Battery cell module

Abstract

The utility model provides a battery cell module. The battery cell module comprises a box body (1), a cooling part (2), a battery cell (11) and a heat dissipation structure, the cooling part (2) and the battery cell (11) are both arranged in the box body (1), the cooling part (2) is connected with the top of the box body (1), an evaporation cavity (21) is formed in the cooling part (2), a heat conduction part (23) is arranged in the evaporation cavity (21), the evaporation cavity (21) is filled with an evaporant (22), the heat dissipation structure comprises a cover plate (31), the cover plate (31) is arranged at the top of the box body (1), and the cover plate (31) is arranged on the top of the box body (1). The cover plate (31) is provided with a condensation cavity (32), and the evaporation cavity (21) is communicated with the condensation cavity (32). According to the battery cell module provided by the utility model, the complexity of a heat dissipation system is greatly reduced by arranging the cooling part (2) and the heat dissipation structure, so that the problems that the heat dissipation system of the existing battery cell module is complicated in structure and large in occupied space are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery heat dissipation technical field, specifically, relate to a kind of battery module. BACKGROUND

[0002] With the development of new energy, the demand for batteries is increasing. As the energy output unit of the battery pack, the safe, stable, efficient and reliable operation of the battery module is the premise and basis for the normal work of the battery pack. In order to improve the energy density of the battery pack, the size of the single battery cell is increasing, and the number of battery cells is also increasing. The arrangement of internal structural parts of the battery module is becoming more and more compact, and the heat dissipation problem is attracting more and more attention. In order to improve the life and safety of the battery pack, the battery module needs to be quickly and efficiently cooled to reduce the temperature of the battery pack and prevent the battery pack from overheating.

[0003] The existing battery module heat dissipation structure mainly includes air cooling, liquid cooling and heat conduction pad heat dissipation. The air cooling heat dissipation structure is simple, but the air cooling heat dissipation structure occupies a large space and has low space utilization. Although the liquid cooling heat dissipation method can effectively reduce the temperature of the central region of the battery cell, the system is complex, and special liquid cooling pipeline, cooling liquid, cooling equipment and complex control circuit are required. This not only occupies a large amount of space inside the battery module, but also increases the manufacturing and installation cost. The heat conduction pad heat dissipation method transmits the heat generated by the battery cell to the heat sink by installing a heat conduction pad between the battery cell and the heat sink. However, the thermal resistance of the heat conduction pad is large, the heat dissipation efficiency is limited, and an additional heat sink is required, which increases the space occupation and cost. SUMMARY

[0004] The main purpose of the utility model is to provide a battery module that can significantly simplify the heat dissipation structure, fully utilize the internal space of the battery module, and solve the problem of complex structure and large space occupation of the existing battery module heat dissipation system.

[0005] In order to achieve the above purpose, according to one aspect of the utility model, a battery module is provided, which comprises a box body, a cooling part, a battery cell and a heat dissipation structure. The cooling part and the battery cell are arranged in the box body. The cooling part is connected to the top of the box body. The cooling part has an evaporation cavity inside. The evaporation cavity has a heat conduction part. The evaporation cavity is filled with an evaporant. The heat dissipation structure comprises a cover plate. The cover plate is arranged on the top of the box body. The cover plate has a condensation cavity. The evaporation cavity and the condensation cavity are connected.

[0006] Further, the ratio of the width of the condensation cavity to the width of the evaporation cavity is 1:5 to 1:2.

[0007] Further, the ratio of the vertical cross-sectional area of the condensation cavity to the vertical cross-sectional area of the evaporation cavity is 1:3 to 2:5.

[0008] Further, the ratio of the height of the evaporation cavity to the height of the battery cell is 1:2-2:3.

[0009] Further, the battery cell is multiple, and the cooling part is arranged between two adjacent battery cells.

[0010] Further, the heat-conducting part is immersed in the evaporant, and the heat-conducting part is in contact with the side wall and the bottom wall of the evaporation cavity.

