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 invention 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 present invention belongs to the technical field of battery information collection structures, and relates to a battery information collection structure and an integrated busbar using the battery information collection structure. Background Art

[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 battery cells is different. Correspondingly, the distribution of nickel sheet and temperature collection terminal on the flexible printed circuit board is also different. If the definition of the line on the flexible printed circuit board is to be consistent with that of BMS, the lines with inconsistent definitions need to be led to the corresponding positions, but this will cause the problem of line crossing. For example, see 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. Figure 2 In the flexible printed circuit board, the interfaces of T3 and T1 are 3-4 and 15-16. The interfaces of these two NTCs can correspond to the interfaces for connecting NTCs on the BMS, while the interface of T2 is 8-9, which does not correspond to the last NTC interface on the BMS. Therefore, it is necessary to lead the line of T2 to 20-21 to correspond to the interface on the BMS. However, on the circuit board, the wires have been laid from interface 8-9 to interface 20-21. There is a problem of line crossing when copper is directly plated on the circuit board.

[0003] In order to solve the problem of line crossing, the flexible printed circuit board is currently directly adopted as a double-sided structure, and through holes are set at the two interface positions that need copper plating. The two positions are connected by copper plating the copper wire on the back of the copper plating wire through two through holes at the same time, thus solving the crossing problem. However, due to the thin thickness of the flexible printed circuit board, when the inner wall of the through hole is copper plated, the amount of copper attached to the inner wall is small, and the strength of the copper wire in the through hole is low. After the flexible printed circuit board forms an integrated busbar (CCS) and is installed on the battery module, it is affected by the expansion of the battery cell, the flexible printed circuit board is easily pulled, and the copper wire in the through hole is prone to unreliable problems. In order to reduce the impact of the battery cell expansion, a reinforcement structure is set at the corresponding position of the through hole in the existing integrated busbar, which not only increases the cost, but also increases the difficulty of the assembly process of the integrated busbar. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a battery information collection structure.

[0005] To achieve the above objectives, the present invention discloses a battery information collection structure, including a first flexible printed circuit board, a PCB board and a connector, the first flexible printed circuit board including an integrally formed circuit board body and a connecting arm, the connecting arm is located on the outside of the circuit board body, one end of the connecting arm is connected to the end of the circuit board body, 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 circuits, at least one second circuit, 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 one-to-one with the plurality of first interfaces, each first circuit is located on the front or back side of the PCB board so as to connect the corresponding second interface and the third interface, each second circuit is arranged on the front and back sides of the PCB board through the through hole so as to connect the staggered second interface and the third interface, the second output terminal is electrically connected to the connector, and the connector is used to be electrically connected to a common battery management system.

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

[0007] A second flexible printed circuit board is provided between the PCB board and the connector to electrically connect the two together.

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

[0009] Preferably, all buffer arms are arranged on one side of the circuit board body, the circuit board body is arranged around to be connected to at least two rows of aluminum bars, and the connecting arms are connected to the end of the circuit board body.

[0010] Preferably, the circuit board body is U-shaped.

[0011] Preferably, the connecting arm is bent horizontally inward to form a first connecting arm, the transverse connecting arm is bent toward a side away from the circuit board body to form a second connecting arm, the second connecting arm is bent vertically downward to form a third connecting arm, and an end of the third connecting arm is electrically connected to the PCB board;

[0012] Foam is provided at the bottom of the first connecting arm and the second connecting arm.

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

[0014] Preferably, it also includes a protective seat, which is installed on the battery module housing, and 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 an installation cavity for installing a PCB board, and the cover body covers the installation cavity.

[0016] The present invention also provides an integrated busbar using the above-mentioned battery information collection structure.

[0017] An integrated busbar comprises a bracket, an aluminum bar arranged on the bracket 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 present invention has the following beneficial effects:

[0019] The interface definition of the first flexible printed circuit board is inconsistent with that of the BMS. In the battery information collection structure of the present invention, a PCB board is arranged between the first flexible printed circuit board and the connector, and a first input terminal, a plurality of first circuits, at least one second circuit, a through hole, and a second output terminal are provided on the PCB board. The first input terminal and the second output terminal are respectively provided with a plurality of second interfaces and a plurality of third interfaces, and the plurality of second interfaces are connected one-to-one with the plurality of first interfaces, so as to realize the docking of the first flexible printed circuit board and the PCB board; each first circuit is located on the front or back side of the PCB board to connect the corresponding second interface and the third interface, and each second circuit is arranged on the front and back sides of the PCB board through the through hole to connect the staggered second interface and the third interface. In this way, for the case where the interface of the first flexible circuit board does not correspond to the interface of the BMS, a through hole is set at the position of the second interface, and the second circuit passes through the through hole after being connected to the interface, so as not to reach the other side of the PCB board, and then passes through the through hole corresponding to the third interface to connect to the third interface, so as to solve the crossing problem.

