Battery protection plate and battery assembly

Abstract

The utility model provides a battery protection plate and a battery assembly, and relates to the technical field of battery protection plates. According to the battery protection board provided by the invention, the electric connection mode of the battery protection board and the tabs of the battery cell does not adopt a nickel sheet in the prior art any more, but adopts the conductive part integrally formed with the board main body of the flexible circuit board in the flexible circuit board, and the projection of the printed circuit board on the board main body does not coincide with the conductive part. Therefore, the space, occupied by the nickel sheet, on the printed circuit board is saved, meanwhile, the conductive part and the board main body are of an integrated structure, the conductive part and the board main body do not need to be connected in other connection modes such as welding, the production procedure for producing the battery protection board is saved, and the production efficiency of the battery protection board is improved.

Description

Technical Field

[0001] This application relates to the field of battery protection board technology, and in particular to a battery protection board and battery assembly. Background Technology

[0002] In the current electronic equipment industry, battery cells are usually welded to the battery protection board by nickel sheets, and then insulated and encapsulated to form a battery. However, nickel sheets usually occupy a large area of ​​the protection board, especially in products with multiple cells. Multiple nickel sheets occupy a large area of ​​the protection board, which means that the nickel sheets and components need to be placed on opposite sides. The overall thickness of the battery protection board includes the thickness of the nickel sheets, which occupies the capacity space of the battery cells. Utility Model Content

[0003] In view of this, this application provides a battery protection board and a battery assembly, with the aim of solving the above-mentioned technical problems to a certain extent.

[0004] A first aspect of this application provides a battery protection board, the battery protection board comprising:

[0005] A printed circuit board, wherein a protection circuit is provided on the printed circuit board;

[0006] A flexible circuit board, comprising an integrally formed board body and a conductive portion, wherein the board body is electrically connected to the printed circuit board, the conductive portion is located on one side of the board body in the width direction, and the projection of the printed circuit board onto the board body does not coincide with the conductive portion.

[0007] Preferably, the printed circuit board has a thickness direction, and the printed circuit board includes a first surface and a second surface that are opposite to each other in the thickness direction;

[0008] The plate body includes a third surface and a fourth surface that are opposite to each other in the thickness direction;

[0009] The battery protection board also includes a conductive layer sandwiched between the first surface and the third surface, and the conductive layer electrically connects the board body and the printed circuit board.

[0010] Preferably, the board body has an overhang portion extending beyond the printed circuit board on one side in the width direction, and the conductive portion is disposed on the overhang portion.

[0011] Preferably, the extended portion extends at a predetermined angle to the third or fourth surface of the plate body, and the extended portion extends beyond the third or fourth surface in the thickness direction.

[0012] Preferably, the conductive portion extends from the third surface at the preset angle for a length of 2.0 mm to 20 mm.

[0013] Preferably, the battery protection board further includes a plurality of components forming the protection circuit, the plurality of components being disposed on the second surface.

[0014] Preferably, the battery protection board further includes a first encapsulation body, which covers the second surface;

[0015] And / or, the portion of the first package that covers the conductive portion, and the portion of the conductive portion that is not covered by the first package that is used for electrical connection of the tab.

[0016] Preferably, there are multiple conductive parts, and the multiple conductive parts are spaced apart along the length direction of the plate body.

[0017] A second aspect of this application provides a battery assembly, the battery assembly including the battery protection board as described above;

[0018] The battery cell has tabs that are electrically connected to the conductive part of the battery protection board.

[0019] Preferably, the battery assembly further includes a second package that covers the head of the battery cell and the outer side of the battery protection plate.

[0020] According to the battery protection board provided in this application, the electrical connection between the battery protection board and the battery cell's tabs no longer uses the nickel sheet found in the prior art. Instead, it uses a conductive part integrally formed with the main body of the flexible circuit board, and the projection of the conductive part does not coincide with the main body of the printed circuit board. This saves space on the printed circuit board that would otherwise be occupied by the nickel sheet. Furthermore, since the conductive part and the main body are an integral structure, there is no need for additional connection methods such as welding between the conductive part and the main body, saving production steps in the battery protection board manufacturing process and improving production efficiency.

[0021] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of a two-dimensional view of a battery protection board provided according to an embodiment of this application is shown.

[0024] Figure 2 A schematic diagram showing a three-dimensional view of a battery protection board provided according to an embodiment of this application is shown.

