Battery protection device, battery and electronic equipment

Abstract

The utility model provides a battery protection device, a battery and electronic equipment, and relates to the field of batteries. The battery protection device comprises a first conductive path, and the first conductive path is suitable for the charging and discharging process of a battery cell; the first conductive path comprises a first switch assembly, a first positive electrode end, a first negative electrode end and a first connecting end; the first positive electrode end and the first negative electrode end are respectively connected with the first connecting end; the first positive electrode end is connected with the first connecting end through the first switch assembly, and the first positive electrode end and the first negative electrode end are suitable for being connected with a battery cell; the second conductive path is suitable for the charge-discharge process of the battery cell; the second conductive path comprises a second switch assembly, a second positive electrode end, a second negative electrode end and a second connecting end; the second positive electrode end and the second negative electrode end are respectively connected with the second connecting end; the second positive electrode end is connected with the second connecting end through the second switch assembly, and the second positive electrode end and the second negative electrode end are suitable for being connected with the battery cell. The possibility of overheating of the battery protection device can be reduced, and the charging efficiency of the battery is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of battery, in particular to a battery protection device, a battery and an electronic device. BACKGROUND

[0002] With the rapid development of battery fast charging technology, the application of high-power battery charging is also more widely used. In the charging process of the battery, the battery will also generate more heat, so it is usually necessary to set up a battery protection device to reduce the possibility of damage to the battery during charging. However, the battery protection device is prone to overheating, which affects the charging efficiency of the battery. UTILITY MODEL CONTENT

[0003] The battery protection device, the battery and the electronic device provided by the embodiments of the present application solve the problem that the battery protection device is prone to overheating, which affects the charging efficiency of the battery.

[0004] The battery protection device provided by the embodiments of the present application comprises:

[0005] The first conductive path is suitable for the charging and discharging process of the battery cell; the first conductive path comprises a first switch assembly, a first positive electrode end, a first negative electrode end and a first connecting end; the first positive electrode end and the first negative electrode end are respectively connected to the first connecting end; the first positive electrode end is connected to the first connecting end through the first switch assembly, and the first positive electrode end and the first negative electrode end are suitable for being connected to the first battery cell.

[0006] The second conductive path is suitable for the charging and discharging process of the battery cell; the second conductive path comprises a second switch assembly, a second positive electrode end, a second negative electrode end and a second connecting end; the second positive electrode end and the second negative electrode end are respectively connected to the second connecting end; the second positive electrode end is connected to the second connecting end through the second switch assembly, and the second positive electrode end and the second negative electrode end are suitable for being connected to the first battery cell.

[0007] By adopting the above technical scheme, the battery protection device comprises a circuit board, a first connecting end and a second connecting end, the circuit board can be electrically connected to the corresponding port in the body of the electronic device through the first connecting end and the second connecting end, the circuit board can be connected to the battery cell through the first positive electrode end, the first negative electrode end, the second negative electrode end and the second positive electrode end, the first positive electrode end, the first negative electrode end and the first connecting end can be electrically connected, and the second positive electrode end, the second negative electrode end and the second connecting end can be electrically connected.

[0008] The circuit board forms a first conductive path between the battery cell, the first positive terminal, the first connecting terminal and the first negative terminal, and forms a second conductive path between the battery cell, the second positive terminal, the second connecting terminal and the second negative terminal, so as to realize the charging process of the battery cell. The two conductive paths formed by the battery cell and the battery protection device are independent of each other, so as to reduce the possibility of overlap between the two conductive paths, thereby reducing the possibility of local overheating of the battery protection device and improving the charging efficiency of the battery.

[0009] In some possible embodiments, the first switch assembly comprises a first switch unit and a third switch unit,

[0010] The first switch unit and the third switch unit are sequentially and in series arranged between the first positive terminal and the first connecting terminal.

[0011] The second switch assembly comprises a second switch unit and a fourth switch unit.

[0012] The second switch unit and the fourth switch unit are sequentially and in series arranged between the second positive terminal and the second connecting terminal.

[0013] In some possible embodiments, the battery protection device further comprises a control unit, which is configured to control the conduction or turn-off of the first switch assembly and the second switch assembly.

[0014] In some possible embodiments, the battery protection device further comprises a sampling assembly, which is arranged in the first conductive path and / or the second conductive path.

[0015] In some possible embodiments, the sampling assembly is connected between the first connecting terminal and the first switch assembly.

[0016] The sampling assembly is connected between the second connecting terminal and the second switch assembly.

[0017] In some possible embodiments, the first conductive path and the second conductive path share the sampling assembly.

[0018] In some possible embodiments, the sampling assembly comprises a current sampling unit, which is adapted to collect the current value of the first conductive path and / or the second conductive path.

[0019] In some possible embodiments, the battery protection device comprises a control unit, which is electrically connected to the control end of the first switch assembly, so as to control the conduction and turn-off of the first conductive path; and / or,

[0020] The control unit is electrically connected to a control end of the second switch assembly to control the on and off of the second conductive path.

[0021] In some possible implementations, the control unit includes a first control unit and a second control unit.

[0022] The first control unit is connected to the sampling assembly in the first conductive path, and the first control unit is connected to the sampling assembly in the second conductive path.

[0023] The second control unit is electrically connected to the sampling assembly in the first conductive path, and the second control unit is electrically connected to the sampling assembly in the second conductive path.

[0024] In some possible implementations, the first conductive path and the second conductive path are independent of each other.

[0025] In some possible implementations, the sampling assembly includes a first sampling assembly and a second sampling assembly; the first sampling assembly is arranged in the first conductive path, and the second sampling assembly is arranged in the second conductive path; and the first conductive path and the second conductive path work independently of each other.

[0026] In some possible implementations, the first conductive path and the second conductive path share the sampling assembly, and the first conductive path and the second conductive path only have the circuit coinciding at the sampling assembly.

[0027] In some possible implementations, the battery protection device includes a connecting portion and a circuit board.

[0028] The first positive terminal, the first negative terminal, the second positive terminal, the second negative terminal, and the circuit board are arranged.

[0029] The first connecting end and the second connecting end are arranged in the connecting portion.

[0030] In some possible implementations, the first switch assembly, the second switch assembly, and the control unit are arranged on the circuit board.

[0031] In some possible implementations, the connecting portion includes a wiring structure, and the first connecting end and the second connecting end are electrically connected to the circuit board through the wiring structure, respectively.

[0032] In some possible implementations, the connecting portion includes a first connecting portion and a second connecting portion, the first connecting end is arranged in the first connecting portion, and the second connecting end is arranged in the second connecting portion.

[0033] In some possible embodiments, the first connecting portion comprises a first circuit structure, and a first connecting end provided on the first circuit structure, the first connecting end being electrically connected to the circuit board through the first circuit structure; and / or,

[0034] the second connecting portion comprises a second circuit structure, and a second connecting end provided on the second circuit structure, the second connecting end being electrically connected to the circuit board through the second circuit structure.

[0035] In some possible embodiments, the circuit board extends along a first direction, and the connecting portion extends along a second direction, wherein the first end of the connecting portion is connected to the circuit board along the second direction, and the first direction is perpendicular to the second direction.

[0036] In some possible embodiments, the first connecting end and the second connecting end are arranged opposite to each other along the first direction.

[0037] In the first direction, the distance between the first connecting end and the second connecting end is less than the length of the circuit board.

[0038] In some possible embodiments, the connecting portion is arranged at the middle of the circuit board along the first direction.

[0039] In some possible embodiments, the circuit board comprises a first surface and a second surface opposite to each other along the thickness direction.

[0040] The first positive end, the first negative end, the second negative end and the second positive end are arranged on the first surface of the circuit board.

[0041] In some possible embodiments, the first switch assembly, the second switch assembly and the control unit are arranged on the second surface of the circuit board.

[0042] In some possible embodiments, along the first direction, the first positive end, the first negative end, the second negative end and the second positive end are arranged on the first surface of the circuit board in sequence.

[0043] In some possible embodiments, there is a reference axis between the first connecting end and the second connecting end; the first positive end and the second positive end are arranged on two sides of the reference axis respectively, and the first negative end and the second negative end are arranged on two sides of the reference axis respectively.

[0044] In some possible embodiments, in the first direction, the first connecting end is closer to the first positive end and the first negative end than the second connecting end; and in the first direction, the second connecting end is closer to the second positive end and the second negative end than the first connecting end.

[0045] In some possible embodiments, the first conductive path and the second conductive path are respectively located on two sides of the reference axis.

[0046] In some possible embodiments, the first switch assembly and the second switch assembly are symmetrically arranged along the reference axis.

[0047] The battery protection device further comprises a first control unit and a second control unit, and the first control unit and the second control unit are symmetrically arranged along the reference axis.

