Battery protection board, battery assembly and electric equipment

Abstract

The utility model relates to a battery protection board, a battery assembly and electric equipment, and relates to the technical field of energy storage. Wherein the chip comprises a plurality of pins; the bonding pad groups are suitable for being connected with the chip and the battery cell; the first connecting piece is connected with the at least two bonding pad groups, and the first connecting piece is suitable for enabling the two bonding pad groups to be short-circuited or disconnected; and the second connecting piece is connected between the two pins, and the second connecting piece is suitable for enabling the two pins to be in coupling connection, short circuit or disconnection. Therefore, the connection relationship between each bonding pad and the chip in the battery protection board and the connection relationship between the chip pins can be configured according to the actual number of the battery cells in the battery pack, so that the same battery protection board can be configured with different numbers of battery cells without redesigning the circuit or replacing the chip, and the battery protection board is convenient to use. Therefore, the development cost is reduced, and the expansibility of the battery protection board is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery protection board, a battery assembly, and an electrical device. Background Art

[0002] As the core component of energy storage and conversion, batteries have been widely used in various portable devices, electric vehicles, large-scale energy storage systems and other fields.

[0003] Currently, to ensure the safety of battery packs during charging and discharging and accurately detect the remaining power, the battery management system will accurately collect the operating data of each battery cell in the battery pack. Usually, during the circuit board manufacturing process, a specific chip will be connected to the positive and negative poles of each battery cell in the battery pack to realize the collection of operating data of each battery cell.

[0004] However, by connecting the chip to the positive and negative poles of each battery cell, when the number of batteries connected in series in the battery pack changes, since the connection between the chip and the battery cell has been fixed during the circuit board design stage, the circuit board must be redesigned to adapt to the new battery number configuration, making the battery pack less scalable. Summary of the Invention

[0005] An embodiment of the present application provides a battery protection board, which improves the scalability of the battery pack and at least partially solves the above-mentioned technical problems.

[0006] In order to achieve the above objectives, according to a first aspect of the present application, a battery protection board is provided, comprising:

[0007] A chip, including several pins;

[0008] A plurality of pad groups, wherein the pad groups are suitable for connecting chips and battery cells;

[0009] a first connector connected to at least two of the pad groups, wherein the first connector is adapted to short-circuit or disconnect the two pad groups;

[0010] A second connecting member is connected between the two pins, and the second connecting member is suitable for short-circuiting, disconnecting or coupling the two pins.

[0011] In some embodiments, a third connector is further included, wherein the third connector is connected between the pad group and the pin to disconnect or connect the pad group and the pin.

[0012] In some embodiments, the first connection member includes at least one first switch;

[0013] The first switches are respectively connected to at least two of the pad groups, and are adapted to short-circuit the at least two pad groups.

[0014] In some embodiments, the first connecting member includes at least one first adapter;

[0015] The first adapter is disposed on at least two of the pad groups and is suitable for short-circuiting the at least two pad groups.

[0016] In some embodiments, the invention further comprises a first resistor connected in series between the pin and the pad group;

[0017] The third connection member includes at least one series switch, and the series switch is connected in series with the first resistor.

[0018] In some embodiments, the third connection member includes a plurality of first reserved pads, and the first reserved pads are respectively connected to the pins and the pad group.

[0019] In some embodiments, the battery protection board includes a second resistor, and at least one second resistor is disposed on the first reserved pad to establish a connection between the pin and the pad group.

[0020] In some embodiments, a first capacitor is further provided in parallel between the two pins; the second connector includes at least one parallel switch, and the parallel switch is provided in parallel with the first capacitor.

[0021] In some embodiments, the second connecting member includes a second reserved pad;

[0022] The second reserved pads are connected to the two pins respectively.

[0023] In certain embodiments, the second connector includes a second capacitor;

[0024] The second capacitor is suitable for being arranged on the second reserved pad to couple the two pins.

[0025] In some embodiments, the second connection member includes a third resistor;

[0026] The third resistor is mounted on the second reserved pad and is suitable for short-circuiting the two pins.

