Battery protection board, battery module and electronic equipment

Abstract

The utility model provides a battery protection board, a battery module and electronic equipment. The battery protection board comprises at least one pair of device modules and a circuit board. The circuit board comprises a circuit main board and at least one pair of main board branches electrically connected with the circuit main board, the at least one pair of main board branches are bent towards one side far away from the battery cell relative to the circuit main board, and the device module is correspondingly and electrically connected to the main board branches and located at one ends, far away from the battery cell, of the main board branches; and the device module is electrically connected with the battery cell through the mainboard branch and the circuit mainboard. According to the battery protection board, devices are made into modules and externally arranged above the circuit mainboard, the space occupation area of the battery mainboard is reduced, the space at the top of the battery cell is further compressed, the battery protection function is achieved, meanwhile, enough space is reserved to increase the size of the battery cell, and therefore the capacity of the battery is increased.

Description

Technical Field

[0001] This application relates to the field of battery packaging technology, and in particular to a battery protection board, a battery module, and an electronic device. Background Technology

[0002] With the continuous advancement and popularization of technology, people have increasingly higher requirements for the batteries of electronic devices. Currently, electronic device batteries consist of battery cells and battery protection boards, with the main control board and battery protection board electrically connected via connectors. If the charging power is too high, dual connectors are typically used to avoid severe overheating of a single connector during high-current charging. To increase battery capacity, a common approach is to make the battery protection board at the top of the battery cell increasingly narrower, allowing for a further increase in cell volume within a fixed overall battery length, thus increasing battery capacity. However, with increasing battery charging power, the overheating of the battery protection board has become a bottleneck limiting further narrowing of the board. Furthermore, using printed circuit boards and components with lower internal resistance further increases costs, making the pursuit of increased capacity more costly. Utility Model Content

[0003] This application provides an improved battery protection board, battery module, and electronic device.

[0004] This application provides a battery protection board, including:

[0005] At least one pair of device modules; and

[0006] The circuit board includes a main circuit board and at least one pair of main circuit branches electrically connected to the main circuit board. The at least one pair of main circuit branches are bent relative to the main circuit board toward the side away from the battery cell. The device module is electrically connected to the main circuit branch and is located at the end of the main circuit branch away from the battery cell. The device module is electrically connected to the battery cell through the main circuit branch and the main circuit board.

[0007] Preferably, the at least one pair of motherboard branches bends in the same direction relative to the circuit motherboard.

[0008] Preferably, the at least one pair of motherboard branches are located on the same side of the circuit motherboard.

[0009] Preferably, the at least one pair of motherboard branches are located on both sides of the circuit motherboard.

[0010] Preferably, the at least one pair of motherboard branches are spaced apart, with a maximum distance of at least 10mm between them.

[0011] Preferably, the maximum width of the motherboard branch is less than the maximum width of the device module.

[0012] Preferably, one side of the circuit board is provided with a pair of battery cell connection terminals for electrical connection with the battery cell; the other side of the circuit board is provided with a reinforcing plate.

[0013] Preferably, the circuit board is a flexible circuit board.

[0014] Preferably, the battery protection board includes a pair of device modules and a power circuit, a protection circuit, and a power detection circuit respectively disposed in the pair of device modules; the power circuit includes a plurality of MOSFETs, wherein some of the MOSFETs are electrically connected to the protection circuit and integrated in one of the device modules, and the remaining MOSFETs are electrically connected to the power detection circuit and integrated in the other device module.

[0015] Preferably, the device module is externally mounted on the circuit motherboard.

[0016] This application also provides a battery module, including:

[0017] The battery cell includes a pair of tabs; and

[0018] As described in any of the above embodiments, the circuit board of the battery protection board is electrically connected to a pair of tabs of the battery cell.

[0019] Preferably, the battery protection board is located on top of the battery cell; wherein, in the thickness direction of the battery cell, the main circuit board of the circuit board is horizontally laid on top of the battery cell; in the thickness direction of the battery cell, the main circuit branch of the circuit board is bent upward relative to the main circuit board, so that the device module electrically connected to the main circuit branch is located above the main circuit board.

[0020] This application also provides an electronic device, including: a main control board, at least one pair of electrical connectors, and a battery module as described in any of the above embodiments, wherein the main control board is electrically connected to at least one pair of device modules of the battery protection board of the battery module through the at least one pair of electrical connectors.

[0021] Preferably, the electrical connector is externally located on the main control board and is configured correspondingly to the device module.