[0048] The first positive end and the second positive end are symmetrically arranged along the reference axis.

[0049] The first negative end and the second negative end are symmetrically arranged along the reference axis.

[0050] In some possible embodiments, the first conductive path and the second conductive path are mirror-symmetric along the reference axis.

[0051] In some possible embodiments, in the first direction, the second connecting end is closer to the first positive end and the first negative end than the first connecting end; and in the first direction, the first connecting end is closer to the second positive end and the second negative end than the second connecting end.

[0052] In some possible embodiments, the first negative end and the first connecting end are oppositely arranged in the second direction, and the second negative end and the second connecting end are oppositely arranged in the second direction.

[0053] In some possible embodiments, the battery protection device comprises a sampling assembly, and the sampling assembly is arranged in the first conductive path and the second conductive path.

[0054] The first switch assembly, the sampling assembly and the second switch assembly are sequentially arranged on the circuit board in the first direction; and / or,

[0055] At least one of the first connecting end and the second connecting end is oppositely arranged with the sampling assembly in the second direction; and / or,

[0056] In the first direction, the sampling assembly is located between the first switch assembly and the second switch assembly.

[0057] The first direction and the second direction are perpendicular.

[0058] In some possible implementation manners, the circuit board and the connecting portion are located in the same plane.

[0059] The battery provided by the embodiment of the present application comprises a first battery cell and the battery protection device, and the first battery cell and the battery protection device are electrically connected.

[0060] In some possible implementation manners, the first battery cell is provided with a first positive electrode conductive piece, a first negative electrode conductive piece, a second negative electrode conductive piece and a second positive electrode conductive piece.

[0061] The first positive electrode conductive piece is electrically connected with the first positive electrode end, and the first negative electrode conductive piece is electrically connected with the first negative electrode end.

[0062] The second positive electrode conductive piece is electrically connected with the second positive electrode end, and the second negative electrode conductive piece is electrically connected with the second negative electrode end.

[0063] In some possible implementation manners, the first positive electrode conductive piece, the first negative electrode conductive piece, the second negative electrode conductive piece and the second positive electrode conductive piece are sequentially and spacedly arranged.

[0064] In some possible implementation manners, the battery is further provided with a first rivet and a second rivet.

[0065] The first positive electrode conductive piece is electrically connected with the first positive electrode end through the first rivet, and the second positive electrode conductive piece is electrically connected with the second positive electrode end through the second rivet.

[0066] In some possible implementation manners, the first battery cell is arranged as a steel shell battery cell.

[0067] In some possible implementation manners, the first battery cell comprises a first electrode assembly and a shell, the shell is adapted to form a containing cavity, and the electrode assembly is arranged in the containing cavity; the electrode assembly comprises two positive electrode assemblies and one negative electrode assembly.

[0068] The two positive electrode assemblies are electrically connected with the first positive electrode conductive piece and the second positive electrode conductive piece respectively.

[0069] The negative electrode assembly is electrically connected with the first negative electrode conductive piece and the second negative electrode conductive piece.

[0070] In some possible implementation manners, the first battery cell has a central axis, and the first connecting end and the second connecting end are symmetrically arranged along the central axis.

[0071] In some possible implementation manners, the first electric core has a central axis, and the first positive electrode end and the second positive electrode end are symmetrically arranged along the central axis; and the first negative electrode end and the second negative electrode end are symmetrically arranged along the central axis.

[0072] The embodiment of the present application further provides an electronic device comprising the battery of any one of the above and an electronic device body for accommodating the battery.

[0073] When the battery is fixed in the electronic device body, the first connecting end and the second connecting end are used for being electrically connected with corresponding ports in the electronic device body respectively.

[0074] Since the electronic device comprises the battery of any one of the above, the electronic device has the advantages of the battery of any one of the above, and specific reference can be made to the related description above, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0075] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0076] Figure 1 A structural schematic diagram of a battery in the related art;

[0077] Figure 2 A structural schematic diagram of a first surface of a battery protection device in the embodiment of the present application;

[0078] Figure 3 A structural schematic diagram of a second surface of a battery protection device in the embodiment of the present application;

[0079] Figure 4 A mirror image schematic diagram of a first conductive channel and a second conductive channel when the battery protection device in the embodiment of the present application is connected to a first electric core;

[0080] Figure 5 A schematic diagram of component connection of the battery protection device in the first implementation manner of the embodiment of the present application;

[0081] Figure 6 A circuit diagram of the battery protection device in the first implementation manner of the embodiment of the present application;

[0082] Figure 7 A schematic diagram of component connection of the battery protection device in the second implementation manner of the embodiment of the present application;

[0083] Figure 8 A circuit diagram of the battery protection device in the second implementation manner of the embodiment of the present application;

[0084] Figure 9Figure 3 is a schematic diagram of the connection of components of the battery protection device according to the third embodiment of the present application;

[0085] Figure 10 Figure 4 is a circuit diagram of the battery protection device according to the third embodiment of the present application;

[0086] Figure 11 Figure 5 is a schematic diagram of the structure of the first cell according to the first embodiment of the present application.

[0087] Legend of reference numerals:

[0088] 10, first conductive path; 20, second conductive path;

[0089] 100, circuit protection device;

[0090] 101, positive terminal; 102, negative terminal;

[0091] 110, circuit board; 111, first positive terminal; 112, first negative terminal; 113, second positive terminal; 114, second negative terminal; 120, connecting portion; 130, first switch assembly; 131, first switch unit; 132, third switch unit; 140, second switch assembly; 141, second switch unit; 142, fourth switch unit; 150, sampling assembly; 160, control unit; 161, first control unit; 162, second control unit; 170, coulometer;

[0092] 200, first connecting terminal;

[0093] 300, second connecting terminal;

[0094] 400, first cell;

[0095] 410, first positive conductive member; 420, first negative conductive member; 430, second positive conductive member; 440, second negative conductive member; 450, first rivet; 460, second rivet; 470, cover plate; 471, liquid injection hole; 472, rubber rivet; 473, insulating member.

[0096] The specific embodiments of the present application have been shown in the above-described drawings, and will be described in more detail hereinafter. These drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0097] As described in the background section, the battery also generates more heat during the charging process, and thus a battery protection device is usually provided to reduce the possibility of damage to the battery during the charging process. Referring to Figure 1The battery protection device includes a circuit board 100, a first connecting end 200 and a second connecting end 300. The circuit board 100 can be electrically connected to the electronic device body through the first connecting end 200 and the second connecting end 300. The circuit board 100 is provided with a positive electrode end 101 and a negative electrode end 102 for connecting the first battery cell.

[0098] The circuit board 100 can be electrically connected to the corresponding port in the electronic device body through the first connecting end 200 and the second connecting end 300. The circuit board 100 can be connected to the battery cell 400 through the positive electrode end 101 and the negative electrode end 102. The positive electrode end 101 and the negative electrode end 102 can be electrically connected to the first connecting end 200. The positive electrode end 101 and the negative electrode end 102 can be electrically connected to the second connecting end 300.

[0099] During the charging process of the battery, the battery cell 400 forms one path with the positive electrode end 101, the first connecting end 200 and the negative electrode end 102. The battery cell 400 forms another path with the positive electrode end 101, the second connecting end 300 and the negative electrode end 102. Thus, the charging process of the battery cell can be realized. The battery protection device can protect the charging process of the battery.

[0100] However, the first connecting end 200 and the second connecting end 300 are usually arranged on both sides of the length direction of the circuit board 100. The distance between the first connecting end 200 and the positive electrode end 101 and the negative electrode end 102 is large. The distance between the second connecting end 300 and the positive electrode end 101 and the negative electrode end 102 is large. The path formed by the battery cell 400, the positive electrode end 101, the first connecting end 200 and the negative electrode end 102 is long. The path formed by the battery cell 400, the positive electrode end 101, the second connecting end 300 and the negative electrode end 102 is long. The resistances of the two paths are large. The battery protection device is prone to overheating, which affects the charging efficiency of the battery.

