Battery module structure of lithium battery pack

Abstract

The utility model relates to a battery module structure of a lithium battery pack, comprising: a plurality of battery cells arranged in an array; a plurality of positioning through holes matched with the tops of the battery cells are formed in the positioning frame; the signal acquisition board is mounted on the top surface of the positioning frame, a plurality of power connection grooves are formed in the signal acquisition board, and a signal acquisition power connection part is arranged on the signal acquisition board and located between every two adjacent power connection grooves; the series circuit comprises a plurality of power connection sheets which are used for connecting two battery cells corresponding to two adjacent power connection slots in series; and the battery protection circuit board is vertically arranged on the side surface of the positioning frame. The utility model belongs to the technical field of batteries, adopts an integrated power connection sheet design, completely avoids the risk of welding slag falling in the welding process, and greatly improves the safety; and the labyrinth type layout makes full use of the space, which is beneficial to the miniaturization design of the battery module.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery module structure 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 novel battery module structure for lithium battery packs to improve assembly efficiency, connection reliability, and ease of testing. Utility Model Content

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

[0005] A battery module structure for a lithium battery pack includes:

[0006] Battery cells, multiple battery cell arrays arranged;

[0007] A positioning frame, wherein the positioning frame is provided with a plurality of positioning through holes adapted to the top of the battery cell;

[0008] A signal acquisition board is installed on the top surface of the positioning frame. The signal acquisition board is provided with multiple power receiving slots corresponding to the top of the battery cells in the positioning through holes. A signal acquisition power receiving part is provided on the signal acquisition board between two adjacent power receiving slots.

[0009] A series circuit, the series circuit including a plurality of contact pieces installed on each signal acquisition contact part of the signal acquisition board, which can connect the two cells corresponding to two adjacent contact slots in series.

[0010] A battery protection circuit board is vertically mounted on the side of the positioning frame. The top two sides of the battery protection circuit board are respectively provided with a positive terminal interface and a negative terminal interface that are electrically connected to the positive and negative terminals of the series circuit. The middle of the top of the battery protection circuit board is provided with a signal acquisition interface that can be electrically connected to the signal acquisition junction via a wire.

[0011] Furthermore, the positioning frame has a protruding positioning terminal on its side, and the positioning terminal has a screw hole. The battery protection circuit board has a first mounting hole corresponding to the screw hole of the positioning terminal. The signal acquisition board has a plurality of second mounting holes that connect to the positioning frame.

[0012] Furthermore, the signal acquisition board has a positive electrode external connector and a negative electrode external connector on both sides of one end. The two ends of the positive electrode external connector are connected to the positive electrode interface and the negative terminal plate of the battery cell, respectively. The two ends of the negative electrode external connector are connected to the negative electrode interface and the positive electrode terminal of the battery cell, respectively.

[0013] Furthermore, a clearance groove is provided on one side of the electrical connection groove to accommodate the explosion-proof valve at the top of the battery cell.

[0014] Furthermore, the contact piece has a Z-shaped thin sheet structure, with a positive electrode contact piece and a negative electrode contact piece at each end. One end of the negative electrode contact piece is bent upward to form a transition connection portion that connects to the positive electrode contact piece. The negative electrode contact piece can be attached to the negative end plate at the top of the battery cell, and the positive electrode contact piece can be attached to the positive electrode contact post that protrudes from the negative end plate at the top of the battery cell.

[0015] Furthermore, the signal acquisition contact part is provided with three pinholes, and the positive terminal contact near the negative terminal contact is provided with three positioning protrusions that are adapted to the pinholes.

[0016] Furthermore, the end of the negative electrode contact is provided with an inspection section that is curved upwards.

[0017] Furthermore, the bottom surface of the inspection section is provided with a groove.

[0018] 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.

[0019] Furthermore, the positive and negative electrode contacts are provided with laser welding point holes.

