Battery protection plate, battery and electric device

Abstract

The application discloses a battery protection plate, a battery and a power consumption equipment. The battery protection plate comprises a substrate, an electrical element and a heat dissipation structure. A windowed area for exposing a metal layer is arranged on the surface of the substrate. The electrical element is arranged on the surface of the substrate and is arranged adjacent to the windowed area. The metal layer is used for transferring the heat of the electrical element. The heat dissipation structure comprises a heat dissipation protrusion arranged on the windowed area. The heat dissipation protrusion is in heat conduction contact with the metal layer, so that the heat generated by the electrical element is conducted to the outside of the battery protection plate through the metal layer and the heat dissipation protrusion. Since the heat dissipation protrusion can effectively increase the heat dissipation area, the heat on the metal layer can be quickly conducted to the external air, so that the heat dissipation efficiency of the battery protection plate is improved, the problem that the battery protection plate is damaged due to untimely heat dissipation is avoided, and the performance of the battery protection plate is improved.

Description

Technical Field

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

[0002] Currently, most electronic devices such as mobile phones and laptops are powered by batteries. The battery usually has an integrated battery protection board, which can protect the battery during charging and discharging to avoid problems such as overcharging, over-discharging, and short circuits.

[0003] In related technologies, battery protection boards are equipped with electrical components such as MOS (MOSFET, metal-oxide-semiconductor field-effect transistor) and resistors. These electrical components generate a lot of heat when they are working. If they cannot be dissipated in time, they will have a significant impact on the performance of the battery protection board, and may even cause damage to the battery protection board. Therefore, there is an urgent need to propose a solution that can improve the heat dissipation efficiency of the battery protection board. Utility Model Content

[0004] This application discloses a battery protection board, a battery, and an electrical device to solve the problem of low heat dissipation efficiency in battery protection boards in related technologies.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows: In a first aspect, embodiments of this application disclose a battery protection board, which includes a substrate, electrical components, and a heat dissipation structure; The substrate has a window area on its surface for exposing a metal layer. The electrical component is disposed on the surface of the substrate and is adjacent to the window area. The metal layer is used to transfer heat from the electrical component. The heat dissipation structure includes a heat dissipation protrusion located in the window area. The heat dissipation protrusion is in thermal contact with the metal layer so that the heat generated by the electrical components is conducted out of the battery protection board via the metal layer and the heat dissipation protrusion.

[0006] Secondly, embodiments of this application disclose a battery, which includes a battery cell and the battery protection board described in the first aspect, wherein the battery protection board is electrically connected to the battery cell.

[0007] Thirdly, embodiments of this application disclose an electrical device, which includes a device housing and the battery described in the third aspect, wherein the battery is installed in the device housing.

[0008] The technical solution adopted in this application can achieve the following technical effects: The battery protection board, battery, and electrical device disclosed in this application improve upon related technologies. By providing a window area on the surface of the substrate to expose the metal layer, the heat generated by the electrical components can be promptly transferred to the metal layer through the thermally conductive interaction between the metal layer and the electrical components. Furthermore, heat dissipation protrusions are provided in the window area, making thermal contact with the metal layer. Since the heat dissipation protrusions effectively increase the heat dissipation area, the heat on the metal layer can be quickly transferred to the outside air, thereby improving the heat dissipation efficiency of the battery protection board and preventing damage due to insufficient heat dissipation, thus enhancing the performance of the battery protection board. Attached Figure Description

[0009] Figure 1 This is one of the structural schematic diagrams of the battery protection board disclosed in the embodiments of this application; Figure 2 This is a second schematic diagram of the structure of the battery protection board disclosed in the embodiments of this application; Figure 3 This is the third schematic diagram of the battery protection board disclosed in the embodiments of this application; Figure 4 This is the fourth schematic diagram of the battery protection board disclosed in the embodiments of this application.

[0010] Explanation of reference numerals in the attached figures: 100 - Substrate, 101 - First surface, 102 - Second surface, 110 - Window area 200-Electrical Components 300 - Heat dissipation structure, 310 - Heat dissipation protrusion, 320 - Heat dissipation hole. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0012] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and are not limited in number; for example, a first object can be one or more.

[0013] The technical solutions disclosed in the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0014] Please refer to Figures 1 to 4 This application discloses a battery protection board, which is used to electrically connect with the battery cell and can protect the battery cell during the charging and discharging process to prevent the battery cell from being in overcharged, over-discharged, overcurrent, short circuit, or over-temperature charging and discharging state.

