Integrated battery pack based on integration of capillary network and liquid cooling plate

Abstract

The utility model belongs to the field of batteries, and particularly relates to an integrated battery pack based on integration of a capillary network and a liquid cooling plate, which comprises a battery box, and the liquid cooling plate, a battery cell module and the capillary network which are arranged in the battery box, the liquid cooling plate and the capillary network are arranged at the two ends of the battery cell module in the height direction of the battery cell module respectively, the liquid cooling plate is located below the battery cell module and connected with the battery cell module, and the capillary network is located above the battery cell module and is spaced from the battery cell module by a preset distance; wherein the height direction of the battery cell module is the height direction when the battery cell module is used. According to the utility model, the capillary network is arranged in the height direction and is matched with the liquid cooling plate to cool the battery cell module, so that the uniformity of the temperature of the battery cell is ensured, and the service life of the battery cell is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and particularly relates to an integrated battery pack based on the integration of a capillary network and a liquid cooling plate. 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 key link.

[0003] Currently, for the lithium battery cells loaded in the battery box, the heat dissipation methods are mainly divided into air cooling and water cooling, and the heat dissipation effect of water cooling is much better than that of air cooling; currently, water 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 subsequent maintenance, and there is also a hidden danger of water leakage damaging the battery cells; the other is to adopt the method of water cooling at the bottom of the battery cells, such as installing a liquid cooling plate under the battery cells, or there is a water channel on the bottom plate of the battery box body, and the battery cells are cooled by 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, reducing the service life of the battery cells.

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

[0005] In order to solve the technical problems existing in the prior art, the present utility model proposes an integrated battery pack based on the integration of a capillary network and a liquid cooling plate. The present utility model realizes the cooling of the battery cell module by setting a capillary network and a liquid cooling plate in cooperation in the height direction, ensures the uniformity of the battery cell temperature, and improves the service life of the battery cells.

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

[0007] The present utility model provides an integrated battery pack based on the integration of a capillary network and a liquid cooling plate, including a battery box and a liquid cooling plate, a battery cell module and a capillary network arranged in the battery box. The liquid cooling plate and the capillary network are respectively arranged at both ends of the battery cell module along the height direction of the battery cell module, and the liquid cooling plate is located below the battery cell module and connected to the battery cell module, and the capillary network is located above the battery cell module and spaced from the battery cell module by a preset distance;

[0008] Wherein, the height direction of the battery cell module is the height direction when the battery cell module is in use.

[0009] Further, the preset distance is 6 - 24 mm.

[0010] Further, the capillary network is made of a polymer material.

[0011] Further, the polymer material is polypropylene.

[0012] Further, a heat preservation structure is also arranged in the battery box, and the heat preservation structure is arranged between the inner wall surface of the battery box and the capillary network.

[0013] Further, a bottom guard plate of the capillary network is also arranged in the battery box, and the bottom guard plate of the capillary network is arranged between the battery cell module and the capillary network, and the bottom guard plate of the capillary network is closely attached to the capillary network.

[0014] Further, the liquid cooling plate is fixedly connected with the battery cell module through a heat-conducting adhesive.

[0015] Further, the material of the liquid cooling plate is aluminum alloy.

[0016] Further, a flame-retardant insulating material is coated on the outer surface of the liquid cooling plate.

[0017] Further, the battery box includes a box body and a box cover, and the box body is detachably connected with the box cover.

[0018] Adopting the above technical solution, the present utility model has the following advantages:

[0019] The present utility model realizes the cooling of the battery cell module by the cooperation of arranging the capillary network and the liquid cooling plate in the height direction, ensures the uniformity of the battery cell temperature, and improves the service life of the battery cell.

[0020] Other features and advantages of the present utility model will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present utility model. The objectives and other advantages of the present utility model can be realized and obtained by the structures pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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 the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0022] Figure 1 It is a schematic structural diagram of an integrated battery pack based on the integration of a capillary network and a liquid cooling plate in an embodiment of the present utility model;

[0023] Figure 2 It is an exploded structural diagram of an integrated battery pack based on the integration of a capillary network and a liquid cooling plate in an embodiment of the present utility model;

[0024] In the figure: 10 - battery box, 11 - box body, 12 - box cover, 20 - liquid cooling plate, 30 - battery cell module, 40 - capillary network bottom protection plate, 50 - capillary network, 60 - thermal insulation structure. Detailed implementation manners

[0025] The following description provides many different embodiments or examples for implementing different features of the present utility model. The components and arrangements described in the following specific examples are only used to concisely express the present utility model, which is only used as an example and is not intended to limit the present utility model.