[0020] Compared with existing technologies, this utility model has the following beneficial effects:

[0021] The battery module structure of this utility model's lithium battery pack uses an integrated contact plate to connect each battery cell in series. The contact plate is fixed to the top of the cell by laser welding, completely avoiding the problem of weld slag falling off in traditional welding, greatly improving safety. The labyrinth-style contact plate connects the arrayed cells in series, making full use of space and facilitating the miniaturization design of the battery module. The contact plate and the battery terminal adopt a surface contact method, resulting in 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 contact plate is firmly connected to the battery. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a three-dimensional structural view of the battery module structure of the lithium battery pack of this utility model;

[0024] Figure 2 This is a structural front view of the battery module structure of the lithium battery pack of this utility model;

[0025] Figure 3 This is a top view of the battery module structure of the lithium battery pack of this utility model;

[0026] Figure 4 This is a three-dimensional structural view of the combination of signal acquisition board, connector, battery cell and positioning frame in this utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the signal acquisition board, the contact plate, the battery cell and the positioning frame in this utility model after removing one contact plate;

[0028] Figure 6 This is a schematic diagram of the signal acquisition board in this utility model;

[0029] Figure 7 This is an enlarged perspective view of the structure of the junction plate in this utility model;

[0030] Figure 8 This is an enlarged bottom view of the structure of the electrical connector in this utility model.

[0031] Explanation of reference numerals in the attached drawings: 1. Signal acquisition board; 2. Connector piece; 3. Connector slot; 4. Clearance slot; 5. Second mounting hole; 6. Signal acquisition connector; 7. Positive external connector piece; 8. Negative external connector piece; 9. Positive external connector piece; 10. Negative external connector piece; 21. Positive connector piece; 22. Negative connector piece; 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 connector post; 103. Explosion-proof valve; 200. Positioning frame; 201. Positioning through hole; 202. Support column; 203. Positioning terminal; 300. Battery protection circuit board; 301. Positive interface; 302. Negative interface; 303. Signal acquisition interface; 304. First mounting hole. Detailed Implementation

[0032] 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.

[0033] The embodiments of this utility model will be described below based on its overall structure.

[0034] Reference Figures 1-8 As shown, this embodiment provides a battery module structure for a lithium battery pack, including:

[0035] 100 cells, multiple 100 cells arranged in an array;

[0036] Positioning frame 200 is used to position the battery cell 100 so that multiple battery cells 100 are arranged neatly. The positioning frame 200 is provided with multiple positioning through holes 201 that are adapted to the top of the battery cell 100. The bottom of the positioning frame 200 is provided with a support column 202 that is connected to the outer shell.

[0037] The signal acquisition board 1 is installed on the top surface of the positioning frame 200. The signal acquisition board 1 is provided with a plurality of power receiving slots 3 corresponding to the top of the battery cell 100 in the positioning through hole 201. The signal acquisition power receiving part 6 is provided between two adjacent power receiving slots 3. The signal acquisition board 1 is a PCB board. The acquisition lines that are electrically connected to each signal acquisition power receiving part 6 are obtained by etching process. The end of the acquisition line is connected to the FC ribbon cable.

[0038] A series circuit is used to connect each battery cell 100 in series. The series circuit includes a plurality of contact pieces 2 installed on each signal acquisition contact part 6 of the signal acquisition board 1, which can connect two battery cells 100 corresponding to two adjacent contact slots 3 in series.

[0039] The battery protection circuit board 300 is used to process data such as voltage and temperature of the battery cell 100 collected by the signal acquisition board 1, and also to perform charging and discharging rectification of the series circuit of the battery cell 100. The battery protection circuit board 300 is vertically arranged and installed on the side of the positioning frame 200. The top two sides of the battery protection circuit board 300 are respectively provided with a positive terminal interface 301 and a negative terminal interface 302 that are electrically connected to the positive and negative terminals of the series circuit. The middle of the top of the battery protection circuit board 300 is provided with a signal acquisition interface 303 that can be electrically connected to the signal acquisition junction 6 through a wire. The signal acquisition interface 303 is electrically connected to the FC cable connecting the acquisition line. The bottom two sides of the battery protection circuit board 300 are provided with a positive terminal interface and a negative terminal interface that are connected to an external charging and discharging circuit.

[0040] The battery module structure of this utility model of lithium battery pack is provided with multiple contact plates 2 arranged along a maze-like trajectory to connect multiple battery cells 100 in series. The contact plates 2 are fixed to the top of the battery cells 100 by laser welding, which completely avoids the situation of welding slag falling off in traditional welding and greatly improves safety. The multiple battery cells 100 are arranged in an array by setting a positioning frame 200, which is neat and occupies little space.

