A battery module connection plate of a lithium battery pack

Abstract

The application relates to a battery module electric connection plate of a lithium battery pack, which comprises an insulating base plate and a plurality of electric connection sheets arranged in a labyrinth track on the insulating base plate, a plurality of electric connection grooves are arranged between two adjacent electric connection sheets on the insulating base plate, and the plurality of electric connection grooves can correspond to a plurality of arrayed lithium battery top ends; two ends of the electric connection sheet are respectively provided with a positive pole sheet and a negative pole sheet, and the lithium batteries corresponding to the two adjacent electric connection grooves are connected in series through the positive pole sheet and the negative pole sheet at the two ends of the electric connection sheet. The utility model belongs to the technical field of batteries, adopts an integrated electric connection sheet design, completely avoids the risk of falling of welding slag in a welding process, greatly improves safety, fully utilizes space through a labyrinth layout, is beneficial to the miniaturization design of a battery module, and adopts a surface contact mode of the electric connection sheet and a battery pole, so that contact resistance is small, and connection is reliable.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery module connector for a lithium battery pack. Background Technology

[0002] In existing technologies, series connections of lithium battery packs are typically achieved using wire welding. This connection method has the following technical drawbacks: welding slag or metal debris generated during the welding process can easily fall into the battery pack and come into contact with and rub against the lithium battery casing, posing a serious safety hazard; wire connections occupy a large amount of space, which is not conducive to the miniaturization design of battery modules; welding quality is difficult to guarantee, and problems such as incomplete welding and false welding are prone to occur, affecting the reliability of the battery pack; the welding process requires manual operation, resulting in low production efficiency and difficulty in ensuring consistency.

[0003] To address the aforementioned issues, there is an urgent need to develop a new type of battery module connector for lithium battery packs to improve the assembly efficiency, connection reliability, and ease of testing of battery modules. Utility Model Content

[0004] Therefore, it is necessary to provide a battery module connector board for a lithium battery pack, and its specific technical solution is as follows.

[0005] A battery module contact board for a lithium battery pack includes an insulating substrate and a plurality of contact pieces mounted on the insulating substrate in a maze-like pattern. The insulating substrate has a plurality of contact grooves arranged between two adjacent contact pieces, and the plurality of contact grooves can correspond to the top of a plurality of lithium batteries arranged in an array.

[0006] The two ends of the contact plate are respectively provided with a positive electrode contact and a negative electrode contact. The lithium batteries corresponding to two adjacent contact slots are connected in series through the positive electrode contact and the negative electrode contact at both ends of the contact plate.

[0007] Furthermore, a clearance groove is provided on one side of the charging slot to accommodate the explosion-proof valve at the top of the lithium battery.

[0008] Furthermore, the insulating substrate is provided with multiple mounting holes for connection to the lithium battery positioning frame.

[0009] Furthermore, the electrode contact is a Z-shaped thin sheet structure, and one end of the negative electrode contact is bent upward to form a transition connection portion that connects to the positive electrode contact. The negative electrode contact can be attached to the negative end plate at the top of the lithium battery, and the positive electrode contact can be attached to the positive electrode contact post that protrudes from the negative end plate at the top of the lithium battery.

[0010] Furthermore, the insulating substrate has a support portion for supporting the contact plate located between two adjacent contact grooves. The support portion has three positioning holes, and the positive contact plate has three positioning protrusions that are adapted to the positioning holes at one end near the negative contact plate.

[0011] Furthermore, the end of the negative electrode contact is provided with an inspection section that is curved upwards.

[0012] Furthermore, the bottom surface of the inspection section is provided with a groove.

[0013] Furthermore, the inspection section and the groove are located at one corner of the end of the negative electrode contact piece, and the inspection section, the groove and the negative electrode contact piece are integrally stamped and formed.

[0014] Furthermore, the positive and negative electrode contacts are provided with laser welding point holes.