[0027] In some embodiments, the third resistor is a 0 ohm resistor.

[0028] In some embodiments, each of the pad groups is insulated from each other, and each of the pad groups includes one or more sub-pads; the sub-pads are suitable for connecting to the pins and / or battery cells of the chip.

[0029] In certain embodiments, the battery protection board further includes a conductor sheet adapted to electrically connect the sub-pads in each of the pad groups.

[0030] In some embodiments, the chip is in plurality, and the chip is suitable for connecting pads.

[0031] According to a second aspect of the present application, a battery assembly is provided, comprising a battery cell and the battery protection board as described above, wherein the battery cell and the battery protection board are electrically connected.

[0032] In some embodiments, the battery assembly further includes a second adapter, one side of the second adapter is connected to the pad group, and the other side is connected to the battery cell, and the second adapter is suitable for electrically connecting the battery cell and the battery protection board.

[0033] According to a third aspect of the present application, there is provided an electrical device comprising the battery assembly as described above.

[0034] In the battery protection board of the embodiment of the present application, a first connector is provided to connect the pad group where no battery cells are required. This allows the remaining cells to continue to operate normally without short circuits even when the cells are removed, thereby enabling the number of battery cells in the battery pack to be configured according to actual needs. A second connector is provided to configure the connection relationship between chip pins according to the actual number of battery cells in the battery pack. This allows the same battery protection board to be configured with different numbers of battery cells without redesigning the circuit or replacing the chip, thereby reducing development costs and improving the scalability of the battery protection board.

[0035] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0037] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0038] Figure 1 is a schematic diagram of a battery pack including four battery cells in the related art;

[0039] Figure 2is a schematic diagram of a battery pack including three battery cells in the related art;

[0040] Figure 3 is a schematic diagram of a battery pack including two battery cells in the related art;

[0041] Figure 4 is a circuit connection diagram of a battery protection board provided in an exemplary embodiment of the present disclosure;

[0042] Figure 5 is a circuit connection diagram of another battery protection board provided in an exemplary embodiment of the present disclosure;

[0043] Figure 6 is a schematic diagram of a pad group provided in an exemplary embodiment of the present disclosure;

[0044] Figure 7 is a schematic diagram of a sub-pad provided in an exemplary embodiment of the present disclosure;

[0045] Figure 8 This is a schematic diagram of the assembly of a battery protection board in the related art;

[0046] Figure 9 is a schematic diagram of the assembly of a battery protection board provided in an exemplary embodiment of the present disclosure;

[0047] Figure 10 is a connection diagram of a first metal adapter sheet provided in an exemplary embodiment of the present disclosure;

[0048] Figure 11 is a connection diagram of a second metal adapter provided in an exemplary embodiment of the present disclosure;

[0049] Figure 12 is a schematic diagram of a first transfer belt provided in an exemplary embodiment of the present disclosure;

[0050] Figure 13 is a schematic diagram of a second transfer belt provided in an exemplary embodiment of the present disclosure.

[0051] Explanation of the accompanying drawings: 311, first adapter; 321, first reserved pad; 331, second reserved pad; 41, first pad group; 411, first sub-pad; 412, second sub-pad; 413, third sub-pad; 414, fourth sub-pad; 415, fifth sub-pad; 42, second pad group; 43, third pad group; 44, fourth pad; 45, fifth pad group; 46, sixth pad; 47, seventh pad; 49, first metal adapter; 410, second metal adapter; 5, first adapter tape; 51, first welding area; 52, first metal connection area; 53, second welding area; 6, second adapter tape; 61, third welding area; 62, second metal connection area; 63, fourth welding area. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0053] First, based on the content of the background technology of this application, the background of this application is further explained. Figures 1 to 2 , Figure 1 This is a schematic diagram of the connection between a battery pack obtained by connecting four battery cells in series and a chip (such as a protection IC or a fuel gauge in the figure). As an example, each chip includes at least four pins, and each pin is connected to the positive electrode of the battery cell through a series resistor. Figure 2 , Figure 2 This is a schematic diagram of the connection between the battery pack and the chip, which is obtained by connecting three cells in series. When the battery pack contains three cells, the chip only needs three pins to connect to the corresponding cells. In this case, the other pin of the chip needs to be short-circuited to the adjacent pin. Figure 3 , Figure 3 This is a schematic diagram of the connection between a battery pack and a chip, resulting from two cells connected in series. Similarly, when a battery pack contains two cells, the chip only needs two pins to connect to the corresponding cells, and the other two pins of the chip need to be short-circuited to adjacent pins. Therefore, when the number of cells in the battery pack changes, the connection relationship between the chip and the cells needs to be changed simultaneously, resulting in the need for circuit redesign and reconnection, increasing development costs and development time.

