Internal connecting device of battery assembly

Abstract

The utility model discloses an internal connecting device of a battery assembly. The internal connecting device comprises a positive electrode copper bar, a negative electrode copper bar, a positive electrode lug fixing block combination, a negative electrode lug fixing block combination and a series-parallel conversion piece, an L-shaped copper bar insertion rod is arranged on the positive electrode copper bar; the positive tab fixing block combination comprises a first positive tab fixing block, a second positive tab fixing block and a third positive tab fixing block; the negative tab fixing block combination comprises a first negative tab fixing block, a second negative tab fixing block and a third negative tab fixing block; the negative pole copper bar horizontally extends to the outer side below the third negative pole lug fixing block below the position between the first negative pole lug fixing block and the second positive pole lug fixing block; and the series-parallel connection conversion piece is arranged on the sliding rail. According to the utility model, the tabs can be fixedly mounted after being inserted into the tab mounting stations, the tabs with most thicknesses are used, the mounting and the dismounting are convenient, the series-parallel connection switching can be carried out through the series-parallel connection switching piece, and the function is stronger.

Description

Technical Field

[0001] This utility model relates to the technical field of battery module tab connection components, and in particular to an internal connection device for a battery module. Background Technology

[0002] Many battery packs contain multiple parallel battery cells, but the series and parallel connection of the battery tabs can only be chosen in one way and cannot be changed later unless the circuit copper busbars are replaced, which is too costly. For high-power power supplies requiring lithium batteries, multiple lithium batteries must be combined into a battery pack to achieve the requirements of high energy storage and high power. This requires a well-designed mechanism to connect these lithium batteries. Because the current of the battery pack is very large, and the battery pack may be subject to vibration during operation, causing the connections to loosen, the connection between the battery tabs must be reliable with very low contact resistance.

[0003] Conventional lithium battery tab connections use welding, and sometimes bolts or rivets. However, these methods often have the following problems: Welding requires specialized welding equipment, primarily ultrasonic welding. Larger capacity battery packs have many tab layers, sometimes exceeding a hundred layers as capacity increases. This places very high demands on the power of the ultrasonic welding machine, making it difficult to weld tabs with more than 50 layers securely. Furthermore, multi-layered tabs become brittle after ultrasonic welding, easily breaking and rendering the battery pack unusable. Additionally, welding makes it difficult to lead out wires for voltage measurement, and if one battery fails, it cannot be disassembled and the entire pack must be replaced. Bolts or rivets involve drilling holes in multiple tabs together and then locking them in place. This connection method is cumbersome, prone to short circuits, and difficult to insulate. Utility Model Content

[0004] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to provide an internal connection device for a battery assembly that solves problems such as easy loosening, short circuits, and inability to switch between series and parallel connections using conventional connections.

[0005] According to the present invention, an internal connection device for a battery assembly includes a positive copper busbar, a negative copper busbar, a positive tab fixing block assembly, a negative tab fixing block assembly, and a series-parallel conversion component.

[0006] The positive electrode copper busbar is provided with a plurality of equally spaced square through holes, each square through hole is inserted with an L-shaped copper busbar insert rod, and each square through hole position on the positive electrode copper busbar is provided with a bolt hole.

[0007] The positive electrode fixing block assembly includes a first positive electrode fixing block, a second positive electrode fixing block, and a third positive electrode fixing block. The negative electrode fixing block assembly includes a first negative electrode fixing block, a second negative electrode fixing block, and a third negative electrode fixing block. The first positive electrode fixing block and the first negative electrode fixing block form one group, the second positive electrode fixing block and the second negative electrode fixing block form one group, and the third positive electrode fixing block and the third negative electrode fixing block form one group, and are arranged in a row in sequence. Each electrode fixing block on the positive electrode fixing block assembly and the negative electrode fixing block assembly is provided with an electrode installation station. The first positive electrode fixing block, the second positive electrode fixing block, and the third positive electrode fixing block are all provided with a square insertion hole on the side facing the positive electrode copper busbar, and the square insertion hole is also provided with a bolt hole.

