Battery protection board, battery and mobile terminal

Abstract

The utility model relates to the technical field of batteries, and provides a battery protection board, a battery and a mobile terminal. The flexible circuit board comprises a first surface and a second surface which are opposite to each other, a component assembly is arranged on the first surface, and a first through-flow circuit is correspondingly formed on the first surface; the hard circuit board is overlapped with the flexible circuit board and correspondingly arranged on the second surface of the flexible circuit board, a second through-flow circuit is arranged on the hard circuit board, at least the part, provided with the first through-flow circuit, of the flexible circuit board is projected to the hard circuit board, the first through-flow circuit is electrically connected with the second through-flow circuit, and the first through-flow circuit is electrically connected with the second through-flow circuit. And a main through-flow line is jointly formed. The first through-flow circuit is arranged on the flexible circuit board and is connected with the second through-flow circuit on the hard circuit board, and the hard circuit board and the flexible circuit board are arranged in a mutually overlapping manner, which is equivalent to correspondingly increasing the number of circuit layers of the main through-flow circuit, and can support the passage of larger current.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery protection board, a battery and a mobile terminal. Background Art

[0002] Battery protection boards are integrated circuits that protect rechargeable batteries and are widely used in a variety of electronic products. The battery cell, protection board, and battery pack are essential components of a rechargeable battery, ensuring its safety and reliability to a large extent.

[0003] In the existing technology, battery protection boards mainly adopt circuit boards in which soft boards and hard boards are welded together. Usually, control circuits are installed on the soft boards, and main flow circuits are set on the hard boards. However, the flow rate of the main flow circuit is currently difficult to meet the needs. By increasing the number of internal layers, the heat dissipation difficulty will be increased, and the defective rate of the structure will be increased. Utility Model Content

[0004] In view of this, the present invention provides a battery protection board, a battery and a mobile terminal to solve the problem that the flow rate of the current main current circuit is small and cannot meet the needs.

[0005] In the first aspect, the utility model provides a battery protection board, including: a component assembly; a flexible circuit board, including a first surface and a second surface relative to each other, the component assembly is arranged on the first surface, and a first current path is formed correspondingly; a hard circuit board is overlapped with the flexible circuit board and is correspondingly arranged on the second surface of the flexible circuit board, and a second current path is arranged thereon, the flexible circuit board is provided with at least a portion of the first current path, which is projected onto the hard circuit board, the first current path and the second current path are electrically connected, and are jointly formed into a main current path.

[0006] Beneficial effects:

[0007] From a structural perspective, a first current-passing circuit is set on the flexible circuit board and connected to the second current-passing circuit on the rigid circuit board. The rigid circuit board and the flexible circuit board are overlapped with each other, which is equivalent to increasing the number of circuit layers of the main current-passing circuit, and can support a larger current. At the same time, since the part of the flexible circuit board where the first current-passing circuit is set is projected onto the rigid circuit board, the rigid circuit board can support the flexible circuit board through its own rigid material, meeting the structural needs of stably setting the circuits and components constituting the first current-passing circuit thereon, and avoiding the separation of components and circuit boards.

[0008] In an optional embodiment, at least part of the control circuit is provided on the flexible printed circuit board.

[0009] In an optional embodiment, the flexible circuit board is provided with at least one electrical connection portion along its edge; an electrical connection matching portion is provided on the hard circuit board at a projection position corresponding to the electrical connection portion, and the electrical connection portion is connected to the electrical connection matching portion and is conductive to each other.

[0010] In an optional embodiment, a plurality of the electrical connection portions are spaced apart and distributed on two opposite edges of the flexible circuit board along the length direction.

[0011] In an optional embodiment, the electrical connection portion is arranged in a notch.

[0012] In an optional embodiment, along the projection direction, the edge of the flexible circuit board is flush with the edge of the rigid circuit board.

[0013] In an optional embodiment, the battery protection board further includes: an adhesive portion, which is provided on at least one of the two facing surfaces of the hard circuit board and the flexible circuit board, and is suitable for pre-bonding and connecting the hard circuit board and the flexible circuit board.

