Lithium battery convenient to weld

Abstract

The utility model discloses a lithium battery convenient to weld. The lithium battery comprises a battery shell, the battery module is arranged in the battery shell, the battery module comprises a plurality of groups of lithium battery cells, and the plurality of groups of lithium battery cells are sequentially connected in series, so that the plurality of groups of lithium battery cells are grouped outside the battery shell and are connected in series, that is, two adjacent groups of lithium battery cells are electrically connected through a connecting piece; a plurality of battery cell groups arranged side by side are formed, a binding piece is arranged on the outer surface of each battery cell group to ensure the structural stability of the battery cell group, then, the adjacent battery cell groups are electrically connected through a connecting row, and after all welding work is completed, the whole battery module is put into a battery shell as a whole. Compared with the operation in a narrow and closed battery shell, the movable range is large, the operation difficulty is greatly reduced, the welding of the connecting piece and the pole is more accurate and efficient, and the probability of occurrence of welding defects such as insufficient welding and welding skips is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery technology, and in particular to a lithium battery that is easy to weld. Background Technology

[0002] The cell module is the most important component of a battery. It is an intermediate energy storage unit between the individual cell and the battery. Traditionally, lithium-ion cells are welded after they are placed inside the battery casing. Although this method is common, it may encounter some challenges during operation. For example, the heat generated during welding may affect other components inside the battery casing, and welding operations in a confined space are difficult. Therefore, a lithium-ion battery that is easy to weld is needed to solve this problem. Utility Model Content

[0003] This utility model addresses the shortcomings of existing technologies by providing the following technical solution:

[0004] A lithium battery that is easy to weld includes:

[0005] Battery casing;

[0006] A battery module is disposed inside the battery casing. The battery module includes multiple sets of lithium battery cells connected in series. The multiple sets of lithium battery cells are arranged in groups to form multiple battery cell groups arranged side by side. A binding member is provided on the outer surface of the battery cell group. Adjacent sets of lithium battery cells are electrically connected through connecting pieces. Adjacent sets of battery cell groups are electrically connected through connecting channels.

[0007] As an improvement to the above technical solution, the lithium battery cell located at the beginning of the battery module is defined as the first battery cell, and the battery cell located at the end of the battery module is defined as the second battery cell. Both the positive terminal of the first battery cell and the negative terminal of the second battery cell are electrically connected to a busbar, which is used to connect the battery module to an external device.

[0008] As an improvement to the above technical solution, the busbar has a Z-shaped structure.

[0009] As an improvement to the above technical solution, alignment holes are formed on the connecting piece to align with the terminals of the lithium battery cell.

[0010] As an improvement to the above technical solution, the electrodes of two adjacent battery cell groups on the same side have opposite electrical properties, and the electrodes connecting two adjacent lithium battery cells have opposite electrical properties.

[0011] As an improvement to the above technical solution, the connecting piece is electrically connected to a connector.

[0012] The beneficial effects of this utility model are:

[0013] By first grouping and connecting multiple sets of lithium-ion cells in series outside the battery casing, that is, by electrically connecting adjacent sets of lithium-ion cells with connecting tabs, multiple cell groups are formed side by side. Each cell group has a restraint on its outer surface to ensure its structural stability. Then, the electrical connection between adjacent cell groups is achieved through connecting strips. After all welding work is completed, the entire battery module is placed into the battery casing as a whole. Compared with operating in the small and closed battery casing, the field of vision is not restricted and the range of movement is large, which greatly reduces the difficulty of operation. It makes the welding of connecting tabs and terminals more precise and efficient, and effectively reduces the probability of welding defects such as cold solder joints and missing solder joints. Attached Figure Description

[0014] Figure 1 This is a front view of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the battery module of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the battery cell assembly of this utility model. Reference numerals: 10, battery casing; 20, battery module; 21, battery cell; 22, connecting piece; 23, alignment hole; 24, connector; 25, restraining member; 26, connecting bar; 27, busbar. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0018] A lithium battery that is easy to weld includes:

[0019] Battery casing 10;

[0020] A battery module 20 is disposed inside the battery casing 10. The battery module 20 includes multiple sets of lithium battery cells 21 connected in series. The multiple sets of lithium battery cells 21 are arranged in groups to form multiple battery cell groups arranged side by side. A binding member 25 is provided on the outer surface of the battery cell group. Adjacent sets of lithium battery cells 21 are electrically connected by a connecting piece 22. Adjacent sets of battery cell groups are electrically connected by a connecting strip 26.