[0101] In the above embodiments, the number 200 is used to indicate the reinforcing piece of the first connecting end, which is intended to indicate the position of the first connecting end. Figure 3 In the above embodiments, the number 300 is used to indicate the reinforcing piece of the second connecting end, which is intended to indicate the position of the second connecting end. Figure 3

[0102] To solve the above technical problems, the application provides a battery protection device, a battery and an electronic device. The battery protection device includes a circuit board, a first connecting end and a second connecting end. The circuit board can be electrically connected to the corresponding port in the electronic device body through the first connecting end and the second connecting end. The circuit board can be connected to the battery cell through the first positive electrode end, the first negative electrode end, the second negative electrode end and the second positive electrode end. The first positive electrode end, the first negative electrode end and the first connecting end can be electrically connected. The second positive electrode end, the second negative electrode end and the second connecting end can be electrically connected. ​

[0103] The first connecting end and the second connecting end are arranged on the connecting part, the connecting part is connected with the middle part of the circuit board, the positive end of the first connecting end is electrically connected with the first positive end through the first switch assembly, and the positive end of the second connecting end can be electrically connected with the second positive end through the second switch assembly. In the charging process of the battery, the electric core forms a first conductive path with the first positive end, the first connecting end and the first negative end, and forms a second conductive path with the second positive end, the second connecting end and the second negative end, so that the charging process of the electric core can be realized. Since the first connecting end and the second connecting end are located in the middle part of the circuit board, the first positive end and the first negative end are arranged on the same side and close to each other, and the second positive end and the second negative end are arranged on the same side and close to each other, so that the paths of the two paths formed by the electric core and the battery protection device are short, thereby reducing the possibility of overheat of the battery protection device and improving the charging efficiency of the battery.

[0104] The exemplary embodiments will be described in detail hereinbelow with reference to the drawings. In the following description, the same numbers in different drawings represent the same or similar elements unless otherwise represented. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the present application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the present application as detailed in the appended claims.

[0105] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes can not be described again in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0106] Referring to Figures 2-4 The embodiment of the present application provides a battery protection device 100, which comprises a circuit board 110 and a connecting part 120. The connecting part 120 can comprise a first connecting part and a second connecting part matched with each other. The circuit board 100 can be electrically connected with corresponding ports in the body of an electronic device through the first connecting part and the second connecting part. It should be noted that the first connecting part and the second connecting part can be separate or integrally formed, which is not limited here.

[0107] Exemplarily, the connecting part can comprise a line structure and a connecting end arranged on the line structure. The connecting end can be electrically connected with the circuit board through the line structure.

[0108] The first connecting part can comprise a first line structure and a first connecting end 200 arranged on the first line structure. The first connecting end 200 is electrically connected with the circuit board 110 through the first line structure.

[0109] The second connecting portion can include a second line structure, and a second connecting end 300 disposed on the second line structure and electrically connected to the circuit board 110 through the second line structure.

[0110] The circuit board 110 extends along a first direction (i.e., the x direction in the figure), the first end of the connecting portion 120 is connected to the middle part of the circuit board 110, and the second end of the connecting portion 120 extends along a second direction (i.e., the y direction in the figure), and the first direction and the second direction are arranged vertically.

[0111] For example, the number of connecting portions can be one.

[0112] Alternatively, the number of connecting portions can also be multiple, and each connecting portion can be used to electrically connect to a corresponding port in the electronic device body.

[0113] The number of connecting ends can also be multiple, and the multiple connecting portions are one-to-one corresponding to the multiple connecting ends, each connecting portion can be provided with one connecting end, so that each connecting end can be electrically connected to the circuit board through the corresponding connecting portion.

[0114] It should be noted that the first direction and the second direction are arranged vertically, which can be used to indicate that the extension direction of the circuit board 110 and the extension direction of the connecting portion 120 are arranged vertically or approximately vertically.

[0115] The circuit board 110 and the connecting portion 120 can be located in the same plane. The first end of the connecting portion 120 is connected to the middle part of the circuit board 110, which can be used to indicate that the circuit board 110 can be symmetrically arranged relative to the connecting portion 120.

[0116] The distance between the first connecting end 200 and the second connecting end 300 of the connecting portion 120 and any position on the circuit board 110 in the first direction is less than or equal to the length of the circuit board 110 in the first direction, so as to reduce the distance between the first connecting end 200 and the second connecting end 300 and the components of the battery protection device on the circuit board 110.

[0117] For example, the distance between the first connecting end 200 and the second connecting end 300 of the connecting portion 120 and any position on the circuit board 110 in the first direction can be less than or equal to half of the length of the circuit board 110 in the first direction.

[0118] For example, the circuit board 110 is provided with a first positive electrode end 111, a first negative electrode end 112, a second negative electrode end 114 and a second positive electrode end 113 arranged in sequence along the first direction, and the circuit board 100 can be electrically connected to the battery cell 400 through the first positive electrode end 111, the first negative electrode end 112, the second negative electrode end 114 and the second positive electrode end 113.

[0119] The first positive terminal 111 is configured to be electrically connected with the first positive conductive member 410 of the battery cell 400, and the first negative terminal 112 is configured to be electrically connected with the first negative conductive member 420 of the battery cell 400. The second positive terminal 113 is configured to be electrically connected with the second positive conductive member 430 of the battery cell 400, and the second negative terminal 114 is configured to be electrically connected with the second negative conductive member 440 of the battery cell 400.

[0120] The first connection terminal 200 and the second connection terminal 300 are arranged on the connecting portion 120, and the circuit board 100 can be electrically connected with corresponding ports in the electronic device body through the first connection terminal 200 and the second connection terminal 300. The first connection terminal 200 is electrically connected with the first positive terminal 111 and the first negative terminal 112 through the circuit board 100, and the second connection terminal 300 is electrically connected with the second positive terminal 113 and the second negative terminal 114 through the circuit board 100.

[0121] During the charging process of the battery, the battery cell 400 forms one of the conductive paths with the first positive terminal 111, the first connection terminal 200 and the first negative terminal 112, and forms another conductive path with the second positive terminal 113, the second connection terminal 300 and the second negative terminal 114, so as to realize the charging process of the battery cell 400.

[0122] It should be noted that the number of conductive paths can also be three or more, and the conductive paths can be used to realize the charging process of the battery cell 400.

[0123] When the number of conductive paths is three or more, the conductive paths can be independently arranged, and the conductive paths can be completely overlapped, and the adjacent conductive paths can not be overlapped, so as to reduce the possibility of local overheating of the battery protection device 100.

[0124] Alternatively, the adjacent two conductive paths can be crossed by sharing components or the like, but due to the small number of intersections between the adjacent two conductive paths, the possibility of mutual interference between the adjacent two conductive paths is small.

[0125] When the number of conductive paths is two, the two conductive paths can include a first conductive path and a second conductive path which are independent of each other. When the number of conductive paths is three or more, the first conductive path and the second conductive path can be described as an example to define the arrangement mode of the adjacent two conductive paths in the three or more conductive paths.

[0126] In some possible embodiments, the battery protection device 100 can be provided as an integrated soft and hard combined board FPCB 100, where the circuit board 110 is a hard board PCB, and the connecting portion 120 is a soft board FPC, and the connecting portion 120 is bendable. Alternatively, the battery protection device 100 can be provided as a battery protection device 100 in which a hard board PCB and a soft board FPC are electrically connected by a soldering method such as reflow soldering, where the circuit board 110 includes a main body portion of the hard board PCB and the soft board FPC, and the connecting portion 120 includes an extended portion of the soft board FPC, and the connecting portion 120 is bendable.

[0127] In the battery protection device 100, the first positive terminal 111, the first negative terminal 112, the second negative terminal 114, and the second positive terminal 113 can be L-shaped nickel-based conductive pieces, or L-shaped copper-nickel-plated substrates or other substrate conductive pieces. When the battery protection device 100 is connected to the battery cell 400 through the first positive terminal 111, the first negative terminal 112, the second negative terminal 114, and the second positive terminal 113, the first positive terminal 111, the first negative terminal 112, the second negative terminal 114, and the second positive terminal 113 can be bent so that the plane in which the width direction of the circuit board 110 of the battery protection device 100 is located is parallel to the thickness direction of the battery cell 400, and the connecting portion 120 is away from the battery cell 400 relative to the circuit board 110. The bendable connecting portion 120 can make the plane in which the first connecting end (200) and the second connecting end (300) are located perpendicular to the plane in which the circuit board 110 is located, so as to be electrically connected to the corresponding ports in the body of the electronic device, respectively.

[0128] For example, the circuit board 100 can include a first surface and a second surface opposite to each other in the thickness direction, and the first surface of the circuit board 100 and the second surface of the circuit board 100 can be used to connect the first connecting end 200 and the second connecting end 300, and to arrange the first positive terminal 111, the first negative terminal 112, the second negative terminal 114, and the second positive terminal 113.

[0129] The first surface and the second surface of the circuit board 110 can be used to arrange the components of the battery protection device. For example, among the first surface and the second surface of the circuit board 110, the first positive terminal 111, the first negative terminal 112, the second negative terminal 114, and the second positive terminal 113 can be arranged on the first surface, and the second surface of the circuit board 110 can be used to arrange other components of the battery protection device.

[0130] In the first direction, the first positive terminal 111, the first negative terminal 112, the second negative terminal 114, and the second positive terminal 113 can be arranged on the first surface of the circuit board 110 in sequence.

