Battery protection plate and battery assembly and electric device with same

Abstract

This utility model discloses a battery protection board and a battery assembly and electrical device having the same. The battery protection board includes: a circuit board adapted to be electrically connected to a battery cell; and external terminals for a protection device. Both the protection device and the external terminals are disposed on the circuit board, on the same side of the circuit board, and electrically connected to it. The external terminals have a ring structure. The circuit board includes a mounting area, and the orthographic projection of the mounting area is surrounded by the orthographic projection of the external terminals in the thickness direction of the circuit board. The protection device is disposed in the mounting area. According to this utility model, the battery protection board places the protection device in the mounting area, placing it inside the external terminals. This facilitates full utilization of the space inside the external terminals, improves the space utilization rate on the circuit board, and facilitates the miniaturization design of the battery protection board. Simultaneously, the external terminals can be used to protect the protection device.

Description

Technical Field

[0001] This utility model relates to the field of battery protection board technology, specifically to a battery protection board and a battery assembly and electrical device having the same. Background Technology

[0002] The battery protection board in the relevant technology needs to set up multiple components, which results in a large size of the battery protection board and requires a lot of space. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery protection board that places the protection device in the mounting area, positioning it inside the external terminals. This facilitates full utilization of the space inside the external terminals, improving the space utilization rate on the circuit board and enabling miniaturized design of the battery protection board. Simultaneously, the external terminals can be used to protect the protection device, creating an electromagnetic shielding environment and reducing interference from external electrical signals.

[0004] This utility model also proposes a battery assembly having the aforementioned battery protection board.

[0005] This utility model also proposes an electrical device having the aforementioned battery assembly.

[0006] A battery protection board according to a first aspect of the present invention includes: a circuit board adapted to be electrically connected to a battery cell; a protection device and an external terminal, both the protection device and the external terminal being disposed on the circuit board, both being disposed on the same side of the circuit board and both being electrically connected to the circuit board; wherein the external terminal has an annular structure; the circuit board includes a mounting area; in the thickness direction of the circuit board, the orthographic projection of the mounting area is surrounded by the orthographic projection of the external terminal; and the protection device is disposed in the mounting area.

[0007] According to the battery protection board of this utility model embodiment, the protection device is set in the mounting area, so that the protection device is located inside the external terminal, which makes it easier to make full use of the space inside the external terminal, improve the space utilization rate on the circuit board, and facilitate the miniaturization design of the battery protection board. At the same time, the external terminal can be used to protect the protection device, defining an electromagnetic shielding environment for the protection device and reducing the interference of external electrical signals on the protection device.

[0008] In addition, the battery protection board according to the above embodiments of this utility model may also have the following additional technical features:

[0009] According to some embodiments of the present invention, the circuit board includes a first part and a second part that are interconnected. The first part is adapted to be electrically connected to the battery cell, and the protection device and the external terminal are disposed in the second part. The extending directions of the first part and the extending directions of the second part intersect.

[0010] According to some optional embodiments of the present invention, the first part is provided with a positive terminal and a negative terminal, which are adapted to be connected to the positive and negative terminals of the battery cell.

[0011] According to some optional embodiments of the present invention, the first part and the second part are arranged vertically.

[0012] According to some optional embodiments of the present invention, the first part includes a first flexible circuit board, which is adapted to be electrically connected to the battery cell.

[0013] According to some specific embodiments of the present invention, the second part includes a second flexible circuit board and a rigid circuit board. The second flexible circuit board and the first flexible circuit board are electrically connected. The rigid circuit board and the second flexible circuit board are stacked and electrically connected. The protection device and the external terminal are fixedly connected to the side of the rigid circuit board facing away from the second flexible circuit board.

[0014] According to some specific embodiments of the present invention, the second part includes a second flexible circuit board, the second flexible circuit board and the first flexible circuit board are electrically connected, and the protection device and the external terminal are fixedly connected to the second flexible circuit board.

[0015] In some embodiments, the first flexible circuit board and the second flexible circuit board are an integral piece.

[0016] According to a second aspect of the present invention, a battery assembly is provided, the battery assembly comprising: a battery cell; a battery protection board, wherein the battery protection board is the same as that described in the first aspect of the present invention, and the circuit board is electrically connected to the battery cell.

