Heat dissipation structure, battery and electronic device

Abstract

The utility model discloses a heat dissipation structure, battery and electronic equipment, the heat dissipation structure for the protection circuit board of battery heat dissipation, the heat dissipation structure includes the phase change silicon grease layer and graphite layer of laminated arrangement, the phase change silicon grease layer is used for with the protection circuit board and is pasted. The above -mentioned scheme can solve the problem of the working performance and the service life of battery protection board that the battery of related art is caused because the heat dissipation capacity of protection circuit board is poor and is lower.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a heat dissipation structure, a battery, and an electronic device. Background Technology

[0002] With the increasing demands on battery performance from portable electronic devices (such as laptops, tablets, and smartphones), battery energy density and power output capabilities have become important indicators for evaluating their technological level. In related technologies, battery protection circuit boards primarily rely on air convection for heat dissipation. However, as battery energy density and power output capabilities increase, the heat generated by the protection circuit board during voltage monitoring and charge / discharge control also increases. Air convection alone is no longer sufficient to meet the heat dissipation requirements, thus affecting the performance and lifespan of the battery protection board. Utility Model Content

[0003] This utility model discloses a heat dissipation structure, a battery, and an electronic device to solve the problem in related technologies where the battery protection board has poor heat dissipation capacity, resulting in low performance and lifespan of the battery protection board.

[0004] To solve the above-mentioned technical problems, this utility model is implemented as follows: In a first aspect, this application discloses a heat dissipation structure for dissipating heat from a battery protection circuit board. The heat dissipation structure includes a phase change silicone grease layer and a graphite layer stacked together, wherein the phase change silicone grease layer is used to adhere to the protection circuit board.

[0005] Secondly, this application also discloses a battery, which includes a battery frame, a battery cell, a protection circuit board and the heat dissipation structure described in the first aspect. The protection circuit board and the battery cell are disposed at intervals on the battery frame and are electrically connected. The heat dissipation structure is stacked on the protection circuit board through the phase change silicone grease layer.

[0006] Thirdly, this application also discloses an electronic device, which includes a device body and the battery described in the second aspect, wherein the battery is disposed in the device body.

[0007] The technical solution adopted in this utility model can achieve the following technical effects: This embodiment of the application sets the heat dissipation structure to include a stacked phase change silicone grease layer and a graphite layer. When the heat dissipation structure is used in the battery to dissipate heat from the protective circuit board, the heat dissipation structure covers the protective circuit board with the phase change silicone grease layer. The heat of the protective circuit board is dissipated after passing through the phase change silicone grease layer and the graphite layer in sequence, thereby achieving heat dissipation for the protective circuit board. Since the heat dissipation structure absorbs the heat of the protective circuit board through the phase change silicone grease layer, after absorbing the heat of the protective circuit board and reaching the phase change temperature, the phase change silicone grease layer undergoes a phase change from solid to liquid. During this process, its temperature can absorb a large amount of heat without a significant increase, thereby cooling the protective circuit board. After the phase change grease layer becomes liquid, it fills the tiny gaps between the interface between the protective circuit board and the graphite layer, thereby increasing the contact area between them. This improves the thermal conductivity between the two layers, enhancing the circuit board's ability to transfer heat and thus addressing the issue of excessively high circuit board temperatures leading to reduced performance and lifespan of battery protection boards in related technologies. Furthermore, the phase change grease layer's good flexibility and compressibility provide cushioning protection for the circuit board under pressure. Attached Figure Description

[0008] Figure 1 This is an exploded view of a battery with a first heat dissipation structure as disclosed in an embodiment of the present utility model. Figure 2 This is an exploded view of a battery with a second heat dissipation structure as disclosed in an embodiment of the present utility model; Figure 3 This is an exploded view of the second heat dissipation structure disclosed in the embodiment of this utility model; Figure 4 This is an overall schematic diagram of the second heat dissipation structure disclosed in the embodiment of this utility model.

[0009] Explanation of reference numerals in the attached figures: 100-Protective Circuit Board 200-Heat dissipation structure, 201-First positioning hole, 202-Terminal clearance groove, 210-Phase change silicone grease layer, 220-Graphite layer, 230-Adhesive layer, 240-First protective film layer, 250-Second protective film layer. 300-battery frame, 400-cell, 500-package structure, 600 - Connection terminal. Detailed Implementation

[0010] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model 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 utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0011] The technical solutions disclosed in the various embodiments of this utility model are described in detail below with reference to the accompanying drawings.

[0012] Please refer to Figures 1 to 4 This utility model discloses a heat dissipation structure 200, which is used to dissipate heat from the battery protection circuit board 100.