[0131] Reference Figures 2-4In some possible embodiments, the first connection end 200 and the second connection end 300 can be arranged along a first direction. A reference axis L can be formed between the first connection end 200 and the second connection end 300. In the first direction, the first connection end 200 can be disposed on one side of the reference axis L, and the second connection end 300 can be disposed on the other side of the reference axis L.

[0132] For example, the first positive electrode end 111 and the second positive electrode end 113 can be respectively disposed on the two sides of the reference axis L, and the first negative electrode end 112 and the second negative electrode end 114 can be respectively disposed on the two sides of the reference axis L.

[0133] The first positive electrode end 111 and the first negative electrode end 112 can be disposed on the same side relative to the reference axis L, and can be disposed on the side where the first connection end 200 is located. The second positive electrode end 113 and the second negative electrode end 114 can be disposed on the same side relative to the reference axis L, and can be disposed on the side where the second connection end 300 is located.

[0134] In the charging and discharging process of the battery, the first positive electrode end 111 is used to be electrically connected with the first positive electrode conductive part 410 of the battery cell 400, the first negative electrode end 112 is used to be electrically connected with the first negative electrode conductive part 420 of the battery cell 400, and the battery cell 400 forms a first conductive path 10 with the first positive electrode end 111, the first connection end 200 and the first negative electrode end 112.

[0135] The second positive electrode end 113 is used to be electrically connected with the second positive electrode conductive part 430 of the battery cell 400, and the second negative electrode end 114 is used to be electrically connected with the second negative electrode conductive part 440 of the battery cell 400. The battery cell 400 forms a second conductive path 20 with the second positive electrode end 113, the second connection end 300 and the second negative electrode end 114, so as to realize the charging and discharging process of the battery cell 400.

[0136] It can be easily understood that the first positive electrode end 111 and the first negative electrode end 112 can be disposed on the side where the first connection end 200 is located, so as to reduce the path length of the first conductive path 10 and reduce the internal resistance of the first conductive path 10. The second positive electrode end 113 and the second negative electrode end 114 can be disposed on the side where the second connection end 300 is located, so as to reduce the path length of the second conductive path 20 and reduce the internal resistance of the second conductive path 20, thereby reducing the heat generation of the battery protection device, reducing the possibility of overheat of the battery protection device, and improving the charging efficiency of the battery.

[0137] Reference Figures 2-4 For example, the first positive electrode end 111 and the second positive electrode end 113 can be symmetrically disposed relative to the reference axis L, and the first negative electrode end 112 and the second negative electrode end 114 can be symmetrically disposed relative to the reference axis L.

[0138] The first conductive path 10 and the second conductive path 20 can be symmetric or approximately symmetric relative to the reference axis L, so that the first conductive path 10 and the second conductive path 20 are arranged on both sides of the reference axis L, and the length of the first conductive path 10 and the length of the second conductive path 20 are the same or approximately the same.

[0139] The first conductive path 10 and the second conductive path 20 can be independent of each other, so as to reduce the possibility of the first conductive path 10 and the second conductive path 20 crossing each other and the like, and reduce the possibility of the battery protection device locally generating excessive heat.

[0140] When the relative positions of the first positive terminal 111, the first negative terminal 112 and the first connecting terminal 200 in the first conductive path 10 are arranged to shorten the length of the first conductive path 10, the relative positions of the second positive terminal 113, the second negative terminal 114 and the second connecting terminal 300 in the second conductive path 20 can be adjusted to shorten the length of the second conductive path 20.

[0141] Since the first conductive path 10 and the second conductive path 20 are symmetric or approximately symmetric relative to the reference axis L, the length of the first conductive path 10 and the length of the second conductive path 20 are the same or approximately the same, and the first conductive path 10 and the second conductive path 20 do not coincide with each other, so as to reduce the possibility that the heat generated by the first conductive path 10 and the second conductive path 20 is superimposed to cause the circuit board 100 to locally generate excessive heat.

[0142] In some possible embodiments, in the first direction, the first connecting terminal 200 can be closer to the first positive terminal 111 and the first negative terminal 112 than the second connecting terminal 300, so as to further shorten the length of the first conductive path 10, reduce the internal resistance of the first conductive path 10, and reduce the heat generated by the first conductive path 10.

[0143] In the first direction, the second connecting terminal 300 is closer to the second positive terminal 113 and the second negative terminal 114 than the first connecting terminal 200, so as to further shorten the length of the second conductive path 20, reduce the internal resistance of the second conductive path 20, and reduce the heat generated by the second conductive path 20.

[0144] For example, the first connecting terminal 200 and the second connecting terminal 300 can be arranged in the first direction.

[0145] The first negative terminal 112 and the first connecting terminal 200 can be arranged along the second direction to shorten the distance between the first negative terminal 112 and the first connecting terminal 200, thereby shortening the length of the first conductive path 10. The second negative terminal 114 and the second connecting terminal 300 can be arranged along the second direction to shorten the distance between the second negative terminal 114 and the second connecting terminal 300, thereby shortening the length of the second conductive path 20.

[0146] By adopting the technical solution, the circuit board 100 can be electrically connected to the corresponding port in the electronic device body through the first connecting terminal 200 and the second connecting terminal 300, and the circuit board 100 can be connected to the battery cell 400 through the first positive terminal 111, the first negative terminal 112, the second negative terminal 114, and the second positive terminal 113. The first positive terminal 111, the first negative terminal 112, and the first connecting terminal 200 can be electrically connected, and the second positive terminal 113, the second negative terminal 114, and the second connecting terminal 300 can be electrically connected.

[0147] Alternatively, in some possible embodiments, in the first direction, the first connecting terminal 200 can be closer to the second positive terminal 113 and the second negative terminal 114 than the second connecting terminal 300.

[0148] In the first direction, the second connecting terminal 300 can be closer to the first positive terminal 111 and the first negative terminal 112 than the first connecting terminal 200.

[0149] That is, the first conductive path 10 and the second conductive path 20 can locally cross each other, so that the first connecting terminal 200 and the second connecting terminal 300 are arranged in a staggered manner relative to the corresponding conductive paths.

[0150] For example, the first conductive path 10 and the second conductive path 20 can share the sampling assembly 150, so that the first conductive path 10 and the second conductive path 20 can locally cross each other at the sampling assembly 150, thereby enabling the positions of the first connecting terminal 200 and the second connecting terminal 300 to be adjusted, and the lengths of the first conductive path 10 and the second conductive path 20 change less, which also makes the heat generation of the battery protection device not change greatly.

[0151] Alternatively, the first conductive path 10 and the second conductive path 20 can also be partially crossed by a wire or the like structure, or the positions of the first connecting end 200 and the second connecting end 300 can be adjusted. The first connecting end 200 and the second connecting end 300 are arranged on the connecting portion 120, which is connected to the middle portion of the circuit board 110. During the charging process of the battery, the first conductive path 10 is formed by the cell 400, the first positive electrode end 111, the first connecting end 200 and the first negative electrode end 112, and the second conductive path 20 is formed by the cell 400, the second positive electrode end 113, the second connecting end 300 and the second negative electrode end 114, so that the charging process of the cell 400 can be realized.

[0152] Since the first connecting end 200 and the second connecting end 300 are located in the middle portion of the circuit board 110, the first positive electrode end 111 and the first negative electrode end 112 are arranged on the same side and close to each other, and the second positive electrode end 113 and the second negative electrode end 114 are arranged on the same side and close to each other, so that the first conductive path 10 and the second conductive path 20 formed by the cell 400 and the battery protection device are symmetrically or approximately symmetrically arranged, and the shunt of the charging current can be realized.

[0153] By passing the charging current through the two branches of the first conductive path 10 and the second conductive path 20, the current of each branch is only half of the charging current, which reduces the excessive charging current of a single charging branch, and according to the heat formula Q = I 2 Rt, the heat generated in the charging process can be greatly reduced, and the charging speed and efficiency can be improved.

[0154] Moreover, the two charging branches of the first conductive path 10 and the second conductive path 20 can also increase the charging current, reduce the excessive charging current of a single charging branch, and improve the charging speed and efficiency. Moreover, the paths of the first conductive path 10 and the second conductive path 20 are relatively short, so that the possibility of overheat of the battery protection device can be reduced, and the charging efficiency of the battery can be improved.

[0155] Moreover, the two charging branches of the first conductive path 10 and the second conductive path 20 can also increase the charging current, improve the charging efficiency of the battery. Moreover, the paths of the first conductive path 10 and the second conductive path 20 are relatively short, so that the possibility of overheat of the battery protection device can be reduced, and the charging speed and efficiency can be improved.

[0156] Reference Figures 2-4 In some possible embodiments, the battery protection device can further include a first switch assembly 130, a second switch assembly 140 and a sampling assembly 150 arranged on the circuit board 100.