[0015] Furthermore, a positive electrode external contact plate and a negative electrode external contact plate are respectively provided on both sides of one end of the insulating substrate. The inner end of the positive electrode external contact plate is connected to the negative terminal plate of the lithium battery, and the inner end of the negative electrode external contact plate is connected to the positive terminal post of the lithium battery. The outer ends of the positive electrode external contact plate and the negative electrode external contact plate are respectively bent downward to provide a positive electrode external contact plate and a negative electrode external contact plate.

[0016] Compared with existing technologies, this utility model has the following beneficial effects:

[0017] The battery module connector of this utility model adopts an integrated connector design, which completely avoids the risk of welding slag falling during the welding process and greatly improves safety; the maze-like layout makes full use of space and is conducive to the miniaturization design of the battery module; the connector and the battery terminal adopt a surface contact method, with low contact resistance and reliable connection; a special explosion-proof valve clearance groove is provided to ensure that the battery's safe pressure relief function is not affected; an inspection section is set up to facilitate the detection of whether the negative terminal connector is firmly connected to the battery. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional structural view of the battery module connector board of the lithium battery pack of this utility model;

[0020] Figure 2This is a schematic diagram of the structure of the battery module connector board of the lithium battery pack of this utility model after removing one connector piece.

[0021] Figure 3 This is a schematic diagram of the structure of the insulating substrate in this utility model;

[0022] Figure 4 This is an enlarged perspective view of the structure of the junction plate in this utility model;

[0023] Figure 5 This is an enlarged bottom view of the structure of the electrical connector in this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Insulating substrate; 2. Connector piece; 3. Connector groove; 4. Relief groove; 5. Mounting hole; 6. Support part; 7. Positive electrode external connector; 8. Negative electrode external connector; 9. Positive electrode external connector; 10. Negative electrode external connector; 21. Positive electrode connector; 22. Negative electrode connector; 23. Transition connection part; 24. Positioning protrusion; 25. Inspection part; 26. Groove; 27. Laser welding point hole; 100. Lithium battery; 101. Negative end plate; 102. Positive electrode connector post; 103. Explosion-proof valve; 200. Lithium battery positioning frame. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0026] The embodiments of this utility model will be described below based on its overall structure.

[0027] Reference Figures 1-5 As shown, this embodiment provides a battery module contact board for a lithium battery pack, including an insulating substrate 1 and a plurality of contact pieces 2 mounted on the insulating substrate 1 in a maze-like pattern. The insulating substrate 1 is provided with a plurality of contact grooves 3 arranged between two adjacent contact pieces 2, and the plurality of contact grooves 3 can correspond to the top of a plurality of arrayed lithium batteries 100.

[0028] The two ends of the contact plate 2 are respectively provided with a positive electrode contact plate 21 and a negative electrode contact plate 22. The lithium batteries 100 corresponding to two adjacent contact slots 3 are connected in series through the positive electrode contact plate 21 and the negative electrode contact plate 22 at both ends of the contact plate 2.

[0029] In this invention, the insulating substrate 1 is made of flame-retardant PC material, which has good insulation performance and mechanical strength. The contact pieces 2 are arranged in a labyrinthine pattern on the insulating substrate 1, which maximizes the use of space.

[0030] Specifically, refer to Figure 2 As shown, a clearance groove 4 is provided on one side of the junction box 3 to accommodate the explosion-proof valve 103 at the top of the lithium battery 100. In this embodiment, each junction box 3 on the insulating substrate 1 corresponds to the installation position of a lithium battery 100. The clearance groove 4 on one side of the junction box 3 is used to avoid the explosion-proof valve 103 at the top of the lithium battery 100.

[0031] Specifically, refer to Figures 1-3 As shown, the insulating substrate 1 is provided with a plurality of mounting holes 5 for connecting with the lithium battery positioning frame 200, for fixing the insulating substrate 1.

