Battery protection board assembly, battery assembly and electronic equipment

Abstract

The utility model discloses a battery protection board assembly, a battery assembly and an electronic device, the battery protection board assembly comprises a first circuit board, the first circuit board is provided with at least two first connecting parts and at least one third connecting part, and the first connecting parts and the third connecting parts are opposite in polarity; the second circuit board is provided with at least two second connecting parts and at least one fourth connecting part, and the polarities of the second connecting parts and the fourth connecting parts are opposite; the second connecting part and the first connecting part are correspondingly arranged and electrically connected, and the fourth connecting part and the third connecting part are correspondingly arranged and electrically connected. By arranging the at least two first connecting parts, the at least two second connecting parts, the at least one third connecting part and the fourth connecting part, transmission of electric energy between the first circuit board and the second circuit board can be realized, a current transmission path is optimized, and heat generated by the battery protection board assembly is reduced.

Description

Technical Field

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

[0002] With the increasing demand for fast charging in mobile phones and other handheld electronic devices, the charging power of batteries is getting higher and higher, with 65W and 80W being common, and some gaming models even reaching 120W or 200W to achieve the ultimate charging. At this time, the battery protection board components are getting increasingly hot.

[0003] To reduce heat generation and minimize battery size, i.e., to make the battery protection board assembly as narrow as possible, there are many solutions on the market, such as: SIP packaging technology, which encapsulates multiple components and circuit boards by injection molding high thermal conductivity material, and then attaches them to a flexible circuit board to form a protection board.

[0004] However, the SIP packaging process significantly increases the price of circuit boards. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery protection board assembly, which, by providing at least two first connecting parts and second connecting parts, at least one third connecting part and a fourth connecting part, enables the transmission of electrical energy between a first circuit board and a second circuit board, optimizes the current transmission path, and reduces the heat generated by the battery protection board assembly.

[0006] This utility model further proposes a battery assembly.

[0007] This utility model also proposes an electronic device.

[0008] A battery protection board assembly according to a first aspect of the present invention includes: a first circuit board having at least two first connecting portions and at least one third connecting portion, wherein the first connecting portions and the third connecting portions have opposite polarities; a second circuit board having at least two second connecting portions and at least one fourth connecting portion, wherein the second connecting portions and the fourth connecting portions have opposite polarities; the second connecting portions and the first connecting portions are correspondingly disposed and electrically connected, and the fourth connecting portions and the third connecting portions are correspondingly disposed and electrically connected.

[0009] According to the battery protection board assembly of the present invention, by providing at least two first connecting parts and second connecting parts, at least one third connecting part and a fourth connecting part, the transmission of electrical energy between the first circuit board and the second circuit board can be realized, the current transmission path can be optimized, and the heat generation of the battery protection board assembly can be reduced.

[0010] According to some embodiments of the present invention, the first circuit board includes a first surface and a second surface facing away from each other; the second circuit board includes a third surface and a fourth surface facing away from each other, the second surface and the third surface being disposed opposite to each other; the first connecting portion and the third connecting portion are disposed on the second surface, the second connecting portion and the fourth connecting portion are disposed on the third surface, the second connecting portion and the first connecting portion are correspondingly disposed and electrically connected, and the fourth connecting portion and the third connecting portion are correspondingly disposed and electrically connected.

[0011] According to some embodiments of the present invention, the battery protection board assembly is provided with at least one first sub-connection portion and at least one second sub-connection portion, the first sub-connection portion and the second sub-connection portion having opposite polarities, and the first sub-connection portion and the second sub-connection portion being adapted to be electrically connected to the battery cell; the second connection portion, the first connection portion and the first sub-connection portion are electrically connected to the first sub-connection portion.

[0012] According to some embodiments of the present invention, the first sub-connection portion and the second sub-connection portion are disposed on the side of the second circuit board away from the first circuit board, or the first sub-connection portion and the second sub-connection portion are disposed on the side of the first circuit board away from the second circuit board.

[0013] According to some embodiments of the present invention, in the length direction of the battery protection board assembly, the first connecting portion and the second connecting portion are disposed close to the first sub-connecting portion relative to the second sub-connecting portion; in the length direction of the battery protection board assembly, the third connecting portion and the fourth connecting portion are disposed close to the second sub-connecting portion relative to the first sub-connecting portion.

[0014] According to some embodiments of the present invention, in the length direction of the battery protection board assembly, two second connecting portions are disposed on both sides of the first sub-connecting portion, and the first sub-connecting portion and the second connecting portion are spaced apart.

[0015] According to some embodiments of the present invention, in the length direction of the battery protection board assembly, the gap length between the first sub-connecting portion and the two adjacent second connecting portions is equal.

[0016] According to some embodiments of the present invention, in the thickness direction of the battery protection board assembly, the orthographic projection of the fourth connecting portion and the orthographic projection of the second sub-connecting portion at least partially overlap.

[0017] According to some embodiments of the present invention, the battery protection board assembly is provided with multiple components.

[0018] According to some embodiments of the present invention, the components include: at least two sets of field-effect transistors and at least two detection resistors. In the length direction of the battery protection board assembly, at least two sets of the field-effect transistors are respectively disposed close to two of the second connection portions, and at least two detection resistors are respectively disposed close to two of the second connection portions.

[0019] According to some embodiments of the present invention, the battery protection board assembly is provided with a first sub-connection portion and a second sub-connection portion suitable for electrical connection with the battery cell; there are two first connection portions, two sets of field-effect transistors, and two detection resistors; along the length direction of the battery protection board assembly, two first connection portions are provided on both sides of the first sub-connection portion; and / or, along the length direction of the battery protection board assembly, two sets of field-effect transistors are provided on both sides of the first sub-connection portion; and / or, along the length direction of the battery protection board assembly, two detection resistors are provided on both sides of the first sub-connection portion; and / or, along the length direction of the battery protection board assembly, two second connection portions are provided on both sides of the first sub-connection portion.

