Battery top cover, battery and electric equipment
By providing a high thermal conductivity first thermal conductivity layer on the through hole of the battery cover, the problem of heat accumulation during fast charging of the battery is solved, and more effective heat dissipation and improved the safety performance of the battery is achieved.
Patent Information
- Application Number
- CN202323318752.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-06
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-06
AI Technical Summary
The internal heat rises rapidly during fast charging, especially when heat accumulates at the connection between the battery cell ears and pole pillars, affecting the battery performance and may lead to thermal runaway and reducing safety performance.
A battery ceiling is designed, including a cover body and a pole pillar. The cover body has a through hole. A first thermal conductivity layer is provided on the hole wall of the through hole, and its thermal conductivity is higher than that of the cover body and the pole pillar. Through this structure Quickly transfer heat to the thermal conductive layer to improve heat dissipation effect.
Effectively distribute internal heat of the battery, improve the heat dissipation effect of the battery, prevent heat loss, and enhance the safety performance of the battery.
Smart Images
Figure CN222146392U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery top cover, a battery and electrical equipment. Background Art
[0002] As a new type of secondary battery, lithium-ion battery has the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. It has broad application prospects in portable appliances, power tools, large-scale energy storage, electric transportation power supply, etc.
[0003] At present, when the battery is fast charged, the temperature inside the battery rises rapidly, especially at the connection position between the battery cell tab and the pole. The heat generated accumulates in the battery, affecting the battery performance and may cause thermal runaway of the battery, reducing the battery safety performance. Utility Model Content
[0004] One of the purposes of the utility model is to provide a battery top cover to address the shortcomings of the prior art, so as to solve the problem that when the battery is fast charged, the internal temperature of the battery rises rapidly, especially the connection between the battery cell ear and the pole, and the heat generated accumulates in the battery, which affects the battery performance and may cause thermal runaway of the battery, thereby reducing its safety performance.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] A battery top cover comprises a cover body and a pole, wherein the cover body has a first surface and a second surface arranged opposite to each other along its thickness direction, and a through hole penetrating the first surface and the second surface, the pole is penetrated through the through hole, a first heat-conducting layer is arranged on the hole wall of the through hole, and the thermal conductivity of the cover body and / or the thermal conductivity of the pole are both smaller than the thermal conductivity of the first heat-conducting layer.
[0007] Preferably, a second heat conducting layer is provided on the first surface and / or the second surface.
[0008] Preferably, the cover plate body further has a side surface, the side surface connects the first surface and the second surface, and a third heat conducting layer is disposed on the side surface.
[0009] Preferably, the second heat conducting layer connects the first heat conducting layer and the third heat conducting layer.
[0010] Preferably, the first heat-conducting layer, the second heat-conducting layer and the third heat-conducting layer are all insulating heat-conducting layers.
[0011] Preferably, at least one of the first heat-conducting layer, the second heat-conducting layer and the third heat-conducting layer is a silicon carbide coating.
[0012] Preferably, the thickness of the first heat-conducting layer, the thickness of the second heat-conducting layer and the thickness of the third heat-conducting layer are all 0.5-100 μm.
[0013] Preferably, the thickness of the second heat-conducting layer and the thickness of the third heat-conducting layer are both smaller than the thickness of the first heat-conducting layer.
[0014] Another object of the present invention is to provide a battery, comprising the battery top cover as described above in the specification.
[0015] Another object of the present invention is to provide an electrical device, comprising the battery described above in the specification.
[0016] The beneficial effect of the utility model lies in that the battery top cover of the utility model, through the coordinated use of the cover body and the pole, the cover body has a through hole penetrating the first surface and the second surface, the pole is arranged on the through hole, and the thermal conductivity of the cover body and / or the thermal conductivity of the pole is smaller than the thermal conductivity of the first heat-conducting layer on the hole wall of the through hole, so that the heat generated inside the battery can be quickly transferred to the first heat-conducting layer, so that the heat generated inside the battery can be dissipated to the outside of the battery, thereby improving the heat dissipation effect of the battery top cover, so as to improve the heat dissipation effect of the battery, effectively prevent the battery from thermal runaway, and improve the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
[0018] Figure 1 This is one of the structural schematic diagrams of the battery top cover of the utility model.
[0019] Figure 2 This is the second structural schematic diagram of the battery top cover of the utility model.
[0020] Figure 3 This is the third structural schematic diagram of the battery top cover of the utility model.