[0015] The aforementioned battery protection board may include a substrate 100, electrical components 200, and a heat dissipation structure 300. The substrate 100 is the basic component of the battery protection board, providing a mounting base for the electrical components 200 and the heat dissipation structure 300. The substrate 100 can be a PCB (Printed Circuit Board) or an FPC (Flexible Printed Circuit). The surface of the substrate 100 has a window area 110 for exposing the metal layer. The window area 110 refers to a window formed in the solder resist layer (green or other colored ink layer) on the surface of the substrate 100 to expose the metal layer beneath the solder resist layer. The metal layer can be a copper foil layer, a tin foil layer, etc. Electrical components 200 are disposed on the surface of substrate 100. The surface of substrate 100 has reserved pads for soldering electrical components 200. The electrical components 200 can be MOSFETs, resistors, etc. Window area 110 is disposed adjacent to electrical components 200, and electrical components 200 do not cover window area 110. Metal layer can be used to transfer heat from electrical components 200. In other words, the heat generated by electrical components 200 can be transferred to metal layer through heat exchange. Metal layer can further conduct heat to the air outside the battery protection board.

[0016] It should be noted that the aforementioned metal layer can be electrically connected to the grounding or power supply pins of the electrical component 200. Since the current flowing through the pins of the electrical component 200 is relatively large and the heat generated is also relatively large, the metal layer can both conduct current and dissipate heat. Of course, the metal layer and the electrical component 200 can also be electrically isolated, with the metal layer only placed relatively close to the electrical component 200, and the two can still achieve thermal conductivity.

[0017] In actual heat dissipation, the contact area between the metal layer and the outside air directly affects the heat dissipation efficiency. Simply put, the larger the contact area between the metal layer and the outside air, the higher the heat dissipation efficiency. Therefore, the heat dissipation efficiency can be improved by increasing the contact area. Specifically, the heat dissipation structure 300 may include a heat dissipation protrusion 310 disposed in the window area 110. The heat dissipation protrusion 310 may be made of metal, such as copper or tin, or it may be made of heat-dissipating ceramic or other materials. The heat dissipation protrusion 310 can make thermally conductive contact with the metal layer and can be connected to the metal layer by welding, hot-melt connection, or other methods. The heat generated by the electrical component 200 can be conducted to the air outside the battery protection board through the metal layer and the heat dissipation protrusion 310. Since the heat dissipation protrusion 310 is a three-dimensional structure with a large surface area, the contact area between the heat dissipation protrusion 310 and the outside air can be effectively increased compared to the metal layer, thereby improving the heat dissipation efficiency.

[0018] As described above, the battery protection board disclosed in this application improves upon related technologies. By providing a window area 110 on the surface of the substrate 100 to expose the metal layer, the heat generated by the electrical component 200 can be promptly conducted to the metal layer through the thermally conductive cooperation between the metal layer and the electrical component 200. Then, a heat dissipation protrusion 310 is provided in the window area 110, which is in thermal contact with the metal layer. Since the heat dissipation protrusion 310 can effectively increase the heat dissipation area, the heat on the metal layer can be quickly conducted to the external environment, thereby improving the heat dissipation efficiency of the battery protection board and preventing damage to the battery protection board due to untimely heat dissipation, thus improving the performance of the battery protection board.

[0019] like Figure 2 As shown, to further increase the contact area between the heat dissipation protrusion 310 and the external air, in this embodiment, the number of heat dissipation protrusions 310 can be multiple, and these multiple heat dissipation protrusions 310 are spaced apart from each other, enabling each heat dissipation protrusion 310 to have sufficient contact with the external air. Furthermore, within the window area 110, the multiple heat dissipation protrusions 310 can be arranged in an array, which can include at least two columns of heat dissipation protrusions 310, and each column can contain two, three, or more heat dissipation protrusions 310. It should be noted that the aforementioned window area 110 can be composed of multiple sub-regions, which are spaced apart from each other, and each sub-region is provided with multiple heat dissipation protrusions 310. The window area 110 can be located between two adjacent columns of electrical components 200, simultaneously meeting the heat dissipation needs of both columns of electrical components 200.

[0020] The heat dissipation protrusion 310 can be cylindrical, hemispherical, or similar in shape. In this embodiment, the surface of the heat dissipation protrusion 310 is arc-shaped. The arc-shaped design can maximize the contact area between the heat dissipation protrusion 310 and the external air, thereby improving heat dissipation efficiency. On the other hand, it can prevent the surface of the heat dissipation protrusion 310 from cracking due to stress concentration, thus improving durability.