[0025] Figure 3 A schematic diagram of an exploded view of a battery protection board provided according to an embodiment of this application is shown.

[0026] Figure 4 A schematic diagram of a two-dimensional view of a battery protection board provided according to an embodiment of this application when the conductive portion is not bent is shown.

[0027] Figure 5 A schematic diagram of a two-dimensional view of a battery protection board provided according to an embodiment of this application when the conductive part is bent is shown.

[0028] Figure 6 A schematic diagram of a two-dimensional circuit board of a battery protection board provided according to an embodiment of this application is shown.

[0029] Figure 7 A schematic diagram of a two-dimensional printed circuit board of a battery protection board provided according to an embodiment of this application is shown.

[0030] Figure 8 A schematic cross-sectional view of an example printed circuit board of a battery assembly provided according to an embodiment of this application is shown.

[0031] Figure 9 A schematic cross-sectional view of yet another example of a printed circuit board for a battery assembly provided according to an embodiment of this application is shown.

[0032] Figure 10 A schematic cross-sectional view of yet another example of a printed circuit board for a battery assembly provided according to an embodiment of this application is shown.

[0033] Figure 11 A schematic cross-sectional view of yet another example of a printed circuit board for a battery assembly provided according to an embodiment of this application is shown.

[0034] Figure 12 A schematic cross-sectional view of yet another example of a printed circuit board for a battery assembly provided according to an embodiment of this application is shown.

[0035] Figure 13 A schematic cross-sectional view of yet another example of a printed circuit board for a battery assembly provided according to an embodiment of this application is shown.

[0036] Figure 14A schematic cross-sectional view of yet another example of a printed circuit board for a battery assembly provided according to an embodiment of this application is shown.

[0037] Figure 15 A schematic cross-sectional view of yet another example of a printed circuit board for a battery assembly provided according to an embodiment of this application is shown.

[0038] Figure label:

[0039] 100 - Printed circuit board; 110 - First surface; 120 - Second surface;

[0040] 200 - Flexible circuit board; 210 - Board body; 211 - Third surface; 212 - Fourth surface; 220 - Conductive part; 300 - Conductive layer; 310 - Solder pad;

[0041] 400 - Components; 500 - First package;

[0042] 600 - Battery cell; 610 - Tab; 700 - Second package; 800 - Thickness direction; 900 - Length direction. Detailed Implementation

[0043] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. 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.

[0044] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0047] According to a first aspect of the embodiments of this application, a battery protection board is provided, which will be described below in conjunction with... Figures 1 to 7 Describe in detail the structure and working principle of the battery protection board.

[0048] According to the battery protection board provided in the embodiments of this application, the battery protection board includes a printed circuit board 100 and a flexible circuit board 200. In the embodiments, a protection circuit is provided on the printed circuit board 100, and the flexible circuit board 200 includes an integrally formed board body 210 and a conductive part 220. The board body 210 is electrically connected to the printed circuit board 100, and the conductive part 220 is located on one side of the board body 210 in the width direction. The projection of the printed circuit board 100 on the board body 210 does not coincide with the conductive part 220.

[0049] Thus, according to the battery protection board provided in this application embodiment, the electrical connection between the battery protection board and the tab 610 of the cell 600 no longer uses the nickel sheet in the prior art, but can use the conductive part 220 integrally formed with the board body 210 of the flexible circuit board 200. Since the projection of the printed circuit board 100 on the board body 210 does not coincide with the conductive part 220, that is, the conductive part 220 does not occupy the space on the printed circuit board 100, thus saving the space on the printed circuit board 100 that should have been occupied by the nickel sheet. At the same time, since the conductive part 220 and the board body 210 are an integral structure, there is no need for the conductive part 220 and the board body 210 to be connected by other connection methods such as welding, saving production steps in the production of the battery protection board and improving the production efficiency of the battery protection board.

[0050] In the embodiments, as mentioned above, the "integral board body 210 and conductive part 220" means that the board body 210 and the conductive part 220 are integral in the flexible circuit board 200, and are two parts of the flexible circuit board 200 as a whole, without the seam structure formed by the "other connection method" mentioned above. Therefore, once the flexible circuit board 200 is manufactured, it naturally has the aforementioned conductive part 220, and there is no process of connecting the separate conductive structure and board structure to form the conductive part 220 and the board body 210 during its production process.

