Battery protection board and lithium battery

Abstract

The utility model relates to the technical field of batteries, and discloses a battery protection plate and a lithium battery. The battery protection plate comprises a through-flow plate which is provided with a power device and a first circuit corresponding to the power device; the control panel and the through-flow plate are oppositely arranged in a spaced mode, and a control device and a second circuit corresponding to the control device are arranged on the control panel; and the connector comprises a female seat and a male head, one of the female seat and the male head is fixedly connected to one side of the through-flow plate and is electrically connected with the first circuit, the other one of the female seat and the male head is fixedly connected to one side of the control panel and is electrically connected with the second circuit, and the female seat is inserted into the male head so as to connect the through-flow plate and the control panel. According to the battery protection board, the through-flow board and the control board are arranged respectively, the current module and the control module in the battery protection board are separately arranged on two different boards, modularization is achieved, the through-flow board and the control board are connected together through the connector, the structure is simple, and the production efficiency is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of lithium battery, specifically relates to battery protection board and lithium battery. BACKGROUND

[0002] Lithium battery is widely used in mobile phones and other electric equipment as power storage device, and the battery protection board is usually arranged in the lithium battery. The battery protection board as an adapter between the lithium battery cell and the load can protect the lithium battery.

[0003] The battery protection board comprises a through-flow module for carrying current and a control module for controlling circuit, wherein the through-flow module has a plurality of power devices and corresponding lines, and the control module has a plurality of control devices and corresponding lines. The existing battery protection board is usually a PCB (Printed Circuit Board), and the through-flow module and the control module are arranged on the same PCB, which leads to the structure of the PCB being too complex and affecting the production efficiency. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a battery protection board and lithium battery to solve the problem of complex structure and low production efficiency of the battery protection board.

[0005] In the first aspect, the utility model provides a battery protection board, which comprises: a through-flow board, wherein the through-flow board is provided with power devices and first lines corresponding to the power devices; a control board, wherein the control board is arranged opposite to the through-flow board, and the control board is provided with control devices and second lines corresponding to the control devices; and a connector, which comprises a female seat and a male head, one of the female seat and the male head is fixedly connected to one side of the through-flow board and electrically connected with the first lines, the other of the female seat and the male head is fixedly connected to one side of the control board and electrically connected with the second lines, and the female seat is inserted into the male head to connect the through-flow board and the control board.

[0006] Beneficial effects: By separately setting up a current-carrying board and a control board, and setting power devices and corresponding circuits on the current-carrying board to form a current module, and setting control devices and corresponding circuits on the control board to form a control module, the current-carrying board is used to carry current, and the control board is used to control the circuit. This achieves modularity by separating the current module and control module in the battery protection board onto two different boards. Furthermore, by setting one of the female and male connectors to be fixedly connected to the current-carrying board and the other to the control board, when the female and male connectors are plugged in, the current-carrying board and the control board are connected through the connector. Connecting them together allows for both fixed connection and electrical connection between the current-passing board and the control board, facilitating signal transmission between them. The structure is simple, production efficiency is high, and the use of connectors reduces the number of wires between the current-passing board and the control board, reduces the impact of the current-passing board's vias on the internal resistance of the copper foil, and improves overall performance. Furthermore, the connectors, positioned between the current-passing board and the control board, create a gap between them, allowing power devices and control devices to be placed within this gap, thus protecting the devices, extending their lifespan, and reducing operating costs.

[0007] In one alternative embodiment, the number of connectors is multiple, and the multiple connectors are spaced apart between the flow plate and the control plate.

[0008] Beneficial effects: By setting multiple connectors between the flow board and the control board, the stability of the relative position between the flow board and the control board is improved, thereby further protecting the electronic components located between the flow board and the control board.

[0009] In one alternative implementation, the power device is connected to the side of the current-passing plate near the control board.

[0010] Beneficial effects: By setting the power device to be connected to the side of the current-passing plate near the control board, the power device is located in the gap between the current-passing plate and the control board, realizing the embedded packaging of the power device. This can improve space utilization and protect the power device from external damage, thereby improving the safety and reliability of the battery protection board.