[0017] According to the battery assembly of the present invention, by utilizing the battery protection board described in the first aspect of the present invention, the protection device is disposed in the mounting area, so that the protection device is located inside the external terminal, which facilitates full utilization of the space inside the external terminal, improves the space utilization rate on the circuit board, and facilitates the miniaturization design of the battery protection board, which reduces the space occupied by the battery protection board in the battery assembly. At the same time, the external terminal can be used to protect the protection device, defining an electromagnetic shielding environment for the protection device and reducing the interference of external electrical signals to the protection device.

[0018] According to a third aspect of the present invention, an electrical device is provided, the electrical device comprising: a battery assembly, wherein the battery assembly is the battery assembly described in the second aspect of the present invention.

[0019] According to the embodiments of the present invention, the power device utilizes the battery assembly described in the second aspect of the present invention to place the protection device in the mounting area, so that the protection device is located inside the external terminal, which facilitates full utilization of the space inside the external terminal, improves the space utilization rate on the circuit board, and facilitates the miniaturization design of the battery protection board. At the same time, the external terminal can be used to protect the protection device, defining an electromagnetic shielding environment for the protection device and reducing the interference of external electrical signals on the protection device.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a schematic diagram of the structure of the battery protection board according to an embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the second part of the battery protection board according to an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the first flexible circuit board and the second flexible circuit board according to an embodiment of the present utility model.

[0025] Reference numerals: 1. Battery protection board; 10. Circuit board; 11. First part; 111. First flexible circuit board; 12. Second part; 121. Second flexible circuit board; 1211. First connecting pad; 122. Rigid circuit board; 123. Mounting area;

[0026] 21. Positive terminal; 22. Negative terminal;

[0027] 31. Protective devices; 32. External terminals. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] The battery protection board 1 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0030] like Figures 1-3 As shown, the battery protection board 1 according to an embodiment of the present invention includes a circuit board 10, a protection device 31, and an external terminal 32.

[0031] The circuit board 10 is adapted to be electrically connected to the battery cell. The protection device 31 and the external terminal 32 are both disposed on the same side of the circuit board 10, and the protection device 31 and the external terminal 32 are both electrically connected to the circuit board 10.

[0032] Specifically, the circuit board 10 is electrically connected to the battery cell, and the external terminal 32 is adapted to be electrically connected to an external device, thereby realizing the electrical connection between the battery cell and the external device using the circuit protection board 1. When the external device is an electrical consumer, the current at the battery cell can reach the external device through the circuit board 10, thereby powering the external device. When the external device is a charging device, the current inside the external device can reach the battery cell through the circuit board 10, thereby charging the battery cell.

[0033] The protection device 31 is used to monitor the current flowing through the circuit board 10, and then monitor the battery cell, such as whether the battery cell is overcharged, over-discharged, overcurrent, or short-circuited. When the battery cell is overcharged, over-discharged, overcurrent, or short-circuited, the protection device 31 and the circuit board 10 can disconnect the electrical connection between the battery cell and the external device, thereby improving the safety of current transmission between the battery cell and the external device.

[0034] The external terminal 32 has a ring structure. The circuit board 10 includes a mounting area 123. In the thickness direction of the circuit board 10, the orthographic projection of the mounting area 123 is surrounded by the orthographic projection of the external terminal 32. The protection device 31 is disposed in the mounting area 123 so that the protection device 31 is disposed inside the external terminal 32, so that the space inside the external terminal 32 can be fully utilized, thereby improving the space utilization rate on the circuit board 10 and facilitating the miniaturization design of the battery protection board 1.

[0035] Furthermore, by placing the protection device 31 in the mounting area 123, and positioning it inside the external terminal 32, the external terminal 32 can also protect the protection device 31, reducing the possibility of it being subjected to external impacts. Simultaneously, the external terminal 32 can also define an electromagnetic shielding environment for the protection device 31, thereby eliminating or reducing interference from external electrical signals and improving the accuracy of the protection device 31 in monitoring whether the battery cell has experienced overcharging, over-discharging, overcurrent, or short circuits.