[0051] In the embodiments, the printed circuit board 100 can be substantially formed as a PCB (Printed Circuit Board), and the flexible circuit board 200 can be substantially formed as an FPC (Flexible Printed Circuit Board).

[0052] In the embodiments, the printed circuit board 100 and the flexible circuit board 200 can be electrically connected by soldering using pads 310 pre-formed on the two boards, or by using a conductive structure between the two boards to electrically connect them. The latter electrical connection method will be described in the following description.

[0053] Furthermore, the protection circuit can be an existing protection circuit, which is an existing structure and will not be elaborated here.

[0054] In the embodiment, the fact that the projection of the printed circuit board 100 on the board body 210 does not coincide with the conductive part 220 should be understood to include the following meaning: along the direction perpendicular to the board body 210, the projection of the printed circuit board 100 on the board body 210 does not coincide with the conductive part 220, so the conductive part 220 will not occupy the space on the printed circuit board 100.

[0055] According to the battery protection board provided in the embodiments of this application, the printed circuit board 100 may have a thickness direction 800, and the printed circuit board 100 may include a first surface 110 and a second surface 120 that are opposite to each other in the thickness direction 800. In the embodiments, the board body 210 may include a third surface 211 and a fourth surface 212 that are opposite to each other in the thickness direction 800. The battery protection board may also include a conductive layer 300, which is sandwiched between the first surface 110 and the third surface 211, and the conductive layer 300 can electrically connect the printed circuit board 100 and the flexible circuit board 200.

[0056] In this embodiment, the conductive layer 300 sandwiched between the printed circuit board 100 and the flexible circuit board 200 is the "second electrical connection method" mentioned above. In this embodiment, the conductive layer 300 essentially serves both a mechanical connection and an electrical connection. However, its mechanical connection differs from the laser welding performed on the two boards in the prior art, thus avoiding the laser welding process and the defects that may be caused by laser welding. At the same time, it eliminates the process area space for welding the flexible circuit board 200 to the printed circuit board 100, thereby improving the component layout space.

[0057] According to the battery protection board provided in the embodiments of this application, in the embodiments, the conductive layer 300 can be formed, for example, as a conductive adhesive film. Specifically, the conductive adhesive film can be, for example, an anisotropic conductive adhesive film. In the embodiments, see... Figure 6 and Figure 7Multiple required pads 310 can be pre-fabricated on the first surface 110, and multiple pads 310 corresponding to the aforementioned pads 310 can be pre-fabricated on the third surface 211. Conductive positions corresponding to the aforementioned pads 310 can be created in the anisotropic conductive adhesive film, and then the conductive positions of the conductive adhesive film are used to connect the corresponding pads 310 on both sides of the conductive position, thereby electrically connecting the printed circuit board 100 and the flexible circuit board 200.

[0058] In the embodiments, according to the battery protection board provided in this application, the conductive layer 300 can be formed as a solid layer cured from a colloid or paste. As an example, in the embodiments, the conductive layer 300 can be, for example, a fixed layer cured from solder paste. Similar to the connection method of the conductive adhesive film described above, in the embodiments, based on the pads 310 provided on the two boards, a stencil (exposing the pads 310 on the board when the stencil is covering the board) can be used to cover the board, and then solder paste is brushed on the outside of the stencil, so that the pads 310 are all covered with solder paste. Then, the other board is aligned with the first board, and the solder paste is dried and cured in an oven to connect the two boards together.

[0059] According to the battery protection board provided in the embodiments of this application, the board body 210 may further include a side portion extending between the third surface 211 and the fourth surface 212, and the conductive portion 220 is located on the side portion.

[0060] Thus, according to the battery protection board provided in this application embodiment, since the conductive portion 220 is located on the side of the board body 210, the conductive portion 220 will not occupy the dimension of the board body 210 in the thickness direction 800, which reduces the overall dimension of the battery protection board in the thickness direction 800. In the embodiment, as an example, the conductive portion 220 may be, for example, a sheet-like structure that extends outward from the side of the board body 210.

[0061] According to the battery protection board provided in the embodiments of this application, in the embodiments, the board body 210 has an overhang portion extending beyond the printed circuit board on one side in the width direction, and a conductive portion is disposed on the overhang portion.

[0062] The above example is not shown in the accompanying drawings. In this example, considering that the conductive portion 220 does not occupy the first surface 110 and the second surface 120 of the printed circuit board 100, the conductive portion 220 can also be disposed on the portion of the board body 210 that extends beyond the printed circuit board 100 in the width direction. As a further example, the conductive portion 220 can also be a sheet-like structure as mentioned above and located on the side of the extended portion.

