Battery protection board, battery apparatus, and electrical device

Abstract

A battery protection board, a battery apparatus, and an electrical device. 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 both arranged on the board body and are insulated from each other; the first conductive path is adapted to be electrically connected to a first electrode of a battery cell; the second conductive path is adapted to be electrically connected to a second electrode of the battery cell; the first electrode and the second electrode have opposite polarities; the first conductive member is attached to the board body and is connected in parallel with at least part of the first conductive path.

Description

Battery protection board, battery device and electrical equipment

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 20, 2024, with application number 202420574374.3 and invention name “Battery protection board, battery device and electrical equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery protection board, a battery device and an electrical device. Background Art

[0003] With the rapid development of mobile phone fast charging technology, high-power charging has increasingly higher requirements for batteries. During high-current charging and discharging, the battery temperature rise requirements are also relatively high, which poses a huge challenge to the design of battery protection boards and structural parts.

[0004] Existing battery protection boards add additional conductive components outside the circuit board to reduce the internal resistance of the battery. The conductive components need to be additionally welded to the battery cells and the protection board, which is a complex process and high cost.

[0005] Summary of the Invention

[0006] The purpose of this application is to provide a battery protection board, a battery device and an electrical equipment that can reduce the number of processes and reduce costs.

[0007] To achieve the purpose of this application, this application provides the following technical solutions:

[0008] In a first aspect, the present application provides a battery protection board, comprising 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 disposed on the board body and insulated from each other, the first conductive path being adapted to be electrically connected to a first electrode of a battery cell, the second conductive path being adapted to be electrically connected to a second electrode of the battery cell, and the first electrode and the second electrode having opposite polarities;

[0009] The first conductive component is mounted on the board and connected in parallel with at least a portion of the first conductive path.

[0010] In one embodiment, the board body includes a first surface and a second surface opposite to each other, and the battery protection board also includes a first solder pad, the first solder 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 solder pad.

[0011] 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.

[0012] In one embodiment, the battery protection board further includes an electronic component, which is mounted on the second surface and spaced apart from the first conductive component.

[0013] In one embodiment, the battery protection board further 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.

[0014] In one embodiment, the first conductive member is covered with a first insulating layer, and / or the circuit board and the first conductive member are covered with a second insulating layer.

[0015] 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.

[0016] In one embodiment, the battery protection board further 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.

[0017] In one embodiment, the circuit board further includes a third conductive path, which is provided on the board body and insulated from the first conductive path and the second conductive path, and is electrically connected to the second flexible extension plate.

[0018] In one embodiment, the circuit where the first conductive member is located is arranged in parallel with the entire circuit of the first conductive path, or the circuit where the first conductive member is located is arranged in parallel with a partial circuit of the first conductive path.

[0019] In one embodiment, the first flexible extension plate is connected to one end of the flexible plate portion of the circuit board, and the second flexible extension plate is connected to the other end of the flexible plate portion of the circuit board which is opposite to the other end.

[0020] In one embodiment, a first output end is provided on the first flexible extension board, the first conductive path is electrically connected to the positive pole of the first output end, a second output end is provided on the second flexible extension board, and the first conductive member is connected to the positive pole or negative pole of the second output end.

[0021] In one embodiment, when the battery protection board is assembled, the first surface faces the battery cell, and the second surface faces away from the battery cell.

[0022] In a second aspect, the present application also 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 a first electrode and a second electrode, a first conductive path in the battery protection plate is electrically connected to the first electrode, and a second conductive path in the battery protection plate is electrically connected to the second electrode.

[0023] In a third aspect, the present application 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 is used to supply power to the electrical device.

[0024] By providing a circuit board and a first conductive component, the first conductive path and the second conductive path of the circuit board are provided 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 first conductive component 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 an integral whole without the need for additional assembly, which can reduce the number of processes, reduce costs, and facilitate automated mass production.

[0025] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the implementation methods of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the implementation methods or the description of the prior art. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] FIG1 is a front view of a battery device according to an embodiment of the present application;

[0028] FIG2 is a front view of a battery cell according to an embodiment of the present application;

[0029] FIG3 is a front view of a battery device with a battery protection plate in an unfolded state according to an embodiment of the present application;

[0030] FIG4 is a rear view of a battery device with a battery protection plate deployed according to an embodiment of the present application;

[0031] FIG5 is a schematic diagram of a battery device according to an embodiment of the present application;

[0032] FIG6 is a rear view of a battery device with a battery protection plate deployed according to another embodiment of the present application;

[0033] FIG7 is a block diagram of a battery device according to an embodiment of the present application;

[0034] FIG8 is a block diagram of an electric device according to an embodiment of the present application.