[0054] In some embodiments, a first connector is provided to connect the pad groups where battery cells are not required, so that when the battery cells are removed, the remaining ones can still work normally without short circuit, thereby realizing the configuration of the number of battery cells in the battery pack according to actual needs; and a second connector is provided to configure the connection relationship between the chip pins according to the actual number of battery cells in the battery pack.

[0055] Each pin of the chip is usually connected in series with a protective resistor to limit the current and divide the voltage of the signal flowing to the chip pins, thereby preventing high voltage or high current from flowing directly to the chip pins and causing damage to the chip. Therefore, to avoid damage to the chip, a third connector is also provided on the battery protection board.

[0056] Based on this, according to the first aspect of the present application, the present disclosure provides a battery protection board, including a chip, several pad groups, a first connector and a second connector, the chip includes several pins; several pad groups, the pad groups are suitable for connecting battery cells and chip pins; a first connector, connected to at least two pad groups, the first connector is suitable for short-circuiting or disconnecting the two pad groups; the second connector is connected between the two pins, the second connector is suitable for short-circuiting or disconnecting the two pins.

[0057] As an example, the chip can be a protection IC and / or a fuel gauge. The protection IC is used to protect the battery cells from overcharging, over-discharging, short circuit, etc. The protection IC collects the voltage of each battery cell in the battery pack to ensure that each battery cell is not damaged by overcharging or over-discharging. The fuel gauge is used to estimate the remaining capacity (SOC, State of Charge) or remaining usage time of the battery cell. The fuel gauge usually collects information such as the voltage and current of each battery cell to calculate the overall power of the battery pack composed of the battery cells.

[0058] In the above embodiment, through the cooperation of the first connector, the third connector and the second connector, the connection relationship between each pad in the battery protection board and the chip, as well as the connection relationship between the chip pins can be configured according to the actual number of battery cells in the battery pack, so that the same battery protection board can be configured with different numbers of battery cells without redesigning the circuit or replacing the chip, thereby reducing development costs and improving the scalability of the battery protection board.

[0059] In some embodiments, each pad group is insulated from each other, and each pad group includes one or more sub-pads; the sub-pads are suitable for being electrically connected to pins and / or battery cells of the chip.

[0060] In some embodiments, there are multiple battery cells.

[0061] In some embodiments, the battery protection board further includes a conductor sheet adapted to electrically connect the sub-pads in each pad group.

[0062] Example 1

[0063] In some embodiments, the first connecting member includes at least one first switch; the first switch is respectively connected to at least two pad groups and is suitable for disconnecting or short-circuiting the at least two pad groups.

[0064] As an example, the first switch may include a first control switch S11 and a second control switch S21. If a battery pack including three cells is required, the first control switch S11 is closed and the fourth cell B41 is removed. The equivalent circuit diagram can be referred to Figure 2 If a battery pack including two cells is required, the first control switch S11 and the second control switch S21 are closed at the same time, and the third cell B31 and the fourth cell B41 are removed. The equivalent circuit diagram can be found in Figure 3 .

