Lithium ion battery capable of rapidly and uniformly dissipating heat

Abstract

The lithium ion battery capable of rapidly and uniformly radiating comprises a lithium ion battery protection shell and a battery cell arranged in the protection shell, a heat conduction insulation structure is arranged outside the protection shell, and a heat conduction structure is arranged in the battery cell. According to the lithium ion battery capable of rapidly and uniformly dissipating heat, the heat-conducting ceramic chip is embedded in the battery cell, so that the temperature in the battery cell can be rapidly conducted to the bottom of the battery, the accumulation of heat in the lithium battery is reduced, and the temperature difference in the battery is reduced; and the heat conduction structure is arranged outside the battery, so that heat in the lithium ion battery can be quickly absorbed, and the heat dissipation effect of the lithium ion battery is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of power battery or energy storage battery technology, and in particular to a lithium-ion battery with rapid and uniform heat dissipation. Background Technology

[0002] Electrochemical energy storage technology, as a key technology for new power systems, is mainly used for peak and frequency regulation, peak shaving and valley filling, and smoothing fluctuations in renewable energy. Lithium-ion batteries have gradually become the mainstream in electrochemical energy storage due to their high energy density, long cycle life, and low cost. To meet the demands for higher capacity and further cost reduction in electrochemical energy storage systems, manufacturers are continuously increasing the capacity of individual lithium-ion batteries. However, the heat generation of large-capacity lithium-ion batteries also increases significantly, making battery heat dissipation a growing concern. Furthermore, current battery module designs generally employ bottom liquid cooling for heat dissipation, and in actual operation, the temperature difference between the top and bottom of the battery can reach up to 8°C. Prolonged operation of lithium-ion batteries in environments with uneven temperature distribution and high temperatures will severely impact their lifespan. Utility Model Content

[0003] To address the aforementioned technical problems, this invention proposes a lithium-ion battery capable of rapid and uniform heat dissipation.

[0004] The present invention relates to a lithium-ion battery with rapid and uniform heat dissipation, comprising a lithium-ion battery protective casing and a battery cell disposed within the protective casing, wherein a thermally conductive insulating structure is disposed outside the protective casing and a thermally conductive structure is disposed inside the battery cell.

[0005] In one embodiment, the thermally conductive insulating structure includes a thermally conductive insulating film.

[0006] In one embodiment, the thermally conductive structure is a thermally conductive ceramic sheet.

[0007] In one embodiment, the protective housing includes a top cover, a housing wall, and a base, with the thermally conductive insulating film disposed on the outside of the housing wall.

[0008] In one embodiment, the shell wall includes an inner wall and an outer wall, with a phase change material filling the space between the inner wall and the outer wall.

[0009] In one embodiment, the base is provided with a groove, and the thermally conductive ceramic sheet is embedded in the groove.

[0010] In one embodiment, the thermally conductive insulating structure further includes a thermally conductive insulating sheet disposed above the top cover, and the top cover and the thermally conductive insulating sheet are bonded together by a high-temperature resistant adhesive.

[0011] In one embodiment, the top cover is welded to the shell wall, and the shell wall is integrally cast to the base.

[0012] In one embodiment, the thermally conductive insulating film is a thermally conductive insulating silicone cloth.

[0013] In one embodiment, the thermally conductive ceramic sheet is an aluminum nitride ceramic sheet or an alumina ceramic sheet.

[0014] In one embodiment, the thermally conductive insulating sheet is provided with a positive electrode post slot, a negative electrode post slot, and an explosion-proof valve slot corresponding to the battery cell structure.

[0015] Compared with existing technologies, the lithium-ion battery of this invention with rapid and uniform heat dissipation embeds a thermally conductive ceramic sheet inside the cell, which can quickly conduct the temperature inside the cell to the bottom of the battery, reducing the accumulation of heat inside the lithium battery and reducing the temperature difference inside the battery; the battery is provided with a thermally conductive structure on the outside, which can quickly absorb the heat inside the lithium-ion battery, greatly improving the heat dissipation effect of the lithium-ion battery.

[0016] The above-mentioned technical features can be combined in various technically feasible ways to generate new implementation schemes, as long as the purpose of this utility model can be achieved. Attached Figure Description

[0017] The present invention will now be described in more detail based on embodiments that are not limiting only, and with reference to the accompanying drawings. Wherein:

[0018] Figure 1 A schematic diagram of the overall structure of a lithium-ion battery according to the present invention is shown;

[0019] Figure 2 Showing Figure 1 The diagram shows the internal structure of a lithium-ion battery.

[0020] Figure 3 Showing Figure 1 A schematic diagram of the groove on the top of the base of the lithium-ion battery shown;

[0021] Figure 4 Showing Figure 1 The diagram shows a top view of the lithium-ion battery casing.

[0022] Figure 5 Showing Figure 1 The diagram shows the top cover structure of a lithium-ion battery.

[0023] Figure 6 Showing Figure 1 The diagram shows the structure of the battery thermally conductive insulating sheet.

[0024] In the figures, identical components are labeled with the same reference numerals. The figures are not drawn to scale.