[0014] In an optional embodiment, a bending portion is connected to at least one side in the length direction of the flexible circuit board, the bending portion is bent toward the hard circuit board, one end in the length direction of the hard circuit board is located between the bending portion and the flexible circuit board, and the bending portion is suitable for connecting to an external structure.

[0015] In a second aspect, the present invention further provides a battery, comprising: a battery cell and the above-mentioned battery protection board, wherein the battery protection board is electrically connected to the battery cell.

[0016] In a third aspect, the present invention further provides a mobile terminal comprising the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of a battery protection plate according to an embodiment of the present utility model;

[0019] Figure 2 for Figure 1 The transparent structure explosion diagram of the battery protection board shown;

[0020] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the battery protection plate when only the bonding part is provided without welding components;

[0021] Description of reference numerals:

[0022] 1. Component assembly; 2. Flexible circuit board; 21. First surface; 22. Electrical connection portion; 3. Hard circuit board; 31. Electrical connection mating portion; 4. Bending portion; 5. Connector. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of the present invention.

[0024] like Figure 1-Figure 3 As shown, in the first aspect, the utility model provides a battery protection board, including: a component assembly 1, a flexible circuit board 2 and a hard circuit board 3.

[0025] The component assembly 1 includes several electronic components that constitute part of the main current path.

[0026] The flexible circuit board 2, namely FPC, is in the form of a flat sheet, and its edge shape can be adjusted as needed. In this embodiment, it can be set in the form of a rectangular sheet, and its two opposite rectangular surfaces are specifically the first surface 21 and the second surface. The component assembly 1 is correspondingly arranged on the first surface 21. Specifically, the component assembly 1 and the circuit together constitute part of the main current path, namely the first current path.

[0027] The rigid circuit board 3 is specifically a rigid PCB board, which is overlapped with the flexible circuit board 2 and is arranged on one side of the second surface of the flexible circuit board 2. A second current-passing circuit is provided on the rigid circuit board 3, and at least a portion of the flexible circuit board 2 provided with the first current-passing circuit is projected onto the rigid circuit board 3. The first current-passing circuit and the second current-passing circuit are electrically connected and together form a main current-passing circuit.

[0028] From a structural perspective, a first current-passing circuit is set on the flexible circuit board 2 and is connected to the second current-passing circuit on the rigid circuit board 3. The rigid circuit board 3 and the flexible circuit board 2 are overlapped with each other, which is equivalent to increasing the number of circuit layers of the main current-passing circuit, and can support a larger current. At the same time, since the part of the flexible circuit board 2 on which the first current-passing circuit is provided is projected onto the rigid circuit board 3, the rigid circuit board 3 can support the flexible circuit board 2 through its own rigid material, meeting the structural needs of stably setting the circuit and component assembly 1 constituting the first current-passing circuit thereon, and avoiding the separation of components and circuit boards.

[0029] The rigid circuit board 3 can be a single-sided board, a double-sided board or a multi-layer board as required. When the rigid circuit board 3 is a double-sided board or a multi-layer board, the circuit layers arranged therein are arranged in parallel.

[0030] In this embodiment, the rigid circuit board 3 is a multi-layer board having several metal layers therein for setting up circuits, and the layers are electrically connected. The metal layers are preferably copper foil. The stacking direction of the layers inside the rigid circuit board 3 is the same as the stacking direction of the layers and the flexible circuit board 2. Each metal layer is connected in parallel with part of the main conductive lines on the flexible circuit board 2.

[0031] In addition, at least part of the control circuit is provided on the flexible circuit board 2, specifically on the first side 21 of the flexible circuit board 2. The control circuit includes a number of protective devices electrically connected to each other, which are used to monitor the working status of the battery cells to be controlled and perform protective actions when an abnormality occurs, such as realizing overcurrent protection, overvoltage protection, charging protection, output short-circuit protection, etc. of the battery cells to ensure safety.