[0008] The negative electrode copper busbar extends horizontally below the position between the first negative electrode fixing block and the second positive electrode fixing block to the outer side below the third negative electrode fixing block. An insulating block is fixed below the second positive electrode fixing block, the third positive electrode fixing block, the second negative electrode fixing block, and the third negative electrode fixing block to separate them from the negative electrode copper busbar.

[0009] Slide rails are provided below the positions between the first negative electrode fixing block and the second positive electrode fixing block, and between the second negative electrode fixing block and the third positive electrode fixing block. The slide rails are provided with sliding grooves. A sliding rod is fixed below the middle position of the series-parallel conversion component. The bottom end of the sliding rod is slidably disposed in the sliding groove. When the series-parallel conversion component is pushed backward, it can connect the first negative electrode fixing block and the second positive electrode fixing block, as well as the second negative electrode fixing block and the third positive electrode fixing block. When the series-parallel conversion component is pushed forward, it can connect both the first negative electrode fixing block and the second negative electrode fixing block to the negative copper busbar. The third negative electrode fixing block is always connected to the negative copper busbar.

[0010] During installation, the first L-shaped copper busbar will always be connected to the insertion square hole of the first positive electrode fixing block. All subsequent L-shaped copper busbars will only be connected to the corresponding insertion square holes when the series-parallel conversion component is pushed forward and both the first negative electrode fixing block and the second positive electrode fixing block are connected to the negative copper busbar.

[0011] In some embodiments of this utility model, the electrode mounting station includes a square notch facing inward, a sidewall notch is provided on one side wall of the square notch, a rotating bolt is provided in the sidewall notch, and a pressure plate is fitted on the rotating bolt.

[0012] In some other embodiments of this utility model, the first negative electrode fixing block and the second negative electrode fixing block have the same structure. The upper left half of the first negative electrode fixing block and the second negative electrode fixing block are provided with an electrode installation station, and the two corner positions of the right half are provided with a first square slot and a second square slot. The upper left half of the third negative electrode fixing block is provided with an electrode installation station, and the rear corner of the right half is provided with a third square slot.

[0013] The second positive electrode fixing block and the third positive electrode fixing block have the same structure. The upper right half of the second positive electrode fixing block and the third positive electrode fixing block are provided with an electrode installation station, and the front corner of the left half is provided with a fourth square slot.

[0014] The top view of the series-parallel conversion component is an I-shaped component. The two front feet of the series-parallel conversion component are the first feet, the left rear foot is the second foot, and the right rear foot is the third foot. The third foot is lowered and below the lower surface of the I-shaped component, and the length of the third foot is half that of the second foot.

[0015] In some other embodiments of this utility model, the positive electrode fixing block assembly and the negative electrode fixing block assembly can be provided with no less than three sets of positive electrode fixing blocks and negative electrode fixing blocks as needed.

[0016] In this invention, the electrode tab can be fixedly installed by inserting it into the electrode tab installation station. It is applicable to electrode tabs of most thicknesses, is easy to install and disassemble, and can also be switched between series and parallel through a series-parallel conversion component, making it more functional. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram (explosion state) of the internal connection device of a battery assembly proposed in this utility model.

[0019] Figure 2 This is a schematic diagram of the internal connection device of a battery assembly (in series) proposed in this utility model.

[0020] Figure 3 This is a schematic diagram of the internal connection device of a battery assembly proposed in this utility model (parallel connection).

[0021] Figure 4 This is a schematic diagram of the structure of the first positive electrode fixing block proposed in this utility model.

[0022] Figure 5 This is a schematic diagram of the structure of the first negative electrode ear fixing block proposed in this utility model.

[0023] Figure 6 This is a schematic diagram of the structure of the second positive electrode fixing block proposed in this utility model.

[0024] Figure 7 This is a schematic diagram of the structure of the third negative electrode fixing block proposed in this utility model.