[0020] According to some embodiments of the present invention, the two sets of field-effect transistors are symmetrically arranged along the central axis of the first sub-connection portion; and / or, the two detection resistors are symmetrically arranged along the central axis of the first sub-connection portion; and / or, the two second connection portions are symmetrically arranged along the central axis of the first sub-connection portion; and / or, the two first connection portions are symmetrically arranged along the central axis of the first sub-connection portion.

[0021] According to some embodiments of the present invention, in the length direction of the battery protection board assembly, two second connecting portions are spaced apart, and the field-effect transistor and the detection resistor are disposed between the two second connecting portions.

[0022] According to some embodiments of the present invention, the battery protection board assembly is provided with a first sub-connection portion and a second sub-connection portion; the first sub-connection portion and the second sub-connection portion are adapted to be electrically connected to the battery cell, and the first sub-connection portion is electrically connected to two first connection portions respectively to form a first current loop and a second current loop; two sets of field-effect transistors are respectively disposed on the first circuit loop and the second current loop, and two detection resistors are respectively disposed on the first circuit loop and the second current loop.

[0023] According to some embodiments of the present invention, the third connecting part includes a plurality of third sub-connecting parts, and / or the fourth connecting part includes a plurality of fourth sub-connecting parts; the third sub-connecting parts and the fourth sub-connecting parts are provided correspondingly.

[0024] According to some embodiments of the present invention, the battery protection board assembly further includes at least two connectors connected to the battery protection board assembly, and the connectors are adapted to be electrically connected to the battery cell.

[0025] According to some embodiments of the present invention, the battery protection assembly is provided with a first sub-connecting part and a second sub-connecting part, and the two connecting members are respectively connected to the first sub-connecting part and the second sub-connecting part.

[0026] According to some embodiments of the present invention, the first circuit board is a flexible circuit board or a rigid circuit board, and the second circuit board is a flexible circuit board or a rigid circuit board.

[0027] According to some embodiments of the present invention, the first circuit board is a flexible circuit board, and the first circuit board is provided with a connector, which is suitable for electrical connection with electrical equipment; the second circuit board is a rigid circuit board.

[0028] According to some embodiments of the present invention, the battery protection board assembly is provided with a plurality of components, the components being disposed on the side of the second circuit board away from the first circuit board; the battery protection board assembly is provided with a first sub-connection portion and a second sub-connection portion, the first sub-connection portion and the second sub-connection portion being disposed on the side of the second circuit board away from the first circuit board.

[0029] According to some embodiments of the present invention, the battery protection board assembly is provided with a plurality of components, the components being disposed on the side of the second circuit board away from the first circuit board; the battery protection board assembly is provided with a first sub-connection portion and a second sub-connection portion, the first sub-connection portion and the second sub-connection portion being disposed on the side of the first circuit board away from the second circuit board.

[0030] According to some embodiments of the present invention, there are two connectors, which are spaced apart; or along the length of the battery protection board assembly, the two connectors are located at both ends of the first circuit board.

[0031] According to some embodiments of the present invention, in the length direction of the battery protection board assembly, the length of the first circuit board is longer than the length of the second circuit board.

[0032] According to some embodiments of the present invention, the first circuit board is recessed in a direction away from the second circuit board to form a groove, and the second circuit board is at least partially disposed within the groove.

[0033] A battery assembly according to a second aspect of the present invention includes a battery cell and the aforementioned battery protection board assembly, wherein the battery cell and the battery protection board assembly are connected.

[0034] According to some embodiments of the present invention, the battery protection board assembly includes a first sub-connecting portion and a second sub-connecting portion, the battery cell includes a first polarity member and a second polarity member, the first polarity member and the second polarity member have opposite polarities, the first polarity member and the first sub-connecting member are electrically connected, and the second polarity member and the second sub-connecting portion are electrically connected.

[0035] According to some embodiments of the present invention, the battery protection board assembly includes a connector, one end of which is connected to the first sub-connecting part or the second sub-connecting part, and the other end of which is connected to the first polarity member or the second polarity member.

[0036] An electronic device according to a third aspect of the present invention includes the battery assembly described above.

[0037] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0038] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0039] Figure 1 This is an exploded view of a battery according to an embodiment of the present utility model;

[0040] Figure 2 This is a schematic diagram of the structure of the battery protection board assembly according to an embodiment of the present utility model. Figure 1 ;

[0041] Figure 3 This is a schematic diagram of the structure of the battery protection board assembly according to an embodiment of the present utility model. Figure 2 ;

[0042] Figure 4 This is an exploded view of the battery protection board assembly according to an embodiment of the present utility model;

[0043] Figure 5 This is a schematic diagram of the battery pack charging circuit according to an embodiment of the present utility model. Figure 1 ;

[0044] Figure 6 This is a schematic diagram of the battery pack charging circuit according to an embodiment of the present utility model. Figure 2 .

[0045] Figure label:

[0046] 1000, Battery Components;

[0047] 100. Battery protection board assembly;

[0048] 10. First circuit board; 11. Groove; 12. First connecting plate; 13. Second connecting plate; 14. Connector; 15. First segment; 16. Second segment; 17. First connecting part; 18. Third connecting part; 19. Reinforcing piece;

[0049] 20. Second circuit board; 21. Component; 22. Second connecting part; 23. Fourth connecting part;

[0050] 30. Connectors;

[0051] 200. Battery cell; 201. First polarity component; 202. Second polarity component. Detailed Implementation

[0052] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present invention are described in detail below.

[0053] The following is for reference. Figures 1-6 The present invention describes a battery protection board assembly 100 according to an embodiment of the present invention, and also provides a battery assembly 1000, and further provides an electronic device.

[0054] Reference Figures 1-6 As shown, the battery protection board assembly 100 of this utility model embodiment...

[0055] According to an embodiment of the present invention, the battery protection board assembly 100 includes a first circuit board 10 and a second circuit board 20. The battery protection board assembly 100 is used for overcharge, over-discharge, overcurrent, short circuit and other protections in the battery 1000.