[0157] The positive terminal of the first connecting terminal 200 can be electrically connected with the first positive terminal 111 through the first switch assembly 130, and the positive terminal of the second connecting terminal 300 can be electrically connected with the second positive terminal 113 through the second switch assembly 140. The first switch assembly 130 can be used to form the first conductive path 10.

[0158] The positive terminal of the first connecting terminal 200 can be electrically connected with the first switch assembly 130 through the sampling assembly 150, and the positive terminal of the second connecting terminal 300 can be electrically connected with the second switch assembly 140 through the sampling assembly 150. The second switch assembly 140 can be used to form the second conductive path 20.

[0159] The first positive terminal 111, the first negative terminal 112, the second negative terminal 114 and the second positive terminal 113 can be arranged on the first surface of the circuit board 100. The first switch assembly 130, the second switch assembly 140 and the sampling assembly 150 can be arranged on the second surface of the circuit board 100, so that the first surface and the second surface of the circuit board 100 can be used to connect different components of the battery protection device, thereby reducing the area of the circuit board 100 and making the layout of the components of the battery protection device more reasonable. Of course, in some embodiments, the first switch assembly 130, the second switch assembly 140 and the sampling assembly 150 can be arranged on the connecting portion 120.

[0160] For example, the sampling assembly 150 can include a current sampling resistor, or can include a plurality of current sampling units connected in parallel to reduce internal resistance and improve heat dissipation performance.

[0161] The sampling assembly can include a first sampling assembly and a second sampling assembly. The first sampling assembly is arranged on the first conductive path 10, and the second sampling assembly is arranged on the second conductive path 20. The first conductive path 10 and the second conductive path 20 work independently of each other to reduce the possibility of overlap between the first conductive path 10 and the second conductive path 20.

[0162] In some possible embodiments, the first switch assembly 130, the sampling assembly 150 and the second switch assembly 140 can be arranged in the first direction in sequence on the circuit board 110.

[0163] For example, at least one of the first connecting terminal 200 and the second connecting terminal 300 can be arranged in the second direction with the sampling assembly 150 to shorten the path length of the first conductive path 10 and the second conductive path 20.

[0164] For example, the first connecting terminal 200 and the second connecting terminal 300 are arranged opposite to each other in the second direction with the sampling assembly 150. The first connecting terminal 200 can be arranged opposite to the sampling assembly 150, and the positive terminal of the first connecting terminal 200 is electrically connected with the sampling assembly 150.

[0165] The two conductive paths share the sampling component 150. The first conductive path 10 and the second conductive path 20 can share the sampling component 150, and the first conductive path 10 and the second conductive path 20 only have the circuit overlap at the sampling component 150.

[0166] The second connecting end 300 can be opposite to the sampling component 150, and the positive end of the second connecting end 300 is electrically connected to the sampling component 150, so as to reduce the distance between the first connecting end 200, the second connecting end 300 and the sampling component 150, thereby shortening the path length of the first conductive path 10 and the second conductive path 20.

[0167] In the first direction, the sampling component 150 can be located between the first positive end 111 and the second positive end 113. For example, a part of the sampling component 150 can be located on the side of the reference axis L where the first positive end 111 is located, and another part of the sampling component 150 can be located on the side of the reference axis L where the second positive end 113 is located, so as to shorten the distance between the first positive end 111 and the sampling component 150 and shorten the distance between the second positive end 113 and the sampling component 150.

[0168] The first switch component 130 can include a first switch unit 131 and a third switch unit 132, which can be connected in series between the first positive end 111 and the sampling component 150 in sequence, so as to control the on-off of the first conductive path 10 through the first switch unit 131 and the third switch unit 132.

[0169] The second switch component 140 can include a second switch unit 141 and a fourth switch unit 142, which can be connected in series between the second positive end 113 and the sampling component 150 in sequence, so as to control the on-off of the second conductive path 20 through the second switch unit 141 and the fourth switch unit 142.

[0170] In some possible embodiments, the first connecting end 200, the first switch component 130, the first positive end 111, the first negative end 112 and the sampling component 150 can form the first conductive path 10. The second connecting end 300, the second switch component 140, the second positive end 113, the second negative end 114 and the sampling component 150 can form the second conductive path 20.

[0171] In the circuit board 100, the first conductive path 10 and the second conductive path 20 do not overlap, so as to reduce the possibility that the heat generated by the first conductive path 10 and the second conductive path 20 is superimposed to make the local heat of the circuit board 100 too large.

[0172] Reference Figures 2-4In some possible embodiments, the battery protection device further comprises a control unit 160. The control unit 160 can be used to control the on or off of the first switch assembly 130 and the second switch assembly 140.

[0173] The control unit 160 can be electrically connected or communicatively connected to the control end of the first switch assembly 130 to control the on or off of the first conductive path 10.

[0174] The control unit 160 can be electrically connected or communicatively connected to the control end of the second switch assembly 140 to control the on or off of the second conductive path 20.

[0175] The control unit 160 can comprise a first control unit 161 and a second control unit 162. The first control unit 161 can be disposed in the first conductive path 10 and the second conductive path 20. The first control unit 161 can be electrically connected to the sampling assembly 150 in the first conductive path 10, and the first control unit 161 can also be electrically connected to the sampling assembly 150 in the second conductive path 20.

[0176] The second control unit 162 can be disposed in the first conductive path 10 and the second conductive path 20. The second control unit 162 can be electrically connected to the sampling assembly 150 in the second conductive path 20, and the second control unit 162 can also be electrically connected to the sampling assembly 150 in the first conductive path 10.

[0177] The charging control end and the discharging control end of the first control unit 161 can output a voltage greater than or equal to 4V relative to the positive electrode of the battery cell 400 to drive the first switch unit 131 and the second switch unit 141 to be open. The charging control end and the discharging control end of the second control unit 162 can output a voltage greater than or equal to 4V relative to the positive electrode of the battery cell 400 to drive the third switch unit 132 and the fourth switch unit 142 to be open. The sampling assembly 150, the first switch unit 131, and the third switch unit 132 can be disposed between the first positive end 111 and the positive end of the first connecting end 200.

[0178] The sampling assembly 150, the second switch unit 141, and the fourth switch unit 142 can be disposed between the second positive end 113 and the positive end of the second connecting end 300.

[0179] For example, the first control unit 161 can be used to detect the first current value flowing through the sampling assembly 150. The first control unit 161 can also detect the first voltage value between the first positive conductive part 410 and the first negative conductive part 420 of the battery cell 400 and the second voltage value between the second positive conductive part 430 and the second negative conductive part 440 of the battery cell 400 to obtain the first voltage average of the first voltage value and the second voltage value.

[0180] The first control unit 161 can control the first switch unit 131 and the second switch unit 141 to be turned off when at least one of the first current value and the first voltage average value reaches a corresponding protection threshold, thereby protecting the battery cell 400 through the first control unit 161.

[0181] The second control unit 162 can be configured to detect a second current value flowing through the sampling assembly 150, and detect a third voltage value between the first positive conductive member 410 and the first negative conductive member 420 of the battery cell 400 and a fourth voltage value between the second positive conductive member 430 and the second negative conductive member 440 of the battery cell 400, and obtain a second voltage average value of the third voltage value and the fourth voltage value.

[0182] The second control unit 162 can control the third switch unit 132 and the fourth switch unit 142 to be turned off when at least one of the second current value and the second voltage average value reaches a corresponding protection threshold, thereby protecting the battery cell 400 through the second control unit 162.

[0183] The circuit board 100 can further be provided with a coulometer unit 170. The coulometer unit 170 can be configured to measure the battery capacity, detect the temperature, and communicate with the electronic device. The control unit 160 and the coulometer unit 170 can be integrated into a coulometer control unit to realize the functional integration of the control unit 160 and the coulometer unit 170.

[0184] Embodiment One

[0185] Reference Figure 4 , and Figure 5 and Figure 6 In the protection circuit of the battery protection device, the first switch unit S1, the second switch unit S2, the third switch unit S3, the fourth switch unit S4, and the sampling assembly can be arranged between the positive end of the battery cell and the positive end of the first connection end.

[0186] The sampling assembly is electrically connected to the first positive end 111 through the third switch unit S3 and the first switch unit S1, and is electrically connected to the second positive end 113 through the fourth switch unit S4 and the second switch unit S2.

[0187] The first positive end 111, the first switch unit S1, the third switch unit S3, the sampling assembly, the first connection end, and the first negative end 112 can collectively form a first conductive path with the battery cell. The first positive end 113, the second switch unit S2, the fourth switch unit S4, the sampling assembly, the second connection end, and the second negative end 114 can collectively form a second conductive path with the battery cell.

[0188] The first control unit can be electrically connected with the first conductive path, and the second control unit is electrically connected with the first conductive path, forming the first conductive path. The first control unit is electrically connected with the second conductive path, and the second control unit is also electrically connected with the second conductive path, forming the second conductive path.

