Lithium battery heat dissipation bottom plate with heat-conducting silica gel pad

Abstract

The utility model provides a lithium battery heat dissipation bottom plate with heat conduction silica gel pad belongs to lithium battery heat dissipation technical field, this lithium battery heat dissipation bottom plate with heat conduction silica gel pad, including lithium battery group, heat dissipation bottom plate is located in the lower end of lithium battery group, silica gel heat dissipation group, silica gel heat dissipation group includes battery installation groove, silica gel contact pad, heat dissipation convex cylinder, sheet heat dissipation tab, silica gel heat dissipation hole and battery heat dissipation hole, battery installation groove is located in the upper end of heat dissipation bottom plate and is located in battery installation groove in lithium battery group, silica gel contact pad fixedly connected in the lower inner wall of battery installation groove, battery heat dissipation hole is located in the upper end of silica gel contact pad, effectively solved the temperature distribution uneven problem, significantly improved the overall heat dissipation efficiency and the precision of heat management.

Description

Technical Field

[0001] This utility model belongs to the field of lithium battery heat dissipation technology, specifically relating to a lithium battery heat dissipation base plate with a thermally conductive silicone pad. Background Technology

[0002] Lithium-ion battery technology is already quite mature and continues to develop rapidly, mainly focusing on improving energy density, power density, safety, cycle life, reducing costs, and improving fast charging performance.

[0003] The patent application CN221783303U discloses a cooling base plate for lithium battery equipment. The base plate includes a cooling mechanism, which comprises a cooling coil fixedly connected to the bottom of the inner wall of the base plate. Multiple heat dissipation plates are fixedly interlocked at the bottom of the inner wall of the base plate, with the outer walls of the heat dissipation plates fitting against the outer walls of the cooling coils. Multiple heat dissipation grooves are equidistantly formed at the bottom of the base plate. A connecting mechanism is provided between the base plate and a cover plate. This invention absorbs and conducts heat generated by the lithium battery pack by placing it on the upper surface of the cover plate. The heat is absorbed by the coolant flowing within the cooling coil in the inner cavity of the base plate, and the multiple heat dissipation plates absorb the heat from the flowing coolant within the cooling coil. Furthermore, the multiple heat dissipation grooves facilitate airflow at the bottom of the base plate, allowing air to flow through the bottom of the heat dissipation plates and dissipate heat, thus improving the heat dissipation effect of the base plate on the lithium battery.

[0004] The aforementioned patent dissipates heat from the heat sink, improving the heat dissipation effect of the base plate on the lithium battery. However, existing technologies only dissipate heat through heat dissipation holes. Once the battery experiences thermal runaway due to internal defects such as micro-short circuits or overcharging, the internal pressure rises sharply. The pre-existing heat dissipation holes become weak points for pressure release, causing the casing to rupture around the holes, resulting in a more violent ejection of high-temperature flammable gases and flames. Utility Model Content

[0005] The purpose of this invention is to provide a lithium battery heat dissipation base plate with a thermally conductive silicone pad, which aims to solve the problem in the prior art that once the battery has internal defects such as micro-short circuits, the heat dissipation holes will become weak points for pressure release, which will cause the casing to crack around the holes.

[0006] To achieve the above objectives, this utility model provides the following technical solution: A lithium battery heat dissipation base plate with a thermally conductive silicone pad, comprising: Lithium battery pack; A heat dissipation base plate is located at the lower end of the lithium battery pack; A silicone heat dissipation assembly includes a battery mounting slot, a silicone contact pad, a heat dissipation protrusion, a sheet-like heat dissipation fin, silicone heat dissipation holes, and battery heat dissipation holes. The battery mounting slot is located at the upper end of a heat dissipation base plate, and a lithium battery pack is disposed within the battery mounting slot. The silicone contact pad is fixedly connected to the lower inner wall of the battery mounting slot. The battery heat dissipation holes are located at the upper end of the silicone contact pad. The heat dissipation protrusion is fixedly connected to the lower end of the silicone contact pad and is located at the lower end of the lithium battery pack. The sheet-like heat dissipation fins are located on the circumferential surface of the heat dissipation protrusion. The silicone heat dissipation holes are located at the upper end of the heat dissipation protrusion and are matched with the battery heat dissipation holes.