[0020] Since the PCB board has a certain thickness, the inner wall area of ​​the through hole is larger, which can attach more materials. In this way, the size of the second circuit located in the through hole is relatively larger, with better strength and reliability, which can improve the conductivity and service life.

[0021] In the prior art, the second circuit on the double-sided flexible printed circuit board is formed by a copper plating process. Since the through-hole thickness is relatively thin, the copper plating process is relatively difficult. In the present invention, the through-hole depth of the PCB board is large and the inner wall area is large, which makes copper plating more convenient and reduces the difficulty of the copper plating process.

[0022] After the first flexible printed circuit board forms an integrated busbar and is installed on the battery module, the position of the circuit board body corresponds to the battery cell of the module. This position is affected by the expansion of the battery cell and will exert a pulling force on the first flexible printed circuit board. Since the PCB board is arranged on the outside of the first flexible printed circuit board, this position is not located in the expansion area of ​​the module battery cell. In this way, the second circuit in the through hole is prevented from being pulled due to the expansion of the battery cell, which reduces the service life or even causes damage. It can also avoid damage to the PCB board. At the same time, it can avoid interference between the PCB board and the first flexible printed circuit board during assembly, which can damage the electronic components on the PCB board.

[0023] The PCB board is not arranged in the battery cell expansion area and also has a relatively stronger structural strength. Therefore, there is no need to arrange a reinforcing structure at the through hole position as in the prior art, and the structure is simple and the cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0026] Figure 3 It is a three-dimensional structural schematic diagram of the battery information collection structure of Example 1;

[0027] Figure 4 for Figure 3 A schematic diagram of a partial three-dimensional decomposition structure of a battery information collection structure;

[0028] Figure 5 It is a structural diagram of the PCB board;

[0029] Figure 6 It is another three-dimensional structural schematic diagram of the battery information collection structure of Example 1;

[0030] Figure 7 for Figure 6 A schematic diagram of a partial three-dimensional decomposition structure of a battery information collection 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 circuit 212; second circuit 213; through hole 214; second output terminal 220; third interface 221;

[0033] Connector 300;

[0034] A second flexible printed circuit board 400;

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

[0036] Aluminum bar 600;

[0037] Battery module housing 700. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example 1

[0040] A battery information collection structure, see Figure 3-Figure 5 The invention comprises a first flexible printed circuit board 100, a PCB board 200 and a connector 300, wherein the first flexible printed circuit board 100 comprises an integrally formed circuit board body 110 and a connecting arm 120, wherein the connecting arm 120 is located outside the circuit board body 110, one end of the connecting arm 120 is connected to the end of the circuit board body 110, and the other end of the connecting arm 120 is provided with a first output terminal, wherein the first output terminal is provided with a plurality of first interfaces, and the PCB board 200 is provided with a first input terminal 210, a plurality of first lines 212, at least one second line 213, a through hole 214 and a second output terminal 220, wherein the first input terminal 210 and the second output terminal 220 are respectively provided with a plurality of second interfaces 211 and a plurality of third interfaces 221, wherein the plurality of second interfaces 211 are connected to the plurality of first interfaces one by one. Corresponding connections are made, so that the first flexible printed circuit board 100 and the PCB board 200 are connected to each other; each first line 212 is located on the front or back side of the PCB board 200 to connect the corresponding second interface 211 and the third interface 221, and each second line 213 is arranged on the front and back sides of the PCB board 200 through the through hole 214 to connect the staggered second interface 211 and the third interface 221. In this way, for the case where the first flexible circuit board interface does not correspond to the BMS interface, a through hole 214 is set at the position of the second interface 211. After the second line 213 is connected to the interface, it passes through the through hole 214 without going to the other side of the PCB board 200, and then passes through the through hole 214 corresponding to the third interface 221 to connect with the third interface 221 to solve the crossing problem.