[0189] The charging control end and the discharging control end of the first control unit can output a voltage greater than or equal to 4V relative to the positive electrode of the battery cell, to drive the first switch unit and the second switch unit to open. The charging control end and the discharging control end of the second control unit can output a voltage greater than or equal to 4V relative to the positive electrode of the battery cell, to drive the third switch unit and the fourth switch unit to open.

[0190] The first switch unit S1 includes a charging switch K1 and a discharging switch K2, the second switch unit S2 includes a charging switch K3 and a discharging switch K4, the third switch unit S3 includes a charging switch K5 and a discharging switch K6, and the fourth switch unit S4 includes a charging switch K7 and a discharging switch K8.

[0191] The sampling assembly can include current sampling resistors RS1 and RS2. The first control unit includes a first controller U1, current limiting resistors RV1, RV2, RV3, RV4, and a filter capacitor C1.

[0192] The first control unit can also include other elements and pin definitions. The first controller U1 has a high-side drive capability. The charging control end CO1 and the discharging control end DO1 of the first controller U1 can output a high-level voltage relative to the positive end of the battery cell. The high-level voltage can be greater than or equal to 4V. The high-level voltage range can be 4-5V, or 4-6V, or other ranges of voltage.

[0193] When the charging control end CO1 and the discharging control end DO1 of the first controller U1 output a high-level voltage, the charging control end CO1 opens the charging switch K1 of the first switch unit S1, and the discharging control end DO1 opens the discharging switch K2 of the first switch unit S1, so that a conduction circuit is formed between the L1 end and the L2 end of the first switch unit S1. At the same time, the charging control end CO1 opens the charging switch K3 of the second switch unit S2, and the discharging control end DO1 opens the discharging switch K4 of the second switch unit S2, so that a conduction circuit is formed between the L3 end and the L4 end of the second switch unit S2.

[0194] The first controller U1 samples the first voltage value between the first positive conductive member and the first negative conductive member of the battery cell through the current limiting resistor RV1, and samples the second voltage value between the second positive conductive member and the second negative conductive member of the battery cell through the current limiting resistor RV2, to obtain the first voltage average of the first voltage value and the second voltage value.

[0195] The first controller also detects the first total current value flowing through the current sampling resistor RS1 and the current sampling resistor RS2. The first controller U1, the first switch unit S1, the second switch unit S2, the current sampling resistor RS1, the current sampling resistor RS2, the current limiting resistor RV1, the current limiting resistor RV2, the current limiting resistor RV3, the current limiting resistor RV4, and the filter capacitor C1 constitute the first protection circuit.

[0196] The second control unit includes the second controller U2, the current limiting resistor RV5, the current limiting resistor RV6, the current limiting resistor RV7, the current limiting resistor RV8, and the filter capacitor C2. The second control unit can also include other elements and pin definitions. The second controller U2 has a high-end driving capability. The charging control end CO2 and the discharging control end DO2 of the second controller U2 can output a voltage greater than or equal to a high-level voltage relative to the positive end of the battery cell. The high-level voltage can be greater than or equal to 4V. The high-level voltage range can be 4-5V, 4-6V, or other ranges of voltage.

[0197] When the charging control end CO2 and the discharging control end DO2 of the second controller U2 output a high-level voltage, the charging control end CO2 turns on the charging switch K5 of the third switch unit S3, and the discharging control end DO2 turns on the discharging switch K6 of the third switch unit S3, so that a conduction circuit is formed between the L5 end and the L6 end of the third switch unit S3. At the same time, the charging control end CO2 turns on the charging switch K7 of the fourth switch unit S4, and the discharging control end DO2 turns on the discharging switch K8 of the fourth switch unit S4, so that a conduction circuit is formed between the L7 end and the L8 end of the fourth switch unit S4.

[0198] The second controller U2 samples the third voltage value between the first positive conductive member and the first negative conductive member of the battery cell through the current limiting resistor RV5, and samples the fourth voltage value between the second positive conductive member and the second negative conductive member of the battery cell through the current limiting resistor RV6, to obtain the second voltage average of the third voltage value and the fourth voltage value.

[0199] The second controller also detects the second total current value flowing through the current sampling resistor RS1 and the current sampling resistor RS2. The second controller U2, the third switch unit S3, the fourth switch unit S4, the current sampling resistor RS1, the current sampling resistor RS2, the current limiting resistor RV5, the current limiting resistor RV6, the current limiting resistor RV7, the current limiting resistor RV8, and the filter capacitor C2 constitute the second protection circuit.

[0200] When the first switch unit S1, the second switch unit S2, the third switch unit S3 and the fourth switch unit S4 are all turned on, the first protection circuit from the first connection end to the battery cell and the second protection circuit from the second connection end to the battery cell are fully connected, and the battery can freely supply power to electronic devices, or the charger can freely charge the battery through electronic devices.

[0201] Implementation Method 2

[0202] Reference Figure 4 ,as well as Figure 7 and Figure 8 The circuit board can also include a fuel gauge unit U3, which includes a current-limiting resistor RV9, a current-limiting resistor RV10, a temperature-sensing resistor NTC, a filter capacitor C3, a current sampling terminal SRN, a current sampling terminal SRP, a communication terminal SCL, and a communication terminal SDA. The fuel gauge unit U3 may also include other components and pin definitions.

[0203] The power meter unit U3 samples the fifth voltage value between the first positive and first negative conductive parts of the battery cell through the current-limiting resistor RV9, and samples the sixth voltage value between the second positive and second negative conductive parts of the battery cell through the current-limiting resistor RV10. The average third voltage value of the fifth and sixth voltage values ​​is obtained for the system to make decisions and execute the corresponding charging strategy.

[0204] The fuel gauge unit U3 samples the third total current value flowing through the current sampling resistors RS1 and RS2 via the current sampling terminals SRN and SRP. This value is used for battery power measurement and to inform system decisions and the execution of corresponding charging strategies. The fuel gauge unit U3 also detects the actual temperature of the battery cell via the temperature sensing resistor NTC, which is used to inform system decisions and the execution of corresponding charging strategies.

[0205] Implementation Method 3

[0206] Reference Figure 4 ,as well as Figure 9 and Figure 10 The battery protection device may include an integrated unit of control unit and fuel gauge unit to realize the functional integration of control unit and fuel gauge unit, which will not be described in detail here.

[0207] When the first controller U1 in the first protection circuit reaches the corresponding protection threshold based on at least one of the sampled first average voltage value and first total current value, the first controller U1 controls the first switch unit S1 and the second switch unit S2 to shut down, so that the first protection circuit and the second protection circuit between the first connection terminal and the second connection terminal and the battery cell are cut off, thereby achieving the function of protecting the battery cell.

[0208] When the first voltage average and the first total current value both recover to within the protection threshold, the first controller U1 will open the first switch unit S1 and the second switch unit S2 again, and the circuit from the first connection end and the second connection end to the battery cell is opened again.

[0209] When the second voltage average and the second total current value both recover to within the protection threshold, the second controller U2 will open the third switch unit S3 and the fourth switch unit S4 again, and the first protection circuit and the second protection circuit from the first connection end and the second connection end to the battery cell are opened again.

[0210] When the second voltage average and the second total current value both recover to within the protection threshold, the second controller U2 will open the third switch unit S3 and the fourth switch unit S4 again, and the first protection circuit and the second protection circuit from the first connection end and the second connection end to the battery cell are opened again.

[0211] The first protection circuit and the second protection circuit are two independent protection circuits, both having overvoltage protection, undervoltage protection, charging overcurrent protection, discharging overcurrent protection, short circuit protection and other functions, and protecting the battery cell at the same time. When one of the protection circuits fails, the other protection circuit protects the battery cell. In logic, the overvoltage protection threshold of the first protection circuit should be higher than that of the second protection circuit, and the undervoltage protection threshold of the first protection circuit should be lower than that of the second protection circuit.

[0212] In the first protection circuit, the first controller U1 is a protection IC with high-voltage drive capability, the VD1 end is the working power supply input end of the first controller U1, and the V+1 and VR1 ends are used as the current sampling signal end of the first controller U1.

[0213] When the sampling assembly has current flowing through it, the first controller U1 determines whether the current reaches the protection threshold by the voltage drop between the two ends of the sampling assembly. The current-limiting resistors RV3 and RV4 are the protection resistors of the first controller U1, which limit the current flowing through the first controller U1 when the battery cell is reversely charged.