[0011] Further, the heat-conducting part is provided with heat-conducting fins, and the heat-conducting fins are arranged on the side of the heat-conducting part away from the side wall or the bottom wall of the evaporation cavity.

[0012] Further, the ratio of the height of the heat-conducting part immersed in the evaporant to the liquid level of the evaporant is 1:4-2:3.

[0013] Further, the heat-conducting part has a capillary structure.

[0014] Further, the heat-conducting part is provided with heat-conducting fins, and the heat-conducting fins have a capillary structure.

[0015] Further, multiple heat-conducting fins are arranged on the heat-conducting part.

[0016] Further, the heat-conducting fins are circular, semicircular, rectangular, square, or polygonal.

[0017] Further, the heat dissipation structure further comprises a heat dissipation part, the heat dissipation part is arranged on the cover plate, and the condensation cavity is arranged in the heat dissipation part.

[0018] Further, the heat dissipation part is further provided with heat dissipation fins, and the condensation cavity is arranged in the heat dissipation fins.

[0019] Further, the cooling part is in heat-conducting contact with the temperature peak area of the battery cell.

[0020] Further, the cooling part comprises a first side wall and a second side wall, the area of the first side wall is smaller than the area of the second side wall, and the second side wall is polygonal or U-shaped.

[0021] The technical scheme of the utility model is mainly used for packaging the battery module and fixing and protecting the battery and the cooling part inside the box. The cooling part is used for cooling the battery, the evaporation cavity is arranged inside the cooling part, the evaporant is filled in the evaporation cavity, the high temperature generated by the battery is conducted to the evaporation cavity, the evaporant in the evaporation cavity is changed from liquid state to gaseous state, thereby absorbing heat to cool the battery. The heat conduction part is used for conducting the heat of the inner wall of the evaporation cavity to the evaporant, the heat exchange area is further increased by arranging the heat conduction part, the heat distribution is more uniform, thereby improving the efficiency of the evaporation cooling. The cover plate is used for closing the box on one hand, and the condensation cavity is integrated on the cover plate on the other hand, thereby providing the space for condensing the gaseous evaporant into liquid. The battery module provided by the utility model greatly reduces the complexity of the heat dissipation system by arranging the cooling part and the heat dissipation structure, thereby solving the problems of the complex structure of the heat dissipation system of the existing battery module and the large occupied space. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings accompanying the specification of the utility model form a part of the utility model and are used to provide a further understanding of the utility model, and the illustrative embodiments of the utility model and the description thereof are used to explain the utility model, and do not constitute an improper limitation on the utility model. In the drawings:

[0023] Figure 1 The overall structure schematic view of the battery module of one embodiment of the utility model is shown;

[0024] Figure 2 The sectional view of the battery module of one embodiment of the utility model is shown;

[0025] Figure 3 The structure schematic view of the cooling part of the battery module of one embodiment of the utility model is shown;

[0026] Figure 4 The structure schematic view of the cover plate of the battery module of one embodiment of the utility model is shown;

[0027] Figure 5 The structure schematic view of the heat dissipation fin of the battery module of one embodiment of the utility model is shown;

[0028] Figure 6 The overall structure schematic view of the heat conduction part of the battery module of one embodiment of the utility model is shown;

[0029] Figure 7 The structure schematic view of the cooling part of the battery module of one embodiment of the utility model is shown;

[0030] Figure 8 The side view of the battery module of one embodiment of the utility model is shown; and

[0031] Figure 9 The overall structure schematic diagram of the heat conduction part of the battery cell module in one embodiment of the utility model is shown.

