A special heating plate structure to ensure uniform heating of lithium battery modules

Abstract

The name of the present invention is a special heating plate structure that ensures uniform heating of lithium battery modules. It belongs to the field of lithium battery module heating technology. It mainly solves the problem of inconsistent temperatures in various areas on the contact surface between the heating plate and the module battery cell of the existing heating plate. Its main features are: it includes a heating element and a side plate; the side plate is made of aluminum profile; the side plate is provided with a cavity for installing the heating element, and the heating element is installed in the cavity; the inner surface of the side plate is flat, with a longitudinal groove in the middle, and a small piece of thermal conductive silicone pad is installed in the groove; a large piece of thermal conductive silicone pad with an area larger than the area of ​​the small piece of thermal conductive silicone pad but smaller than the area of ​​the inner surface of the side plate is fixed on the inner surface of the side plate. The present invention has the characteristics of small temperature difference of the battery cell during the heating process of the lithium battery module, ensuring the cycle life of the battery cell, fast heating speed and greatly shortening the waiting time for lithium battery operation under low temperature conditions. It is mainly used for uniform heating of lithium-ion power battery modules in low temperature environments.

Description

Technical Field

[0001] The present invention belongs to the technical field of lithium battery module heating, and in particular relates to a new structure of a special heating plate which can ensure the heating uniformity of a lithium battery module. Background Art

[0002] Lithium-ion power batteries are widely used in new energy pure electric vehicles and hybrid new energy vehicles. With the maturity of technology, the simplification of processes, and market demand, new requirements have been placed on the performance, service life, and heating efficiency of lithium batteries at low temperatures. Inadequate low-temperature performance and large temperature differences during operation seriously affect the lifespan of lithium battery systems. Improving the uniform heating function of the battery system is the fundamental solution to these problems. The present invention, a novel structure of a heating plate specifically designed for lithium battery modules, can largely address the problems of poor temperature consistency and insufficient heating efficiency of lithium batteries, significantly improving the environmental adaptability of lithium battery packs in low-temperature environments. Summary of the Invention

[0003] The purpose of the present invention is to provide a new structure of a special heating plate to ensure the uniform heating of the lithium battery module, so as to achieve basically consistent temperature in any area on the contact surface between the heating plate and the module, thereby improving the heating consistency of the lithium battery system.

[0004] The technical solution of the present invention is: a special heating plate structure that ensures uniform heating of lithium battery modules, including a heating element and a side plate, characterized in that: the side plate is made of aluminum profile; the side plate is provided with a cavity for installing the heating element, and the heating element is installed in the cavity; the inner surface of the side plate is flat, with a longitudinal groove in the middle, and a small thermally conductive silicone pad is installed in the groove; a large thermally conductive silicone pad with an area larger than the area of ​​the small thermally conductive silicone pad but smaller than the area of ​​the inner surface of the side plate is fixed on the inner surface of the side plate.

[0005] The side panels described in the technical solution of the present invention are provided with a positive heating harness and a negative heating harness electrically connected to the heating element.

[0006] The cavity described in the technical solution of the present invention is arranged longitudinally along the middle of the outer surface of the side panel.

[0007] The cavity described in the technical solution of the present invention protrudes from the outer surface of the side panel.

[0008] The large thermally conductive silicone pad described in the technical solution of the present invention is rectangular, has a height the same as that of the side plate, and a width smaller than that of the side plate.

[0009] The side panels described in the technical solution of the present invention are made of aluminum alloy, with a length of 100~2000mm, a width of 60mm~300mm, a total thickness of 5mm~30mm, a thickness of 0.5~5mm on both sides, and a wall thickness of 0.5mm~5mm; the width of the cavity is 10mm~50mm, and the height is 2mm~10mm; the depth of the groove is 0.05mm~3mm, the width is 10mm~200mm, and the length is 100~2000mm.

[0010] The heating element described in the technical solution of the present invention is made of PTC.

[0011] The thermal conductivity of the small thermally conductive silicone pad described in the technical solution of the present invention is 0.1-5 W / mk.

[0012] The thermal conductivity of the large thermally conductive silicone pad described in the technical solution of the present invention is 0.5-10 W / mk and the thickness is 0.3-4 mm.

[0013] The length of the dedicated heating plate structure described in the technical solution of the present invention is 0.3-5 meters.