[0035] Explanation of the accompanying drawings: 100-battery device; 10-battery cell, 11-second electrode, 12-first electrode; 20-battery protection board, 21-circuit board, 211-board body, 212-first conductive path, 213-second conductive path, 214-first side, 215-second side, 216-third conductive path, 22-first conductive member, 221-first chip pad, 222-second chip 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; 200-electrical equipment, 300-electrical device; 30-first connecting piece; 40-second connecting piece. Specific embodiments

[0036] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0037] 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 an intermediate component. When a component is referred to as being "connected to" another component, it may be directly connected to the other component or there may be an intermediate component.

[0038] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used in this application includes any and all combinations of one or more of the relevant listed items.

[0039] The following describes some embodiments of the present application in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0040] An embodiment of the present application provides an electric device, including an electric device and a battery device in an embodiment of the present application, wherein the battery device is used to supply power to the electric device.

[0041] Optionally, the power-consuming device may be a mobile phone, an electric vehicle, a hybrid vehicle, a base station, a household power load, etc.

[0042] Optionally, the battery device may be a power battery device, an energy storage battery device, etc., and the embodiments of the present application do not impose specific limitations on this.

[0043] The electrical equipment adopts the battery device in the embodiment of the present application, which can reduce the number of processes and lower the cost.

[0044] Please refer to FIG. 1 , an embodiment of the present application further provides a battery device 100 , including a battery cell 10 and a battery protection board 20 in an embodiment of the present application.

[0045] For ease of understanding, let's first define directions, as shown in FIG1 . X is the length direction of the battery cell 10 .

[0046] Optionally, the battery cell 10 may be a soft-pack battery cell, a steel-shell battery cell, etc., and the embodiment of the present application does not limit this.

[0047] Optionally, as shown in FIG1 , the battery cell 10 in FIG1 may be a steel shell battery cell. 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 polarities of the first electrode 12 and the second electrode 11 are opposite.

[0048] 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, as shown in Figure 2, one end of the length direction X of the battery cell 10 includes a cover and a rivet, the first electrode 12 of the battery cell 10 is a rivet with a positive polarity, and the second electrode 11 of the battery cell 10 is a cover with a negative polarity. All of the above methods are acceptable and are not specifically limited.

[0049] Alternatively, in another embodiment, as shown in FIG6 , the battery cell 10 is a soft-pack battery cell. A first electrode 12 and a second electrode 11 are connected to one end of the battery cell 10 in the longitudinal direction X. The first electrode 12 has a positive polarity, and the second electrode 11 has a negative polarity.

[0050] 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.

[0051] Optionally, the number of battery cells 10 can be one or more, and the embodiments of the present application do not limit this. In the case of 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. For example, the battery protection board 20 can be applied to different series-parallel structures such as two batteries connected in series to form a battery pack (2S1P), three batteries connected in series to form a battery pack (3S1P), four batteries connected in series to form a battery pack (4S1P), four batteries connected in series in pairs and then in parallel to form a battery pack (2S2P), three battery cells connected in series and then two groups connected in parallel to form a battery pack (3S2P), etc., where m in mSnP represents the number of batteries connected in series, and n represents the number of batteries connected in parallel.

[0052] Optionally, the battery device 100 further includes a housing, which includes a bottom plate and a plurality of side plates connected to the bottom plate to 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.

[0053] In some embodiments of the present application, the shell is a material with high structural strength, specifically metal materials, high-strength plastics, ceramics, etc., wherein the metal material can be aluminum, aluminum alloy, magnesium alloy, iron and iron alloy, 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 specifically be a process such as stamping, casting, etc., which is not limited in the embodiments of the present application. Alternatively, the shell can also be a split structure, that is, 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.

[0054] Optionally, the battery device 100 further includes a top plate, which is connected to the opening of the outer shell to seal the housing cavity. The connection between the top plate and the outer shell can be welding, bonding, clamping, screwing, etc., which is not limited in this embodiment of the present application. The shape of the top plate can be substantially the same as that of the bottom plate.

[0055] The battery device 100 in the embodiment of the present application can reduce the number of steps and lower the cost by adopting the battery protection plate 20 in the embodiment of the present application.