[0056] The first circuit board 10 is provided with at least two first connection portions 17 and at least one third connection portion 18, the first connection portions 17 and the third connection portions 18 having opposite polarities. The second circuit board 20 is provided with at least two second connection portions 22 and at least one fourth connection portion 23, the second connection portions 22 and the fourth connection portions 23 having opposite polarities. The first connection portions 17, the second connection portions 22, the third connection portions 18 and the fourth connection portions 23 can be solder pads.

[0057] The second connecting part 22 and the first connecting part 17 are correspondingly provided and electrically connected, and the fourth connecting part 23 and the third connecting part 18 are correspondingly provided and electrically connected. In this way, current flows from the second connecting part 22 to the first connecting part 17, and current flows from the third connecting part 18 to the fourth connecting part 23. By providing the first connecting part 17, the second connecting part 22, the third connecting part 18, and the fourth connecting part 23, an electrical connection between the first circuit board 10 and the second circuit board 20 can be realized, realizing the transmission of electrical energy between the first circuit board 10 and the second circuit board 20, optimizing the current transmission path, and reducing the heat generated by the battery protection board assembly 100.

[0058] Therefore, by providing at least two first connection parts 17 and second connection parts 22, at least one third connection part 18 and a fourth connection part 23, the transmission of electrical energy between the first circuit board 10 and the second circuit board 20 can be realized, the current transmission path can be optimized, and the heat generated by the battery protection board assembly 100 can be reduced.

[0059] In some embodiments, the first circuit board 10 includes a first surface and a second surface facing away from each other, and the second circuit board 20 includes a third surface and a fourth surface facing away from each other, with the second surface and the third surface disposed opposite to each other. A first connecting portion 17 and a third connecting portion 18 are disposed on the second surface, and a second connecting portion 22 and a fourth connecting portion 23 are disposed on the third surface. The second connecting portion 22 and the first connecting portion 17 are correspondingly disposed and electrically connected, and the fourth connecting portion 23 and the third connecting portion 18 are correspondingly disposed and electrically connected.

[0060] In other words, the first connection part 17 is located on the side of the first circuit board 10 facing the second circuit board 20, and the second connection part 22 is located on the side of the second circuit board 20 facing away from the connector 30, i.e., towards the first circuit board 10. The second connection part 22 is an output connection part, through which current flows from the second connection part 22 to the first connection part 17. The first connection part 17 and the second connection part 22 enable electrical connection between the first circuit board 10 and the second circuit board 20. The third connection part 18 is located on the side of the first circuit board 10 facing the second circuit board 20, and the fourth connection part 23 is located on the side of the second circuit board 20 facing away from the connector 30, i.e., towards the first circuit board 10. The third connection part 18 is an output connection part, through which current flows from the third connection part 18 to the fourth connection part 23. The third connection part 18 and the fourth connection part 23 enable electrical connection between the first circuit board 10 and the second circuit board 20.

[0061] Among them, there are at least two first connecting parts 17 and at least two second connecting parts 22, and at least one third connecting part 18 and at least one fourth connecting part 23. At least two first connecting parts 17 and at least two second connecting parts 22 are welded one-to-one, and at least one third connecting part 18 and at least one fourth connecting part 23 are welded one-to-one. By welding the connecting parts to each other, on the one hand, the first circuit board 10 and the second circuit board 20 can be stably fixedly connected, and on the other hand, the electrical connection between the first circuit board 10 and the second circuit board 20 can be realized by welding the connecting parts.

[0062] The second circuit board 20 is electrically connected to the first circuit board 10 by welding the connecting part, which enables the mass production of the second circuit board 20. Then, it can be used in combination with the first circuit board 10 of different shapes and sizes, thus expanding the application range and flexibility of the second circuit board 20.

[0063] Alternatively, the second circuit board 20 can be patch-connected to the first circuit board 10 via the second connection portion 22. The third surface of the second circuit board 20 can also be soldered to the second surface of the first circuit board 10 via other soldering methods. The soldering methods can be reflow soldering, pressure soldering, or other processes that can achieve soldering. The purpose is to allow current to flow from the second circuit board 20 into the first circuit board 10 through the solder joint area.

[0064] Furthermore, the battery protection board assembly 100 is provided with at least one first sub-connection portion and at least one second sub-connection portion, the first and second sub-connection portions having opposite polarities, and the first and second sub-connection portions being adapted to be electrically connected to the battery cell 200. The second connection portion 22 and the first connection portion 17 are electrically connected to the first sub-connection portion. The first and second sub-connection portions may also be solder pads.

[0065] Furthermore, the first sub-connection portion and the second sub-connection portion are provided on the fourth surface to facilitate electrical connection with the battery cell 200.

[0066] Along the length of the battery protection board assembly 100, the first connecting portion 17 and the second connecting portion 22 are disposed close to the first sub-connecting portion relative to the second sub-connecting portion, and the third connecting portion 18 and the fourth connecting portion 23 are disposed close to the second sub-connecting portion relative to the first sub-connecting portion.

[0067] Specifically, since the first sub-connection and the second sub-connection have opposite polarities, the first connection 17 and the third connection 18 have opposite polarities, and the second connection 22 and the fourth connection 23 have opposite polarities, the first connection 17 and the second connection 22 are electrically connected, the third connection 18 and the fourth connection 23 are electrically connected, and the second connection 22, the first connection 17 and the first sub-connection are electrically connected. By setting the first connection 17, the second connection 22 and the first sub-connection to have the same polarity, and the third connection 18, the fourth connection 23 and the second sub-connection to have the same polarity, during the current transmission process, the current from the cell 200 through the first sub-connection, the second connection 22 and the first connection 17 passes through the same polarity pads, and the current transmitted from the battery protection board assembly 100 back to the cell 200 passes through the third connection 18, the fourth connection 23 and the second sub-connection, all of which are the same polarity pads. This allows the conductors in the second circuit board 20 to use the maximum cross-sectional area for current transmission.