[0022] This application provides a battery protection board, a battery module, and an electronic device. The battery protection board includes at least one pair of device modules and a circuit board. The circuit board includes a main circuit board and at least one pair of main circuit branches electrically connected to the main circuit board. The at least one pair of main circuit branches are bent relative to the main circuit board. The device modules are correspondingly electrically connected to the ends of the main circuit branches and are electrically connected to the battery cells through the main circuit branches and the main circuit board. This arrangement makes the devices into modules, externally placed above the main circuit board, reducing the space occupied by the battery main circuit board, further compressing the space at the top of the battery cells, providing battery protection functions, and at the same time leaving enough space to increase the volume of the battery cells, thereby increasing the battery capacity.

[0023] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] Figure 1 The diagram shown is a schematic block diagram of one embodiment of the electronic device of this application.

[0026] Figure 2 As shown Figure 1 A cross-sectional view of the electronic device shown at line AA.

[0027] Figure 3 As shown Figure 1 A cross-sectional view of the electronic device shown at the BB line.

[0028] Figure 4 As shown Figure 1 The diagram shows the internal circuitry of the battery protection board.

[0029] Figure 5 As shown Figure 1 A front view of one embodiment of the circuit board of the battery protection board is shown.

[0030] Figure 6 As shown Figure 5 The diagram shows the structure of the back of the circuit board of the battery protection board.

[0031] Figure 7 As shown Figure 5 The diagram shows the charging current of the circuit board of the battery protection board.

[0032] Figure 8 As shown Figure 5 A front view structural diagram of another embodiment of the circuit board of the battery protection board shown. Detailed Implementation

[0033] The battery protection board, battery module, and electronic device provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings. Unless otherwise specified, the features of the various embodiments and implementation methods described below can be combined arbitrarily with each other.

[0034] Figure 1 The diagram shown is a schematic block diagram of an embodiment of the electronic device 1 of this application. Figure 2 As shown Figure 1 A cross-sectional view of the electronic device 1 shown at line AA. Figure 3 As shown Figure 1 A cross-sectional view of the electronic device 1 at line BB shown. (Combined with...) Figures 1 to 3 As shown, the electronic device 1 includes a main control board 11, at least one pair of electrical connectors 12, and a battery module 13. The main control board 11 is electrically connected to the battery module 13 via at least one pair of electrical connectors 12. Figure 1 In the illustrated embodiment, the battery module 13 includes a battery cell 14 and a battery protection board 2. The main control board 11 and the battery protection board 2 are electrically connected via a connector 12. In this embodiment, the electronic device 1 is a mobile phone with high-power charging. To prevent excessive heat generation of a single connector 12 during high-current charging, a pair of electrical connectors 12 are provided and electrically connected to the battery protection board 2. In this embodiment, the battery protection board 2 is located on top of the battery cell 14. The battery cell 14 includes a pair of tabs 141. The battery protection board 2 is electrically connected to the battery cell 14 via the pair of tabs 141.

[0035] exist Figure 1 and Figure 2 In the illustrated embodiment, the battery protection board 2 includes at least one pair of device modules 21 and a circuit board 22. The device modules 21 are assembled onto the circuit board 22. The circuit board 22 is electrically connected to a pair of tabs 141 of the battery cell 14. The main control board 11 is electrically connected to at least one pair of device modules 21 of the battery module 13 via at least one pair of electrical connectors 12. In this embodiment, the circuit board 22 includes a main circuit board 221 and at least one pair of main circuit board branches 222 electrically connected to the main circuit board 221. The at least one pair of main circuit board branches 222 are bent relative to the main circuit board 221 towards the side away from the battery cell 14. The at least one pair of main circuit board branches 222 and the main circuit board 221 can be understood as not being on the same plane, and the bending direction of the main circuit board branches 222 is away from the battery cell 14. The device modules 21 are correspondingly electrically connected to the main circuit board branches 222 and located at the end of the main circuit board branches 222 away from the battery cell 14. The device modules 21 are electrically connected to the battery cell 14 via the main circuit board branches 222 and the main circuit board 221. One end of the main board branch 222 away from the battery cell 14 is used to connect the device module 21, and the other end is electrically connected to the main board 221. This makes the main board 221 and the main board branch 222 form a current path to realize the electrical connection between the main control board 11 and the battery cell 14.

[0036] In this embodiment, the battery protection board 2 is made into a module and placed on top of the circuit main board 221. This effectively utilizes the space above the battery main board 221, reduces the space occupied by the battery main board 221, further compresses the space at the top of the battery cell 14, provides battery protection function, and leaves enough space for the battery cell 14 to further increase the volume of the battery cell 14, thereby increasing the battery capacity.