[0065] In the above embodiment, the first switch is used to short-circuit the pad group to enable conduction between the pad groups without setting up battery cells, acting as a conductor, so that the circuit can still be normally conducted after unnecessary battery cells are removed, thereby reducing the number of battery cells in the battery pack.

[0066] In some embodiments, the battery protection board further includes a first resistor arranged in series between the pin and the pad group; the third connecting member includes at least one series switch, and the series switch is arranged in series with the first resistor.

[0067] Combine Figure 4As an example, taking the battery pack including four battery cells and the chip being a protection IC as an example, the first resistor includes a first series resistor R11, a second series resistor R21, a third series resistor R31 and a fourth series resistor R41. The first series resistor R11 is connected in series between the positive electrode connection terminal of the fourth battery cell B41 and the pin VC4 of the protection IC, the second series resistor R21 is connected in series between the positive electrode connection terminal of the third battery cell B31 and the pin VC3 of the protection IC, the third series resistor R31 is connected in series between the positive electrode connection terminal of the second battery cell B21 and the pin VC2 of the protection IC, and the fourth series resistor R41 is connected in series between the positive electrode connection terminal of the first battery cell B11 and the pin VC1 of the protection IC. Taking the battery pack including four battery cells and the chip being a fuel meter as an example, the first resistor includes a fifth series resistor R51, a sixth series resistor R61, a seventh series resistor R71 and an eighth series resistor R81. The fifth series resistor R51 is connected in series between the positive connection terminal of the fourth battery cell B41 and the pin VC4 of the fuel meter, the sixth series resistor R61 is connected in series between the positive connection terminal of the third battery cell B31 and the pin VC3 of the fuel meter, the seventh series resistor R71 is connected in series between the positive connection terminal of the second battery cell B21 and the pin VC2 of the fuel meter, and the eighth series resistor R81 is connected in series between the positive connection terminal of the first battery cell B11 and the pin VC1 of the fuel meter.

[0068] Continue to refer to Figure 4 Taking the chip as a protection IC as an example, the series switches may include a first series switch S3 and a second series switch S5. The first series switch S3 is connected in series with the second series resistor R21, and the second series switch S5 is connected in series with the third series resistor R31. When a battery pack including three cells is required, the first series switch S3 is controlled to be disconnected, so that the second series resistor R21 is disconnected from the pin VC3 of the protection IC. The equivalent circuit diagram can be referred to Figure 2 When a battery pack including two cells is required, the first series switch S3 and the second series switch S5 are controlled to be disconnected, so that the second series resistor R21 and the third series resistor R31 are disconnected from the pins VC3 and VC2 of the protection IC respectively. The equivalent circuit diagram can be referred to Figure 3 Taking the chip as an example of a fuel gauge, the series switches may include a third series switch S7 and a fourth series switch S9. The third series switch S7 is connected in series with the sixth series resistor R61, and the fourth series switch S9 is connected in series with the seventh series resistor R71. When a battery pack including three cells is required, the third series switch S7 is controlled to be disconnected. The equivalent circuit diagram can be referred to Figure 2 When a battery pack including two cells is required, the third series switch S7 and the fourth series switch S9 are controlled to be disconnected. The equivalent circuit diagram can be referred to Figure 3 .

[0069] In some embodiments, the battery protection board further includes a first capacitor connected in parallel between the two pins; the second connector includes at least one parallel switch connected in parallel with the first capacitor. The capacitor can absorb noise and interference in the circuit to improve the accuracy of the cell voltage acquisition by the chip.