[0068] According to Ohm's Law: R = ρ × (L / S), where R is resistance, ρ is resistivity, L is the length of the conductor, and S is the cross-sectional area of ​​the conductor. When current flows through a conductor, if the cross-sectional area of ​​the conductor decreases, the current has more difficulty flowing, leading to an increase in resistance. According to Joule's Law, when current flows through a conductor, resistance causes heat to be generated, i.e.: Q = I² × R, where Q is the heat generated, I is the current, and R is the resistance. If the resistance increases, more heat is generated. This reduces the heat generated in the battery protection board assembly 100.

[0069] Thus, the first connecting part 17 and the second connecting part 22 are close to the first sub-connecting part, and the third connecting part 18 and the fourth connecting part 23 are close to the second sub-connecting part. The connecting parts with the same polarity are set in close positions, which helps to reduce the current path and reduce heat generation.

[0070] Along the length of the battery protection board assembly 100, two second connecting portions 22 are disposed on both sides of the first sub-connecting portion, with the first sub-connecting portion and the second connecting portion 22 spaced apart. Along the length of the battery protection board assembly 100, the gap length between the first sub-connecting portion and the two adjacent second connecting portions 22 is equal. That is, the distance between the two second connecting portions 22 and the first sub-connecting portion is equal, improving the stability of current transmission.

[0071] Furthermore, in the thickness direction of the second circuit board 22, the orthographic projection of the fourth connection portion 23 and the orthographic projection of the second sub-connection portion at least partially overlap, so that the current is transmitted in a straight line as much as possible to reduce the current path.

[0072] Furthermore, the battery protection board assembly 100 is provided with multiple components 21. The components 21 are used to protect the stable operation of the circuit and prevent the circuit from being damaged due to changes in voltage, current, temperature or external factors. The current transmitted by the battery cell 200 passes through the first circuit board 10 and then through the components 21 to improve the stability of the circuit.

[0073] Component 21 can be one or more of a field-effect transistor (FET), resistor, capacitor, chip, and inductor. Component 21 can be connected to the second circuit board 20 via surface mount technology (SMT). The chip can be an integrated circuit (IC), which receives signals and feeds them back to the FET, causing the FET to react accordingly. The FET acts as a switch in the circuit, opening and closing the circuit according to the instructions of the protection IC to provide overvoltage / undervoltage protection for the battery 1000. Specifically, when the IC detects an overcharge signal, it feeds an overcharge signal back to the FET, which then shuts off, stopping charging.

[0074] In some embodiments, an insulating layer may be covered on the component 21, which can provide uniform heat dissipation for the component 21. The heat generated by the component 21 during operation is dissipated through the insulating layer. Compared with air heat dissipation, the heat dissipation effect of the insulating layer is better. Furthermore, the insulating layer can also provide waterproofing and dustproofing for the component 21, improving the mechanical reliability of the battery protection board assembly 100 and ensuring its safety performance. The insulating layer is injection molded using a low-pressure injection molding process, ensuring that the gaps between the components 21 are also filled with insulation, further enhancing the protective effect of the insulating layer on the components 21. The insulating layer uses insulating materials such as epoxy resin or hot melt adhesive.

[0075] In some embodiments, the insulating layer material combines insulation with good thermal conductivity and heat dissipation, thereby improving the heat dissipation capacity of component 21. The material can be a phase change material, or it can be a heat-dissipating plastic.

[0076] In some embodiments, component 21 can be an independently packaged component 21, that is, each component 21 has its own encapsulation layer to isolate the internal components of each component 21 from the outside world, prevent external impurities from corroding its internal circuitry and causing a decline in electrical performance, and protect its surface and connecting leads from external damage and environmental influences. Combined with the aforementioned insulating layer, this provides better protection for each component 21. Thus, before the insulating layer covers the component 21, the independently packaged component 21 already possesses a certain degree of self-protection capability, facilitating storage, installation, and transportation. The encapsulation layer can be made of insulating materials, such as epoxy resin or hot melt adhesive.

[0077] In some embodiments, component 21 can be a component without independent packaging, that is, each component 21 does not have a separate independent packaging layer. This structure reduces the thickness of component 21, thereby reducing the thickness of the second circuit board 20 and the space occupied by the battery protection board assembly 100. Furthermore, eliminating the need for independent packaging reduces the material cost of component 21. An insulating layer covers the component 21 without independent packaging.

[0078] Reference Figure 2 As shown, component 21 includes at least two sets of field-effect transistors (FETs) and at least two sensing resistors. Along the length of the battery protection board assembly 100, the FETs are positioned close to the second connection portion 22, and the sensing resistors are also positioned close to the second connection portion 22. Specifically, each set of FETs may include one or two FETs. Using two FETs can distribute the current and reduce the FET temperature, but using a single FET can achieve the same protection circuit effect and reduce cost. In this embodiment, the sensing resistor can be a current-sensing resistor.

[0079] In some embodiments, the battery protection assembly 100 is provided with a first sub-connection portion and a second sub-connection portion suitable for electrical connection with the battery cell 200. There are two first connection portions 17, two sets of field-effect transistors (FETs), and two sensing resistors. Along the length of the battery protection assembly, the two first connection portions 17 are located on both sides of the first sub-connection portion; and / or, along the length of the battery protection assembly, the two sets of FETs are located on both sides of the first sub-connection portion; and / or, along the length of the battery protection assembly, the two sensing resistors are located on both sides of the first sub-connection portion; and / or, along the length of the battery protection assembly, the two second connection portions 22 are located on both sides of the first sub-connection portion. That is, some FETs and current-sensing resistors are connected in parallel and symmetrically distributed, and the first connection portions 17 and the second connection portions 22 are symmetrically arranged relative to the first sub-connection portion.

[0080] Furthermore, the two sets of field-effect transistors are symmetrically arranged along the central axis of the first sub-connection portion; and / or, the two sensing resistors are symmetrically arranged along the central axis of the first sub-connection portion; and / or, the two second connection portions 22 are symmetrically arranged along the central axis of the first sub-connection portion; and / or, the two first connection portions 17 are symmetrically arranged along the central axis of the first sub-connection portion.

