Battery protection board, battery device and electric equipment

Abstract

The battery protection board comprises a circuit board and a first conductive member, the circuit board comprises a board body, a first conductive path and a second conductive path, the first conductive path and the second conductive path are arranged on the board body and are insulated from each other, the first conductive path is suitable for being electrically connected with a first electrode of a battery cell, and the second conductive path is suitable for being electrically connected with a second electrode of the battery cell. The second conductive path is suitable for being electrically connected with a second electrode of the cell, and the first electrode and the second electrode are opposite in polarity; the first conductive member is attached to the board body and is connected in parallel with at least part of the first conductive path. The first conductive member is arranged to be in parallel connection with at least part of the first conductive path of the circuit board, and the first conductive member and the circuit board are directly mounted into a whole, so that internal wiring of the board body is reduced, the internal space of the board body is saved, additional assembly is not needed, procedures can be reduced, the cost is reduced, and automatic mass production is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery protection plate, a battery device and electrical equipment. Background Art

[0002] With the rapid development of mobile phone fast charging technology, high-power charging has higher and higher requirements for batteries. When charging and discharging at high currents, the temperature rise requirements for batteries are also relatively high, which poses a great challenge to the design of battery protection boards and structural parts.

[0003] The existing battery protection board adds an additional conductive component outside the circuit board to reduce the internal resistance of the battery. The conductive component needs to be additionally welded to the battery cell and the protection board, which has a complicated process and high cost. Utility Model Content

[0004] The utility model aims to provide a battery protection plate, a battery device and an electrical equipment, which can reduce the process and lower the cost.

[0005] In order to achieve the purpose of the utility model, the utility model provides the following technical solutions:

[0006] In a first aspect, the utility model provides a battery protection board, comprising a circuit board and a first conductive component, the circuit board comprising a board body, a first conductive path and a second conductive path, the first conductive path and the second conductive path are both arranged on the board body and insulated from each other, the first conductive path is suitable for being electrically connected to a first electrode of a battery cell, the second conductive path is suitable for being electrically connected to a second electrode of the battery cell, and the polarities of the first electrode and the second electrode are opposite; the first conductive component is mounted on the board body and is connected in parallel with at least part of the first conductive path.

[0007] In one embodiment, the board body includes a first surface and a second surface opposite to each other, the battery protection board also includes a first pad, the first pad is arranged on the first surface, the first conductive component is mounted on the second surface, and the first conductive component and the first conductive path are both electrically connected to the first pad.

[0008] In one embodiment, the board body is provided with a via hole penetrating the first surface and the second surface, and the first conductive component is electrically connected to the first pad through the via hole.

[0009] In one embodiment, the battery protection board further includes an electronic component, the electronic component is mounted on the second surface, and the electronic component is spaced apart from the first conductive component.

[0010] In one embodiment, the circuit board is covered with a first insulating layer, and / or the first conductive component is covered with a second insulating layer.

[0011] In one embodiment, the battery protection board further includes a second pad, the second pad is disposed on the first surface and spaced apart from the first pad, and the second pad is electrically connected to the second conductive path.

[0012] In one embodiment, the first conductive component is coated with a first insulating layer, and / or the circuit board and the first conductive component are coated with a second insulating layer.

[0013] In one embodiment, the battery protection board further includes a second conductive component, which is mounted on the board body and connected in parallel with at least a portion of the second conductive path.

[0014] In one embodiment, the battery protection board also includes a first flexible extension board and a second flexible extension board, the first flexible extension board and the second flexible extension board are respectively connected to the circuit board, and the first conductive path and the second conductive path are electrically connected to the first flexible extension board, and the first conductive member is electrically connected to the second flexible extension board.

[0015] In one embodiment, the circuit board further includes a third conductive path, the third conductive path is disposed on the board body and is insulated from the first conductive path and the second conductive path, and the third conductive path is electrically connected to the second flexible extension board.

[0016] In a second aspect, the utility model further provides a battery device, comprising a battery cell and a battery protection plate as described in any one of the various embodiments of the first aspect, wherein the battery cell is connected to the first electrode and the second electrode, the first conductive path is electrically connected to the first electrode, and the second conductive path is electrically connected to the second electrode.

[0017] In a third aspect, the utility model further provides an electrical device, characterized in that it comprises an electrical device and a battery device as described in the second aspect, wherein the battery device supplies power to the electrical device.

