Lithium battery capable of rapidly dissipating heat

Abstract

The invention discloses a lithium battery capable of rapidly dissipating heat, which comprises a heat conduction shell, an upper cover, a battery cell, a first heat conduction sheet, a second heat conduction sheet, an isolation support plate and a connecting copper bar, a plurality of second fixing plates are convexly arranged on the inner side wall of the first fixing plate located on the outermost side and the two side walls of the first fixing plate located in the middle at intervals respectively, the two ends of the battery cell are detachably embedded in the battery cell fixing grooves respectively, and the first heat-conducting fin is arranged at the inner bottom of the heat-conducting shell and abuts against the bottom of the battery cell; the second heat-conducting fins are arranged between the front and back adjacent battery cells, the lower end parts of the second heat-conducting fins abut against the first heat-conducting fins, the isolation supporting plates are arranged at the upper end parts of the battery cells, and the two ends of the connecting copper bars are fixedly connected with the pole columns at the upper end parts of the battery cells respectively. According to the technical scheme, the cost is low, and the heat balance and heat dissipation requirements of the lithium battery pack can be guaranteed in a limited space.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a lithium battery capable of rapidly dissipating heat. Background Art

[0002] ‌A lithium battery pack is composed of multiple lithium battery cells connected in a certain circuit (series or parallel). Each battery cell is monitored and managed by the integrated management system (BMS) to ensure the balance and safety between the battery cells.‌ The voltage and capacity of the lithium battery pack can be flexibly combined according to demand, and the voltage usually ranges from 12V to 1000V.‌

[0003] Lithium battery packs can provide higher voltage and capacity in applications and are an important part of lithium-ion battery technology. They are widely used in mobile devices, electric vehicles, energy storage systems and other fields, meeting the needs of different devices for high energy density, lightweight and environmentally friendly batteries.

[0004] Conventional lithium battery packs are usually cooled by air or water. However, due to space problems or waterproof requirements, small lithium battery packs on the market cannot be cooled by air or water, which seriously affects the service life and safety of lithium battery packs. Summary of the invention

[0005] The main purpose of the present invention is to provide a lithium battery that can dissipate heat quickly, aiming to solve the technical problem that the existing small lithium battery pack cannot be cooled by air or water due to space problems or waterproof requirements, which seriously affects the service life and safety of the lithium battery pack.

[0006] To achieve the above-mentioned purpose, the lithium battery capable of rapid heat dissipation proposed in the present invention comprises a heat-conducting shell, an upper cover, a battery cell, a first heat-conducting sheet, a second heat-conducting sheet, an isolation support plate and a connecting copper bar, wherein the upper cover is detachably covered on the upper end of the heat-conducting shell, the inner bottom of the heat-conducting shell is provided with three first fixing plates at intervals along the length direction, the bottoms of the first fixing plates are all connected to the inner bottom of the heat-conducting shell at intervals, the inner side wall of the first fixing plate located at the outermost side and the two side walls of the first fixing plate located in the middle are respectively provided with a plurality of second fixing plates at intervals, and a battery cell fixing groove is formed between two adjacent second fixing plates located on the first fixing plate, The two ends of the battery cell are respectively detachably embedded in the battery cell fixing groove, the first heat conductive sheet is arranged at the inner bottom of the heat conductive shell, and the first heat conductive sheet is abutted against the bottom of the battery cell, the second heat conductive sheet is arranged between two adjacent front and rear battery cells, and the second heat conductive sheet is abutted against the side wall of the battery cell, the lower end of the second heat conductive sheet is abutted against the first heat conductive sheet, the isolation support plate is arranged at the upper end of the battery cell, and the upper end of the isolation support plate is recessed with a plurality of accommodating grooves adapted to the connecting copper busbars, the connecting copper busbars are respectively embedded in the accommodating grooves, and the two ends of the connecting copper busbars are respectively fixedly connected to the poles at the upper end of the battery cell.

[0007] Optionally, the first heat conductive sheet and the second heat conductive sheet are both formed of heat conductive silicone sheets.

[0008] Optionally, the first heat conducting sheet and the second heat conducting sheet are both formed of graphene heat conducting sheets.

[0009] Optionally, a plurality of heat sinks are protruding from the upper end wall of the connecting copper busbar.

[0010] Optionally, the heat-conducting shell and the upper cover are made of aluminum alloy.

[0011] Optionally, a plurality of heat dissipation grooves are recessed on the outer side wall of the heat-conducting housing.