[0032] Among them, the above-mentioned drawing includes the following sign:

[0033] 1, box body;11, battery cell;12, bottom plate;13, top plate;14, side plate;2, cooling part;21, evaporation cavity;22, evaporant;23, heat conduction part;24, heat conduction fin;25, first side wall;26, second side wall;31, cover plate;32, condensation cavity;33, heat dissipation part;34, heat dissipation fin;4, cooling cavity. Specific implementation

[0034] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0035] Combined with the Figures 1 to 9 As shown in the figure, the utility model provides a kind of battery cell module, which includes box body 1, cooling part 2, battery cell 11 and heat dissipation structure, cooling part 2 and battery cell 11 are all arranged in box body 1, cooling part 2 is connected with the top of box body 1, evaporation cavity 21 is arranged inside cooling part 2, heat conduction part 23 is arranged in evaporation cavity 21, evaporant 22 is filled in evaporation cavity 21, heat dissipation structure includes cover plate 31, cover plate 31 is arranged in the top of box body 1, condensation cavity 32 is arranged on cover plate 31, evaporation cavity 21 is communicated with condensation cavity 32.

[0036] In the above technical solution, the box 1 is mainly used for packaging the battery cell module, and fixes and protects the battery cell 11 and the cooling part 2 inside the box 1. The cooling part 2 is used for cooling the battery cell 11, and the evaporation cavity 21 is arranged inside the cooling part 2, and the evaporation agent 22 is filled in the evaporation cavity 21. The high temperature generated by the battery cell 11 is conducted to the evaporation cavity 21, so that the evaporation agent 22 in the evaporation cavity 21 changes from liquid state to gaseous state, thereby absorbing heat to cool the battery cell 11. The heat conduction part 23 is used for conducting the heat of the inner wall of the evaporation cavity 21 to the evaporation agent 22. By arranging the heat conduction part 23, the heat exchange area is further increased, the heat distribution is more uniform, and the heat conduction efficiency is improved, thereby improving the evaporation cooling efficiency. The cover plate 31 is used for closing the box 1, and the condensation cavity 32 is integrated on the cover plate 31, which provides a space for the gaseous evaporation agent 22 to condense into liquid. The evaporation cavity 21 and the condensation cavity 32 are communicated. The evaporation agent 22 in the evaporation cavity 21 absorbs heat and evaporates into gaseous state, and rises to the condensation cavity 32. Since the temperature of the condensation cavity 32 is lower, the gaseous evaporation agent 22 releases heat and liquefies in the condensation cavity 32, and then drops into the evaporation cavity 21. The battery cell module provided by the utility model greatly reduces the complexity of the heat dissipation system by arranging the cooling part 2 and the heat dissipation structure, thereby solving the problems of complex structure and large space occupation of the existing battery cell module heat dissipation system.

[0037] In an embodiment of the utility model, the ratio of the width of the condensation cavity 32 to the width of the evaporation cavity 21 is 1:5~1:2.

[0038] In the above technical solution, the evaporation cavity 21 is mainly responsible for absorbing heat from the battery cell, so a larger width is needed to enhance the heat exchange effect, and the condensation cavity 32 is responsible for condensing the steam back to liquid state and dissipating heat to the environment. If the width of the condensation cavity 32 is too small, it may limit the circulation of the steam, affect the condensation efficiency, and cause the overall heat dissipation performance of the system to decrease. If the width of the condensation cavity 32 is too large, it may increase unnecessary volume and weight. When the ratio of the width of the condensation cavity 32 to the width of the evaporation cavity 21 is 1:5~1:2, the evaporation cavity 21 has good heat exchange efficiency, the condensation cavity 32 can effectively exchange heat, the steam circulation is smooth, and by controlling the width ratio of the condensation cavity 32 to the evaporation cavity 21, the size and layout of the component can be optimized, the material use can be reduced, and the manufacturing cost can be reduced under the premise of meeting the heat dissipation demand.

[0039] In an embodiment of the utility model, the ratio of the height of the evaporation cavity 21 to the height of the battery cell 11 is 1:2~2:3.

[0040] In the above technical solution, the battery mainly generates heat in the middle part of the battery cell 11 during operation, and therefore the lowest part of the evaporation cavity 21 needs to cover the middle part of the battery cell 11 to ensure the heat dissipation effect of the temperature peak area. By setting the ratio of the height of the evaporation cavity 21 to the height of the battery cell 11 in the range of 1:2 to 2:3, the evaporation cavity 21 can fully cover the temperature peak area of the battery cell, improve the cooling effect of the battery cell, prolong the service life of the battery cell, and improve the safety of the battery.

