Battery protection board and electronic equipment

Abstract

The utility model discloses a battery protection board and electronic equipment, and belongs to the technical field of batteries, and the battery protection board comprises a flexible circuit board which is provided with a first surface and a second surface which are oppositely arranged in the thickness direction of the flexible circuit board; the first reinforcing part is stacked on the first surface; the first connecting piece is used for connecting a battery tab, and the first connecting piece is arranged on the second surface; the protection device is arranged on the flexible circuit board; the second connecting piece is used for being connected with the mainboard, and the second connecting piece is connected with the flexible circuit board; in the plane perpendicular to the thickness direction, at least part of the orthographic projection of the first connecting piece is located in the orthographic projection of the first reinforcing piece; the thickness a of the flexible circuit board and the thickness a of the first reinforcing piece in the thickness direction meet the condition that a is larger than or equal to 0.3 mm and smaller than or equal to 0.6 mm. The thickness of the whole battery protection plate is reduced, and the occupied space is reduced.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery protection board and an electronic device. Background Art

[0002] The battery protection board is a core protection component to prevent problems such as overcharging, over-discharging, over-current, short circuit, and ultra-high temperature charging and discharging of the battery. Generally, it is directly installed at the end of the battery. Since the installation space for the battery in the electronic device is limited and the battery protection board needs to integrate multiple components, higher requirements are put forward for the structural design of the battery protection board. Utility Model Content

[0003] Utility Model Objective: The embodiments of this application provide a battery protection board, aiming to solve the above technical problems; another objective of this application is to provide an electronic device applying the above battery protection board.

[0004] Technical Solution: A battery protection board described in the embodiments of this application includes:

[0005] A flexible circuit board having a first surface and a second surface oppositely arranged along its thickness direction;

[0006] A first reinforcing member stacked on the first surface;

[0007] A first connecting member for connecting the battery tab, and the first connecting member is arranged on the second surface;

[0008] A protection device arranged on the flexible circuit board;

[0009] A second connecting member for connecting the main board, and the second connecting member connects the flexible circuit board;

[0010] Wherein, in a plane perpendicular to the thickness direction, at least part of the orthographic projection of the first connecting member is located within the orthographic projection of the first reinforcing member; the flexible circuit board and the first reinforcing member have a thickness a in the thickness direction, satisfying: 0.3 mm ≤ a ≤ 0.6 mm.

[0011] In some embodiments, the battery protection board further includes a second reinforcing member, and the second reinforcing member is stacked on the flexible circuit board in the thickness direction. In a plane perpendicular to the thickness direction, at least part of the orthographic projection of the protection device is located within the orthographic projection of the second reinforcing member.

[0012] In some embodiments, the flexible circuit board, the first reinforcing member, and the second reinforcing member have a thickness b in the thickness direction, satisfying: 0.3 mm ≤ b ≤ 0.6 mm.

[0013] In some embodiments, the protection device includes:

[0014] The first protection device is disposed on the first surface or the second surface, and the first protection device faces the second reinforcing member in the thickness direction;

[0015] The second protection device is disposed on the second surface, and the second protection device faces the first reinforcing member in the thickness direction.

[0016] In some embodiments, the protection device is disposed on the first surface or the second surface, and in a plane perpendicular to the thickness direction, the orthographic projection of the protection device is located within the orthographic projection of the second reinforcing member.

[0017] In some embodiments, the second connecting member is stacked on the second surface in the thickness direction.

[0018] In some embodiments, in the length direction of the flexible circuit board, the protection device is located between the first connecting member and the second connecting member.

[0019] In some embodiments, there are a plurality of the second connecting members, and the plurality of second connecting members are distributed along the length direction of the flexible circuit board.

[0020] In some embodiments, the battery protection board further includes a third reinforcing member, the third reinforcing member is stacked on the first surface in the thickness direction, and in a plane perpendicular to the thickness direction, at least a part of the orthographic projection of the second connecting member is located within the orthographic projection of the third reinforcing member.

[0021] Correspondingly, an electronic device according to an embodiment of the present application includes the above-mentioned battery protection board.

[0022] Beneficial effects: The battery protection board according to the embodiment of the present application includes a flexible circuit board, a first reinforcing member, a first connecting member, a protection device, and a second connecting member. The flexible circuit board has a first surface and a second surface that are oppositely arranged along its own thickness direction. The first reinforcing member is stacked on the first surface; the first connecting member is used to connect the battery tab and is disposed on the second surface. The protection device is disposed on the flexible circuit board, and the second connecting member is used to connect the main board and connect the flexible circuit board; in a plane perpendicular to the thickness direction, at least a part of the orthographic projection of the first connecting member is located within the orthographic projection of the first reinforcing member; the flexible circuit board and the first reinforcing member have a thickness a in the thickness direction, satisfying: 0.3 mm ≤ a ≤ 0.6 mm. By setting the main body of the battery protection board as a flexible circuit board, integrating the protection device on the flexible circuit board, improving the local structural stiffness of the flexible circuit board through the first reinforcing member, ensuring the connection stability between the first connecting member and the battery tab, and at the same time setting the overall thickness of the flexible circuit board and the first reinforcing member between 0.3 mm and 0.6 mm, it is beneficial to reduce the thickness of the overall battery protection board, thereby reducing the space occupation. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 is a schematic structural diagram of a battery protection board according to an embodiment of the present application;

