Efficient heat dissipation battery pack capable of being used for special-shaped cabin

Abstract

The utility model relates to the technical field of lithium batteries, in particular to an efficient heat dissipation battery pack capable of being used for a special-shaped cabin, which comprises one or a plurality of battery modules arranged in a bunched manner, a heat dissipation plate with a capillary heat dissipation pipe, a silica gel heat conduction pad and a positive electrode busbar are sequentially arranged at the positive electrode end of each battery module, and a heat dissipation plate with a capillary heat dissipation pipe is arranged at the negative electrode end of each battery module. The negative electrode end of the battery module is sequentially provided with a heat dissipation plate with a capillary heat dissipation pipe, a silica gel heat conduction pad and a negative electrode busbar, the battery module is used for welding the positive electrode and the negative electrode of a battery cell to the corresponding busbar positions according to the specific series-parallel connection requirements, and finally, the total positive electrode busbar and the negative electrode busbar are led out and distributed on the two sides of the battery module; the anode busbar is connected with the heat dissipation plate with the capillary heat dissipation pipe through the silica gel heat conduction pad, and the cathode busbar is connected with the heat dissipation plate with the capillary heat dissipation pipe through the silica gel heat conduction pad. The two ends of the heat dissipation pipe are led out of the battery, heat dissipation fluid media such as water or wind around electric equipment are led in, and heat at the electrode lug area with the highest temperature in the battery module is discharged in time.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and particularly relates to a high-efficiency heat dissipation battery pack that can be used in special-shaped cabins. Background Art

[0002] Currently, off-grid electrical appliance platforms are developing diversely to meet the needs of deep-sea, deep-space, and different land exploration. The systems of electrical equipment are more integrated, the space is more compact, and the operating conditions are more complex. Therefore, the comprehensive performance requirements for the power battery system are also more comprehensive and demanding, such as the high specific energy, high specific power, wide temperature range adaptability of the battery, and even the variability of the shape structure of the battery pack is also required.

[0003] When the power battery system of an electrical appliance discharges at a high specific power, the heat inside the battery system quickly accumulates in the highly compact and sealed battery cabin. If the heat generation and heat dissipation of the battery system are out of balance, the internal temperature of the battery cabin will rise sharply, leading to a thermal runaway safety accident. To avoid such accidents, starting from the development of a high-safety battery system and the design of an efficient heat dissipation battery system, the safety problems of the battery system are solved from multiple dimensions. In the design of the battery system, the shape design and arrangement method of the battery cells have a significant impact on the space utilization rate of the battery cabin and the internal heat dissipation efficiency.

[0004] In the theoretical simulation research and actual tests on battery heat generation, it is found that the current density at the tab is high, so the temperature rises rapidly, forming an obvious temperature difference with the main body area of the battery cell. Therefore, the heat flux density from the tab to the main body area of the battery cell also increases rapidly. At the same time, as the temperature of the tab increases, the heat dissipation rate of the tab to the surrounding environment also increases. In addition, since the resistance of the positive tab is higher than that of the negative tab, the temperature at the positive tab is the highest, and the heat flux density transmitted to the main body of the battery cell is always higher than that of the negative tab. It can be seen that the temperature distribution of the lithium battery is most affected by the heat flux density from the tab to the main body of the battery cell, and the heat dissipation environment at the tab is also crucial for the heat transfer from the tab to the main body of the battery cell.

[0005] In the integration of the battery system, not only the heat dissipation problem of the system needs to be considered, but also the problem of the utilization rate of the special-shaped space of the cabin needs to be considered. Therefore, starting from the shape design of the battery cells, considering the above two factors comprehensively, a battery system with high space utilization rate and high-efficiency heat dissipation is designed. Summary of the Utility Model

[0006] The purpose of the utility model is to provide a high-efficiency heat dissipation battery pack that can be used in special-shaped cabins to solve the technical problems of poor heat dissipation effect and low space utilization rate of the existing battery pack.

