-cells of the battery are exactly the same, and the control trouble caused by distinguishing different sub-cells in the production process can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.
[0019] Figure 1 This is a schematic diagram of the welding method of the battery cell 1 and the battery cell 2 of the utility model;
[0020] Figure 2 It is a structural schematic diagram of the welding method of the battery cell 3 and the battery cell 4 of the utility model;
[0021] Figure 3 This is a schematic diagram of the arrangement position structure of the battery cells of the utility model;
[0022] Figure 4 This is a schematic diagram of the position structure between the battery core and the adapter after being bundled.
[0023] The numbers in the accompanying drawings are: including a first battery cell 1, a first positive electrode 11, a first negative electrode 12, a second battery cell 2, a second positive electrode 21, a second negative electrode 22, a third battery cell 3, a third positive electrode 31, a third negative electrode 32, a fourth battery cell 4, a fourth positive electrode 41, a fourth negative electrode 42, a positive electrode adapter plate 5, and a negative electrode adapter plate 6. DETAILED DESCRIPTION
[0024] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.
[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0028] In the description of the embodiments of the present utility model, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present utility model.
[0029] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly stipulated and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the scope of protection of the utility model.
[0030] (Example 1)
[0031] See Figure 1, a bare cell and adapter connection structure of the present embodiment includes a first cell 1, a second cell 2, a third cell 3, a fourth cell 4, a positive adapter 5 and a negative adapter 6, the positive and negative pole ears of the first cell 1 and the second cell 2 are respectively connected to the positive adapter 5 and the negative adapter 6 to form a first positive electrode 11, a second positive electrode 21, a first negative electrode 12, and a second negative electrode 22, the first cell 1, the second cell 2 and the third cell 3 and the fourth cell 4 are staggered and connected to the positive adapter 5 and the negative adapter 6 to form a third positive electrode 31, a fourth positive electrode 41, a third negative electrode 32, and a fourth negative electrode 42, the first positive electrode 11, the second positive electrode 21, the third positive electrode 31, and the fourth positive electrode 41 do not overlap, and the first negative electrode 12, the second negative electrode 22, the third negative electrode 32, and the fourth negative electrode 42 do not overlap.
[0032] Connection point protection glue is provided between the first positive electrode 11 and the third positive electrode 31 , between the second positive electrode 21 and the fourth positive electrode 41 , between the first negative electrode 12 and the third negative electrode 32 , and between the second negative electrode 22 and the fourth negative electrode 42 .
[0033] like Figure 2 and Figure 3 As shown, during production, the positive and negative electrode sheets are separated by a separation film and are made into the sub-cell by winding or stacking; the positive and negative electrode tabs of the two sub-cells (cell 1 and cell 2) in the lower layer are ultrasonically welded to the positive and negative electrode adapter sheets respectively, and then weld mark protective glue is affixed to the ultrasonic weld mark, and the weld mark protective glue is controlled not to cover the weld mark area of the upper cell.
[0034] Move the two upper sub-cells (cell 3 and cell 4) to the top of the cell (ear tab side) by an appropriate distance so that the weld marks of the lower sub-cell ear and the adapter are completely or partially covered by the two upper sub-cells. This ensures that the ear welding positions of the two upper sub-cells can avoid the weld marks of the lower sub-cell ear and the adapter, and then proceed with welding.
[0035] In order to facilitate welding, the multiple positive and negative connection points on the positive electrode adapter plate 5 and the negative electrode adapter plate 6 are located on the same straight line, so that a large-area welding head can be used in conjunction with a glue sticking machine to complete glue sticking and welding at one time, saving welding steps.
[0036] When the battery working environment is not good and desoldering is prone to occur, riveting can be added on the basis of the above welding connection.
[0037] In order to control the size of the welding spot on the welding surface and reduce the area of the adapter, the number of monopolar tab layers of the first battery cell 1, the second battery cell 2, the third battery cell 3, and the fourth battery cell 4 is 35 to 75.
[0038] The battery of the utility model, such as Figure 4The above bare cell and adapter connection structure is adopted, and the welded aggregate cell positive and negative adapters are respectively connected to the positive and negative poles arranged on the top cover of the cell during the production process. Then, the four sub-cells are combined and bundled, and then the lithium-ion battery is made after welding, liquid injection, and chemical conversion to the aluminum shell top cover. Such a battery only needs to use one set of adapters, and the production process is simpler than the existing battery structure, and the volume of the battery can be effectively reduced. In the process of designing the sub-battery, a larger volume can be used to increase the battery capacity and improve production efficiency.
[0039] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A bare cell and adapter connection structure, characterized in that: The invention comprises a first battery cell (1), a second battery cell (2), a third battery cell (3), a fourth battery cell (4), a positive electrode adapter sheet (5) and a negative electrode adapter sheet (6), wherein the positive and negative electrode tabs of the first battery cell (1) and the second battery cell (2) are respectively connected to the positive electrode adapter sheet (5) and the negative electrode adapter sheet (6) to form a first positive electrode (11), a second positive electrode (21), a first negative electrode (12) and a second negative electrode (22), and the first battery cell (1), the second battery cell (2) and the third battery cell ( 3) is staggered with the fourth battery cell (4) and connected to the positive electrode adapter plate (5) and the negative electrode adapter plate (6) to form a third positive electrode (31), a fourth positive electrode (41), a third negative electrode (32), and a fourth negative electrode (42); the first positive electrode (11), the second positive electrode (21), the third positive electrode (31), and the fourth positive electrode (41) do not overlap; and the first negative electrode (12), the second negative electrode (22), the third negative electrode (32), and the fourth negative electrode (42) do not overlap.
2. The bare cell and adapter connection structure according to claim 1, characterized in that: Connecting point protection glue is provided between the first positive electrode (11) and the third positive electrode (31), the second positive electrode (21) and the fourth positive electrode (41), the first negative electrode (12) and the third negative electrode (32), and the second negative electrode (22) and the fourth negative electrode (42).
3. The bare cell and adapter connection structure according to claim 1, characterized in that: A plurality of positive and negative electrode connection points on the positive electrode adapter plate (5) and the negative electrode adapter plate (6) are located on the same straight line.
4. A bare cell and adapter connection structure according to any one of claims 1 to 3, characterized in that: The positive and negative electrode tabs are respectively welded or riveted to the positive electrode adapter plate (5) and the negative electrode adapter plate (6).
5. A bare cell and adapter connection structure according to any one of claims 1 to 3, characterized in that: The number of monopolar tab layers of the first battery cell (1), the second battery cell (2), the third battery cell (3) and the fourth battery cell (4) is 35 to 75.
6. A battery, characterized in that: A bare cell and adapter sheet connection structure as described in any one of claims 1 to 5 is adopted.