[0037] exist Figure 1 In the illustrated embodiment, the circuit board 221 of the circuit board 22 is horizontally laid on top of the battery cell 14 in the thickness direction. In the thickness direction of the battery cell 14, the main board branch 222 of the circuit board 22 is bent upwards relative to the main board 221, so that the device module 21 electrically connected to the main board branch 222 is located above the main board 221. This arrangement reduces the overall height of the battery module to the thickness of the main board 221 plus the thickness of the battery cell 14, thus reducing the height dimension. This arrangement also fully frees up the top space of the battery cell 14, increasing its volume and improving battery capacity. Changing the battery protection board 2 from its original arrangement direction in the battery cell 14 to a 90° rotation, i.e., placing the battery protection board 2 flat on top of the battery cell 14, reduces the space above the battery cell 14 from the width of the main board 221 to its thickness, thereby freeing up top space for the battery cell 14. This facilitates increasing the volume of the battery cell 14 and improving its capacity. Furthermore, the battery protection circuit components are modularized, and the component module 21 is externally mounted on the circuit motherboard 221. For example, by externally mounting the component module 21 on top of the circuit motherboard 221, it shares space with the dual electrical connector 12, reducing the space occupied on the motherboard, further compressing the top space of the battery cell 14, providing battery protection functionality, and leaving sufficient space for the battery cell 14, allowing the volume of the battery cell 14 to increase, thereby improving battery capacity. In addition, the battery protection board 2 of this embodiment retains the structure of the dual electrical connector 12 to ensure high-power charging.

[0038] exist Figures 1 to 3 In the illustrated embodiment, circuit board 22 is a flexible circuit board. Both the main circuit board 221 and the main circuit branch 222 are flexible printed circuit boards (FPCs). Flexible circuit boards are used for wiring and have flexible characteristics. Flexible circuit boards can be bent within a limited space, thus enabling the main circuit branch 222 to bend relative to the main circuit board 221. Furthermore, flexible circuit boards are lightweight, reducing the overall weight of the electronic device, have good shock resistance, are resistant to high temperatures and humidity, and offer good reliability and stability. In this embodiment, a single-layer FPC is used at the bend of the main circuit branch 222 relative to the main circuit board 221. This single-layer FPC is thinner after bending than a double-layer FPC, saving more folding space and facilitating packaging.

[0039] exist Figure 1 and Figure 3 In the illustrated embodiment, a pair of cell connection terminals are provided on one side of the circuit board 221. Nickel tabs 223 are provided at these cell connection terminals for electrical connection with the cell 14. The circuit board 221 is soldered to a pair of tabs 141 via the nickel tabs 223. The connection via the nickel tabs 223 facilitates soldering and enables a more efficient and reliable connection. Furthermore, nickel has excellent conductivity, effectively reducing the internal resistance of the battery and ensuring smooth current flow. Figure 1 and Figure 3 In the illustrated embodiment, a reinforcing plate 224 is provided on the other side of the circuit board 221. The reinforcing plate 224 can be a reinforcing steel plate. Since the circuit board 221 is a flexible circuit board, the reinforcing plate 224 can enhance the strength of the circuit board 221 and prevent deformation.

[0040] Figure 4 As shown Figure 1 The diagram shows the internal circuitry of battery protection board 2. (Combined with...) Figure 1 and Figure 4 As shown, the battery protection board 2 includes a pair of device modules 21 and a power circuit 23, a protection circuit 24, and a power detection circuit 25, each disposed within the pair of device modules 21. The power circuit 23 includes multiple MOSFETs. Some of these MOSFETs are electrically connected to the protection circuit 24 and integrated into one of the device modules 21, while the remaining MOSFETs are electrically connected to the power detection circuit 25 and integrated into the other device module 21. Figure 4 In the illustrated embodiment, multiple MOSFETs can be represented by Q1, Q2, Q3, and Q4. Some of the MOSFETs Q1 and Q2 are electrically connected to the protection circuit 24 and integrated into one of the device modules 21. This device module 21 is electrically connected to the two terminals B+ and B- of the battery cell, which can be a pair of tabs 141 of the battery cell 14. The remaining MOSFETs Q3 and Q4 are electrically connected to the power detection circuit 25 and integrated into another device module 21. This device module 21 is electrically connected to the two output terminals P+ and P- of the battery protection circuit, which are respectively electrically connected to a pair of electrical connectors 12, achieving electrical connection with the main control board 11. This configuration improves the integration of the battery protection board 2 and facilitates packaging.