[0081] Furthermore, along the length of the battery protection board assembly 100, two second connection portions 22 are spaced apart, and the field-effect transistor and the sensing resistor are located between the two second connection portions 22.

[0082] The battery protection board assembly includes a first sub-connection portion and a second sub-connection portion, which are adapted to be electrically connected to the battery cell. The first sub-connection portion is electrically connected to two first connection portions 17 to form a first current loop and a second current loop, respectively. Two sets of field-effect transistors are respectively disposed on the first circuit loop and the second current loop, and two sensing resistors are respectively disposed on the first circuit loop and the second current loop. Specifically, in this embodiment, component 21 may include four field-effect transistors and two sensing resistors, wherein the sensing resistors are current-sensing resistors. In other embodiments, there may be two field-effect transistors.

[0083] Reference Figure 3-4 As shown, the third connecting part 18 includes multiple third sub-connecting parts, and the fourth connecting part 23 includes multiple fourth sub-connecting parts. The third and fourth sub-connecting parts are correspondingly arranged. In this embodiment, the third connecting part 18 and the fourth connecting part 23 each have five third and five fourth sub-connecting parts. Multiple third and fourth sub-connecting parts can form a group, with each group arranged along the length or width direction of the first circuit board 10 and the second circuit board 20. The multiple third and fourth sub-connecting parts correspond one-to-one. By uniformly arranging multiple third and fourth sub-connecting parts of uniform shape and size, the temperature of the soldering area of ​​the first circuit board 10 and the second circuit board 20 can be effectively uniform, thereby reducing the temperature rise of the second circuit board 20. Some of the third and fourth sub-connecting parts can be used to transmit electrical signals.

[0084] Furthermore, the shape and size of the third and fourth sub-connecting parts can be set according to actual needs, and different third and fourth sub-connecting parts can be set to the same or different shapes and sizes as needed.

[0085] Reference Figure 4 As shown, the battery protection board assembly 100 also includes at least two connectors 30. The first end of each connector 30 is connected to the battery protection board assembly 100, and the connector 30 is adapted to be electrically connected to the battery cell 200. That is, the battery cell 200 is first connected to the connector 30, and the connector 30 is connected to one side of the second circuit board 20. The first circuit board 10 is connected to the other side of the second circuit board 20, i.e., the side without the connector 30. During charging, current flows from the battery cell 200 to the connector 30, then through the second circuit board 20 and the first circuit board 10 into the electrical device for energy transfer. After passing through the load of the electrical device, the current flows back into the battery cell 200 through the first circuit board 10, the second circuit board 20, and the connector 30, thus achieving a closed-loop current circuit. The discharging process is the reverse loop.

[0086] According to Ohm's Law: R = ρ × (L / S), where R is resistance, ρ is resistivity, L is the length of the conductor, and S is the cross-sectional area of ​​the conductor. When current flows through a conductor, if the cross-sectional area of ​​the conductor decreases, the current has more difficulty flowing, leading to an increase in resistance. According to Joule's Law, when current flows through a conductor, resistance causes heat to be generated, i.e.: Q = I² × R, where Q is the heat generated, I is the current, and R is the resistance. If the resistance increases, more heat is generated.

[0087] If a connector 30 is provided on the first circuit board 10, it reduces the effective area of ​​the conductor, thus obstructing the current flow in that area. The surface area occupied by the connector 30 narrows the path for current to pass through, resulting in an increase in local resistance. Due to the increased resistance generated when current passes through a smaller conductor path, the local temperature rises, leading to more heat accumulation.

[0088] In this way, the connector 30 does not occupy the surface area of ​​the first circuit board 10. The battery cell 200 is first connected to the second circuit board 20, and then connected to the first circuit board 10 through the second circuit board 20. The first circuit board 10 is electrically connected to the electrical device, thereby realizing the transmission of electrical energy to the electrical device. This can effectively reduce the heat generation of the battery protection board assembly 100 and optimize the current transmission path.

[0089] The connector 30 can be a metal connector piece, which can be attached to the second circuit board 20 by means of a surface mount.

[0090] Furthermore, the fourth surface is provided with a first sub-connecting portion and a second sub-connecting portion, and the first ends of the two connectors 30 are respectively connected to the first sub-connecting portion and the second sub-connecting portion.

[0091] It should also be noted that the first circuit board 10 is either a flexible circuit board or a rigid circuit board, and the second circuit board 20 is either a flexible circuit board or a rigid circuit board. Flexible circuit boards are characterized by being bendable, rollable, and foldable. By using flexible circuit boards, the overall volume of the battery protection board assembly 100 can be reduced, enabling the product to develop towards high density, miniaturization, and high reliability. The flexible circuit board includes polyimide or polyester film, and is flexibly connected to the power supply. Rigid circuit boards are characterized by high density, high reliability, designability, manufacturability, and testability. Furthermore, rigid circuit boards have better heat dissipation and higher strength than flexible circuit boards. As a circuit board with protective functions in the battery protection board assembly 100, the rigid circuit board provides stronger support, fixing the battery 1000 protection circuit and other electrical components 21, ensuring the safety of the battery 1000. The rigid circuit board includes at least one of phenolic paper laminate, epoxy paper laminate, polyester glass mat laminate, and epoxy glass cloth laminate.

[0092] Specifically, in this embodiment, the first circuit board 10 is a flexible circuit board, and the second circuit board 20 is a rigid circuit board. The first circuit board 10 is provided with a connector 14, which is adapted to be electrically connected to the electrical equipment. Electrical signals can be transmitted between the second circuit board 20 and the first circuit board 10, and transmitted to the electrical equipment through the connector 14.

