Battery protection board, battery assembly and electric equipment

Abstract

The utility model provides a battery protection board, a battery assembly and electric equipment. The battery protection board comprises a PCB (Printed Circuit Board) on which components and a flexible circuit board are mounted; at least part of the connecting block is arranged on one side, in the width direction, of the PCB, the connecting block is used for being welded to a tab of a battery cell of the battery assembly, the connecting block is provided with at least two welding faces, and the welding faces are used for being welded to the PCB. According to the utility model, the problem that in the prior art, the nickel sheet occupies a large space on the protection plate in order to ensure the welding strength is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery protection board, a battery assembly and an electrical device. Background Art

[0002] In the current mobile phone battery industry, the battery cell is welded to the nickel sheet of the protection plate, and then insulated and packaged to form a battery. However, in the existing technical solution, the protection plate PCM is placed vertically to the battery cell. In order to ensure the welding strength of the protection plate, the nickel sheet and the pole ear will occupy multiple layers of length space in the length direction. In other words, the nickel sheet usually occupies a large area of ​​the protection plate, especially in multiple battery cell projects. Multiple nickel sheets occupy a large area of ​​the protection plate, which requires the nickel sheet and components to be placed on different surfaces, resulting in an increase in the overall thickness of the PCM and occupying the battery cell capacity space.

[0003] As can be seen from the above, in the prior art, there is a problem that the nickel sheet occupies a large space on the protection plate in order to ensure the welding strength. Utility Model Content

[0004] The main purpose of the utility model is to provide a battery protection board, a battery assembly and an electrical device to solve the problem in the prior art that the nickel sheet occupies a large space on the protection board in order to ensure the welding strength.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a battery protection board is provided, including: a PCB board, on which components and a flexible circuit board are installed; a connecting block, at least a part of the connecting block is arranged on one side of the PCB board along the width direction, and is used for welding with the tabs of the battery cells of the battery assembly, and the connecting block has at least two welding surfaces, and the welding surfaces are used for welding with the PCB board.

[0006] Furthermore, the connecting block has an avoidance notch portion, and at least a portion of the PCB board is accommodated in the avoidance notch portion and is welded and fixed to at least two inner wall surfaces of the avoidance notch portion.

[0007] Furthermore, the avoidance notch is located at the corners of the connecting block so that the cross section of the connecting block is L-shaped, and the top surface and side surfaces of the avoidance notch are welding surfaces and are respectively welded and fixed to the top surface and side surfaces of the PCB board.

[0008] Furthermore, the avoidance notch is located on the side of the connecting block facing the PCB board, so that the cross-section of the connecting block is U-shaped, and the top, side and bottom surfaces of the avoidance notch are welding surfaces and are respectively welded and fixed to the top, side and bottom surfaces of the PCB board.

[0009] Furthermore, a mounting notch is provided on one side of the PCB board, and at least a portion of the connecting block is welded in the mounting notch.

[0010] Furthermore, the mounting notch has a bottom surface and a first inner wall surface and a second inner wall surface opposite to each other along the length direction of the PCB board; along the width direction of the PCB board, the width of the first inner wall surface and the second inner wall surface is the same as the width of the connecting block, and at least two of the bottom surface, the first inner wall surface and the second inner wall surface of the mounting notch are welded and fixed to the welding surface of the connecting block.

[0011] Furthermore, along the length direction of the PCB board, the length of the bottom surface of the installation notch is the same as the length of the connecting block, and the bottom surface of the installation notch, the first inner wall surface and the second inner wall surface are all welded and fixed to the welding surface of the connecting block.

[0012] Furthermore, the height h of the connecting block is greater than or equal to 0.2 mm; and / or the width w of the connecting block is greater than or equal to 0.2 mm.

[0013] Furthermore, there are a plurality of connection blocks, which are grouped in pairs, and the two connection blocks in a group are respectively welded to the positive electrode ear and the negative electrode ear of the battery cell.