[0214] The VD1 end and the VSS1 end are used as the battery voltage sampling signal end of the first controller U1, and the VSS1 end is also the zero potential point of the first controller U1. The current-limiting resistor RV1 is connected between the first positive conductive part and the VD1 end of the first controller U1, and is used for sampling the first voltage value between the first positive conductive part and the first negative conductive part. The current-limiting resistor RV2 is connected between the second positive conductive part and the VD1 end of the first controller U1, and is used for sampling the second voltage value between the second positive conductive part and the second negative conductive part, so as to obtain the first voltage average.

[0215] When the first voltage average reaches the over-voltage protection threshold, the charge control end CO1 of the first controller U1 changes from high level to low level, the charge switch K1 of the first switch unit and the charge switch K3 of the second switch unit are turned off, and charging cannot be performed, so as to protect the battery cell from over-charging.

[0216] When the first voltage average reaches the under-voltage protection threshold, the discharge control end DO1 of the first controller U1 changes from high level to low level, the discharge switch K2 of the first switch unit and the discharge switch K4 of the second switch unit are turned off, and discharging cannot be performed, so as to protect the battery cell from over-discharging.

[0217] In the second protection circuit, the second controller U2 is a protection IC with high-end voltage driving capability, the VD2 end is the working power input end of the second controller U2, and the V+2 and VR2 ends are used as the current sampling signal ends of the second controller U2.

[0218] When the sampling component has current flowing therethrough, the second controller U2 judges whether the current reaches the protection threshold according to the voltage drop between the two ends of the sampling component, the current-limiting resistor RV7 and the current-limiting resistor RV8 are the protection resistors of the second controller U2, and the current flowing through the second controller U2 is limited when reverse charging occurs.

[0219] The VD2 end and the VSS2 end are used as the battery cell voltage sampling signal ends of the second controller U2, and the VSS2 end is also the zero potential point of the second controller U2, the current-limiting resistor RV5 is connected between the first positive electrode conductive member and the VD2 end of the second controller U2, and is used for sampling the third voltage value between the first positive electrode conductive member and the first negative electrode conductive member, and the current-limiting resistor RV6 is connected between the second positive electrode conductive member and the VD2 end of the second controller U2, and is used for sampling the fourth voltage value between the second positive electrode conductive member and the second negative electrode conductive member, so as to obtain the second voltage average.

[0220] When the second voltage average reaches the over-voltage protection threshold, the charge control end CO2 of the second controller U2 changes from high level to low level, the charge switch K5 of the third switch unit and the charge switch K7 of the fourth switch unit are turned off, and charging cannot be performed, so as to protect the battery cell from over-charging.

[0221] When the second voltage average reaches the under-voltage protection threshold, the discharge control end DO2 of the second controller U2 changes from high level to low level, the discharge switch K6 of the third switch unit and the discharge switch K8 of the fourth switch unit are turned off, and discharging cannot be performed, so as to protect the battery cell from over-discharging.

[0222] Referring to Figures 2-4 , and Figure 11 The embodiment of the application further provides a battery, which comprises a first battery cell 400 and the battery protection device described in any of the above embodiments.

[0223] The first electrode assembly can be disposed in the accommodating cavity of the shell, so that the shell can play a certain supporting and protecting role on the first electrode assembly.

[0224] The first electrode assembly can include two positive electrode assemblies and one negative electrode assembly. The two positive electrode assemblies are respectively electrically connected with the first positive electrode conductive member and the second positive electrode conductive member. The negative electrode assembly is electrically connected with the first negative electrode conductive member and the second negative electrode conductive member.

[0225] The first electrode assembly can include two positive electrode assemblies and one negative electrode assembly. The two positive electrode assemblies are respectively electrically connected with the first positive electrode conductive member and the second positive electrode conductive member. The negative electrode assembly is electrically connected with the first negative electrode conductive member and the second negative electrode conductive member.

[0226] The first electrode assembly can include two positive electrode assemblies and one negative electrode assembly. The two positive electrode assemblies are respectively electrically connected with the first positive electrode conductive member and the second positive electrode conductive member. The negative electrode assembly is electrically connected with the first negative electrode conductive member and the second negative electrode conductive member.

[0227] It should be noted that the central axis of the first electrode assembly can be determined according to the overall shape of the first electrode assembly, and the extension direction of the central axis of the first electrode assembly can be perpendicular to the first direction. The central axis of the first electrode assembly can be set as the symmetry axis of the first electrode assembly.

[0228] Alternatively, the central axis of the first electrode assembly can be determined according to the overall shape of the first electrode assembly, and the central axis of the first electrode assembly can be set as the symmetry axis of the first electrode assembly.

[0229] The first positive electrode conductive member 410 can be electrically connected with the first positive electrode end 111, and the first negative electrode conductive member 420 can be electrically connected with the first negative electrode end 112. The second positive electrode conductive member 430 can be electrically connected with the second positive electrode end 113, and the second negative electrode conductive member 440 can be electrically connected with the second negative electrode end 114.

[0230] In some possible embodiments, the battery can further be provided with a first rivet 450, and the first positive electrode conductive member 410 is electrically connected with the first positive electrode end 111 through the first rivet 450. The battery can further be provided with a second rivet 460, and the second positive electrode conductive member 430 is electrically connected with the second positive electrode end 113 through the second rivet 460.

[0231] The first electrode assembly can include two positive electrode assemblies and one negative electrode assembly. The two positive electrode assemblies are respectively electrically connected with the first positive electrode conductive member and the second positive electrode conductive member. The negative electrode assembly is electrically connected with the first negative electrode conductive member and the second negative electrode conductive member.

[0232] The first battery cell 400 comprises a steel shell housing or other metal shell and a cover plate 470. The metal shell has an inner cavity (not shown in the figure) and a first opening (not shown in the figure) communicating with the inner cavity. The pole core assembly is arranged in the inner cavity of the metal shell. The cover plate 470 is made of steel or other metal. The cover plate 470 covers the first opening of the metal shell to accommodate the pole core assembly in the sealed space formed by the metal shell and the cover plate 470.

[0233] The cover plate 470 can be welded on the first opening of the metal shell by welding. It can be understood that the cover plate 470 can also be arranged on the first opening of the metal shell by other means.

[0234] The first rivet 450 and the second rivet 460 can be arranged on and insulated from the cover plate 470.

[0235] The first rivet 450, the second rivet 460 and the cover plate 470 can be insulated and sealed by arranging an insulating member 473 to achieve the insulation and sealing design between the first rivet 450, the second rivet 460 and the cover plate 470 through the insulating member 473.

[0236] For example, the cover plate 470 further comprises a liquid injection hole 471 penetrating the cover plate 470, which is used to add electrolyte to the inner cavity of the first battery cell 400. The position of the liquid injection hole 471 is not limited and can be arranged according to actual needs.

[0237] The cover plate 470 can also be provided with a rubber rivet 472. The rubber rivet 472 is used to plug and seal the liquid injection hole 471 after liquid injection, cover the liquid injection hole 471 and connect to seal the liquid injection hole 471, which is used to prevent electrolyte leakage.

[0238] The embodiments of the present application also provide an electronic device comprising the battery of any one of the above and an electronic device body for accommodating the battery.

[0239] When the battery is fixed in the electronic device body, the first connecting end and the second connecting end are used to be electrically connected with corresponding ports in the electronic device body, respectively.

[0240] Since the electronic device comprises the battery of any one of the above, the electronic device comprises the advantages of the battery of any one of the above, and specific details can be referred to the above related description, which will not be repeated here.

[0241] In the description of the application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0242] In the description of the application, it should be understood that the terms "include" and "have" and any variations thereof used herein are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units need not be limited to those clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0243] Unless otherwise clearly specified and limited, the terms "mount", "connect", "connect", "fix" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or become an integral part; can be directly connected, or indirectly connected through an intermediate medium, can make the internal connection of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated.

[0244] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application.

Claims

1. A battery protection device, characterized in that, include: A first conductive path, the first conductive path being adapted for the charging and discharging process of the battery cell; the first conductive path includes a first switching assembly, a first positive terminal, a first negative terminal, and a first connection terminal; The first positive terminal and the first negative terminal are respectively connected to the first connection terminal; the first positive terminal is connected to the first connection terminal through the first switch assembly, and the first positive terminal and the first negative terminal are adapted to be connected to the battery cell; The second conductive path is adapted to the charging and discharging process of the battery cell; the second conductive path includes a second switching assembly, a second positive terminal, a second negative terminal, and a second connection terminal; the second positive terminal and the second negative terminal are respectively connected to the second connection terminal; the second positive terminal is connected to the second connection terminal through the second switching assembly, and the second positive terminal and the second negative terminal are adapted to be connected to the battery cell.

2. The battery protection device according to claim 1, characterized in that, The first switching assembly includes a first switching unit and a third switching unit. The first switch unit and the third switch unit are connected in series between the first positive terminal and the first connection terminal; The second switching assembly includes a second switching unit and a fourth switching unit; The second switch unit and the fourth switch unit are connected in series between the second positive terminal and the second connection terminal.

