Battery protection plate and manufacturing method thereof

Abstract

The invention relates to a battery protection plate and a manufacturing method thereof, and the battery protection plate comprises a protection plate main body, the surface of the protection plate main body is provided with a plurality of bonding pads; the metal reinforcing sheet comprises a first welding surface and a second welding surface which are opposite in direction, and the first welding surface is welded with the bonding pad; and the plastic package layer is arranged on the surface of the protection plate main body, and the plastic package layer is provided with a window corresponding to the second welding surface. The bending resistance and stress resistance of the structure can be improved, the cleanliness of the welding surface is guaranteed, a circuit structure is avoided, and the product quality is effectively improved.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a battery protection plate and a manufacturing method thereof. Background Art

[0002] Soft-pack batteries are lithium-ion batteries that use aluminum-plastic film as the outer shell. They have the advantages of light weight, small size, and variable shape. They are widely used in portable electronic devices such as mobile phones and tablets. The packaging PACK of soft-pack batteries refers to the process of assembling the battery cell with components such as the protection board and connecting wires into a whole. The protection board is an important component used to monitor and control the working state of the battery cell to prevent abnormal situations such as overcharging, over-discharging, and short circuits. Common protection boards include SIP (System InPackage) packaging and COB (Chip On Board) packaging. SIP packaging refers to integrating the protection chip and other devices on a hard board PCB, and then plastic-sealing the devices on the hard board to form an independent module.

[0003] The conventional SIP protection board and the battery cell are connected by a nickel connector. Therefore, after the protection board is injection molded, the pad part where the nickel connector is welded needs to be unsealed. Since the metal layer on the surface of the pad is relatively thin, if the energy of unsealing is too large, it is easy to damage the surface of the pad or the secondary circuit structure, resulting in abnormal product function. If the energy of unsealing is insufficient, the injection molding material on the surface of the pad cannot be cleaned up, which is equivalent to the presence of foreign matter on the surface of the pad. There is a risk of solder rejection and cold soldering for the secondary patch nickel connector. In addition, after injection molding, partial unsealing will cause the injection molding material and the PCB board to have no support, and it is relatively fragile in terms of stress resistance. Therefore, during the bending test process or the process of spot welding the pole ears during assembly, cracks or breaks are likely to occur at the intersection of the unsealing. Summary of the invention

[0004] The object of the present invention is to provide a battery protection plate and a manufacturing method thereof, which can improve the bending resistance and stress resistance of the structure, ensure the cleanliness of the welding surface, avoid line structure, and effectively improve product quality.

[0005] A battery protection board, comprising: A protection plate body, wherein a plurality of welding pads are provided on the surface of the protection plate body; a metal reinforcement sheet, the metal reinforcement sheet comprising a first welding surface and a second welding surface facing oppositely, the first welding surface being welded to the welding pad; and The plastic sealing layer is arranged on the surface of the protection plate body, and the plastic sealing layer is provided with a window corresponding to the second welding surface.

[0006] In the above technical solution, a metal reinforcement sheet is welded on the surface of the pad, and the metal reinforcement sheet is located between the plastic sealing layer and the main body of the protective plate, which can improve the bending resistance and stress resistance of the structure. When the plastic sealing layer is unsealed, due to the protection of the metal reinforcement sheet, more energy can be used to avoid residual sealing material caused by unclean unsealing, ensure the cleanliness of the second welding surface, and thus avoid the risk of solder rejection and cold solder joints when welding structural parts. Since all the unsealing energy acts on the metal reinforcement sheet, the energy will not damage the secondary circuit, thereby protecting the secondary circuit intact and avoiding functional abnormalities of the product.

[0007] Furthermore, the size of the metal reinforcement sheet is larger than the size of the pad, so that the periphery of the metal reinforcement sheet extends to the outside of the pad and is sandwiched between the plastic sealing layer and the protection plate body.

[0008] In the above technical solution, the size of the metal reinforcement sheet is larger than the size of the solder pad, so that the periphery of the metal reinforcement sheet extends to the outside of the solder pad, and the periphery of the metal reinforcement sheet is pressed between the plastic sealing layer and the protective plate body, thereby forming a support between the plastic sealing layer and the protective plate body, thereby improving the bending stress resistance of the protective plate body.

[0009] Furthermore, a structural component is welded to the second welding surface.

