Circuit board, battery and electric appliance

Abstract

This application relates to the field of battery structure technology and discloses a circuit board, a battery, and an electrical device, including a flexible board body. The flexible board body includes a connecting portion and an extension portion. At least one first connecting end is provided on the surface of the connecting portion for connecting with the tab of the battery cell. The extension portion protrudes outward relative to the connecting portion and is provided with a protection device and a second connecting end. Multiple protection devices are provided and electrically connected to form a protection circuit for protecting the charging and discharging lines of the battery cell. The extension portion is used to overlap with at least a portion of the main board. At least one connector of the second connecting end is used for soldering to the main board. This can improve the battery energy density.

Description

Technical Field

[0001] This application relates to the field of battery structure technology, specifically to circuit boards, batteries, and electrical equipment. Background Technology

[0002] With the rapid development of industries such as portable electronic devices and electric vehicles, the requirements for battery energy density are increasing. As the core component of a battery, changes in the size of the battery cell will have a multifaceted impact on the battery's energy density.

[0003] In related technologies, batteries are typically made by encapsulating a cell and a protection board. The protection board is connected to the tabs of the cell to protect the cell during the charging and discharging process, ensuring that the cell can be charged and discharged in a safe and stable state, extending the cell's lifespan, and ensuring the safety of the power-consuming terminal (such as a mobile phone).

[0004] However, the protection board is located at the top of the battery. If the protection board is too large, it will occupy the overall volume of the battery, thereby affecting the capacity of the cell and reducing the energy density of the battery. Utility Model Content

[0005] This application provides a circuit board, a battery, and an electrical device that can improve battery energy density.

[0006] In a first aspect, this application provides a circuit board including a flexible board body. The flexible board body includes a connecting portion and an extension portion. At least one first connecting end is provided on the surface of the connecting portion for connecting with the tab of a battery cell. The extension portion protrudes outward relative to the connecting portion. A protection device and a second connecting end are provided on the extension portion. Multiple protection devices are provided and electrically connected to form a protection circuit for protecting the charging and discharging lines of the battery cell. The extension portion is used to overlap with at least a portion of the motherboard. At least one connector of the second connecting end is used for soldering to the motherboard.

[0007] Beneficial effects: Since the protection devices in the protection circuit are located at the extension of the flexible board body and not at the connection part used for electrical connection with the cell tabs, the protection devices are moved out of the battery, reducing the volume in the battery package and thus improving the energy density of the battery.

[0008] Meanwhile, the protection device is located at the extension of the flexible board body. Since the motherboard itself has electronic components that occupy a certain thickness space of the electronic equipment, and the extension overlaps with at least a part of the motherboard, the protection device can be placed in the space occupied by the electronic components on the motherboard, thus avoiding increasing the thickness of the electronic equipment.

[0009] Furthermore, at least one connector in the second connection end is soldered to the motherboard of the mobile phone, which reduces the number of connectors required.

[0010] In one optional embodiment, the second connection end includes a power supply connector and at least one signal connector, the power supply connector being used to connect to the motherboard, and the signal connector being used to connect to the motherboard.

[0011] In an optional embodiment, the extension includes a main board body, a first side ear plate and a second side ear plate. The main board body extends along a first direction, and the first side ear plate and the second side ear plate are respectively connected to the two ends of the main board body along a second direction. The power supply connector is located on the main board body, and a plurality of signal connectors are distributed on the first side ear plate and the second side ear plate.

[0012] The first direction and the second direction are intersecting.

[0013] In one optional embodiment, the signal connector includes solder pads and screw pads; the power supply connector is a snap-fit ​​connector.

[0014] In one optional embodiment, the first side ear plate is provided with at least one solder pad at each end along the first direction, and the first side ear plate is provided with at least one screw pad at the end along the second direction; and / or, the second side ear plate is provided with at least one solder pad at each end along the first direction, and the second side ear plate is provided with at least one screw pad at the end along the second direction.