[0041] In this embodiment, the pair of device modules 21 have identical structures and dimensions. In some embodiments, the maximum width of the device module 21 ranges from 5 to 6 mm, and the maximum height ranges from 5 to 5.3 mm. In some embodiments, the maximum width of the device module 21 can be 5 mm, 5.2 mm, 5.4 mm, 5.6 mm, 5.8 mm, or 6 mm. In some embodiments, the maximum height of the device module 21 can be 5 mm, 5.1 mm, 5.2 mm, or 5.3 mm. Making the device module 21 as small as possible is beneficial for reducing the volume of the battery protection board 2, leaving more space for the battery cell 14, and thus increasing the volume and capacity of the battery cell 14.

[0042] exist Figure 4 In the illustrated embodiment, the connection terminals P1+, P2+, SDA, SCL, P1-, and P2- in the battery protection circuit are electrically connected to the electrical connector 12 via circuit board 22. The power circuit 23 includes a resistor Rs1 and MOSFETs Q1, Q2, Q3, and Q4. To reduce heat generation on the battery protection board 2, a high-power battery protection board 2 uses a precision resistor and a set of MOSFETs in parallel to reduce the on-resistance. Furthermore, a pair of electrical connectors 12 are used to effectively reduce heat generation on the connectors 12 and the main board branch 222. The protection circuit 24 controls the on / off state of MOSFETs Q1, Q2, Q3, and Q4 to achieve overcharge / over-discharge protection and overcurrent protection during charging and discharging. The power detection circuit 25 includes a fuel gauge and its peripheral resistors and capacitors. It not only calculates the power level by detecting the voltage of the precision resistor and the cell voltage but also provides primary protection. Compared with related technologies, this simplifies the circuit components of the battery protection circuit, resulting in simpler wiring and reduced costs.

[0043] Combination Figures 1 to 4 In the embodiment shown, the battery protection board 2 will Figure 4 The components of the battery protection circuit shown are integrated into two component modules 21 above the electrical connector 12, exhibiting high integration. For example... Figure 2 As shown, the upper layer is the device module 21, the middle layer is the mainboard branch 222 (FPC), and the lower layer is the electrical connector 12. Only the circuit mainboard 221 with steel reinforcement is retained at the top of the battery cell 14, as shown. Figure 3 As shown, the upper layer is a reinforcing plate (steel plate), the middle layer is the circuit board 221 (FPC), and the lower layer is a nickel sheet 223. Compared with related technologies, the thickness and weight of the battery protection board 2 can be significantly reduced by integrating the modules.

[0044] Figure 5 As shown Figure 1 A front view of one embodiment of the circuit board 22 of the battery protection board 2 shown. Figure 6 As shown Figure 5A schematic diagram of the back of the circuit board 22 of the battery protection board 2 shown. Figure 7 As shown Figure 5 The diagram shows the charging current of circuit board 22 of battery protection board 2. Figure 1 , Figures 5 to 6 In the illustrated embodiment, at least one pair of mainboard branches 222 are bent in the same direction relative to the mainboard 221. This arrangement simplifies the entire charging circuit and reduces manufacturing complexity. Figure 1 , Figures 5 to 6 In the illustrated embodiment, at least one pair of mainboard branches 222 are located on the same side of the mainboard circuit 221. This arrangement creates a battery protection board 2 with single electrodes distributed on the same side. This structure moves the two electrical connectors 12 to the same side while maintaining a certain bending gap. Simultaneously, the FPC connecting the mainboard branches 222 of each electrical connector 12 is changed from a two-layer to a single-layer structure, thus reducing the overall thickness of the FPC after bending. A schematic diagram of its charging current is shown below. Figure 7 As shown, this significantly reduces the circulating current in the charging path. Furthermore, distributing the two mainboard branches 222 on one side of the mainboard 221 also greatly reduces the electromagnetic interference of this circulating current. Figure 5 and Figure 6 As shown, the mainboard branch 222 is a single-layer FPC relative to the mainboard 221. A portion of the mainboard 221 is a double-layer FPC. After bending, the thickness of the single-layer FPC will be thinner than that of the double-layer FPC, increasing the blank space in the bending area and improving space utilization. In related technologies, all protection devices are placed on the main control board 11. Compared with related technologies, this embodiment reduces the number of devices on the main control board 11, thereby reducing the space required for device placement while retaining the battery protection function.