[0018] By arranging a circuit board and a first conductive component, the first conductive path and the second conductive path of the circuit board are arranged at intervals on the board body of the circuit board, the first conductive path is electrically connected to the first electrode of the battery cell, and the second conductive path is electrically connected to the second electrode of the battery cell with opposite polarity. The circuit where the first conductive component is located is connected in parallel with at least part of the first conductive path. The first conductive component is directly mounted on the circuit board as a whole without the need for additional assembly, which can reduce the number of processes, reduce costs, and facilitate automated mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 is a front view of a battery device according to an embodiment;

[0021] Figure 2 is a front view of a battery cell of an embodiment;

[0022] Figure 3 is a front view of a battery device in which a battery protection plate is unfolded according to an embodiment;

[0023] Figure 4 is a rear view of a battery device with a battery protection plate in an unfolded state according to an embodiment;

[0024] Figure 5 is a schematic diagram of a battery device according to an embodiment;

[0025] Figure 6 It is a rear view of a battery device with a battery protection plate in an unfolded state according to another embodiment.

[0026] Description of reference numerals:

[0027] 100-battery device;

[0028] 10-battery core, 11-second electrode, 12-first electrode;

[0029] 20-battery protection board, 21-circuit board, 211-board body, 212-first conductive path, 213-second conductive path, 214-first surface, 215-second surface, 216-third conductive path, 22-first conductive member, 221-first patch pad, 222-second patch pad, 23-first pad, 24-second pad, 25-electronic component, 26-first flexible extension board, 261-first output end, 27-second flexible extension board, 271-second output end;

[0030] 30- first connecting piece;

[0031] 40- Second connecting piece. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a central component at the same time.

[0034] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in the present invention includes any and all combinations of one or more related listed items.

[0035] In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail below. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0036] The embodiment of the utility model provides an electric device, including an electric device and a battery device in the embodiment of the utility model, and the battery device supplies power to the electric device.

[0037] Optionally, the power-consuming device may be a mobile phone, an electric vehicle, a hybrid vehicle, a base station, a household power load, etc.

[0038] Optionally, the battery device may be a power battery device, an energy storage battery device, etc., without specific limitation.

[0039] The electrical equipment adopts the battery device in the embodiment of the utility model, which can reduce the process and reduce the cost.

[0040] Please refer to Figure 1 The embodiment of the present invention further provides a battery device 100, including a battery cell 10 and a battery protection board 20 in the embodiment of the present invention.

[0041] First define the direction, such as Figure 1 X is the length direction of the battery cell 10.

[0042] Optionally, the battery cell 10 may be a soft-pack battery cell 10, a steel-shell battery cell 10, etc., without limitation.

[0043] Optional, such as Figure 1 The battery cell 10 is a steel shell battery cell 10. Optionally, one end of the battery cell 10 in the length direction X is connected to a first electrode 12 and a second electrode 11, and the first electrode 12 and the second electrode 11 have opposite polarities.

[0044] Optionally, the first electrode 12 is a positive electrode ear, the second electrode 11 is a negative electrode ear, and the positive electrode ear and the negative electrode ear are arranged on the same side of the battery cell 10; or Figure 2 As shown, one end of the battery cell 10 in the length direction X includes a cover plate and a rivet, the first electrode 12 of the battery cell 10 is a rivet with positive polarity, and the second electrode 11 of the battery cell 10 is a cover plate with negative polarity. The above methods are all possible and are not specifically limited.

[0045] Optionally, in another embodiment, as Figure 6 As shown, the battery cell 10 is a soft-pack battery cell 10. One end of the battery cell 10 in the length direction X is connected to a first electrode 12 and a second electrode 11, the first electrode 12 is a positive polarity, and the second electrode 11 is a negative polarity.

[0046] Optionally, the battery protection plate 20 is disposed at one end of the battery cell 10 connected to the first electrode 12 and the second electrode 11 in the length direction X.

[0047] Optionally, the number of battery cells 10 can be one or more, without limitation. When there are multiple battery cells 10, the multiple battery cells 10 are electrically connected. The battery protection board 20 can also be used in multi-series battery packs or multi-parallel battery packs, such as 2S1P, 3S1P, 4S1P, 2S2P, 3S2P and other different series-parallel structures, where 1S indicates that the number of battery cells 10 in series is 1, 1S indicates that the number of batteries in parallel is 1, and so on.

[0048] Optionally, the battery device 100 further includes a housing, which includes a bottom plate and a plurality of side plates, which are connected to the bottom plate and enclose a receiving cavity. The receiving cavity is open at one end opposite to the bottom plate, and the battery cell 10 is received in the receiving cavity.