[0013] The heat dissipation structure 200 includes a phase change grease layer 210 and a graphite layer 220 stacked together, wherein the phase change grease layer 210 is used to adhere to the protective circuit board 100.

[0014] To facilitate understanding, the characteristics of phase change grease and graphite are explained here. The thermal conductivity of phase change grease is typically between 3 W / m·K and 8 W / m·K. Phase change grease is solid at room temperature. After absorbing heat to reach its phase change temperature, it changes from solid to liquid. During this transition, it can absorb a significant amount of heat without a substantial increase in temperature. Once liquid, the grease can fill the tiny gaps at device interfaces, increasing the contact area between the grease and the device (e.g., the protective circuit board 100 described later), thus preventing heat loss due to air barriers. In its liquid state, the grease has a certain degree of adhesion and does not flow freely. Furthermore, it possesses insulating, flexible, and compressible properties.

[0015] Graphite layer 220 can be graphite sheet, which has good thermal conductivity. The thermal conductivity of graphite sheet on its extended plane is between 500 W / m•K and 1500 W / m•K, and the thermal conductivity in the direction perpendicular to the extended plane is between 10 W / m•K and 20 W / m•K. Moreover, graphite sheet has good flexibility, which meets the requirements of die-cutting, bending and other processes.

[0016] For example, the phase change grease layer 210 in this embodiment can be selected as a phase change grease with a thermal conductivity of 5 W / m·K, a withstand voltage of ≥1kV, a phase change temperature between 50-70℃, and properties such as self-adhesion or compatibility with adhesives. The thickness of the phase change grease layer 210 can be set to approximately 1mm. The graphite layer 220 in this embodiment can be selected as a graphite sheet with a thermal conductivity of ≥1000 W / m•K on the extended plane and a density between 1.0 g / cm³ and 2.2 g / cm³. The thickness of the graphite layer 220 can be set between 0.01mm and 0.3mm. It should be noted that all values ​​in this embodiment include both extreme values ​​of the numerical range.

[0017] In this embodiment, the heat dissipation structure 200 is configured to include a phase change silicone grease layer 210 and a graphite layer 220 stacked together. When the heat dissipation structure 200 is used in a battery to dissipate heat from the protective circuit board 100, the heat dissipation structure 200 covers the protective circuit board 100 through the phase change silicone grease layer 210. The heat of the protective circuit board 100 is dissipated after passing through the phase change silicone grease layer 210 and the graphite layer 220 in sequence, thereby achieving heat dissipation for the protective circuit board 100. Since the heat dissipation structure 200 absorbs the heat of the protective circuit board 100 through the phase change silicone grease layer 210, after absorbing the heat of the protective circuit board 100 and reaching the phase change temperature, the phase change silicone grease layer 210 undergoes a phase change from solid to liquid. During this process, its temperature can absorb a large amount of heat without a significant increase, thereby cooling the protective circuit board 100. After the phase change grease layer 210 becomes liquid, the liquid phase change grease layer 210 can fill the tiny gaps between the interface of the protective circuit board 100 and the graphite layer 220, thereby increasing the contact area between the phase change grease layer 210 and the protective circuit board 100, as well as the contact area between the phase change grease layer 210 and the graphite layer 220. This improves the thermal conductivity between the phase change grease layer 210 and the protective circuit board 100, and between the phase change grease layer 210 and the graphite layer 220, thus enhancing the ability of the protective circuit board 100 to transfer heat to the phase change grease layer 210 and the graphite layer 220. This solves the problem of excessively high temperature of the protective circuit board 100 in related technologies, which leads to low performance and lifespan of the battery protection board. Moreover, because the phase change grease layer 210 has good flexibility and compressibility, it can also provide cushioning protection for the protective circuit board 100 under pressure.

[0018] It should be noted that when the battery is used in electronic devices, the heat conducted from the protection circuit board 100 to the graphite layer 220 through the phase change grease layer 210 can be dissipated into the air, or the heat of the graphite layer 220 can be carried away by the heat dissipation device of the electronic device (such as a heat sink copper rod).

[0019] To prevent the phase change grease layer 210 from overflowing in a liquid state, a thixotropic agent can optionally be added to the phase change grease layer 210 to adjust its fluidity, thereby preventing overflow and improving its lifespan. After adding the thixotropic agent to the phase change grease layer 210, an overflow test can be performed (the heat dissipation structure 200 is placed at a 45° angle in an 85° environment for 24 hours, and the phase change grease layer 210 is observed to seep out).

[0020] Optionally, the phase change grease layer 210 can be connected to the graphite layer 220 through its own adhesion. Moreover, under the capillary action of the carbon fiber network of the graphite layer 220, the liquid phase change grease layer 210 can be locked to a certain extent, thereby preventing the phase change grease layer 210 from overflowing.