[0026] 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. Obviously, 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.

[0027] This embodiment provides an integrated battery pack based on the integration of a capillary network and a liquid cooling plate. As Figure 1 、 Figure 2 shown, it includes a battery box 10 and a liquid cooling plate 20, a battery cell module 30, a capillary network 50, and a thermal insulation structure 60 disposed in the battery box 10. As Figure 2 shown, the liquid cooling plate 20 and the capillary network 50 are respectively disposed at both ends of the battery cell module 30 along the height direction of the battery cell module 30, and the liquid cooling plate 20 is located below the battery cell module 30 and connected to the battery cell module 30, and the capillary network 50 is located above the battery cell module 30 and spaced from the battery cell module 30 by a preset distance;

[0028] wherein, the height direction of the battery cell module 30 is the height direction when the battery cell module 30 is in use. As Figure 2 shown, the position of the illustrated battery is the position when in use, and the arrow direction in the illustration is the height direction.

[0029] As Figure 2 shown, the liquid cooling plate 20 of the present utility model is disposed at the bottom of the battery cell module 30 and is in direct contact with the battery cell module 30, and heat conduction is achieved through contact to realize heat dissipation. However, if only the liquid cooling plate 20 is used, this will cause uneven temperature in the height direction of the battery cell module 30, which not only affects the use of the battery cell module 30, but also reduces the service life of the battery cell module 30; while a capillary network 50 is disposed above the battery cell module 30, and the capillary network 50 dissipates heat from the battery cell module 30 by radiation, ensuring the uniformity in the height direction of the battery cell module 30 and improving the service life of the battery cell module 30.

[0030] Further, as Figure 1 , Figure 2 shown, the battery box 10 includes a box body 11 and a box cover 12, and the box body 11 is detachably connected to the box cover 12. This facilitates the disassembly and replacement of the structure inside the battery box 10.

[0031] Since the liquid cooling plate 20 is in direct contact with the battery cell module 30 for heat dissipation, there will be a temperature gradient during the heat dissipation process of the battery cell module 30 as the heat accumulated during heat dissipation is dissipated through the bottom. For the battery cells with the pole columns facing upwards, the capillary network 50 is arranged at a preset distance from the battery cell module 30, and it can dissipate heat from the top of the battery cell module 30 through thermal radiation, reducing the temperature difference in the height direction of the battery cells, and having the advantages of improving the heat dissipation efficiency of the entire battery pack and the service life of the battery cell module 30.

[0032] It should be noted that both the liquid cooling plate 20 and the capillary network 50 can use existing mature products. During use, coolant needs to be introduced into both the liquid cooling plate 20 and the capillary network 50, and the coolant can be a liquid such as ethylene glycol. When in use, the liquid inlets and outlets of the liquid cooling plate 20 and the capillary network 50 are connected to different external water tanks, and the water in the water tank enters the liquid cooling plate 20 and the capillary network 50 through the action of a pump.

[0033] Further, the preset distance is 6 - 24 mm, preferably 12 mm. By restricting this distance, the size of the battery pack can be reduced while ensuring good radiative heat dissipation.

[0034] Further, the capillary network 50 uses 5°C condensed water.

[0035] Since the capillary network 50 is arranged above the battery cell assembly, and the positive and negative electrodes of the battery cell assembly are also located above the battery cell assembly, in order to avoid short - circuit of the battery cell assembly, further, the capillary network 50 is made of a polymer material.

[0036] Further, the polymer material is polypropylene.

[0037] Further, as Figure 1 , Figure 2 shown, a heat - insulating structure 60 is further arranged inside the battery box 10, and the heat - insulating structure 60 is arranged between the inner wall surface of the battery box 10 and the capillary network 50. The heat - insulating structure 60 can be a heat - insulating board made of heat - insulating material with a layer of aluminum foil attached. By arranging the heat - insulating structure 60, it can prevent the capillary network 50 from radiating and convecting heat in the direction away from the battery cell module 30, improve the utilization rate of the cold quantity of the capillary network 50, improve the heat - dissipation efficiency, and reduce the complexity of the liquid - cooling plate pipeline.