[0014] The beneficial effects of the present invention are: achieving basically consistent temperature in any area on the contact surface between the heating plate and the module, improving the heating consistency of the lithium battery system, and enabling the lithium battery system to be quickly heated to a suitable temperature at low temperatures, thereby enabling normal operation without reducing its lifespan.

[0015] The present invention has the characteristics of small temperature difference of battery cells during heating of lithium battery modules, ensuring cycle life of battery cells, fast heating speed and greatly shortening waiting time of lithium battery operation under low temperature conditions. It is mainly used for uniform heating of lithium-ion power battery modules under low temperature conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0017] Figure 1 It is a schematic diagram of the cross-sectional structure of the heating plate structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the overall structure of the heating plate structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the installation on the module of the present invention.

[0020] In the figure: 1. Side panel; 2. Large thermal conductive silicone pad; 3. Small thermal conductive silicone pad; 4. Heating element; 5. Positive heating harness; 6. Negative heating harness; 7. End plate; 8. Battery cell. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] like Figures 1 to 3 As shown in the figure, an embodiment of a dedicated heating plate structure for ensuring uniform heating of lithium battery modules according to the present invention comprises side plates 1, heating elements 4, small thermally conductive silicone pads 3, large thermally conductive silicone pads 2, positive electrode heating harnesses 5, and negative electrode heating harnesses 6. When in use, these plates are placed on both sides of the module, their dimensions matching the module, facing the battery cells 8, and welded to the end plates, which also improves the overall strength of the module.

[0023] The side panel 1 is made of an aluminum alloy profile. Its inner surface is flat except for the groove, its outer surface is flat except for the cavity, and its two side surfaces are flat. The length of the side panel 1 ranges from 100 to 2000 mm, its width ranges from 60 to 300 mm, its thickness including the cavity ranges from 5 to 30 mm, and its thickness excluding the cavity ranges from 0.5 to 5 mm, with a wall thickness of 0.5 to 5 mm. The cavity is used to mount the heating element 4, which is longitudinally arranged along the middle of the outer surface of the side panel 1 and protrudes from the outer surface of the side panel 1. The width of the cavity ranges from 10 to 50 mm and the height ranges from 2 to 10 mm. The groove is used to mount a small thermally conductive silicone pad 3. It is a rectangular groove longitudinally arranged along the middle of the inner surface of the side panel 1. The groove has a depth of 0.05 to 3 mm, a width of 10 to 200 mm, and a length of 100 to 2000 mm. The thickness of the side panel 1 excluding the cavity is 0.5-5 mm, which facilitates welding and fixing of the side panel 1 and the end panel 7, ensures good contact between the side panel 1 and the battery cell 8, and increases the overall strength of the module.

[0024] Heating element 4 is made of PTC, but other materials are also acceptable. Install a heating element 4 of appropriate power into the cavity of side panel 1 and insulate it with insulating paper or other materials. Seal both ends with structural adhesive. Lead out the positive and negative heating harnesses 5 and 6. The positive and negative heating harnesses 5 and 6 can be connected to the positive and negative terminals of the battery pack module or to an external power source to generate the required electrical energy. Heating element 4 generates heat to heat the module.

[0025] The small thermally conductive silicone pad 3 is rectangular and sized to fit the groove. Its thermal conductivity should be within the range of 0.1-5 W / mk. Adhere the small thermally conductive silicone pad 3 to the groove in the side panel 1 and fill it in. This pad reduces the heat transfer from the center of the side panel 1 to the battery cells 8. During heating, the temperature in the center of the heating plate is roughly the same as that on both sides, reducing the temperature difference between the battery cells 8 in the center of the module and those on the sides.

[0026] The large thermally conductive silicone pad 2 is rectangular, with a height the same as the length of the side panel 1 and a width smaller than the width of the side panel 1, but should cover the battery cell 8. The thermal conductivity of the large thermally conductive silicone pad 2 is 0.5~10W / mk, and the thickness is 0.3~4mm. The large thermally conductive silicone pad 2 is pasted on the small thermally conductive silicone pad 3 and the inner surface of the side panel 1. The edge of the large thermally conductive silicone pad 2 is 5~30mm away from the side of the side panel 1 and can be used as the welding connection area between the side panel 1 and the end panel 7. The thermal conductivity of the large thermally conductive silicone pad 2 should not be lower than or slightly higher than the thermal conductivity of the small thermally conductive silicone pad 3. The large thermally conductive silicone pad 2 can serve as a thermal bridge between the side panel 1 and the battery cell 8, and can also fill the gap between the two to ensure uniform heat conduction.