[0015] In an optional embodiment, a reinforcing portion is further included, which is disposed on the extension portion. In a direction perpendicular to the extension portion, the orthographic projection of the power supply connector on the extension portion at least partially coincides with the orthographic projection of the reinforcing portion on the extension portion.

[0016] In one optional implementation, there are two first connection terminals, each used to connect to the tabs of two battery cells.

[0017] In one optional embodiment, the extension is provided with a first surface and a second surface disposed opposite to each other, the protective device and the second connecting end are respectively disposed on the first surface and the second surface, or both the protective device and the second connecting end are disposed on the first surface, or both the protective device and the second connecting end are disposed on the second surface.

[0018] Secondly, this application also provides a battery, including at least one battery cell and a circuit board according to any embodiment of the first aspect, wherein the battery cell is provided with tabs; and a first connection end of the connection portion of the circuit board is electrically connected to the tabs.

[0019] Beneficial effects: Since the battery includes a circuit board, it has the same technical effects as the circuit board, which will not be elaborated here.

[0020] Thirdly, this application also provides an electrical device, including the battery described in the second aspect.

[0021] Beneficial effects: Since the electrical equipment includes batteries, it has the same technical effects as batteries, which will not be elaborated here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a front view of a circuit board according to an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of a circuit board and a motherboard in accordance with an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of a battery according to an embodiment of this application.

[0026] Explanation of reference numerals in the attached figures:

[0027] X, first direction; Y, second direction;

[0028] 1. Flexible circuit board body; 2. Battery cell; 3. Mainboard;

[0029] 11. Connecting part; 12. Extension part; 13. Reinforcing part;

[0030] 111. First connection end;

[0031] 121. Protective device; 122. Second connection end; 123. Main board body; 124. First side ear plate; 125. Second side ear plate; 126. First surface;

[0032] 1221 Power connector; 1222 Signal connector; 12221 Solder pad; 12222 Screw pad;

[0033] 21. Extreme ear. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] In related technologies, batteries are typically made by encapsulating a cell and a protection board. The protection board is connected to the tabs of the cell to protect the cell during the charging and discharging process, ensuring that the cell can be charged and discharged in a safe and stable state, extending the cell's lifespan, and ensuring the safety of the power-consuming terminal (such as a mobile phone).

[0036] However, the protection board is located at the top of the battery. If the protection board is too large, it will occupy the overall volume of the battery, thereby affecting the capacity of the cell and reducing the energy density of the battery.

[0037] Therefore, in order to improve battery energy density, this application provides a circuit board, a battery, and an electrical device.

[0038] The following is combined Figures 1 to 3 This describes an embodiment of the present application.

[0039] According to embodiments of this application, in a first aspect, a circuit board is provided, such as... Figure 1 and Figure 2 As shown, it includes a flexible board body 1. Specifically, the flexible board body 1 is an FPC (Flexible Printed Circuit, which is a highly reliable and flexible printed circuit board made of polyimide or polyester film as a substrate; it has the characteristics of high wiring density, light weight, thin thickness and good bending), or it can be other connecting lines, such as flat flexible cables, etc. The flexible board body 1 includes a connecting part 11 and an extension part 12, and the specific scheme is as follows.

[0040] like Figure 1 and Figure 2 As shown, at least one first connection end 111 is provided on the surface of the connection part 11 for connecting with the tab 21 of the battery cell 2; specifically, the first connection end 111 is welded to the tab 21 of the battery cell 2 by laser welding through a nickel sheet.

[0041] It should be noted that the first connection end 111 is provided with a welding part that is respectively connected to the positive electrode tab 21 and the negative electrode tab 21 of the battery cell 2. When there are multiple first connection ends 111, they can be used to connect with multiple battery cells 2.

[0042] like Figure 1 and Figure 2 As shown, the extension 12 protrudes outward relative to the connecting part 11. The extension 12 is provided with a protection device 121 and a second connecting end 122. Multiple protection devices 121 are provided and electrically connected to form a protection circuit for protecting the charging and discharging lines of the battery cell 2. The extension 12 is used to overlap with the main board 3. At least one connector of the second connecting end 122 is used to be soldered to the main board 3.