[0007] An efficient heat dissipation battery pack applicable to special-shaped cabins of the present utility model, the battery pack includes one or more battery modules. Among them, the battery module includes a battery cell in the middle. At the positive end of the battery cell, a positive busbar, a positive heat conduction pad, a positive heat dissipation plate, and a positive heat dissipation tube are successively arranged. At the negative end of the battery cell, a negative busbar, a negative heat conduction pad, a negative heat dissipation plate, and a negative heat dissipation tube are successively arranged. Inside the battery module, the positive and negative electrode tabs of the battery cell are welded to the corresponding busbar positions according to specific series and parallel requirements, and finally the total positive and negative busbars are led out and distributed on both sides of the battery module. The positive heat dissipation tube is arranged on the positive heat dissipation plate, and the negative heat dissipation tube is arranged on the negative heat dissipation plate. The positive busbar is connected to the positive heat dissipation plate through the positive heat conduction pad, and the negative busbar is connected to the negative heat dissipation plate through the negative heat conduction pad. Both ends of the positive heat dissipation tube and the negative heat dissipation tube extend out of the battery.

[0008] Preferably, the battery cell is a strip-shaped soft-pack battery or a metal-shell battery.

[0009] Preferably, the aspect ratio of the length to the width of the outer dimension of the battery cell is 2:1 to 10:1.

[0010] Preferably, the battery modules are arranged in a cluster combination manner.

[0011] Preferably, the battery module can be installed in a special-shaped cabin with an irregular cylindrical or polygonal structure.

[0012] Preferably, the positive heat conduction pad and the negative heat conduction pad are made of silica gel material.

[0013] Preferably, the positive heat dissipation tube and the negative heat dissipation tube are hollow metal conduits, and are distributed in a mesh pattern on the positive heat dissipation plate and the negative heat dissipation plate.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] The efficient heat dissipation battery pack applicable to special-shaped cabins includes a plurality of battery modules arranged side by side. The middle part of the battery module is a battery cell structure with opposite-side electrode tabs. The outer dimension of the battery cell is designed according to the cabin space. The battery modules are arranged in a cluster combination manner and are densely arranged inside the battery cabin. During installation, the battery cells are densely arranged along the inner contour of the battery cabin to ensure the full utilization of the internal space of the cabin. At the same time, the positive and negative electrode tabs of the battery cell are distributed on both sides of the battery module. When the battery module discharges, the high-temperature area is concentrated on both sides of the module, which is convenient for heat dissipation. The heat dissipation method of the battery pack adopts the heat conduction technology of heat dissipation capillary tubes, and introduces the fluid medium around the electrical equipment, such as water or wind, etc., to the positive and negative electrode tab areas where the heat is concentrated in the battery module to achieve heat dissipation and timely discharge. Description of the Drawings

[0016] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments:

[0017] Figure 1 Fig. is a schematic structural diagram of an embodiment of an efficient heat dissipation battery pack that can be used for a special-shaped cabin of the present utility model;

[0018] Figure 2 Fig. is a schematic split structure diagram of an embodiment of an efficient heat dissipation battery pack that can be used for a special-shaped cabin of the present utility model.

[0019] In the figure: 100, battery module; 10, battery cell; 11, positive bus bar; 12, positive heat conduction pad; 13, positive heat dissipation plate; 14, positive heat dissipation tube; 21, negative bus bar; 22, negative heat conduction pad; 23, negative heat dissipation plate; 24, negative heat dissipation tube. Specific embodiments

[0020] This part will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The function of the drawings is to supplement the description of the text part of the specification, enabling people to intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but it cannot be construed as a limitation on the protection scope of the present utility model.

[0021] As Figure 1-2 shown, an efficient heat dissipation battery pack that can be used for a special-shaped cabin of the present utility model includes one or more battery modules 100. The battery module includes a battery cell 10 in the middle. The positive end of the battery module 100 is successively provided with a positive bus bar 11, a positive heat conduction pad 12, a positive heat dissipation plate 13, and a positive heat dissipation tube 14. The negative end of the battery module 100 is successively provided with a negative bus bar 21, a negative heat conduction pad 22, a negative heat dissipation plate 23, and a negative heat dissipation tube 24. Inside the battery module 100, the positive and negative electrode tabs of the battery cells are welded to the corresponding bus bar positions according to the series-parallel requirements, and the total positive and negative bus bars are led out and distributed on both sides of the battery module. The positive heat dissipation tube 14 is arranged on the positive heat dissipation plate 13, and the negative heat dissipation tube 24 is arranged on the negative heat dissipation plate 23. The positive bus bar 11 is connected to the positive heat dissipation plate 13 through the positive heat conduction pad 12, and the negative bus bar 21 is connected to the negative heat dissipation plate 23 through the negative heat conduction pad 22. Both ends of the positive heat dissipation tube 14 and the negative heat dissipation tube 24 extend out of the battery.