[0063] Furthermore, in some examples of the battery protection board provided according to embodiments of this application, the conductive portion 220 can be disposed on the portion of the third surface 211 that extends beyond the third surface. That is, in this example, the conductive portion 220 can be the area where the outer edge of the conductive portion is in contact with the board body 210 (in fact, the two are an integral structure without a boundary), and this area can be located on the third surface 211, with the corresponding position being the extended portion. Alternatively, or simultaneously, the conductive portion 220 can also be disposed on the portion of the fourth surface 212 that extends beyond the fourth surface. For example, when there are multiple conductive portions 220, some conductive portions 220 can be located on the portion of the fourth surface 212 that extends beyond the fourth surface, and other conductive portions 220 can be located on the portion of the third surface 211 that extends beyond the third surface 110. According to the battery protection board provided according to embodiments of this application, the conductive portion 220 can extend at a predetermined angle to the third surface 211 to extend beyond the first surface 110.

[0064] Thus, according to the battery protection board provided in the embodiments of this application, the above-described extension of the conductive portion 220 helps to reduce the external area occupied by the battery protection board. In the embodiments, the conductive portion 220 is equivalent to... Figures 1 to 4 Based on the arrangement of the conductive portion 220, it is bent toward the side where the first surface 110 is located. The bent conductive portion 220 can, for example, be shaped as follows: Figure 5 The extended posture in the middle. As an example, the third surface 211 can be, for example, a plane, and the conductive part 220 can be, for example, at an obtuse angle to the third surface 211 or Figure 5 A right angle in. In other words, in Figure 5 In the given example, the conductive part 220 can be perpendicular to the board body 210, and it can also be perpendicular to the printed circuit board 100.

[0065] According to the battery protection board provided in the embodiments of this application, the side of the conductive portion 220 away from the printed circuit board 100 can be used for electrical connection with the tab 610. In the embodiments, the tab 610 can be connected to the circuit board 100 by means such as soldering. Figure 5 The right side of the conductive part 220, that is, the outer side of the conductive part 220.

[0066] See here for further details. Figure 8 and Figure 10Regardless of whether the first surface 110 of the printed circuit board 100 faces the cell 600 or the second surface 120 faces the cell 600, in this embodiment, the tab 610 can extend laterally along the gap between the printed circuit board 100 and the cell 600, and then bend further toward the outside of the conductive portion 220 in a direction away from the cell 600. This means that, due to the bending of the conductive portion 220, the extension direction of the part of the tab 610 that is electrically connected to the tab 610 is the same as the extension direction of the conductive portion 220, so that the size of the battery protection board in the thickness direction 800 will not be increased after the soldering is completed.

[0067] According to the battery protection board provided in the embodiments of this application, the length of the conductive portion 220 extending at a predetermined angle to the third surface 211 can be from 2.0 mm to 20 mm. This length can essentially be the height of the bent conductive portion 220 in the above vertical example, which ensures that the conductive portion 220 can provide sufficient space for welding the tab 610. As an example, this height can be, for example, 2.0 mm, 3.0 mm, 4.0 mm, or 5.0 mm or even greater.

[0068] In an embodiment, the conductive portion 220 of the battery protection board provided according to the present application embodiment may have a sheet-like structure, and the thickness of the conductive portion 220 is 0.1 mm to 1 mm. As an example, the thickness of the conductive portion 220 is sufficient to ensure that the conductive portion 220 will not be broken down when the tab 610 is soldered to the conductive portion 220. In an embodiment, the thickness of the conductive portion 220 may be, for example, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm or greater.

[0069] According to the battery protection board provided in the embodiments of this application, the battery protection board may further include a plurality of components 400 forming the protection circuit as described above, and the plurality of components 400 are disposed on the second surface 120. In the embodiments, these components 400 may include, for example, IC (Integrated Circuit, i.e., a chip) and MOS (i.e., MOSFET, Metal-Oxide-Semiconductor Field-Effect Transistor) components 400.