[0043] Specifically, the protection device 121 is at least two of the following: a fuse, a thermistor, a protection IC, and a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). All of the above components are existing components, and their specific use and combination connections are existing technologies, which will not be described in detail here.

[0044] It should be explained that the "connecting part 11" refers to the part on the flexible plate body 1 near the first end face; the "extension part 12" refers to the part on the flexible plate body 1 near the second end face.

[0045] In specific usage, such as Figure 1 and Figure 2 As shown, taking the application of circuit boards in mobile phones as an example, by welding the first connecting end 111 of the connecting part 11 of the flexible board body 1 to the electrode 21 of the battery cell 2 through a nickel sheet, the extension part 12 of the flexible board body 1 overlaps with at least a part of the motherboard 3 of the mobile phone, and at least one connector of the second connecting end 122 is welded to the motherboard 3 of the mobile phone.

[0046] In this embodiment, such as Figure 1 and Figure 2 As shown, since the protection device 121 in the protection circuit is located at the extension 12 of the flexible plate body 1 and is not located at the connection part 11 for electrical connection with the electrode 21 of the cell 2, the protection device 121 is moved out of the battery, reducing the volume in the battery package, thereby improving the energy density of the battery.

[0047] Meanwhile, the protection device 121 is disposed at the extension 12 of the flexible board body 1. Since the main board 3 itself has electronic components, which occupy a certain thickness space of the electronic device, and the extension 12 overlaps with at least a part of the main board 3, the protection device 121 can be disposed in the space occupied by the electronic components on the main board 3, thus avoiding increasing the thickness of the electronic device.

[0048] Furthermore, at least one connector in the second connector 122 is soldered to the motherboard 3 of the mobile phone, which reduces the number of connectors used.

[0049] In one embodiment, such as Figure 1 and Figure 2 As shown, the second connection terminal 122 includes a power supply connector 1221 and at least one signal connector 1222. The power supply connector 1221 is used to connect to the motherboard 3 to transmit current; the signal connector 1222 is used to connect to the motherboard 3 to transmit signals, including battery status signals and control signals from the motherboard 3 to the battery.

[0050] Specifically, there can be one or more signal connectors 1222, usually multiple, to transmit different types of signals.

[0051] In specific usage, such as Figure 1 and Figure 2 As shown, taking a mobile phone as an example, the signal connector 1222 used to transmit signals such as battery voltage and power is connected to the motherboard 3 of the mobile phone, and the power connector used to charge the battery cell 2 and supply power to the motherboard 3 of the mobile phone is connected to the motherboard 3 of the mobile phone, so as to separate the charging and discharging transmission and the signal transmission.

[0052] In this embodiment, such as Figure 1 and Figure 2 As shown, by setting a power supply connector 1221 and at least one signal connector 1222 on the flexible board body 1, the charging and discharging transmission and signal transmission can be separated, avoiding the lines on the flexible board body 1 from transmitting both current and signals, thereby reducing the internal resistance of PCM (Pulse Code Modulation).

[0053] In one embodiment, such as Figure 1 and Figure 2 As shown, the extension 12 includes a main board body 123, a first side ear plate 124, and a second side ear plate 125. Specifically, the main board body 123, the first side ear plate 124, and the second side ear plate 125 are integrally formed. The main board body 123 extends along the first direction X, and the first side ear plate 124 and the second side ear plate 125 are respectively connected to the two ends of the main board body 123 along the second direction Y. The power supply connector 1221 is located on the main board body 123, and multiple signal connectors 1222 are distributed on the first side ear plate 124 and the second side ear plate 125. The first direction X and the second direction Y intersect, and the angle between the second direction Y and the first direction X is 30° to 90°, usually 90°, but can also be any of the following angles: 30°, 40°, 50°, 60°, 70°, and 80°.

