A connection circuit board for a battery module

Abstract

The invention discloses a connection circuit board for a battery module, comprising a board body, wherein a plurality of pole lug connection positions are respectively arranged on both sides of a midline in a length direction of the board body, the pole lug connection positions on the same side of the midline are parallel to each other, a conductive sheet is arranged on the same side of the board body at each pole lug connection position, a conductive circuit integrated in the board body is arranged on a side of each conductive sheet close to the midline, one end of the conductive circuit is connected to the conductive sheet, and the other end is converged to a voltage measurement wiring position; a plurality of positioning holes penetrating the conductive sheet and the board body are arranged at intervals at each pole lug connection position; the battery module comprises a plurality of single cells stacked in parallel with each other, a positive pole lug and a negative pole lug are respectively arranged at both ends of the single cells, and a connection circuit board is respectively arranged at both ends of the battery module.

Description

Technical Field

[0001] The invention belongs to the technical field of battery processing, and in particular relates to a connection circuit board for a battery module. Background Art

[0002] A lithium battery pack is composed of multiple batteries connected in series or in parallel through tabs. The reliability and convenience of the connection are very important. Since the battery pack includes many single cells, the tabs of the single cells need to be connected to the conductive circuit on the connection circuit board. The connection workload between the tabs is large. The existing circuit board is set up in such a way that each tab must be connected to a wire for voltage measurement. The existing tabs are used to measure voltage. The wires are led out of the circuit board body, and the outer ends of the wires are arranged on the voltage measurement cable holder. The voltage measurement cable holder is then installed on the circuit board. This setting method causes a large number of voltage lines to be distributed in the battery pack. On the one hand, it is not neat and beautiful. On the other hand, it is easy to cause connection errors, resulting in low battery assembly efficiency.

[0003] In addition, when the existing circuit connection board is connected to the battery tabs, it is also necessary to set a tab connection base plate between the battery and the circuit board. During assembly, the tabs on the battery pass through the tab connection base plate and the connection circuit board, and then the tabs of the two stacked batteries are superimposed on each other. When the tabs of the two batteries are superimposed on each other, laser welding is adopted, and the connection method between the tabs and the conductive circuit on the connection circuit board is also laser welding. Such a setting method not only makes the battery assembly process cumbersome and increases the cost, but also once a problem occurs in the connection between a single battery and the circuit board and needs to be repaired, the welding part needs to be destroyed and then re-welded and assembled, which causes great damage to the circuit board, making it impossible to replace and repair the same part multiple times. If the same problem occurs in the same part again, it is easy to cause the entire part to be scrapped, which not only increases the maintenance cost, but also easily causes waste of resources. Summary of the invention

[0004] The present invention aims to solve the defects of the prior art and provides a connection circuit board for a battery module.

[0005] The technical solution of the present invention is as follows:

[0006] A connection circuit board for a battery module comprises a board body, wherein a plurality of tab connection positions are respectively arranged on both sides of a midline in a length direction of the board body, the tab connection positions on the same side of the midline are parallel to each other, a conductive sheet is arranged on the same side of the board body at each tab connection position, a conductive circuit integrated in the board body is arranged on the side of each conductive sheet close to the midline, one end of the conductive circuit is connected to the conductive sheet, and the other end is converged to a voltage measurement wiring position; a plurality of positioning holes penetrating the conductive sheet and the board body are arranged at intervals at each tab connection position; the battery module comprises a plurality of mutually parallel and superimposed single cells, and the two ends of the single cells are respectively arranged A positive electrode ear and a negative electrode ear are arranged, and a connecting circuit board is arranged at each end of the battery module. Through holes corresponding to the size and position of the positioning hole are respectively provided on the positive electrode ear and the negative electrode ear. The electrode ears with opposite polarities in the upper and lower adjacent single batteries stacked on each other are stacked on each other. After being stacked, the electrode ears with opposite polarities in the two single batteries contact the conductive sheet on the connecting circuit board at the same end. An electrode ear pressure strip is placed on the outer side of the stacked electrode ears, and screw holes corresponding to the size and position of the positioning hole are arranged on the electrode ear pressure strip. Screws are passed through the electrode ear pressure strip, the stacked electrode ears, the conductive sheet and the board body to fix the two electrode ears with opposite polarities on the board body.