[0027] As can be seen, the lithium battery module heating plate structure of the present invention features an innovative groove design and is filled with small thermally conductive silicone pads 3, thereby ensuring that the temperature in the center and on both sides remains essentially equal, avoiding the situation where uneven temperatures lead to poor cell consistency. The large thermally conductive silicone pads 2 on the outside effectively fill the gap between the side plate 1 and the battery cell 8, similarly ensuring uniform heat transfer. Compared with traditional heating plate installation methods, this greatly reduces the temperature difference when heating the battery pack.

[0028] The length of the dedicated heating plate structure can be processed according to the length of the existing aluminum profile, such as 0.2-5 meters. The overall cutting length of the profile can be controlled according to actual requirements to obtain side panels 1 of different lengths to meet the installation requirements of lithium battery modules of different lengths or heights.

[0029] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A special heating plate structure for ensuring uniform heating of a lithium battery module, comprising a heating element (4) and a side plate (1), characterized in that: The side panel (1) is made of aluminum profile; the side panel (1) is provided with a cavity for installing the heating element (4), the cavity is longitudinally arranged along the middle of the outer surface of the side panel (1), the cavity protrudes from the outer surface of the side panel (1), and the heating element (4) is installed in the cavity; the inner surface of the side panel (1) is flat, and a longitudinal groove is provided in the middle, and a small thermal conductive silicone pad (3) is installed in the groove; a large thermal conductive silicone pad (2) having an area larger than the area of ​​the small thermal conductive silicone pad (3) but smaller than the area of ​​the inner surface of the side panel (1) is fixed on the inner surface of the side panel (1); the thermal conductivity coefficient of the large thermal conductive silicone pad (2) is higher than the thermal conductivity coefficient of the small thermal conductive silicone pad (3); the side panel (1) is provided with a positive heating harness (5) and a negative heating harness (6) electrically connected to the heating element (4); when in use, the dedicated heating plate structure is placed on both sides of the module, facing the battery core (8), and welded to the end plate (7).

2. A dedicated heating plate structure for ensuring uniform heating of a lithium battery module according to claim 1, characterized in that: The heating element (4) is installed in the cavity of the side plate (1), insulated with insulating paper, and sealed at both ends with structural adhesive.

3. The dedicated heating plate structure for ensuring uniform heating of a lithium battery module according to claim 2, characterized in that: The side plate (1) is made of aluminum alloy profile, the inner surface is flat except for the groove, and the outer surface is flat except for the cavity.

4. The dedicated heating plate structure for ensuring uniform heating of a lithium battery module according to claim 3, characterized in that: The large thermally conductive silicone pad (2) is rectangular, has a height that is the same as that of the side panel (1), and a width that is smaller than that of the side panel (1).

5. A dedicated heating plate structure for ensuring uniform heating of a lithium battery module according to any one of claims 1 to 4, characterized in that: The side plate (1) is made of aluminum alloy, with a length of 100-2000 mm, a width of 60-300 mm, a total thickness of 5-30 mm, a thickness of 0.5-5 mm on both sides, and a wall thickness of 0.5-5 mm; the width of the cavity is 10-50 mm, and the height is 2-10 mm; the depth of the groove is 0.05-3 mm, the width is 10-200 mm, and the length is 100-2000 mm.

6. A dedicated heating plate structure for ensuring uniform heating of a lithium battery module according to any one of claims 1 to 4, characterized in that: The heating element (4) is made of PTC.

7. A dedicated heating plate structure for ensuring uniform heating of a lithium battery module according to any one of claims 1 to 4, characterized in that: The thermal conductivity of the small thermally conductive silica gel pad (3) is 0.1-5 W / mk.

8. The dedicated heating plate structure for ensuring uniform heating of a lithium battery module according to claim 7, characterized in that: The small piece of thermal conductive silicone pad (3) is rectangular and is pasted into the groove of the side plate (1) and the groove is filled.

9. A dedicated heating plate structure for ensuring uniform heating of a lithium battery module according to any one of claims 1-4 and 8, characterized in that: The thermal conductivity of the large thermally conductive silicone pad (2) is 0.5-10 W / mk and the thickness is 0.3-4 mm.

10. A dedicated heating plate structure for ensuring uniform heating of a lithium battery module according to any one of claims 1-4 and 8, characterized in that: The length of the special heating plate structure is 0.3-5 meters.

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