[0070] According to the battery protection board provided in the embodiments of this application, the battery protection board may further include a first package 500. The first package 500 may cover the outer side of a portion of the conductive portion 220, the outer side of the aforementioned plurality of components 400, and the outer side of the second surface 120. The side of the conductive portion 220 away from the printed circuit board 100 is exposed for electrical connection of the tab 610. As an example, the first package 500 may be formed, for example, by injection molding of PUR (Polyurethane Reactive), UV (Ultraviolet), or PA (Polyamide) materials, or by injection molding of EMC (Epoxy Molding Compound), or by 3D printing.

[0071] However, in the example not shown, the first package may only cover the outer side of the second surface, or the first package may only cover the outer side of the aforementioned portion of the conductive part 220.

[0072] According to the battery protection board provided in the embodiments of this application, the number of conductive portions 220 can be multiple, and the multiple conductive portions 220 can be spaced apart along the length direction 900 of the board body. The conductive portions 220 may include, for example, a first conductive portion 220 and a second conductive portion 220. The first conductive portion 220 and the second conductive portion 220 can be spaced apart from each other, for example, along the aforementioned length direction 900. The tabs 610 may include a positive tab 610 and a negative tab 610. The first conductive portion 220 can be used for electrical connection with the positive tab 610, and the second conductive portion 220 can be used for electrical connection with the negative tab 610. See also... Figures 1 to 3 The number of first conductive parts 220 can be, for example, two, and the number of second conductive parts 220 can also be, for example, two.

[0073] A battery assembly provided according to an embodiment of this application includes the battery protection board as described above, and also includes the beneficial effects described above, which will not be repeated here.

[0074] According to the battery assembly provided in the embodiments of this application, the battery assembly may further include a battery cell 600. The tab 610 of the battery cell 600 can be electrically connected to the conductive part 220. The connection method has been described above and will not be repeated here.

[0075] According to the battery assembly provided in the embodiments of this application, the battery assembly may further include a second encapsulation body 700. The second encapsulation body 700 may cover the outer side of the head of the battery cell 600 and the outer side of the battery protection plate. The material and forming method of the second encapsulation body 700 may be the same as those of the first encapsulation body 500, and will not be described again here. In the embodiments, the first encapsulation body 500 described above can improve the strength of the battery protection plate and provide insulation performance for the battery protection plate. Here, the second encapsulation body 700 can improve the strength of the battery protection plate and the battery cell 600 as a whole and provide insulation performance for the battery assembly. Based on this example, the following will be combined with Figures 8 to 15 Describe a specific packaging example of the battery assembly.

[0076] In an embodiment, the battery assembly may include a plurality of battery cells 600, which may be electrically connected to a plurality of conductive portions 220 corresponding to each other. As an example, as mentioned above, the conductive portion 220 may include, for example, a first conductive portion and a second conductive portion. The first conductive portion may be used for welding to the positive electrode tab of the battery cell 600, and the second conductive portion may be used for welding to the negative electrode tab of the battery cell 600. Thus, each battery cell 600 may be provided with a pair of first and second conductive portions. Therefore, in the example where the battery assembly includes a plurality of battery cells 600, multiple pairs of first and second conductive portions are provided in a one-to-one correspondence with the aforementioned plurality of battery cells 600.

[0077] like Figure 3 As shown, in this embodiment, the first conductive portion and the second conductive portion can be arranged adjacent to each other, and the two pairs of first conductive portions and second conductive portions can be spaced apart in the length direction as described above. In this embodiment, as an example, the printed circuit board 100, the flexible circuit board 200, and the conductive layer 300 can each have corresponding notches, which are used to avoid the sealing edges of adjacent battery cells 600. In this embodiment, corresponding to the positions between adjacent battery cells 600, the printed circuit board 100, the flexible circuit board 200, and the conductive layer 300 are all provided with the aforementioned notches, and on both sides of the notches are respectively arranged two pairs of first conductive portions and second conductive portions corresponding to the two battery cells 600.

[0078] Reference Figure 3 , Figure 3 An opening as shown above is provided in the middle. Figure 3 In the given example, there can be two cells 600, with two pairs of first conductive parts and second conductive parts respectively.

[0079] like Figure 8 As shown, Figure 8 The example shown is a battery protection board and a battery cell 600 placed horizontally, with the component 400 facing away from the battery cell 600. In this example, the first package 500 and the second package 700 are not provided in the battery assembly.

[0080] like Figure 9 As shown, Figure 9 The image shows an example of the battery protection board and battery cell 600 placed horizontally. Figure 8 Based on this, in this example, the battery assembly is provided with a second package 700, but the first package 500 is not provided.

