Battery information acquisition structure and integrated busbar

Abstract

A battery information acquisition structure comprises a first flexible printed circuit board, a PCB and a connector, the first flexible printed circuit board comprises a circuit board main body and a connecting arm which are integrally formed, one end of the connecting arm is connected with the end part of the circuit board main body, and the other end of the connecting arm is provided with a first output terminal with a plurality of first interfaces; the PCB is provided with a first input terminal, a plurality of first lines, at least one second line, a through hole and a second output terminal, the first input terminal and the second output terminal are respectively provided with a plurality of second interfaces and a plurality of third interfaces, the plurality of second interfaces are connected with the plurality of first interfaces in a one-to-one correspondence manner, each first line is located on the front surface or the back surface of the PCB, and each second line is located on the back surface of the PCB. Each second circuit is arranged on the front surface and the back surface of the PCB through a through hole, and the second output terminal is electrically connected with the connector. The utility model also provides an integrated busbar using the above structure. Compared with the prior art, the acquisition structure can solve the cross problem caused by sharing the BMS, and ensures the structural reliability at the same time.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery information collection structure technical field relates to a battery information collection structure and use the integrated busbar of this battery information collection structure. BACKGROUND

[0002] The existing flexible printed circuit board will consider the common problem of battery management system (BMS) when designing. In different battery modules, the arrangement of the battery modules is different, and the distribution of the nickel sheet and the temperature collection end on the flexible printed circuit board is also different. In order to make the definition of the line on the flexible printed circuit board consistent with the BMS, the line with inconsistent definition needs to be led to the corresponding position, but this will cause the problem of line crossing. For example, referring to Figure 1 , the BMS has 28 voltage interfaces, of which the 3rd and 4th are used to connect the first thermistor NTC of the flexible printed circuit board, the 20th and 21st are used to connect the second thermistor NTC of the flexible printed circuit board, and the 15th and 16th are used to connect the third thermistor NTC of the flexible printed circuit board. In the flexible printed circuit board of Figure 2 , the interfaces of T3 and T1 are 3-4 and 15-16, and the interfaces of these two NTCs can correspond to the interfaces on the BMS for connecting the NTC, while the interface of T2 is 8-9, which does not correspond to the last NTC interface on the BMS. Therefore, the line of T2 needs to be led to 20-21 to correspond to the interface on the BMS. However, on the circuit board, the line between the interface 8-9 and the interface 20-21 has already been arranged, and there is a problem of line crossing when directly plating copper on the circuit board.

[0003] In order to solve the problem of line crossing, the flexible printed circuit board is currently directly used as a double-sided structure, and a through hole is arranged at the position of the two interfaces that need to be plated with copper. By plating copper lines on the back of the copper lines and passing through the two through holes, the two positions are connected, thus solving the problem of crossing. However, due to the thin thickness of the flexible printed circuit board, when plating copper on the inner wall of the through hole, the copper adhesion on the inner wall is less, and the copper line in the through hole has low strength. After the flexible printed circuit board forms an integrated busbar (CCS) and is installed on the battery module, the flexible printed circuit board is easily pulled due to the expansion of the battery cell, and the copper line in the through hole is prone to unreliable problems. In order to reduce the impact of the expansion of the battery cell, in the existing integrated busbar, a reinforcing structure is arranged at the corresponding position of the through hole, which not only increases the cost, but also increases the assembly process difficulty of the integrated busbar. SUMMARY

[0004] The utility model aims at overcoming the deficiency in the prior art, and provides a battery information collection structure.

[0005] The utility model discloses a battery information collection structure, including first flexible printed circuit board, PCB board and connector, first flexible printed circuit board includes integrative circuit board main part and connecting arm, and connecting arm is located the outside of circuit board main part, and one end of connecting arm is connected with the end of circuit board main part, and the other end of connecting arm is equipped with first output terminal, and first output terminal is equipped with a plurality of first interface, be equipped with first input terminal, a plurality of first circuits, at least one second circuit, through -hole and second output terminal on the PCB board, and first input terminal and second output terminal are equipped with a plurality of second interface and a plurality of third interface respectively, and a plurality of second interface and a plurality of first interface are connected one by one, and each first circuit is located on the front or back of PCB board to connect corresponding second interface and third interface, and each second circuit is arranged on the front and back of PCB board through the through -hole to connect staggered second interface and third interface, and the second output terminal is electrically connected with the connector, and the connector is used to be electrically connected with the shared battery management system.