[0070] Combine Figure 4 Taking the chip as a protection IC, which includes four pins VC1, VC2, VC3 and VC4 as an example, the first capacitor includes a first parallel capacitor C11, a second parallel capacitor C21, a third parallel capacitor C31 and a fourth parallel capacitor C41; the first parallel capacitor C11 is connected in parallel between the pins VC3 and VC4 of the protection IC, the second parallel capacitor C21 is connected in parallel between the pins VC2 and VC3 of the protection IC, the third parallel capacitor C31 is connected in parallel between the pins VC1 and VC2 of the protection IC, and the fourth parallel capacitor C41 is connected in parallel between the pin VC1 of the protection IC and ground. Taking the chip as an example, which is a fuel meter and includes four pins VC1, VC2, VC3 and VC4, the first capacitor includes a fifth parallel capacitor C51, a sixth parallel capacitor C61, a seventh parallel capacitor C71 and an eighth parallel capacitor C81; the fifth parallel capacitor C51 is connected in parallel between the pins VC3 and VC4 of the fuel meter, the sixth parallel capacitor C61 is connected in parallel between the pins VC2 and VC3 of the fuel meter, the seventh parallel capacitor C71 is connected in parallel between the pins VC1 and VC2 of the fuel meter, and the eighth parallel capacitor C81 is connected in parallel between the pin VC1 of the fuel meter and ground.

[0071] Continue to refer to Figure 4 Taking the chip as a protection IC as an example, the parallel switch may include a first parallel switch S4 and a second parallel switch S6. The first parallel switch S4 is connected in parallel with the first parallel capacitor C11, and the second parallel switch S6 is connected in parallel with the second parallel capacitor C21. When a battery pack including three cells is required, the first parallel switch S4 is controlled to be closed so that the pins on both sides of the first parallel capacitor C11 are short-circuited, that is, the pins VC3 and VC4 of the protection IC are short-circuited. The equivalent circuit diagram can be referred to Figure 2 When a battery pack including two cells is required, the first parallel switch S4 and the second parallel switch S6 are controlled to be closed, so that the pins on both sides of the first parallel capacitor C11 and the second parallel capacitor C21 are short-circuited, that is, the pins VC2, VC3 and VC4 of the protection IC are short-circuited. The equivalent circuit diagram can be referred to Figure 3Taking the fuel gauge as an example, the parallel switches may include a third parallel switch S8 and a fourth parallel switch S10. The third parallel switch S8 is connected in parallel with the fifth parallel capacitor C51, and the fourth parallel switch S10 is connected in parallel with the sixth parallel capacitor C61. When a battery pack including three cells is required, the third parallel switch S8 is controlled to be closed so that the pins on both sides of the fifth parallel capacitor C51 are short-circuited, that is, the pins VC3 and VC4 of the fuel gauge are short-circuited. The equivalent circuit diagram can be referred to Figure 2 When a battery pack including two cells is required, the third parallel switch S8 and the fourth parallel switch S10 are controlled to be closed, so that the pins on both sides of the fifth parallel capacitor C51 and the sixth parallel capacitor C61 are short-circuited, that is, the pins VC2, VC3 and VC4 of the fuel gauge are short-circuited. The equivalent circuit diagram can be referred to Figure 3 .

[0072] It should be noted that the parallel switches and series switches in this application can also be replaced by relays. Any components that can control the disconnection or connection of the corresponding circuit can be used as the parallel switches and series switches in this application, and there is no restriction here.

[0073] Example 2

[0074] In the above-mentioned embodiment 1, it is necessary to first set the first resistor and the first capacitor on the pad group, and then control the on and off of the first resistor and the first capacitor by the switching state of the first switch, the parallel switch, and the series switch, thereby respectively realizing the functions of the first connector, the third connector, and the second connector. The difference between embodiment 2 and embodiment 1 is that in embodiment 2, the functions of the first connector, the third connector, and the second connector are realized by selectively mounting corresponding components on the pad group or not mounting any components, without pre-setting the first resistor and the first capacitor, nor the need for pre-setting the switch device. The following is a detailed description of embodiment 2.

[0075] In some embodiments, the first connector includes at least one first transition member 311 ; the first transition member 311 is disposed on at least two pad groups and is adapted to short-circuit the at least two pad groups.

[0076] Reference Figure 5 , Figure 5 Removed Figure 4 The fourth cell B41 in the embodiment of the present invention is short-circuited by the first adapter 311 to connect the two pads of the fourth cell B41 to act as a conductor, which is equivalent to Figure 4 When the first control switch S11 is closed, the first adapter 311 can be set in size and shape according to actual needs to cover different numbers of pad groups.