[0011] In one alternative implementation, the controller is connected to the side of the control board opposite to the flow plate, or the controller is connected to the side of the control board closer to the flow plate.

[0012] Beneficial effects: By setting the control device on the control panel close to the through-flow plate, interference between the control device and the power device is avoided, thereby improving safety. By setting the control device on the control panel towards the through-flow plate, the control device is located in the gap between the through-flow plate and the control panel, which can improve space utilization and protect the control device, thereby improving the safety and reliability of the battery protection plate.

[0013] In an alternative embodiment, the through-flow plate and the control panel are both printed circuit boards.

[0014] Beneficial effects: The printed circuit board technology is mature, has the advantages of high reliability, easy maintenance, easy design, easy assembly, etc., and can provide stable support for electronic components.

[0015] In an alternative embodiment, the battery protection plate further comprises: a flexible circuit board, the flexible circuit board is arranged on the side of the through-flow plate away from the control panel and is electrically connected with the first circuit in the through-flow plate; the flexible circuit board is connected with an adapter, and the adapter is adapted to be electrically connected with an external load.

[0016] Beneficial effects: By connecting the flexible circuit board on the side of the through-flow plate away from the control panel, the soft board and the hard board are matched, which can provide stable support for the power device, and the flexible circuit board can be bent to adapt to different models of battery cells, which is good in versatility, convenient to use, and the battery protection plate has a three-layer structure of flexible circuit board, through-flow plate and control panel, the number of circuit boards is increased, the charging and discharging power of the battery protection plate is further increased, and the charging and discharging performance of the battery protection plate is improved.

[0017] In an alternative embodiment, the flexible circuit board and the through-flow plate are packaged as a whole.

[0018] Beneficial effects: By packaging the flexible circuit board and the through-flow plate as a whole, stable connection of the flexible circuit board and the through-flow plate is realized, the soft board and the hard board are matched, which is suitable for different battery cells, the packaging process has high reliability and high production efficiency, the flexible circuit board and the through-flow plate are protected, and safety is improved.

[0019] In an alternative embodiment, the battery protection plate further comprises: a connecting piece, the connecting piece is connected to the side of the flexible circuit board away from the through-flow plate and is electrically connected with the circuit in the flexible circuit board, and the connecting piece is adapted to be electrically connected with the battery cell.

[0020] Beneficial effects: By setting the connecting piece on the side of the flexible circuit board away from the through-flow plate, one side of the connecting piece is connected to the flexible circuit board and the other side is adapted to be connected to the battery cell, the connection between the battery protection plate and the battery cell is realized through the connecting piece, which is convenient to operate and has high reliability.

[0021] Secondly, this utility model also provides a lithium battery, comprising: a battery cell; and the aforementioned battery protection board, wherein the battery protection board is disposed at one end of the battery cell and is electrically connected to the battery cell via a connecting piece. Since the lithium battery includes a battery protection board and has the same effect as a battery protection board, it will not be described in detail here.

[0022] In one alternative embodiment, the lithium battery further includes a protective cover that covers the outside of the battery protection plate.

[0023] Beneficial effects: By setting a protective cover on the outside of the battery protection board, the battery protection board is protected, external damage to the battery protection board is reduced, safety is improved, and service life is extended. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is an exploded view of a battery protection board according to an embodiment of the present utility model;

[0026] Figure 2 for Figure 1 The diagram shows the assembled structure of the battery protection board.

[0027] Figure 3 for Figure 2 A top view of the battery protection board shown;

[0028] Figure 4 This is a schematic diagram of the structure of a lithium battery according to an embodiment of the present utility model;

[0029] Figure 5 for Figure 4 The diagram shows the internal structure of the lithium battery behind the protective cover.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Flow board; 2. Control board; 3. Connector; 301. Female connector; 302. Male connector; 4. Power device; 5. Control device; 6. Flexible circuit board; 601. Adapter; 7. Connecting piece; 8. Battery cell; 9. Protective cover; 10. Battery protection board. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] The following is combined with Figures 1 to 5 The following describes embodiments of the present invention.

