Battery protection board, battery and electric device

Abstract

The utility model provides a battery protection board, a battery and an electric device, and relates to the field of batteries. The battery protection board comprises a printed circuit board and a flexible circuit board; the printed circuit board is provided with a positive electrode interface, a piece distribution area and a negative electrode interface which are distributed at intervals in the length direction of the printed circuit board. The flexible circuit board comprises a first flexible board and a second flexible board which are oppositely arranged, and the end, close to the positive electrode interface, of the printed circuit board is located between the first flexible board and the second flexible board and electrically connected with the first flexible board and the second flexible board; the anode interface is connected with the anode of the first soft board to form a first anode loop, and the cathode of the first soft board, the piece distribution area and the cathode interface are connected to form a first cathode loop; the anode interface is connected with the anode of the second soft board to form a second anode loop, and the cathode of the second soft board, the piece distribution area and the cathode interface are connected to form a second cathode loop. The battery protection board provided by the utility model solves the technical problem of high cost of the battery protection board in the prior art.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a battery protection board, a battery, and an electrical device. Background Technology

[0002] A battery protection circuit module (PCM) is a crucial component that protects batteries from damage caused by overcharging, over-discharging, and short circuits. PCMs include flexible printed circuit boards (FPCs) and printed circuit boards (PCBs).

[0003] See Figure 1 In the existing technology, a single printed circuit board is paired with two flexible circuit boards, which are soldered to the left and right ends of the printed circuit board respectively. This results in a large number of electronic components and high cost. Utility Model Content

[0004] The purpose of this application is to provide a battery protection board, a battery, and an electrical device to alleviate the technical problem of high cost of battery protection boards in the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] Firstly, the battery protection board provided by this utility model includes a printed circuit board and a flexible circuit board;

[0007] The printed circuit board is provided with positive interfaces, a component area and negative interfaces that are spaced apart along its length.

[0008] The flexible circuit board includes a first flexible board and a second flexible board disposed opposite to each other. One end of the printed circuit board near the positive terminal interface is located between the first flexible board and the second flexible board and is electrically connected to the first flexible board and the second flexible board.

[0009] The positive terminal interface is connected to the positive terminal of the first flexible circuit board to form a first positive terminal circuit, and the negative terminal of the first flexible circuit board, the fabric area and the negative terminal interface are connected to form a first negative terminal circuit; the positive terminal interface is connected to the positive terminal of the second flexible circuit board to form a second positive terminal circuit, and the negative terminal of the second flexible circuit board, the fabric area and the negative terminal interface are connected to form a second negative terminal circuit.

[0010] Furthermore, the flexible circuit board also includes a bending portion, which is connected to the side of the first flexible board and the side of the second flexible board, respectively.

[0011] Furthermore, the bent portion of the flexible circuit board extends along the length direction of the printed circuit board.

[0012] Furthermore, the bent portion of the flexible circuit board extends along the width direction of the printed circuit board.

[0013] Furthermore, the printed circuit board has a first connecting pad and a second connecting pad at one end near the positive terminal interface;

[0014] The first flexible circuit board is provided with a third connecting plate, and the second flexible circuit board is provided with a fourth connecting plate;

[0015] The first connecting plate is connected to the third connecting plate, and the second connecting plate is connected to the fourth connecting plate.

[0016] Furthermore, the first connecting plate is welded to the third connecting plate, and / or the second connecting plate is welded to the fourth connecting plate.

[0017] Furthermore, the flexible circuit board also includes at least one connector, which is mounted on the first flexible circuit board or the second flexible circuit board.

[0018] Furthermore, the flexible circuit board also includes a support sheet, with the support sheet and the connector located on opposite sides of the flexible circuit board, respectively.

[0019] Secondly, the battery provided by this utility model includes a battery protection board as described in any of the above claims.

[0020] Thirdly, the electrical device provided by this utility model includes the battery as described above.