[0021] Figure 4 This is the fourth structural schematic diagram of the battery top cover of the utility model.
[0022] The reference numerals are described as follows:
[0023] 100. Battery cover;
[0024] 10. Cover plate body; 11. First surface; 12. Second surface; 13. Side surface; 14. Through hole;
[0025] 20. Pole;
[0026] 30. A first heat conducting layer;
[0027] 40. A second heat conducting layer;
[0028] 50. The third heat conducting layer;
[0029] a. Thickness direction of the cover body. DETAILED DESCRIPTION
[0030] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.
[0031] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.
[0032] In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.
[0033] The following is combined with Figures 1 to 4 The utility model is further described in detail, but it is not intended to limit the utility model.
[0034] The electrical equipment of the embodiment of the utility model includes a battery. The electrical equipment may be a car, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The car may be a fuel car, a gas car, or a new energy car, and the new energy car may be a pure electric car, a hybrid car, or an extended-range car, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiment of the present application does not impose any special restrictions on the above-mentioned electrical equipment.
[0035] The battery of the embodiment of the utility model comprises a shell, a battery top cover 100 and a battery cell. The battery top cover 100 covers the opening of the shell and forms a receiving cavity between the battery top cover 100 and the shell. The battery cell is arranged in the receiving cavity.
[0036] It should be noted that the battery can be one or more. If there are multiple batteries, the multiple batteries can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple batteries are connected in series and in parallel. Multiple batteries can be directly connected in series, in parallel, or in mixed connection to form a whole; of course, multiple batteries can also be connected in series, in parallel, or in mixed connection to form a battery module, and multiple battery modules can then be connected in series, in parallel, or in mixed connection to form a whole.
[0037] See also Figures 1 to 4 The battery top cover 100 of the utility model embodiment includes a cover body 10 and a pole 20. The cover body 10 has a first surface 11 and a second surface 12 arranged opposite to each other along its thickness direction a, and a through hole 14 penetrating the first surface 11 and the second surface 12. The pole 20 is penetrated through the through hole 14. A first heat-conducting layer 30 is arranged on the hole wall of the through hole 14. The thermal conductivity of the cover body 10 and / or the thermal conductivity of the pole 20 are both smaller than the thermal conductivity of the first heat-conducting layer 30.
[0038] Compared with the prior art, the battery top cover 100 of the embodiment of the utility model, through the coordinated use of the cover body 10 and the pole 20, the cover body 10 has a through hole 14 penetrating the first surface 11 and the second surface 12, the pole 20 is penetrated through the through hole 14, and the thermal conductivity of the cover body 10 and / or the thermal conductivity of the pole 20 are both smaller than the thermal conductivity of the first thermal conductive layer 30 on the hole wall of the through hole 14. In this way, the heat generated inside the battery can be quickly transferred to the first thermal conductive layer 30, so that the heat generated inside the battery can be dissipated to the outside of the battery, thereby improving the heat dissipation effect of the battery top cover 100, so as to improve the heat dissipation effect of the battery, effectively prevent the battery from thermal runaway, and improve the safety performance of the battery.
[0039] Specifically, the thermal conductivity of the cover body 10, the thermal conductivity of the pole 20, and the thermal conductivity of the first heat-conducting layer 30 include at least the following relationships:
[0040] The first type: the thermal conductivity of the cover body 10 is smaller than the thermal conductivity of the first heat-conducting layer 30 .
[0041] The second type: the thermal conductivity of the pole 20 is smaller than the thermal conductivity of the first heat conducting layer 30 .
[0042] The third type: the thermal conductivity of the cover body 10 and the thermal conductivity of the pole 20 are both smaller than the thermal conductivity of the first heat-conducting layer 30 .
[0043] It should be noted that thermal conductivity refers to the ability of the reaction material to conduct heat, and satisfies the relationship: λ=αρC, where λ is the thermal conductivity, α is the thermal diffusion coefficient, ρ is the material density, and C is the specific heat capacity.
[0044] See also Figure 1 and 3 In some embodiments, a second heat-conducting layer 40 is disposed on the first surface 11 and / or the second surface 12. By disposing the second heat-conducting layer 40, when the battery is fast charged, the heat generated inside the battery can not only be quickly transferred to the first heat-conducting layer 30, but also can be quickly transferred to the second heat-conducting layer 40, so that the heat generated inside the battery can be dissipated to the outside of the battery, further improving the heat dissipation effect of the battery top cover 100, so as to improve the heat dissipation effect of the battery.