[0041] In addition to solving the line crossing problem caused by the flexible printed circuit boards sharing one BMS, the battery information collection structure of this embodiment also has the following advantages:

[0042] First, since the PCB board 200 has a certain thickness, the inner wall area of ​​the through hole 214 is larger, which can attach more materials. In this way, the size of the second circuit 213 located in the through hole 214 is relatively larger, with better strength and reliability, which can improve the conductivity and 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 through hole 214 is relatively thin, the copper plating process is relatively difficult. In the present invention, the second circuit 213 is also formed by a copper plating process. The through hole 214 of the PCB board 200 has a large depth and a large inner wall area, which makes it easier to copper plate and reduces the difficulty of the copper plating process.

[0044] Third, after the first flexible printed circuit board 100 forms an integrated busbar and is installed on the battery module, the position of the circuit board body 110 corresponds to the battery cell of the module. This position is affected by the expansion of the battery cell and will exert a pulling force on the first flexible printed circuit board 100. Since the PCB board 200 is arranged outside the first flexible printed circuit board 100, this position is not located in the expansion area of ​​the module battery cell. In this way, the second circuit 213 in the through hole 214 is prevented from being pulled due to the expansion of the battery cell, which reduces the service life or even causes damage, and can also avoid damage to the PCB board 200. At the same time, it can prevent the PCB board 200 from interfering with the first flexible printed circuit board 100 during assembly, thereby damaging the electronic components on the PCB board 200.

[0045] Fourthly, the PCB board 200 is not arranged in the cell expansion area and also has a relatively stronger structural strength. Therefore, there is no need to arrange a reinforcing structure at the position of the through hole 214 as in the prior art, which simplifies the structure and reduces the cost.

[0046] In this embodiment, the second output terminal 220 is electrically connected to the connector 300 , and the contacts on the connector 300 correspond one-to-one and are identical to the contacts on the BMS, and are used to be electrically connected to a common battery management system.

[0047] In this embodiment, a buffer arm 111 is provided on the circuit board body 110, and the free end of the buffer arm 111 is a collection end for connecting with the aluminum bar 600. Among them, the buffer arm 111 structure can adopt an existing shape, such as an S-shaped shape, so as to alleviate the influence of the expansion of the battery cell on the connection reliability between the nickel sheet and the aluminum bar 600. In practice, the buffer arm 111 is small in size, low in strength, and easily damaged by pulling. In this embodiment, the PCB board 200 and the connector 300 are both located outside the first flexible printed circuit board 100, and they are in a drooping state when forming an integrated busbar assembly. 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 installed on the PCB board 200, but the increase in the size of the PCB board 200 will increase its weight; after the connector 300 is connected to the PCB board 200, the weight of the two is superimposed, the overall weight is greater, and the greater the gravity, this will generate a larger pulling force, thereby pulling the buffer arm 111 close to the PCB board 200 and causing damage. To this end, in this embodiment, a second flexible printed circuit board 400 is further provided between the PCB board 200 and the connector 300 to electrically connect the two together. With such a configuration, the connector 300 can be directly connected to the BMS using the second flexible printed circuit board 400, and the connector 300 is connected and fixed to the BMS. At this time, the structure that applies tension to the buffer arm 111 is only the PCB board 200. Since the gravity providing the tension is reduced, the tension on the buffer arm 111 is reduced, which reduces damage to the buffer arm 111. The second flexible printed circuit board 400 has the characteristics of being bendable and winding, and can be operated and connected more flexibly when connecting the connector 300.

[0048] In this embodiment, the PCB board 200 can be selected as a single-sided PCB board 200. The single-sided PCB board 200 has the following advantages: since the first interface and the third interface 221 at both ends of the first circuit 212 on the PCB board 200 are connected one by one, all the first circuits 212 can be arranged on one side of the PCB board 200, such as the front side; in the second circuit 213, since the corresponding second interface 211 and the third interface 221 are staggered, through holes 214 are set at the corresponding second interface 211 and the third interface 221. When copper is plated, the copper wire passes through the through hole 214 and is arranged on the back side of the PCB board 200. Since no other circuits are set on the back side, there is no need to consider the wiring problem, and the design is simpler and has high versatility. However, the single-sided PCB board 200 is large in size and heavy in weight, which still has a certain impact on the buffer arm 111. Therefore, in this embodiment, the PCB board 200 is a double-sided PCB board 200, part of the first circuit 212 is arranged on the front side of the PCB board 200, and the other part of the first circuit 212 is arranged on the front side of the PCB board 200, and the two interfaces of the second circuit 213 are still connected through the interface. The first circuit 212 is arranged on both sides of the double-sided PCB board 200, which can reduce its size, reduce weight, and reduce the impact on the buffer arm 111. After using the double-sided PCB board 200, the wiring of the second circuit 213 can be arranged according to actual needs, and will not be repeated here.