[0036] According to the battery protection board 1 of this utility model embodiment, the protection device 31 is disposed in the mounting area 123, so that the protection device 31 is located inside the external terminal 32, which makes it easier to make full use of the space inside the external terminal 32, improve the space utilization rate on the circuit board 10, and facilitate the miniaturization design of the battery protection board 1. At the same time, the external terminal 32 can be used to protect the protection device 31, defining an electromagnetic shielding environment for the protection device 31 and reducing the interference of external electrical signals to the protection device 31.

[0037] The battery protection board 1 according to a specific embodiment of the present invention is described below with reference to the accompanying drawings.

[0038] In some specific embodiments of this utility model, such as Figures 1-3 As shown, the battery protection board 1 includes a circuit board 10, a protection device 31, and an external terminal 32.

[0039] In some embodiments of this utility model, such as Figure 1 As shown, the circuit board 10 includes a first part 11 and a second part 12 that are interconnected. The first part 11 is adapted to be electrically connected to the battery cell. The protection device 31 and the external terminal 32 are disposed in the second part 12. The extending direction of the first part 11 and the extending direction of the second part 12 intersect.

[0040] Specifically, the first part 11 is electrically connected to the battery cell. The first part 11 is located at the end of the battery cell. Therefore, the size of the first part 11 needs to match the size of the end face of the battery cell. Specifically, the size of the first part 11 does not exceed the size of the end face of the battery cell, so as to avoid the first part 11 being too large and affecting the overall size of the battery assembly.

[0041] Compared to placing the protection device 31 or the external terminal 32 on the first part 11, this embodiment places the protection device 31 and the external terminal 32 on the second part 12, which makes it easier to design the length and width of the first part 11 to be smaller, so that the battery protection board 1 can adapt to small-sized battery cells.

[0042] Furthermore, since the first part 11 is electrically connected to the battery cell, when applying the battery protection board 1 to the battery cell, the first part 11 needs to be placed at the end face of the battery cell and close to the battery cell. Compared to placing the protection device 31 on the first part 11, this embodiment places the protection device 31 on the second part 12, which allows the protection device 31 to be placed on the circuit board 10 at a position away from the battery cell, so as to avoid the heat generated at the protection device 31 from affecting the battery cell and causing the temperature of the battery cell to rise, thus affecting the charging and discharging efficiency of the battery cell.

[0043] In some optional embodiments of this utility model, such as Figure 1 As shown, the first part 11 is provided with a positive terminal 21 and a negative terminal 22. The positive terminal 21 and the negative terminal 22 are respectively adapted to be connected to the positive and negative terminals of the battery cell to realize the electrical connection between the circuit board 10 and the battery cell.

[0044] When the external device is an electrical component, the current at the battery cell can reach the external device through the circuit board 10, thereby powering the external device. When the external device is a charging component, the current inside the external device can reach the battery cell through the circuit board 10, thereby charging the battery cell.

[0045] In some optional embodiments of this utility model, such as Figure 1 As shown, the first part 11 and the second part 12 are set vertically.

[0046] like Figure 1 As shown, the first part 11 extends along the X direction, and the second part 12 extends along the Y direction. The second part 12 is located at one end of the first part 11 in the X direction. The second part 12 extends along the Y direction and protrudes from the first part 11. This facilitates the electrical connection between the external terminal 32 and external parts, so as to facilitate the electrical connection between the battery cell and external parts using the battery protection board 1.

[0047] In some optional embodiments of this utility model, such as Figure 1 , Figure 3 As shown, the first part 11 includes a first flexible circuit board 111, which is adapted to be electrically connected to the battery cell, thereby realizing the electrical connection between the battery cell and external components using the circuit board 10.

[0048] Specifically, the first part 11 is located at the end of the battery cell. Compared with a rigid circuit board, the flexible circuit board is thinner and occupies less space, so that the first flexible circuit board 111 is electrically connected to the battery cell, reducing the space occupied by the battery protection board 1 in the height direction of the battery cell, thereby making it easier to reduce the total space occupied by the battery protection board 1 and the battery cell in the height direction.

[0049] In some embodiments, such as Figure 1 As shown, two metal sheets are spaced apart on the first flexible circuit board 111. These two metal sheets define the positive terminal 21 and the negative terminal 22, respectively. The positive terminal 21 and the negative terminal 22 are electrically connected to the positive and negative terminals of the battery cell, respectively. When the battery protection board 1 is placed at the end of the battery cell, the two metal sheets on the first flexible circuit board 111 are in contact with the positive and negative terminals of the battery cell, respectively, so as to realize the electrical connection between the battery cell and the external device by using the circuit board 10.