[0056] The battery protection board 20 in the embodiment of the present application is introduced in detail below.

[0057] 3 and 5 , an embodiment of the present application provides a battery protection board 20 , including a circuit board 21 and a first conductive component 22 .

[0058] 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.

[0059] Optionally, the circuit board 21 can be a circuit board commonly used in the field, such as a flexible circuit board, a rigid circuit board, a rigid-flexible integrated circuit board, a rigid-flexible combined circuit board, a printed circuit board (PCB), a ceramic circuit board, etc., and the embodiment of the present application does not limit this.

[0060] Optionally, the board body 211 of the circuit board 21 includes a printed circuit board portion and a flexible circuit board portion, and the printed circuit board portion and the flexible circuit board portion are formed into the board body 211 through a board making process.

[0061] Optionally, the shape of the plate 211 can be rectangular, square, circular, irregular polygonal, etc., and this embodiment of the present application does not impose any specific limitation on this.

[0062] Optionally, the first conductive path 212 and the second conductive path 213 are internal routing of the circuit board 21. The first conductive path 212 and the second conductive path 213 are arranged inside the board body 211. The routing can be arranged manually or by an automatic routing tool. This embodiment of the application does not impose any specific restrictions on this.

[0063] Optionally, one of the first conductive path 212 and the second conductive path 213 is connected to the cover of the battery cell 10 , and the other is connected to the rivet of the battery cell 10 .

[0064] 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 .

[0065] Optionally, the first conductive component 22 is a block-shaped rectangular parallelepiped conductive component. The material of the first conductive component 22 can be copper, aluminum, silver, steel, etc., and this embodiment of the application does not impose any specific limitation on this.

[0066] Optionally, the first conductive member 22 is mounted to the board 211 using surface mount technology (SMT). SMT technology allows components to be mounted directly on the surface of the circuit board 21, rather than inserting components into slots on the circuit board 21 as in traditional PCBs. SMT technology has advantages such as high assembly density, high reliability, strong vibration resistance, and ease of automation.

[0067] 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.

[0068] 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 is tin-plated to facilitate the first conductive member 22 to meet SMT patch requirements. If the first conductive member 22 is made of other conductive materials, it must also meet SMT patch requirements. The tin-plated area on the first conductive member 22 must meet the SMT patch requirements while also meeting the soldering tensile strength requirements to prevent the patch from falling off after placement.

[0069] 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 to 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.

[0070] 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 member 22 is electrically connected to the second flexible extension board 27.

[0071] Optionally, the first flexible extension plate 26 is connected to one end of the flexible plate portion of the circuit board 21, and the second flexible extension plate 27 is connected to the other end of the flexible plate portion of the circuit board 21. The connection method can be laser welding, hot pressing welding, clamping, etc., and the embodiment of the present application does not impose specific restrictions on this.

[0072] Optionally, the first flexible extension plate 26 and the second flexible extension plate 27 may be an integrated structure or a split structure, and this embodiment of the present application does not impose any specific limitation on this.

[0073] Optionally, a first output terminal 261 is provided on the first flexible extension plate 26, and 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, without limitation. For example, the first conductive path 212 may extend to the first flexible extension plate 26 and be directly electrically connected to the positive electrode of the first output terminal 261. The first conductive path 212 may be electrically connected to a trace on the first flexible extension plate 26, and the trace on the first flexible extension plate 26 may be electrically connected to the positive electrode of the first output terminal 261, thereby achieving electrical connection between the first electrode 12 and the positive electrode of the first output terminal 261.

[0074] 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 pole of the second output terminal 271. The connection method between the first conductive path 212 and the first output terminal 261 mentioned above can be referred to and will not be repeated.

[0075] 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 .

[0076] Optionally, the first conductive component 22 is electrically connected to the positive pole of the second output terminal 271, the second conductive path 213 is electrically connected to the negative pole of the first output terminal 261, and the third conductive path 216 is electrically connected to the negative pole 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 the connection method between the first conductive path 212 and the first flexible extension plate 26. Please refer to it and do not repeat it here.

[0077] By disposing the third conductive path 216 of the circuit board 21 on the board body 211 and electrically connecting it 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 member 22, the third conductive path 216, and the negative electrode of the second output terminal 271. This can reduce the overall internal resistance of the battery device 100 and increase the power of the battery device 100.