[0021] Based on the above technical solutions, the technical effects achievable by this utility model can be analyzed as follows:

[0022] The battery protection board provided by this utility model includes a printed circuit board and a flexible circuit board. The printed circuit board is provided with a positive electrode interface, a component area and a negative electrode interface distributed at intervals along its length. The flexible circuit board includes a first flexible board and a second flexible board arranged opposite to each other. The end of the printed circuit board near the positive electrode interface is located between the first flexible board and the second flexible board and is electrically connected to the first flexible board and the second flexible board. The positive electrode interface is connected to the positive electrode of the first flexible board to form a first positive electrode circuit, and the negative electrode, component area and negative electrode interface of the first flexible board are connected to form a first negative electrode circuit. The positive electrode interface is connected to the positive electrode of the second flexible board to form a second positive electrode circuit, and the negative electrode, component area and negative electrode interface of the second flexible board are connected to form a second negative electrode circuit.

[0023] In the prior art, the connection between the printed circuit board and two flexible circuit boards requires that the positive terminal of the flexible circuit board located at one end of the printed circuit board be connected to the positive interface of the printed circuit board to form a third positive circuit, and the negative terminal be connected to the negative interface after passing through the component area of ​​the printed circuit board to form a third negative circuit; the positive terminal of the flexible circuit board located at the other end of the printed circuit board requires that be connected to the positive interface of the printed circuit board to form a fourth positive circuit, and the negative terminal be connected to the negative interface after passing through the component area of ​​the printed circuit board to form a fourth negative circuit. Based on the principle of a single variable, and without changing the component placement area on the printed circuit board, the material, shape, and size of the printed circuit board, or the material and shape of the flexible circuit board, compared to the aforementioned prior art, the length of the first positive circuit is the same as the length of the third positive circuit, and the length of the first negative circuit is the same as the length of the third negative circuit. Because the first and second flexible circuits are located at the same end of the printed circuit board, the length of the second positive circuit is less than the length of the fourth positive circuit, and the length of the second negative circuit is less than the length of the fourth negative circuit. Therefore, the positive and negative (charge and discharge) return circuits of this battery protection board are shorter than those of the prior art, thereby reducing internal resistance and increasing overcurrent capacity.

[0024] In addition, the first and second flexible circuit boards of the flexible circuit board of the battery protection board are electrically connected to the same end of the printed circuit board, so that the first positive circuit, the first negative circuit, the second positive circuit and the second negative circuit are all on one side of the printed circuit board. This avoids the problem in the prior art where there are positive and negative circuits on both sides of the printed circuit board, which requires the printed circuit board to have multiple layers to carry large currents. This can reduce the number of layers of the printed circuit board and reduce the cost of the battery protection board. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a battery protection board in the prior art;

[0027] Figure 2 A front view of the battery protection board provided in an embodiment of this application;

[0028] Figure 3 A rear view of the battery protection board provided in an embodiment of this application;

[0029] Figure 4 A front view of the flexible circuit board in the battery protection board provided in the embodiments of this application;

[0030] Figure 5 A back view of the flexible circuit board in the battery protection board provided in the embodiments of this application;

[0031] Figure 6 A front view of the printed circuit board in the battery protection board provided in the embodiments of this application;

[0032] Figure 7 This is a back view of the printed circuit board in the battery protection board provided in an embodiment of this application.

[0033] icon:

[0034] 100 - Printed circuit board; 110 - Positive interface; 120 - Fabrication area; 130 - Negative interface; 140 - First connection tray; 150 - Second connection tray;

[0035] 200 - Flexible circuit board; 210 - Connector; 220 - First flexible board; 221 - Third connecting plate; 230 - Second flexible board; 231 - Fourth connecting plate; 250 - Support piece; 240 - Bending section;

[0036] A1 - First positive circuit; B1 - First negative circuit; A2 - Second positive circuit; B2 - Second negative circuit; A3 - Third positive circuit; B3 - Third negative circuit; A4 - Fourth positive circuit; B4 - Fourth negative circuit. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0038] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0039] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] Example 1

[0041] The battery protection board provided in this embodiment of the utility model includes a printed circuit board 100 and a flexible circuit board 200. The printed circuit board 100 is provided with a positive electrode interface 110, a fabrication area 120 and a negative electrode interface 130 distributed at intervals along its length. The flexible circuit board 200 includes a first flexible board 220 and a second flexible board 230 disposed opposite to each other. One end of the printed circuit board 100 near the positive electrode interface 110 is located between the first flexible board 220 and the second flexible board 230 and is electrically connected to the first flexible board 220 and the second flexible board 230. The positive electrode interface 110 is connected to the positive electrode of the first flexible board 220 to form a first positive electrode circuit A1. The negative electrode of the first flexible board 220, the fabrication area 120 and the negative electrode interface 130 are connected to form a first negative electrode circuit B1. The positive electrode interface 110 is connected to the positive electrode of the second flexible board 230 to form a second positive electrode circuit A2. The negative electrode of the second flexible board 230, the fabrication area 120 and the negative electrode interface 130 are connected to form a second negative electrode circuit B2.