[0032] Preferably, the control circuit is entirely provided on the flexible circuit board 2. This arrangement allows only the second through-current circuit to be provided on the rigid circuit board 3, eliminating the need to install the control circuit and the need to set up complex control wiring. A relatively thick metal layer can be provided for current flow, further increasing the flow rate of the main through-current circuit.

[0033] As an alternative implementation, the control circuit can be partially arranged on the rigid circuit board 3 .

[0034] In this embodiment, the flexible printed circuit board 2 is provided with an electrical connection portion 22 along its edge. One, two, or more electrical connection portions 22 may be provided. A mating electrical connection portion 31 is provided on the rigid printed circuit board 3 at a location corresponding to the projection of the electrical connection portion 22. The electrical connection portion 22 and the mating electrical connection portion 31 are connected and electrically connected to each other. Preferably, the electrical connection between the two is achieved by soldering, using a medium such as solder paste. Specifically, the first flow path is electrically connected to the electrical connection portion, and the second flow path is electrically connected to the mating electrical connection portion 31.

[0035] An electrical connection portion 22 is provided at the edge of the flexible circuit board 2, which can avoid positions with structures such as the component assembly 1 on the first surface 21 of the flexible circuit board 2, thereby facilitating welding operations. In addition, with the rigid circuit board 3 and the flexible circuit board 2 being overlapped with each other, a one-time welding operation such as reflow soldering can be performed to achieve simultaneous welding operations of the flexible circuit board 2, the component assembly 1, the electrical connection portion 22, and the electrical connection matching portion 31, without the need for step-by-step operations, thereby avoiding mutual influences between different welding processes. In addition, compared with manual spot welding operations, the welding quality is higher, effectively avoiding the occurrence of problems such as cold solder joints.

[0036] There are multiple electrical connection parts 22, which are spaced apart on two opposite edges of the flexible circuit board 2 along the length direction. Preferably, the spaced apart distribution parts are of equal length, which effectively improves the stability of the connection between the two boards.

[0037] Further preferably, the electrical connection portion 22 is arranged in the form of a slot, and the slot is arranged in the shape of a through slot along the stacking direction of the two boards. It can be arranged in the shape of a circular slot, a square slot or a dovetail slot, and the slot opening direction is away from the flexible circuit board 2. In this embodiment, the corresponding electrical connection mating portion 31 on the rigid circuit board 3 is provided with a protrusion facing the direction of the slot, which is correspondingly arranged in the form of a solder pad and can extend into the slot to form a limit, which is convenient for the positioning and installation of the two and provides a basis for welding the corresponding solder paste and other media.

[0038] As a convertible embodiment, the electrical connection portion 22 may also be provided in a hole shape or the like.

[0039] In this embodiment, the edges of the flexible circuit board 2 and the rigid circuit board 3 are aligned along the projection direction, and the flexible circuit board 2 is completely projected onto the rigid circuit board 3. As an alternative embodiment, the edges of the two boards can also be arranged non-aligned, with only the portion of the flexible circuit board 2 provided with the first current-passing path projected onto the rigid circuit board 3.

[0040] In addition, the battery protection board also includes an adhesive portion, which is provided on at least one of the two facing surfaces of the rigid circuit board 3 and the flexible circuit board 2. In this embodiment, both surfaces are provided. The adhesive portion is specifically a structural adhesive, such as PP adhesive, which can bond and connect the rigid circuit board 3 and the flexible circuit board 2. The provision of structural adhesive can coordinate the connection between the electrical connection portion 22 and the electrical connection mating portion 31, thereby enhancing the stability of the connection between the flexible circuit board 2 and the rigid circuit board 3. At the same time, during the battery protection board molding process, the step of bonding the rigid circuit board 3 and the flexible circuit board 2 by the adhesive portion can be provided before the step of welding the electrical connection portion 22 and the electrical connection mating portion 31. This bonding step can achieve pre-positioning of the two boards.