[0034] According to an embodiment of the present invention, in one aspect, a battery protection board is provided, such as... Figures 1 to 3 As shown, the battery protection board includes: a current-passing plate 1, a control board 2, and a connector 3. The current-passing plate 1 is equipped with a power device 4 and a first circuit corresponding to the power device 4; the control board 2 is spaced apart from the current-passing plate 1, and is equipped with a control device 5 and a second circuit corresponding to the control device 5; the connector 3 includes a female connector 301 and a male connector 302. One of the female connector 301 and the male connector 302 is fixedly connected to one side of the current-passing plate 1 and electrically connected to the first circuit, while the other of the female connector 301 and the male connector 302 is fixedly connected to one side of the control board 2 and electrically connected to the second circuit. The female connector 301 is inserted into the male connector 302 to connect the current-passing plate 1 and the control board 2.

[0035] The battery protection board of this embodiment uses a current-carrying board 1 and a control board 2. A power device 4 and corresponding wiring are installed on the current-carrying board 1 to form a current module, and a control device 5 and corresponding wiring are installed on the control board 2 to form a control module. This allows the current-carrying board 1 to carry current and the control board 2 to control the circuit. In other words, the current module and control module in the battery protection board are separated and placed on two different boards, achieving modularity. Furthermore, one of the female connector 301 and male connector 302 is fixedly connected to the current-carrying board 1, and the other is fixedly connected to the control board 2. When the female connector 301 and male connector 302 are plugged in, the current-carrying board 1 and the control board 2... Board 2 is connected together via connector 3, which can realize both the fixed connection between current-passing board 1 and control board 2 and the electrical connection between current-passing board 1 and control board 2, and realize signal transmission between control board 2 and current-passing board 1. The structure is simple and the production efficiency is high. The use of connector 3 can also reduce the number of wires between current-passing board 1 and control board 2, reduce the impact of the through holes of current-passing board 1 on the internal resistance of current-passing copper foil, and improve the overall performance. In addition, connector 3 is supported between current-passing board 1 and control board 2, so that there is a gap between current-passing board 1 and control board 2, which can facilitate the placement of power device 4 and control device 5 in the gap, which is beneficial to protect the device, extend its service life, and reduce the cost of use.

[0036] It should be noted that if the connector 3 is not used, and a traditional connecting line is used to connect the through-flow plate 1 and the control plate 2, corresponding through holes need to be opened on the through-flow plate 1 and the control plate 2 to facilitate the connecting line to pass through. However, the through-flow plate 1 is a current-carrying module, and the through holes will have a great impact on the internal resistance of the copper sheet on the through-flow plate 1, thereby affecting the charging and discharging performance of the battery.

[0037] Optionally, the female seat 301 of the connector 3 is fixedly connected to one side of the through-flow plate 1 along the thickness direction of the through-flow plate 1, and the male head 302 is fixedly connected to one side of the control plate 2 along the thickness direction of the control plate 2. When the male head 302 is inserted into the female seat 301 to form the connector 3, the through-flow plate 1 and the control plate 2 are oppositely arranged and spaced apart, and the connector 3 is located in the space between the through-flow plate 1 and the control plate 2. The connector 3 not only serves to electrically connect the through-flow plate 1 and the control plate 2, but also serves to support between the through-flow plate 1 and the control plate 2. Specifically, the female seat 301 is welded with the first circuit on the through-flow plate 1 to achieve the fixed connection of the female seat 301 and the through-flow plate 1; and the male head 302 is welded with the second circuit on the control plate 2 to achieve the fixed connection of the male head 302 and the control plate 2. It can be understood that as an alternative embodiment, the male head 302 can be fixedly connected to the through-flow plate 1, and the female seat 301 can be fixedly connected to the control plate 2.