[0054] Specifically, both the first side ear plate 124 and the second side ear plate 125 are provided with signal connectors 1222. The number of signal connectors 1222 on the first side ear plate 124 or the number of signal connectors 1222 on the second side ear plate 125 can be adaptively set according to the spatial arrangement requirements. The signal connectors 1222 are located at the edge of the first side ear plate 124 or the second side ear plate 125.

[0055] In this embodiment, such as Figure 1 and Figure 2 As shown, the power supply connector is located on the main board 123, and the signal connectors are distributed on the first side ear plate 124 and the second side ear plate 125. The dispersed arrangement facilitates connection with the corresponding connectors on the main board 3, making operation easier and reducing the risk of short circuits.

[0056] In a specific embodiment, such as Figure 1 and Figure 2 As shown, the signal connector 1222 includes solder pads 12221 and screw pads 12222, and may also include other types of connectors, which can be selected and set according to requirements; the power supply connector 1221 is a snap-fit ​​connector, and may also be other types of connectors, which can be selected and set according to requirements.

[0057] In this embodiment, the signal connector 1222 includes a solder pad 12221 and a screw pad 12222; the power supply connector 1221 is a snap-fit ​​connector, both of which are existing connectors with mature structures, stable signal transmission, and low prices.

[0058] In one embodiment, such as Figure 1 and Figure 2 As shown, the first side ear plate 124 is provided with at least one solder pad 12221 at both ends along the first direction X, specifically 2 to 4, preferably 3; the first side ear plate 124 is provided with at least one screw pad 12222 at the end along the second direction Y, specifically 2 to 4, preferably 2.

[0059] And / or, the second side ear plate 125 is provided with at least one welding pad 12221 at both ends along the first direction X, specifically 2 to 4, preferably 3; the second side ear plate 125 is provided with at least one screw pad 12222 at the end along the second direction Y, specifically 2 to 4, preferably 2.

[0060] Specifically, the solder pad 12221 has a fast connection speed; the screw pad 12222 is connected to the motherboard 3 via screws, ensuring a stable connection.

[0061] In practical use, the power supply connector 1221 on the flexible board body 1 is first plugged into the corresponding connector on the motherboard 3. Then, the screw pads 12222 on the first side ear plate 124 and the second side ear plate 125 are screwed into the parts on the motherboard 3. This enables the pre-fixation of the extension 12 of the flexible board body 1, which facilitates the alignment of the solder pads 12221 with the corresponding connectors on the motherboard 3 for easy soldering.

[0062] In this embodiment, such as Figure 1 and Figure 2 As shown, by providing at least one screw pad 12222 at the end of the first side ear plate 124 and the second side ear plate 125 along the first direction X, the extension 12 of the flexible board body 1 and the main board 3 can be pre-positioned, which facilitates the welding of the welding pad 12221.

[0063] In one embodiment, such as Figure 1 and Figure 2 As shown, the flexible panel body 1 also includes a reinforcing part 13, which is disposed on the extension 12. Along the direction perpendicular to the extension 12, the orthographic projection of the power supply connector 1221 on the extension 12 at least partially overlaps with the orthographic projection of the reinforcing part 13 on the extension 12. Specifically, the reinforcing part 13 can be a steel sheet, with the steel sheet and the power supply connector respectively disposed on both sides of the extension 12. The reinforcing part 13 can also be a PI (Polyimide) reinforcement, with the PI reinforcement and the power supply connector located on one side of the extension 12. Steel sheet reinforcement is commonly used, as it has a simple structure.

[0064] In this embodiment, by providing a reinforcing part 13, the reinforcing part 13 and the power supply connector 1221 are respectively located on opposite sides of the connecting part 11, and the power supply connector 1221 is partially overlapped with the reinforcing part 13, thereby improving the deformation resistance of the corresponding part of the power supply connector 1221 on the flexible plate body 1.

[0065] In one embodiment, such as Figure 3 As shown, there are two first connection terminals 111. The two first connection terminals 111 are used to connect to the tabs 21 of the two battery cells 2 respectively. Specifically, the two first connection terminals 111 are arranged side by side.