[0041] The battery protection board also includes a bend 4, which is provided on the flexible circuit board 2. Preferably, the bend 4 is provided at one longitudinal edge of the flexible circuit board 2 and bends toward the rigid circuit board 3. One longitudinal end of the rigid circuit board 3 is located between the bend 4 and the flexible circuit board 2, suitable for connecting to an external structure, such as a battery or a host device. The provision of the bend 4 enables an auxiliary limit-connected connection between the battery protection board and the external structure.

[0042] As a changeable embodiment, the bending portions 4 may also be provided at both ends of the flexible circuit board 2 along the length direction.

[0043] In addition, the battery protection board also includes a connector 5, which can be a male or female socket, arranged on the flexible circuit board 2, away from the bending portion 4, and can be electrically connected to the battery cell.

[0044] In a second aspect, the present invention further provides a battery comprising a battery cell and the aforementioned battery protection board, wherein the battery protection board is electrically connected to the battery cell. It should be noted that the implementation of the aforementioned battery protection board embodiment is also applicable to the embodiment of this battery and can achieve the same technical effects, and will not be further elaborated here.

[0045] On the third aspect, the utility model also provides a mobile terminal, which can be any mobile terminal with a rechargeable battery, such as a mobile phone, a tablet computer, and a wearable smart device, including the above-mentioned battery. It should be noted that the implementation method of the battery protection board embodiment in the above-mentioned battery is also applicable to the embodiment of the mobile terminal and can achieve the same technical effect, which will not be repeated here.

[0046] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery protection board, characterized in that: include: Components (1); A flexible circuit board (2) comprises a first surface (21) and a second surface opposite to each other, wherein a component assembly (1) is provided on the first surface (21) and a first flow path is formed correspondingly thereto; A rigid circuit board (3) is superimposed on the flexible circuit board (2) and is correspondingly arranged on the second surface of the flexible circuit board (2), on which a second flow path is arranged. The flexible circuit board (2) is provided with at least a portion of a first flow path, which is projected onto the rigid circuit board (3). The first flow path and the second flow path are electrically connected and are jointly formed into a main flow path.

2. The battery protection board according to claim 1, characterized in that: At least part of the control circuit is provided on the flexible circuit board (2).

3. The battery protection board according to claim 1, characterized in that: The flexible circuit board (2) is provided with at least one electrical connection portion (22) along its edge; An electrical connection matching portion (31) is provided on the rigid circuit board (3) at a projection position corresponding to the electrical connection portion (22); the electrical connection portion (22) and the electrical connection matching portion (31) are connected and electrically connected to each other.

4. The battery protection board according to claim 3, characterized in that: A plurality of electrical connection portions (22) are distributed at intervals on two opposite edges of the flexible circuit board (2) along the length direction.

5. The battery protection board according to claim 3, characterized in that: The electrical connection portion (22) is arranged in a notch.

6. The battery protection board according to any one of claims 3 to 5, characterized in that: Along the projection direction, the edge of the flexible circuit board (2) is arranged flush with the edge of the rigid circuit board (3).

7. The battery protection board according to claim 1, characterized in that: Also includes: The bonding portion is provided on at least one of the two facing surfaces of the rigid circuit board (3) and the flexible circuit board (2), and is suitable for bonding and connecting the rigid circuit board (3) and the flexible circuit board (2).

8. The battery protection board according to any one of claims 1 to 5, characterized in that: A bending portion (4) is connected to at least one side of the flexible circuit board (2) in the longitudinal direction, the bending portion (4) is bent toward the rigid circuit board (3), one end of the rigid circuit board (3) in the longitudinal direction is located between the bending portion (4) and the flexible circuit board (2), and the bending portion (4) is suitable for connecting to an external structure.

9. A battery, characterized in that: include: A battery cell and a battery protection plate according to any one of claims 1 to 8, wherein the battery protection plate is electrically connected to the battery cell.

10. A mobile terminal, characterized in that: A battery comprising the battery of claim 9.

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