[0078] Optionally, a first electrical connection is formed between the first conductive path 212 , the second conductive path 213 and the positive and negative electrodes of the first output terminal 261 , and a second electrical connection is formed between the first conductive member 22 , the third conductive path 216 and the positive and negative electrodes of the second output terminal 271 .

[0079] 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. The embodiment of the present application does not impose specific restrictions on this.

[0080] 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 member 22 is electrically connected to the second flexible extension board 27, thereby realizing electrical connection between the battery cell 10 and the battery protection board 20 and the outside world.

[0081] Optionally, the battery protection board 20 further includes a second conductive component (not shown in the figure), which is mounted on the board body 211 , and a circuit where the second conductive component is located is connected in parallel with the second conductive path 213 .

[0082] 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 described above, and are only for reference and will not be described in detail.

[0083] 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 circuit that needs to be shunted and the internal resistance reduced. The embodiment of the present application does not impose specific restrictions on this.

[0084] By configuring the battery protection board 20 to also include a second conductive component, the second conductive component is attached to the board body 211, and the circuit where the second conductive component is located and the second conductive path 213 are connected, 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.

[0085] With the rapid development of mobile phone fast-charging technology, high-power charging places increasingly stringent demands on batteries. During high-current charging and discharging, the battery's temperature rise requirements are also relatively high, which requires the circuit's current resistance to be increasingly higher. Ways to improve the circuit's current resistance include increasing the circuit's copper foil thickness and line width. If the width and thickness of the battery protection board 20 are pushed to their limits and still do not meet the design requirements, consider adding a parallel circuit of high-current lines to the internal circuits of the battery protection board 20 to increase the circuit's current resistance.

[0086] In the prior art, the added parallel circuit is an additional conductive component that needs to be welded to the tabs and protective plates of the battery cell 10 separately, which is a complex process and high cost. Furthermore, due to the different welding positions and welding requirements, it is difficult to achieve production automation in real applications, which is not conducive to mass production of products.

[0087] The battery protection board 20 in the embodiment of the present application 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 provided 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 one body, and no additional assembly is required, which can reduce the process, reduce costs, and facilitate automated mass production.

[0088] Optionally, as shown in Figures 3 and 4, 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, and 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.

[0089] Optionally, the material of the first pad 23 can be a pad material commonly used in the art, such as nickel, copper-plated nickel, tin-copper alloy, gold-plated material, etc., and the embodiment of the present application does not impose specific restrictions on this.

[0090] Optionally, the first pad 23 and the board body 211 may be connected by mounting, welding, or the like, and this embodiment of the present application does not impose any specific limitation thereto.

[0091] 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 patch pad 221 and the second patch pad 222 .

[0092] Optionally, the battery device 100 further includes a first connecting piece 30 , and the first electrode 12 of the battery cell 10 is connected to the first pad 23 via the first connecting piece 30 . The connection method may be welding, bonding, mounting, etc., and the embodiment of the present application does not impose any specific restrictions on this.

[0093] Optionally, the first connecting piece 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 is welded to the first electrode 12 by wrapping spot welding.

[0094] 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, and the first conductive component 22 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. The first conductive component 22 and the soldering pad are arranged on two opposite sides of the board body 211, which can avoid the short circuit between the soldering pads caused by uncertain factors in the prior art, thereby improving the safety of use.

[0095] 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 . The second pad 24 is electrically connected to the second conductive path 213 .

[0096] Optionally, the second pad 24 is also electrically connected to the third conductive path 216 .

[0097] 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.

[0098] Exemplarily, as shown in Figure 4, 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 poles 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.

[0099] Optionally, in another embodiment, as shown in FIG6 , the battery cell 10 is a soft-pack battery cell, the first solder pad 23 is electrically connected to the first electrode 12 through the first connecting piece 30 , and the second solder pad 24 is electrically connected to the second electrode 11 through the second connecting piece 40 .

[0100] By setting the battery protection board 20 to also include a second solder pad 24, the second solder pad 24 is arranged on the first surface 214 and is spaced apart from the first solder pad 23. The second solder pad 24 is electrically connected to the second conductive path 213, which can avoid the short circuit between the solder pads in the prior art due to uncertain factors and improve the safety of use.

[0101] 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 member 22 is electrically connected to the first pad 23 through the via hole.