[0041] In one embodiment of the present application, the ratio of the vertical cross-sectional area of the condensation cavity 32 to the vertical cross-sectional area of the evaporation cavity 21 is 1:3 to 2:5.

[0042] In the above technical solution, the larger cross-sectional area of the evaporation cavity 21 can provide more surface contact with the battery cell, thereby more effectively absorbing heat, and the relatively smaller cross-sectional area of the condensation cavity 32 helps to concentrate heat dissipation and improve heat dissipation efficiency. By limiting the ratio of the vertical cross-sectional area of the evaporation cavity 21 to the vertical cross-sectional area of the condensation cavity 32 to be between 1:3 and 2:5, it is ensured that the evaporant can fully absorb heat and evaporate in the evaporation cavity 21, and also smoothly enter the condensation cavity 32 for condensation and heat release, thereby maintaining good circulation of the evaporant 22 and improving the efficiency of the cooling system.

[0043] In one embodiment of the present application, the battery cell 11 is a plurality of battery cells, and the cooling part 2 is arranged between two adjacent battery cells 11.

[0044] In the above technical solution, the cooling part 2 is arranged between two adjacent battery cells 11, which can make full use of the space between the battery cells 11, making the structure of the entire battery cell module more compact. In addition, the cooling part 2 between the two battery cells 11 can cool the battery cells 11 on both sides of the cooling part 2 at the same time, and from the perspective of a single battery cell 11, the battery cell 11 can also be cooled by the cooling parts 2 on both sides at the same time, thereby further improving the cooling efficiency of the cooling part 2.

[0045] In one embodiment of the present application, the heat-conducting part 23 is immersed in the evaporant 22, and the heat-conducting part 23 is in contact with the side wall and the bottom wall of the evaporation cavity 21.

[0046] In the above technical solution, the heat-conducting part 23 is used to conduct heat from the side wall and the bottom wall of the evaporation cavity 21 to the evaporant 22. Compared with directly conducting heat from the evaporation cavity 21 to the evaporant 22, the heat-conducting part 23 further increases the heat exchange area and improves the heat conduction efficiency, thereby improving the efficiency of the evaporation cooling.

[0047] In one embodiment of the present application, the heat-conducting part 23 is partially immersed in the evaporant 22, or fully immersed in the evaporant 22.

[0048] In the above technical solution, when the heat conduction part 23 is partially immersed in the evaporating agent 22, the immersed part directly contacts the liquid evaporating agent, and can rapidly absorb the heat generated by the battery cell 11 through capillary action and the high thermal conductivity of the evaporating agent 22, thereby improving the efficiency of heat exchange. Since the heat conduction part 23 only needs to be immersed to a sufficient depth to ensure thermal contact, the effect of uniformly guiding heat to the evaporating agent 22 to achieve evaporative cooling can be achieved, thereby reducing the amount of evaporating agent 22 used and reducing cooling costs. Since the part of the heat conduction part 23 that is not immersed in the evaporating agent 22 has a higher temperature than the air part of the condensation cavity 32, according to the principles of thermodynamics, the part of the heat conduction part 23 that is not immersed in the evaporating agent 22 can accelerate the upward speed of the evaporating agent vapor, promoting the rapid flow of the vapor in the direction of the condensation cavity 32. When the heat conduction part 23 is completely immersed in the evaporating agent 22, the entire heat conduction part 23 is in the liquid phase of the evaporating agent 22, which increases the heat absorption area, allowing more heat to be rapidly absorbed and conducted away by the evaporating agent 22, thereby improving the cooling capacity of the entire system.

[0049] In one embodiment of the present application, the heat conduction part 23 is provided with a heat conduction fin 24, which is arranged on the side of the heat conduction part 23 away from the side wall or bottom wall of the evaporation cavity 21.