[0010] In the above technical solution, the structural member is welded via the second welding surface, so that the stability of the welding can be ensured.

[0011] Furthermore, the structural member is a nickel connecting sheet.

[0012] In the above technical solution, the protection board and the battery cell can be connected through the nickel connecting sheet.

[0013] Furthermore, the first welding surface and the second welding surface are both provided with a copper plating layer.

[0014] In the above technical solution, based on the characteristics of easy combination of copper and tin, a copper plating layer is provided on the first welding surface and the second welding surface, which can respectively improve the bonding strength between the first welding surface and the pad, and the bonding strength between the second welding surface and the structural member, thereby further improving the stability and reliability of the structure.

[0015] Furthermore, the metal reinforcement sheet is a nickel sheet.

[0016] In the above technical solution, the metal reinforcement sheet is made of nickel sheet, which can ensure the structural strength and facilitate copper plating on the first welding surface and the second welding surface.

[0017] A method for manufacturing the battery protection plate as described above comprises the following steps: S1. Provide a protection plate body, wherein a plurality of welding pads are provided on the surface of the protection plate body; S2. Provide metal reinforcement sheet; S3, welding a metal reinforcement sheet on the pad; S4, performing injection molding on the protection plate body to form a plastic sealing layer on the surface of the protection plate body; S5. Unseal the plastic sealing layer at a position corresponding to the metal reinforcing sheet to form a window.

[0018] In the above technical solution, a metal reinforcement sheet is first welded on the surface of the pad, and then injection molding is performed, so that the metal reinforcement sheet is located between the plastic sealing layer and the main body of the protective plate, which can improve the bending resistance and stress resistance of the structure. When the plastic sealing layer is unsealed, due to the protection of the metal reinforcement sheet, more energy can be used to avoid residual injection material caused by unclean unsealing, ensure the cleanliness of the second welding surface, and thus avoid the risk of solder rejection and cold solder joints when welding structural parts. Since all the unsealing energy acts on the metal reinforcement sheet, the energy will not damage the sub-layer circuit, thereby protecting the sub-layer circuit intact and avoiding product functional abnormalities.

[0019] Furthermore, the step S2 includes copper plating the surface of the metal reinforcement sheet.

[0020] In the above technical solution, copper plating on the surface of the metal reinforcement sheet can improve the bonding strength between the metal reinforcement sheet and the pad and the structural member, thereby improving the stability and reliability of the structure.

[0021] Furthermore, in step S4, the injection molding material is an epoxy resin injection molding compound.

[0022] Furthermore, after the step S5 is completed, the method further includes: S6, welding structural parts on the surface of the metal reinforcement sheet.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: a metal reinforcement sheet is welded on the surface of the pad, and the metal reinforcement sheet is located between the plastic sealing layer and the main body of the protective plate, which can improve the bending resistance and stress resistance of the structure. When the plastic sealing layer is unsealed in the subsequent step, due to the protection of the metal reinforcement sheet, more energy can be used to avoid residual sealing material caused by unclean unsealing, ensure the cleanliness of the second welding surface, and thus avoid the risk of solder rejection and cold solder joints when welding structural parts. Since the unsealing energy is all applied to the metal reinforcement sheet, the energy will not damage the sub-layer circuit, thereby protecting the sub-layer circuit intact and avoiding functional abnormalities of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of a battery protection board according to an embodiment of the present invention.

[0025] Figure 2 for Figure 1 A partial enlarged schematic diagram of .

[0026] Figure 3 It is a schematic diagram of the structure of a battery protection plate and structural parts according to an embodiment of the present invention.

[0027] Figure 4 Schematic diagram of the structure of a metal reinforcement sheet according to an embodiment of the present invention.

[0028] Figure 5 The present invention is a flow chart of a method for manufacturing a battery protection plate.

[0029] Description of Figure Numbers: The protection plate body 1 , the soldering pad 11 , the metal reinforcing sheet 2 , the first soldering surface 21 , the second soldering surface 22 , the copper plating layer 23 , the plastic sealing layer 3 , the window 31 , and the structural member 4 . DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The drawings show preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein.

[0031] Please refer to Figures 1 to 4 In a preferred embodiment, the present invention provides a battery protection board, including a protection board body 1, a metal reinforcement sheet 2, and a plastic sealing layer 3. The protection board body 1 can adopt an existing PCB board, and a plurality of pads 11 are provided on the surface of the protection board body 1, wherein the pads 11 are used to weld external structural parts 4, such as connecting sheets.