[0012] The technical solution of the present invention has the following beneficial effects: the technical solution of the present invention is that three first fixing plates are arranged at intervals along the length direction through the inner bottom of the heat-conducting outer shell, the bottoms of the first fixing plates are connected to the inner bottom of the heat-conducting outer shell at intervals, and the inner side wall of the outermost first fixing plate and the two side walls of the first fixing plate in the middle are respectively convexly provided with a plurality of second fixing plates at intervals, a battery cell fixing groove is formed between two adjacent second fixing plates on the first fixing plate, two ends of the battery cell are respectively detachably embedded in the battery cell fixing groove, a first heat-conducting sheet is arranged on the inner bottom of the heat-conducting outer shell, and the first heat-conducting sheet abuts against the bottom of the battery cell, a second heat-conducting sheet is arranged between two adjacent front and rear battery cells, and the second heat-conducting sheets abut against the side walls of the battery cell, a lower end of the second heat-conducting sheet abuts against the first heat-conducting sheet, an isolation support plate is arranged at the upper end of the battery cell, and an isolation support plate is arranged. A plurality of accommodating grooves matched with the connecting copper bars are recessed at the upper end of the support plate, and the connecting copper bars are respectively embedded in the accommodating grooves, and the two ends of the connecting copper bars are respectively fixedly connected to the poles at the upper ends of the battery cells, and the second heat conducting sheet between the battery cells conducts heat, which effectively ensures the heat conduction of the battery cells, thereby ensuring the thermal balance of the battery cells, and the heat of the battery cells is conducted to the shell through the first heat conducting sheet at the bottom of the heat conducting shell, and the heat conduction of the first heat conducting sheet, the second heat conducting sheet and the heat conducting shell is used to conduct heat to the lithium battery pack for rapid heat dissipation. At the same time, the heat dissipation structure of the connecting copper bar not only increases the cross-sectional area of ​​the overcurrent in a limited space, but also enhances the heat dissipation performance of the battery cell pole, thereby effectively accelerating the heat dissipation speed of the lithium battery, and effectively ensuring the service life and safety of the lithium battery. The technical solution of the present invention has low cost and can ensure the thermal balance and heat dissipation requirements of the lithium battery pack in a limited space. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0014] Figure 1 This is a schematic diagram of the overall structure of a lithium battery capable of rapid heat dissipation according to an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of a lithium battery capable of rapid heat dissipation according to an embodiment of the present invention; Figure 3 This is a schematic diagram of a partially exploded structure of a lithium battery capable of rapid heat dissipation according to an embodiment of the present invention; Figure 4 This is another partial structural schematic diagram of a lithium battery capable of rapid heat dissipation according to an embodiment of the present invention; Figure 5This is a schematic structural diagram of a copper busbar for connecting a lithium battery capable of rapid heat dissipation according to an embodiment of the present invention.

[0015] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0018] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0019] The invention provides a lithium battery capable of rapidly dissipating heat.

[0020] like Figures 1 to 5As shown, in one embodiment of the present invention, the lithium battery capable of rapid heat dissipation comprises a heat-conducting shell 101, an upper cover 102, a battery cell 103, a first heat-conducting sheet 104, a second heat-conducting sheet 105, an isolation support plate 106 and a connecting copper bar 107. The upper cover 102 is detachably covered on the upper end of the heat-conducting shell 101. The inner bottom of the heat-conducting shell 101 is provided with three first fixing plates 108 at intervals along the length direction. The bottoms of the first fixing plates 108 are all connected to the inner bottom of the heat-conducting shell 101 at intervals. The inner side wall of the outermost first fixing plate 108 and the two side walls of the first fixing plate 108 in the middle are respectively provided with a plurality of second fixing plates 109 at intervals. A battery cell fixing member is formed between two adjacent second fixing plates 109 on the first fixing plate 108. The fixed groove 110, both ends of the battery cell 103 are detachably embedded in the battery cell fixed groove 110, the first heat conductive sheet 104 is arranged at the inner bottom of the heat conductive shell 101, and the first heat conductive sheet 104 is abutted against the bottom of the battery cell 103, the second heat conductive sheet 105 is arranged between the front and rear two adjacent battery cells 103, and the second heat conductive sheet 105 is abutted against the side wall of the battery cell 103, and the lower end of the second heat conductive sheet 105 is abutted against the first heat conductive sheet 104, the isolation support plate 106 is arranged at the upper end of the battery cell 103, and the upper end of the isolation support plate 106 is recessed with a plurality of accommodating grooves (not shown) adapted to the connecting copper busbar 107, the connecting copper busbar 107 is respectively embedded in the accommodating grooves, and the two ends of the connecting copper busbar 107 are respectively fixedly connected to the poles at the upper end of the battery cell 103.