[0050] In the above technical solution, the arrangement of the heat conduction fin 24 further increases the contact area between the heat conduction part 23 and the evaporating agent 22, allowing the heat to be in full contact with the evaporating agent 22, thereby significantly improving the evaporative cooling efficiency.

[0051] In one embodiment of the present application, the ratio of the height of the heat conduction part 23 immersed in the evaporating agent 22 to the liquid level of the evaporating agent 22 is 1:4 to 2:3.

[0052] In the above technical solution, if the depth of the heat conduction part 23 immersed in the evaporating agent 22 is too shallow, the contact area between the heat conduction part 23 and the evaporating agent 22 is reduced, and the heat conduction efficiency of the heat conduction part 23 to the evaporating agent 22 is reduced, thereby affecting the cooling effect. Conversely, if the immersion is too deep, the vapor channel may be flooded with liquid evaporating agent, hindering the upward flow of the vapor and reducing the cooling efficiency. The height of the heat conduction part 23 immersed in the evaporating agent 22 and the liquid level of the evaporating agent 22 are set to be in the range of 1:4 to 2:3, which can ensure that under different heat load conditions, the evaporating agent 22 can be in full contact with the heat conduction part 23, and the vapor flow will not be hindered, thereby maintaining the stable operation of the cooling system.

[0053] In one embodiment of the present application, the heat conduction part 23 has a capillary structure.

[0054] In the above technical solution, when the heat-conducting part 23 is partially immersed in the evaporating agent 22, the heat-conducting part 23 with the capillary structure can transport the evaporating agent 22 to the area above the heat-conducting part 23 which is not immersed in the evaporating agent 22, so that the evaporating agent 22 can be fully contacted with the high-temperature air in the evaporation cavity 21 and evaporated, thereby improving the evaporation efficiency and cooling effect of the evaporating agent 22 in the air area.

[0055] In an embodiment of the utility model, the heat-conducting part 23 is provided with heat-conducting fins 24, and the heat-conducting fins 24 have capillary structures.

[0056] In the above technical solution, the heat-conducting fins 24 increase the heat-conducting area of the heat-conducting part 23, and when the heat-conducting part 23 and the heat-conducting fins 24 are partially immersed in the evaporating agent 22, the heat-conducting fins 24 with the capillary structure can transport the evaporating agent 22 to the area above the heat-conducting fins 24 which is not immersed in the evaporating agent 22, further expanding the contact area of the heat-conducting fins 24 and the high-temperature air, thereby improving the evaporation efficiency and cooling effect of the evaporating agent 22.

[0057] In an embodiment of the utility model, the heat-conducting fins 24 are arranged on the heat-conducting part 23 at intervals.

[0058] In the above technical solution, the increase in the number of heat-conducting fins 24 can significantly increase the area of the heat exchange surface of the heat-conducting part 23, and heat can be transferred from the battery cell 11 to the evaporating agent 22 more quickly, thereby improving the cooling efficiency; since the evaporation efficiency of the local evaporating agent 22 is limited, by arranging the heat-conducting fins 24 at intervals, the distribution of heat flow on the heat-conducting part 23 can be improved, and heat can be uniformly transferred to the evaporating agent 22, thereby avoiding the reduction in the overall cooling efficiency caused by the uneven distribution of heat on the heat-conducting part 23.

[0059] In an embodiment of the utility model, the heat-conducting fins 24 are circular, semicircular, rectangular, square or polygonal.

[0060] In the above technical solution, the heat-conducting fins 24 with different shapes can adapt to heat-conducting parts 23 with different structures, so that the heat-conducting fins 24 always have a large contact area with the evaporating agent 22, thereby ensuring that the heat-conducting part 23 has good heat-conducting effect.

[0061] In an embodiment of the utility model, the heat-dissipating structure further comprises a heat-dissipating part 33, the heat-dissipating part 33 is arranged on the cover plate 31, and the condensation cavity 32 is arranged in the heat-dissipating part 33.