[0007] In a preferred embodiment of this invention, both the silicone contact pad and the heat dissipation protrusion are made of thermally conductive silicone material.

[0008] In a preferred embodiment of this utility model, a connecting groove is provided on the lower inner wall of the battery mounting slot, and a connecting block is fixedly connected to the upper end of the heat dissipation protrusion. The connecting block is located in the connecting groove, and the heat dissipation protrusion is connected to the silicone contact pad through the connecting block.

[0009] As a preferred embodiment of this utility model, the lower end of the silicone contact pad is fixedly connected to a plurality of silicone support sleeves, and the plurality of silicone support sleeves are respectively disposed in a plurality of heat dissipation protrusions for support.

[0010] As a preferred embodiment of this utility model, the lower end of the lithium battery pack is provided with a through cylinder, and the lower end of the through cylinder is provided with a cooling air heat dissipation hole, which matches the battery heat dissipation hole.

[0011] As a preferred embodiment of this utility model, a silicone heat dissipation groove is provided on the side end of the tube.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. In this solution, openings on the lithium battery body are completely avoided. All heat dissipation structures are integrated on the external heat dissipation base plate and silicone heat dissipation assembly. Efficient heat conduction is achieved through thermally conductive silicone pads. The battery only uses its own through-tube to connect with the external air duct, thus completely preserving the original sealed structure of the battery. This fundamentally eliminates safety hazards such as electrolyte leakage, intrusion of external contaminants, and reduction in casing strength, ensuring the inherent safety of the system operation.

[0013] 2. In this solution, a large-area thermally conductive silicone pad evenly conducts the battery heat to the metal base plate for basic heat dissipation. At the same time, cooling airflow is introduced into the heat concentration area through precisely aligned heat dissipation channels for directional and enhanced cooling, which effectively solves the problem of uneven temperature distribution and significantly improves the overall heat dissipation efficiency and the accuracy of thermal management. Attached Figure Description

[0014] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a three-dimensional structural view of the present invention; Figure 2 This is a first partial three-dimensional view of the present invention; Figure 3 This is an exploded view of the structure of this utility model; Figure 4 This is a perspective view of the second partial structure of this utility model; Figure 5 This is a three-dimensional view of the third part of the structure of this utility model; Figure 6 This is a three-dimensional view of the fourth part of the structure of this utility model.

[0015] In the diagram: 1. Lithium battery pack; 2. Heat dissipation base plate; 3. Battery mounting slot; 4. Silicone contact pad; 5. Heat dissipation protrusion; 6. Sheet-shaped heat dissipation protrusion; 7. Silicone heat dissipation hole; 8. Connecting slot; 9. Connecting block; 10. Silicone support sleeve; 11. Battery heat dissipation hole; 12. Through cylinder; 13. Silicone heat dissipation groove; 14. Cooling air dissipation hole. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example 1 Please see Figures 1-6 The present invention provides the following technical solution: A lithium battery heat dissipation base plate with a thermally conductive silicone pad, comprising: Lithium battery pack 1; Heat dissipation base plate 2 is located at the lower end of lithium battery pack 1; The silicone heat dissipation assembly includes a battery mounting slot 3, a silicone contact pad 4, a heat dissipation protrusion 5, a sheet-like heat dissipation protrusion 6, silicone heat dissipation holes 7, and a battery heat dissipation hole 11. The battery mounting slot 3 is located at the upper end of the heat dissipation base plate 2, and the lithium battery pack 1 is located inside the battery mounting slot 3. The silicone contact pad 4 is fixedly connected to the lower inner wall of the battery mounting slot 3. The battery heat dissipation hole 11 is located at the upper end of the silicone contact pad 4. The heat dissipation protrusion 5 is fixedly connected to the lower end of the silicone contact pad 4 and is located at the lower end of the lithium battery pack 1. The sheet-like heat dissipation protrusion 6 is located on the circumferential surface of the heat dissipation protrusion 5. The silicone heat dissipation hole 7 is located at the upper end of the heat dissipation protrusion 5 and matches the battery heat dissipation hole 11.