[0025] The attached figures are labeled as follows:

[0026] 1. Protective shell; 2. Battery cell; 3. Top cover; 4. Positive terminal; 5. Negative terminal; 6. Explosion-proof valve; 7. Thermally conductive ceramic plate; 8. Negative electrode plate; 9. Positive electrode plate; 10. Diaphragm; 11. Shell wall; 111. Inner wall; 112. Outer wall; 113. Phase change material; 12. Thermally conductive insulating film; 13. Base; 14. Groove; 15. Thermally conductive insulating sheet; 16. Positive terminal slot; 17. Negative terminal slot; 18. Explosion-proof valve slot. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, as long as there is no conflict, the various embodiments and features of the present invention can be combined with each other, and the resulting technical solutions are all within the protection scope of the present invention.

[0028] The parts not mentioned in this utility model can be achieved by adopting or referencing existing technologies.

[0029] like Figure 1 and Figure 2 As shown, this utility model proposes a lithium-ion battery with fast and uniform heat dissipation, including a protective shell 1 of the lithium-ion battery and a cell 2 disposed inside the protective shell 1, wherein a thermally conductive insulating structure is provided outside the protective shell and a thermally conductive structure is provided inside the cell.

[0030] In an optional embodiment, the thermally conductive insulating structure includes a thermally conductive insulating film 12. The thermally conductive insulating film 12 has beneficial properties such as high thermal conductivity, high electrical insulation, tensile strength, and abrasion resistance, which not only improves the heat dissipation efficiency of the lithium-ion battery, but also significantly enhances its protective effect compared to traditional blue films.

[0031] In an optional embodiment, the thermally conductive structure embedded inside the battery cell 2 is a thermally conductive ceramic sheet 7. For example... Figure 2 As shown, the battery cell 2 includes a positive electrode post 4, a negative electrode post 5, and an explosion-proof valve 6, and from the inside out, it includes a negative electrode plate 8, a positive electrode plate 9, and a separator 10. A thermally conductive ceramic sheet 7 is embedded inside the battery cell 2 (preferably, the thermally conductive ceramic sheet 7 is located inside the negative electrode plate 8), which can quickly conduct the temperature inside the battery cell to the bottom of the battery, reducing heat accumulation inside the lithium battery, lowering the temperature difference inside the battery, and facilitating uniform heat dissipation inside the battery. Simultaneously, this structure can be combined with the current liquid-cooled pack method of dissipating heat from the bottom of the lithium-ion battery, further achieving good temperature uniformity, high heat dissipation efficiency, and good battery safety.

[0032] In one specific embodiment, the thermally conductive ceramic sheet 7 can be an aluminum nitride thermally conductive ceramic sheet.

[0033] In other alternative embodiments, the aluminum nitride thermally conductive ceramic sheet can also be replaced with other thermally conductive ceramic sheets with high thermal conductivity, insulation and other properties, such as alumina ceramic sheets, silicon carbide thermally conductive ceramic sheets, etc.

[0034] Continue to refer to Figure 2 In an optional embodiment, the protective housing 1 includes a top cover 3, a housing wall 11, and a base 13. A thermally conductive insulating film 12 is disposed on the outside of the housing wall 11 to quickly absorb heat inside the lithium-ion battery.

[0035] like Figure 4 As shown, in an optional embodiment, the shell wall 11 includes a double-layer structure of an inner wall 111 and an outer wall 112, with a phase change material 113 filled between the inner wall 111 and the outer wall 112. The phase change material 113 can absorb the heat generated by the lithium-ion battery. When the external heat dissipation conditions cannot meet the heat dissipation requirements of the lithium battery, the heat can be absorbed through the specific heat capacity characteristics of the phase change material to achieve the purpose of cooling the lithium-ion battery.

[0036] Optionally, the phase change material should have a melting point between 30-100℃, a boiling point >300℃, and a large specific heat capacity. Specifically, sodium sulfate decahydrate can be selected as the phase change material.

[0037] Inside a battery pack, when a lithium battery experiences thermal runaway, heat can be rapidly transferred to adjacent batteries, potentially triggering thermal runaway in those batteries as well. Phase change materials, however, can absorb a significant amount of heat, preventing heat transfer to the battery's interior and improving battery safety during use.

[0038] In addition, the double-layer shell can improve the mechanical performance of lithium batteries. Even if the outer shell is damaged, it will not cause leakage of lithium battery electrolyte and active materials, and can even ensure that the battery continues to operate for a short time.

[0039] In an optional embodiment, the thickness of the inner wall 111 is 0.5-0.8 mm, and the thickness of the outer wall 112 is 0.8-1.2 mm.

[0040] Optionally, to prevent the phase change material from overflowing the battery pack due to its increased volume when it melts, preferably, the amount of phase change material filling does not exceed 80% of the net volume of the space between the inner wall 111 and the outer wall 112, providing the necessary space for the phase change material to melt and undergo phase change. In a specific embodiment, the thermally conductive insulating film 12 can be a thermally conductive insulating silicone cloth.