[0093] There are at least two connectors 14, which are spaced apart, or two connectors 14 are located at both ends of the first circuit board 10 along the length of the battery protection board assembly 100. A certain distance is provided between the two connectors 14. On the one hand, this allows the first circuit board 10 to have a current-shunting function, allowing current to flow from the second circuit board 20 to the connectors 14 at both ends of the first circuit board 10, or from the connectors 14 at both ends of the first circuit board 10 to the second circuit board 20, preventing overheating of the second circuit board 20 due to overcurrent, and achieving heat dissipation for the second circuit board 20. This allows the battery protection board assembly 100 to be connected to high-power electrical equipment. On the other hand, it facilitates the assembly and connection of the first circuit board 10 with the equipment to be powered.

[0094] Reference Figures 2-6 As shown, in this embodiment, two connectors 14 are provided, each located at one end of the first circuit board 10. The connectors 14 are connected to the electrical device. Current flows from the first circuit board 10 to the connectors 14, and then from the connectors 14 to the electrical device. Current can also flow from the electrical device to the connectors 14, and then back to the first circuit board 10. Specifically, the first circuit board 10 includes a first segment 15 and two second segments 16 formed by bending from both ends of the first segment 15. The second segments 16 are connected to the connectors 14. The first segment 15 is a long plate, and the two second segments 16 are connected to both sides of the first segment 15. Current flows through the first segment 15 to the second segments 16 and the connectors 14 connected to the second segments 16, thus transmitting to the electrical device. Current can also flow from the electrical device to the connectors 14, and then back to the first segment 15 via the second segments 16.

[0095] In addition, at least one gold finger or spring can be provided at each end of the first circuit board 10 to make contact with conductive structures or devices, so as to replace the function of connector 14.

[0096] In some embodiments, the battery protection board assembly 100 may further include a reinforcing piece 19, wherein at least two reinforcing pieces 19 are provided, and the at least two reinforcing pieces 19 are respectively provided at both ends of the first circuit board 10. Each reinforcing piece 19 corresponds to one connector 14. The reinforcing piece 19 is used to strengthen the connection between the connector 14 and the first circuit board 10, so that the connector 14 is securely connected to the first circuit board 10 and prevents the connector 14 from falling off the first circuit board 10.

[0097] Two connectors 14 are respectively located on the side of the first circuit board 10 away from the second circuit board 20, and two reinforcing pieces 19 are respectively located on the side of the first circuit board 10 facing the second circuit board 20, and respectively strengthen the connection between the two connectors 14 and the first circuit board 10.

[0098] In some embodiments, the battery protection board assembly 100 is provided with a plurality of components 21, the components 21 being disposed on the side of the second circuit board 20 away from the first circuit board 10, and the battery protection board assembly 100 is provided with a first sub-connection portion and a second sub-connection portion, the first sub-connection portion and the second sub-connection portion being disposed on the side of the second circuit board 20 away from the first circuit board 10.

[0099] In some embodiments, the battery protection board assembly 100 is provided with a plurality of components 21, which are located on the side of the second circuit board 20 away from the first circuit board 10; the battery protection board assembly 100 is provided with a first sub-connection portion and a second sub-connection portion, which are located on the side of the first circuit board 10 away from the second circuit board 20.

[0100] Reference Figures 2-6 As shown, in the length direction of the battery protection board assembly 100, the length of the first circuit board 10 is longer than the length of the second circuit board 20. That is, the first circuit board 10 extends beyond both sides of the second circuit board in the length direction. In this way, the first circuit board 10 has greater flexibility and can connect to different electrical devices. It helps to optimize the wiring and installation of the protection circuit board. By increasing the length of the first circuit board 10, the current transmission lines of the second circuit board 20 can be extended through the first circuit board 10 to other places that need to be connected. This not only saves space, but also avoids too many restrictions on the design and wiring of the second circuit board 20.

[0101] Reference Figure 1 As shown, the first circuit board 10 is recessed in a direction away from the second circuit board 20 to form a groove 11, and the second circuit board 20 is at least partially disposed within the groove 11. The groove 11 design saves space by embedding the second circuit board 20 into the groove 11 of the first circuit board 10, resulting in a more compact layout between the two circuit boards and reducing equipment size. During manufacturing and assembly, the groove 11 serves as a guide for the mating of the first circuit board 10 and the second circuit board 20, making the installation of the second circuit board 20 simpler and more precise. Avoiding manual adjustments or asymmetrical installation methods helps improve production efficiency and assembly quality.

[0102] Specifically, the first circuit board 10 includes a first connecting plate 12 and two second connecting plates 13. The two second connecting plates 13 are connected to both ends of the first connecting plate 12. A bending portion is provided between the second connecting plate 13 and the first connecting plate 12, and a groove 11 is formed between the bending portion and the first connecting plate 12. By forming the groove 11 between the bending portion and the first connecting plate 12, the first circuit board 10 has a certain rigidity and resistance, effectively disperses external stress, and enhances the bending resistance and deformation resistance of the first circuit board 10.

[0103] According to a second aspect embodiment of the present invention, a battery 1000 includes a battery cell 200 and the aforementioned battery protection board assembly 100, wherein the battery cell 200 and the battery protection board assembly 100 are electrically connected.

[0104] Reference Figure 1 and Figure 6 As shown, the battery protection board assembly 100 includes a first sub-connection portion and a second sub-connection portion. The battery cell 200 includes a first polarity member 201 and a second polarity member 202. The first polarity member 201 and the second polarity member 202 have opposite polarities. The first polarity member 201 is electrically connected to the first sub-connection portion, and the second polarity member 202 is electrically connected to the second sub-connection portion. Specifically, the battery cell 200 includes at least two polarity members. In this embodiment, the first polarity member 201 is a negative polarity member, and the second polarity member 202 is a positive polarity member. The first polarity member 201 and the second polarity member 202 are electrically connected to the first or second sub-connection portion corresponding to their polarity for current transmission.

[0105] The first polarity component 201 can be a negative terminal, and the second polarity component 202 can be a positive terminal.