[0038] It should be noted that the through-flow plate 1 is a current-carrying module for placing power devices 4 and carrying current, and the power devices 4 include Metal-Oxide-Semiconductor Field-Effect Transistor (MOS tube), precision resistor, etc. The power devices 4 are fixedly connected to the through-flow plate 1 and electrically connected to the first circuit on the through-flow plate 1. The control plate 2 is a control module for placing control devices 5 and transmitting control signals, and the control devices 5 include integrated circuit (IC), etc. The control devices 5 are fixedly connected to the control plate 2 and electrically connected to the first circuit. Multiple control devices 5 can be arranged on the control plate 2, and the control plate 2 can control multiple control devices 5 and also control the through-flow plate 1.

[0039] Optionally, the number of the through-flow plate 1 and the control plate 2 is one, which is simple in structure, convenient to process, and low in cost. It can be understood that as an alternative embodiment, the number of the through-flow plate 1 and the control plate 2 can also be multiple, and the number of the through-flow plate 1 and the number of the control plate 2 can be unequal according to design and performance requirements.

[0040] In one embodiment, the number of connectors 3 is multiple, and the multiple connectors 3 are distributed between the through-flow plate 1 and the control plate 2. By arranging multiple connectors 3 between the through-flow plate 1 and the control plate 2, the stability of the relative position between the through-flow plate 1 and the control plate 2 is improved, thereby further protecting the electronic components between the through-flow plate 1 and the control plate 2. The electronic components refer to the power devices 4 on the through-flow plate 1 or the control devices 5 on the control plate 2.

[0041] It should be noted that the specific number of connectors 3 depends on the number of line joints on the through-flow plate 1 and the control plate 2. Preferably, the number of connectors 3 is two, and one connector 3 is arranged on each side along the length direction of the battery protection plate, which can ensure the stability of the relative position between the through-flow plate 1 and the control plate 2, and can also avoid occupying too much space in the interval between the through-flow plate 1 and the control plate 2 due to too many connectors 3, thereby avoiding affecting the arrangement of electronic components. The length direction refers to the direction of the arrow in the middle. Figure 3

[0042] In one embodiment, the power devices 4 are connected to the side of the through-flow plate 1 close to the control plate 2. By arranging the power devices 4 to be connected to the side of the through-flow plate 1 close to the control plate 2, the power devices 4 are located in the interval between the through-flow plate 1 and the control plate 2, which realizes the inlaid packaging of the power devices 4, improves the space utilization, and protects the power devices 4 from external damage, thereby improving the safety and reliability of the battery protection plate.

[0043] In one embodiment, the control devices 5 are connected to the side of the control plate 2 away from the through-flow plate 1. By arranging the control devices 5 on the side of the control plate 2 away from the through-flow plate 1, interference between the control devices 5 and the power devices 4 is avoided, thereby improving safety.

[0044] In addition, in other embodiments, the control devices 5 can also be arranged on the side of the control plate 2 close to the through-flow plate 1. By arranging the control devices 5 on the side of the control plate 2 close to the through-flow plate 1, the control devices 5 are located in the interval between the through-flow plate 1 and the control plate 2, which improves the space utilization and protects the control devices 5, thereby improving the safety and reliability of the battery protection plate. It should be noted that when the control devices 5 and the power devices 4 are both arranged between the through-flow plate 1 and the control plate 2, the control devices 5 and the power devices 4 should be arranged in a staggered manner to avoid interference caused by the control devices 5 and the power devices 4 arranged in a straight line, thereby ensuring safety.

[0045] ​In an embodiment, the through-flow board 1 and the control board 2 are both printed circuit boards. The printed circuit board (PCB) is a common electronic component, and the PCB serves as a support for electronic components and is a carrier for electrical interconnection of electronic components. The printed circuit board technology is mature, has the advantages of high reliability, easy maintenance, easy design, and easy assembly, and can provide stable support for electronic components.