[0018] In a specific embodiment of this utility model, a lithium battery heat dissipation base plate with a thermally conductive silicone pad includes a lithium battery pack 1, a heat dissipation base plate 2, and a silicone heat dissipation assembly integrated thereon. The heat dissipation base plate 2 is a load-bearing structure made of aluminum alloy, with a battery mounting groove 3 on its upper surface for positioning and accommodating the lithium battery pack 1. The lithium battery pack 1 is installed in the battery mounting groove 3 and secured by applying a preset pressure with fasteners. The core component of the silicone heat dissipation assembly is a silicone contact pad 4, which is made of highly thermally conductive silicone rubber material with a thermal conductivity of 3.2 W / (m·K). It has a sheet-like structure and is firmly fixed to the lower inner wall of the battery mounting groove 3 by adhesive or embedding methods, ensuring long-term stability. The silicone contact pad 4 does not shift under vibration and thermal cycling conditions. Multiple battery heat dissipation holes 11 are formed on the upper surface of the silicone contact pad 4, penetrating its body. These holes 11 correspond to the heat concentration areas at the bottom of the lithium battery pack 1 after battery assembly, forming a direct heat dissipation path. A heat dissipation protrusion 5 is integrally connected to the lower surface of the silicone contact pad 4. The protrusion 5 is also made of thermally conductive silicone material, extending downwards and partially embedded inside the heat dissipation base plate 2 or communicating with the lower surface of the base plate. Its axial position is aligned with the battery heat dissipation holes 11. The upper end of the protrusion 5 has a connecting structure, such as a flange or connecting block 9, which cooperates with the limiting groove on the lower inner wall of the battery mounting groove 3, ensuring reliable connection between the silicone contact pad 4 and the heat dissipation base plate 2. The heat dissipation protrusion 5 has multiple axially or spirally distributed sheet-like heat dissipation protrusions 6 on its circumferential sidewall. These sheet-like heat dissipation protrusions 6 increase the contact area between the heat dissipation protrusion 5 and the metal body of the heat dissipation base plate 2, promoting efficient heat conduction from the silicone structure to the metal base plate and diffusion. A silicone heat dissipation hole 7 is provided in the upper central area of ​​the heat dissipation protrusion 5. The silicone heat dissipation hole 7 and the battery heat dissipation hole 11 on the silicone contact pad 4 are on the same straight line and have matching diameters. Together, they form a continuous heat dissipation channel penetrating the silicone contact pad 4 and the heat dissipation protrusion 5, allowing cooling air or coolant to flow through it, achieving active enhanced heat dissipation of a specific area at the bottom of the battery. In operation, the heat generated by the lithium battery pack 1 is dissipated through the two... The system employs two efficient heat dissipation pathways: the first pathway is large-area heat conduction, where the area at the bottom of the battery pack 1 without through holes conducts heat to the heat dissipation base plate 2 through the silicone contact pad 4 in a surface contact manner; the second pathway is local channel heat dissipation, where the area at the bottom of the lithium battery pack 1 corresponding to the battery heat dissipation hole 11 allows heat to directly convect and exchange with the cooling medium through the channel formed by the hole and the silicone heat dissipation hole 7. At the same time, the heat dissipation protrusion 5 and the sheet-like heat dissipation protrusion 6 rapidly conduct the heat around the channel laterally to the entire base plate. This structure, by combining the thermally conductive silicone pad with the built-in heat dissipation channel and the enhanced heat dissipation structure, significantly improves heat dissipation efficiency and interface thermal stability, solving the problems of uneven contact, high thermal resistance, and single heat dissipation method of traditional thermally conductive pads.

[0019] Please refer to the details. Figures 1-6Both the silicone contact pad 4 and the heat dissipation protrusion 5 are made of thermally conductive silicone material.