[0022] An efficient heat dissipation battery pack applicable to special-shaped cabins of the present utility model includes a plurality of battery modules arranged side by side. The battery cells of the battery module are of a battery cell structure with opposite-side outgoing ear tabs. The external dimensions of the battery cells are designed according to the cabin space. The battery modules are arranged in a cluster combination manner and are densely arranged inside the battery cabin. During installation, the battery modules are densely arranged along the inner contour of the battery cabin to ensure the full utilization of the internal space of the cabin. At the same time, the positive and negative electrodes of the battery cells are distributed on both sides of the battery module. When the battery module discharges, the high-temperature areas are concentrated on both sides of the module, facilitating heat dissipation. The heat dissipation method of the battery pack adopts the heat conduction technology of heat dissipation capillary tubes, and the fluid medium around the power consumption platform is introduced to the area where the positive and negative electrode ear tabs are concentrated in temperature to achieve heat dissipation. Specifically, a positive electrode busbar 11, a positive electrode heat conduction pad 12, a positive electrode heat dissipation plate 13, and a positive electrode heat dissipation tube 14 are sequentially arranged on the positive electrode of the battery cell, and a negative electrode busbar 21, a negative electrode heat conduction pad 22, a negative electrode heat dissipation plate 23, and a negative electrode heat dissipation tube 24 are sequentially arranged on the negative electrode. Among them, the positive electrode ear tab inside the battery cell is connected to the positive electrode busbar 11, the negative electrode ear tab is connected to the negative electrode busbar 21, the positive electrode busbar 11 is connected to the positive electrode heat dissipation plate 13 through the positive electrode heat conduction pad 12, the negative electrode busbar 21 is connected to the negative electrode heat dissipation plate 23 through the negative electrode heat conduction pad 22, and both ends of the positive electrode heat dissipation tube 14 and the negative electrode heat dissipation tube 24 extend out of the battery. The heat dissipation method of this battery pack is to use the water or air fluid medium around the power consumption platform to timely discharge the heat concentrated in the temperature area, avoiding the heat diffusion from the ear tab area inside the battery to the main body part of the battery cell, resulting in thermal runaway of the battery.

[0023] The efficient heat dissipation battery pack applicable to special-shaped cabins includes one or more battery modules arranged in a "cluster" manner. On the positive end of the battery module, a heat dissipation plate with a capillary heat dissipation tube, a silica gel heat conduction pad, and a positive electrode busbar are sequentially arranged. On the negative end of the battery module, a heat dissipation plate with a capillary heat dissipation tube, a silica gel heat conduction pad, and a negative electrode busbar are sequentially arranged. The battery module is formed by arranging square battery cells with a certain length-width ratio and a certain thickness in a "cluster" manner. According to specific series-parallel requirements, the positive and negative electrodes of the battery cells are welded to the corresponding busbar positions, and finally the total positive and negative electrode busbars are led out and distributed on both sides of the battery module. The positive electrode busbar is connected to the heat dissipation plate with a capillary heat dissipation tube through the silica gel heat conduction pad, and the negative electrode busbar is connected to the heat dissipation plate with a capillary heat dissipation tube through the silica gel heat conduction pad. Both ends of the heat dissipation tube extend out of the battery, introducing the water or air and other heat dissipation fluid media around the electrical equipment and timely discharging the heat at the area of the ear tabs with the highest temperature in the battery module.

