Battery with air-cooling and liquid-cooling combined heat dissipation system

Abstract

The utility model belongs to the field of batteries, and particularly relates to a battery with an air cooling and liquid cooling combined heat dissipation system, which comprises a battery box, a liquid cooling plate, a plurality of battery cell modules and a liquid cooling fin side plate, the liquid cooling plate, the plurality of battery cell modules and the liquid cooling fin side plate are arranged in the battery box, a flow guide structure is arranged above the liquid cooling fin side plate, the liquid cooling plate is arranged on the lower surfaces of the battery cell modules, and the flow guide structure is arranged above the liquid cooling fin side plate. The liquid cooling fin side plates are arranged on the side surfaces of the battery cell modules, and the flow guide structures are used for driving airflow between the liquid cooling fin side plates to move. Through the combined action of the liquid cooling plate, the liquid cooling side plate and the flow guide structure, the heat dissipation efficiency of the battery cell module is improved, the temperature uniformity of the battery cell module in the height direction is ensured, the overall heat dissipation capability of the battery cells is enhanced, the temperature uniformity between the single battery cells is ensured, and the service life of the battery cell module is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and particularly relates to a battery with an air-cooling and liquid-cooling combined heat dissipation system. Background Art

[0002] At present, one of the major problems faced by new energy vehicles is to solve the endurance problem, and the heat dissipation of the battery cells is a crucial link.

[0003] Currently, for the lithium battery cells installed in the battery box, the heat dissipation methods are mainly divided into air cooling and liquid cooling, and the heat dissipation effect of liquid cooling is much better than that of air cooling. Currently, liquid cooling is mainly achieved in two ways: one is to install multiple cold water pipes in the battery box to surround the battery for installation. Electrical components such as relays need to be placed in the battery box later, resulting in a complex structure, inconvenient installation and later maintenance, and there is also a hidden danger of water leakage damaging the battery cells; the other is to adopt the method of liquid cooling at the bottom of the battery cells, such as installing a liquid cooling plate under the battery cells, or the bottom plate of the battery box is provided with a water channel to dissipate heat from the battery cells through flowing water. The advantage of this method is that the internal structure of the battery box is simple, and it is convenient to install and replace the battery; the disadvantage is that there are different degrees of temperature differences between the bottom and the top of the battery cells, resulting in a short service life of the battery cells.

[0004] In view of this, the present utility model is specifically proposed. Content of the Utility Model

[0005] In order to solve the technical problems existing in the prior art, the present utility model provides a battery pack with an air-cooling and liquid-cooling combined heat dissipation system. Through the combined action of the liquid cooling plate, the liquid cooling side fin side plate and the flow guiding structure, the present utility model improves the heat dissipation efficiency of the battery cell module, ensures the temperature uniformity of the battery cell module in the height direction, enhances the overall heat dissipation capacity of the battery cells, ensures the temperature uniformity between the single battery cells, and improves the service life of the battery cell module.

[0006] The present utility model includes the following technical solutions:

[0007] The present utility model provides a battery with an air-cooling and liquid-cooling combined heat dissipation system, including a battery box and a liquid cooling plate, a plurality of battery cell modules and liquid cooling fin side plates arranged in the battery box. A flow guiding structure is arranged above the liquid cooling fin side plates. The liquid cooling plate is arranged on the lower surface of the battery cell module, and the liquid cooling fin side plates are arranged on the side surfaces of the battery cell module. The flow guiding structure is used to drive the air flow between the liquid cooling fin side plates to move.

[0008] Further, the liquid cooling fin side plate includes a liquid cooling side plate and a plurality of heat dissipation fins. One side of the liquid cooling side plate is fixedly connected to the battery cell module, and the other side is connected to a plurality of the heat dissipation fins. The plurality of heat dissipation fins are evenly spaced.

[0009] Further, the battery box includes a box body and a box cover, and both ends of the heat dissipation fins extend towards the box cover and the liquid cooling plate respectively.

[0010] Further, the interval between two adjacent heat dissipation fins is 3 - 10 mm.