[0045] exist Figure 1 , Figures 5 to 7 In the illustrated embodiment, at least one pair of motherboard branches 222 are spaced apart. This arrangement reduces signal interference between the two motherboard branches 222 and facilitates the assembly of the two device modules 21. Figures 5 to 7 In the illustrated embodiment, the maximum distance L between at least one pair of motherboard branches 222 is at least 10 mm. In some embodiments, the maximum distance L between at least one pair of motherboard branches 222 can be 10 mm or more. This arrangement avoids interference when assembling two device modules 21, and the spacing is a safe distance to prevent signal interference and improve safety. Figures 5 to 7 In the illustrated embodiment, the maximum width of the motherboard branch 222 is less than the maximum width of the device module 21. This arrangement facilitates the installation of the device module 21 and reduces installation difficulty.

[0046] Figure 8 As shown Figure 5A front view of another embodiment of the circuit board 22 of the battery protection board 2 shown. Figure 8 The illustrated embodiments and Figure 7 The illustrated embodiment is similar, with the main difference being that at least one pair of mainboard branches 222 are located on opposite sides of the mainboard 221. The current path of the mainboard 221 adopts a large loop. Positioning the pair of mainboard branches 222 on opposite sides of the mainboard 221 serves two purposes: reducing signal interference and facilitating assembly.

[0047] In the aforementioned battery protection board 2 solution, multiple components of the battery protection circuit are integrated into a component module, and the electrical connector 12 is externally placed on the main control board and correspondingly positioned with the component module 21. For example, the electrical connector 12 is electrically connected to the component module 21 and externally placed above the battery cell 14, enabling the component module 21 and the electrical connector 12 to share space, reducing the space occupied by the main circuit board 221. Furthermore, the battery protection board 2 of this embodiment can retain the design of dual electrical connectors to ensure high-power charging, further compress the top space of the battery cell 14, and provide battery protection function. At the same time, sufficient space is left for the battery cell 14, which can increase the volume of the battery cell 14 and increase the battery capacity, thereby solving the problem of increased cost due to increased battery capacity in high-power dual electrical connector electronic devices.

[0048] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A battery protection board, characterized in that, include: At least one pair of device modules; and A circuit board includes a main circuit board and at least one pair of main circuit branches electrically connected to the main circuit board. The at least one pair of main circuit branches are bent relative to the main circuit board toward the side away from the battery cell. The device module is electrically connected to the main circuit branch and is located at the end of the main circuit branch away from the battery cell. The device module is electrically connected to the battery cell through the main circuit branch and the main circuit board.

2. The battery protection board according to claim 1, characterized in that, The at least one pair of mainboard branches bend in the same direction relative to the mainboard circuit.

3. The battery protection board according to claim 1 or 2, characterized in that, The at least one pair of motherboard branches are located on the same side of the circuit motherboard; or are located on opposite sides of the circuit motherboard.

4. The battery protection board according to claim 1 or 2, characterized in that, The at least one pair of motherboard branches are spaced apart, with a maximum spacing of at least 10 mm; and / or The maximum width of the motherboard branch is less than the maximum width of the device module.

5. The battery protection board according to claim 1, characterized in that, One side of the circuit board is provided with a pair of battery cell connection terminals for electrical connection with the battery cells; the other side of the circuit board is provided with a reinforcing plate; and / or The circuit board is a flexible circuit board.

6. The battery protection board according to claim 1, characterized in that, The battery protection board includes a pair of device modules and a power circuit, a protection circuit, and a power detection circuit respectively disposed within the pair of device modules; the power circuit includes multiple MOSFETs, wherein some of the MOSFETs are electrically connected to the protection circuit and integrated into one of the device modules, and the remaining MOSFETs are electrically connected to the power detection circuit and integrated into the other device module; and / or The device module is externally mounted on the circuit motherboard.

7. A battery module, characterized in that, include: The battery cell includes a pair of tabs; and The battery protection board as described in any one of claims 1 to 6, wherein the circuit board of the battery protection board is electrically connected to a pair of tabs of the battery cell.

8. The battery module according to claim 7, characterized in that, The battery protection board is located on top of the battery cell; wherein, in the thickness direction of the battery cell, the main circuit board of the circuit board is horizontally laid on top of the battery cell; in the thickness direction of the battery cell, the main circuit branch of the circuit board is bent upward relative to the main circuit board, so that the device module electrically connected to the main circuit branch is located above the main circuit board.

9. An electronic device, characterized in that, include: The main control board, at least one pair of electrical connectors, and a battery module as described in any one of claims 7 to 8, wherein the main control board is electrically connected to at least one pair of device modules of the battery protection board of the battery module via the at least one pair of electrical connectors.

10. The electronic device according to claim 9, characterized in that, The electrical connector is externally mounted on the main control board and is configured correspondingly to the device module.

Images