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

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

[0051] In this embodiment, the connecting arm 120 is bent horizontally inward to form a first connecting arm 121, the lateral connecting arm is bent toward the side away from the circuit board body 110 to form a second connecting arm 122, and the second connecting arm is bent vertically downward to form a third connecting arm 123, and the third connecting arm is folded in half and connected to the front and back sides of the PCB board 200. Foam 124 is provided at the bottom of the first connecting arm and the second connecting arm. The foam 124 can not only insulate and heat-insulate the connecting arm and the battery module, but also play a buffering role for the connecting arm. In addition, when the PCB board 200 is in a drooping state, the position relative to the corner of the battery module housing 700 can be protected to avoid the problem of whitening and damage of the circuit due to long-term contact with the corner of the battery module housing.

[0052] In this 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 this embodiment forms an integrated busbar, its PCB board 200 is in a drooping state. In other practical methods, see Figure 6-Figure 7 The battery information collection structure also includes a protective seat 500, and the above-mentioned PCB board 200 is installed in the protective seat 500. The protective seat 500 is installed on the battery module housing, so that the PCB board 200 is fixed on the battery module housing, which completely solves the problem of the gravity of the PCB board 200 pulling the buffer arm 111. The PCB board 200 is installed in the protective shell, which also plays a dust-proof role, and can also prevent the electronic components on the PCB board 200 from being damaged by friction with the outside world. The material of the protective seat 500 is an insulating protective material, which can insulate and insulate the PCB board 200 and the battery module housing (generally a metal material), reduce the influence of the heat radiated from the battery module housing on the electronic components on the PCB board 200, and avoid leakage causing damage to the electronic components on the PCB board 200.

[0054] Of course, it is understandable that although the fixing base 510 can fix the PCB board 200, compared with the previous implementation of this embodiment, it is necessary to manufacture more fixing bases 510 and assemble them at the same time, and the process steps and costs are relatively higher.

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

[0056] Example 2

[0057] An integrated busbar comprises a bracket (not shown in the figure), an aluminum bar arranged on the bracket, and a battery information collection structure, wherein the battery information collection structure is the battery information collection structure of Example 1.

[0058] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A battery information collection structure, characterized in that: It includes a first flexible printed circuit board, a PCB board and a connector. The first flexible printed circuit board includes an integrally formed circuit board body and a connecting arm. The connecting arm is located on the outside of the circuit board body. One end of the connecting arm is connected to the end of the circuit board body. 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 circuits, at least one second circuit, 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 to the plurality of first interfaces in a one-to-one correspondence. Each first circuit is located on the front or back of the PCB board so as to connect the corresponding second interface and the third interface. Each second circuit is arranged on the front and back of the PCB board through the through hole so as to connect the staggered second interface and the third interface. The second output terminal is electrically connected to the connector. The connector is used to be electrically connected to a common battery management system.

2. The battery information collection structure according to claim 1, characterized in that: The circuit board body is provided with a buffer arm, and the free end of the buffer arm is a collection end for connecting with the aluminum bar; A second flexible printed circuit board is provided between the PCB board and the connector to electrically connect the two together.

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

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

5. The battery information collection structure according to claim 4, characterized in that: The circuit board body is U-shaped.

6. The battery information collection structure according to claim 4, characterized in that: The connecting arm is bent horizontally inward to form a first connecting arm, the transverse connecting arm is bent toward a side away from the circuit board body to form a second connecting arm, the second connecting arm is bent vertically downward to form a third connecting arm, and an end of the third connecting arm is electrically connected to the PCB board; Foam is provided at the bottom of the first connecting arm and the second connecting arm.

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

8. The battery information collection structure according to claim 1, characterized in that: It also includes a protective seat, which is installed on the battery module shell. The PCB board is installed in the protective seat, and the material of the protective seat is insulating protective material.

9. The battery information collection structure according to claim 8, characterized in that: The protective seat comprises a fixing seat and a cover body, the fixing seat is provided with an installation cavity for installing a PCB board, and the cover body covers the installation cavity.

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

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