[0032] The metal reinforcement sheet 2 is a thin sheet of metal. In this embodiment, the metal reinforcement sheet 2 is preferably a nickel sheet. In other possible embodiments, the metal reinforcement sheet 2 can be other conductive metals or alloys. The metal reinforcement sheet 2 includes a first welding surface 21 and a second welding surface 22 facing oppositely. The first welding surface 21 faces the protection plate body 1 and is welded to the pad 11, so that the metal reinforcement sheet 2 is fixed to the surface of the protection plate body 1.

[0033] The plastic encapsulation layer 3 is disposed on the surface of the protection board body 1, and the plastic encapsulation layer 3 is provided with a window 31 corresponding to the second welding surface 22. It should be noted that the plastic encapsulation layer 3 is formed by an injection molding process, and preferably adopts EMC (Epoxy Molding Compound), which can provide good packaging protection for the protection board body 1, and wrap the protection board body 1 in a strong and durable outer layer, which helps to prevent damage to electronic devices by external environmental factors such as dust, moisture, and vibration.

[0034] It can be seen from the above technical solution that the metal reinforcement sheet 2 is welded on the surface of the pad 11, and the metal reinforcement sheet 2 is located between the plastic sealing layer 3 and the protective plate body 1, which can improve the bending resistance and stress resistance of the structure. When the plastic sealing layer 3 is unsealed, due to the protection of the metal reinforcement sheet 2, more energy can be used to avoid the residual sealing material caused by unclean unsealing, ensure the cleanliness of the second welding surface 22, and then avoid the risk of solder rejection and cold soldering when welding the structural part 4. Since the unsealing energy is all applied to the metal reinforcement sheet 2, the energy will not damage the sub-layer circuit, thereby protecting the sub-layer circuit intact and avoiding the occurrence of product functional abnormalities.

[0035] In this embodiment, the size of the metal reinforcement sheet 2 is larger than that of the pad 11, so that the periphery of the metal reinforcement sheet 2 extends to the outside of the pad 11 and is sandwiched between the plastic sealing layer 3 and the protective plate body 1. In specific implementation, the shape of the metal reinforcement sheet 2 can match the shape of the pad 11. When the metal reinforcement sheet 2 is welded to the pad 11, the distance from the periphery of the metal reinforcement sheet 2 to the periphery of the pad 11 is close or the same, thereby ensuring that the metal reinforcement sheet 2 is more evenly stressed after plastic sealing.

[0036] By setting the size of the metal reinforcement sheet 2 to be larger than the size of the pad 11, the periphery of the metal reinforcement sheet 2 extends to the outside of the pad 11, and the periphery of the metal reinforcement sheet 2 is pressed between the plastic sealing layer 3 and the protection plate body 1, thereby forming a support between the plastic sealing layer 3 and the protection plate body 1, thereby improving the bending stress resistance of the protection plate body 1.

[0037] The second welding surface 22 is welded with a structural member 4, which is used to connect external components. In this embodiment, the structural member 4 is a nickel connecting piece, which is L-shaped and is used to electrically connect the protection board body 1 and the battery cell. By welding the structural member 4 through the second welding surface 22, the stability of the welding can be ensured.

[0038] In this embodiment, the first welding surface 21 and the second welding surface 22 are both provided with a copper plating layer 23. According to the characteristics that copper and tin are easily combined, the copper plating layer 23 is provided on the first welding surface 21 and the second welding surface 22, which can respectively improve the bonding force between the first welding surface 21 and the pad 11, and the bonding force between the second welding surface 22 and the structural member 4, further improving the stability and reliability of the structure.

[0039] Please refer to Figure 5 The present invention also provides a method for manufacturing the battery protection plate as described above, comprising the following steps: S1. Provide a protection plate body 1, wherein a plurality of welding pads 11 are disposed on the surface of the protection plate body 1.

[0040] In step S1 , the protection board body 1 may adopt an existing PCB board, and the pads 11 are used to weld the external structural parts 4 , such as the connecting piece. In this embodiment, there are two pads 11 , but it is not limited thereto.

[0041] S2. Provide a metal reinforcement sheet 2.