[0011] Further, the liquid cooling fin side plates are arranged on both sides of the cell module with a larger area.

[0012] Further, the battery box includes a box body and a box cover, and the box cover includes a box cover base material and a flow guiding structure, and the box cover base material is welded to the flow guiding structure.

[0013] Further, a plurality of the flow guiding structures are arranged and are arranged close to the liquid cooling fin side plates.

[0014] Further, a flame retardant insulating material is coated on the outer surface of the liquid cooling plate.

[0015] Further, the liquid cooling plate is connected to the cell module through a thermal conductive adhesive.

[0016] Further, an air grille with an inclined opening is arranged on the upper side of the flow guiding structure, and the inclined opening faces the pole column.

[0017] Adopting the above technical solutions, the present utility model has the following advantages:

[0018] 1. Through the combined action of the liquid cooling plate, the liquid cooling fin side plates and the flow guiding structure, the present utility model improves the heat dissipation efficiency of the cell module, ensures the temperature uniformity of the cell module in the height direction, enhances the overall heat dissipation capacity of the cells, ensures the temperature uniformity between single cells, and improves the service life of the cell module.

[0019] 2. Compared with the traditional liquid cooling system, the present utility model adds fin air cooling, increases the heat exchange, improves the heat dissipation effect, and ensures the temperature uniformity of the cell module in the height direction.

[0020] 3. Compared with the traditional liquid cooling system, the present utility model improves the defects of too high cell height and large cell temperature difference in the traditional liquid cooling integrated box body, and can achieve better temperature control.

[0021] 4. Compared with the traditional liquid cooling system, this system can, to a certain extent, achieve not setting protective materials between cells, and only adopting the temperature control methods of air cooling and liquid cooling to prevent the cells from thermal runaway.

[0022] 5. For ternary cells, the flow guiding structure air grille can prevent the splashing of high-temperature particulate matter and prevent the risk of thermal runaway.

[0023] Other features and advantages of the present utility model will be described in the subsequent description, and in part, will be obvious from the description, or can be understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained by the structures pointed out in the description and the drawings. Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0025] Figure 1 It is a schematic diagram of the overall view of a battery with an air-cooling and liquid-cooling combined heat dissipation system in an embodiment of the present utility model;

[0026] Figure 2 It is a schematic diagram of the structure of the box cover in an embodiment of the present utility model;

[0027] Figure 3 It is a schematic diagram of the structure of the diversion structure in an embodiment of the present utility model;

[0028] Figure 4 It is an exploded view of a battery pack with an air-cooling and liquid-cooling combined heat dissipation system in an embodiment of the present utility model;

[0029] Figure 5 It is a schematic diagram of the position of the diversion structure and the liquid-cooling fin side plate in an embodiment of the present utility model;

[0030] Figure 6 It is a schematic diagram of the structure of the liquid-cooling fin side plate in an embodiment of the present utility model;

[0031] In the figure: 10 - battery box, 20 - liquid-cooling plate, 30 - electrical components, 40 - battery cell module, 50 - liquid-cooling fin side plate, 60 - box cover, 61 - box cover base material, 62 - diversion structure. Detailed Embodiments

[0032] The following description provides many different embodiments or examples for implementing different features of the present utility model. The elements and arrangements described in the following specific examples are only used to concisely express the present utility model, and they are only examples and are not intended to limit the present utility model.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0034] This embodiment provides a battery with an air-cooled and liquid-cooled combined heat dissipation system. As shown in Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 , it includes a battery box 10, a liquid-cooled plate 20, a plurality of battery cell modules 40, and a liquid-cooled fin side plate 50 disposed in the battery box 10. As shown in Figure 1 , the battery box 10 includes a box body and a box cover 60. The box cover 60 includes a box cover base material 61 and a flow guiding structure 62, and the box cover base material 61 is welded to the flow guiding structure 62. The liquid-cooled fin side plate 50 is disposed on the side surface of the battery cell module 40, the liquid-cooled plate 20 is disposed on the lower surface of the battery cell module 40, and the flow guiding structure 62 is disposed above the liquid-cooled fin side plate 50. The flow guiding structure 62 is used to drive the air flow between the liquid-cooled fin side plates 50 to move towards the box cover base material 61.