[0050] In some examples, the metal sheet is a nickel sheet.

[0051] In some specific embodiments of this utility model, such as Figures 1-3 As shown, the second part 12 includes a second flexible circuit board 121 and a rigid circuit board 122. The second flexible circuit board 121 and the first flexible circuit board 111 are electrically connected. The rigid circuit board 122 and the second flexible circuit board 121 are stacked and electrically connected. The protection device 31 and the external terminal 32 are fixedly connected to the side of the rigid circuit board 122 facing away from the second flexible circuit board 121.

[0052] Specifically, a rigid circuit board 122 is provided on the second flexible circuit board 121, which can enhance the strength of the second part 12 in the circuit board 10.

[0053] The rigid circuit board 122 provides support for the protective device 31 to prevent the second part 12 from being damaged by the tearing force of the protective device 31 when it is fixed to the second part 12.

[0054] The first flexible circuit board 111 is electrically connected to the second flexible circuit board 121, and the second flexible circuit board 121 is electrically connected to the rigid circuit board 122. The current at the battery cell flows through the first flexible circuit board 111 to the second flexible circuit board 121, and then through the rigid circuit board 122 to the protection device 31. The protection device 31 monitors whether the battery cell is overcharged, over-discharged, overcurrented, or short-circuited. When the battery cell is overcharged, over-discharged, overcurrented, or short-circuited, the protection device 31 and the circuit board 10 disconnect the electrical connection between the battery cell and the external device, thereby improving the safety of current transmission between the battery cell and the external device.

[0055] Furthermore, in order to accommodate the size of the battery cell and the position of the positive and negative terminals of the battery cell, the size of the first part 11 is also different for different models of battery cells. In this embodiment, by fixing the protection device 31 on the rigid circuit board 122, it is not necessary to change the relative position and size of the protection device 31 and the rigid circuit board 122 for different models of battery cells. Only the size of the first flexible circuit board 111 needs to be changed, which facilitates the improvement of the versatility of the protection device 31 and the rigid circuit board 122.

[0056] Specifically, for the first flexible circuit board 111 and the second flexible circuit board 121 of different sizes, there is no need to change the size and position of the protective device 31 and the rigid circuit board 122. The rigid circuit board 122 can be directly fixed at the designated position of the second flexible circuit board 121, thereby improving the versatility of the rigid circuit board 122 and the protective device 31.

[0057] In some embodiments, the protection device 31 includes a plurality of protection elements, including a protection IC, a MOSFET switch, a current sensing resistor, a thermistor, etc. The plurality of protection elements are fixed on a rigid circuit board 122 and are electrically connected to a second flexible circuit board 121 through the rigid circuit board 122.

[0058] In some other specific embodiments of this utility model, the second part 12 includes a second flexible circuit board 121, which is electrically connected to the first flexible circuit board 111. The protection device 31 and the external terminal 32 are fixedly connected to the second flexible circuit board 121. The protection device 31 is used to monitor whether the battery cell is overcharged, over-discharged, overcurrented, or short-circuited. When the battery cell is overcharged, over-discharged, overcurrented, or short-circuited, the protection device 31 and the circuit board 10 are used to cut off the electrical connection between the battery cell and the external device, thereby improving the safety of current transmission between the battery cell and the external device.

[0059] In some embodiments, the protection device 31 is an integrated circuit module, which facilitates the fixed connection of the protection device 31 to the second flexible circuit board 121 and reduces the difficulty of installation.

[0060] Specifically, the protection device 31 includes multiple protection elements, which are interconnected with wiring and fabricated on one or more small pieces of semiconductor wafer or dielectric substrate, so that the protection device 31 can be fixedly connected to the second flexible circuit board 121 as a whole, thereby realizing the electrical connection between the multiple protection elements and the second flexible circuit board 121.

[0061] Among them, multiple protection components include protection ICs, MOSFET switches, current sensing resistors, thermistors, etc. These protection components are used to monitor whether the battery cell is overcharged, over-discharged, overcurrented, or short-circuited.

