Heat dissipation structure of battery and battery
By combining a composite plate structure of thermally conductive graphite plate and thermally conductive sheet, and incorporating the heating and cooling functions of Peltier, the problem of poor battery thermal conductivity is solved, enabling uniform temperature regulation of the battery cell, improving battery safety and range, while reducing system complexity and cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-13
- Publication Date
- 2026-03-13
AI Technical Summary
Existing technologies have poor thermal conductivity in batteries, resulting in uneven temperature distribution inside the battery, which affects safety and range. In addition, the liquid cooling system is complex and increases the overall vehicle cost.
The composite plate structure combining thermally conductive graphite plates and thermally conductive sheets, along with the heating and cooling functions of Peltier, improves the thermal conductivity of the battery cell and achieves uniform temperature regulation.
By combining thermally conductive graphite plates and thermally conductive sheets, the thermal conductivity of the battery cell is improved, enabling active, efficient, and uniform temperature regulation of the battery cell, reducing energy loss, and simplifying the liquid cooling system.
Smart Images
Figure CN223993298U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a heat dissipation structure for a battery and the battery itself. Background Technology
[0002] For battery overheating, the mainstream solutions currently offered in the market are liquid cooling and air cooling; for battery overcooling, the main solutions are PTC water heating or waste heat recovery water heating.
[0003] Batteries are mainly composed of low thermal conductivity materials such as separators, electrolytes, and active materials. Therefore, the thermal conductivity of batteries is poor. The above solutions mainly alleviate the high or low temperature of the battery core by heating or cooling the outer surface of the battery through gradual heat conduction. This is accompanied by a large amount of energy loss, and the internal temperature distribution of the battery is relatively uneven. It cannot effectively improve the safety and range of the battery. At the same time, the liquid cooling system also requires the addition of complex piping and control circuit systems, which greatly increases the cost of the whole vehicle.
[0004] To address the aforementioned technical problems, existing technologies involve adding thermally conductive graphite sheets inside the battery cell. However, these sheets only exhibit excellent thermal conductivity in the cross-sectional direction (thermal conductivity can reach 4000 W / (m·K)), while their thermal conductivity in the normal direction is poor (thermal conductivity can be less than 10 W / (m·K)). This makes it difficult to effectively dissipate or transfer heat from the core, and the temperature distribution within the battery cell remains uneven. Utility Model Content
[0005] The purpose of this utility model is to provide a solution to the above-mentioned technical problems.
[0006] The technical solution adopted in this utility model is as follows:
[0007] A heat dissipation structure for a battery includes a thermally conductive graphite plate, a thermally conductive sheet, and a Peltier, wherein the thermally conductive sheet is embedded inside the thermally conductive graphite plate, and the Peltier is disposed opposite one side of the thermally conductive graphite plate.
[0008] Preferably, the thermally conductive graphite plate has several mounting holes, and the thermally conductive sheet is embedded in the mounting holes.
[0009] Preferably, the thermally conductive graphite plate has a plurality of first electrolyte flow holes.
[0010] Preferably, the heat-conducting sheet has at least one second electrolyte flow hole.
[0011] Preferably, the surface of the thermally conductive graphite plate is provided with an insulating film.
[0012] Preferably, the material also includes a thermally conductive adhesive, which is disposed on one side of the thermally conductive graphite plate opposite to the Peltier.
[0013] Preferably, the thickness of the heat-conducting sheet is the same as or different from the thickness of the heat-conducting graphite plate.
[0014] Preferably, the Peltier is arranged in an elongated strip shape.
[0015] Preferably, one of the heat-conducting sheets is disposed in the middle of the heat-conducting graphite plate.
[0016] A battery includes a heat dissipation structure, a battery housing, and a plurality of cores disposed inside the battery housing. A thermally conductive graphite plate is disposed between two adjacent cores or between a core and the inner wall of the battery housing. A Peltier mounting groove is formed on the side wall of the battery housing, and a Peltier is disposed in the Peltier mounting groove. The thermally conductive graphite plate faces the Peltier mounting groove and contacts the side wall of the Peltier mounting groove.