[0014] Furthermore, the battery protection board also includes a first injection molding structure, which is formed on the battery protection board and is used to cover the battery protection board.

[0015] According to another aspect of the utility model, a battery assembly is provided, including a battery cell and the above-mentioned battery protection plate, wherein a connecting block is welded to the tab of the battery cell.

[0016] Furthermore, the battery assembly also includes a second injection molding structure, and the second injection molding structure covers the head of the battery cell and the battery protection plate.

[0017] According to another aspect of the utility model, there is provided an electrical device comprising the above-mentioned battery assembly.

[0018] According to the technical solution of the utility model, the battery protection board includes a PCB board and a connecting block, components and a flexible circuit board are installed on the PCB board, at least a part of the connecting block is arranged on one side of the PCB board along the width direction, and is used for welding with the pole ear of the battery cell of the battery assembly, and the connecting block has at least two welding surfaces, and the welding surfaces are used for welding with the PCB board. In this way, the connecting block is placed on the side of the PCB board through the block-shaped connection structure, so that the connecting block does not occupy the length space in the direction of the components, thereby reducing the overall thickness of the PCM, and reserving space for increasing the capacity of the battery cell, thereby improving customer experience, and at the same time, the at least two welding surfaces of the connecting block are welded to the PCB board, thereby ensuring that there is a sufficient welding area between the connecting block and the PCB board, and then having sufficient welding strength, thereby solving the problem in the prior art that the nickel sheet occupies a large space on the protection board in order to ensure welding strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 An exploded view of a battery protection board in a specific embodiment of the utility model is shown;

[0021] Figure 2 A schematic diagram showing the structure of the connection between the battery protection board and the battery cell in a specific embodiment of the utility model is shown;

[0022] Figure 3 A cross-sectional view of a battery protection board in a specific embodiment of the utility model is shown;

[0023] Figure 4 A schematic diagram showing the structure of the connection between the battery protection board and the battery cell in another specific embodiment of the utility model is shown;

[0024] Figure 5 A cross-sectional view of a battery protection board in another specific embodiment of the utility model is shown;

[0025] Figure 6 A schematic structural diagram of a first injection molding structure in a specific embodiment of the utility model is shown;

[0026] Figure 7 A schematic structural diagram of a second injection molding structure in a specific embodiment of the utility model is shown;

[0027] Figure 8 A schematic structural diagram of a first injection molding structure and a second injection molding structure in a specific embodiment of the utility model is shown;

[0028] Fig. 9 A schematic diagram showing the structure of a battery assembly in a specific embodiment of the utility model is shown;

[0029] Fig.10 The figure shows a schematic structural diagram of an electric device in a specific embodiment of the utility model.

[0030] The above drawings include the following reference numerals:

[0031] 10. PCB board; 11. Installation notch; 20. Connection block; 30. Components; 40. Flexible circuit board; 50. First injection molding structure; 60. Second injection molding structure; 70. Battery cell; 71. Tab; 100. Battery assembly; 1000. Electrical equipment. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0034] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0035] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0036] In order to solve the problem in the prior art that the nickel sheet occupies a large space on the protection plate in order to ensure the welding strength, the utility model provides a battery protection plate, a battery assembly and an electrical device. Among them, the battery assembly includes the battery protection plate. The electrical device includes the battery assembly.

[0037] like Figures 1 to 3 As shown, the battery protection board includes a PCB board 10 and a connection block 20. Components 30 and a flexible circuit board 40 are mounted on the PCB board 10. At least part of the connection block 20 is arranged on one side of the PCB board 10 along the width direction, and is used to be welded with the tab 71 of the battery cell 70 of the battery assembly. The connection block 20 has at least two welding surfaces, and the welding surfaces are used to be welded with the PCB board 10.