[0042] See Figure 1 , Figure 1 This is a schematic diagram of a battery protection board in the prior art. In the prior art, the connection between the printed circuit board 100 and two flexible circuit boards 200 involves the following: the positive terminal of the flexible circuit board 200 located at one end of the printed circuit board 100 needs to be connected to the positive interface 110 of the printed circuit board 100 to form a third positive circuit A3; the negative terminal needs to pass through the placement area 120 of the printed circuit board 100 and then connect to the negative interface 130 to form a third negative circuit B3. Similarly, the positive terminal of the flexible circuit board 200 located at the other end of the printed circuit board 100 needs to be connected to the positive interface 110 of the printed circuit board 100 to form a fourth positive circuit A4; the negative terminal needs to pass through the placement area 120 of the printed circuit board 100 and then connect to the negative interface 130 to form a fourth negative circuit B4. See also... Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the top surface of the printed circuit board 100 in the battery protection board in this embodiment. Figure 3This is a schematic diagram of the BOT side of the printed circuit board 100 in the battery protection board of this embodiment. According to the principle of a single variable, the component placement area of ​​the printed circuit board in the prior art is consistent with the component placement area 120 of the printed circuit board 100 in this embodiment, to avoid the component placement area 120 affecting the accuracy of the comparative experiment. By comparing the connectivity of the circuits in the above figures, compared to the prior art, the length of the first positive circuit A1 is consistent with the length of the third positive circuit A3, and the length of the first negative circuit B1 is consistent with the length of the third negative circuit B3. Because the first flexible board 220 and the second flexible board 230 are located at the same end of the printed circuit board 100, the length of the second positive circuit A2 is less than the length of the fourth positive circuit A4, and the length of the second negative circuit B2 is less than the length of the fourth negative circuit B4. Therefore, the positive and negative (charge / discharge) return current of this battery protection board is shorter than that of the prior art, thereby reducing internal resistance and increasing overcurrent capacity.

[0043] In addition, the first flexible board 220 and the second flexible board 230 of the flexible circuit board 200 of the battery protection board are electrically connected to the same end of the printed circuit board 100, so that the first positive circuit A1, the first negative circuit B1, the second positive circuit A2 and the second negative circuit B2 are all on one side of the printed circuit board 100. This avoids the problem in the prior art where there are positive and negative circuits on both sides of the printed circuit board 100, which requires the printed circuit board 100 to have multiple layers to carry large currents. This can reduce the number of layers of the printed circuit board 100 and reduce the cost of the battery protection board.

[0044] The structure and shape of the battery protection board are described in detail below:

[0045] In the optional embodiments of this utility model, see Figure 4 and Figure 5 The flexible circuit board 200 also includes a bending portion 240, which is connected to the side of the first flexible board 220 and the side of the second flexible board 230 respectively.

[0046] Specifically, the flexible circuit board 200 is bent along the bending portion 240 to form a first flexible board 220 and a second flexible board 230.

[0047] The flexible circuit board 200 is bent to form a first flexible board 220 and a second flexible board 230. Compared with two separate flexible boards, the internal resistance difference between the first flexible board 220 and the second flexible board 230 is small, avoiding the problem of large internal resistance differences between various circuits.

[0048] In an optional embodiment of this utility model, the bent portion 240 of the flexible circuit board 200 extends along the length direction of the printed circuit board 100.