[0049] The shell is a material with high structural strength, specifically metal materials, high-strength plastics, ceramics, etc. Metal materials such as aluminum, aluminum alloys, magnesium alloys, iron and iron alloys, etc. The shell can be an integrated structure, that is, the bottom plate and the side plates are an integrated structure made by an integrated molding process, and the integrated molding process can be specifically stamping, casting, etc., without limitation. The shell can also be a split structure, and the side plates and the bottom plate can be connected and fixed by welding, bonding, clamping, screwing, etc. The wall thickness of the shell can be roughly uniform everywhere, that is, the thickness of the side plates can be roughly uniform, and the thickness of the bottom plate and the side plates can also be roughly the same.

[0050] Optionally, the battery device 100 further includes a top plate, which is connected to the opening of the shell to close the accommodating cavity. The top plate and the shell may be connected by welding, bonding, clamping, screwing, etc., without limitation. The shape of the top plate may be substantially the same as that of the bottom plate.

[0051] The battery device 100 in the embodiment of the present invention can reduce the number of processes and reduce the cost by adopting the battery protection plate 20 in the embodiment of the present invention.

[0052] The battery protection board 20 in the embodiment of the utility model is described in detail below.

[0053] Please refer to Figure 3 and Figure 5 An embodiment of the utility model provides a battery protection board 20, including a circuit board 21 and a first conductive component 22.

[0054] Optionally, the circuit board 21 includes a board body 211, a first conductive path 212 and a second conductive path 213, the first conductive path 212 and the second conductive path 213 are spaced apart from each other on the board body 211, the first conductive path 212 is suitable for being electrically connected to the first electrode 12 of the battery cell 10, and the second conductive path 213 is suitable for being electrically connected to the second electrode 11 of the battery cell 10.

[0055] Optionally, the circuit board 21 can be a circuit board 21 commonly used in the art, such as a flexible circuit board 21, a rigid circuit board 21, a hard-soft integrated circuit board 21, a hard-soft combined circuit board 21, a printed circuit board 21 (PCB), a ceramic circuit board 21, etc., without specific limitation.

[0056] Optionally, the board body 211 of the circuit board 21 includes a printed circuit board part and a flexible circuit board part, and the two are combined into the board body 211 through a board making process.

[0057] Optionally, the shape of the plate body 211 can be rectangular, square, circular, irregular polygonal, etc., without specific limitation.

[0058] Optionally, the first conductive path 212 and the second conductive path 213 are internal wirings of the circuit board 21 , and the first conductive path 212 and the second conductive path 213 are arranged inside the board body 211 , and the wirings can be arranged manually or by an automatic wiring tool, without specific limitation.

[0059] Optionally, one of the first conductive path 212 and the second conductive path 213 is connected to the cover plate of the battery cell 10 , and the other is connected to the rivet of the battery cell 10 .

[0060] Optionally, the first conductive component 22 is mounted on the board 211 , and the circuit where the first conductive component 22 is located is connected in parallel with the circuit of the first conductive path 212 .

[0061] Optionally, the first conductive component 22 is a block-shaped rectangular conductive component, and the material of the first conductive component 22 can be copper, aluminum, silver, steel, etc., without specific limitation.

[0062] Optionally, the first conductive member 22 is mounted on the board 211 by surface mounting technology (SMT). This technology can directly mount components on the surface of the circuit board 21, rather than inserting components into slots of the circuit board 21 like a traditional PCB board. SMT patch technology has the advantages of high assembly density, high reliability, strong vibration resistance, and easy automation.

[0063] Optionally, the circuit board 21 includes a first patch pad 221 and a second patch pad 222 , and when the first conductive component 22 is mounted on the board body 211 , it is mounted on the first patch pad 221 and the second patch pad 222 , respectively.

[0064] Optionally, the first conductive member 22 is made of copper, and the connection between the first conductive member 22 and the first patch pad 221 and the connection between the first conductive member 22 and the second patch pad 222 needs to be tinned, so that the first conductive member 22 can achieve SMT patch conditions. If the first conductive member 22 of other conductive materials is used, it must also meet the SMT patch conditions. The tinned area on the first conductive member 22 must meet the soldering tensile requirements while meeting the patch conditions to prevent the patch from falling off.

[0065] Optionally, the first patch pad 221 and the second patch pad 222 each include a plurality of sub-pads to increase the welding tension of the first patch pad 221 and the second patch pad 222 on the first conductive member 22, thereby preventing the first conductive member 22 from falling off. The connection between the plurality of sub-pads and the first conductive member 22 also needs to be tinned.

[0066] Optionally, the battery protection board 20 also includes a first flexible extension board 26 and a second flexible extension board 27, which are respectively connected to the circuit board 21, and the first conductive path 212 and the second conductive path 213 are electrically connected to the first flexible extension board 26, and the first conductive component 22 is electrically connected to the second flexible extension board 27.