[0021] To improve the stability of the connection between the phase change grease layer 210 and the graphite layer 220, the heat dissipation structure 200 may optionally include an adhesive layer 230, through which the phase change grease layer 210 can be bonded to the graphite layer 220.

[0022] It should be noted that the adhesive layer 230 can be made of materials with high thermal conductivity and high temperature resistance. For example, the material of the adhesive layer 230 can be silicone-based or acrylic-based. The thermal conductivity of silicone-based or acrylic-based materials is ≥1.5 W / m•K, and they can withstand temperatures above 100℃ to prevent high-temperature delamination. The adhesive force is ≥1.5 N / cm² to ensure bonding stability.

[0023] The heat dissipation structure 200 disclosed in this application provides an adhesive layer 230, which allows the phase change grease layer 210 to be bonded to the graphite layer 220 through the adhesive layer 230, thereby improving the stability of the connection between the phase change grease layer 210 and the graphite layer 220.

[0024] Optionally, an electromagnetic shielding layer may be deposited on the surface of the graphite layer 220. For example, the electromagnetic shielding layer may be a copper layer or a nickel layer. The electromagnetic shielding layer can shield external magnetic fields, thereby reducing the electromagnetic interference of external magnetic fields on the protection circuit board 100.

[0025] Before the heat dissipation structure 200 covers the protective circuit board 100, the phase change grease layer 210 and the graphite layer 220 are protected. Optionally, the heat dissipation structure 200 may also include a first protective film layer 240, which may be attached to the side of the phase change grease layer 210 away from the graphite layer 220.

[0026] The heat dissipation structure 200 may also include a second protective film layer 250, which may be attached to the side of the graphite layer 220 opposite to the phase change grease layer 210.

[0027] When covering the heat dissipation structure 200 onto the protective circuit board 100, the first protective film layer 240 can be peeled off first, the phase change grease layer 210 can be applied to the protective circuit board 100, and then the second protective film layer 250 can be peeled off.

[0028] The heat dissipation structure 200 disclosed in this application provides protection for the phase change silicone grease layer 210 and the graphite layer 220 during transportation by attaching a first protective film layer 240 to the side of the phase change silicone grease layer 210 away from the graphite layer 220 and attaching a second protective film layer 250 to the side of the graphite layer 220 away from the phase change silicone grease layer 210.

[0029] To make it easier to install the heat dissipation structure 200 onto the battery frame 300, the heat dissipation structure 200 may optionally have a first positioning hole 201 extending in the stacking direction of the phase change grease layer 210 and the graphite layer 220. The first positioning hole 201 can be used to position and cooperate with the positioning post on the battery frame 300.

[0030] The heat dissipation structure 200 disclosed in this application embodiment has a first positioning hole 201 that extends through the stacking direction of the phase change silicone grease layer 210 and the graphite layer 220. This makes it easier to position the heat dissipation structure 200 during the installation of it on the battery frame 300 of the battery, as the positioning hole 201 and the positioning post can be used for positioning. This makes it easier to install the heat dissipation structure 200 on the battery frame 300 of the battery.

[0031] The protection circuit board 100 needs to be electrically connected to the main body of the electronic device through the connection terminal 600. In order to avoid the connection terminal 600 from extending beyond the battery frame 300, optionally, the edge of the heat dissipation structure 200 may be provided with a terminal avoidance groove 202 in the stacking direction of the phase change grease layer 210 and the graphite layer 220. The terminal avoidance groove 202 can be used to avoid the connection terminal 600 connecting the protection circuit board 100 to the main body of the electronic device.

[0032] Optionally, a heat dissipation groove can be formed on the side of the graphite layer 220 away from the phase change grease layer 210. The heat dissipation groove can increase the heat dissipation area of ​​the graphite layer 220, thereby improving the heat dissipation capacity of the heat dissipation structure 200.

[0033] This application also discloses a battery, which includes a battery frame 300, a battery cell 400, a protection circuit board 100, and a heat dissipation structure 200 disclosed in the above embodiments. The protection circuit board 100 and the battery cell 400 are disposed at a distance from each other on the battery frame 300, and are electrically connected. The protection circuit board 100 and the battery cell 400 can be disposed in corresponding mounting slots of the battery frame 300. The heat dissipation structure 200 is stacked on the protection circuit board 100 through a phase change silicone grease layer 210.

[0034] The battery disclosed in this application, by setting the heat dissipation structure 200 disclosed in the above embodiment, can solve the problem in the related art where the protection circuit board 100 is too hot, resulting in low working performance and service life of the battery protection board.