[0102] Optionally, the shape of the via can be circular, square, triangular, etc., and the number of vias can be one or more. The appropriate number can be set based on the calculated current carrying capacity of the actual circuit, and this embodiment of the application does not impose specific restrictions on this. Vias can achieve electrical connections between different layers of the circuit board 21, enhancing the performance and reliability of the circuit design.

[0103] The board body 211 is provided with a via hole penetrating the first surface 214 and the second surface 215 . 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 .

[0104] Optionally, as shown in FIG. 3 , the battery protection board 20 further includes 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 component 22 .

[0105] Optionally, the circuit board 21 is formed by laminating a printed circuit board 21 (PCB) and a flexible printed circuit 21 (FPC) together through a board making process. The circuit board 21 provides a patch environment for the electronic components 25 and line connections between circuits.

[0106] Optionally, the electronic components 25 mainly include: power management (Integrated Circuit, IC), protection IC1, protection IC2, Metal-Oxide-Semiconductor Field-Effect Transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET), precision detection resistor, negative temperature coefficient (Negative Temperature Coefficient, NTC) element and auxiliary resistors and capacitors, etc.

[0107] 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 the control unit in the circuit. When abnormal charging and discharging occurs in the protection circuit, the protection IC controls the action of the MOS tube and cuts off the battery circuit to protect the battery cell 10 from safety risks. MOS is a switching unit that is controlled by the IC to make closed and open states to protect the safety of the circuit. Precision detection resistors can more accurately detect the current value in the circuit. The 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.

[0108] Optionally, the electronic components 25 are mounted on the second surface 215 of the board 211 by SMT technology. The battery device 100 mainly realizes the protection function and communication function during the circuit charging and discharging process through the electronic components 25 .

[0109] Optionally, the electronic component 25 may be arranged in series and / or in parallel with the first conductive path 212 , or in series and / or in parallel with the second conductive path 213 , without limitation.

[0110] 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 position of the high current line to increase the power usage of the circuit.

[0111] Optionally, the electronic component 25 and the first conductive component 22 are attached to the same surface of the board 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.

[0112] By setting 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.

[0113] Optionally, the first conductive member 22 is covered with a first insulating layer, and / or the circuit board 21 and the first conductive member 22 are covered with a second insulating layer.

[0114] Optionally, the first conductive member 22 is coated with a first insulating layer. The first insulating layer may be an insulating film or an insulating coating, or the first conductive member 22 may be coated with UV glue and conformal paint for insulation.

[0115] Optionally, the circuit board 21 and the first conductive component 22 are covered with a second insulating layer. 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. The embodiment of the present application does not impose specific restrictions on this.

[0116] Optionally, the circuit board 21 usually carries multiple circuits and components, and these circuits and components can be isolated by insulating materials to prevent problems such as short circuits and leakage between them. Therefore, the circuit board 21 and the first conductive component 22 can be covered with an insulating layer to isolate them from the outside world, ensuring stable operation and safe use of the circuit. Optionally, the first conductive component 22 and the circuit board 21 are packaged into one by molding electromagnetic compatibility (EMC) materials. EMC materials refer to materials that can suppress electromagnetic interference and reduce electromagnetic radiation. Molding is a technology that encapsulates and protects exposed chips with epoxy resin molding compound.

[0117] By encapsulating the circuit board 21 and first conductive member 22 with epoxy resin under pressure and temperature in a mold, the circuit board 21 and first conductive member 22 are protected. This reduces the impact of electromagnetic interference on other devices and systems, and reduces the impact of electromagnetic radiation on the environment and human body. It also protects the device from external damage, while enhancing its physical properties and facilitating its use.

[0118] Optionally, the first conductive member 22 is coated with a first insulating layer. Conventional circuit boards 21 in the art are insulated, thus eliminating the risk of short circuits between the first conductive member 22 and the circuit board 21. Alternatively, the first conductive member 22 is not subjected to additional insulation treatment, but is instead insulated together with the circuit board 21 by coating it with a second insulating layer. This can avoid the risk of short circuits while saving material and design costs. Alternatively, the first conductive member 22 can be coated with the first insulating layer and then coated with the second insulating layer together with the circuit board 21. All of the above methods are possible and are not specifically limited in the present embodiments.

[0119] By arranging the first conductive component 22 of the circuit board 21 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.

[0120] Optionally, as shown in FIG. 1 , 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 .