[0067] Optionally, the first flexible extension board 26 is connected to one end of the flexible board part of the circuit board 21, and the second flexible extension board 27 is connected to the other end of the flexible board part of the circuit board 21. The connection method can be laser welding, hot pressing welding, clamping, etc., without specific limitation.

[0068] Optionally, the first flexible extension plate 26 and the second flexible extension plate 27 may be an integrated structure or a split structure, and there is no specific limitation thereto.

[0069] Optionally, the first output terminal 261 is provided on the first flexible extension board 26, one end of the first conductive path 212 is connected to the first electrode 12, and the other end is directly or indirectly electrically connected to the positive electrode of the first output terminal 261, and there is no specific limitation. For example, the first conductive path 212 can extend to the first flexible extension board 26 and be directly electrically connected to the positive electrode of the first output terminal 261, the first conductive path 212 is electrically connected to the wiring on the first flexible extension board 26, and the wiring on the first flexible extension board 26 is electrically connected to the positive electrode of the first output terminal 261, thereby realizing the electrical connection between the first electrode 12 and the positive electrode of the first output terminal 261.

[0070] Optionally, a second output terminal 271 is provided on the second flexible extension plate 27, and the first conductive component 22 is directly or indirectly connected to the positive or negative electrode of the second output terminal 271, referring to the connection method between the first conductive path 212 and the first output terminal 261, which will not be repeated.

[0071] Optionally, the circuit board 21 further includes a third conductive path 216 , which is disposed on the board body 211 and is insulated from the first conductive path 212 and the second conductive path 213 . The third conductive path 216 is electrically connected to the negative electrode of the second output terminal 271 .

[0072] Optionally, the first conductive component 22 is electrically connected to the positive electrode of the second output terminal 271, the second conductive path 213 is electrically connected to the negative electrode of the first output terminal 261, and the third conductive path 216 is electrically connected to the negative electrode of the second output terminal 271. The connection method between the first conductive path 212 and the first flexible extension plate 26 is similar to that described above, and reference can be made thereto without further elaboration.

[0073] By setting the third conductive path 216 of the circuit board 21 to be set on the board body 211 and electrically connected to the negative electrode of the second output terminal 271, an electrical connection is formed between the positive electrode of the second output terminal 271, the first conductive component 22, the third conductive path 216 and the negative electrode of the second output terminal 271, so that the overall internal resistance of the battery device 100 can be reduced and the power of the battery device 100 can be improved.

[0074] Optionally, the first conductive path 212 , the second conductive path 213 and the positive and negative electrodes of the first output terminal 261 form a first electrical connection. The first conductive member 22 , the third conductive path 216 and the positive and negative electrodes of the second output terminal 271 form a second electrical connection.

[0075] Optionally, the circuit where the first conductive component 22 is located can be arranged in parallel with the overall circuit of the first conductive path 212. For example, the first conductive component 22 connects the rivet of the battery cell 10 and the positive pole of the second output end 271 of the second flexible extension plate 27. The circuit where the first conductive component 22 is located can also be arranged in parallel with part of the circuit of the first conductive path 212. The first conductive component 22 can be added to any circuit that needs to be shunted and the internal resistance reduced, without specific limitation.

[0076] By setting the battery protection board 20 to also include a first flexible extension board 26 and a second flexible extension board 27, the first flexible extension board 26 and the second flexible extension board 27 are respectively connected to the circuit board 21, and the first conductive path 212 and the second conductive path 213 are electrically connected to the first flexible extension board 26, and the first conductive component 22 is electrically connected to the second flexible extension board 27, so as to realize the electrical connection between the battery cell 10 and the battery protection board 20 and the outside world.

[0077] Optionally, the battery protection board 20 further includes a second conductive component (not shown in the figure), the second conductive component is mounted on the board body 211 , and the circuit where the second conductive component is located is connected in parallel with the second conductive path 213 .

[0078] Optionally, the material of the second conductive component and the connection method between the second conductive component and the plate body 211 are similar to those of the first conductive component 22 , and are illustrative only and will not be described in detail.

[0079] Optionally, the second conductive component can be arranged in parallel with the entire second conductive path 213. For example, the second conductive component connects the cover plate of the battery cell 10 and the negative pole of the second output end 271 of the second flexible extension plate 27. The second conductive component can also be arranged in parallel with part of the line of the second conductive path 213. The second conductive component can be added to any line that needs to be shunted and the internal resistance reduced, without specific limitation.