[0038] The battery protection board includes a PCB board 10 and a connecting block 20, and the PCB board 10 is installed with components 30 and a flexible circuit board 40. At least a part of the connecting block 20 is arranged on one side of the PCB board 10 along the width direction, and is used for welding with the pole ear 71 of the battery cell 70 of the battery assembly. The connecting block 20 has at least two welding surfaces, and the welding surface is used for welding with the PCB board 10. In this way, by adopting a block-shaped connection structure, the connecting block 20 is arranged on the side of the PCB board 10, so that the connecting block 20 does not occupy the length space in the direction of the components 30, thereby reducing the overall thickness of the PCM, and reserving space for increasing the capacity of the battery cell 70, thereby improving customer experience. At the same time, the at least two welding surfaces of the connecting block 20 are welded to the PCB board 10, thereby ensuring that there is a sufficient welding area between the connecting block 20 and the PCB board 10, and thus having sufficient welding strength.

[0039] In the prior art, the use of nickel sheets and tabs would occupy three layers of space with a total length of 0.24 mm to 0.3 mm in the length direction. However, with the technical solution of the present application, the tab 71 of the battery cell 70 is welded to one side of the connecting block 20, for example, the outer side of the connecting block 20 facing away from the PCB board 10, and does not occupy the length space in the vertical direction, so that the length of the battery assembly is shortened by 0.24 mm to 0.3 mm.

[0040] In this embodiment, if Figure 2 As shown, the tab 71 of the battery cell 70 first extends horizontally outward and then bends upward, thereby being welded and fixed to the pad on the outer side of the connection block 20 .

[0041] In this embodiment, the connection block 20 is a metal conductive block, for example, it can be made of metal nickel, that is, the connection block 20 is a nickel block, or a nickel brick. The width direction of the connection block 20 is consistent with the width direction of the PCB board 10, the height direction of the connection block 20 is the direction in which the components 30 and the PCB board 10 are stacked, and the connection block 20 extends along the length direction of the PCB board 10. Of course, the connection block 20 can also be made of other materials such as metal aluminum, as long as it meets the welding requirements, and can be selected according to actual needs.

[0042] In this embodiment, the connecting block 20 has an avoidance notch portion, which can be welded to the PCB board 10. The avoidance notch portion extends along the length direction of the connecting block 20. At least a portion of the PCB board 10 is accommodated in the avoidance notch portion and is welded and fixed to at least two inner wall surfaces of the avoidance notch portion, that is, the inner wall surface of the avoidance notch portion and the PCB board 10 to which it is welded and fixed is a welding surface.

[0043] Specifically, Figure 3As shown, the avoidance notch is located at the corner of the connecting block 20, so that the cross section of the connecting block 20 is L-shaped. The top surface and side surface of the avoidance notch are welding surfaces and are respectively welded and fixed to the top surface and side surface of the PCB board 10. It can be understood that the avoidance notch in this embodiment extends to the bottom surface of the connecting block 20 and the side surface close to the PCB board 10, respectively, and the connecting block 20 is similar to being buckled on the upper edge of the side of the PCB board 10. Further, the side surface of the avoidance notch is the same length as the side surface of the PCB board 10, so that the bottom surface of the PCB board 10 is flush with the bottom surface of the connecting block 20 and the top surface of the avoidance notch is just welded with the top surface of the PCB board 10. In an optional embodiment, the top surface and side surface of the avoidance notch can be respectively welded and fixed to one side of the PCB board 10 in the width direction and one side in the length direction; further, the size of the connecting block 20 in the thickness direction of the PCB board 10 is consistent with the thickness of the PCB board 10, so as to be flush with the top and bottom surfaces of the PCB board 10.