[0035] Among them, electrical components 30 are also disposed in the battery box 10.

[0036] As shown in Figure 2 , the liquid-cooled plate 20 of the present utility model is disposed at the bottom of the battery cell module 40 and is in direct contact with the battery cell module 40. Heat conduction is achieved through contact to realize heat dissipation. However, if only the liquid-cooled plate 20 is used, this will cause uneven temperature in the height direction of the battery cell module 40, which not only affects the use of the battery cell module 40 but also reduces the service life of the battery cell module 40. At the same time, a liquid-cooled fin side plate 50 is disposed on the side surface of the battery cell module 40, and a flow guiding structure 62 is disposed above the liquid-cooled fin side plate 50, which can drive the air flow to accelerate upward floating, drive the flow of the cold air (hereinafter referred to as cold air) cooled on the surfaces of the liquid-cooled plate 20 and the liquid-cooled fin side plate 50, enhance heat exchange, ensure the uniformity in the height direction of the battery cell module 40, enhance the overall heat dissipation ability of the battery cells, ensure the temperature uniformity among the individual battery cell modules 40, and improve the service life of the battery cell module 40.

[0037] It should be noted that the liquid cooling plate 20 can use existing mature products. During the use of the liquid cooling plate 20, coolant needs to be introduced, and the coolant can be a liquid such as ethylene glycol. When in use, both the liquid inlet and outlet of the liquid cooling plate 20 are connected to an external coolant tank, and the coolant is circulated in the liquid cooling plate 20 by the action of a pump.

[0038] Furthermore, as Figure 3 shown, the liquid cooling fin side plate 50 includes a liquid cooling side plate and a plurality of heat dissipation fins, and the plurality of heat dissipation fins are evenly spaced. The evenly spaced fins can ensure that the fins can uniformly exchange heat with the rising cold air, having the advantage of improving the heat exchange efficiency. During the use of the liquid cooling fin side plate 50, coolant needs to be introduced, and the coolant can be a liquid such as ethylene glycol. When in use, it can be used in parallel with the liquid inlet and outlet of the liquid cooling plate 20.

[0039] Furthermore, as Figure 3 shown, both ends of the heat dissipation fin extend towards the lid 60 and the liquid cooling plate 20 respectively. Since the cold air flows from one end of the liquid cooling plate 20 towards the lid 60 end, an air flow channel for cold air can be formed between the heat dissipation fins arranged in this way, which not only increases the contact area between the heat dissipation fins on the liquid cooling fin plate and the cold air, but also improves the flow rate of the cold air, having the advantage of improving the heat exchange efficiency.

[0040] Furthermore, the interval between two adjacent heat dissipation fins is 3 - 10 mm. Preferably 3 mm. By designing the distance between two adjacent heat dissipation fins, the utilization rate of cold air can be improved, waste can be avoided, and the cost can be reduced.

[0041] Furthermore, the heat dissipation fin is 1 mm wide, 4 mm long, and has the same height as the liquid cooling side plate. Such a structure has a better heat dissipation effect.

[0042] Furthermore, a plurality of the flow guiding structures 62 are provided, and are respectively arranged above the liquid cooling fin side plates 50 of the battery cell module 40. Specifically, as Figure 5 shown, in the figure, the liquid cooling fin side plates 50 are arranged on both sides of the battery cell module 40, and corresponding to these two sides, the flow guiding structures 62 are arranged on the upper surfaces of the liquid cooling fin side plates 50. This can ensure that the cold air accelerated by the fan drives acts on the heat dissipation fins, having the advantage of improving the heat dissipation effect.

[0043] The cold air driven by the flow guiding structure 62 enters the inclined air grille of the flow guiding structure 62, enters the pole column side, and cools the pole column.