[0021] Multiple groups of lithium-ion cells 21 are first grouped and connected in series outside the battery casing 10, that is, adjacent groups of lithium-ion cells 21 are electrically connected by connecting pieces 22 to form multiple cell groups arranged side by side. Each cell group has a restraining member 25 on its outer surface to ensure its structural stability. Subsequently, adjacent cell groups are electrically connected by connecting strips 26 and connected in series. After all welding work is completed, the entire battery module 20 is placed into the battery casing 10 as a whole. Compared with operating in the small and closed battery casing, the field of vision is unrestricted, the range of motion is large, and the operation difficulty is greatly reduced. The welding of the connecting piece 22 to the terminal post is more precise and efficient, effectively reducing the probability of welding defects such as incomplete welding and missing welding, and building a reliable electrical connection foundation for the cell module. During the welding module stage, the restraint piece 25 can stabilize the lithium cell 21 in the cell group, preventing the lithium cell 21 from shifting position due to vibration and other factors during the welding process, ensuring that the connecting piece 22 can always be tightly attached to the terminal post, and guaranteeing the welding quality. On the other hand, in the subsequent PACK assembly process, when multiple lithium cells 21 are integrated, the restraint piece 25 can maintain the integrity of the cell group, making it easier to install into the battery case 10, improving the efficiency and safety of PACK assembly.

[0022] In one embodiment, the first lithium-ion cell 21 in the battery module 20 is defined as the first cell, and the last cell in the battery module 20 is defined as the second cell. Both the positive terminal of the first cell and the negative terminal of the second cell are electrically connected to a busbar 27. The busbar 27 is used to connect the battery module 20 to external devices. As an interface, the busbar 27 can transmit electrical energy accurately and stably. On the one hand, compared to drawing connection lines from each cell separately, the busbar 27 simplifies the connection structure, reduces line resistance loss, and improves power transmission efficiency. On the other hand, its centralized connection method facilitates quick positioning and connection of external lines during PACK assembly, reduces assembly difficulty, improves the integration level of the entire system, and further ensures the continuity and efficiency of assembly from the battery module to the PACK.

[0023] In one embodiment, the busbar 27 has a Z-shaped structure. The Z-shaped structure allows the busbar 27 to be installed at different heights within a limited space, thereby making more effective use of the internal space of the battery module and achieving flexible layout in the vertical direction. This avoids occupying too much planar space due to line interference and does not cause space obstruction to other components that are being installed or have already been installed, making the layout of the entire battery module more reasonable and orderly, and further optimizing the assembly process of the battery module.

[0024] In one embodiment, the connecting piece 22 has an alignment hole 23 that aligns with the terminal post of the lithium battery cell 21, which facilitates alignment when the connecting piece 22 is welded to the terminal post and improves the accuracy of the overall assembly.

[0025] In one embodiment, the electrodes of two adjacent cell groups on the same side have opposite electrical properties, which ensures that each adjacent cell group is connected in series, thereby achieving a high energy density of the overall battery module 10. The electrodes of two adjacent lithium cells 21 connected to each other have opposite electrical properties, which ensures that each adjacent lithium cell 21 is connected in series, thereby achieving a high energy density of the overall cell group.

[0026] In one embodiment, the connecting piece 22 is electrically connected to a connector 24, through which the voltage of a single lithium battery cell 21 can be collected.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it.

Claims

1. A lithium battery that is easy to weld, characterized in that, include: Battery casing (10); A battery module (20) is disposed inside the battery casing (10). The battery module (20) includes multiple sets of lithium battery cells (21) and the multiple sets of lithium battery cells (21) are connected in series. The multiple sets of lithium battery cells (21) are arranged in groups to form multiple battery cell groups arranged side by side. A binding member (25) is provided on the outer surface of the battery cell group. Two adjacent sets of lithium battery cells (21) are electrically connected through a connecting piece (22). Two adjacent sets of battery cell groups are electrically connected through a connecting strip (26).

2. The lithium battery that is easy to weld according to claim 1, characterized in that: The first lithium battery cell (21) in the battery module (20) is defined as the first battery cell, and the last battery cell in the battery module (20) is defined as the second battery cell. Both the positive terminal of the first battery cell and the negative terminal of the second battery cell are electrically connected to a busbar (27). The busbar (27) is used to connect the battery module (20) to an external device.

3. A lithium battery that is easy to weld according to claim 2, characterized in that: The busbar (27) has a Z-shaped structure.

4. A lithium battery that is easy to weld according to claim 1, characterized in that: The connecting piece (22) has an alignment hole (23) that aligns with the electrode post of the lithium battery cell (21).

5. A lithium battery that is easy to weld according to claim 1, characterized in that: The electrodes of two adjacent battery cells on the same side have opposite electrical properties, and the electrodes connected between two adjacent lithium battery cells (21) have opposite electrical properties.

6. A lithium battery that is easy to weld according to claim 1, characterized in that: The connecting piece (22) is electrically connected to a connector (24).

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