[0025] Figure 2 is a schematic structural diagram of a battery protection board according to another embodiment of the present application;

[0026] Figure 3 is a schematic structural diagram of a battery protection board according to another embodiment of the present application;

[0027] Figure 4 is a schematic structural diagram of a battery protection board according to another embodiment of the present application;

[0028] Figure 5 is a schematic structural diagram of a battery protection board according to another embodiment of the present application;

[0029] Figure 6 is a schematic structural diagram of a battery protection board according to another embodiment of the present application;

[0030] Figure 7 is a schematic structural diagram of a battery protection board according to another embodiment of the present application;

[0031] Reference numerals: 1, flexible circuit board; 10, first side; 11, second side; 2, first reinforcing member; 3, first connecting member; 4, protection device; 40, first protection device; 41, second protection device; 5, second connecting member; 6, second reinforcing member; 7, third reinforcing member; X, thickness direction; Y, length direction. Detailed implementation manners

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application.

[0033] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, and at least one means it can be one, two, or more, unless otherwise specifically defined.

[0034] Currently, as one of the core protection components of the battery used in devices such as digital products, the battery protection board is mainly used to protect the safety of the battery during charging and discharging and other states. Usually, a PCB circuit board integrates various protection devices, and then connects to the main board of the device and the ear of the battery respectively.

[0035] However, currently, the structural thickness of the PCB circuit board itself is mostly above 1 mm. After adding electrical connection structures and protection devices, the thickness will further increase, which easily occupies more installation space inside the product, resulting in limited battery capacity of the device used and being unfavorable for increasing the battery endurance.

[0036] In view of this, combined with Figures 1 to 7 ,the embodiment of the present application provides a battery protection board, aiming to overcome at least one of the above technical problems.

[0037] Referring to Figures 1 to 7 ,a battery protection board includes a flexible circuit board 1, a first reinforcing member 2, a first connecting member 3, a protection device 4, and a second connecting member 5.

[0038] Among them, the flexible circuit board 1 has a first surface 10 and a second surface 11 which are oppositely arranged along its own thickness direction X. The first reinforcing member 2 is stacked on the first surface 10. The first connecting member 3 is arranged on the second surface 11 and is used to connect the battery ear. The protection device 4 is arranged on the flexible circuit board 1. The second connecting member 5 connects the flexible circuit board 1 and is used to connect the main board. In the plane perpendicular to the thickness direction X, at least part of the orthographic projection of the first connecting member 3 is located within the orthographic projection of the first reinforcing member 2. The flexible circuit board 1 and the first reinforcing member 2 have a thickness a in the thickness direction X, satisfying: 0.3 mm ≤ a ≤ 0.6 mm.

[0039] Specifically, a can be any one of 0.3mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.4mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm, 0.5mm, 0.51mm, 0.52mm, 0.53mm, 0.54mm, 0.55mm, 0.56mm, 0.57mm, 0.58mm, 0.59mm, 0.6mm or a range value composed of any two of them.

[0040] It should be noted that in each embodiment of the present application, an intersecting thickness direction X and length direction Y are introduced. Among them, the thickness direction X is parallel to the overall thickness direction of the battery protection board in this embodiment, that is, parallel to the thickness direction of the flexible circuit board 1, and the length direction Y is parallel to the overall length direction of the battery protection board in this embodiment.

[0041] Refer to Figures 1 to 7 , the first connecting members 3 include a plurality of them, and the plurality of first connecting members 3 are spaced apart along the length direction Y, and at least two of the first connecting members 3 are connected to battery tabs with different polarities.

[0042] In this embodiment, the first reinforcing member 2 can be made of a sheet structure made of fiberglass material, metal material, etc. In order to ensure the stability of each first connecting member 3 connecting the corresponding tab, in this embodiment, the orthographic projection of each first connecting member 3 in the plane perpendicular to the thickness direction X is located within the orthographic projection of the first reinforcing member 2 in the plane perpendicular to the thickness direction X.

[0043] In other embodiments, the coverage range of the first reinforcing member 2 can also be flexibly adjusted to meet the structural strength requirements.