[0045] Specifically, the second heat conducting layer 40 includes at least the following configurations:
[0046] The first type: the second heat conducting layer 40 is disposed on the first surface 11 .
[0047] The second type: the second heat conducting layer 40 is disposed on the second surface 12 .
[0048] The third type: the second heat conducting layer 40 is disposed on both the first surface 11 and the second surface 12 .
[0049] Preferably, when a second thermal conductive layer 40 is provided on both the first surface 11 and the second surface 12, the heat generated inside the battery can be conducted from the inside of the battery to the outside of the battery via a thermal conductive path of the second thermal conductive layer 40 on the second surface 12, the cover body 10 and the second thermal conductive layer 40 on the first surface 11. The heat dissipation effect of this method is better than that of the other two methods.
[0050] See also Figure 1 and 4 In some embodiments, the cover body 10 further has a side surface 13, the side surface 13 connects the first surface 11 and the second surface 12, and a third heat-conducting layer 50 is disposed on the side surface 13. Through the provision of the third heat-conducting layer 50, when the battery is fast charged, the heat generated inside the battery can be quickly transferred to the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50, so that the heat generated inside the battery can be dissipated to the outside of the battery, effectively improving the heat dissipation rate of the battery top cover 100, so as to improve the heat dissipation effect of the battery top cover 100.
[0051] See also Figure 1 In some embodiments, the second heat-conducting layer 40 connects the first heat-conducting layer 30 and the third heat-conducting layer 50. By sequentially connecting the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50, the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50 can effectively form a whole, so as to improve the heat dissipation effect of the battery top cover 100.
[0052] Specifically, the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50 are connected in sequence to form a whole. The whole can cover all surfaces of the cover body 10, that is, the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50 all cover the surface of the cover body 10 where they are located, effectively increasing the area of the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50, improving the heat dissipation rate of the battery top cover 100, and ensuring the heat dissipation effect of the battery top cover 100. Of course, the whole can also cover part of the surface of the cover body 10.
[0053] In some embodiments, the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50 are all insulating heat-conducting layers. During use, the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50 can not only conduct heat from the inside of the battery to the outside of the battery to ensure the heat dissipation effect of the battery, but also have an insulating effect, so that when the cover body 10 is in contact or connected with other workpieces, there is no need to add insulating parts. For example, the second surface 12 of the cover body 10 can be insulated from the end face of the battery cell by the second heat-conducting layer 40, and the hole wall of the through hole 14 of the cover body 10 and the pole 20 can be insulated by the first heat-conducting layer 30.
[0054] In some embodiments, at least one of the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50 is a silicon carbide coating. Through the setting of the silicon carbide coating, the silicon carbide coating has good thermal conductivity, and its thermal conductivity is higher than the thermal conductivity of the cover body 10 and the thermal conductivity of the pole 20, which effectively ensures the heat dissipation effect of the battery. At the same time, the silicon carbide coating also has good insulation, wear resistance and corrosion resistance, effectively increases the insulation performance of the cover body 10, and prevents the surface of the cover body 10 from being worn, corroded or oxidized.
[0055] It should be noted that the silicon carbide coating can be processed on the surface of the cover body 10 by a process method such as in-situ generation, powder metallurgy, extrusion casting, spray deposition, and infiltration. When the cover body 10 is aluminum, since the thermal conductivity of aluminum oxide is lower than that of aluminum, the thermal conductivity of aluminum oxide is worse than that of aluminum, and the rate of heat extraction from the inside of the battery to the outside of the battery is poor. Therefore, before the silicon carbide coating is processed on the surface of the cover body 10, the cover body 10 needs to be pre-treated, that is, the aluminum oxide layer on the surface of the cover body 10 is removed. Of course, the treatment method of the aluminum oxide layer can be, but is not limited to, immersion treatment in an alkaline solution or an acidic solution.
[0056] Specifically, the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50 may also use other materials with heat-conducting and insulating properties, such as aluminum nitride, boron nitride, aluminum oxide, silicon oxide, etc., so as to conduct heat from the inside of the battery to the outside of the battery. Of course, the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50 may use the same or different materials.
[0057] In some embodiments, the thickness of the first heat-conducting layer 30, the thickness of the second heat-conducting layer 40 and the thickness of the third heat-conducting layer 50 are all 0.5-100 μm. This thickness range can effectively ensure the thermal conductivity of the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50, while also preventing the battery top cover 100 from being too thick, thereby increasing the height of the battery and affecting the battery capacity.