[0066] Specifically, as shown in the figure, the two battery cells 2 are arranged side by side, and the first connection end 111 of the flexible board body 1 connected to the battery cells 2 is encapsulated with the battery cells 2 as a whole.

[0067] In this embodiment, by setting multiple first connection terminals 111, a large capacity power supply can be achieved by connecting multiple battery cells 2 in parallel while ensuring that the single battery cell 2 does not exceed the limit, and the charging rate can be improved at the same time.

[0068] In one embodiment, such as Figure 1 and Figure 2 As shown, the extension 12 is provided with a first surface 126 and a second surface (not shown in the figure) that are disposed opposite to each other. The protective device 121 and the second connecting end 122 are respectively disposed on the first surface 126 and the second surface, or the protective device 121 and the second connecting end 122 are both disposed on the first surface 126 or the second surface.

[0069] In practical use, the protection device 121 and the second connection end 122 are respectively set on the first surface 126 and the second surface. The protection device 121 can be accommodated by the component opposite to the motherboard 3 to avoid increasing the thickness of the electrical equipment; or the heat dissipation system set on the component can be directly cooled by the motherboard 3.

[0070] The protection device 121 and the second connection terminal 122 are both disposed on the first surface 126, or the protection device 121 and the second connection terminal 122 are both disposed on the second surface. They can be accommodated by the space occupied by the electronic components on the motherboard 3 and cooled by the heat dissipation system arranged on the motherboard 3.

[0071] The following specific embodiment illustrates the overall solution of this application.

[0072] In another aspect, embodiments of this application provide a circuit board, such as... Figure 1 and Figure 2 As shown, it includes a flexible board body 1. Specifically, the flexible board body 1 is an FPC (Flexible Printed Circuit, a type of printed circuit board made of polyimide or polyester film as a substrate, which has high reliability and excellent flexibility. It has the characteristics of high wiring density, light weight, thin thickness and good bending). It can also be other connecting lines, such as flat flexible cables. The flexible board body 1 includes a connecting part 11 and an extension part 12, as shown in the following specific design.

[0073] like Figure 1 and Figure 2 As shown, at least one first connection end 111 is provided on the surface of the connection part 11 for connecting with the tab 21 of the battery cell 2; specifically, the first connection end 111 is welded to the tab 21 of the battery cell 2 by laser welding through a nickel sheet.

[0074] It should be noted that the first connection end 111 is provided with a welding part that is respectively connected to the positive electrode tab 21 and the negative electrode tab 21 of the battery cell 2. When there are multiple first connection ends 111, they can be used to connect with multiple battery cells 2.

[0075] like Figure 1 and Figure 2As shown, the extension 12 protrudes outward relative to the connecting part 11. The extension 12 is provided with a protection device 121 and a second connecting end 122. Multiple protection devices 121 are provided and electrically connected to form a protection circuit for protecting the charging and discharging lines of the battery cell 2. The extension 12 is used to overlap with the main board 3. At least one connector of the second connecting end 122 is used to be soldered to the main board 3.

[0076] Specifically, the protection device 121 is at least two of the following: a fuse, a thermistor, a protection IC, and a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor). All of the above components are existing components, and their specific use and combination connections are existing technologies, which will not be described in detail here.

[0077] It should be explained that the "connecting part 11" refers to the part on the flexible plate body 1 near the first end face; the "extension part 12" refers to the part on the flexible plate body 1 near the second end face.

[0078] More specifically, such as Figure 1 and Figure 2 As shown, the second connection terminal 122 includes a power supply connector 1221 and at least one signal connector 1222. The power supply connector 1221 is used to connect to the motherboard 3 to transmit current; the signal connector 1222 is used to connect to the motherboard 3 to transmit signals, including battery status signals and control signals from the motherboard 3 to the battery.

[0079] Specifically, there can be one or more signal connectors 1222, usually multiple, to transmit different types of signals.