[0020] In this embodiment, both the silicone contact pad 4 and the heat dissipation protrusion 5 are integrally molded from a high thermal conductivity silicone material or made separately and then firmly connected. The thermally conductive silicone material is based on silicone rubber and has excellent compression resilience and stress relaxation properties. Under the assembly pressure of the battery pack, it can fully deform to fit the microscopic unevenness between the bottom of the lithium battery pack 1 and the battery mounting groove 3, effectively eliminating interfacial air and reducing contact thermal resistance. At the same time, it ensures that no permanent crushing or pumping effect occurs during long-term use. The silicone contact pad 4, as a surface contact thermal conductive layer, undertakes the main heat conduction task. The heat dissipation protrusion 5 connected to it not only serves as a structural support but also, due to its material properties being the same as the thermally conductive silicone material, can quickly transfer locally concentrated heat along its axial and radial directions to the metal body of the heat dissipation base plate 2. The consistency of the two materials ensures the continuity and efficiency of the heat conduction path, avoids additional interfacial thermal resistance caused by material differences, and improves the reliability and temperature uniformity of the overall heat dissipation system.

[0021] Please refer to the details. Figures 1-6 A connecting groove 8 is provided on the lower inner wall of the battery mounting groove 3. A connecting block 9 is fixedly connected to the upper end of the heat dissipation protrusion 5. The connecting block 9 is located in the connecting groove 8. The heat dissipation protrusion 5 is connected to the silicone contact pad 4 through the connecting block 9.

[0022] In this embodiment: the connecting groove 8 is recessed into the heat dissipation base plate 2 to form a limiting structure. The upper end of the heat dissipation protrusion 5 is integrally formed or fixedly connected with a connecting block 9 that matches the shape of the connecting groove 8. The connecting block 9 is made of thermally conductive silicone material. When the silicone contact pad 4 and the heat dissipation protrusion 5 are assembled as a whole, the connecting block 9 is embedded and tightly fitted in the connecting groove 8.

[0023] Please refer to the details. Figures 1-6 The lower end of the silicone contact pad 4 is fixedly connected to multiple silicone support sleeves 10, which are respectively located inside multiple heat dissipation protrusions 5 for support.

[0024] In this embodiment: the lower end face of the silicone contact pad 4 is fixedly connected to a silicone support sleeve 10 corresponding to the internal area of ​​each heat dissipation protrusion 5. The silicone support sleeve 10 is a hollow cylindrical structure, made of thermally conductive silicone material with the same or similar properties as the silicone contact pad 4 and the heat dissipation protrusion 5. Its upper end is integrally vulcanized with the lower surface of the silicone contact pad 4 or firmly bonded with thermally conductive adhesive, and its lower end extends and supports the bottom inner wall or internal reinforcing ribs of the heat dissipation base plate 2. Multiple silicone support sleeves 10 are coaxially arranged in the internal cavities of multiple heat dissipation protrusions 5, and are connected to the heat dissipation protrusions. The inner wall of 5 is kept in close contact or has a small gap. Its main function is to provide axial support for the upper silicone contact pad 4 and the lower heat dissipation protrusion 5 when the lithium battery pack 1 is installed and pre-tightened. This prevents the thermally conductive silicone material from undergoing excessive permanent deformation or creep due to continuous compression, ensuring that the silicone contact pad 4 always maintains good elastic contact pressure and maintains a low thermal resistance interface. At the same time, the silicone support sleeve 10 itself also has a thermal conductivity function, which can directly conduct some heat from the silicone contact pad 4 through the sleeve body to the bottom structure of the heat dissipation base plate 2, forming an additional heat conduction path.

[0025] Please refer to the details. Figures 1-6 The lower end of the lithium battery pack 1 is provided with a through cylinder 12, and the lower end of the through cylinder 12 is provided with a cooling air heat dissipation hole 14, which is matched with the battery heat dissipation hole 11.