[0058] Specifically, the thickness of the first heat-conducting layer 30, the thickness of the second heat-conducting layer 40, and the thickness of the third heat-conducting layer 50 are all 0.5-20.4 μm, 20.4-40.3 μm, 40.3-60.2 μm, 60.2-80.1 μm, or 80.1-100 μm. For example, the thickness of the first heat-conducting layer 30, the thickness of the second heat-conducting layer 40, and the thickness of the third heat-conducting layer 50 are all 0.5 μm, 3 μm, 10 μm, 23 μm, 30 μm, 35 μm, 42 μm, 50 μm, 64 μm, 78 μm, or 98 μm, but are not limited to the listed values, and other values within the numerical range are also applicable.
[0059] Preferably, the thickness of the first heat conducting layer 30 , the thickness of the second heat conducting layer 40 , and the thickness of the third heat conducting layer 50 are all 2-20 μm.
[0060] In some embodiments, the thickness of the second heat-conducting layer 40 and the thickness of the third heat-conducting layer 50 are both smaller than the thickness of the first heat-conducting layer 30. Since the surface areas of the cover body 10 where the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50 are located are different, the coating areas of the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50 are different, that is, the coating area of the first heat-conducting layer 30 is smaller than the coating area of the second heat-conducting layer 40 and the coating area of the third heat-conducting layer 50, so that the first heat-conducting layer 30, the second heat-conducting layer 40 and the third heat-conducting layer 50 have different heat dissipation effects on the battery. Therefore, for the pole 20 with the most serious heat generation, and the corresponding first heat-conducting layer 30 with a smaller coating area, it is necessary to thicken the thickness of the first heat-conducting layer 30 to ensure the heat dissipation effect on the pole 20. For the second heat-conducting layer 40 with a larger coating area, the thickness of the second heat-conducting layer 40 can be appropriately thinned. While ensuring the thermal conductivity of the second heat-conducting layer 40, it can avoid the battery top cover 100 being too thick, thereby increasing the height of the battery and affecting the battery capacity.
[0061] It should be noted that the battery cell using the battery top cover 100 of the above embodiment is suitable for a module or a whole pack with a water cooling structure on the top. During use, a thermally conductive silicone can be arranged between the battery top cover 100 and the water cooling structure to maximize the thermal conductivity and heat dissipation capabilities of the battery top cover 100.
[0062] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.
Claims
1. Battery cover, Features: The invention comprises a cover plate body (10) and a pole (20), wherein the cover plate body (10) has a first surface (11) and a second surface (12) arranged opposite to each other along its thickness direction (a), and a through hole (14) penetrating the first surface (11) and the second surface (12), the pole (20) is inserted into the through hole (14), a first heat-conducting layer (30) is arranged on the hole wall of the through hole (14), and the thermal conductivity coefficient of the cover plate body (10) and / or the thermal conductivity coefficient of the pole (20) are both smaller than the thermal conductivity coefficient of the first heat-conducting layer (30).
2. The battery top cover as claimed in claim 1, Features: A second heat conducting layer (40) is provided on the first surface (11) and / or the second surface (12).
3. The battery top cover as claimed in claim 2, Features: The cover plate body (10) further comprises a side surface (13), wherein the side surface (13) connects the first surface (11) and the second surface (12), and a third heat conducting layer (50) is arranged on the side surface (13).
4. The battery top cover as claimed in claim 3, Features: The second heat conducting layer (40) connects the first heat conducting layer (30) and the third heat conducting layer (50).
5. The battery top cover as claimed in claim 3, Features: The first heat-conducting layer (30), the second heat-conducting layer (40) and the third heat-conducting layer (50) are all insulating heat-conducting layers.
6. The battery top cover as claimed in claim 3, Features: At least one of the first heat-conducting layer (30), the second heat-conducting layer (40) and the third heat-conducting layer (50) is a silicon carbide coating.
7. The battery top cover as claimed in claim 3, Features: The thickness of the first heat-conducting layer (30), the thickness of the second heat-conducting layer (40) and the thickness of the third heat-conducting layer (50) are all 0.5 to 100 μm.
8. The battery top cover as claimed in claim 3, Features: The thickness of the second heat-conducting layer (40) and the thickness of the third heat-conducting layer (50) are both smaller than the thickness of the first heat-conducting layer (30). 9.Battery, Features: The invention comprises the battery top cover according to any one of claims 1 to 8.
10. Electrical equipment, Features: A battery comprising the battery of claim 9.