[0077] Reference Figure 6As an example, taking the battery pack including four battery cells as an example, the pad group includes a first pad group 41, a second pad group 42, a third pad group 43, a fourth pad 44, a fifth pad group 45, a sixth pad 46 and a seventh pad 47.

[0078] Reference Figure 7 , wherein the first pad group 41 includes a first sub-pad 411, a second sub-pad 412, a third sub-pad 413, a fourth sub-pad 414 and a fifth sub-pad 415. As an example, the first sub-pad 411, the second sub-pad 412, the third sub-pad 413, the fourth sub-pad 414 and the fifth sub-pad 415 can be connected by a metal conductor set on the substrate, and any one or more sub-pads are connected to the negative electrode connection terminal of the first battery cell B11.

[0079] For example, combined with Figure 10 When a battery pack containing two cells is required, the first adapter 311 includes a first metal adapter plate 49. The bottom surface of the first metal adapter plate 49 is welded together with the fourth pad group 44, the sixth pad 46 and the seventh pad 47. By setting the first metal adapter plate 49, it is equivalent to closing the first control switch S11 and the second control switch S21. Figure 11 When a battery pack containing three cells is required, the first adapter 311 includes a second metal adapter plate 410, and the bottom surface of the second metal adapter plate 410 is welded together with the sixth welding pad 46 and the seventh welding pad 47, which is equivalent to closing the first control switch S11.

[0080] In some embodiments, the first connecting member may be a nickel sheet, and other connecting sheets that can achieve connection of the pad groups are also within the scope of protection of this application.

[0081] In some embodiments, the third connector includes a plurality of first reserved pads 321 , which are respectively connected to the pins and the pad group. The first reserved pads 321 are suitable for disconnecting or electrically connecting the pins and the pad group.

[0082] In some embodiments, the battery protection board includes a second resistor, and at least one second resistor is disposed on the first reserved pad 321 to establish an electrical connection between the pin and the pad group.

[0083] As an example, combined with Figure 5, the first reserved pad 321 includes H11~H81; when a battery pack containing three cells is required, in the mounting process, the first reserved pad H11, the third reserved pad H31, and the fourth reserved pad H41 connected in series with the pin VC3 of the protection IC can be mounted with a second resistor, and the fifth reserved pad H51, the first reserved pad H71, and the eighth reserved pad H81 connected in series with the pin VC3 of the fuel gauge can be mounted with a second resistor, and at the same time, the first reserved pad H21 connected in series with the pin VC3 of the protection IC can be left empty, and the sixth reserved pad H61 connected in series with the pin VC3 of the fuel gauge can be left empty to disconnect the pin of the chip and the positive connection end of the cell, and the implementation effect is equivalent to Figure 2 .

[0084] In some embodiments, the second connector includes a second reserved pad 331 ; the second reserved pad 331 is connected to the two pins respectively, and the second reserved pad 331 is suitable for being arranged between the two pins to couple or short-circuit the two pins.

[0085] As an example, the second connector includes a second capacitor, which is suitable for being mounted on the second reserved pad 331 to couple the two pins. The second connector includes a third resistor, which is mounted on the second reserved pad 331 and suitable for short-circuiting the two pins. The third resistor is a 0 ohm resistor. The third resistor can be mounted between adjacent pins of a chip without a capacitor through a mounting process, thereby short-circuiting the adjacent pins of the chip without a capacitor.

[0086] It should be noted that the third resistor may also be a wire or a resistor with a relatively low resistance, and any short circuit between the pins may be achieved, and no limitation is imposed here.

[0087] As an example, see Figure 5 , the second reserved pads 331 include H12 to H82. When a battery pack containing two cells is required, during the mounting process, the second reserved pads H12 and H22 can be attached to the third resistor, the second reserved pads H32 and H42 can be attached to the second capacitor, and at the same time, the second reserved pads H52 and H62 can be attached to the third resistor, and the second reserved pads H72 and H82 can be attached to the second capacitor, which has the same effect. Figure 3 .