[0025] Figure 8 This is a schematic diagram of the series-parallel conversion component proposed in this utility model.

[0026] In the diagram: 1. Positive copper busbar; 11. L-shaped copper busbar insert; 2. Negative copper busbar; 3. First positive electrode lug fixing block; 31. Insertion square hole; 4. First negative electrode lug fixing block; 5. Second positive electrode lug fixing block; 6. Third negative electrode lug fixing block; 7. Slide rail; 8. Series-parallel conversion component; 80. Slide rod; 81. First foot; 82. Second foot; 83. Third foot; 9. Electrode installation position; 91. Square notch; 92. Pressing plate; 93. Rotating bolt. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] Reference Figure 1-8 An internal connection device for a battery assembly includes a positive copper busbar 1, a negative copper busbar 2, a positive tab fixing block assembly, a negative tab fixing block assembly, and a series-parallel conversion component 8;

[0030] The positive electrode copper busbar 1 is provided with a plurality of equally spaced square through holes, and an L-shaped copper busbar insert rod 11 is inserted into each square through hole. Each positive electrode copper busbar at each of the square through holes is provided with a bolt hole.

[0031] The positive electrode fixing block assembly includes a first positive electrode fixing block 3, a second positive electrode fixing block 5, and a third positive electrode fixing block. The negative electrode fixing block assembly includes a first negative electrode fixing block 4, a second negative electrode fixing block, and a third negative electrode fixing block 6. The first positive electrode fixing block 3 and the first negative electrode fixing block 4 form a group, the second positive electrode fixing block 5 and the second negative electrode fixing block form a group, and the third positive electrode fixing block and the third negative electrode fixing block form a group, and are arranged in a row in sequence. Each electrode fixing block in the positive electrode fixing block assembly and the negative electrode fixing block assembly is provided with an electrode installation station 9. The first positive electrode fixing block 3, the second positive electrode fixing block 5, and the third positive electrode fixing block are all provided with a square insertion hole 31 on the side facing the positive electrode copper busbar 1, and the square insertion hole 31 is also provided with a bolt hole.

[0032] The negative electrode copper busbar 2 extends horizontally below the position between the first negative electrode ear fixing block 4 and the second positive electrode ear fixing block 5 to the outer side below the third negative electrode ear fixing block 6. An insulating block is fixed below the second positive electrode ear fixing block 5, the third positive electrode ear fixing block, the second negative electrode ear fixing block, and the third negative electrode ear fixing block 6 to separate them from the negative electrode copper busbar 2.

[0033] A slide rail 7 is provided below the positions between the first negative electrode fixing block 4 and the second positive electrode fixing block 5, and between the second negative electrode fixing block and the third positive electrode fixing block. The slide rail 7 is provided with a sliding groove. A slide rod 80 is fixed below the middle position of the series-parallel conversion component 8. The bottom end of the slide rod 80 is slidably disposed in the sliding groove. When the series-parallel conversion component 8 is pushed backward, it can connect the first negative electrode fixing block 4 and the second positive electrode fixing block 5, and the second negative electrode fixing block and the third positive electrode fixing block. When the series-parallel conversion component 8 is pushed forward, it can connect both the first negative electrode fixing block 4 and the second negative electrode fixing block to the negative electrode copper busbar 2. The third negative electrode fixing block 6 is always connected to the negative electrode copper busbar 2.

[0034] During installation, the first L-shaped copper busbar plug 11 will always be connected to the insertion square hole 31 of the first positive electrode fixing block 3. All subsequent L-shaped copper busbar plugs 11 will only be connected to the corresponding insertion square hole 31 when the series-parallel conversion component 8 is pushed forward and both the first negative electrode fixing block 4 and the second positive electrode fixing block 5 are connected to the negative electrode copper busbar 2.