[0017] The above technical solution has the following advantages or beneficial effects:
[0018] In this invention, a composite plate structure is formed by combining a thermally conductive graphite plate with a thermally conductive sheet. The thermally conductive graphite has ultra-high thermal conductivity in the longitudinal direction, while the thermally conductive sheet has excellent thermal conductivity in the normal direction, which greatly improves the thermal conductivity of the battery cell. At the same time, combined with the heating and cooling functions of Peltier, the battery cell can actively, efficiently and uniformly regulate its own temperature. Attached Figure Description
[0019] Figure 1 This is a cross-sectional schematic diagram of the battery in this utility model;
[0020] Figure 2 This is a schematic diagram of the combination of the thermally conductive graphite plate and the thermally conductive sheet in this utility model;
[0021] Figure 3 This is a schematic diagram of the structure of the thermally conductive graphite plate in this utility model;
[0022] Figure 4 This is a schematic diagram of the structure of the heat-conducting sheet in this utility model;
[0023] Figure 5 This is a schematic diagram of the fit between the Peltier mounting groove and the battery casing in this utility model;
[0024] Figure 6 This is a schematic diagram of the Peltier structure in this utility model;
[0025] Figure 7 This is a schematic diagram of the heat flow path in the battery cooling mode of this utility model;
[0026] Figure 8 This is a schematic diagram of the heat flow path in the battery heating mode of this utility model;
[0027] Figure 9 This is a schematic diagram illustrating the principle of heat-conducting plate regulating the temperature distribution of the battery cell in this utility model.
[0028] In the diagram: 1. Thermally conductive graphite plate; 2. Thermally conductive sheet; 3. Peltier; 4. Mounting hole; 5. First electrolyte flow hole; 6. Second electrolyte flow hole; 7. Battery casing; 8. Core; 9. Peltier mounting groove. Detailed Implementation
[0029] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. 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.
[0030] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0032] Figure 1 This is a cross-sectional schematic diagram of the battery in this utility model; Figure 2 This is a schematic diagram of the combination of the thermally conductive graphite plate and the thermally conductive sheet in this utility model; Figure 3 This is a schematic diagram of the structure of the thermally conductive graphite plate in this utility model;
[0033] Figure 4 This is a schematic diagram of the structure of the heat-conducting sheet in this utility model; Figure 5 This is a schematic diagram of the fit between the Peltier mounting groove and the battery casing in this utility model; Figure 6 This is a schematic diagram of the Peltier structure in this utility model; Figure 7 This is a schematic diagram of the heat flow path in the battery cooling mode of this utility model; Figure 8 This is a schematic diagram of the heat flow path in the battery heating mode of this utility model; Figure 9 This is a schematic diagram illustrating the principle of heat-conducting plate regulating the temperature distribution of the battery cell in this utility model. Please refer to [link / reference]. Figures 1 to 9 As shown, a heat dissipation structure for a battery includes a thermally conductive graphite plate 1, a thermally conductive sheet 2, and a Peltier 3. The thermally conductive sheet 2 is embedded inside the thermally conductive graphite plate 1, and the Peltier 3 is positioned opposite one side of the thermally conductive graphite plate 1. In this embodiment, see [reference needed]. Figure 1 As shown, a thermally conductive graphite plate 1 is sandwiched between two cores 8, and a thermally conductive sheet 2 is embedded inside the thermally conductive graphite plate 1. Then, the thermally conductive graphite plate 1 is installed directly above the Peltier 3. Since the thermally conductive sheet 2 is made of a metal material with excellent thermal conductivity, such as copper or other metal materials with excellent thermal conductivity, this can improve the normal thermal conductivity of the core 8. The thermally conductive graphite plate 1 has excellent thermal conductivity in the cross direction, which can improve the cross-sectional thermal conductivity of the core 8. Combined with the cooling and heating functions of the Peltier 3, it can effectively conduct heat from the core 8 to the Peltier 3 for cooling, or conduct heat generated by the Peltier 3 to the core 8 for heating. The heat conduction path formed by the thermally conductive graphite plate 1 and the thermally conductive sheet 2 can transfer the temperature of the "hot spot" area of the core 8 to the lower temperature area to ensure that the temperature distribution of the core 8 is relatively uniform.