[0062] In the technical scheme, the heat dissipation part 33 is used for containing the gaseous evaporant and dissipating heat of the gaseous evaporant to the external environment, so that the gaseous evaporant is cooled and condensed to recover the liquid state; the cover plate 31 is arranged on the top plate 13 as a carrier cover of the condensation cavity 32, and plays a sealing role on the cooling cavity 4 formed by the condensation cavity 32 and the evaporation cavity 21, thereby reducing leakage of the evaporant 22 in the cooling cavity 4, slowing down the decline speed of the cooling performance, and prolonging the duration of the cooling effect.

[0063] In one embodiment of the utility model, the heat dissipation part 33 is further provided with a heat dissipation fin 34, and the condensation cavity 32 is arranged in the heat dissipation fin 34.

[0064] In the technical scheme, the heat dissipation fin 34 can significantly increase the heat dissipation contact area of the heat dissipation part 33 with the external air, and improve the heat dissipation efficiency of the heat dissipation part 33; compared with the scheme that the condensation cavity 32 is arranged in the heat dissipation part 33, arranging the condensation cavity 32 in the heat dissipation fin 34 significantly increases the contact area of the gaseous evaporant 22 and the inner wall of the condensation cavity 32, and the condensation cavity 32 can directly guide the heat released in the condensation process to the heat dissipation fin 34, further improving the condensation efficiency of the condensation cavity 32 on the gaseous evaporant 22.

[0065] In one embodiment of the utility model, the cooling part 2 is in heat conduction contact with the temperature peak region of the battery cell 11.

[0066] In the technical scheme, the battery cell 11 may generate more heat in the charging and discharging process, especially in the high-load or rapid charging and discharging process, and form a temperature peak region, such as a specific region in the middle of the battery cell. Directly contacting the cooling part 2 with the temperature peak region can quickly absorb and export the concentrated heat energy, prevent the battery cell 11 from being locally overheated, thereby prolonging the service life of the battery cell 11 and improving the safety of the battery.

[0067] In one embodiment of the utility model, the cooling part 2 includes a first side wall 25 and a second side wall 26, the area of the first side wall 25 is smaller than the area of the second side wall 26, and the second side wall 26 is a polygon or a U-shaped.

[0068] In the technical scheme, the first side wall 25 and the second side wall 26 jointly form the cooling part 2, and the second side wall 26 can be arranged in different shapes, such as a polygon or a U-shaped, according to different temperature peak regions. The U-shaped second side wall 26 can also make the condensed evaporant 22 flow and gather at the bottom of the cooling part 2, so as to ensure the cooling effect of the battery cell region close to the bottom of the U-shaped second side wall 26 even in the case of less liquid evaporant 22.

[0069] In one embodiment of the utility model, cooling part 2 adopts copper or aluminum or other material with high thermal conductivity coefficient, and the excellent heat conduction performance of copper or aluminum can further improve the heat conduction efficiency of cooling part 2, thereby improving the cooling effect of battery cell 11.

[0070] In one embodiment of the utility model, the outer wall of cooling part 2 is coated with a heat-conducting coating.

[0071] In the above technical solution, the small gap between the outer wall of cooling part 2 and battery cell 11 can be filled by coating a coating such as heat-conducting silicone grease or graphite on the outer wall of cooling part 2, and the heat conduction performance of the interface can be improved, thereby reducing the thermal resistance and improving the heat transfer efficiency.

[0072] In one embodiment of the utility model, the box body includes a bottom plate 12, a side plate 14 and a top plate 13, the side plate 14 is arranged on the bottom plate 12, the top plate 13 is arranged on the side plate 14, and the cooling part 2 is arranged on the inner side of the top plate 13.

[0073] In the above technical solution, the bottom plate 12, the side plate 14 and the top plate 13 jointly constitute the box body 1, and the cooling part 2 is arranged on the inner side of the top plate 13 and is closer to the battery cell 11, which can improve the cooling efficiency of the battery cell 11, and arranging the cooling part 2 on the inner side of the top plate 13 can utilize the space in the box body 1 as much as possible, improve the space utilization rate, and significantly reduce the battery volume compared with the scheme of arranging the cooling part 2 outside the box body 1.