[0062] In some specific embodiments of this utility model, such as Figure 1 , Figure 3 As shown, the first flexible circuit board 111 and the second flexible circuit board 121 are integrated into one piece to enable electrical connection between the first flexible circuit board 111 and the second flexible circuit board 121.

[0063] Specifically, the first flexible circuit board 111 and the second flexible circuit board 121 are different parts of the same flexible circuit board.

[0064] In some embodiments, the second portion 12 includes a second flexible circuit board 121 and a rigid circuit board 122, the rigid circuit board 122 being fixed to a portion of the flexible circuit board and forming the second portion 12 together with this portion of the flexible circuit board, while another portion of the flexible circuit board defines the first portion 11.

[0065] In some specific embodiments of this utility model, the rigid circuit board 122 and the second flexible circuit board 121 are welded together to fix the rigid circuit board 122 and the second flexible circuit board 121 together and realize the electrical connection between the rigid circuit board 122 and the second flexible circuit board 121.

[0066] In some embodiments, such as Figure 3 As shown, the second flexible circuit board 121 has a first connecting pad 1211, and the rigid circuit board 122 has a second connecting pad. The second connecting pad corresponds to the first connecting pad 1211 in position. The second connecting pad and the first connecting pad 1211 are fixedly connected by welding. The rigid circuit board 122 is fixed to the second flexible circuit board 121 by welding the first connecting pad 1211 and the second connecting pad. At the same time, the first connecting pad 1211 and the second connecting pad are used to realize the electrical connection between the rigid circuit board 122 and the second flexible circuit board 121.

[0067] In some examples, the second flexible circuit board 121 has a plurality of first connection pads 1211, and the rigid circuit board 122 has a plurality of second connection pads. The positions of the plurality of first connection pads 1211 and the plurality of second connection pads correspond one-to-one, and the first connection pads 1211 and the second connection pads have the same properties.

[0068] In some specific embodiments of this utility model, the rigid circuit board 122 and the second flexible circuit board 121 are laminated parts, with the second part 12 defined by the rigid-flex plate.

[0069] Specifically, rigid-flex circuit boards include flexible circuit boards and rigid circuit boards, which are laminated together using a lamination process.

[0070] Rigid-flex circuit boards can include multilayer flexible circuit boards and rigid circuit boards, so that the rigid-flex circuit boards have both the ability to be flexibly deformed and a certain strength.

[0071] In some embodiments, the battery substrate 10 is a rigid-flex PCB, and the thickness of the first portion 11 is less than the thickness of the second portion 12.

[0072] The first part 11 has fewer layers than the second part 12. For example, the first part 11 has two layers and the second part 12 has four layers, so that the thickness of the first part 11 is less than the thickness of the second part 12.

[0073] In some embodiments of this utility model, the protection device 31 includes a protection IC, a MOSFET switch, a current sensing resistor, a thermistor, etc., which continuously measures the voltage, current and temperature flowing through the battery cell through a precise circuit, thereby detecting overcharging, over-discharging, overcurrent or short circuit conditions of the battery cell.

[0074] The following describes a battery assembly according to an embodiment of the present invention. The battery assembly according to an embodiment of the present invention includes individual battery cells and a battery protection board 1 according to the above embodiment of the present invention.

[0075] The circuit board 10 is electrically connected to the battery cell so that the current of the battery cell can be drawn out by the battery protection board 1. At the same time, the protection device 31 on the battery protection board 1 monitors the current transmitted by the cell, such as monitoring whether the cell is overcharged, over-discharged, overcurrent, or short-circuited. When the cell is overcharged, over-discharged, overcurrent, or short-circuited, the protection device 31 and the circuit board 10 disconnect the electrical connection between the cell and the external device.

[0076] According to the battery assembly of this utility model embodiment, by utilizing the circuit board 10, the protection device 31 is disposed in the mounting area 123, so that the protection device 31 is located inside the external terminal 32, which makes it easier to make full use of the space inside the external terminal 32, improves the space utilization rate on the circuit board 10, and facilitates the miniaturization design of the battery protection board 1. At the same time, the external terminal 32 can be used to protect the protection device 31, defining an electromagnetic shielding environment for the protection device 31 and reducing the interference of external electrical signals to the protection device 31.