[0035] Optionally, the battery frame 300 may be provided with a positioning post, the heat dissipation structure 200 may be provided with a first positioning hole 201 that passes through the stacking direction of the phase change silicone grease layer 210 and the graphite layer 220, the protection circuit board 100 may be provided with a second positioning hole, the protection circuit board 100 may be sleeved on the positioning post through the second positioning hole, and the heat dissipation structure 200 may be sleeved on the positioning post through the first positioning hole.

[0036] The battery disclosed in this application embodiment has a positioning post on the battery frame 300, a first positioning hole 201 on the heat dissipation structure 200, and a second positioning hole on the protective circuit board 100. This allows the protective circuit board 100 to be fitted onto the positioning post through the second positioning hole, and the heat dissipation structure 200 to be fitted onto the positioning post through the first positioning hole, thereby making the battery assembly more convenient.

[0037] Optionally, the battery may further include a packaging structure 500, which can enclose the battery frame 300, the cell 400, the protection circuit board 100, and the heat dissipation structure 200, thereby protecting the cell 400, the protection circuit board 100, and the heat dissipation structure 200. Specifically, the material of the packaging structure 500 can be polyester film, polyimide, etc., and this application embodiment does not impose specific limitations on the material of the packaging structure 500. The packaging structure 500 may have a battery label (e.g., relevant certification marks, such as CE, UL, etc.).

[0038] This application also discloses an electronic device, which includes a device body and a battery as disclosed in the above embodiments, wherein the battery is disposed in the device body.

[0039] The electronic device disclosed in this application, by incorporating the battery disclosed in the above embodiments, can solve the problem in the related art where the temperature of the protection circuit board 100 is too high, resulting in low performance and lifespan of the battery protection board.

[0040] It should be noted that the phase change silicone grease layer 210 in this embodiment can also be replaced by thermally conductive gel. The graphite layer 220 can also be replaced by graphene composite film, carbon fiber, or thermally conductive ceramic, etc. This embodiment does not impose specific limitations on the type of heat dissipation structure 200.

[0041] The above embodiments of this utility model mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be described in detail here.

[0042] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention 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 the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A heat dissipation structure for dissipating heat from a protection circuit board (100) of a battery, characterized by, The heat dissipation structure (200) includes a phase change grease layer (210) and a graphite layer (220) stacked together, wherein the phase change grease layer (210) is used to adhere to the protective circuit board (100).

2. The heat dissipating structure according to claim 1, wherein The heat dissipation structure (200) further includes an adhesive layer (230), through which the phase change grease layer (210) is bonded to the graphite layer (220).

3. The heat dissipating structure according to claim 1, wherein The surface of the graphite layer (220) is coated with an electromagnetic shielding layer.

4. The heat dissipating structure according to claim 1, wherein The graphite layer (220) has a heat dissipation groove on the side opposite to the phase change grease layer (210).

5. The heat dissipating structure according to claim 1, wherein The heat dissipation structure (200) further includes a first protective film layer (240), which is attached to the side of the phase change silicone grease layer (210) opposite to the graphite layer (220), and / or, The heat dissipation structure (200) further includes a second protective film layer (250), which is attached to the side of the graphite layer (220) opposite to the phase change grease layer (210).

6. The heat dissipating structure according to claim 1, wherein The heat dissipation structure (200) has a first positioning hole (201) that extends through the stacking direction of the phase change grease layer (210) and the graphite layer (220). The first positioning hole (201) is used to position and cooperate with the positioning post on the battery frame (300) of the battery.

7. A battery, characterized by The device includes a battery frame (300), a battery cell (400), a protection circuit board (100), and a heat dissipation structure (200) as described in any one of claims 1 to 5. The protection circuit board (100) and the battery cell (400) are disposed at intervals on the battery frame (300) and are electrically connected. The heat dissipation structure (200) is stacked on the protection circuit board (100) through the phase change silicone grease layer (210).

8. The battery of claim 7, wherein, The battery frame (300) is provided with a positioning post, the heat dissipation structure (200) is provided with a first positioning hole (201) that passes through the stacking direction of the phase change silicone grease layer (210) and the graphite layer (220), the protection circuit board (100) is provided with a second positioning hole, the protection circuit board (100) is sleeved on the positioning post through the second positioning hole, and the heat dissipation structure (200) is sleeved on the positioning post through the first positioning hole.

9. The battery of claim 7, wherein, The battery also includes an encapsulation structure (500) that encapsulates the battery frame (300), the battery cell (400), the protection circuit board (100), and the heat dissipation structure (200).

10. An electronic device, characterized in that, It includes a device body and the battery as described in claim 9, wherein the battery is disposed in the device body.

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