[0080] By configuring the battery protection board 20 to also include a second conductive component, the second conductive component is mounted on the board body 211, and the circuit where the second conductive component is located and the second conductive path 213, the overall internal resistance of the battery device 100 can be reduced, the power of the battery device 100 can be increased, and the temperature rise during the charging and discharging process can be greatly reduced.

[0081] With the rapid development of mobile phone fast charging technology, high-power charging has higher and higher requirements for batteries. When charging and discharging at high currents, the temperature rise requirements of the battery are also relatively high, which requires the current resistance value of the circuit to be larger and larger. Ways to improve the current resistance value of the circuit include: increasing the thickness of the copper foil of the circuit and increasing the line width. When the width and thickness of the battery protection board 20 are limited and still cannot meet the design requirements, consider adding a parallel circuit of a high current line on the basis of the internal circuit of the battery protection board 20 to improve the current resistance value of the circuit.

[0082] In the prior art, the added parallel circuit is an additional conductive component, which needs to be welded to the battery cell 10 tabs and the protection board respectively, which is complicated and costly. In addition, due to the different welding positions and welding requirements, it is difficult to realize production automation in actual applications, which is not conducive to mass production of products.

[0083] The battery protection board 20 in the embodiment of the utility model is provided with a circuit board 21 and a first conductive component 22. The first conductive path 212 and the second conductive path 213 of the circuit board 21 are arranged at intervals on the board body 211 of the circuit board 21, and the first conductive path 212 and the second conductive path 213 are respectively connected to the electrodes of the battery cell 10 with opposite polarities, and the circuit where the first conductive component 22 is located is connected in parallel with the first conductive path 212. The first conductive component 22 and the circuit board 21 are mounted as a whole, and no additional assembly is required, which can reduce the process, reduce costs, and facilitate automated mass production.

[0084] Optional, such as Figure 3 and Figure 4 As shown, the board body 211 includes a first surface 214 and a second surface 215 opposite to each other, and the battery protection board 20 also includes a first solder pad 23, the first solder pad 23 is arranged on the first surface 214, the first conductive component 22 is mounted on the second surface 215, and the first conductive component 22 and the first conductive path 212 are both electrically connected to the first solder pad 23.

[0085] Optionally, the material of the first pad 23 may be a pad material commonly used in the art, such as nickel, copper-plated nickel, tin-copper alloy, gold-plated material, etc., without specific limitation.

[0086] Optionally, the first pad 23 and the board body 211 may be connected by mounting, welding, etc., without any specific limitation.

[0087] Optionally, the first pad 23 is mounted on the first surface 214 , and the first conductive component 22 is mounted on the second surface 215 via the first chip pad 221 and the second chip pad 222 .

[0088] Optionally, the battery device 100 further includes a first connecting sheet 30 , and the first electrode 12 of the battery cell 10 is connected to the first pad 23 via the first connecting sheet 30 , and the connection method may be welding, bonding, mounting, etc., which is not specifically limited.

[0089] Optionally, the first connecting sheet 30 is an L-shaped nickel sheet, one end of which is mounted on the first pad 23 by SMT technology, and the other end of which is welded to the first electrode 12 by wrapping spot welding.

[0090] By setting the board body 211 to include a first surface 214 and a second surface 215 opposite to each other, the battery protection board 20 also includes a first soldering pad 23, the first soldering pad 23 is arranged on the first surface 214, the conductive component is mounted on the second surface 215, the first conductive component 22 and the first conductive path 212 are both electrically connected to the first soldering pad 23, and the first conductive component 22 and the soldering pad are arranged on two opposite surfaces of the board body 211, which can avoid the short circuit between the soldering pads in the prior art caused by uncertain factors, thereby improving the safety of use.

[0091] Optionally, the battery protection board 20 further includes a second pad 24 , which is disposed on the first surface 214 and spaced apart from the first pad 23 , and the second pad 24 is electrically connected to the second conductive path 213 .

[0092] Optionally, the second pad 24 is also electrically connected to the third conductive path 216 .

[0093] Optionally, the material of the second pad 24 and the connection method between the second pad 24 and the board 211 are similar to those of the first pad 23 described above, and are only for reference and will not be described in detail.

[0094] For example, Figure 4 As shown, the first electrode 12 is a rivet, the second electrode 11 is a cover plate, the first welding pad 23 is electrically connected to the rivet through the first connecting piece 30, and the second welding pad 24 is electrically connected to the cover plate through the second connecting piece 40, so that after the positive and negative electrodes of the battery protection board 20 and the battery cell 10 are connected, when the battery is charged and discharged, current passes through the first conductive component 22 and the circuit board 21 to improve the current resistance value of the battery protection board 20.