[0038] Further, as Figure 1, Figure 2 As shown, a capillary network bottom guard plate 40 is further provided in the battery box 10. The capillary network bottom guard plate 40 is disposed between the battery cell module 30 and the capillary network 50, and is in close contact with the capillary network 50, playing a supporting role for the capillary network 50.

[0039] The upper surface of the heat preservation structure 60 therein may be fixedly connected to the box cover 12. The heat preservation structure 60, the capillary network 50 and the capillary network bottom guard plate 40 may be fixedly connected or detachably connected; if the capillary network 50 is not connected to the heat preservation structure 60, the capillary network 50 may be fixed on the upper surface of the capillary network bottom guard plate 40. The capillary network bottom guard plate 40 and the side beam of the box cover 12 may be connected by welding or detachably connected.

[0040] Furthermore, the liquid cooling plate 20 is fixedly connected to the battery cell module 30 through a heat-conducting adhesive. Connecting the battery cell module 30 and the liquid cooling plate 20 through a heat-conducting adhesive can reduce the contact thermal resistance, having the advantages of improving the heat dissipation efficiency and avoiding uneven heat dissipation.

[0041] Wherein, the lower surface of the liquid cooling plate 20 is connected to the bottom of the box body 11, and the upper surface is connected to the battery cell module 30. Its connection with the box body 11 may be fixedly connected by bolts, or the outer edge of the liquid cooling plate 20 may be set to be adapted to the inner wall surface of the box body 11 to position and limit the liquid cooling plate 20.

[0042] Furthermore, the material of the liquid cooling plate 20 is aluminum alloy. This material has good thermal conductivity and has the advantage of improving the heat dissipation effect.

[0043] Furthermore, the outer surface of the liquid cooling plate 20 is coated with a flame-retardant insulating material. Avoiding the failure of insulation and flame retardancy and improving the safety of the battery.

[0044] 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 recorded in the foregoing embodiments, or perform equivalent replacements on 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. An integrated battery pack based on the integration of capillary tube networks and liquid cooling plates, characterized in that, It includes a battery box (10), a liquid cooling plate (20), a battery cell module (30) and a capillary network (50) arranged in the battery box (10). The liquid cooling plate (20) and the capillary network (50) are respectively arranged at both ends of the battery cell module (30) along the height direction of the battery cell module (30). The liquid cooling plate (20) is located below the battery cell module (30) and is connected to the battery cell module (30), and the capillary network (50) is located above the battery cell module (30) and is spaced from the battery cell module (30) by a preset distance; Among them, the height direction of the battery cell module (30) is the height direction when the battery cell module (30) is in use.

2. The integrated battery pack based on the integration of capillary network and liquid cooling plate according to claim 1, wherein The preset distance is 6 - 24 mm.

3. The integrated battery pack based on the integration of capillary network and liquid cooling plate according to claim 1 or 2, characterized in that, The capillary network (50) is made of a polymer material.

4. The integrated battery pack based on the integration of capillary network and liquid cooling plate according to claim 3, wherein, The polymer material is polypropylene.

5. The integrated battery pack based on the integration of capillary network and liquid cooling plate according to claim 1, wherein, A heat preservation structure (60) is further arranged in the battery box (10), and the heat preservation structure (60) is arranged between the inner wall surface of the battery box (10) and the capillary network (50).

6. The integrated battery pack based on the integration of capillary network and liquid cooling plate according to claim 1, characterized in that, A capillary network bottom protection plate (40) is further arranged in the battery box (10), and the capillary network bottom protection plate (40) is arranged between the battery cell module (30) and the capillary network (50), and the capillary network bottom protection plate (40) is in close contact with the capillary network (50).

7. An integrated battery pack based on the integration of capillary tube networks and liquid cooling plates according to claim 1, wherein The liquid cooling plate (20) is fixedly connected to the battery cell module (30) through a heat-conducting adhesive.

8. The integrated battery pack based on the integration of capillary network and liquid cooling plate according to claim 1 or 6, characterized in that, The material of the liquid cooling plate (20) is aluminum alloy.

9. An integrated battery pack based on the integration of a capillary network and a liquid cooling plate according to claim 1 or 6, characterized in that The outer surface of the liquid cooling plate (20) is coated with a flame-retardant insulating material.

10. An integrated battery pack based on the integration of a capillary network and a liquid cooling plate according to claim 1, characterized in that, The battery box (10) includes a box body (11) and a box cover (12), and the box body (11) is detachably connected to the box cover (12).

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