[0074] In one embodiment of the utility model, the cooling part 2 is detachably connected with the top plate 13. The cooling part 2 is detachably arranged on the inner side of the top plate 13 by means of screws, bolts, clamping or adhesion, which reduces the processing and installation difficulty of the cooling part 2 and the top plate 13, and facilitates the maintenance and replacement of the cooling part 2. When a single cooling part 2 is damaged or leaks, the cooling part 2 only needs to be removed and replaced, without the need to replace the whole, thereby reducing the maintenance cost.

[0075] In one embodiment of the utility model, the cooling part 2 is integrally formed with the top plate 13. The integrally formed cooling part 2 and top plate 13 can be obtained by die casting, injection molding or milling processing, and the integrally formed cooling part 2 and top plate 13 can improve the sealing performance of the cooling cavity 4, avoid the formation of a joint between the cooling part 2 and the top plate 13, and thereby reduce the leakage probability of the evaporating agent 22.

[0076] In one embodiment of the utility model, the evaporation cavity 21 and the condensation cavity 32 are communicated to form the cooling cavity 4, and the cooling cavity 4 is a sealed cavity.

[0077] In the above technical solution, by arranging the cooling cavity 4 as a sealed cavity, the leakage of the evaporating agent 22 in the cooling cavity 4 can be reduced, thereby slowing down the decline rate of the cooling performance and prolonging the duration of the cooling effect.

[0078] In one embodiment of the utility model, the top of the box 1 is provided with a sealing member, such as a sealing rubber ring, which seals the connection between the evaporation cavity 21 and the condensation cavity 32.

[0079] In the above technical solution, the sealing rubber ring and other sealing members are arranged around the hole of the top plate 13 to fill the gap around the through hole, further improving the sealing performance of the cooling cavity 4 and reducing the leakage of the evaporant 22 due to the gap between the cover plate 31 and the top plate 13.

[0080] In one embodiment of the utility model, the battery temperature less than or equal to 35℃ is the best working temperature range of the battery, the battery temperature greater than 35℃ is the over-temperature temperature range of the battery, the evaporant 22 is in liquid state in the best working temperature range of the battery, and the evaporant 22 is evaporated into gaseous state in the over-temperature temperature range of the battery.

[0081] In the above technical solution, when the battery is in the best working temperature range, the evaporant 22 does not need to evaporate to cool the battery, so the evaporant 22 remains in liquid state, on the one hand ensuring that the battery is in the best working state, and on the other hand saving the evaporant 22 and reducing the leakage amount of gaseous evaporant 22 leaking to the outside from the gap; when the battery temperature continues to rise and reaches the over-temperature temperature range, the evaporant 22 starts to evaporate from liquid state to gaseous state, absorbs heat during the evaporation process to cool the battery, and makes the battery able to be controlled and kept in the best working temperature range, thereby ensuring the stable performance of the battery and prolonging the service life of the battery.

[0082] From the above description, it can be seen that the above-mentioned embodiments of the utility model realize the following technical effects: the box body 1 is mainly used for packaging the battery module, and the battery 11 and the cooling part 2 inside the box body 1 are fixed and protected. The cooling part 2 is used for cooling the battery 11, the evaporation cavity 21 is arranged inside the cooling part 2, the evaporating agent 22 is filled in the evaporation cavity 21, the high temperature generated by the battery 11 is conducted to the evaporation cavity 21, so that the evaporating agent 22 in the evaporation cavity 21 changes from liquid state to gaseous state, thereby absorbing heat to realize the cooling of the battery 11. The heat conduction part 23 is used for conducting the heat of the inner wall of the evaporation cavity 21 to the evaporating agent 22, the heat exchange area is further increased by arranging the heat conduction part 23, the heat distribution is more uniform, and therefore the efficiency of the evaporative cooling is improved. The cover plate 31 is used for closing the box body 1 on one hand, and the condensation cavity 32 is integrated on the cover plate 31 on the other hand, and the condensation cavity 32 provides the space for the gaseous evaporating agent 22 to condense into liquid. The evaporation cavity 21 and the condensation cavity 32 are communicated, the evaporating agent 22 that absorbs heat in the evaporation cavity 21 and evaporates into gaseous state rises to the condensation cavity 32, because the temperature at the condensation cavity 32 is lower, the gaseous evaporating agent 22 releases heat and liquefies in the condensation cavity 32, and then drops to the evaporation cavity 21 again. The battery module provided by the utility model greatly reduces the complexity of the heat dissipation system by arranging the cooling part 2 and the heat dissipation structure, thereby solving the problems of complex structure and large space occupation of the existing battery module heat dissipation system.