[0024] In a preferred embodiment, referring to Figure 1-2, the battery cell 100 of the high-efficiency heat dissipation battery pack applicable to special-shaped cabins is a strip-shaped soft-pack battery or a metal-shell battery. The aspect ratio of the outer dimensions of the battery cell 100 is 2:1 to 10:1. The battery module 100 can be installed in a special-shaped cabin with an irregular cylindrical or polygonal structure. The positive thermal pad 12 and the negative thermal pad 22 are made of silica gel material. The positive heat dissipation tube 14 and the negative heat dissipation tube 24 are hollow metal conduits, which are distributed in a mesh pattern on the positive heat dissipation plate and the negative heat dissipation plate, increasing the heat dissipation area, enabling the fluid to diffuse therein, and taking away the heat in a timely manner.

[0025] The high-efficiency heat dissipation battery pack also has the following characteristics:

[0026] 1. The battery cell with opposite-side tabbing not only has good rate performance, but also the heat will disperse to both sides, which is beneficial to the overall heat dissipation of the battery system;

[0027] 2. The strip-shaped batteries are densely distributed inside the battery cabin, which is beneficial to the rational use of space and improves the energy density of the entire battery system;

[0028] 3. The heat dissipation structure is integrated with the structural design of the power consumption platform. Without changing the overall external structure, the surrounding fluid medium is introduced into the tab area where the heat of the battery system is most concentrated for efficient heat dissipation, improving the safety performance of the battery pack;

[0029] 4. The design of the battery grouping method and the heat dissipation method realizes the positive correlation between the operating conditions of the power consumption device and the heat dissipation rate. For example, when the power consumption device discharges at a high power, the heat generation of the battery system accelerates, the rate of the platform increases, and then the fluid rate in the capillary network increases accordingly, and the heat exchange accelerates, taking away the heat in a timely manner.

[0030] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the knowledge scope of those of ordinary skill in the art in the said technical field, various changes can also be made without departing from the gist of the present invention.

Claims

1. An efficient heat dissipation battery pack applicable to special-shaped cabins, the battery pack comprising one or more battery modules, characterized in that: The battery module includes battery cells in the middle. At the positive extreme of the battery module, a positive bus bar, a positive heat conducting pad, a positive heat sink plate, and a positive heat dissipation tube are sequentially provided. At the negative extreme of the battery module, a negative bus bar, a negative heat conducting pad, a negative heat sink plate, and a negative heat dissipation tube are sequentially provided. Inside the battery module, the positive and negative electrode tabs of the battery cells are welded to the corresponding bus bar positions according to the series-parallel requirements, and the total positive and negative bus bars are led out and distributed on both sides of the battery module. The positive heat dissipation tube is arranged on the positive heat sink plate, and the negative heat dissipation tube is arranged on the negative heat sink plate. The positive bus bar is connected to the positive heat sink plate through the positive heat conducting pad, and the negative bus bar is connected to the negative heat sink plate through the negative heat conducting pad. Both ends of the positive heat dissipation tube and the negative heat dissipation tube extend outside the battery.

2. The high-efficiency heat dissipation battery pack applicable to a special-shaped cabin as described in claim 1, wherein The battery cells are strip-shaped soft-pack batteries or metal shell batteries.

3. The high-efficiency heat dissipation battery pack applicable to a special-shaped cabin as claimed in claim 1, wherein, The aspect ratio of the length to the width of the outer dimension of the battery cells is 2:1 to 10:

1.

4. The high-efficiency heat dissipation battery pack applicable to a special-shaped cabin as claimed in claim 1, wherein, The battery modules are arranged in a clustered combination manner.

5. The high-efficiency heat dissipation battery pack applicable to a special-shaped cabin as claimed in claim 1, wherein The battery module can be installed in a special-shaped cabin body with an irregular cylindrical or polygonal structure.

6. The high-efficiency heat dissipation battery pack applicable to a special-shaped cabin as claimed in claim 1, wherein The positive heat conducting pad and the negative heat conducting pad are made of silicone material.

7. The high-efficiency heat dissipation battery pack applicable to a special-shaped cabin as described in claim 1, wherein The positive heat dissipation tube and the negative heat dissipation tube are hollow metal conduits, and are distributed in a mesh pattern on the positive heat sink plate and the negative heat sink plate.

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