[0049] Specifically, the main bodies of both the first flexible printed circuit board 220 and the second flexible printed circuit board 230 are rectangular, and one side of the bent portion 240 is connected to one long side of the first flexible printed circuit board 220, and the other side is connected to one long side of the second flexible printed circuit board 230. Furthermore, the length of the first flexible printed circuit board 220 is greater than the length of the second flexible printed circuit board 230, which facilitates the placement of more devices or port connection structures on the first flexible printed circuit board 220 for connection with other electronic devices. Alternatively, the length of the first flexible printed circuit board 220 may be less than the length of the second flexible printed circuit board 230; or the lengths of the first flexible printed circuit board 220 and the second flexible printed circuit board 230 may be equal, all of which should be within the protection scope of this utility model embodiment.

[0050] The bending portion 240 extends along the length of the printed circuit board 100, so that the flexible circuit board 200 can be connected to the same end of the printed circuit board 100 after bending.

[0051] In an optional embodiment of this utility model, the bent portion 240 of the flexible circuit board 200 extends along the width direction of the printed circuit board 100.

[0052] Specifically, both the first flexible board 220 and the second flexible board 230 are rectangular. One side of the bent portion 240 is connected to the short side of the first flexible board 220, and the other side is connected to the short side of the second flexible board 230. The length of the first flexible board 220 is equal to the length of the second flexible board 230.

[0053] The bending portion 240 extends along the width direction of the printed circuit board 100, so that the flexible circuit board 200 can be connected to the same end of the printed circuit board 100 after bending.

[0054] In the optional embodiments of this utility model, see Figures 4 to 7 The printed circuit board 100 is provided with a first connecting plate 140 and a second connecting plate 150 at one end near the positive terminal interface 110; the first flexible board 220 is provided with a third connecting plate 221, and the second flexible board 230 is provided with a fourth connecting plate 231; the first connecting plate 140 is connected to the third connecting plate 221, and the second connecting plate 150 is connected to the fourth connecting plate 231.

[0055] Specifically, in this embodiment, a first connecting plate 140 and a second connecting plate 150 are respectively provided on two opposite sides of the printed circuit board 100 near the positive terminal interface 110, with the positions of the first connecting plate 140 and the second connecting plate 150 opposite to each other. Of course, the first connecting plate 140 and the second connecting plate 150 being located on the same side of the printed circuit board 100 should also be within the protection scope of this utility model embodiment.

[0056] The first connecting plate 140 is connected to the third connecting plate 221 to connect the first flexible board 220 to the printed circuit board 100; the second connecting plate 150 is connected to the fourth connecting plate 231 to connect the second flexible board 230 to the printed circuit board 100.

[0057] In an optional embodiment of this utility model, the first connecting plate 140 is welded to the third connecting plate 221, and / or the second connecting plate 150 is welded to the fourth connecting plate 231.

[0058] Specifically, the first connecting plate 140 is welded to the third connecting plate 221; or, the second connecting plate 150 is welded to the fourth connecting plate 231; or, the first connecting plate 140 is welded to the third connecting plate 221, and the second connecting plate 150 is welded to the fourth connecting plate 231. The first connecting plate 140, the second connecting plate 150, the third connecting plate 221, and the fourth connecting plate 231 are all configured as solder pads. Of course, the first connecting plate 140 being snap-fitted and connected to the third connecting plate 221, and the second connecting plate 150 being snap-fitted and connected to the fourth connecting plate 231, etc., should all be within the protection scope of this utility model embodiment.

[0059] The first connecting plate 140 is welded to the third connecting plate 221 to connect the first flexible board 220 to the printed circuit board 100; the second connecting plate 150 is welded to the fourth connecting plate 231 to connect the second flexible board 230 to the printed circuit board 100.

[0060] In an optional embodiment of this utility model, the flexible circuit board 200 further includes at least one connector 210, which is mounted on the first flexible board 220 or the second flexible board 230.

[0061] Specifically, in this embodiment, the flexible circuit board 200 includes two connectors 210, both of which are mounted on the first flexible circuit board 220. Of course, both connectors 210 can be mounted on the second flexible circuit board 230; or one connector 210 can be mounted on the first flexible circuit board 220 and the other connector 210 on the second flexible circuit board 230, both of which should be within the protection scope of this utility model embodiment. Referring to the figure, current flows from the negative terminal interface 130 of the printed circuit board 100 through the inner layer of the printed circuit board 100, through the power devices in the component area 120, to the solder pad on the left side, and then from the connection position into the flexible circuit board 200, thereby splitting the current into two connectors 210.