[0006] Preferably, the circuit board main part is provided with a buffer arm, and a free end of the buffer arm is a collection end for connecting with the aluminum bar;

[0007] The PCB board and the connector are provided with a second flexible printed circuit board for electrically connecting the two together.

[0008] Preferably, the PCB board is a double-sided PCB board.

[0009] Preferably, all the buffer arms are arranged on one side of the circuit board main part, the circuit board main part is arranged in a ring shape to be connected with at least two rows of aluminum bars, and the connecting arm is connected to an end of the circuit board main part.

[0010] Preferably, the circuit board main part is in a U shape.

[0011] Preferably, the connecting arm is horizontally bent inward to form a first connecting arm, the first connecting arm is bent away from the circuit board main part to form a second connecting arm, the second connecting arm is vertically bent downward to form a third connecting arm, and an end of the third connecting arm is electrically connected with the PCB board.

[0012] The bottom of the first connecting arm and the second connecting arm is provided with foam.

[0013] Preferably, the first flexible printed circuit board is a single-sided first flexible printed circuit board.

[0014] Preferably, the utility model further includes a protective seat, the protective seat is installed on the battery module shell, the PCB board is installed in the protective seat, and the material of the protective seat is an insulating protective material.

[0015] Preferably, the protective seat comprises a fixing seat and a cover body, the fixing seat is provided with a mounting cavity for mounting the PCB, and the cover body covers the mounting cavity.

[0016] The utility model discloses still provide integrated busbar of using above-mentioned battery information collection structure.

[0017] An integrated busbar comprises a support, an aluminum bar arranged on the support and a battery information collection structure, wherein the battery information collection structure is any one of the battery information collection structures described above.

[0018] Compared with the prior art, the utility model has the beneficial effects that:

[0019] The interface definition of the first flexible printed circuit board is inconsistent with the BMS, and in the battery information collection structure of the utility model, a PCB is arranged between the first flexible printed circuit board and the connector, the PCB is provided with a first input terminal, a plurality of first lines, at least one second line, a through hole and a second output terminal, the first input terminal and the second output terminal are respectively provided with a plurality of second interfaces and a plurality of third interfaces, the plurality of second interfaces are connected with the plurality of first interfaces one by one, and the first flexible printed circuit board and the PCB are thus docked; each first line is located on the front face or the back face of the PCB so as to connect the corresponding second interface and third interface, and each second line is arranged on the front face and the back face of the PCB through the through hole so as to connect the staggered second interface and third interface, and thus, for the case that the interface of the first flexible circuit board does not correspond to the interface of the BMS, the through hole is arranged at the position of the second interface, the second line is connected with the interface and then passes through the through hole, and then passes through the through hole of the corresponding third interface to be connected with the third interface, so as to solve the cross problem.

[0020] Since the PCB has a certain thickness, the inner side wall of the through hole has a larger area, which can adhere to more materials, and thus the size of the second line in the through hole is relatively larger, the strength is better, and the reliability is better, which can improve the conductivity and the service life.

[0021] In the prior art, the second line on the double-sided flexible printed circuit board is formed through a copper plating process, and since the thickness of the through hole is relatively thin, the copper plating process is difficult, and in the utility model, the depth of the through hole of the PCB is large, and the inner wall area is large, which is more convenient for copper plating and reduces the difficulty of the copper plating process.

[0022] After the first flexible printed circuit board (PCB) is integrated into the busbar and mounted on the battery module, the position of the PCB body corresponds to the battery cell of the module. This position is affected by the expansion of the battery cell, which will exert a pulling force on the first PCB. Since the PCB is located outside the first PCB, this position is not located within the expansion area of ​​the battery cell. This avoids the second circuit in the through hole being pulled due to the expansion of the battery cell, which would reduce its service life or even cause damage. It also avoids damage to the PCB and prevents interference between the PCB and the first PCB during assembly, thus avoiding damage to the electronic components on the PCB.

[0023] The PCB board does not have a cell expansion area and also has relatively stronger structural strength. Therefore, it does not need to have a reinforcing structure at the through hole position as required in the existing technology. The structure is simple and the cost is reduced. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of a battery management system in the prior art;

[0025] Figure 2 This is a schematic diagram of the structure of a flexible printed circuit board in the prior art;

[0026] Figure 3 This is a three-dimensional structural diagram of the battery information acquisition structure in Example 1;

[0027] Figure 4 for Figure 3 A partial three-dimensional exploded view of the battery information acquisition structure;

[0028] Figure 5 This is a schematic diagram of the PCB board structure;