3. The battery protection device according to claim 1, characterized in that, The battery protection device also includes a control unit, which is used to control the first switching assembly and the second switching assembly to be turned on or off.

4. The battery protection device according to any one of claims 1-3, characterized in that, The battery protection device further includes a sampling component located in the first conductive path and / or the second conductive path.

5. The battery protection device according to claim 4, characterized in that, The sampling component is connected between the first connection terminal and the first switch component; The sampling component is connected between the second connection terminal and the second switch component.

6. The battery protection device according to claim 5, characterized in that, The first conductive path and the second conductive path share the sampling component.

7. The battery protection device according to claim 4, characterized in that, The sampling component includes a current sampling unit, which is adapted to acquire the current value of the first conductive path and / or the second conductive path.

8. The battery protection device according to claim 4, characterized in that, The battery protection device includes a control unit electrically connected to the control terminal of the first switching assembly to control the opening and closing of the first conductive path; and / or, The control unit is electrically connected to the control terminal of the second switching assembly to control the opening and closing of the second conductive path.

9. The battery protection device according to claim 8, characterized in that, The control unit includes a first control unit and a second control unit; The first control unit is connected to the sampling component in the first conductive path, and the first control unit is connected to the sampling component in the second conductive path; The second control unit is electrically connected to the sampling component in the first conductive path, and the second control unit is electrically connected to the sampling component in the second conductive path.

10. The battery protection device according to claim 1, characterized in that, The first conductive path and the second conductive path are independent of each other.

11. The battery protection device according to claim 4, characterized in that, The sampling component includes a first sampling component and a second sampling component; the first sampling component is disposed in the first conductive path, and the second sampling component is disposed in the second conductive path, and the first conductive path and the second conductive path operate independently of each other.

12. The battery protection device according to claim 4, characterized in that, The first conductive path and the second conductive path share the sampling component, and the first conductive path and the second conductive path only have overlapping circuits at the sampling component.

13. The battery protection device according to claim 1, characterized in that, The battery protection device includes a connector and a circuit board; The first positive terminal, the first negative terminal, the second positive terminal, and the second negative terminal are disposed on the circuit board; The first connecting end and the second connecting end are disposed on the connecting part.

14. The battery protection device according to claim 13, characterized in that, The battery protection device includes a control unit; The first switch assembly, the second switch assembly, and the control unit are all mounted on the circuit board.

15. The battery protection device according to claim 13, characterized in that, The connection part includes a circuit structure, and the first connection end and the second connection end are electrically connected to the circuit board through the circuit structure.

16. The battery protection device according to claim 13, characterized in that, The connecting portion includes a first connecting portion and a second connecting portion, wherein the first connecting end is disposed in the first connecting portion and the second connecting end is disposed in the second connecting portion.

17. The battery protection device according to claim 16, characterized in that, The first connection portion includes a first circuit structure and a first connection terminal disposed on the first circuit structure, the first connection terminal being electrically connected to the circuit board through the first circuit structure; and / or, The second connection portion includes a second circuit structure and a second connection end disposed on the second circuit structure. The second connection end is electrically connected to the circuit board through the second circuit structure.

18. The battery protection device according to any one of claims 13-17, characterized in that, The circuit board extends along a first direction, and the connecting portion extends along a second direction, wherein, along the second direction, a first end of the connecting portion is connected to the circuit board, and the first direction and the second direction are perpendicular.

19. The battery protection device according to claim 18, characterized in that, The first connecting end and the second connecting end are arranged opposite each other along the first direction; In the first direction, the distance between the first connection end and the second connection end is less than or equal to the length of the circuit board.

20. The battery protection device according to claim 18, characterized in that, The connecting portion is located at the middle of the circuit board along the first direction.

21. The battery protection device according to claim 18, characterized in that, The circuit board includes a first surface and a second surface that are opposite to each other along the thickness direction; The first positive terminal, the first negative terminal, the second negative terminal, and the second positive terminal are disposed on the first surface of the circuit board.

22. The battery protection device according to claim 21, characterized in that, The battery protection device includes a control unit; The first switch assembly, the second switch assembly, and the control unit are disposed on the second surface of the circuit board.

23. The battery protection device according to claim 18, characterized in that, Along the first direction, the first positive terminal, the first negative terminal, the second negative terminal, and the second positive terminal are sequentially disposed on the first surface of the circuit board.

24. The battery protection device according to claim 18, characterized in that, There is a reference axis between the first connecting end and the second connecting end; the first positive end and the second positive end are respectively disposed on both sides of the reference axis, and the first negative end and the second negative end are respectively disposed on both sides of the reference axis.

25. The battery protection device according to claim 24, characterized in that, In the first direction, the first connection terminal is closer to the first positive terminal and the first negative terminal than the second connection terminal; in the first direction, the second connection terminal is closer to the second positive terminal and the second negative terminal than the first connection terminal.

26. The battery protection device according to claim 25, characterized in that, The first conductive path and the second conductive path are located on both sides of the reference axis, respectively.

27. The battery protection device according to claim 26, characterized in that, The first switch assembly and the second switch assembly are symmetrically arranged along the reference axis; The battery protection device further includes a first control unit and a second control unit, which are symmetrically arranged along the reference axis. The first positive terminal and the second positive terminal are symmetrically arranged along the reference axis; The first negative terminal and the second negative terminal are symmetrically arranged along the reference axis.

28. The battery protection device according to claim 26, characterized in that, The first conductive path and the second conductive path are symmetrical about the reference axis.

29. The battery protection device according to claim 24, characterized in that, In the first direction, the second connection terminal is closer to the first positive terminal and the first negative terminal than the first connection terminal; in the first direction, the first connection terminal is closer to the second positive terminal and the second negative terminal than the second connection terminal.

30. The battery protection device according to claim 13, characterized in that, The first negative terminal and the first connection terminal are arranged opposite each other in the second direction, and the second negative terminal and the second connection terminal are arranged opposite each other in the second direction.

31. The battery protection device according to claim 14, characterized in that, The battery protection device includes a sampling component, which is disposed in the first conductive path and the second conductive path; The first switching assembly, the sampling assembly, and the second switching assembly are sequentially disposed on the circuit board along a first direction; and / or, At least one of the first connection terminal and the second connection terminal is disposed opposite to the sampling component along the second direction; and / or, In the first direction, the sampling component is located between the first switching component and the second switching component; The first direction and the second direction are perpendicular.

32. The battery protection device according to claim 13, characterized in that, The circuit board and the connection part are located in the same plane.

33. A battery, characterized in that, It includes a first battery cell and a battery protection device as described in any one of claims 1-32, wherein the first battery cell and the battery protection device are electrically connected.

34. The battery according to claim 33, characterized in that, The first battery cell is provided with a first positive conductive element, a first negative conductive element, a second negative conductive element, and a second positive conductive element; The first positive electrode conductive element is electrically connected to the first positive terminal, and the first negative electrode conductive element is electrically connected to the first negative terminal; The second positive conductive element is electrically connected to the second positive terminal, and the second negative conductive element is electrically connected to the second negative terminal.

35. The battery according to claim 34, characterized in that, The first positive conductive element, the first negative conductive element, the second negative conductive element, and the second positive conductive element are arranged alternately in sequence.

36. The battery according to claim 34, characterized in that, The battery is also provided with a first rivet and a second rivet. The first positive conductive element is electrically connected to the first positive terminal via the first rivet, and the second positive conductive element is electrically connected to the second positive terminal via the second rivet.

37. The battery according to claim 33, characterized in that, The first battery cell is configured as a steel-cased battery cell.

38. The battery according to claim 33, characterized in that, The first battery cell includes a first electrode assembly and a housing, the housing being adapted to form a receiving cavity, and the electrode assembly being placed within the receiving cavity; the electrode assembly includes two positive electrode assemblies and one negative electrode assembly; The two positive electrode components are respectively electrically connected to the first positive electrode conductive element and the second positive electrode conductive element; The negative electrode assembly is electrically connected to the first negative electrode conductive element and the second negative electrode conductive element.

39. The battery according to claim 33, characterized in that, The first cell has a central axis, and the first connecting end and the second connecting end are symmetrically arranged along the central axis.

40. The battery according to claim 33 or 39, characterized in that, The first cell has a central axis, and the first positive terminal and the second positive terminal are symmetrically arranged along the central axis; the first negative terminal and the second negative terminal are symmetrically arranged along the central axis.

41. An electronic device, characterized in that, Includes the battery as described in any one of claims 33-40, and an electronic device body for housing the battery; When the battery is fixed inside the electronic device, the first connection end and the second connection end are used to electrically connect to corresponding ports inside the electronic device body, respectively.

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