[0044] In an optional embodiment, the avoidance notch is located on one side of the connection block 20 facing the PCB board 10, and the avoidance notch is provided at a local position on this side, for example, at the middle position, and the avoidance notch is formed concavely along the width direction of the PCB board 10 and in the direction toward the connection block 20, so that the cross section of the connection block 20 is U-shaped, and the top surface, side surface and bottom surface of the avoidance notch are respectively welded and fixed to the top surface, side surface and bottom surface of the PCB board 10. It can be understood that, relative to the above-mentioned L-shaped connection block 20, the avoidance notch in this embodiment is moved upward by a certain distance, so that the contact surface between the PCB board 10 and the connection block 20 is increased from two to three, further improving the welding strength between the PCB board 10 and the connection block 20.

[0045] In another embodiment of the present application, Figures 4 to 5 As shown, a mounting notch 11 is formed on the side of the PCB board 10 , and the connecting block 20 is welded in the mounting notch 11 .

[0046] Specifically, the mounting notch 11 has a bottom surface and a first inner wall surface and a second inner wall surface that are opposite to each other along the length direction of the PCB board 10. The width of the first inner wall surface and the second inner wall surface is the same as the width of the connecting block 20, that is, the mounting notch 11 is a square notch. At least two of the bottom surface, the first inner wall surface, and the second inner wall surface of the mounting notch 11 are welded and fixed to the connecting block 20. For example, the bottom surface and the first inner wall surface of the mounting notch 11 are welded and fixed to the connecting block 20. Through the above arrangement, the welding strength between the connecting block 20 and the PCB board 10 can be ensured, and because the connecting block 20 is accommodated in the mounting notch 11, the width of the PCB board 10 is narrowed, further reducing the overall occupied space of the battery protection board.

[0047] Further, the shape of the mounting notch 11 is adapted to the connection block 20. The length of the bottom surface of the mounting notch 11 is the same as the length of the connection block 20, that is, the mounting notch 11 is a square notch adapted to the shape of the connection block 20. The bottom surface, the first inner wall surface, and the second inner wall surface of the mounting notch 11 are all welded and fixed to the connection block 20. Through the above arrangement, the welding strength between the connection block 20 and the PCB board 10 can be further ensured.

[0048] like Figure 3 and Figure 5 As shown, in order for the pole ear 71 and the connecting block 20 to have sufficient spot welding area, the height h of the connecting block 20 is greater than or equal to 0.2mm. Preferably, the height h of the connecting block 20 is 1.2mm to 2mm. Further, in order to prevent the connecting block 20 from being penetrated during spot welding, the width w of the connecting block 20 is greater than or equal to 0.2mm. Preferably, the width w of the connecting block 20 is 0.2mm to 1mm. Through the above arrangement, while ensuring that the connecting block 20 has sufficient spot welding area and is not penetrated, it has a relatively small height and width, so that the overall height and width of the battery protection plate are small, reducing the overall space occupied by the battery protection plate. It can be understood that when the connecting block 20 has an avoidance notch portion, the width w of the connecting block 20 is the minimum width of the connecting block 20, that is, the distance between the side of the avoidance notch portion and the outer side of the connecting block 20.

[0049] In the present embodiment, there are a plurality of connection blocks 20, and the plurality of connection blocks 20 are arranged in groups of two, and the two connection blocks 20 in a group are respectively welded to the positive and negative pole ears of the battery cell 70. Specifically, the plurality of connection blocks 20 in the present embodiment are located on the same side of the PCB board 10. Of course, the plurality of connection blocks 20 are also located on different sides of the PCB board 10, for example, two connection blocks 20 in a group are respectively located on both sides of the PCB board 10 to reduce the possibility of contact between the positive and negative poles of the battery cell. Correspondingly, in the above optional embodiments, if there are a plurality of connection blocks 20, there are also a plurality of installation notches 11, and the plurality of installation notches 11 are arranged in a one-to-one correspondence with the plurality of connection blocks 20. When the plurality of connection blocks 20 are located on different sides of the PCB board 10, the plurality of installation notches 11 are also located on different sides of the PCB board 10. When there are multiple battery cells, the multiple battery cells have multiple pole ears. At this time, the two connecting blocks 20 in each group are welded to the positive pole ear and the negative pole ear of a battery cell, that is, a group of connecting blocks 20 corresponds to one battery cell one by one; when the battery cell is a battery cell with a multi-pole ear structure, such as a battery cell with four pole ears (for example, a battery cell with two positive pole ears and two negative pole ears), the two connecting blocks 20 in a group are connected to a positive pole ear and a negative pole ear in the four pole ears. At this time, two groups of connecting blocks 20 correspond to one four-pole ear battery cell.