[0088] It should be noted that the second resistor is a resistor with a certain resistance value, which is not specifically limited here.

[0089] According to a second aspect of the present application, a battery assembly is provided, comprising a battery cell and the battery protection board as described above, wherein the battery cell and the battery protection board are electrically connected.

[0090] As an example, a third connector is further included, one side of the third connector is connected to the pad group, and the other side is connected to the battery cell. The third connector is suitable for electrically connecting the battery cell and the battery protection board.

[0091] Reference Figure 9 In some embodiments, the battery protection board further includes a second adapter, one side of which is connected to any one or more sub-pads in the pad group, and the other side is connected to the positive terminal or negative terminal of the battery cell.

[0092] Combine Figure 8 , Figure 8 It is an assembly drawing of a battery protection board in the related art. In the related art, the position of the welding pad is fixed and cannot be moved as the position of the positive and negative poles of the battery cell changes. When the size of the battery cell changes, the battery protection board needs to be reassembled so that the positive pole of the battery cell is connected to the corresponding positive pole connection terminal, and the negative pole of the battery cell is connected to the corresponding negative pole connection terminal.

[0093] As an example, the second adapter 48 is welded to the corresponding sub-pads in the first pad group 41, the second pad group 42, the third pad group 43 and the fifth pad group 45 respectively. The length of the second adapter 48 is less than the total length of any pad group of the first pad group 41, the second pad group 42, the third pad group 43 and the fifth pad group 45. When the position of the positive or negative pole of the first battery cell B11 and the second battery cell B21 changes, the second adapter 48 is moved on the corresponding sub-pads in the first pad group 41, the second pad group 42, the third pad group 43 and the fifth pad group 45 to change the position of the positive connection terminal and the negative connection terminal of the battery cell connected to the sub-pad, so that when the position of the positive and negative poles of the battery cell moves, they can still be connected to their corresponding positive connection terminal and negative connection terminal respectively, thereby realizing the connection between the battery cells.

[0094] In some embodiments, the battery protection board further includes a transfer tape; the positive electrode of the battery cell and the negative electrode of the adjacent battery cell are connected via the transfer tape.

[0095] The adapter tape connects the positive electrode of the battery cell to the corresponding positive electrode connection terminal, and connects the negative electrode of the battery cell to the corresponding negative electrode connection terminal.

[0096] Reference Figure 12 and Figure 13As an example, the transfer tape includes a first transfer tape 5, a second transfer tape 6, a third transfer tape, and a fourth transfer tape. The first transfer tape 5 includes a first welding area 51, a first metal connection area 52, and a second welding area 53. The first welding area 51 and the second welding area 53 are connected via the first metal connection area 52. By welding the back surface of the first welding area 51 of the first transfer tape 5 to the fourth welding pad 44, the back surface of the second welding area 53 is welded to the negative electrode of the third battery cell B31, thereby connecting the negative electrode of the third battery cell B31 to its negative electrode connection terminal.

[0097] As an example, the second transfer tape 6 includes a third welding area 61, a second metal connection area 62, and a fourth welding area 63. The third welding area 61 and the fourth welding area 63 are connected via the second metal connection area 62. The back surface of the third welding area 61 of the second transfer tape 6 is welded to the metal transfer sheet 410, and the back surface of the fourth welding area 63 is welded to the positive electrode of the third battery cell B31, thereby connecting the positive electrode of the third battery cell B31 to its positive electrode connection terminal.

[0098] In the above embodiment, the third battery cell B31 is connected in series to the battery pack by connecting the positive electrode of the third battery cell B31 to its positive terminal via the first adapter tape 5, and connecting the negative electrode of the third battery cell B31 to its negative terminal via the second adapter tape 6. Based on the same connection principle, the fourth battery cell B41 can be connected in series to the battery pack via the third and fourth adapter tapes.

[0099] According to a third aspect of the present application, there is provided an electrical device comprising the battery assembly as described above.