[0095] Optionally, in another embodiment, as Figure 6 As shown, the battery cell 10 is a soft-pack battery cell 10 , the first pad 23 is electrically connected to the first electrode 12 through the first connecting sheet 30 , and the second pad 24 is electrically connected to the second electrode 11 through the second connecting sheet 40 .

[0096] By setting the battery protection board 20 to also include a second pad 24, the second pad 24 is set on the first surface 214 and is spaced apart from the first pad 23. The second pad 24 is electrically connected to the second conductive path 213, which can avoid short circuits between pads in the prior art due to uncertain factors and improve safety of use.

[0097] Optionally, the board body 211 is provided with a via hole (not shown in the figure) penetrating the first surface 214 and the second surface 215 , and the first conductive component 22 is electrically connected to the first pad 23 through the via hole.

[0098] Optionally, the shape of the via hole can be circular, square, triangular, etc., and the number of via holes can be one or more, and the appropriate number can be set according to the calculated current carrying value of the actual circuit, without specific restrictions. The via hole can realize the electrical connection between different layers of the circuit board 21, and enhance the performance and reliability of the circuit design.

[0099] The board body 211 is provided with a via hole penetrating the first surface 214 and the second surface 215 , and the via hole realizes electrical connection between the first surface 214 and the second surface 215 , thereby realizing electrical connection between the first conductive component 22 and the first pad 23 .

[0100] Optional, such as Figure 3 As shown, the battery protection board 20 further includes an electronic component 25 , which is mounted on the second surface 215 , and the electronic component 25 is spaced apart from the first conductive component 22 .

[0101] Optionally, the circuit board 21 is formed by bonding a printed circuit board 21 (PCB) and a flexible circuit board 21 (FPC) together through a board making process, and the circuit board 21 provides a patch environment for the electronic component 25 and line connections between circuits.

[0102] Optionally, the electronic components 25 mainly include: power management IC, protection IC1, protection IC2, MOS, precision detection resistor, NTC and auxiliary resistors and capacitors.

[0103] The power management IC is an integrated circuit chip used to manage and control various aspects of the power supply system. It can monitor, adjust and protect the power supply voltage, voltage and power to ensure the normal use of electronic equipment, and can also save power and extend the service life of the battery cell 10. The protection IC is also a control unit in the circuit. When abnormal charging and discharging occurs in the protection circuit, the protection IC controls the MOS tube to cut off the battery circuit to protect the battery cell 10 from safety risks. MOS (metal oxide semiconductor) is a switching unit that is closed and disconnected through the control of the IC to protect the safety of the circuit. Precision detection resistors can more accurately detect the current value in the circuit. NTC is attached to the first side 214 of the battery protection board 20 and is used to collect the real-time temperature of the battery cell 10. Auxiliary resistors and capacitors are used to protect and assist components to perform protection functions.

[0104] Optionally, the electronic component 25 is mounted on the second surface 215 of the board 211 by SMT technology, and the battery device 100 mainly implements the protection function and communication function during the circuit charging and discharging process by the electronic component 25 .

[0105] Optionally, the electronic component 25 may be arranged in series and / or in parallel with the first conductive path 212 , and may also be arranged in series and / or in parallel with the second conductive path 213 , without any specific limitation.

[0106] Optionally, when the internal design circuit of the circuit board 21 cannot meet the design power requirements of the battery pack, a conductive component can be connected in parallel at the location of the large current line to increase the power usage of the loop.

[0107] Optionally, the electronic component 25 and the first conductive component 22 are attached to the same surface of the board body 211. Compared with the prior art method in which the first conductive component 22 is additionally connected to the circuit board 21 using a connector, the thickness of the electronic component 25 can absorb the thickness of the first conductive component 22, thereby reducing the overall thickness of the battery protection board 20.

[0108] By configuring the battery protection board 20 to also include an electronic component 25 , the electronic component 25 is mounted on the second surface 215 , and the electronic component 25 is spaced apart from the first conductive member 22 , the overall thickness of the battery protection board 20 can be reduced, saving the internal space occupied by the battery protection board 20 in the battery device 100 .

[0109] Optionally, the first conductive member 22 is coated with a first insulating layer, and / or the circuit board 21 and the first conductive member 22 are coated with a second insulating layer.

[0110] Optionally, the first conductive component 22 is coated with a first insulating layer, which may be an insulating film or an insulating coating, or the first conductive component 22 may be coated with UV glue and conformal coating to perform insulation treatment.

[0111] Optionally, the circuit board 21 and the first conductive component 22 are covered with a second insulating layer, and the material of the second insulating layer can be a resin material, such as epoxy resin, polyimide, etc., or paper and its composite materials, ceramic materials, etc., without specific limitation.