[0046] In an embodiment, the battery protection board further comprises a flexible circuit board 6 disposed on the through-flow board 1 away from the control board 2 and electrically connected to the first circuit in the through-flow board 1; and an adapter 601 connected to the flexible circuit board 6, the adapter 601 being adapted to be electrically connected to an external load. The flexible printed circuit (FPC) has the characteristics of high wiring density, light weight, thin thickness, and good bending property, and can be flexibly bent according to actual conditions, and is suitable for different models of battery cells. By connecting the flexible circuit board 6 on the through-flow board 1 away from the control board 2, the soft board and the hard board are matched, which not only ensures that the through-flow board 1 can provide stable support for the power device 4, but also can adapt to different models of battery cells 8 through the bendable type of the flexible circuit board 6, has good versatility, is convenient to use, and the battery protection board 10 has a three-layer board stacking structure of the flexible circuit board 6, the through-flow board 1, and the control board 2. The increase in the number of circuit boards further increases the charge and discharge power of the battery protection board 10 and improves the charge and discharge performance of the battery protection board 10.

[0047] It should be noted that the adapter 601 is a metal piece, the adapter 601 is electrically connected to the circuit on the flexible circuit board 6, and the battery protection board is electrically connected to the external load through the adapter 601, wherein the external load can be a mobile phone or other electrical equipment.

[0048] In an embodiment, the flexible circuit board 6 and the through-flow board 1 are packaged as a whole. By packaging the flexible circuit board 6 and the through-flow board 1 as a whole, stable connection of the flexible circuit board 6 and the through-flow board 1 is achieved, the soft board and the hard board are matched, and different battery cells 8 are applicable. The packaging process has high reliability and high production efficiency, can protect the flexible circuit board 6 and the through-flow board 1, and improves safety.

[0049] Preferably, the flexible circuit board 6 and the through-flow board 1 are packaged by a system in a package (SIP) process, which has good stability and low cost.

[0050] In one embodiment, the battery protection board further comprises a connecting piece 7 connected to the side of the flexible circuit board 6 away from the through-flow board 1 and electrically connected with the circuit in the flexible circuit board 6, and the connecting piece 7 is adapted to be electrically connected with the battery cell 8. By arranging the connecting piece 7 on the side of the flexible circuit board 6 away from the through-flow board 1, and connecting one side of the connecting piece 7 to the flexible circuit board 6 and the other side of the connecting piece 7 being adapted to be connected with the battery cell 8, the connection between the battery protection board 10 and the battery cell 8 is realized through the connecting piece 7, which is convenient to operate and has high reliability.

[0051] The battery protection board of the embodiment is formed by stacking the flexible circuit board 6, the through-flow board 1 and the control board 2, the number of the connectors 3 is multiple, a multi-connector multi-layer board stacking structure is formed, and the charging and discharging power of the protection board is increased; the through-flow board 1 mainly serves as a current bearing layer through the inner layer network, the control module is formed by arranging the management device on the control board 2, the control board 2 is arranged separately from the through-flow board 1, the independence of the control module is realized, the battery protection board 10 is modularized, one board can be used for multiple purposes, and the production efficiency is improved; the through-flow board 1 and the control board 2 are connected through the connectors 3, the through-flow board 1 and the control board 2 are separated, the heat management and the battery module design are better realized, the production efficiency is improved, one board can be used for multiple purposes, compared with the traditional connection mode directly through the connecting wire, the number of blind holes and through holes on the through-flow board 1 and the control board 2 is reduced, the processing is facilitated, the cost is reduced, the internal resistance can be reduced, and the charging and discharging performance of the battery is improved; the power device 4 is placed between the through-flow board 1 and the control board 2, and the packaging and protection of the power device 4 are facilitated.

[0052] Optionally, the connector 3 can be a board-to-board connector, or an FPC connector, or the connection can be controlled through a lead wire.