[0080] More specifically, such as Figure 1 and Figure 2 As shown, the extension 12 includes a main board body 123, a first side ear plate 124, and a second side ear plate 125. Specifically, the main board body 123, the first side ear plate 124, and the second side ear plate 125 are integrally formed. The main board body 123 extends along the first direction X, and the first side ear plate 124 and the second side ear plate 125 are respectively connected to the two ends of the main board body 123 along the second direction Y. The power supply connector 1221 is located on the main board body 123, and multiple signal connectors 1222 are distributed on the first side ear plate 124 and the second side ear plate 125. The first direction X and the second direction Y intersect, and the angle between the second direction Y and the first direction X is 30° to 90°, usually 90°, but can also be any of the following angles: 30°, 40°, 50°, 60°, 70°, and 80°.

[0081] Specifically, both the first side ear plate 124 and the second side ear plate 125 are provided with signal connectors 1222. The number of signal connectors 1222 on the first side ear plate 124 or the number of signal connectors 1222 on the second side ear plate 125 can be adaptively set according to the spatial arrangement requirements. The signal connectors 1222 are located at the edge of the first side ear plate 124 or the second side ear plate 125.

[0082] More specifically, such as Figure 1 and Figure 2 As shown, the signal connector 1222 includes solder pads 12221 and screw pads 12222, and may also include other types of connectors, which can be selected and set according to requirements; the power supply connector 1221 is a snap-fit ​​connector, and may also be other types of connectors, which can be selected and set according to requirements.

[0083] More specifically, such as Figure 1 and Figure 2 As shown, the first side ear plate 124 is provided with at least one solder pad 12221 at both ends along the first direction X, specifically 2 to 4, preferably 3; the first side ear plate 124 is provided with at least one screw pad 12222 at the end along the second direction Y, specifically 2 to 4, preferably 2.

[0084] And / or, the second side ear plate 125 is provided with at least one welding pad 12221 at both ends along the first direction X, specifically 2 to 4, preferably 3; the second side ear plate 125 is provided with at least one screw pad 12222 at the end along the second direction Y, specifically 2 to 4, preferably 2.

[0085] Specifically, the solder pad 12221 has a fast connection speed; the screw pad 12222 is connected to the motherboard 3 via screws, ensuring a stable connection.

[0086] More specifically, such as Figure 1 and Figure 2 As shown, the flexible panel body 1 also includes a reinforcing part 13, which is disposed on the extension 12. Along the direction perpendicular to the extension 12, the orthographic projection of the power supply connector 1221 on the extension 12 at least partially overlaps with the orthographic projection of the reinforcing part 13 on the extension 12. Specifically, the reinforcing part 13 can be a steel sheet, with the steel sheet and the power supply connector respectively disposed on both sides of the extension 12. The reinforcing part 13 can also be a PI (Polyimide) reinforcement, with the PI reinforcement and the power supply connector located on one side of the extension 12. Steel sheet reinforcement is commonly used, as it has a simple structure.

[0087] More specifically, such as Figure 3As shown, there are two first connection terminals 111. The two first connection terminals 111 are used to connect to the tabs 21 of the two battery cells 2 respectively. Specifically, the two first connection terminals 111 are arranged side by side.

[0088] Specifically, as shown in the figure, the two battery cells 2 are arranged side by side, and the first connection end 111 of the flexible board body 1 connected to the battery cells 2 is encapsulated with the battery cells 2 as a whole.

[0089] More specifically, such as Figure 1 and Figure 2 As shown, the extension 12 is provided with a first surface 126 and a second surface (not shown in the figure) that are disposed opposite to each other. The protective device 121 and the second connecting end 122 are respectively disposed on the first surface 126 and the second surface, or the protective device 121 and the second connecting end 122 are both disposed on the first surface 126, or the protective device 121 and the second connecting end 122 are both disposed on the second surface.