[0121] Optionally, the first solder pad 23 and the second solder pad 24 are mounted on the first surface 214, with the first surface 214 facing the battery cell 10, to facilitate connection of the first solder pad 23 and the second solder pad 24 to the electrodes of the battery cell 10 via the connecting piece. The first conductive member 22 is mounted on the second surface 215 to prevent short circuits between the first conductive member 22 and the solder pads due to uncertain factors, thereby improving safety.

[0122] 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, avoiding the risk of cross-increase short circuit.

[0123] A battery device 100 according to an embodiment of the present application is introduced below.

[0124] 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 .

[0125] The battery cell 10 includes a battery cell body 10, a rivet (positive polarity), and a cover plate (negative polarity). The cover plate and the rivet are connected to one end of the battery cell body 10 in the longitudinal direction X. In this embodiment, the first conductive member 22 is made of copper and has dimensions of 30 mm to 40 mm in length, 0.5 mm to 1.5 mm in width, and 0.3 mm to 1.0 mm in thickness.

[0126] The surface of the first conductive component 22 in the embodiment of the present application 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 be matte tin-plated on one side, with a plating thickness of 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 battery protection board 20 is packaged using a system-level packaging (SIP) process to protect the components, increase the overall strength of the battery protection board 20, and avoid stress concentration. Next, the assembly process of the battery device 100 is described.

[0127] When assembling the battery assembly 100, the battery protection plate 20 is initially unfolded. A first solder pad 23 and a second solder pad 24 are connected to the second surface 215 of the circuit board 21, opposite the first surface 214. The positive polarity rivet of the battery cell 10 is laser spot welded to the first solder pad 23 of the battery protection plate 20, while the negative polarity cover plate is laser spot welded to the second solder pad 24 of the battery protection plate 20. Once the battery cell 10 and battery protection plate 20 are connected, the battery assembly 100 can function normally.

[0128] The battery protection board 20 is then folded over to the side of the cover plate away from the battery cell 10 in the longitudinal direction X of the battery cell 10, with the first side 214 of the circuit board 21 facing the battery cell 10. This allows the first soldering pads 23 and second soldering pads 24 of the battery protection board 20 to contact the battery cell 10 rivets and cover plate of the same polarity, respectively. The second side 215, on which the electronic component 25 and the first conductive member 22 are mounted, faces away from the battery cell 10. This completes the assembly of the battery cell 10 and the battery protection board 20.

[0129] When the battery device 100 in the embodiment of the present application is discharged, there is a positive first electrical connection and a second electrical connection in parallel to shunt current, which together achieve the function of current diversion. The direction of the current of the positive first electrical connection is to flow out from the positive electrode rivet of the battery cell 10, flow through the first connecting piece 30 to the first welding pad 23 of the battery protection board 20, then flow through the first conductive path 212 of the battery protection board 20 to the positive electrode of the first output terminal 261 of the battery protection board 20, and finally flow into the negative electrode cover. The direction of the current of the second electrical connection is to flow out from the positive electrode rivet of the battery cell 10, flow through the first connecting piece 30 to the first welding pad 23 of the battery protection board 20, then flow through the via of the circuit board 21 to the first patch pad 221 of the first conductive member 22, and the current flows through the first conductive member 22 to the positive electrode of the second output terminal 271 of the battery protection board 20. Finally, the current flows from the negative electrode cover of the battery cell 10, realizing the discharge function of the battery cell 10. When charging, the current in the battery device 100 flows in the opposite direction, which can be used for reference only and will not be repeated.

[0130] FIG7 is a block diagram of a battery device according to an embodiment of the present application. As shown in FIG7 , the battery device 100 includes a battery cell 10 and the aforementioned battery protection board 20. The battery cell 10 is connected to a first electrode 12 and a second electrode 11. A first conductive path 212 in the battery protection board 20 is electrically connected to the first electrode 12, and a second conductive path 213 in the battery protection board 20 is electrically connected to the second electrode 11. Furthermore, FIG8 is a block diagram of an electrical device according to an embodiment of the present application. As shown in FIG8 , the electrical device 200 includes an electrical device 300 and the aforementioned battery device 100. The battery device 100 is used to power the electrical device 300.

[0131] In the description of the embodiments of the present application, 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. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present application.

[0132] The above disclosure is only a preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present application are still within the scope covered by the present application.

[0133] References in this application to "one embodiment," "an embodiment," or "one or more embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of this application. Furthermore, please note that instances of the phrase "in one embodiment" do not necessarily all refer to the same embodiment.