[0029] Figure 6 This is a schematic diagram of another three-dimensional structure of the battery information acquisition structure in Example 1;

[0030] Figure 7 for Figure 6 A partial three-dimensional exploded view of the battery information acquisition structure;

[0031] First flexible printed circuit board 100; circuit board body 110; buffer arm 111; connecting arm 120; first connecting arm 121; second connecting arm 122; third connecting arm 123; foam 124;

[0032] PCB board 200; First input terminal 210; Second interface 211; First line 212; Second line 213; Through hole 214; Second output terminal 220; Third interface 221;

[0033] Connector 300;

[0034] Second flexible printed circuit board 400;

[0035] Protective seat 500; fixed seat 510; cover 520;

[0036] Aluminum bar 600;

[0037] Battery module housing 700. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model will be further described in detail below in combination with the drawings and specific embodiments.

[0039] Example 1

[0040] A battery information acquisition structure, see Figures 3-5 Including first flexible printed circuit board 100, PCB board 200 and connector 300, first flexible printed circuit board 100 includes integrally-formed circuit board main body 110 and connecting arm 120, connecting arm 120 is located at the outside of circuit board main body 110, the one end of connecting arm 120 is connected with the end of circuit board main body 110, the other end of connecting arm 120 is equipped with first output terminal, first output terminal is equipped with multiple first interfaces, first input terminal 210, multiple first lines 212, at least one second line 213, through-hole 214 and second output terminal 220 are provided on PCB board 200, first input terminal 210 and second output terminal 220 are respectively equipped with multiple second interfaces 211 and multiple third interfaces 221, multiple second interfaces 211 are connected one by one with multiple first interfaces, so that the butt joint of first flexible printed circuit board 100 and PCB board 200 is realized;Every first line 212 is located on the front or back of PCB board 200 to connect corresponding second interface 211 and third interface 221, every second line 213 is arranged on the front and back of PCB board 200 through through-hole 214 to connect staggered second interface 211 and third interface 221, so, for the case that first flexible circuit board interface does not correspond with BMS interface, through-hole 214 is arranged at the position of the second interface 211, second line 213 is connected with the interface and then passes through through-hole 214, not to the other side of PCB board 200, then passes through the through-hole 214 of corresponding third interface 221 to be connected with third interface 221, to solve the cross problem.

[0041] The above-mentioned battery information acquisition structure of the embodiment can solve the line crossing problem caused by the common use of a BMS by the flexible printed circuit board, and has the following advantages:

[0042] First, since the PCB board 200 has a certain thickness, the inner side wall of the through hole 214 has a larger area, which can adhere more material, so that the size of the second circuit 213 located in the through hole 214 is relatively larger, stronger and more reliable, which can improve the conductivity and prolong the service life.

[0043] Second, in the prior art, the second circuit 213 on the double-sided flexible printed circuit board is formed by a copper plating process. Since the thickness of the through hole 214 is thin, the copper plating process is difficult. In the utility model, the second circuit 213 is also formed by a copper plating process. The depth of the through hole 214 of the PCB board 200 is large, and the inner wall area is large, which is more convenient for copper plating and reduces the difficulty of the copper plating process.

[0044] Third, after the first flexible printed circuit board 100 is formed on the integrated busbar mounting battery module, the position of the circuit board body 110 corresponds to the cell of the module. This position is affected by the expansion of the cell, which will pull the first flexible printed circuit board 100. Since the PCB board 200 is arranged on the outer side of the first flexible printed circuit board 100, this position is not located in the expansion area of the cell of the module. Therefore, the second circuit 213 in the through hole 214 is prevented from being pulled due to the expansion of the cell, the service life is reduced, and even damage occurs. It can also avoid damage to the PCB board 200, and can also avoid interference between the PCB board 200 and the first flexible printed circuit board 100 during assembly, and damage to the electronic components on the PCB board 200.

[0045] Fourth, the PCB board 200 is not arranged in the cell expansion area, and also has relatively stronger structural strength, so it is not necessary to set a reinforcing structure at the position of the through hole 214 as in the prior art, the structure is simple, and the cost is reduced.

[0046] In this embodiment, the second output terminal 220 is electrically connected with the connector 300. The contacts on the connector 300 correspond to and are the same as the contacts on the BMS one by one, and are used to be electrically connected with the shared battery management system.