[0077] In some embodiments of this utility model, the positive and negative electrodes of the battery cell are located on the same side of the battery cell. The circuit board 10 is provided with a positive electrode connection terminal 21 and a negative electrode connection terminal 22. The positive electrode connection terminal 21 is adapted to be electrically connected to the positive electrode of the battery cell, and the negative electrode connection terminal 22 is adapted to be electrically connected to the negative electrode of the battery cell, so as to realize the electrical connection between the circuit board 10 and the battery cell.

[0078] Other configurations and operations of the battery assembly according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0079] The following describes an electrical device according to an embodiment of the present invention. The electrical device according to an embodiment of the present invention includes a battery assembly according to the above-described embodiment of the present invention.

[0080] The electrical devices mentioned here can include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0081] Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys; spacecraft can include airplanes, rockets, space shuttles, and spacecraft; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0082] In some embodiments, the electrical device is a vehicle, which may be a pure electric vehicle or a hybrid vehicle.

[0083] According to the embodiment of the present invention, the power device utilizes a battery assembly to place the protection device 31 in the mounting area 123, so that the protection device 31 is located inside the external terminal 32. This facilitates full utilization of the space inside the external terminal 32, improves the space utilization rate on the circuit board 10, and facilitates the miniaturization design of the battery protection board 1. At the same time, the external terminal 32 can be used to protect the protection device 31, defining an electromagnetic shielding environment for the protection device 31 and reducing the interference of external electrical signals to the protection device 31.

[0084] Other components and operations of the electrical device according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0085] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, "above" or "below" a second feature may include direct contact between the first and second features, or it may include contact between the first and second features not being in direct contact but through another feature between them.

[0086] In the description of this utility model, the terms "above", "over" and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0087] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0088] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0089] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery protection board (1), characterized in that, The battery protection board (1) includes: Circuit board (10), said circuit board (10) is adapted to be electrically connected to the battery cell; The circuit board (10) includes a protection device (31) and an external terminal (32). Both the protection device (31) and the external terminal (32) are located on the same side of the circuit board (10) and are electrically connected to the circuit board (10). The external terminal (32) is a ring structure, the circuit board (10) includes a mounting area (123), and the orthographic projection of the mounting area (123) is surrounded by the orthographic projection of the external terminal (32) in the thickness direction of the circuit board (10). The protective device (31) is disposed in the mounting area (123).

2. The battery protection board (1) according to claim 1, characterized in that, The circuit board (10) includes a first part (11) and a second part (12) that are connected to each other. The first part (11) is adapted to be electrically connected to the battery cell. The protection device (31) and the external terminal (32) are disposed in the second part (12). The extension direction of the first part (11) and the extension direction of the second part (12) intersect.

3. The battery protection board (1) according to claim 2, characterized in that, The first part (11) is provided with a positive terminal (21) and a negative terminal (22), which are adapted to be connected to the positive and negative terminals of the battery cell.

4. The battery protection board (1) according to claim 2, characterized in that, The first part (11) and the second part (12) are arranged vertically.

5. The battery protection board (1) according to claim 2, characterized in that, The first part (11) includes a first flexible circuit board (111) adapted to be electrically connected to the battery cell.

6. The battery protection board (1) according to claim 5, characterized in that, The second part (12) includes a second flexible circuit board (121) and a rigid circuit board (122). The second flexible circuit board (121) and the first flexible circuit board (111) are electrically connected. The rigid circuit board (122) and the second flexible circuit board (121) are stacked and electrically connected. The protection device (31) and the external terminal (32) are fixedly connected to the side of the rigid circuit board (122) facing away from the second flexible circuit board (121).

7. The battery protection board (1) according to claim 5, characterized in that, The second part (12) includes a second flexible circuit board (121), which is electrically connected to the first flexible circuit board (111), and the protection device (31) and the external terminal (32) are fixedly connected to the second flexible circuit board (121).

8. The battery protection board (1) according to claim 6 or 7, characterized in that, The first flexible circuit board (111) and the second flexible circuit board (121) are an integral piece.

9. A battery assembly, characterized in that, include: Battery cell; Battery protection board (1), wherein the battery protection board (1) is the battery protection board (1) according to any one of claims 1-8, and the circuit board (10) is electrically connected to the battery cell.

10. An electrical device, characterized in that, include: A battery assembly, wherein the battery assembly is the battery assembly according to claim 9.

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