[0050] In this embodiment, if Figure 6As shown, the battery protection board also includes a first injection molding structure 50, which is formed on the battery protection board and is used to cover the battery protection board. It can be understood that the first injection molding structure 50 is a PCM injection molding structure.

[0051] like Fig. 9 As shown, the present application also provides a battery assembly, including a battery cell 70 and the above-mentioned battery protection board, the battery protection board is located on one side of the battery cell 70, and the connecting block 20 is welded to the pole ear 71 of the battery cell 70.

[0052] In this embodiment, the battery cell 70 is a same-side tab battery cell, that is, the positive tab and the negative tab of the battery cell 70 are located on the same side of the battery cell 70, so as to facilitate welding with a group of connection blocks 20 of the battery protection board.

[0053] Specifically, the battery protection board in this embodiment corresponds to two battery cells 70. Accordingly, there are four connection blocks 20, which are divided into two groups, so as to be welded to the positive and negative electrodes of the two battery cells 70 respectively. Of course, the battery protection board can correspond to only one battery cell 70, or to more battery cells 70, which can be selected according to actual needs. In the case of multiple battery cells, the battery protection board will avoid the side sealing edge between the two battery cells accordingly, such as Fig. 9 As shown, this application will not go into too much detail.

[0054] In this embodiment, the battery assembly further includes a hot melt adhesive strip, which is disposed between the battery protection board and the battery cell 70 and is used for the battery protection board and the battery cell 70. Furthermore, a relief notch is provided in the middle of the PCB board 10 to avoid the connection between the ends of the two hot melt adhesive strips.

[0055] like Figure 7 As shown, the battery assembly further includes a second injection molding structure 60, and the second injection molding structure 60 covers the head of the battery cell 70 and the battery protection plate. It can be understood that the second injection molding structure 60 is a head injection molding structure.

[0056] Furthermore, in this embodiment, if Figure 8 As shown, the first injection molding structure 50 and the second injection molding structure 60 can also be provided at the same time. That is to say, the battery assembly in this embodiment can not only be applied to the conventional PACK packaging solution, but can also be combined with head injection molding, PCM injection molding, head injection molding + PCM injection molding, and the length is shortened by 0.24mm to 0.3mm, and space is reserved for the 70-liter capacity of the battery cell.

[0057] like Fig.10As shown, the present application also provides an electric device 1000, including the above-mentioned battery assembly 100. The battery assembly 100 described in the embodiment of the present application is applicable to various electric devices 1000 using the battery assembly 100. Specifically, the electric device 1000 can be a mobile phone, a portable device, a laptop computer, a vehicle, a ship, a spacecraft, an electric toy, an electric tool, etc. The embodiment of the present application does not impose any special restrictions on the above-mentioned electric device 1000.