[0021] Specifically, the first heat conductive sheet 104 and the second heat conductive sheet 105 are both formed of thermally conductive silicone sheets, which have a high thermal conductivity and can effectively improve the heat transfer efficiency. The thermal conductivity range is usually between 0.8W / MK and 8.0W / MK, and the specific value depends on the material formula, production process and application requirements. 12. The thermal conductivity of high-performance thermal conductive silicone gaskets can reach 3.0W / m·K or even higher, which is suitable for occasions with extremely strict heat dissipation requirements, such as thermal management of high-end electronic equipment.

[0022] Thermally conductive silicone sheets can significantly reduce contact thermal resistance and make heat transfer smoother by filling the gap between the heating part and the heat dissipation part. Since air is a poor conductor of heat, thermally conductive silicone sheets can squeeze air out of the contact surface, so that the contact surface between the heat source and the heat sink is better and more fully in contact, thereby achieving a better heat dissipation effect. Due to its high thermal conductivity and ability to reduce contact thermal resistance, thermally conductive silicone sheets can quickly dissipate the heat of the battery core, effectively speeding up the heat dissipation of lithium batteries and effectively ensuring the service life and safety of lithium batteries.

[0023] Specifically, the first heat conducting sheet 104 and the second heat conducting sheet 105 are both formed of graphene heat conducting sheets.

[0024] Graphene thermal conductive sheet has extremely high thermal conductivity, and its thermal conductivity coefficient is usually between 3000 and 5000 W / (m·K), or even higher.

[0025] Graphene thermal conductive sheet is a two-dimensional material composed of carbon atoms, which has excellent thermal conductivity. In recent years, with the continuous development of graphene preparation technology, its thermal conductivity has been widely studied and applied. Specifically, the thermal conductivity of a complete single-layer graphene can reach up to 5300 W / m·K, which is one of the best thermal conductive materials known. For graphene powders containing defects and functional groups, the thermal conductivity coefficient will vary slightly depending on the preparation method, but the thermal conductivity is still much higher than traditional thermal conductive materials such as copper and aluminum.

[0026] The high efficiency of graphene heat conductive sheet makes it an ideal choice in the field of heat dissipation. It can quickly transfer heat from the heat source to the surface of the heat sink, and dissipate the heat into the air through the heat sink, thereby effectively managing heat and improving the performance and stability of the device.

[0027] In addition, the thermal conductivity of graphene thermal conductive sheet also has a certain anisotropy, that is, its thermal conductivity is different in the plane and perpendicular to the plane. Due to the two-dimensional structure of graphene, heat is mainly transmitted along the plane direction, which makes the thermal conductivity of graphene in a specific direction even better.

[0028] In summary, graphene thermal conductive sheet can quickly dissipate the heat of the battery cell with its extremely high thermal conductivity and unique thermal conductivity, effectively speeding up the heat dissipation of lithium batteries and effectively ensuring the service life and safety of lithium batteries.

[0029] Specifically, a plurality of heat sinks 1071 are protruding from the upper end wall of the connecting copper busbar 107, which can increase the heat dissipation area of ​​the connecting copper busbar, not only increasing the cross-sectional area of ​​the overcurrent in a limited space, but also enhancing the heat dissipation performance of the battery cell pole, thereby effectively accelerating the heat dissipation speed of the lithium battery, so that the heat of the battery cell can be quickly dissipated, effectively accelerating the heat dissipation speed of the lithium battery, and effectively ensuring the service life and safety of the lithium battery.

[0030] Specifically, the heat-conducting housing 101 and the upper cover 102 are made of aluminum alloy, which has excellent thermal conductivity. Its thermal conductivity is usually between 140-200 W / (m·K), and the thermal conductivity of some aluminum alloys such as 6061 aluminum round tubes can reach 156-209 W / (m·K). The reason why aluminum alloy can become a high-quality thermal conductive material is mainly due to the special properties of aluminum. Aluminum is an active metal with good thermal conductivity. In aluminum alloys, aluminum and other metal elements form alloy grains, and the gaps between these grains are very small, so that heat can be transferred very quickly in the aluminum alloy.

[0031] In addition, the thermal conductivity of aluminum alloy is also affected by the addition of other metal elements. Different alloying elements and heat treatment processes can further adjust and optimize the thermal conductivity of aluminum alloy to meet the needs of different applications, thereby quickly dissipating the heat of the battery cell, effectively speeding up the heat dissipation of lithium batteries, and effectively ensuring the service life and safety of lithium batteries.