[0041] The battery protection circuit board 300 is vertically arranged and installed on the side of the positioning frame 200, which can greatly reduce the lateral space occupied by the battery module and make the whole structure more compact.

[0042] Specifically, refer to Figures 1-3 The positioning frame 200 has a protruding positioning terminal 203 on its side, and the positioning terminal 203 has a screw hole. The battery protection circuit board 300 has a first mounting hole 304 corresponding to the screw hole of the positioning terminal 203. The battery protection circuit board 300 is firmly installed on the side of the positioning frame 200 by bolts. The signal acquisition board 1 has a plurality of second mounting holes 5 connected to the positioning frame 200. The substrate of the signal acquisition board 1 is an insulating structure. The signal acquisition board 1 can be firmly installed on the positioning frame 200 by bolts.

[0043] Specifically, refer to Figures 1-5The signal acquisition board 1 has a positive external connector 7 and a negative external connector 8 on both sides of one end. The positive external connector 7 and the negative external connector 8 are installed on the signal acquisition connection part 6 at the end of the signal acquisition board 1. The two ends of the positive external connector 7 are connected to the positive interface 301 and the negative terminal plate 101 of the battery cell 100, respectively. The two ends of the negative external connector 8 are connected to the negative interface 302 and the positive terminal post 102 of the battery cell 100, respectively.

[0044] Specifically, refer to Figure 4 and Figure 5 The outer ends of the positive electrode external connector 7 and the negative electrode external connector 8 are respectively bent downward to provide a positive electrode external connector 9 and a negative electrode external connector 10. The positive electrode external connector 9 and the negative electrode external connector 10 can be quickly connected to the positive electrode interface 301 and the negative electrode interface 302.

[0045] Specifically, refer to Figure 5 As shown, a clearance groove 4 is provided on one side of the power connection groove 3 to accommodate the explosion-proof valve 103 at the top of the battery cell 100. In this embodiment, each power connection groove 3 on the signal acquisition board 1 corresponds to the installation position of one battery cell 100. The clearance groove 4 on one side of the power connection groove 3 is used to avoid the explosion-proof valve 103 at the top of the battery cell 100.

[0046] Specifically, refer to Figure 7-8 As shown, the contact piece 2 has a Z-shaped thin sheet structure. Both ends of the contact piece 2 are respectively provided with a positive electrode contact piece 21 and a negative electrode contact piece 22. One end of the negative electrode contact piece 22 is bent upwards to form 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 battery cell 100. The positive electrode contact piece 21 can be fitted and connected to the positive electrode contact post 102 protruding from the negative end plate 101 at the top of the battery cell 100. The contact piece 2 is made of a 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 using an integral stamping process to ensure reliable connection. The transition connection portion 23 is a vertical plate structure that is perpendicularly connected to the positive electrode contact piece 21 and the negative electrode contact piece 22. The negative electrode contact piece 22 can extend into the contact groove 3 to connect to the negative end plate 101 of the battery cell 100.

[0047] Specifically, refer to Figure 6-8 The signal acquisition connector 6 has three pinholes, and the positive terminal 21 has three positioning protrusions 24 that match the pinholes at one end near the negative terminal 22. The positioning protrusions 24 cooperate with the pinholes on the signal acquisition connector 6 to ensure accurate positioning of the connector 2.

[0048] In this invention, the signal acquisition board 1 is made of flame-retardant PC material, which has good insulation properties and mechanical strength. The contact plates 2 are arranged in a maze-like pattern on the signal acquisition board 1, which maximizes the use of space.

[0049] Specifically, refer to Figure 6-8 The 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.

[0050] 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.

[0051] 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.

[0052] 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 battery cell 100. The diameter of the laser welding point hole 27 is 0.8mm.

[0053] In the battery module structure of the lithium battery pack of this utility model, during installation, the battery cells 100 are first arranged in an array and installed in the battery pack housing. The battery cells 100 are positioned by the positioning frame 200, and the support column 202 of the positioning frame 200 is locked to the connection terminal of the battery pack housing by bolts.