[0007] The two ends of the tab connection positions located on the same side of the center line are aligned with each other.

[0008] Three screw holes are arranged at intervals on each lug connection position.

[0009] The conductive circuit is located in the board body toward the back side of the side where the conductive sheet is arranged.

[0010] The top pole ear connection position of the connection circuit board at one end of the battery module leads to the positive electrode of the battery module, and the top pole ear connection position on the connection circuit board at the other end of the battery module leads to the negative electrode of the battery module.

[0011] The top surface of the tab strip is provided with a groove along the length direction, the groove is located on the center line of the tab strip, and a sawtooth-shaped strip protrusion is provided on the bottom surface.

[0012] The upper surface of the tab strip is an arc surface that arches upward.

[0013] The groove is a V-shaped structure.

[0014] The beneficial effects of the present invention are as follows:

[0015] 1. The connecting circuit board described in the invention has a lug connection position on the same side of the board body, and a conductive sheet is arranged on the lug connection position, and a conductive circuit for voltage measurement integrated in the board body is arranged at the end of each conductive sheet. With this arrangement, when assembling the battery and the connecting circuit board, there is no need to arrange the conductive circuit, thereby avoiding the distribution of a large number of voltage lines in the battery pack to affect the appearance and occupy space, and also avoiding the problem of incorrect voltage line arrangement. It is only necessary to connect the single battery to the lug connection position on the connecting circuit board, which greatly improves the assembly efficiency of the battery and reduces labor costs.

[0016] 2. The connection circuit board described in the present invention does not need to set a tab connection base plate between the battery and the circuit board. The tabs of the single battery can be directly connected to the tab connection positions of the connection circuit board, which reduces the problem of assembly errors caused by multiple connection components and can also reduce material costs and labor costs.

[0017] 3. The connection circuit board described in the present invention has a positioning hole at the pole ear connection position, and through holes corresponding to the positioning holes are set on the positive and negative ears of the battery. When the positive and negative ears of two single batteries are connected, the pole ears are pressed by the pole ear pressure strips and the pole ear pressure strips and the board body are fixed together by screws, so that the positive and negative ears of the two single batteries are connected and fixed to the pole ear connection position, and there is no need to weld and fix the pole ears, so that the battery assembly is convenient and efficient, and the assembly cost is reduced.

[0018] 4. Since the battery tabs are positioned and fixed by tab pressure strips, they can be connected with screws when the battery is assembled. This arrangement makes it easy to disassemble and repair, avoids the problem of troublesome repair procedures caused by welding connections, increased repair costs, and even overall scrapping, and improves the reuse rate of connected circuit boards, thereby saving costs, saving resources, and is beneficial to environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a side of the connection circuit board of the present invention facing away from the battery module;

[0020] Figure 2 A schematic diagram of the assembly of a single cell and a connection circuit board according to the present invention;

[0021] Figure 3 It is a structural schematic diagram of the single cell of the present invention;

[0022] Figure 4 This is a schematic diagram of the side of the connection circuit board facing the battery module of the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the tab layer strip of the present invention;

[0024] Figure 6 It is a schematic diagram of the assembly form of the positive and negative tabs at the ends of two batteries stacked on each other on the connection circuit board;

[0025] The serial numbers and their corresponding names in the figure are as follows:

[0026] 1- plate body, 2- ear connection position, 3- conductive sheet, 4- conductive circuit, 5- voltage measurement wiring position, 6- positioning hole, 7- single battery, 8- positive ear, 9- negative ear, 10- through hole, 11- ear pressure strip, 12- screw hole, 13- screw, 14- positive electrode of battery module, 15- negative electrode of battery module, 16- groove, 17- bar protrusion. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] like Figure 1-6 A connection circuit board of a battery module shown in the figure comprises a board body 1, wherein a plurality of tab connection positions 2 are respectively arranged on both sides of a midline in a length direction of the board body, the tab connection positions on the same side of the midline are parallel to each other, a conductive sheet 3 is arranged on the same side of the board body at each tab connection position, a conductive circuit 4 integrated in the board body is arranged on the side of each conductive sheet close to the midline, one end of the conductive circuit is connected to the conductive sheet, and the other end converges to a voltage measurement wiring position 5; a plurality of positioning holes 6 penetrating the conductive sheet and the board body are arranged at intervals at each tab connection position 2; the battery module comprises a plurality of mutually parallel and superimposed single cells 7, and a positive tab 8 and a negative tab 9 are respectively arranged at both ends of the single cells A connecting circuit board is provided at each end of the battery module, and through holes 10 corresponding to the size and position of the positioning holes are respectively provided on the positive and negative ears. The ears with opposite polarities in the upper and lower adjacent single batteries stacked on each other are stacked on each other. After being stacked, the ears with opposite polarities in the two single batteries contact the conductive sheet on the connecting circuit board at the same end, and an ear pressure strip 11 is placed on the outer side of the stacked ears. Screw holes 12 corresponding to the size and position of the positioning holes are provided on the ear pressure strip. Screws 13 are passed through the ear pressure strip, the stacked ears, the conductive sheet and the board body to fix the two ears with opposite polarities on the board body, thereby realizing the series connection between the stacked single batteries.

[0029] The two ends of the tab connection positions 2 located on the same side of the center line are aligned with each other.

[0030] The screw holes 12 are arranged three at intervals at each lug connection position.

[0031] The conductive circuit 4 is located in the board body toward the back side of the side where the conductive sheet is disposed.

[0032] The top tab connection position of the connection circuit board at one end of the battery module leads to the positive electrode 14 of the battery module, and the top tab connection position of the connection circuit board at the other end of the battery module leads to the negative electrode 15 of the battery module.

[0033] The top surface of the tab strip 11 is provided with a groove 16 along the length direction, the groove is located on the center line of the tab strip, and a sawtooth-shaped strip protrusion 17 is provided on the bottom surface.

[0034] The upper surface of the tab strip 11 is an arc surface that arches upward.

[0035] The groove 16 is a V-shaped structure.

[0036] The connection circuit board structure of the present invention, when used in the case where the positive electrode ear and the negative electrode ear are respectively arranged at the two ends of the single battery, then a connection circuit board is respectively arranged at the two ends of the single battery, such as Figure 1 and Figure 4 The figure shows two sides of a set of connection circuit boards arranged at both ends of the battery module. Figure 4 It is the connection surface with the positive and negative ears of the battery module. Figure 4 The C1-C17 marked on the end of the conductive sheet indicates that this set of connection circuit boards can be installed with 17 single cells. C1-C17 represents the serial number of each single cell. Figure 4 C1-~C17- in the figure represent the connection positions of the negative pole ears of the C1th to C17th single cells, and C1+~C17+ represent the connection positions of the positive pole ears of the C1th to C17th single cells. When the positive pole ear and the negative pole ear are respectively arranged at both ends of the single cell, for example, the positive pole ear of the first single cell C1 is connected to the position of C1+, then the negative pole ear of the single cell is connected to the position of C1- of another connection circuit board, and the positive pole ear of the second single cell C2 is connected to the negative pole ear of the first single cell. Figure 4 In the figure, C1- / C2+ is used to represent the negative electrode ear of the second single cell and the positive electrode ear of the third single cell C3 are connected, and so on, until the electrode ear connection positions on the connection circuit board are connected to the electrode ears of the single cells, forming a series connection between the batteries, and then the positive electrode 14 of the battery module is led out from the positive electrode ear connection of the first single cell, and the negative electrode of the battery module is led out from the negative electrode ear connection of the last single cell.

[0037] The connecting circuit board described in the present invention has a pole lug connection position on the same side of the board body, and a conductive sheet is arranged on the pole lug connection position, and a conductive circuit for voltage measurement integrated in the board body is arranged at the end of each conductive sheet. With this arrangement, when assembling the battery and the connecting circuit board, there is no need to arrange the conductive circuit, thereby avoiding the distribution of a large number of voltage lines in the battery pack to affect the appearance and occupy space, and also avoiding the problem of incorrect voltage line arrangement. It is only necessary to connect the single battery to the pole lug connection position on the connecting circuit board, which greatly improves the assembly efficiency of the battery and reduces labor costs.