[0044] It can be understood that in this embodiment, the protection device 4 can be devices such as a protection chip, a transistor, an encryption chip, a current detection resistor, etc. The protection device 4 can be an overall formed by the integrated packaging of multiple devices. The protection principle of the protection device 4 is prior art and will not be elaborated here.

[0045] By setting the main body of the battery protection board as the flexible circuit board 1, integrating the protection device 4 on the flexible circuit board 1, improving the local structural stiffness of the flexible circuit board 1 through the first reinforcing member 2, ensuring the connection stability between the first connecting member 3 and the battery tab, and at the same time setting the overall thickness of the flexible circuit board 1 and the first reinforcing member 2 between 0.3mm and 0.6mm, it is beneficial to reduce the thickness of the overall battery protection board, thereby reducing the space occupation.

[0046] In some embodiments, refer toFigure 1 The battery protection board further includes a second reinforcing member 6, which is stacked on the flexible circuit board 1 in the thickness direction X. In a plane perpendicular to the thickness direction X, at least a part of the orthographic projection of the protection device 4 is located within the orthographic projection of the second reinforcing member 6.

[0047] Specifically, the second reinforcing member 6 can be made of the same material as the first reinforcing member 2. To ensure the stability of each first connecting member 3 connecting the corresponding ear, in this embodiment, the orthographic projection of the protection device 4 in a plane perpendicular to the thickness direction X is entirely located within the orthographic projection of the second reinforcing member 6 in a plane perpendicular to the thickness direction X.

[0048] It should be noted that in some embodiments, referring to Figure 1 the second reinforcing member 6 is stacked on the first surface 10, and the protection device 4 is disposed on the second surface 11. At this time, since the second reinforcing member 6 is made of the same material as the first reinforcing member 2, the structural thicknesses of the first reinforcing member 2 and the second reinforcing member 6 are approximately the same, and the overall thickness change of the flexible circuit board 1, the first reinforcing member 2, and the second reinforcing member 6 compared to only setting the first reinforcing member 2 can be ignored.

[0049] In some embodiments, referring to Figure 3 the second reinforcing member 6 can also be disposed on the same side of the flexible circuit board 1 as the protection device 4. Figure 3 The second reinforcing member 6 shown in

[0050] is disposed on the second surface 11. It should be noted that at this time, the second reinforcing member 6 can be a substrate for encapsulating the protection device 4, and the protection device 4 can be multiple chips such as protection chips and encryption chips using COB (Chip-on-Board) packaging, and this substrate is the substrate for chip mounting. Figure 3 In some embodiments, referring to

[0051] the flexible circuit board 1, the first reinforcing member 2, and the second reinforcing member 6 have a thickness b in the thickness direction X, satisfying: 0.3 mm ≤ b ≤ 0.6 mm.

[0052] The first reinforcing member 2 and the second reinforcing member 6 are disposed on different sides of the flexible circuit board 1. To ensure the consistency of the overall thickness of the battery protection board, the value of b is also set between 0.3 mm and 0.6 mm to reduce the space occupied by the overall battery protection board.

[0053] In some embodiments, referring to Figures 2 to 7 , the second connecting member 5 is stacked on the second surface 11 in the thickness direction X. Relying on the flexible material characteristics of the flexible circuit board 1, the second connecting member 5 can be bent along with the flexible circuit board 1 to adaptively connect to the device main board.

[0054] In addition, to improve the structural stiffness of the region where the second connecting member 5 is disposed and enhance the stability of the connection between the second connecting member 5 and the main board, in some embodiments, referring to Figure 2 and Figure 5 , the battery protection board further includes a third reinforcing member 7. The third reinforcing member 7 is stacked on the first surface 10 in the thickness direction X. In a plane perpendicular to the thickness direction X, at least a part of the orthographic projection of the second connecting member 5 is located within the orthographic projection of the third reinforcing member 7. Specifically, in this embodiment, in a plane perpendicular to the thickness direction X, the orthographic projection of the second connecting member 5 coincides with the orthographic projection of the third reinforcing member 7. In other embodiments, the structures of the two can also be flexibly adjusted according to actual needs.

[0055] In addition, it can be understood that, in some embodiments, referring to Figures 5 to 7 , there may also be multiple second connecting members 5, and the multiple second connecting members 5 are distributed along the length direction Y of the flexible circuit board 1. In this embodiment, it is shown that the flexible circuit board 1 is connected with two second connecting members 5, and the two second connecting members 5 respectively correspond to the two ends of the flexible circuit board 1 in the length direction Y. As shown in Figure 1 , Figure 5 , Figure 6 and so on, in the length direction Y, the protection device 4 is located between the first connecting member 3 and the second connecting member 5. Corresponding to each second connecting member 5 on the flexible circuit board 1, a third reinforcing member 7 is provided.

[0056] In some embodiments, referring to Figure 4 and Figure 7 , two types of battery protection boards are respectively shown.