[0021] In addition, to further improve heat dissipation efficiency, a textured structure, such as wave patterns or bumps, can be set on the surface of the heat dissipation protrusion 310 to further increase the contact area between the heat dissipation protrusion 310 and the external air.

[0022] Along the direction perpendicular to the surface of the substrate 100, the height of the heat dissipation protrusion 310 can be 0.15mm-0.5mm, specifically 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.4mm, 0.5mm, etc. The appropriate height of the heat dissipation protrusion 310 can be selected by taking into account parameters such as the size of the battery cell and the thickness of the substrate 100.

[0023] In one optional embodiment of this application, the substrate 100 may have a first surface 101 and a second surface 102 facing away from each other. The electrical component 200, the window area 110, and the heat dissipation protrusion 310 are all disposed on the first surface 101 of the substrate 100. Furthermore, the electrical component 200 has a heat dissipation surface opposite to the first surface 101 of the substrate 100, which may be a region of the electrical component 200 that generates a relatively large amount of heat. To achieve timely and effective heat dissipation on the heat dissipation surface, in this embodiment, the heat dissipation structure 300 may further include a heat dissipation hole 320 formed in the substrate 100. The heat dissipation hole 320 penetrates both the first surface 101 and the second surface 102 of the substrate 100. The heat dissipation hole 320 is disposed opposite to the heat dissipation surface. Therefore, the heat on the heat dissipation surface can be conducted to the outside of the battery protection board through the heat dissipation hole 320. The specific heat conduction path is: heat dissipation surface → first surface 101 of the substrate 100 → heat dissipation hole 320 → second surface 102 of the substrate 100 → outside air.

[0024] When using the heat dissipation holes 320 to dissipate heat from the electrical component 200, heat conduction is mainly achieved through the air inside the holes 320. However, considering the low thermal conductivity of air, the heat dissipation efficiency of the holes 320 is relatively low. To improve the heat dissipation efficiency of the holes 320, in this embodiment, a thermally conductive medium can be filled inside the holes 320. The thermal conductivity of the medium is higher than that of air, enabling faster heat transfer. The thermally conductive medium can be a metallic material such as copper or tin, or a non-metallic material such as graphene or ceramics. The thermally conductive medium can be used to transfer heat from the heat dissipation surface. In other words, the heat generated on the heat dissipation surface of the electrical component 200 can be transferred to the thermally conductive medium through heat exchange. The thermally conductive medium can further conduct the heat to the outside of the heat dissipation holes 320, thereby achieving more efficient heat conduction and further improving the heat dissipation efficiency.

[0025] It should be noted that, in actual manufacturing, taking metal materials as an example, solder paste or copper paste can be injected into the heat dissipation holes 320 through grouting. The thermally conductive medium can directly contact the heat dissipation surface to achieve more efficient heat dissipation; alternatively, an insulating component can be placed between the thermally conductive medium and the heat dissipation surface, or the thermally conductive medium and the heat dissipation surface can be spaced apart to achieve electrical isolation, which can improve the safety of the electrical component 200 and avoid problems such as short circuits.

[0026] The number of the aforementioned heat dissipation holes 320 can be one, two, or more (more than two), for example, such as Figure 3 and Figure 4 As shown, each electrical component 200 has four heat dissipation holes 320 below it. The four heat dissipation holes 320 are arranged in an array, which can fully cover the heat dissipation surface of the electrical component 200 and effectively improve the heat dissipation efficiency.

[0027] In this embodiment, the diameter of the heat dissipation hole 320 can be 0.3mm-1mm, specifically 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1mm, etc. When designing the heat dissipation hole 320, the heat dissipation hole 320 with the corresponding diameter can be selected according to the size of the substrate 100 and the electrical component 200. This application embodiment does not limit this.

[0028] This application also discloses a battery, which may include a battery cell and the battery protection board mentioned above. The battery protection board can be electrically connected to the battery cell. Specifically, the battery protection board can be electrically connected to the tabs of the battery cell. The tabs of the battery cell are metal conductors that lead out the positive and negative electrodes from the battery cell. The connection method between the battery protection board and the tabs of the battery cell can be welding, conductive bonding, etc.