[0044] Furthermore, an air grille with an inclined opening is provided on the upper side of the flow guiding structure 62, and the inclined opening faces the pole column; the flow guiding structure 62 is on both sides of the explosion-proof valve of the battery cell module 40, and the air grille with the inclined opening is provided to prevent high-temperature particulate matter from splashing and causing thermal diffusion after thermal runaway of the battery cell module 40; at the same time, the flow guiding structure 62 drives the cold air to enter the inclined opening air grille of the flow guiding structure 62 and then enter the side of the pole column to cool the pole column.

[0045] Furthermore, a flame-retardant insulating material is coated on the outer surface of the liquid cooling plate 20. It has the advantages of avoiding insulation and flame-retardant failure.

[0046] Furthermore, the liquid cooling plate 20 is connected to the battery cell module 40 through a thermal conductive adhesive. Connecting the battery cell module 40 and the liquid cooling plate 20 through the thermal conductive adhesive can reduce the contact thermal resistance and has the advantage of improving the heat dissipation efficiency.

[0047] Among them, the lower surface of the liquid cooling plate 20 is connected to the bottom of the box body, and the upper surface is connected to the battery cell module 40. Its connection with the box body can be fixedly connected by bolts, or the outer edge of the liquid cooling plate 20 can be set to be adapted to the inner wall surface of the box body to position and limit the liquid cooling plate 20.

[0048] Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A battery with an air-cooling and liquid-cooling combined heat dissipation system, characterized in that, It includes a battery box (10), a liquid cooling plate (20), a plurality of battery cell modules (40) and a liquid cooling fin side plate (50) arranged in the battery box (10). A flow guiding structure (62) is arranged above the liquid cooling fin side plate (50). The liquid cooling plate (20) is arranged on the lower surface of the battery cell module (40), and the liquid cooling fin side plate (50) is arranged on the side surface of the battery cell module (40). The flow guiding structure (62) is used to drive the air flow between the liquid cooling fin side plates (50) to move.

2. The battery with an air-cooling and liquid-cooling combined heat dissipation system according to claim 1, wherein, The liquid cooling fin side plate (50) includes a liquid cooling side plate and a plurality of heat dissipation fins. One side of the liquid cooling side plate is fixedly connected to the battery cell module (40), and the other side is connected to the plurality of heat dissipation fins. The plurality of heat dissipation fins are arranged at uniform intervals.

3. The battery with an air-cooling and liquid-cooling combined heat dissipation system according to claim 2, wherein The battery box (10) includes a box body and a box cover (60). The two ends of the heat dissipation fin extend towards the box cover (60) and the liquid cooling plate (20) respectively.

4. The battery with an air-cooling and liquid-cooling combined heat dissipation system according to claim 3, wherein The interval between two adjacent heat dissipation fins is 3-10 mm.

5. A battery having an air-cooled and liquid-cooled combined heat dissipation system according to any one of claims 1-4, characterized in that, The liquid cooling fin side plates (50) are arranged on both side surfaces of the battery cell module (40) with larger areas.

6. The battery with an air-cooling and liquid-cooling combined heat dissipation system according to claim 5, characterized in that, The battery box (10) includes a box body and a box cover (60). The box cover (60) includes a box cover base material (61) and a flow guiding structure (62). The box cover base material (61) is welded to the flow guiding structure (62).

7. A battery having an air-cooled and liquid-cooled combined heat dissipation system according to claim 6, wherein, A plurality of the flow guiding structures (62) are arranged and are arranged close to the liquid cooling fin side plate (50).

8. A battery having an air-cooled and liquid-cooled combined heat dissipation system according to claim 1, characterized in that, A flame-retardant insulating material is coated on the outer surface of the liquid cooling plate (20).

9. A battery having an air-cooled and liquid-cooled combined heat dissipation system according to claim 1 or 8, characterized in that The liquid cooling plate (20) is connected to the battery cell module (40) through a thermal conductive adhesive.

10. A battery with an air-cooling and liquid-cooling combined heat dissipation system according to claim 1, characterized in that An air grille with an inclined opening is arranged on the upper side of the flow guiding structure (62), and the inclined opening faces the pole column.

Images