[0112] Optionally, the circuit board 21 usually carries multiple circuits and components, and these circuits and components can be isolated by insulating materials to prevent short circuits, leakage and other problems between them. Therefore, the circuit board 21 and the first conductive component 22 can be covered with an insulating layer to be isolated from the outside world to ensure stable operation and safe use of the circuit. Optionally, the first conductive component 22 and the circuit board 21 are packaged into one by EMC material molding (SIP packaging). EMC (electromagnetic compatibility) materials refer to those materials that can suppress electromagnetic interference and reduce electromagnetic radiation. Molding packaging is a technology that encapsulates and protects exposed chips with epoxy resin molding compound.

[0113] By encapsulating the circuit board 21 and the first conductive member 22 with epoxy resin molding compound through a mold under pressure and temperature, the impact of electromagnetic interference on other devices and systems can be reduced, and the impact of electromagnetic radiation on the environment and human body can be reduced. It can also protect the device from external damage, while enhancing the physical properties of the device for easy use.

[0114] Optionally, the first conductive component 22 is coated with a first insulating layer, and the conventional circuit board 21 in the art will be insulated, so there is no risk of short circuit between the first conductive component 22 and the circuit board 21. Alternatively, the first conductive component 22 is not additionally insulated, but is insulated together with the circuit board 21 by a second insulating layer, which can save material costs and design costs, and there is no risk of short circuit. Alternatively, after the first conductive component 22 is coated with the first insulating layer, it is coated with the second insulating layer together with the circuit board 21. All of the above methods are possible and are not specifically limited.

[0115] By setting the circuit board 21 and the first conductive component 22 to be covered with a first insulating layer, and / or the circuit board 21 and the first conductive component 22 to be covered with a second insulating layer, problems such as short circuit and leakage between circuits can be prevented, thereby ensuring stable operation and safe use of the battery protection board 20.

[0116] Optional, such as Figure 1 As shown, after the battery protection board 20 is assembled, the first surface 214 of the board body 211 faces the battery cell 10 , and the second surface 215 faces away from the battery cell 10 .

[0117] Optionally, the first pad 23 and the second pad 24 are mounted on the first surface 214, and the first surface 214 faces the battery cell 10 to facilitate the connection of the first pad 23 and the second pad 24 with the electrodes of the battery cell 10 through the connecting sheet. The first conductive member 22 is mounted on the second surface 215 to avoid short circuits between the first conductive member 22 and the pads due to uncertain factors, thereby improving safety in use.

[0118] By setting the first surface 214 toward the battery cell 10 and the second surface 215 opposite to the battery cell 10, the first solder pad 23 and the second solder pad 24 are set on the first surface 214, and the conductive component is mounted on the second surface 215, the connection between the battery protection board 20 and the battery cell 10 is achieved to avoid the risk of cross-increase short circuit.

[0119] A battery device 100 in an embodiment of the present invention is introduced below.

[0120] The battery device 100 includes a battery cell 10 and a battery protection board 20 . The battery protection board 20 includes a circuit board 21 and a first conductive component 22 . The first conductive component 22 is used to shunt the first electrode 12 of the battery cell 10 and the positive electrode of the first output terminal 261 of the battery protection board 20 .

[0121] The battery cell 10 includes a battery cell 10 body, a rivet (positive polarity) and a cover plate (negative polarity), and the cover plate and the rivet are connected at one end of the battery cell 10 body in the length direction X. In this embodiment, the first conductive member 22 is made of copper, with a length of 30 mm to 40 mm, a width of 0.5 mm to 1.5 mm, and a thickness of 0.3 mm to 1.0 mm.

[0122] The surface of the first conductive component 22 in the embodiment of the utility model is not insulated. The first conductive component 22 is mounted on the circuit board 21 through the first patch pad 221 and the second patch pad 222, and the connection between the first conductive component 22 and the first patch pad 221 and the connection between the first conductive component 22 and the second patch pad 222 are tin-plated. The manufacturing process requires that the patch position of the first conductive component 22 is plated with matte tin on one side, and the coating thickness is 3um to 7um. After the electronic components 25 and the first conductive component 22 on the circuit board 21 are mounted on the first side 214 of the circuit board 21, the SIP process is used to package the battery protection board 20, which plays a role in protecting components, increasing the overall strength of the battery protection board 20, and avoiding stress concentration. Next, the battery device 100 is assembled.