[0026] In this embodiment: The lower end shell of the lithium battery pack 1 is provided with a downwardly extending through cylinder 12. The through cylinder 12 is part of the battery shell or an independently installed heat-conducting structure. Its axial position corresponds to the battery heat dissipation hole 11 and the silicone heat dissipation hole 7. When the lithium battery pack 1 is installed in the battery mounting groove 3, the through cylinder 12 is inserted into the heat dissipation channel formed by the battery heat dissipation hole 11 and the silicone heat dissipation hole 7 to achieve precise positioning and thermal contact. The lower end face of the through cylinder 12 is provided with multiple cooling air dissipation holes 14. These cooling air dissipation holes 14 penetrate the bottom wall of the through cylinder 12 and match the diameter and distribution of the battery heat dissipation hole 11. This allows the externally introduced cooling airflow to pass through the silicone heat dissipation hole 7 and the battery heat dissipation hole 11 in sequence and enter the interior of the through cylinder 12. The airflow is then sprayed out in all directions or along a specific direction through the cooling air dissipation holes 14 to form local enhanced convection cooling, effectively removing the concentrated heat in the central area of ​​the bottom of the battery. The aperture, number and distribution angle of the cooling air dissipation holes 14 can be optimized according to the cooling airflow dynamics to achieve uniform heat dissipation or targeted cooling.

[0027] Please refer to the details. Figures 1-6 Silicone heat dissipation grooves 13 are provided on the side end of the cylinder 12.

[0028] In this embodiment, an annular or spiral silicone heat dissipation groove 13 is provided on the outer surface of the side end of the through cylinder 12. The silicone heat dissipation groove 13 extends along the circumference of the through cylinder 12 and has a certain depth. When the lithium battery pack 1 is installed in place, the through cylinder 12 is inserted into the channel formed by the battery heat dissipation hole 11 and the silicone heat dissipation hole 7. The position of the silicone heat dissipation groove 13 corresponds to the end of the sheet-like heat dissipation protrusion 6, so that the sheet-like heat dissipation protrusion 6 can be embedded or tightly attached to the silicone heat dissipation groove 13 to form a stable heat conduction interface. This structure not only enhances the mechanical positioning accuracy and connection stability between the through cylinder 12 and the heat dissipation protrusion cylinder 5, but more importantly, through the contact between the silicone heat dissipation groove 13 and the sheet-like heat dissipation protrusion 6, the heat generated by the side wall of the through cylinder 12 is efficiently transferred to the sheet-like heat dissipation protrusion 6, and then quickly led out to the metal heat dissipation base plate 2 through the heat dissipation protrusion cylinder 5, forming an efficient lateral heat conduction path and effectively expanding the heat diffusion area.

[0029] The working principle and usage process of this utility model are as follows: First, the silicone heat dissipation assembly, consisting of a silicone contact pad 4 made of thermally conductive silicone material and its integrated heat dissipation protrusion 5, connecting block 9, silicone support sleeve 10, etc., is installed in the battery mounting groove 3 of the heat dissipation base plate 2. The connecting block 9 is embedded in the connecting groove 8 on the lower inner wall of the battery mounting groove 3 for precise positioning and secure fixation, ensuring that the silicone heat dissipation hole 7 is aligned and connected with the battery heat dissipation hole 11. Then, the lithium battery pack 1 is placed in the battery mounting groove 3, ensuring its bottom is in full contact with the silicone contact pad 4. Simultaneously, the through-tube 12 at the lower end of the lithium battery pack 1 is inserted into the channel formed by the battery heat dissipation hole 11 and the silicone heat dissipation hole 7, achieving mechanical positioning and thermal coupling. At this time, the silicone heat dissipation groove 13 on the side end of the through-tube 12 is tightly fitted with the sheet-like heat dissipation protrusion 6, forming a lateral heat conduction path. When the lithium battery pack 1 generates heat during charging and discharging, the heat is efficiently dissipated through a dual mechanism: on the one hand, the heat from the large area at the bottom of the battery is dissipated through the highly thermally conductive silicone contact pad. 4. Heat is conducted to the heat dissipation base plate 2 through surface contact, achieving basic heat conduction and heat dissipation. On the other hand, the heat in the central area of ​​the bottom of the battery is concentrated and transferred through the cylinder 12. The heat through the side wall of the cylinder 12 is transferred to the heat dissipation protrusion cylinder 5 through the contact between the silicone heat dissipation groove 13 and the sheet-like heat dissipation protrusion 6, and then diffuses to the heat dissipation base plate 2. At the same time, the cooling airflow is introduced from the outside, passes through the silicone heat dissipation hole 7 and the battery heat dissipation hole 11 in sequence, enters the interior of the cylinder 12, and is ejected from the cooling air dissipation hole 14 at its lower end, performing directional forced convection cooling on the heat-concentrated area at the bottom of the battery, achieving active enhanced heat dissipation. The silicone support sleeve 10 provides internal support for the silicone contact pad 4 and the heat dissipation protrusion cylinder 5 under continuous pressure, preventing permanent deformation and ensuring long-term thermal contact reliability. The entire system combines the surface contact heat conduction of thermally conductive silicone with the active air cooling of the built-in channel, supplemented by the lateral expansion heat dissipation structure, to achieve efficient, uniform, and stable dual heat dissipation effect, solving the problems of high contact thermal resistance, uneven heat dissipation, and poor long-term stability of traditional heat dissipation methods.