[0053] According to the embodiment of the utility model, on the other hand, a lithium battery is also provided, including: battery cell 8 and the battery protection board 10 described above. The battery protection board 10 is arranged at one end of the battery cell 8, and the battery protection board 10 is electrically connected with the battery cell 8 through the connecting piece 7. By arranging the battery protection board 10 at one end of the battery cell 8, and electrically connecting the battery protection board 10 with the battery cell 8 through the connecting piece 7, the battery cell 8 can be protected through the battery protection board 10, and the safety of the battery cell 8 is improved.

[0054] It should be noted that the battery cell 8 has two tabs, and the number of the connecting pieces 7 is two, each connecting piece 7 is connected with a tab; the connecting piece 7 is used to realize the connection between the battery cell 8 and the battery protection board 10, and the adapter 601 on the flexible circuit board 6 is used to realize the connection between the external load and the battery protection board 10, so that the electrical connection between the battery cell and the external load is realized through the battery protection board 10, and the battery cell 8 provides energy to the external load.

[0055] Preferably, the external load is a mobile phone, the lithium battery is a mobile phone lithium battery, and the battery protection plate is used to charge and discharge energy between the mobile phone and the battery cell 8.

[0056] In one embodiment, the lithium battery further comprises a protective cover 9 covering the outside of the battery protection plate 10. By setting the protective cover 9 on the outside of the battery protection plate 10, the protection of the battery protection plate 10 is realized, the damage of the battery protection plate 10 by the outside world is reduced, the safety is improved, and the service life is prolonged.

[0057] Although the embodiments of the present application are described in conjunction with the drawings, various modifications and changes can be made by those skilled in the art without departing from the spirit and scope of the present application, and such modifications and changes fall within the scope defined by the appended claims.

Claims

1. A battery protection plate, characterized in that, include: A flow plate (1) is provided with a power device (4) and a first line corresponding to the power device (4); Control board (2), the control board (2) is arranged at an interval relative to the flow plate (1), the control board (2) is provided with a control device (5) and a second line corresponding to the control device (5); The connector (3) includes a female connector (301) and a male connector (302). One of the female connector (301) and the male connector (302) is fixedly connected to one side of the flow plate (1) and electrically connected to the first line. The other of the female connector (301) and the male connector (302) is fixedly connected to one side of the control board (2) and electrically connected to the second line. The female connector (301) is inserted into the male connector (302) to connect the flow plate (1) and the control board (2).

2. The battery protection plate of claim 1, wherein, The number of connectors (3) is multiple, and the multiple connectors (3) are distributed at intervals between the flow plate (1) and the control plate (2).

3. The battery protection plate of claim 1, wherein, The power device (4) is connected to the side of the flow plate (1) near the control plate (2).

4. The battery protection plate of claim 1, wherein, The control device (5) is connected to the side of the control board (2) away from the flow plate (1), or the control device (5) is connected to the side of the control board (2) close to the flow plate (1).

5. The battery protection plate according to any one of claims 1 to 4, characterized in that, Both the flow board (1) and the control board (2) are printed circuit boards.

6. The battery protection plate of claim 5, wherein, The battery protection board further includes: a flexible circuit board (6), which is disposed on the side of the current-passing plate (1) away from the control board (2) and electrically connected to the first line in the current-passing plate (1); The flexible circuit board (6) is connected to an adapter (601), which is adapted to be electrically connected to an external load.

7. The battery protection plate of claim 6, wherein, The flexible circuit board (6) and the flow plate (1) are encapsulated as one unit.

8. The battery protection plate of claim 6, wherein, The battery protection board further includes a connecting piece (7), which is connected to the side of the flexible circuit board (6) away from the current-passing plate (1) and electrically connected to the lines in the flexible circuit board (6). The connecting piece (7) is adapted to be electrically connected to the battery cell (8).

9. A lithium battery, characterized by include: Battery cell (8); The battery protection board (10) according to any one of claims 1 to 8 is disposed at one end of the battery cell (8) and is electrically connected to the battery cell (8) through a connecting piece (7).

10. The lithium battery of claim 9, wherein, The lithium battery also includes a protective cover (9), which covers the outside of the battery protection plate (10).

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