[0032] Specifically, refer to Figures 1-3 As shown, the contact piece 2 has a Z-shaped thin sheet structure. One end of the negative electrode contact piece 22 is bent upwards and has a transition connection portion 23 that connects to the positive electrode contact piece 21. The negative electrode contact piece 22 can be fitted and connected to the negative end plate 101 at the top of the lithium battery 100, and the positive electrode contact piece 21 can be fitted and connected to the positive electrode contact post 102 that protrudes from the negative end plate 101 at the top of the lithium battery 100. The contact piece 2 is made of copper alloy material with good conductivity. The positive electrode contact piece 21, the negative electrode contact piece 22, and the transition connection portion 23 are manufactured by an integral stamping process to ensure the reliability of the connection.

[0033] The transition connection part 23 is a vertical plate structure that is perpendicularly connected to the positive electrode contact 21 and the negative electrode contact 22. The negative electrode contact 22 can extend into the contact groove 3 and connect to the negative terminal plate 101 of the lithium battery 100.

[0034] Specifically, refer to Figure 4 , Figure 5 The insulating substrate 1 has a support portion 6 located between two adjacent contact grooves 3 for supporting the contact piece 2. The positive electrode contact piece 21 is mounted on the support portion 6. The support portion 6 has three positioning holes. The positive electrode contact piece 21 has three positioning protrusions 24 that are adapted to the positioning holes at one end near the negative electrode contact piece 22. These protrusions cooperate with the positioning holes on the support portion 6 to ensure accurate positioning of the contact piece 2.

[0035] Specifically, refer to Figure 4 , Figure 5The negative electrode contact 22 has an upward-curved inspection section 25 at one corner of the negative electrode contact 22. The inspection section 25 can be applied with a tool to apply an upward pulling force to observe whether the negative electrode contact 22 can be easily pried open, so as to intuitively judge the connection status between the negative electrode contact 22 and the negative terminal plate 101 and avoid the risk of poor connection.

[0036] Specifically, refer to Figure 4 , Figure 5 The bottom surface of the inspection section 25 is provided with a hook groove 26. Workers can use a pry bar or fingernail to hook the hook groove 26 and then pry upward to check whether the negative electrode contact 22 is firmly connected to the negative terminal plate 101 of the lithium battery.

[0037] Specifically, refer to Figure 4 , Figure 5 The inspection section 25 and the hook groove 26 are located at one corner of the end of the negative electrode contact 22, and the inspection section 25, the hook groove 26 and the negative electrode contact 22 are integrally stamped and formed. Since a dozen or more contact pieces 2 are needed in a lithium battery pack, mass production can be achieved by integral stamping and forming, resulting in high production efficiency.

[0038] Specifically, refer to Figure 4 , Figure 5 The positive electrode contact 21 and the negative electrode contact 22 are provided with laser welding point holes 27, which are used for automatic positioning when laser welding with the lithium battery 100. The diameter of the laser welding point hole 27 is 0.8mm.

[0039] Specifically, refer to Figure 1 The insulating substrate 1 has a positive electrode external contact plate 7 and a negative electrode external contact plate 8 on both sides of one end. The inner end of the positive electrode external contact plate 7 is connected to the negative terminal plate 101 of the lithium battery 100, and the inner end of the negative electrode external contact plate 8 is connected to the positive terminal post 102 of the lithium battery 100. The outer ends of the positive electrode external contact plate 7 and the negative electrode external contact plate 8 are bent downward to form a positive electrode external contact plate 9 and a negative electrode external contact plate 10, respectively, for connecting to an external circuit board. Moreover, the external circuit board can be arranged vertically. Compared with the horizontal arrangement of the external circuit board, the structure of the entire battery pack is more compact and occupies less space.