[0034] In this embodiment, the heat-conducting sheet 2 exhibits excellent thermal conductivity in all directions (10–10000 W / (m·K)) to improve the normal thermal conductivity of the battery. The heat-conducting sheet 2 is disposed on the thermally conductive graphite plate 1, allowing heat flow from the heat-conducting sheet 2 to be conducted along the surface of the thermally conductive graphite plate 1, or conducted in the reverse direction along the same path. The thermally conductive graphite plate 1 is installed between the cores 8 or between the cores 8 and the battery casing 7 to directly absorb the heat generated by the cores 8, or to heat the cores 8.
[0035] In this embodiment, the thickness of the thermally conductive graphite plate 1 can be 1.5 mm. The specific thickness of the thermally conductive graphite plate 1 can be set as needed, and the shape of the thermally conductive graphite plate 1 can be square or other shapes.
[0036] Furthermore, as a preferred embodiment, the heat-conducting graphite plate 1 has several mounting holes 4, and the heat-conducting sheet 2 is embedded in the mounting holes 4. See also Figure 2 and Figure 3As shown, there are five heat-conducting plates 2 and five mounting holes 4. One heat-conducting plate 2 is located in the middle of the heat-conducting graphite plate 1, which absorbs the high temperature of the central area of the core 8 when the battery temperature is too high. The remaining heat-conducting plates 2 are located around the heat-conducting plate 2 in the middle position, which can balance the temperature distribution of the battery cell.
[0037] Furthermore, as a preferred embodiment, the thermally conductive graphite plate 1 has a plurality of first electrolyte flow holes 5, and the thermally conductive sheet 2 has at least one second electrolyte flow hole 6, to facilitate the passage of electrolyte inside the battery and ensure the uniformity of electrolyte concentration within the cell. The number of first electrolyte flow holes 5 is greater than the number of second electrolyte flow holes 6. The first electrolyte flow holes 5 are mainly distributed in the middle of the core 8, while the second electrolyte flow holes 6 are distributed around the perimeter. The shapes of the first electrolyte flow holes 5 and the second electrolyte flow holes 6 can be configured as needed.
[0038] Furthermore, as a preferred embodiment, an insulating film is provided on the surface of the thermally conductive graphite plate 1 to prevent short circuits inside the battery cell.
[0039] Furthermore, as a preferred embodiment, thermally conductive adhesive is also included. Thermally conductive adhesive is provided on one side of the thermally conductive graphite plate 1 that is directly opposite the Peltier 3, which can improve the contact effect.
[0040] Furthermore, as a preferred embodiment, the thickness of the heat-conducting sheet 2 may be the same as or different from the thickness of the heat-conducting graphite plate 1. In this embodiment, the thickness of the heat-conducting sheet is preferably the same as the thickness of the heat-conducting graphite plate 1, so that the two side surfaces of the heat-conducting sheet can be flush with the two side surfaces of the heat-conducting graphite plate 1, improving the overall aesthetics. In other embodiments, the thickness of the heat-conducting sheet 2 may be less than the thickness of the heat-conducting graphite plate 1, with the thickness difference between the two being less than 50%.
[0041] Furthermore, as a preferred embodiment, the Peltier 3 is arranged in a long strip shape. The strip-shaped Peltier 3 can directionally heat or cool the core position of the battery cell relative to the plate-shaped Peltier 3, thereby reducing the energy loss of temperature control; wherein the battery cell includes several cores 8.
[0042] The above are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Based on the above embodiments, the present utility model also provides a battery, including a heat dissipation structure for the battery, a battery housing 7, and a plurality of cores 8 disposed inside the battery housing 7. A thermally conductive graphite plate 1 is disposed between two adjacent cores 8 or between a core 8 and the inner wall of the battery housing 7. A Peltier mounting groove 9 is provided on the side wall of the battery housing 7. A Peltier 3 is disposed in the Peltier mounting groove 9. The thermally conductive graphite plate 1 faces the Peltier mounting groove 9 and contacts the side wall of the Peltier mounting groove 9. The battery cell consists of several cores 8 arranged inside the battery casing 7. A Peltier mounting groove 9 is located at the lower end of the battery casing 7, directly opposite the thermally conductive graphite plate 1. This allows the thermally conductive graphite plate 1 to contact the side wall of the Peltier mounting groove 9 (specifically, the upper side wall). This allows heat to flow along the path of Peltier 3 – side wall of Peltier mounting groove 9 – thermally conductive graphite plate 1. The Peltier 3 is installed within the Peltier mounting groove 9 to avoid interference when the battery cells are subsequently installed into the PACK (battery pack).