[0083] Obviously, the above-described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor should belong to the protection scope of the utility model.

[0084] It should be noted that the terms used herein are only intended to describe specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, work, device, component and / or their combination.

[0085] The above only describes the preferred embodiments of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. An electric cell module, characterized by comprising: The application relates to a battery cooling device, which comprises a box body (1), a cooling part (2) and a battery cell (11), wherein the cooling part (2) and the battery cell (11) are arranged in the box body (1), the cooling part (2) is connected to the top of the box body (1), an evaporation cavity (21) is arranged in the cooling part (2), a heat conduction part (23) is arranged in the evaporation cavity (21), an evaporating agent (22) is filled in the evaporation cavity (21), and a cover plate (31) is arranged on the top of the box body (1), wherein the cover plate (31) is provided with a condensation cavity (32), and the evaporation cavity (21) is communicated with the condensation cavity (32).

2. The battery cell module of claim 1, wherein, The ratio of the width of the condensation cavity (32) to the width of the evaporation cavity (21) is 1:5-1:2; and / or the ratio of the height of the evaporation cavity (21) to the height of the battery cell (11) is 1:2-2:

3.

3. The battery cell module of claim 1, wherein, The ratio of the vertical sectional area of the condensation cavity (32) to the vertical sectional area of the evaporation cavity (21) is 1:3-2:

5.

4. The battery cell module of claim 3, wherein, The battery cell (11) is multiple, and the cooling part (2) is arranged between two adjacent battery cells (11).

5. The battery cell module of claim 4, wherein, The heat conduction part (23) is immersed in the evaporating agent (22), and the heat conduction part (23) is in contact with the side wall and the bottom wall of the evaporation cavity (21).

6. The battery cell module of claim 1, wherein, The heat conduction part (23) is provided with heat conduction fins (24), and the heat conduction fins (24) are arranged on the side of the heat conduction part (23) away from the side wall or the bottom wall of the evaporation cavity (21).

7. The battery cell module of claim 5, wherein, The ratio of the height of the heat conduction part (23) immersed in the evaporating agent (22) to the liquid level of the evaporating agent (22) is 1:4-2:

3.

8. The battery cell module of claim 1, wherein, The heat conduction part (23) has a capillary structure; and / or the heat conduction fins (24) arranged on the heat conduction part (23) have a capillary structure.

9. The battery cell module of claim 6, wherein, The heat conduction fins (24) are arranged on the heat conduction part (23) in a spaced manner; and / or the heat conduction fins (24) are circular, semicircular, rectangular, square or polygonal.

10. The battery cell module of claim 1, wherein, The heat dissipation structure further comprises a heat dissipation part (33) arranged on the cover plate (31), and the condensation cavity (32) is arranged in the heat dissipation part (33); and / or the heat dissipation part (33) is further provided with heat dissipation fins (34), and the condensation cavity (32) is arranged in the heat dissipation fins (34).

11. The battery cell module of claim 1, wherein, The cooling part (2) is in heat conduction contact with the temperature peak area of the battery cell (11); and / or the cooling part (2) comprises a first side wall (25) and a second side wall (26), the area of the first side wall (25) is smaller than that of the second side wall (26), and the second side wall (26) is polygonal or U-shaped.

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