[0040] During installation, the junction plate of this invention is first fixed to the support part 6 via the positioning protrusions 24. Then, the entire junction plate is installed on the lithium battery positioning frame 200, so that each junction slot 3 corresponds to one lithium battery 100. The positive electrode contact 21 and negative electrode contact 22 of the junction plate 2 are connected to the positive and negative electrodes of the lithium batteries 100 on both sides of the support part 6 via laser welding, completing the series connection of the battery pack. The negative electrode contact 22 can be checked by using a prying tool or inserting a fingernail into the hook groove 26 of the inspection part 25 to see if it can be hooked upwards, thus verifying whether the negative electrode contact 22 is firmly connected to the negative electrode of the battery cell 100.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The above embodiments only illustrate one or more implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A battery module connector board for a lithium battery pack, characterized in that, It includes an insulating substrate (1) and a plurality of contact plates (2) mounted on the insulating substrate (1) in a maze-like pattern. The insulating substrate (1) is provided with a plurality of contact grooves (3) arranged between two adjacent contact plates (2). The plurality of contact grooves (3) can correspond to the top of a plurality of arrayed lithium batteries (100). The two ends of the contact plate (2) are respectively provided with a positive electrode contact plate (21) and a negative electrode contact plate (22). The lithium batteries (100) corresponding to two adjacent contact slots (3) are connected in series through the positive electrode contact plate (21) and the negative electrode contact plate (22) at both ends of the contact plate (2).

2. The battery module connector board of a lithium battery pack according to claim 1, characterized in that, The wall of the power receiving groove (3) on one side is provided with a relief groove (4) that is adapted to the explosion-proof valve (103) at the top of the lithium battery (100).

3. The battery module connector board of a lithium battery pack according to claim 1, characterized in that, The insulating substrate (1) is provided with a plurality of mounting holes (5) that are connected to the lithium battery positioning frame (200).

4. A battery module connector board for a lithium battery pack according to claim 1, 2, or 3, characterized in that, The electrode contact (2) has a Z-shaped thin sheet structure. One end of the negative electrode contact (22) is bent upward and has a transition connection part (23) that connects to the positive electrode contact (21). The negative electrode contact (22) can be attached to the negative end plate (101) at the top of the lithium battery (100). The positive electrode contact (21) can be attached to the positive electrode contact post (102) that protrudes from the negative end plate (101) at the top of the lithium battery (100).

5. The battery module connector board of a lithium battery pack according to claim 4, characterized in that, The insulating substrate (1) has a support portion (6) between two adjacent electrical contact grooves (3) for supporting the electrical contact piece (2). The support portion (6) has three positioning holes. The positive electrode contact piece (21) has three positioning protrusions (24) that are adapted to the positioning holes at one end near the negative electrode contact piece (22).

6. The battery module connector board of a lithium battery pack according to claim 4, characterized in that, The negative electrode contact (22) has an inspection section (25) that is tilted upwards at its end.

7. The battery module connector board of a lithium battery pack according to claim 6, characterized in that, The bottom surface of the inspection section (25) is provided with a groove (26).

8. The battery module connector board of a lithium battery pack according to claim 7, characterized in that, The inspection section (25) and the groove (26) are located at one corner of the end of the negative electrode contact (22), and the inspection section (25), the groove (26) and the negative electrode contact (22) are integrally stamped structures.

9. The battery module connector board of a lithium battery pack according to claim 1, characterized in that, The positive electrode contact (21) and negative electrode contact (22) are provided with laser welding point holes (27).

10. The battery module connector board of a lithium battery pack according to claim 1, characterized in that, The insulating substrate (1) has a positive electrode external contact plate (7) and a negative electrode external contact plate (8) on both sides of one end. The inner end of the positive electrode external contact plate (7) is connected to the negative terminal plate (101) of the lithium battery (100), and the inner end of the negative electrode external contact plate (8) is connected to the positive electrode terminal (102) of the lithium battery (100). The outer ends of the positive electrode external contact plate (7) and the negative electrode external contact plate (8) are respectively bent downward to provide a positive electrode external contact plate (9) and a negative electrode external contact plate (10).

Images