[0035] First, based on the size of the lithium battery block (both the positive and negative tabs are on the same side), arrange the positive tab fixing block assembly, the negative tab fixing block assembly, and the series-parallel conversion component 8 (in order and according to the required spacing). Then, install the battery block to the workstation, and insert the tabs of the battery block into the corresponding positive tab fixing block or negative tab fixing block (fixed by the tab installation workstation 9). After installation, select series or parallel connection as needed.

[0036] like Figure 2 To achieve series connection, the two series-parallel conversion components 8 are pulled back, connecting the first negative electrode fixing block 4 with the second positive electrode fixing block 5, and connecting the second negative electrode fixing block with the third positive electrode fixing block. This allows the first positive electrode fixing block 3, the second positive electrode fixing block 5, the third positive electrode fixing block, the first negative electrode fixing block 4, the second negative electrode fixing block, and the third negative electrode fixing block 6 to be connected in series with the battery block.

[0037] like Figure 3 To achieve parallel connection, the series-parallel conversion component 8 is pushed forward. One foot of the series-parallel conversion component 8 is connected to the negative electrode ear fixing block, and the other foot is attached to the negative electrode copper busbar 2. The foot of the negative electrode copper busbar 2 is then fixed with bolts. In this way, the negative terminals of all battery blocks are connected to the negative electrode copper busbar 2, and the L-shaped copper busbar plugs 11 are all connected to the plug square holes 31, ultimately forming a parallel connection.

[0038] The electrode mounting station 9 includes a square notch 91 facing inward. One side wall of the square notch 91 has a side wall notch, and a rotating bolt 93 is installed inside the side wall notch. A pressure plate 92 is fitted onto the rotating bolt 93. The battery electrode is first inserted into the square notch 91. The pressure plate 92 is then rotated into the square notch 91. By rotating the rotating bolt 93, the pressure plate 92 presses down on the electrode.

[0039] The first negative electrode fixing block 4 and the second negative electrode fixing block have the same structure. The upper left half of the first negative electrode fixing block 4 and the second negative electrode fixing block are provided with electrode installation station 9, and the two corner positions of the right half are provided with first square slot 41 and second square slot 42. The upper left half of the third negative electrode fixing block 6 is provided with electrode installation station 9, and the rear corner of the right half is provided with third square slot 61.

[0040] The second positive electrode fixing block 5 and the third positive electrode fixing block have the same structure. The upper right half of the second positive electrode fixing block 5 and the third positive electrode fixing block are provided with an electrode installation station 9, and the front corner of the left half is provided with a fourth square slot.

[0041] The series-parallel conversion component 8 is an I-shaped component in top view. The two front feet of the series-parallel conversion component 8 are the first foot 81, the left rear foot is the second foot 82, and the right rear foot is the third foot 83. The third foot is lowered and below the lower surface of the I-shaped component, and the length of the third foot 83 is half that of the second foot 82.

[0042] The first pin 81 on the left is used to lock into the first square slot 41, and the first pin 81 on the right is used to lock into the fourth square slot. This is a series connection.

[0043] The second pin 82 is inserted into the second square slot 42, while the third pin 83 is attached to the negative copper busbar 2 and fixed with bolts. At this time, it is connected in parallel.