[0043] in, Figure 7 , Figure 8 and Figure 9 The direction indicated by the middle arrow is the direction of heat transfer.
[0044] In use, the core 8 is installed inside the battery casing 7. Then, the heat-conducting plate and the heat-conducting graphite plate 1 are assembled together. As needed, the heat-conducting graphite plate 1 is installed between cores 8 or between the core 8 and the battery casing 7. Based on the installation position of the heat-conducting graphite plate 1, a Peltier mounting groove 9 is opened at the corresponding position at the lower end of the battery casing 7. Then, the Peltier 3 is installed in the Peltier mounting groove 9. The heat generated by the core 8 can be directly transferred to the heat-conducting sheet 2, achieving rapid diffusion of normal heat, and then transferred to the heat-conducting graphite plate 1, achieving rapid transfer of transverse heat, thereby transferring heat to the Peltier 3 to achieve a cooling effect. When the Peltier 3 heats up, it rapidly transfers heat to the heat-conducting graphite plate 1, then the heat-conducting graphite plate 1 transfers heat to the heat-conducting sheet 2, and the heat-conducting sheet 2 transfers heat to the core 8, achieving a heating effect for the core 8.
[0045] In this embodiment, the thermal conductivity of the heat-conducting sheet 2 in the normal direction is better than that of the heat-conducting graphite plate 1 in the normal direction, while the thermal conductivity of the heat-conducting graphite plate 1 in the cross direction is better than that of the heat-conducting sheet in the cross direction. See also Figure 1 The direction shown is the span. Figure 1 The vertical direction shown is normal. Figure 1 The left and right directions are shown.
[0046] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A heat dissipation structure of a battery, characterized by comprising: The heat-conducting graphite plate comprises a heat-conducting graphite plate, a heat-conducting sheet embedded in the heat-conducting graphite plate, and a Peltier device opposite to one side of the heat-conducting graphite plate.
2. The heat dissipation structure of a battery according to claim 1, wherein The heat-conducting graphite plate is provided with a plurality of mounting holes, and the heat-conducting sheet is embedded in the mounting holes.
3. The heat dissipation structure of a battery according to claim 1, wherein The heat-conducting graphite plate is provided with a plurality of first electrolyte overflow holes.
4. The heat dissipation structure of a battery according to claim 1, wherein The heat-conducting sheet is provided with at least one second electrolyte overflow hole.
5. The heat dissipating structure of a battery according to claim 1, wherein The surface of the heat-conducting graphite plate is provided with an insulating film.
6. The heat dissipating structure of a battery according to claim 1, wherein The heat-conducting graphite plate is further provided with heat-conducting glue opposite to one side of the Peltier device.
7. The heat dissipating structure of a battery according to claim 1, wherein The thickness of the heat-conducting sheet is the same as or different from the thickness of the heat-conducting graphite plate.
8. The heat dissipating structure of a battery according to claim 1, wherein The Peltier device is in the shape of a long strip.
9. The heat dissipating structure of a battery according to claim 1, wherein One of the heat-conducting sheets is arranged in the middle of the heat-conducting graphite plate.
10. A battery comprising the heat dissipation structure of the battery according to claim 1, characterized by, The battery shell is further provided with a plurality of cores, and the heat-conducting graphite plate is arranged between two adjacent cores or between the core and the inner wall of the battery shell. The side wall of the battery shell is provided with a Peltier device mounting groove, the Peltier device is arranged in the Peltier device mounting groove, the heat-conducting graphite plate is opposite to the Peltier device mounting groove and in contact with the side wall of the Peltier device mounting groove.