[0038] The connecting circuit board described in the present invention does not need to set a tab connection base plate between the battery and the circuit board. The tabs of the single battery can be directly connected to the tab connection positions of the connecting circuit board, thereby reducing the problem of assembly errors caused by multiple connecting components and reducing material costs and labor costs.

[0039] The connection circuit board described in the present invention has a positioning hole at the pole ear connection position, and through holes corresponding to the positioning holes are set on the positive pole ear and the negative pole ear of the battery. When the positive pole ear and the negative pole ear of two single batteries are connected, the pole ear pressure strip is used to press the pole ear and the pole ear pressure strip and the plate body are fixed together by screws, so that the positive pole ear and the negative pole ear of the two single batteries are connected and fixed to the pole ear connection position, and there is no need to weld and fix the pole ear, so that the battery assembly is convenient and efficient, and the assembly cost is reduced.

[0040] Since the battery tabs are positioned and fixed by tab pressure strips, they can be connected with screws when the battery is assembled. This arrangement facilitates disassembly and maintenance, avoids the problem of troublesome maintenance procedures caused by welding connections, increased maintenance costs, and even overall scrapping, and increases the reuse rate of connected circuit boards, thereby saving costs and resources, and is beneficial to the environment.

Claims

1. A connection circuit board for a battery module, characterized in that: The invention comprises a plate body (1), wherein a plurality of tab connection positions (2) are respectively arranged on both sides of a midline in the length direction of the plate body, the tab connection positions on the same side of the midline are parallel to each other, a conductive sheet (3) is arranged on the same side of the plate body at each tab connection position, a conductive circuit (4) integrated in the plate body is arranged on the side of each conductive sheet close to the midline, one end of the conductive circuit is connected to the conductive sheet, and the other end converges to a voltage measurement wiring position (5); a plurality of positioning holes (6) penetrating the conductive sheet and the plate body are arranged at intervals on each tab connection position (2); and a battery module comprises a plurality of mutually parallel and stacked single cells (7), and positive tabs (8) are respectively arranged at both ends of the single cells. ) and a negative electrode ear (9), a connecting circuit board is respectively arranged at both ends of the battery module, and a through hole (10) corresponding to the size and position of the positioning hole is respectively provided on the positive electrode ear and the negative electrode ear, and the electrode ears with opposite polarities in the upper and lower adjacent single cells stacked on each other are stacked on each other, and the electrode ears with opposite polarities in the two single cells are stacked and contact the conductive sheet on the connecting circuit board at the same end, and an electrode ear pressure strip (11) is placed on the outer side of the stacked electrode ears, and a screw hole (12) corresponding to the size and position of the positioning hole is provided on the electrode ear pressure strip, and screws (13) are passed through the electrode ear pressure strip, the stacked electrode ears, the conductive sheet and the plate body to fix the two electrode ears with opposite polarities on the plate body; Wherein, the two ends of the tab connection positions (2) located on the same side of the midline are aligned with each other; The top tab connection position of the connection circuit board at one end of the battery module leads to the positive electrode (14) of the battery module, and the top tab connection position of the connection circuit board at the other end of the battery module leads to the negative electrode (15) of the battery module; The top surface of the tab strip (11) is provided with a groove (16) along the length direction, the groove is located on the center line of the tab strip, and a sawtooth-shaped strip protrusion (17) is provided on the bottom surface.

2. The connection circuit board of the battery module according to claim 1, characterized in that: Three screw holes (12) are arranged at intervals on each lug connection position.

3. The connection circuit board of the battery module according to claim 1, characterized in that: The conductive circuit (4) is located in the plate body towards the back side of the side where the conductive sheet is arranged.

4. The connection circuit board of the battery module according to claim 1, characterized in that: The upper surface of the tab strip (11) is an upwardly arched arc surface.

5. The connection circuit board of the battery module according to claim 1, characterized in that: The groove (16) is a V-shaped structure.

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