[0044] The positive electrode fixing block assembly and the negative electrode fixing block assembly can be configured with no fewer than three sets of positive electrode fixing blocks and negative electrode fixing blocks as needed. More than three sets can be configured as needed. Figure 1-3 The three groups shown can be expanded to include more groups.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An internal connection device for a battery assembly, characterized in that: It includes a positive copper busbar (1), a negative copper busbar (2), a positive tab fixing block assembly, a negative tab fixing block assembly, and a series-parallel conversion component (8). The positive electrode copper busbar (1) is provided with a plurality of equally spaced square through holes, and an L-shaped copper busbar insert (11) is inserted into each square through hole. Each positive electrode copper busbar at the position of the square through hole is provided with a bolt hole. The positive electrode fixing block assembly includes a first positive electrode fixing block (3), a second positive electrode fixing block (5) and a third positive electrode fixing block. The negative electrode fixing block assembly includes a first negative electrode fixing block (4), a second negative electrode fixing block and a third negative electrode fixing block (6). The first positive electrode fixing block (3) and the first negative electrode fixing block (4) are a group, the second positive electrode fixing block (5) and the second negative electrode fixing block are a group, and the third positive electrode fixing block and the third negative electrode fixing block (6) are a group and are arranged in a row in sequence. Each electrode fixing block on the positive electrode fixing block assembly and the negative electrode fixing block assembly is provided with an electrode installation station (9). The first positive electrode fixing block (3), the second positive electrode fixing block (5) and the third positive electrode fixing block are all provided with a square hole (31) on the side facing the positive electrode copper busbar (1) and a bolt hole is also provided at the position of the square hole (31). The negative electrode copper busbar (2) extends horizontally below the position between the first negative electrode ear fixing block (4) and the second positive electrode ear fixing block (5) to the outside of the third negative electrode ear fixing block (6). An insulating block is fixed below the second positive electrode ear fixing block (5), the third positive electrode ear fixing block, the second negative electrode ear fixing block and the third negative electrode ear fixing block (6) to separate them from the negative electrode copper busbar (2). A slide rail (7) is provided below the position between the first negative electrode fixing block (4) and the second positive electrode fixing block (5) and the position between the second negative electrode fixing block and the third positive electrode fixing block. The slide rail (7) is provided with a sliding groove. A slide rod (80) is fixed below the middle position of the series-parallel conversion component (8). The bottom end of the slide rod (80) is slidably disposed in the sliding groove. When the series-parallel conversion component (8) is pushed backward, it can connect the first negative electrode fixing block (4) with the second positive electrode fixing block (5) and the second negative electrode fixing block with the third positive electrode fixing block. When the series-parallel conversion component (8) is pushed forward, it can connect the first negative electrode fixing block (4) and the second negative electrode fixing block with the negative electrode copper busbar (2). The third negative electrode fixing block (6) is always connected with the negative electrode copper busbar (2). The first L-shaped copper busbar plug (11) will always be connected to the insertion square hole (31) of the first positive electrode fixing block (3) during installation. All subsequent L-shaped copper busbar plugs (11) will only be connected to the corresponding insertion square hole (31) when the series-parallel conversion component (8) is pushed forward and the first negative electrode fixing block (4) and the second positive electrode fixing block (5) are connected to the negative electrode copper busbar (2).

2. The internal connection device of a battery assembly according to claim 1, characterized in that: The electrode installation station (9) includes a square notch (91) facing inward. One side wall of the square notch (91) is provided with a side wall notch. A rotating bolt (93) is provided in the side wall notch. A pressure plate (92) is fitted on the rotating bolt (93).

3. The internal connection device of a battery assembly according to claim 1, characterized in that: The first negative electrode fixing block (4) and the second negative electrode fixing block have the same structure. The upper left half of the first negative electrode fixing block (4) and the second negative electrode fixing block are provided with an electrode installation station (9) and the two corners of the right half are provided with a first square slot (41) and a second square slot (42). The upper left half of the third negative electrode fixing block (6) is provided with an electrode installation station (9) and the rear corner of the right half is provided with a third square slot (61). The second positive electrode fixing block (5) and the third positive electrode fixing block have the same structure. The upper right half of the second positive electrode fixing block (5) and the third positive electrode fixing block are provided with an electrode installation station (9) and the left half of the front corner is provided with a fourth square slot. The top view of the series-parallel conversion component (8) is an I-shaped component. The two front feet of the series-parallel conversion component (8) are the first foot (81), the left rear foot is the second foot (82), and the right rear foot is the third foot (83). The third foot is lowered and is below the lower surface of the I-shaped component. The length of the third foot (83) is half that of the second foot (82).

4. The internal connection device of a battery assembly according to claim 1, characterized in that: The positive electrode fixing block assembly and the negative electrode fixing block assembly can be configured with no less than three sets of positive electrode fixing blocks and negative electrode fixing blocks as needed.

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