[0100] The electrical device may be a laptop computer, a tablet computer, a mobile phone, a two-wheeled or three-wheeled vehicle, a fuel vehicle, a plug-in hybrid vehicle or a new energy vehicle, etc., and the present disclosure does not make any specific limitations on this.

[0101] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. It should also be noted that the descriptions of the back surface, bottom surface, etc. in this application are only for a clearer description of the technical solution of this application and do not constitute any specific limitation.

[0102] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0103] The embodiments, implementation methods and related technical features of the present application can be combined and replaced with each other without conflict.

[0104] The above are merely preferred embodiments of the present application and do not constitute any form of limitation to the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A battery protection board, characterized in that: include: A chip, including several pins; A plurality of pad groups, wherein the pad groups are suitable for connecting chips and battery cells; a first connector connected to at least two of the pad groups, wherein the first connector is adapted to short-circuit or disconnect the two pad groups; A second connecting member is connected between the two pins, and the second connecting member is suitable for short-circuiting, disconnecting or coupling the two pins.

2. The battery protection board according to claim 1, characterized in that: A third connecting member is further included, wherein the third connecting member is connected between the pad group and the pin to disconnect or connect the pad group and the pin.

3. The battery protection board according to claim 1, characterized in that: The first connecting member includes at least one first switch; The first switches are respectively connected to at least two of the pad groups, and are adapted to short-circuit or disconnect the at least two pad groups.

4. The battery protection board according to claim 1, characterized in that: The first connecting member includes at least one first adapter; The first adapter is disposed on at least two of the pad groups and is suitable for short-circuiting the at least two pad groups.

5. The battery protection board according to claim 2, characterized in that: Also included is a first resistor connected in series between the pin and the pad group; The third connection member includes at least one series switch, and the series switch is connected in series with the first resistor.

6. The battery protection board according to claim 2, characterized in that: The third connecting member includes a plurality of first reserved pads, and the first reserved pads are respectively connected to the pins and the pad group.

7. The battery protection board according to claim 6, characterized in that: The battery protection board includes a second resistor, and at least one second resistor is arranged on the first reserved pad to establish a connection between the pin and the pad group.

8. The battery protection board according to claim 1, characterized in that: It also includes a first capacitor arranged in parallel between the two pins; the second connecting member includes at least one parallel switch, and the parallel switch is arranged in parallel with the first capacitor.

9. The battery protection board according to claim 1, characterized in that: The second connecting member includes a second reserved pad; The second reserved pads are connected to the two pins respectively.

10. The battery protection board according to claim 9, characterized in that: The second connecting member includes a second capacitor; The second capacitor is suitable for being arranged on the second reserved pad to couple the two pins.

11. The battery protection board according to claim 9, characterized in that: The second connecting member includes a third resistor; The third resistor is mounted on the second reserved pad and is suitable for short-circuiting the two pins.

12. The battery protection board according to claim 11, characterized in that: The third resistor is a 0 ohm resistor.

13. The battery protection board according to claim 1, characterized in that: Each of the pad groups is insulated from each other, and each of the pad groups includes one or more sub-pads; the sub-pads are suitable for connecting to the pins and / or battery cells of the chip.

14. The battery protection board according to claim 13, characterized in that: The battery protection board further includes a conductor sheet adapted to electrically connect the sub-pads in each of the pad groups.

15. The battery protection board according to claim 1, characterized in that: There are a plurality of chips, and each chip is suitable for connecting to a pad.

16. A battery assembly, characterized in that: The invention comprises a battery cell and a battery protection board according to any one of claims 1 to 15, wherein the battery cell and the battery protection board are electrically connected.

17. The battery assembly according to claim 16, wherein: It also includes a second adapter, one side of which is connected to the pad group and the other side is connected to the battery cell, and the second adapter is suitable for electrically connecting the battery cell and the battery protection board.

18. An electrical device, characterized in that: Comprising a battery assembly as described in any one of claims 16 to 17.

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