[0134] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present application can be practiced without these specific details. In some instances, well-known methods, structures, and techniques are not shown in detail so as not to obscure the understanding of this description. In the claims, any reference symbols between brackets should not be constructed as limitations to the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of multiple such elements. The use of the words first, second, and third, etc. does not indicate any order. These words can be interpreted as names.

[0135] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery protection board (20), wherein: include: A circuit board (21) comprises a board body (211), a first conductive path (212), and a second conductive path (213), wherein the first conductive path (212) and the second conductive path (213) are both arranged on the board body (211) and insulated from each other, the first conductive path (212) is suitable for being electrically connected to a first electrode (12) of a battery cell (10), and the second conductive path (213) is suitable for being electrically connected to a second electrode (11) of the battery cell (10), and the polarities of the first electrode (12) and the second electrode (11) are opposite; A first conductive component (22) is mounted on the plate (211) and is connected in parallel with at least a portion of the first conductive path (212).

2. The battery protection board (20) according to claim 1, wherein: The board body (211) includes a first surface (214) and a second surface (215) facing each other. The battery protection board (20) also includes a first pad (23). The first pad (23) is arranged on the first surface (214). The first conductive component (22) 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 pad (23).

3. The battery protection board (20) according to claim 2, wherein: The plate body (211) is provided with a via hole penetrating the first surface (214) and the second surface (215); the first conductive component (22) is electrically connected to the first pad (23) through the via hole.

4. The battery protection board (20) according to claim 2, wherein: The battery protection board (20) further includes an electronic component (25), the electronic component (25) being mounted on the second surface (215), and the electronic component (25) being spaced apart from the first conductive component (22).

5. The battery protection board (20) according to claim 2, wherein: The battery protection plate (20) further includes a second pad (24), the second pad (24) being arranged on the first surface (214) and spaced apart from the first pad (23), and the second pad (24) being electrically connected to the second conductive path (213).

6. The battery protection board (20) according to any one of claims 1 to 5, wherein: The first conductive member (22) is covered with a first insulating layer, and / or the circuit board (21) and the first conductive member (22) are covered with a second insulating layer.

7. The battery protection board (20) according to claim 1, wherein: The battery protection board (20) further includes a second conductive component, which is mounted on the board body (211) and is connected in parallel with at least a portion of the second conductive path (213).

8. The battery protection board (20) according to claim 1, wherein: The battery protection board (20) further includes a first flexible extension board (26) and a second flexible extension board (27), wherein 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 member (22) is electrically connected to the second flexible extension board (27).

9. The battery protection board (20) according to claim 8, wherein: The circuit board (21) further includes a third conductive path (216), which is arranged on the board body (211) and is insulated from the first conductive path (212) and the second conductive path (213), and is electrically connected to the second flexible extension plate (27).

10. The battery protection board (20) according to claim 1, wherein: The circuit where the first conductive component (22) is located is arranged in parallel with the entire circuit of the first conductive path (212), or the circuit where the first conductive component (22) is located is arranged in parallel with a part of the circuit of the first conductive path (212).

11. The battery protection board (20) according to claim 8, wherein: The first flexible extension plate (26) is connected to one end of the flexible plate portion of the circuit board (21), and the second flexible extension plate (27) is connected to the other end of the flexible plate portion of the circuit board (21) which is opposite to the other end.

12. The battery protection board (20) according to claim 8, wherein: The first flexible extension plate (26) is provided with a first output end (261), the first conductive path (212) is electrically connected to the positive electrode of the first output end (261), the second flexible extension plate (27) is provided with a second output end (271), and the first conductive member (22) is connected to the positive electrode or the negative electrode of the second output end (271).

13. The battery protection board (20) according to claim 2, wherein: When the battery protection plate (20) is assembled, the first surface (214) faces the battery core (10), and the second surface (215) faces away from the battery core (10).

14. A battery device (100), wherein: The invention comprises a battery cell (10) and a battery protection board (20) according to any one of claims 1 to 13, wherein the battery cell (10) is connected to a first electrode (12) and a second electrode (11), a first conductive path (212) in the battery protection board (20) is electrically connected to the first electrode (12), and a second conductive path (213) in the battery protection board (20) is electrically connected to the second electrode (11).

15. An electrical device (200), wherein: The invention comprises an electric device (300) and a battery device (100) as claimed in claim 13, wherein the battery device (100) is used to supply power to the electric device (300).

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