[0062] Connector 210 enables the connection of the battery protection board with other electronic devices.

[0063] In an optional embodiment of this utility model, the flexible circuit board 200 further includes a support piece 250, and the support piece 250 and the connector 210 are located on both sides of the flexible circuit board 200.

[0064] Specifically, the support piece 250 is made of steel.

[0065] The support piece 250 is used to support the reinforced flexible circuit board 200.

[0066] The advantages of this battery protection board are explained in detail below:

[0067] The battery protection board includes a printed circuit board 100 and a flexible circuit board 200. The flexible circuit board 200 includes a connector 210 that can be fastened to the host, a third connecting plate 221, and a fourth connecting plate 231. The TOP and BOT sides of the same end of the printed circuit board 100 have the same first connecting plate 140 and second connecting plate 150. After the flexible circuit board 200 is bent, the first connecting plate 140 of the printed circuit board 100 corresponds to and is connected to the third connecting plate 221 of the flexible circuit board 200, and the second connecting plate 150 corresponds to and is connected to the fourth connecting plate 231. The same network can be connected through the flexible circuit board 200, thereby reducing the number of layers of the printed circuit board 100 for cost reduction.

[0068] Example 2

[0069] The battery provided in this embodiment includes the battery protection board described in Embodiment 1, and therefore also possesses all the beneficial effects of Embodiment 1, which will not be repeated here.

[0070] Example 3

[0071] The electrical device provided in this embodiment includes the battery described in Embodiment 2, and therefore also possesses all the beneficial effects of Embodiment 2, which will not be repeated here.

[0072] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0073] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery protection board, characterized in that, include: Printed circuit board (100) and flexible circuit board (200); The printed circuit board (100) is provided with a positive terminal interface (110), a component area (120) and a negative terminal interface (130) spaced apart along its length. The flexible circuit board (200) includes a first flexible board (220) and a second flexible board (230) disposed opposite to each other. The end of the printed circuit board (100) near the positive terminal interface (110) is located between the first flexible board (220) and the second flexible board (230) and is electrically connected to the first flexible board (220) and the second flexible board (230). The positive terminal interface (110) is connected to the positive terminal of the first flexible board (220) to form a first positive terminal circuit (A1), and the negative terminal of the first flexible board (220), the fabric area (120) and the negative terminal interface (130) are connected to form a first negative terminal circuit (B1); the positive terminal interface (110) is connected to the positive terminal of the second flexible board (230) to form a second positive terminal circuit (A2), and the negative terminal of the second flexible board (230), the fabric area (120) and the negative terminal interface (130) are connected to form a second negative terminal circuit (B2).

2. The battery protection board according to claim 1, characterized in that, The flexible circuit board (200) further includes a bending portion (240), which is connected to the side of the first flexible board (220) and the side of the second flexible board (230) respectively.

3. The battery protection board according to claim 2, characterized in that, The bent portion (240) of the flexible circuit board (200) extends along the length direction of the printed circuit board (100).

4. The battery protection board according to claim 2, characterized in that, The bent portion (240) of the flexible circuit board (200) extends along the width direction of the printed circuit board (100).

5. The battery protection board according to any one of claims 1-4, characterized in that, The printed circuit board (100) has a first connecting plate (140) and a second connecting plate (150) at one end near the positive terminal interface (110); The first flexible board (220) is provided with a third connecting plate (221), and the second flexible board (230) is provided with a fourth connecting plate (231); The first connecting plate (140) is connected to the third connecting plate (221), and the second connecting plate (150) is connected to the fourth connecting plate (231).

6. The battery protection board according to claim 5, characterized in that, The first connecting plate (140) is welded to the third connecting plate (221), and / or the second connecting plate (150) is welded to the fourth connecting plate (231).

7. The battery protection board according to claim 1, characterized in that, The flexible circuit board (200) further includes at least one connector (210), which is mounted on the first flexible board (220) or the second flexible board (230).

8. The battery protection board according to claim 7, characterized in that, The flexible circuit board (200) also includes a support piece (250), and the support piece (250) and the connector (210) are located on both sides of the flexible circuit board (200).

9. A battery, characterized in that, Includes the battery protection board as described in any one of claims 1-8.

10. An electrical device, characterized in that, Includes the battery as described in claim 9.

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