[0041] In other alternative embodiments, the thermally conductive insulating film 12 may also be replaced with other materials that have high thermal conductivity, high electrical insulation, tensile strength and wear resistance.

[0042] In an optional embodiment, a groove 14 is provided on the base 13, and a heat-conducting ceramic sheet 7 is embedded in the groove 14. Figure 3 As shown in the schematic embodiment, the base 13 is provided with two symmetrical grooves 14. The specific number and shape of the grooves can be adjusted according to the shape and size of the battery base.

[0043] The thermally conductive ceramic sheet 7 has excellent thermal conductivity, which can quickly conduct the heat generated inside the battery cell 2 to the battery base 13. By dissipating heat from the battery base 13, the internal temperature of the battery cell 2 during use is reduced, thereby improving the battery's safety performance. At the same time, the thermally conductive ceramic sheet has high insulation properties, which can accelerate the heat conduction inside the battery cell without causing an internal short circuit in the battery cell 2.

[0044] like Figure 2 and Figure 4 As shown, in an optional embodiment, the thermally conductive insulation structure further includes a thermally conductive insulating sheet 15 disposed above the top cover 3, the top cover 3 and the thermally conductive insulating sheet 15 being bonded together by a high-temperature resistant adhesive, such as polyacrylic acid.

[0045] By replacing the top cover of a traditional lithium-ion battery with a thermally conductive insulating sheet 15, the thermally conductive insulating sheet 15 accelerates heat dissipation from the top of the lithium-ion battery, thereby reducing the temperature difference between the top and bottom of the battery during use and improving the efficiency of the lithium-ion battery.

[0046] like Figure 5 As shown, the thermally conductive insulating sheet 15 is provided with a positive electrode post slot 16, a negative electrode post slot 17 and an explosion-proof valve slot 18 respectively, corresponding to the structure of the battery cell 2, so that the thermally conductive insulating sheet 15 can be further attached to the top cover 3.

[0047] In an optional embodiment, the top cover 3 is welded to the shell wall 11, and the shell wall 11 is integrally cast to the base 13.

[0048] Although the accompanying drawings show a schematic diagram of a lithium-ion battery with a square structure, the lithium-ion battery of this invention is not limited to a square battery and can be applied to lithium-ion batteries of different shapes depending on the actual situation.

[0049] This utility model's lithium-ion battery uses thermally conductive insulating sheets and films to replace the top cover and blue film of traditional lithium-ion batteries. The thermally conductive insulating sheets and films have higher thermal conductivity, enabling them to quickly absorb heat from inside the lithium-ion battery and significantly improve heat dissipation. Simultaneously, a thermally conductive ceramic sheet is embedded inside the cell, rapidly conducting heat from the cell's interior to the bottom of the battery, reducing heat accumulation and lowering the internal temperature difference. This bottom-based heat dissipation from the cell, combined with the liquid-cooled pack structure's bottom-based heat dissipation method, further achieves better temperature uniformity, higher heat dissipation efficiency, and improved battery safety.

[0050] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "comprising" or "including," and similar words used in this invention, mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms "connected" or "linked," and similar words, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0051] Therefore, those skilled in the art should recognize that although the present invention has been described with reference to preferred embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A lithium-ion battery with rapid and uniform heat dissipation, characterized in that, The invention includes a lithium-ion battery protective casing and a battery cell disposed within the protective casing. The protective casing has a thermally conductive insulating structure on its exterior, and the battery cell has a thermally conductive structure inside. The thermally conductive structure is a thermally conductive ceramic sheet disposed on the inner side of the negative electrode plate of the battery cell. The protective casing includes a top cover, a casing wall, and a base. The base has a groove, and the thermally conductive ceramic sheet is embedded in the groove.

2. The lithium-ion battery with rapid and uniform heat dissipation according to claim 1, characterized in that, The thermally conductive and insulating structure includes a thermally conductive and insulating film.

3. The lithium-ion battery with rapid and uniform heat dissipation according to claim 2, characterized in that, The thermally conductive insulating film is disposed on the outside of the shell wall.

4. The lithium-ion battery with rapid and uniform heat dissipation according to claim 1, characterized in that, The shell wall includes an inner wall and an outer wall, and a phase change material is filled between the inner wall and the outer wall.

5. The lithium-ion battery with rapid and uniform heat dissipation according to claim 1, characterized in that, The thermally conductive and insulating structure also includes a thermally conductive insulating sheet disposed above the top cover, and the top cover and the thermally conductive insulating sheet are bonded together with a high-temperature resistant adhesive.

6. The lithium-ion battery with rapid and uniform heat dissipation according to claim 1, characterized in that, The top cover is welded to the shell wall, and the shell wall is integrally cast to the base.

7. The lithium-ion battery with rapid and uniform heat dissipation according to claim 1, characterized in that, The thermally conductive ceramic sheet is an aluminum nitride ceramic sheet or an alumina ceramic sheet.

8. The lithium-ion battery with rapid and uniform heat dissipation according to claim 5, characterized in that, The thermally conductive insulating sheet is provided with positive electrode post slots, negative electrode post slots and explosion-proof valve slots corresponding to the structure of the battery cell.

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