[0030] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A lithium battery heat dissipation base plate with a thermally conductive silicone pad, characterized in that, include: Lithium battery pack (1); A heat dissipation base plate (2) is provided at the lower end of the lithium battery pack (1); The silicone heat dissipation assembly includes a battery mounting slot (3), a silicone contact pad (4), a heat dissipation protrusion (5), a sheet-like heat dissipation protrusion (6), a silicone heat dissipation hole (7), and a battery heat dissipation hole (11). The battery mounting slot (3) is located at the upper end of the heat dissipation base plate (2), and the lithium battery pack (1) is located inside the battery mounting slot (3). The silicone contact pad (4) is fixedly connected to the lower inner wall of the battery mounting slot (3). The battery heat dissipation hole (11) is located at the upper end of the silicone contact pad (4). The heat dissipation protrusion (5) is fixedly connected to the lower end of the silicone contact pad (4). The heat dissipation protrusion (5) is located at the lower end of the lithium battery pack (1). The sheet-like heat dissipation protrusion (6) is located on the circumferential surface of the heat dissipation protrusion (5). The silicone heat dissipation hole (7) is located at the upper end of the heat dissipation protrusion (5), and the silicone heat dissipation hole (7) matches the battery heat dissipation hole (11).

2. The lithium battery heat dissipation base plate with thermally conductive silicone pad according to claim 1, characterized in that: Both the silicone contact pad (4) and the heat dissipation protrusion (5) are made of thermally conductive silicone material.

3. A lithium battery heat dissipation base plate with a thermally conductive silicone pad according to claim 2, characterized in that: The lower inner wall of the battery mounting groove (3) is provided with a connecting groove (8), and the upper end of the heat dissipation protrusion (5) is fixedly connected with a connecting block (9). The connecting block (9) is located in the connecting groove (8), and the heat dissipation protrusion (5) is connected to the silicone contact pad (4) through the connecting block (9).

4. A lithium battery heat dissipation base plate with a thermally conductive silicone pad according to claim 3, characterized in that: The lower end of the silicone contact pad (4) is fixedly connected to a plurality of silicone support sleeves (10), and the plurality of silicone support sleeves (10) are respectively disposed in a plurality of heat dissipation protrusions (5) for support.

5. A lithium battery heat dissipation base plate with a thermally conductive silicone pad according to claim 4, characterized in that: The lower end of the lithium battery pack (1) is provided with a through tube (12), and the lower end of the through tube (12) is provided with a cooling air heat dissipation hole (14), which is matched with the battery heat dissipation hole (11).

6. A lithium battery heat dissipation base plate with a thermally conductive silicone pad according to claim 5, characterized in that: The side end of the tube (12) is provided with a silicone heat dissipation groove (13).

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