[0047] In the embodiment, the circuit board body 110 is provided with a buffer arm 111, and a free end of the buffer arm 111 is a collection end for connecting with the aluminum bar 600. The buffer arm 111 can have a shape such as S shape, and the like, to relieve the influence of the swelling of the battery cell on the connection reliability between the nickel sheet and the aluminum bar 600. In practice, the buffer arm 111 has small size and low strength, and is easily damaged by pulling. In the embodiment, the PCB board 200 and the connector 300 are located outside the first flexible printed circuit board 100, and the integrated busbar assembly is in a drooping state. If the connector 300 is directly connected to the PCB board 200, the size of the PCB board 200 needs to be set larger, so that the connector 300 can be mounted on the PCB board 200. However, the increase of the size of the PCB board 200 increases the weight of the PCB board 200. After the connector 300 is connected to the PCB board 200, the weights of the PCB board 200 and the connector 300 are superposed, and the overall weight is larger. The greater the gravity, the greater the pulling force, which can pull the buffer arm 111 close to the PCB board 200 and cause damage. Therefore, the PCB board 200 and the connector 300 are further provided with a second flexible printed circuit board 400 for electrically connecting the PCB board 200 and the connector 300 together. In this way, the second flexible printed circuit board 400 can directly connect the connector 300 to the BMS, and the connector 300 is fixed on the BMS. At this time, the structure for applying the pulling force to the buffer arm 111 is only the PCB board 200. Since the gravity for providing the pulling force is reduced, the pulling force on the buffer arm 111 is reduced, which reduces the damage to the buffer arm 111. The second flexible printed circuit board 400 has the characteristics of being bendable and windable, and can be more flexible in operation and connection when connecting the connector 300.

[0048] In the embodiment, the PCB 200 can be a single-sided PCB 200, which has the following advantages. Since the first interfaces and the third interfaces 221 at both ends of the first lines 212 on the PCB 200 are connected one by one, all the first lines 212 can be arranged on one side of the PCB 200, such as the front side. In the second lines 213, since the corresponding second interfaces 211 and the third interfaces 221 are arranged staggeredly, the through holes 214 are arranged at the positions of the corresponding second interfaces 211 and the third interfaces 221, and the copper lines are arranged on the back side of the PCB 200 after passing through the through holes 214. Since no other lines are arranged on the back side, there is no need to consider the wiring problem, and the design is simpler and more versatile. However, the single-sided PCB 200 has a large size and weight, which still has a certain influence on the buffer arms 111. Therefore, in the embodiment, the PCB 200 is a double-sided PCB 200, part of the first lines 212 are arranged on the front side of the PCB 200, and the other part of the first lines 212 are arranged on the front side of the PCB 200. The two interfaces of the second lines 213 are still connected through the interfaces. The double-sided PCB 200 has the first lines 212 arranged on both sides, which can reduce the size and weight and reduce the influence on the buffer arms 111. After using the double-sided PCB 200, the wiring of the second lines 213 can be arranged according to actual needs, which will not be described here.

[0049] In the embodiment, all the buffer arms 111 are arranged on one side of the circuit board body 110, and the circuit board body 110 is arranged around to be connected with the at least two rows of aluminum bars 600, and the connecting arms 120 are connected to the ends of the circuit board body 110. By arranging all the buffer arms 111 of the circuit board body 110 on one side, compared with the structure that the buffer arms 111 are arranged on both sides of the circuit board body 110, the width of the first flexible printed circuit board 100 in the embodiment is smaller, which is more flexible in actual docking process, saves materials and reduces costs.

[0050] Further, due to the width limitation of the circuit board body 110, a large number of lines cannot be arranged on the circuit board body 110. Therefore, in the embodiment, the circuit board body 110 is in a U shape, and only connects two rows of aluminum bars.

[0051] In the embodiment, the connecting arm 120 is horizontally bent inward to form a first connecting arm 121, the first connecting arm is bent to a side away from the circuit board body 110 to form a second connecting arm 122, the second connecting arm is vertically bent downward to form a third connecting arm 123, and the third connecting arm is folded to be connected to the front and back surfaces of the PCB board 200. The bottom of the first connecting arm and the second connecting arm is provided with a foam 124. The foam 124 can not only insulate and thermally insulate the connecting arm and the battery module, but also can buffer the connecting arm. In addition, when the PCB board 200 is in a sagging state, the position opposite to the corner position of the battery module shell 700 can be protected, and the problem of white line and damage caused by long-term abutment of the battery module shell corner can be avoided.

[0052] In the embodiment, the first flexible printed circuit board 100 is a single-sided first flexible printed circuit board 100.