[0106] In addition, if there are two or more first polarity elements 201, multiple first polarity elements 201 can also correspond to a first sub-connection part, reducing the current path.

[0107] According to some embodiments of this utility model, the battery protection board assembly 100 includes a connector 30. One end of the connector 30 is connected to a first sub-connecting portion or a second sub-connecting portion, and the other end of the connector 30 is connected to a first polarity member 201 or a second polarity member 202. That is, the number of connectors 30 is consistent with the number of polarity members. The first polarity member 201 and the second polarity member 202 are respectively connected to the connector 30 by laser welding, realizing the transmission of electrical energy from the battery cell 200 to the protection circuit board, and finally to the electrical device, forming a current loop with the electrical device, thus realizing the transmission of electrical energy between the battery cell 200 and the electrical device.

[0108] In summary, referring to Figures 5-6As shown, during the charging process, the current flows from the first polarity element 201 through the connector 30 into the second circuit board 20, and then splits to the left and right ends of the second circuit board 20. Approximately half of the current flows to the left, passing through the current sensing resistor and the field-effect transistor (FET). Depending on the different currents, different protection strategies are applied. The FET can provide primary protection, or the FET can be doubled to achieve secondary protection. The other half of the current moves to the right, flowing through the current sensing resistor and the FET, and then through the first connection part 17 and the second connection part 22 into the first circuit board 10.

[0109] In the first circuit board 10, the left branch flows through the first connection 17 on the left and then through the connector 14, while the right branch flows through the first connection 17 on the right and then through the connector 14. The current converges in the electrical equipment, passes through the load of the equipment, then diverges again, flowing through the connector 14 and the first circuit board 10, then through the third connection 18 and the fourth connection 23 into the second circuit board 20. Finally, the current converges at the polarity connector of the second polarity component 202 and enters the battery cell 200, thus completing the closed-loop current circuit. The discharge process is the reverse of the above circuit.

[0110] Furthermore, the first connecting part 17 and the second connecting part 22 can be negative electrode connecting parts, the third connecting part 18 and the fourth connecting part 23 can be positive electrode connecting parts, the connecting part 30 connected to the first polarity member 201 is a negative electrode connecting part 30, the negative electrode connecting parts are symmetrically distributed on both sides of the negative polarity member connecting piece of the second circuit board 20, and the current sensing resistor and field effect transistor connected in parallel are also symmetrically distributed relative to the negative electrode connecting part 30. The connector 30 connected to the second polarity component 202 is the positive connector 30. In this way, in the charging current circuit of the battery 1000, the current flows into the second circuit board 20 through the negative polarity component and the negative connector 30 of the cell 200. The current shunt circuit passes through the field effect transistor and the current sensing resistor and then connects to the first circuit board 10 through the first connection part 17 and the second connection part 22. It does not overlap with the IC, other resistors and capacitors, and the positive connector 30 in the thickness direction, so that the maximum cross-sectional area of ​​the second circuit board 20 is used for the main circuit current. The current shunt circuit flows to the first circuit board 10 after passing through the negative connector.

[0111] Thus, the current flow path in the second circuit board 20 does not cross opposite polarity connections, ICs, or other resistors and capacitors. This allows the conductors in the second circuit board 20 to utilize their maximum cross-sectional area for transmitting the power current. According to Ohm's Law: R = ρ × (L / S), where R is the resistance, ρ is the resistivity, L is the length of the conductor, and S is the cross-sectional area of ​​the conductor. When current flows through the conductor, the cross-sectional area of ​​the conductor increases, and the internal resistance R of the conductor decreases. At this time, according to the heating formula Q = IRt, under the same charging power and the same charging time, a smaller R results in less heat generation, effectively reducing heat generation on the protection circuit board.

[0112] An electronic device according to a third aspect embodiment of the present invention includes a battery 1000. The electronic device in this embodiment is not particularly limited and can be any electronic device known in the prior art. In some embodiments, the electronic device can be a mobile phone, laptop computer, tablet computer, wearable device, game console, etc.

[0113] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0114] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0115] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery protection board assembly, characterized in that, include: A first circuit board is provided with at least two first connecting portions and at least one third connecting portion, wherein the first connecting portions and the third connecting portions have opposite polarities; The second circuit board is provided with at least two second connecting portions and at least one fourth connecting portion, wherein the second connecting portions and the fourth connecting portions have opposite polarities; The second connecting part and the first connecting part are correspondingly provided and electrically connected, and the fourth connecting part and the third connecting part are correspondingly provided and electrically connected.

2. The battery protection board assembly according to claim 1, characterized in that, The first circuit board includes a first surface and a second surface that are opposite to each other; The second circuit board includes a third surface and a fourth surface facing away from each other, the second surface and the third surface being disposed opposite to each other; The first connecting portion and the third connecting portion are disposed on the second surface, and the second connecting portion and the fourth connecting portion are disposed on the third surface. The second connecting portion and the first connecting portion are correspondingly disposed and electrically connected, and the fourth connecting portion and the third connecting portion are correspondingly disposed and electrically connected.

3. The battery protection board assembly according to claim 1, characterized in that, The battery protection board assembly has at least one first sub-connection portion and at least one second sub-connection portion, the first sub-connection portion and the second sub-connection portion having opposite polarities, and the first sub-connection portion and the second sub-connection portion being adapted to be electrically connected to the battery cell; The second connecting part, the first connecting part, and the first sub-connecting part are electrically connected.

4. The battery protection board assembly according to claim 3, characterized in that, The first sub-connection portion and the second sub-connection portion are located on the side of the second circuit board away from the first circuit board, or the first sub-connection portion and the second sub-connection portion are located on the side of the first circuit board away from the second circuit board.

5. The battery protection board assembly according to claim 4, characterized in that, Along the length of the battery protection board assembly, the first connecting portion and the second connecting portion are disposed close to the first sub-connecting portion relative to the second sub-connecting portion; Along the length of the battery protection board assembly, the third and fourth connecting portions are disposed close to the second sub-connecting portion relative to the first sub-connecting portion.