[0042] In step S2 , the metal reinforcement sheet 2 may be a nickel sheet. The shape of the metal reinforcement sheet 2 is preferably the same as that of the pad 11 , and the size of the metal reinforcement sheet 2 is larger than that of the pad 11 .

[0043] S3, welding the metal reinforcement sheet 2 on the welding pad 11; In step S3 , during welding, the center of the pad 11 is aligned with the center of the metal reinforcing sheet 2 so that the periphery of the metal reinforcing sheet 2 extends to the outside of the pad 11 .

[0044] S4 , injection molding is performed on the protection plate body 1 to form a plastic sealing layer 3 on the surface of the protection plate body 1 .

[0045] In step S4, during injection molding, the outer periphery of the metal reinforcement sheet 2 is pressed between the plastic sealing layer 3 and the protection plate body 1, thereby forming a support between the two and improving the bending resistance of the structure.

[0046] S5 , unsealing the plastic sealing layer 3 at a position corresponding to the metal reinforcing sheet 2 to form a window 31 .

[0047] In step S5 , the size of the window 31 is the same as that of the pad 11 , thereby ensuring that the structural member 4 can fully contact the metal reinforcement sheet 2 and that the periphery of the metal reinforcement sheet 2 can be sandwiched between the plastic sealing layer and the protection plate body 1 .

[0048] In this embodiment, step S2 includes copper plating the surface of the metal reinforcement sheet 2. Copper plating the surface of the metal reinforcement sheet 2 can improve the bonding force between the metal reinforcement sheet 2 and the pad 11 and the structural member 4, and enhance the stability and reliability of the structure.

[0049] In this embodiment, the injection molding material of step S4 is an epoxy resin injection molding compound. The epoxy resin injection molding compound can provide good packaging protection for the protection board body 1, wrapping the protection board body 1 in a strong and durable outer layer, which helps to prevent damage to the electronic device by external environmental factors such as dust, moisture, and vibration.

[0050] After step S5 is completed, the method further includes: S6, welding a structural member 4 on the surface of the metal reinforcing sheet 2. The member is used to connect external components. In this embodiment, the structural member 4 is a nickel connecting sheet, which is L-shaped and is used to electrically connect the protection board body 1 and the battery cell. By welding the structural member 4 through the second welding surface 22, the stability of the welding can be ensured.

[0051] In the description of the present invention, it should be understood that terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0053] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery protection board, characterized in that: include: A protection plate body, wherein a plurality of welding pads are provided on the surface of the protection plate body; a metal reinforcement sheet, the metal reinforcement sheet comprising a first welding surface and a second welding surface facing oppositely, the first welding surface being welded to the welding pad; and The plastic sealing layer is arranged on the surface of the protection plate body, and the plastic sealing layer is provided with a window corresponding to the second welding surface.

2. The battery protection board according to claim 1, characterized in that: The size of the metal reinforcement sheet is larger than that of the pad, so that the periphery of the metal reinforcement sheet extends to the outside of the pad and is sandwiched between the plastic sealing layer and the protection plate body.

3. The battery protection board according to claim 1, characterized in that: The second welding surface is welded with a structural component.

4. The battery protection board according to claim 3, characterized in that: The structural member is a nickel connecting sheet.

5. The battery protection board according to claim 1, characterized in that: The first welding surface and the second welding surface are both provided with a copper plating layer.

6. The battery protection board according to claim 1, characterized in that: The metal reinforcement sheet is a nickel sheet.

7. A method for manufacturing a battery protection plate according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Provide a protection plate body, wherein a plurality of welding pads are provided on the surface of the protection plate body; S2. Provide metal reinforcement sheet; S3, welding a metal reinforcement sheet on the pad; S4, performing injection molding on the protection plate body to form a plastic sealing layer on the surface of the protection plate body; S5. Unseal the plastic sealing layer at a position corresponding to the metal reinforcing sheet to form a window.

8. The method for manufacturing a battery protection plate according to claim 7, characterized in that: The step S2 includes copper plating the surface of the metal reinforcement sheet.

9. The method for manufacturing a battery protection plate according to claim 7, characterized in that: In the step S4, the injection molding material is an epoxy resin injection molding compound.

10. The method for manufacturing a battery protection plate according to claim 7, characterized in that: After the step S5 is completed, the method further includes: S6, welding a structural part on the surface of the metal reinforcement sheet.

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