[0057] Among them, referring to Figure 4 , the protection device 4 includes a first protection device 40 and a second protection device 41. The first protection device 40 is disposed on the second surface 11, and the first protection device 40 is opposite to the second reinforcing member 6 in the thickness direction X. The second protection device 41 is disposed on the second surface 11, and the second protection device 41 is opposite to the first reinforcing member 2 in the thickness direction X.

[0058] Figure 7 The battery protection board shown inFigure 4 The differences are as follows: The first protection device 40 is disposed on the first surface 10, and the second protection device is disposed on the second surface 11. That is to say, the protection device 4 can be disposed not only on one surface of the flexible circuit board 1. At the same time, in the length direction Y, the positions of the protection devices 4 can also be adjusted flexibly, which will not be elaborated here. The first protection device 40 can be a protection chip, a transistor, etc., and the second protection device 41 can be an encryption chip, etc., which will not be elaborated here.

[0059] In addition, in some embodiments, referring to Figure 6 , the protection device 4 can also be wholly disposed on the first surface 10, and in the plane perpendicular to the thickness direction X, the orthographic projection of the protection device 4 is located within the orthographic projection of the second reinforcing member 6. In this embodiment, the orthographic projections of the two coincide, and in other embodiments, it can also be adjusted flexibly according to needs, which will not be elaborated here.

[0060] Correspondingly, an embodiment of the present application provides an electronic device, which includes the above-mentioned battery protection board. The electronic device can be a product such as a computer, a mobile phone, a digital camera, etc. It can be understood that the electronic device can have all the technical features and corresponding beneficial effects of the above-mentioned battery protection board, which will not be elaborated here.

[0061] The above has introduced in detail a battery protection board and an electronic device provided by the embodiments of the present application, and specific examples have been used to elaborate the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the technical solution and its core idea of the present application; those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery protection board, characterized in that, Comprising: A flexible circuit board (1) having a first surface (10) and a second surface (11) oppositely disposed along its own thickness direction (X); A first reinforcing member (2) stacked on the first surface (10); A first connecting member (3) for connecting a battery tab, the first connecting member (3) being disposed on the second surface (11); A protection device (4) disposed on the flexible circuit board (1); A second connecting member (5) for connecting to a main board, the second connecting member (5) connecting the flexible circuit board (1); Wherein, in a plane perpendicular to the thickness direction (X), at least a part of the orthographic projection of the first connecting member (3) is located within the orthographic projection of the first reinforcing member (2); the flexible circuit board (1) and the first reinforcing member (2) have a thickness a in the thickness direction (X), satisfying: 0.3 mm ≤ a ≤ 0.6 mm.

2. The battery protection board according to claim 1, wherein: The battery protection board further includes a second reinforcing member (6), the second reinforcing member (6) being stacked on the flexible circuit board (1) in the thickness direction (X), and in a plane perpendicular to the thickness direction (X), at least a part of the orthographic projection of the protection device (4) is located within the orthographic projection of the second reinforcing member (6).

3. The battery protection board according to claim 2, wherein: The flexible circuit board (1), the first reinforcing member (2) and the second reinforcing member (6) have a thickness b in the thickness direction (X), satisfying: 0.3 mm ≤ b ≤ 0.6 mm.

4. The battery protection board according to claim 2, wherein: The protection device (4) includes: A first protection device (40) disposed on the first surface (10) or the second surface (11), and the first protection device (40) is opposite to the second reinforcing member (6) in the thickness direction (X); A second protection device (41) disposed on the second surface (11), and the second protection device (41) is opposite to the first reinforcing member (2) in the thickness direction (X).

5. The battery protection board according to claim 2, wherein: The protection device (4) is disposed on the first surface (10) or the second surface (11), and in a plane perpendicular to the thickness direction (X), the orthographic projection of the protection device (4) is located within the orthographic projection of the second reinforcing member (6).

6. The battery protection board according to claim 2, wherein: The second connecting member (5) is stacked on the second surface (11) in the thickness direction (X).

7. The battery protection board according to claim 6, wherein: In the length direction (Y) of the flexible circuit board (1), the protection device (4) is located between the first connecting member (3) and the second connecting member (5).

8. The battery protection board according to claim 6, wherein: There are a plurality of the second connecting members (5), and the plurality of second connecting members (5) are distributed along the length direction (Y) of the flexible circuit board (1).

9. The battery protection board according to claim 6, wherein the battery protection board further includes a third reinforcing member (7), the third reinforcing member (7) is stacked on the first surface (10) in the thickness direction (X), and in a plane perpendicular to the thickness direction (X), at least a part of the orthographic projection of the second connecting member (5) is located within the orthographic projection of the third reinforcing member (7).

10. An electronic device, characterized in that, A battery protection board includes any one of the battery protection boards according to claims 1 to 9.

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