[0032] Specifically, a plurality of heat dissipation grooves 1011 are concavely disposed on the outer side wall of the heat-conducting housing 101, which can effectively increase the heat dissipation area of ​​the heat-conducting housing, thereby effectively accelerating the heat dissipation speed of the lithium battery.

[0033] Specifically, the working principle and process of the present invention are: Three first fixing plates are arranged at intervals along the length direction through the inner bottom of the heat-conducting shell, the bottoms of the first fixing plates are connected to the inner bottom of the heat-conducting shell at intervals, a plurality of second fixing plates are convexly arranged at intervals on the inner side wall of the outermost first fixing plate and the two side walls of the first fixing plate in the middle, a battery cell fixing groove is formed between two adjacent second fixing plates on the first fixing plate, two ends of the battery cell are respectively detachably embedded in the battery cell fixing groove, a first heat-conducting sheet is arranged at the inner bottom of the heat-conducting shell, and the first heat-conducting sheet abuts against the bottom of the battery cell, a second heat-conducting sheet is arranged between two adjacent front and rear battery cells, and the second heat-conducting sheets abut against the side walls of the battery cell, a lower end of the second heat-conducting sheet abuts against the first heat-conducting sheet, an isolation support plate is arranged at the upper end of the battery cell, and a plurality of The copper busbars are connected to the receiving grooves that are compatible with them, and the copper busbars are respectively embedded in the receiving grooves. The two ends of the copper busbars are respectively fixedly connected to the poles at the upper ends of the battery cells. The second heat conducting sheets between the battery cells conduct heat, which effectively ensures the heat conduction of the battery cells, thereby ensuring the thermal balance of the battery cells. The heat of the battery cells is conducted to the shell through the first heat conducting sheet at the bottom of the heat conducting shell, and the heat of the first heat conducting sheet, the second heat conducting sheet and the heat conducting shell is conducted to the lithium battery pack for rapid heat dissipation. At the same time, the heat dissipation structure of the copper busbar not only increases the cross-sectional area of ​​the overcurrent in a limited space, but also enhances the heat dissipation performance of the battery cell poles, thereby effectively accelerating the heat dissipation speed of the lithium battery, and effectively ensuring the service life and safety of the lithium battery. The technical solution of the present invention has low cost and can ensure the thermal balance and heat dissipation requirements of the lithium battery pack in a limited space.

[0034] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A lithium battery capable of rapid heat dissipation, characterized in that: The invention comprises a heat-conducting shell, an upper cover, a battery cell, a first heat-conducting sheet, a second heat-conducting sheet, an isolation support plate and a connecting copper bar, wherein the upper cover is detachably covered on the upper end of the heat-conducting shell, and the inner bottom of the heat-conducting shell is provided with three first fixing plates at intervals along the length direction, and the bottoms of the first fixing plates are connected to the inner bottom of the heat-conducting shell at intervals, and the inner side wall of the first fixing plate located at the outermost side and the two side walls of the first fixing plate located in the middle are respectively provided with a plurality of second fixing plates at intervals, and a battery cell fixing groove is formed between two adjacent second fixing plates located on the first fixing plate, and the two ends of the battery cell are respectively detachable. The first heat conductive sheet is arranged at the inner bottom of the heat conductive shell, and the first heat conductive sheet abuts against the bottom of the battery cell, the second heat conductive sheet is arranged between two adjacent front and rear battery cells, and the second heat conductive sheets abut against the side walls of the battery cell, the lower end of the second heat conductive sheet abuts against the first heat conductive sheet, the isolation support plate is arranged at the upper end of the battery cell, and the upper end of the isolation support plate is recessed with a plurality of accommodating grooves adapted to the connecting copper bars, the connecting copper bars are respectively embedded in the accommodating grooves, and the two ends of the connecting copper bars are respectively fixedly connected to the poles at the upper end of the battery cell.

2. The lithium battery capable of rapid heat dissipation according to claim 1, characterized in that: The first heat conducting sheet and the second heat conducting sheet are both formed of heat conducting silicone sheets.

3. The lithium battery capable of rapid heat dissipation according to claim 1, characterized in that: The first heat conducting sheet and the second heat conducting sheet are both formed of graphene heat conducting sheets.

4. The lithium battery capable of rapid heat dissipation according to claim 1, characterized in that: A plurality of heat sinks are protrudingly provided on the upper end wall of the connecting copper bar.

5. The lithium battery capable of rapid heat dissipation according to claim 1, characterized in that: The heat-conducting shell and the upper cover are made of aluminum alloy.

6. The lithium battery capable of rapid heat dissipation according to claim 5, characterized in that: The outer side wall of the heat-conducting housing is concavely provided with a plurality of heat dissipation grooves.

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