[0053] After the battery information collection structure of the embodiment is formed into an integrated busbar, the PCB board 200 is in a sagging state. In other factual ways, referring to Figures 6-7 , the battery information collection structure further includes a protection seat 500, and the above-mentioned PCB board 200 is installed in the protection seat 500. The protection seat 500 is installed on the battery module shell, so that the PCB board 200 is fixed on the battery module shell, and the problem of pulling of the buffer arm 111 caused by the gravity of the PCB board 200 is completely solved. The PCB board 200 is installed in the protection shell, which also plays a dustproof role, and can also avoid the friction and damage of the electronic components on the PCB board 200 with the outside. The material of the protection seat 500 is an insulating protection material, which can insulate and thermally insulate between the PCB board 200 and the battery module shell (which is generally a metal material), reduce the influence of the heat emitted by the battery module shell on the electronic components on the PCB board 200, and also avoid damage to the electronic components on the PCB board 200 caused by electric leakage.

[0054] Of course, it can be understood that although the fixing seat 510 can fix the PCB board 200, compared with the previous embodiment of the embodiment, the fixing seat 510 needs to be manufactured and assembled, and the process steps and cost are relatively higher.

[0055] The protection seat 500 includes a fixing seat 510 and a cover 520, the fixing seat 510 is provided with a mounting cavity for mounting the PCB board 200, and the cover 520 covers the mounting cavity.

[0056] Embodiment 2

[0057] An integrated busbar includes a support (not shown in the figure), an aluminum bar provided on the support, and a battery information collection structure, and the battery information collection structure is the battery information collection structure of embodiment 1.

[0058] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, it is not necessary and also impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application claims.

Claims

1. A battery information collection structure characterized by comprising: The battery information acquisition structure comprises a first flexible printed circuit board, a PCB board and a connector, the first flexible printed circuit board comprises an integrally formed circuit board body and a connecting arm, the connecting arm is located on the outer side of the circuit board body, one end of the connecting arm is connected with the end of the circuit board body, and the other end of the connecting arm is provided with a first output terminal, the first output terminal is provided with a plurality of first interfaces, the PCB board is provided with a first input terminal, a plurality of first lines, at least one second line, a through hole and a second output terminal, the first input terminal and the second output terminal are respectively provided with a plurality of second interfaces and a plurality of third interfaces, the plurality of second interfaces are connected with the plurality of first interfaces one by one, each first line is located on the front surface or the back surface of the PCB board so as to connect the corresponding second interface and third interface, each second line is arranged on the front surface and the back surface of the PCB board through the through hole so as to connect the staggered second interface and third interface, the second output terminal is electrically connected with the connector, and the connector is used for being electrically connected with a shared battery management system.

2. The battery information collecting structure according to claim 1, characterized by: The circuit board body is provided with a buffer arm, and the free end of the buffer arm is a collection end for being connected with an aluminum bar. The PCB board and the connector are provided with a second flexible printed circuit board for electrically connecting the two together.

3. The battery information collecting structure according to claim 2, characterized by: The PCB board is a double-sided PCB board.

4. The battery information collecting structure according to claim 2, characterized by: All the buffer arms are arranged on one side of the circuit board body, the circuit board body is arranged in a ring shape to be connected with at least two rows of aluminum bars, and the connecting arm is connected to the end of the circuit board body.

5. The battery information collecting structure according to claim 4, characterized by: The circuit board body is in a U shape.

6. The battery information collecting structure according to claim 4, characterized by: The connecting arm is horizontally bent inward to form a first connecting arm, the first connecting arm is bent away from the circuit board body to form a second connecting arm, the second connecting arm is vertically bent downward to form a third connecting arm, and the end of the third connecting arm is electrically connected with the PCB board. The bottom of the first connecting arm and the second connecting arm is provided with foam.

7. The battery information collecting structure according to claim 4, characterized by: The first flexible printed circuit board is a single-sided first flexible printed circuit board.

8. The battery information collecting structure according to claim 1, characterized by: The battery information acquisition structure further comprises a protective seat, the protective seat is mounted on the battery module shell, the PCB board is mounted in the protective seat, and the material of the protective seat is insulating protective material.

9. The battery information collecting structure according to claim 8, characterized by: The protective seat comprises a fixing seat and a cover body, the fixing seat is provided with a mounting cavity for mounting the PCB board, and the cover body covers the mounting cavity.

10. An integrated busbar, comprising a support, an aluminum bar arranged on the support, and a battery information acquisition structure, characterized in that: The battery information acquisition structure is the battery information acquisition structure according to any one of claims 1-9. The battery information acquisition structure is the battery information acquisition structure according to any one of claims 1-9.

Images