[0058] From the above description, it can be seen that the above-mentioned embodiment of the utility model achieves the following technical effects: by setting the battery protection board including the PCB board 10 and the connecting block 20, the components 30 and the flexible circuit board 40 are installed on the PCB board 10, at least part of the connecting block 20 is arranged on one side of the PCB board 10 along the width direction, and is used for welding with the pole ear 71 of the battery cell 70 of the battery assembly, and the connecting block 20 has at least two welding surfaces, and the welding surface is used for welding with the PCB board 10. In this way, by adopting a block-shaped connection structure, the connecting block 20 is placed on the side of the PCB board 10, so that the connecting block 20 does not occupy the length space in the direction of the components 30, thereby reducing the overall thickness of the PCM, and reserving space for increasing the capacity of the battery cell 70, thereby improving customer experience, and at the same time, the at least two welding surfaces of the connecting block 20 are welded to the PCB board 10, thereby ensuring that there is a sufficient welding area between the connecting block 20 and the PCB board 10, and thus having sufficient welding strength.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0060] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0061] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery protection board, characterized in that: include: A PCB board (10), on which components (30) and a flexible circuit board (40) are mounted; A connection block (20), at least part of which is arranged on one side of the PCB (10) along the width direction and is used for welding with the tabs (71) of the battery cells (70) of the battery assembly, and the connection block (20) has at least two welding surfaces, and the welding surfaces are used for welding with the PCB (10).

2. The battery protection board according to claim 1, characterized in that: The connection block (20) has an escape notch portion, and at least a portion of the PCB board (10) is accommodated in the escape notch portion and is welded and fixed to at least two inner wall surfaces of the escape notch portion.

3. The battery protection board according to claim 2, characterized in that: The avoidance notch is located at the corner of the connection block (20), so that the cross section of the connection block (20) is L-shaped; the top surface and the side surface of the avoidance notch are the welding surfaces and are respectively welded and fixed to the top surface and the side surface of the PCB board (10).

4. The battery protection board according to claim 2, characterized in that: The avoidance notch portion is located on a side of the connection block (20) facing the PCB board (10), so that the cross section of the connection block (20) is U-shaped; the top surface, side surface and bottom surface of the avoidance notch portion are the welding surfaces and are respectively welded and fixed to the top surface, side surface and bottom surface of the PCB board (10).

5. The battery protection board according to claim 1, characterized in that: A mounting notch (11) is provided on one side of the PCB board (10), and at least a portion of the connecting block (20) is welded in the mounting notch (11).

6. The battery protection board according to claim 5, characterized in that: The mounting notch (11) comprises a bottom surface and a first inner wall surface and a second inner wall surface which are opposite to each other along the length direction of the PCB board (10); along the width direction of the PCB board (10), the widths of the first inner wall surface and the second inner wall surface are the same as the width of the connecting block (20); and at least two of the bottom surface of the mounting notch (11), the first inner wall surface and the second inner wall surface are fixedly welded to the welding surface of the connecting block (20).

7. The battery protection board according to claim 6, characterized in that: Along the length direction of the PCB board (10), the length of the bottom surface of the installation notch (11) is the same as the length of the connection block (20), and the bottom surface of the installation notch (11), the first inner wall surface and the second inner wall surface are all welded and fixed to the welding surface of the connection block (20).

8. The battery protection board according to claim 1, characterized in that: The height h of the connecting block (20) is greater than or equal to 0.2 mm; and / or The width w of the connecting block (20) is greater than or equal to 0.2 mm.

9. The battery protection board according to claim 1, characterized in that: There are a plurality of connection blocks (20), and the plurality of connection blocks (20) are grouped in pairs, and the two connection blocks (20) in a group are respectively welded to the positive electrode tab and the negative electrode tab of the battery cell (70).

10. The battery protection board according to claim 1, characterized in that: The battery protection board also includes a first injection molding structure (50), which is formed on the battery protection board and is used to cover the battery protection board.

11. A battery assembly, characterized in that: It comprises a battery cell (70) and a battery protection plate according to any one of claims 1 to 10, wherein the connection block (20) is welded to a pole ear (71) of the battery cell (70).

12. The battery assembly according to claim 11, characterized in that: The battery assembly further comprises a second injection molding structure (60), wherein the second injection molding structure (60) covers the head of the battery cell (70) and the battery protection plate.

13. An electrical equipment, characterized in that: A battery assembly comprising the battery assembly described in claim 11 or 12.

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