[0090] According to embodiments of this application, in a second aspect, a battery is provided, such as... Figure 3 As shown, the circuit includes at least one battery cell 2 and a circuit board in the second aspect. The battery cell 2 is provided with a tab 21. The first connection end 111 of the connection portion 11 of the circuit board is electrically connected to the tab 21.

[0091] Specifically, batteries can be used in electronic devices such as mobile phones and tablets.

[0092] In this embodiment, since the battery includes a circuit board and has the same technical effects as the circuit board, it will not be described in detail here.

[0093] According to an embodiment of this application, in a third aspect, an electrical device is provided, comprising: the battery described in the second aspect.

[0094] Specifically, the electrical equipment can be electronic devices such as mobile phones and tablets.

[0095] In this embodiment, since the electrical device includes a battery and has the same technical effects as a battery, it will not be described in detail here.

[0096] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A circuit board, characterized in that, include: A flexible plate body (1), the flexible plate body (1) comprising: A connecting part (11) is provided on the surface of the connecting part (11) for connecting to the tab (21) of the battery cell (2); An extension (12) protrudes outward relative to the connecting part (11). The extension (12) is provided with a protection device (121) and a second connecting end (122). Multiple protection devices (121) are provided and are electrically connected to form a protection circuit for protecting the charging and discharging lines of the battery cell (2). The extension (12) is used to overlap with at least a part of the main board (3). At least one connector of the second connecting end (122) is used to be soldered to the main board (3).

2. The circuit board according to claim 1, characterized in that, The second connection end (122) includes a power supply connector (1221) and at least one signal connector (1222). The power supply connector (1221) is used to connect to the motherboard (3), and the signal connector (1222) is used to connect to the motherboard (3).

3. The circuit board according to claim 2, characterized in that, The extension (12) includes a main board body (123), a first side ear plate (124), and a second side ear plate (125). The main board body (123) extends along a first direction (X). The first side ear plate (124) and the second side ear plate (125) are respectively connected to the two ends of the main board body (123) along a second direction (Y). The power supply connector (1221) is located on the main board body (123), and a plurality of signal connectors (1222) are distributed on the first side ear plate (124) and the second side ear plate (125). The first direction (X) and the second direction (Y) are intersecting.

4. The circuit board according to claim 3, characterized in that, The signal connector (1222) includes a solder pad (12221) and a screw pad (12222); the power supply connector (1221) is a snap-fit ​​connector.

5. The circuit board according to claim 4, characterized in that, The first side ear plate (124) is provided with at least one solder pad (12221) at both ends along the first direction (X), and the first side ear plate (124) is provided with at least one screw pad (12222) at the end along the second direction (Y). And / or, the second side ear plate (125) is provided with at least one solder pad (12221) at both ends along the first direction (X), and the second side ear plate (125) is provided with at least one screw pad (12222) at the end along the second direction (Y).

6. The circuit board according to any one of claims 2 to 5, characterized in that, It also includes a reinforcing part (13), which is disposed on the extension (12). In a direction perpendicular to the extension (12), the orthographic projection of the power supply connector (1221) on the extension (12) at least partially overlaps with the orthographic projection of the reinforcing part (13) on the extension (12).

7. The circuit board according to any one of claims 1 to 5, characterized in that, There are two first connection terminals (111), and the two first connection terminals (111) are respectively used to connect to the tabs (21) of the two cells (2).

8. The circuit board according to any one of claims 1 to 5, characterized in that, The extension (12) is provided with a first surface (126) and a second surface that are disposed opposite to each other. The protective device (121) and the second connecting end (122) are respectively disposed on the first surface (126) and the second surface, or the protective device (121) and the second connecting end (122) are both disposed on the first surface (126), or the protective device (121) and the second connecting end (122) are both disposed on the second surface.

9. A battery, characterized in that, include: At least one battery cell (2), wherein the battery cell (2) is provided with tabs (21); The circuit board according to any one of claims 1 to 8, wherein the first connection end (111) of the connection portion (11) of the circuit board is electrically connected to the tab (21).

10. An electrical appliance, characterized in that, include: The battery as described in claim 9.

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