[0123] When the battery device 100 is assembled, the battery protection board 20 is first in an unfolded state. The second surface 215 of the circuit board 21 opposite to the first surface 214 is connected with a first pad 23 and a second pad 24. The positive polarity rivet of the battery cell 10 is welded to the first pad 23 of the battery protection board 20 by laser spot welding, and the negative polarity cover plate is welded to the second pad 24 of the battery protection board 20 by laser spot welding. After the battery cell 10 and the battery protection board 20 are connected, the normal charging and discharging function of the battery device 100 can be realized.

[0124] Then, the battery protection board 20 is folded to the side of the cover plate away from the battery cell 10 in the length direction X of the battery cell 10, and the first surface 214 of the circuit board 21 faces the battery cell 10, so that the first pad 23 and the second pad 24 of the battery protection board 20 are respectively in contact with the rivet and the cover plate of the battery cell 10 with the same polarity, and the second surface 215 on which the electronic component 25 and the first conductive member 22 are mounted is opposite to the battery cell 10. At this point, the assembly of the battery cell 10 and the battery protection board 20 is completed.

[0125] When the battery device 100 in the embodiment of the utility model is discharged, there is a positive first electrical connection and a second electrical connection in parallel to shunt the current, which together realize the function of current diversion. The direction of the current of the positive first electrical connection is to flow out from the positive rivet of the battery cell 10, flow to the first pad 23 of the battery protection board 20 through the first connecting piece 30, and then flow to the positive pole of the first output terminal 261 of the battery protection board 20 through the first conductive path 212 of the battery protection board 20, and finally flow in from the negative cover plate. The direction of the current of the second electrical connection is to flow out from the positive rivet of the battery cell 10, flow to the first pad 23 of the battery protection board 20 through the first connecting piece 30, and then flow into the first patch pad 221 of the first conductive member 22 through the via hole of the circuit board 21. The current flows to the positive pole of the second output terminal 271 of the battery protection board 20 through the first conductive member 22, and finally the current flows in from the negative cover plate of the battery cell 10 to realize the discharge function of the battery cell 10. The current flow direction in the battery device 100 during charging is opposite, which can be referred to and will not be repeated.

[0126] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0127] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A battery protection board, characterized in that: include: A circuit board, comprising a board body, a first conductive path and a second conductive path, wherein the first conductive path and the second conductive path are both arranged on the board body and insulated from each other, the first conductive path is suitable for being electrically connected to a first electrode of a battery cell, the second conductive path is suitable for being electrically connected to a second electrode of the battery cell, and the first electrode and the second electrode have opposite polarities; The first conductive component is mounted on the board and connected in parallel with at least a portion of the first conductive path.

2. The battery protection board according to claim 1, characterized in that: The board body includes a first surface and a second surface opposite to each other. The battery protection board also includes a first pad, the first pad is arranged on the first surface, the first conductive component is mounted on the second surface, and the first conductive component and the first conductive path are both electrically connected to the first pad.

3. The battery protection board according to claim 2, characterized in that: The board body is provided with a via hole penetrating the first surface and the second surface, and the first conductive component is electrically connected to the first pad through the via hole.

4. The battery protection board according to claim 2, characterized in that: The battery protection board further includes an electronic component mounted on the second surface, and the electronic component is spaced apart from the first conductive component.

5. The battery protection board according to claim 2, characterized in that: The battery protection board also includes a second pad, which is disposed on the first surface and spaced apart from the first pad, and the second pad is electrically connected to the second conductive path.

6. The battery protection board according to any one of claims 1 to 5, characterized in that: The first conductive member is coated with a first insulating layer, and / or the circuit board and the first conductive member are coated with a second insulating layer.

7. The battery protection board according to claim 1, characterized in that: The battery protection board also includes a second conductive component, which is mounted on the board body and connected in parallel with at least a portion of the second conductive path.

8. The battery protection board according to claim 1, characterized in that: The battery protection board also includes a first flexible extension board and a second flexible extension board, the first flexible extension board and the second flexible extension board are respectively connected to the circuit board, and the first conductive path and the second conductive path are electrically connected to the first flexible extension board, and the first conductive member is electrically connected to the second flexible extension board.

9. The battery protection board according to claim 8, characterized in that: The circuit board further includes a third conductive path, which is disposed on the board body and is insulated from the first conductive path and the second conductive path, and is electrically connected to the second flexible extension board.

10. A battery device, characterized in that: The invention comprises a battery cell and a battery protection plate as claimed in any one of claims 1 to 9, wherein the battery cell is connected to the first electrode and the second electrode, the first conductive path is electrically connected to the first electrode, and the second conductive path is electrically connected to the second electrode.

11. An electrical device, characterized in that: It comprises an electric device and the battery device as claimed in claim 10, wherein the battery device supplies power to the electric device.

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