[0029] As described above, the battery protection board in the battery disclosed in this application improves upon related technologies by providing a window area 110 on the surface of the substrate 100 to expose the metal layer. Utilizing the thermally conductive interaction between the metal layer and the electrical component 200, the heat generated by the electrical component 200 can be promptly transferred to the metal layer. Then, a heat dissipation protrusion 310 is provided in the window area 110, which makes thermal contact with the metal layer. Since the heat dissipation protrusion 310 effectively increases the heat dissipation area, the heat on the metal layer can be quickly transferred to the external environment, thereby improving the heat dissipation efficiency of the battery protection board and preventing damage due to insufficient heat dissipation, thus improving the performance of the battery protection board.

[0030] This application also discloses an electrical device, which can be a battery-powered electronic product such as a mobile phone, tablet computer, television, smart wearable products (e.g., smartwatch, smart bracelet), virtual reality terminal device, augmented reality terminal device, etc. The aforementioned electrical device can also be a rechargeable small household appliance (e.g., a soymilk maker, a robot vacuum cleaner), drone, etc. This application does not impose any special limitations on the specific form of the aforementioned terminal.

[0031] The aforementioned electrical equipment may include a housing and the battery described above, with the battery installed in the housing.

[0032] As described above, the battery protection board in the electrical equipment disclosed in this application improves upon related technologies by providing a window area 110 on the surface of the substrate 100 to expose the metal layer. Utilizing the thermally conductive interaction between the metal layer and the electrical component 200, the heat generated by the electrical component 200 can be promptly transferred to the metal layer. Furthermore, a heat dissipation protrusion 310 is provided in the window area 110, which makes thermal contact with the metal layer. Since the heat dissipation protrusion 310 effectively increases the heat dissipation area, the heat on the metal layer can be quickly transferred to the external environment, thereby improving the heat dissipation efficiency of the battery protection board and preventing damage due to insufficient heat dissipation, thus enhancing the performance of the battery protection board.

[0033] The above embodiments of this application focus on describing the differences between the various embodiments. As long as the different technical features between the various embodiments are not contradictory, they can be combined to form more specific embodiments. For the sake of brevity, they will not be described in detail here.

[0034] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A battery protection board, characterized in that, It includes a substrate (100), electrical components (200), and a heat dissipation structure (300). The substrate (100) has a window area (110) on its surface for exposing a metal layer. The electrical component (200) is disposed on the surface of the substrate (100) and is disposed adjacent to the window area (110). The metal layer is used to transfer heat from the electrical component (200). The heat dissipation structure (300) includes a heat dissipation protrusion (310) disposed in the window area (110), the heat dissipation protrusion (310) being in thermal contact with the metal layer so that the heat generated by the electrical component (200) is conducted out of the battery protection board through the metal layer and the heat dissipation protrusion (310).

2. The battery protection board according to claim 1, characterized in that, The number of heat dissipation protrusions (310) is multiple, and the multiple heat dissipation protrusions (310) are spaced apart from each other and arranged in an array within the window area (110).

3. The battery protection board according to claim 1, characterized in that, The surface of the heat dissipation protrusion (310) is curved.

4. The battery protection board according to claim 1, characterized in that, The height of the heat dissipation protrusion (310) is 0.15mm-0.5mm along a direction perpendicular to the surface of the substrate (100).

5. The battery protection board according to claim 1, characterized in that, The substrate (100) has a first surface (101) and a second surface (102) facing away from each other. The electrical component (200) is disposed on the first surface (101) and the electrical component (200) has a heat dissipation surface opposite to the first surface (101). The heat dissipation structure (300) further includes heat dissipation holes (320) formed on the substrate (100). The heat dissipation holes (320) penetrate the first surface (101) and the second surface (102) and are disposed opposite to the heat dissipation surface so that the heat on the heat dissipation surface is conducted out of the battery protection board through the heat dissipation holes (320).

6. The battery protection board according to claim 5, characterized in that, The heat dissipation hole (320) is filled with a thermally conductive medium, which is used to transfer heat from the heat dissipation surface.

7. The battery protection board according to claim 5, characterized in that, The number of heat dissipation holes (320) is multiple, and the multiple heat dissipation holes (320) are arranged in an array.

8. The battery protection board according to claim 5, characterized in that, The diameter of the heat dissipation hole (320) is 0.3mm-1mm.

9. A battery, characterized in that, It includes a battery cell and a battery protection board as described in any one of claims 1-8, wherein the battery protection board is electrically connected to the battery cell.

10. An electrical appliance, characterized in that, It includes a device housing and the battery as described in claim 9, wherein the battery is installed in the device housing.

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