[0054] Next, the signal acquisition board 1 is fixedly installed on the positioning frame 200, so that each power connection slot 3 corresponds to a battery cell 100;

[0055] Next, the contact piece 2 is fixed to the signal acquisition contact part 6 of the signal acquisition board 1 via the positioning protrusion 24, so that the positive contact piece 21 and the negative contact piece 22 are in close contact with the positive and negative terminals of the battery cell 100 in the contact grooves 3 on both sides of the signal acquisition contact part 6. The positive contact piece 21 and the negative contact piece 22 of the contact piece 2 are connected to the positive and negative terminals of the battery cell 100 respectively by laser welding, thus completing the series connection of the battery pack. The connection between the negative contact piece 22 and the negative terminal of the battery cell 100 can be quickly and easily checked by using a prying tool or by prying up the hook groove 26 of the inspection part 25 with a fingernail.

[0056] 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.

[0057] 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 structure for a lithium battery pack, characterized in that, include: Battery cell (100), multiple battery cells (100) arranged in an array; Positioning frame (200), the positioning frame (200) is provided with a plurality of positioning through holes (201) that are adapted to the top of the battery cell (100). Signal acquisition board (1), the signal acquisition board (1) is installed on the top surface of the positioning frame (200), the signal acquisition board (1) is provided with a plurality of power receiving slots (3) corresponding to the top of the battery cell (100) in the positioning through hole (201), and the signal acquisition power receiving part (6) is provided between two adjacent power receiving slots (3) on the signal acquisition board (1). The series circuit includes multiple contact pieces (2) installed on each signal acquisition contact part (6) of the signal acquisition board (1) that can connect two cells (100) corresponding to two adjacent contact slots (3) in series. A battery protection circuit board (300) is vertically arranged and installed on the side of the positioning frame (200). The top two sides of the battery protection circuit board (300) are respectively provided with a positive terminal interface (301) and a negative terminal interface (302) that are electrically connected to the positive and negative terminals of the series circuit. The middle of the top of the battery protection circuit board (300) is provided with a signal acquisition interface (303) that can be electrically connected to the signal acquisition junction (6) through a wire.

2. The battery module structure of a lithium battery pack according to claim 1, characterized in that, The positioning frame (200) has a protruding positioning terminal (203) on its side, and a screw hole is provided on the positioning terminal (203). The battery protection circuit board (300) has a first mounting hole (304) corresponding to the screw hole of the positioning terminal (203). The signal acquisition board (1) has a plurality of second mounting holes (5) connected to the positioning frame (200).

3. The battery module structure of a lithium battery pack according to claim 1, characterized in that, The signal acquisition board (1) has a positive external connector (7) and a negative external connector (8) on both sides of one end. The two ends of the positive external connector (7) are connected to the positive interface (301) and the negative terminal plate (101) of the battery cell (100) respectively. The two ends of the negative external connector (8) are connected to the negative interface (302) and the positive terminal post (102) of the battery cell (100) respectively.

4. The battery module structure 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 battery cell (100).

5. A battery module structure for a lithium battery pack according to claim 1, 2, 3, or 4, characterized in that, The contact piece (2) has a Z-shaped thin sheet structure. The two ends of the contact piece (2) are respectively provided with a positive electrode contact piece (21) and a negative electrode contact piece (22). One end of the negative electrode contact piece (22) is bent upward and provided with a transition connection part (23) connected to the positive electrode contact piece (21). The negative electrode contact piece (22) can be attached to the negative end plate (101) at the top of the cell (100). The positive electrode contact piece (21) can be attached to the positive electrode contact post (102) provided on the negative end plate (101) at the top of the cell (100).

6. The battery module structure of a lithium battery pack according to claim 5, characterized in that, The signal acquisition junction (6) is provided with three pinholes, and the positive terminal (21) is provided with three positioning protrusions (24) that are adapted to the pinholes at one end near the negative terminal (22).

7. The battery module structure of a lithium battery pack according to claim 5, characterized in that, The negative electrode contact (22) has an inspection section (25) that is tilted upwards at its end.

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

9. The battery module structure of a lithium battery pack according to claim 8, 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.

10. The battery module structure of a lithium battery pack according to claim 6, characterized in that, The positive electrode contact (21) and negative electrode contact (22) are provided with laser welding point holes (27).

Images