[0081] like Figure 10 As shown, Figure 10 The example shown is a battery protection board and a battery cell 600 placed horizontally, with the component 400 facing the battery cell 600. In this example, the first package 500 and the second package 700 are not provided in the battery assembly.

[0082] like Figure 11 As shown, Figure 11 The image shows an example of the battery protection board and battery cell 600 placed horizontally. Figure 10 Based on this, in this example, the battery assembly is provided with a second package 700, but the first package 500 is not provided.

[0083] like Figure 12 As shown, Figure 12 The example shown is a battery protection board and a battery cell 600 placed horizontally, with components 400 facing away from the battery cell 600. In this example, the battery assembly is provided with a first package 500, but no second package 700 is provided.

[0084] like Figure 13 As shown, Figure 13 The illustration shows an example where the battery protection board and battery cell 600 are placed horizontally, with component 400 facing away from battery cell 600. Figure 12 Based on this, in this example, the battery assembly is provided with a first package 500 and a second package 700.

[0085] like Figure 14 As shown, Figure 14 The example shown is a battery protection board and a battery cell 600 placed horizontally, with the component 400 facing the battery cell 600. In this example, a first package 500 is provided in the battery assembly, but a second package 700 is not provided.

[0086] like Figure 15 As shown, Figure 14 The illustration shows an example where the battery protection board and battery cell 600 are placed horizontally, with component 400 facing the battery cell 600. Figure 14 Based on this, in this example, a first package 500 and a second package 700 are provided in the battery assembly.

[0087] Furthermore, in an example not shown, compared to a conventional battery protection board solution where the nickel sheet and components 400 are placed on opposite sides, the battery protection board and battery assembly provided according to the embodiments of this application can save head thickness space when the battery protection board and the cell 600 are placed horizontally; and can save battery length space when the battery protection board and the cell 600 are placed vertically (not shown in the figure).

[0088] According to an embodiment of this application, an electronic device is provided. The electronic device includes the battery assembly as described above, and also has the beneficial effects described above, which will not be repeated here. The electronic device may be, for example, a mobile phone.

[0089] The above are merely preferred embodiments of this application and do not limit the scope of protection of this application. Any equivalent structural transformations made based on the innovative concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A battery protection board, characterized in that, The battery protection board includes: A printed circuit board, wherein a protection circuit is provided on the printed circuit board; A flexible circuit board, comprising an integrally formed board body and a conductive portion, wherein the board body is electrically connected to the printed circuit board, the conductive portion is located on one side of the board body in the width direction, and the projection of the printed circuit board onto the board body does not coincide with the conductive portion.

2. The battery protection board according to claim 1, characterized in that, The printed circuit board has a thickness direction, and the printed circuit board includes a first surface and a second surface that are opposite to each other in the thickness direction; The plate body includes a third surface and a fourth surface that are opposite to each other in the thickness direction; The battery protection board also includes a conductive layer sandwiched between the first surface and the third surface, and the conductive layer electrically connects the board body and the printed circuit board.

3. The battery protection board according to claim 2, characterized in that, The board body has a portion extending beyond the printed circuit board on one side in the width direction, and the conductive portion is disposed on the extended portion.

4. The battery protection board according to claim 3, characterized in that, The extended portion extends at a predetermined angle to the third or fourth surface of the plate body, and the extended portion extends beyond the third or fourth surface in the thickness direction.

5. The battery protection board according to claim 4, characterized in that, The conductive portion extends from the third surface at the preset angle for a length of 2.0 mm to 20 mm.

6. The battery protection board according to claim 2, characterized in that, The battery protection board also includes a plurality of components forming the protection circuit, and the plurality of components are disposed on the second surface.

7. The battery protection board according to claim 6, characterized in that, The battery protection board further includes a first package, which covers the second surface; And / or, the portion of the first package that covers the conductive portion, and the portion of the conductive portion that is not covered by the first package that is used for electrical connection of the tab.

8. The battery protection board according to claim 1, characterized in that, The number of conductive parts is multiple, and the multiple conductive parts are spaced apart along the length direction of the plate body.

9. A battery assembly, characterized in that, The battery assembly includes a battery protection board as described in any one of claims 1 to 8; The battery cell has tabs that are electrically connected to the conductive part of the battery protection board.

10. The battery assembly according to claim 9, characterized in that, The battery assembly also includes a second encapsulation body, which covers the head of the battery cell and the outer side of the battery protection plate.

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