6. The battery protection board assembly according to claim 5, characterized in that, Along the length of the battery protection board assembly, two second connecting portions are disposed on both sides of the first sub-connecting portion, with the first sub-connecting portion and the second connecting portion spaced apart.

7. The battery protection board assembly according to claim 6, characterized in that, Along the length of the battery protection board assembly, the gap length between the first sub-connecting portion and the two adjacent second connecting portions is equal.

8. The battery protection board assembly according to claim 4, characterized in that, In the thickness direction of the second circuit board, the orthographic projection of the fourth connecting portion and the orthographic projection of the second sub-connecting portion at least partially overlap.

9. The battery protection board assembly according to claim 1, characterized in that, The battery protection board assembly is equipped with multiple components.

10. The battery protection board assembly according to claim 9, characterized in that, The components include at least two sets of field-effect transistors and at least two sensing resistors. Along the length of the battery protection board assembly, at least two sets of the field-effect transistors are respectively disposed near two of the second connection portions, and at least two of the sensing resistors are respectively disposed near two of the second connection portions.

11. The battery protection board assembly according to claim 10, characterized in that, The battery protection board assembly is provided with a first sub-connection portion and a second sub-connection portion suitable for electrical connection with the battery cell. There are two first connection parts, two sets of field-effect transistors, and two detection resistors; Along the length of the battery protection board assembly, two first connecting portions are disposed on both sides of the first sub-connecting portion; and / or, Along the length of the battery protection board assembly, two sets of the field-effect transistors are disposed on both sides of the first sub-connection portion; and / or, Along the length of the battery protection board assembly, two detection resistors are disposed on both sides of the first sub-connection portion; and / or, Along the length of the battery protection board assembly, two second connecting portions are disposed on both sides of the first sub-connecting portion.

12. The battery protection board assembly according to claim 11, characterized in that, The two sets of field-effect transistors are symmetrically arranged along the central axis of the first sub-connection; and / or, The two detection resistors are symmetrically arranged along the central axis of the first sub-connection portion; and / or, The two second connecting portions are symmetrically arranged along the central axis of the first sub-connecting portion; and / or, The two first connecting parts are symmetrically arranged along the central axis of the first sub-connecting parts.

13. The battery protection board assembly according to claim 10, characterized in that, Along the length of the battery protection board assembly, two second connection portions are spaced apart, and the field-effect transistor and the detection resistor are located between the two second connection portions.

14. The battery protection board assembly according to claim 10, characterized in that, The battery protection board assembly is provided with a first sub-connection part and a second sub-connection part; The first sub-connection portion and the second sub-connection portion are adapted to be electrically connected to the battery cell; The first sub-connecting portion is electrically connected to the two first connecting portions respectively to form a first current loop and a second current loop; The two sets of field-effect transistors are respectively disposed in the first current loop and the second current loop, and the two detection resistors are respectively disposed in the first current loop and the second current loop.

15. The battery protection board assembly according to claim 1, characterized in that, The third connecting part includes a plurality of third sub-connecting parts, and / or the fourth connecting part includes a plurality of fourth sub-connecting parts; The third sub-connecting part and the fourth sub-connecting part are provided correspondingly.

16. The battery protection board assembly according to any one of claims 1-15, characterized in that, It also includes at least two connectors connected to the battery protection board assembly, the connectors being adapted to be electrically connected to the battery cells.

17. The battery protection board assembly according to claim 16, characterized in that, The battery protection board assembly has a first sub-connection part and a second sub-connection part, and the two connectors are respectively connected to the first sub-connection part and the second sub-connection part.

18. The battery protection board assembly according to any one of claims 1-15, characterized in that, The first circuit board is a flexible circuit board or a rigid circuit board, and the second circuit board is a flexible circuit board or a rigid circuit board.

19. The battery protection board assembly according to claim 18, characterized in that, The first circuit board is a flexible circuit board, and the first circuit board is provided with a connector, which is adapted to be electrically connected to electrical equipment; The second circuit board is a rigid circuit board.

20. The battery protection board assembly according to claim 19, characterized in that, The battery protection board assembly includes multiple components, which are located on the side of the second circuit board away from the first circuit board. The battery protection board assembly includes a first sub-connection portion and a second sub-connection portion, which are located on the side of the second circuit board away from the first circuit board.

21. The battery protection board assembly according to claim 19, characterized in that, The battery protection board assembly includes multiple components, which are located on the side of the second circuit board away from the first circuit board; the battery protection board assembly includes a first sub-connection portion and a second sub-connection portion, which are located on the side of the first circuit board away from the second circuit board.

22. The battery protection board assembly according to claim 19, characterized in that, There are two connectors, which are spaced apart; or, along the length of the battery protection board assembly, the two connectors are located at both ends of the first circuit board.

23. The battery protection board assembly according to any one of claims 1-15, characterized in that, In the length direction of the battery protection board assembly, the length of the first circuit board is longer than the length of the second circuit board.

24. The battery protection board assembly according to claim 23, characterized in that, The first circuit board is recessed in a direction away from the second circuit board to form a groove, and the second circuit board is at least partially disposed within the groove.

25. A battery assembly, characterized in that, include: The battery cell, and the battery protection board assembly according to any one of claims 1-24, wherein the battery cell and the battery protection board assembly are electrically connected.

26. The battery assembly according to claim 25, characterized in that, The battery protection board assembly includes a first sub-connection portion and a second sub-connection portion. The battery cell includes a first polarity component and a second polarity component. The first polarity component and the second polarity component have opposite polarities. The first polarity component is electrically connected to the first sub-connection portion, and the second polarity component is electrically connected to the second sub-connection portion.

27. The battery assembly according to claim 26, characterized in that, The battery protection board assembly includes a connector, one end of which is connected to the first sub-connection portion or the second sub-connection portion, and the other end of which is connected to the first polarity component or the second polarity component.

28. An electronic device, characterized in that, include: The battery assembly as described in any one of claims 25-27.

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