Immersed liquid-cooled battery box

Abstract

The utility model provides an immersed liquid-cooled battery box which comprises a box body, a lithium battery module is arranged in the box body, the box body is sealed and divided into a large cabin body and a small cabin body, the lithium battery module immersed by cooling immersion liquid is arranged in the large cabin body, a liquid injection system is connected outside the large cabin body, and a matched plug connector required by integration of the lithium battery module is arranged in the small cabin body. A sight glass is arranged on the outer side of the box body, and the upper end and the lower end of the sight glass communicate with the large cabin through pipelines correspondingly. The energy storage box has the advantages that the heat exchange capacity of the energy storage box is greatly improved, the sealed and isolated box body structure is convenient to operate and overhaul, cooling immersion liquid can be filled in real time, and liquid level observation is provided.

Description

Technical Field

[0001] The utility model relates to the technical field of battery cooling, in particular to an immersion type liquid cooling battery box. Background Art

[0002] Energy storage systems collect electricity to achieve peak load shaving and improve the quality of electricity. Battery energy storage technology is currently a storage technology with good application prospects and rapid development, and occupies a mainstream position in the electrochemical energy storage market. Generally speaking, the greater the power, the greater the charge and discharge rate required for the battery, and the greater the heat generated; in certain high-power applications, such as energy storage frequency modulation, in order to adapt to high-power applications, it is necessary to increase the battery capacity to reduce the charge and discharge rate, thereby increasing the battery cost; in addition, when the battery thermal runaway, a large amount of heat is generated instantly. At this time, if the cooling system does not have time to cool the battery, it will cause the risk of fire and explosion; how to improve the heat dissipation effect of the battery is the key to solving these problems.

[0003] At present, battery energy storage systems are generally cooled in two ways: first, the ambient temperature is controlled by air cooling technology, which has the disadvantages of low heat dissipation efficiency and slow temperature change rate when the ambient temperature is adjusted by air; second, liquid cooling uses coolant circulation to dissipate heat, which requires the layout of liquid cooling pipes, takes up a lot of space, and the system is complex and expensive. In addition, air cooling and water cooling do not perform well in terms of temperature uniformity. There is also a cooling method on the market that directly immerses the battery module in a battery box filled with coolant. This cooling method can quickly cool the surface of the battery module by replacing the coolant in the battery box, and has high cooling efficiency and flame retardancy. However, in actual applications, considering the convenience of inspection and maintenance, it is necessary to solve the problems of filling and discharging the coolant in the battery box, sealing the connectors in the battery box, and observing the liquid level through the battery box structure design. Summary of the invention

[0004] The utility model aims to solve the problems of slow temperature change, low cooling efficiency and poor temperature uniformity of an immersion liquid-cooled battery box in existing cooling methods.

[0005] In order to achieve the above object, the utility model is implemented through the following technical solutions:

[0006] An immersion liquid-cooled battery box comprises a box body, a lithium battery module is built in the box body, the box body is sealed and divided into a large cabin body and a small cabin body, the large cabin body has a lithium battery module immersed in cooling immersion liquid, the large cabin body is externally connected to a liquid injection system, the small cabin body has a matching connector required for integrating the lithium battery module, and a sight glass is provided on the outside of the box body, and the upper and lower ends of the sight glass are connected to the large cabin body through pipelines respectively.

[0007] Furthermore, the large cabin and the small cabin are sealed and isolated by a partition.

[0008] Furthermore, a liquid cooling plate is installed at the bottom of the box, and a thermal pad is provided between the lithium battery module and the liquid cooling plate.

[0009] Furthermore, the box body and the large cabin body form an outer liner and an inner liner respectively, the small cabin body is the area inside the outer liner and outside the inner liner, and the large cabin body serving as the inner liner is welded to the bottom of the box body.

[0010] Furthermore, a liquid cooling plate is installed at the bottom of the box body, and a thermal pad is provided between the large cabin body serving as the inner liner and the liquid cooling plate.

[0011] Furthermore, the injection system includes a quick connector and a pipeline. The quick connector is arranged at a fixed embedded opening on the outside of the large cabin body. One end of the pipeline is connected to the quick connector, and the other end extends into the large cabin body.

[0012] Furthermore, the sight glass is a cylindrical transparent tube, and a scale is provided on the sight glass.

[0013] Compared with the prior art, the utility model has the following advantages:

[0014] The utility model discloses an immersion-type liquid-cooled battery box, which places a lithium battery module in a cooling immersion liquid, so that the battery cell and the cooling immersion liquid can directly exchange heat, greatly improving the heat exchange capacity of the energy storage box, thereby effectively reducing the vertical temperature difference of the battery cell and the temperature difference between the battery cells, and effectively extending the battery life; in order to achieve the above-mentioned effect, the utility model proposes a sealed and isolated box structure, which is convenient for operation and maintenance, can be filled with cooling immersion liquid in real time, and provides liquid level observation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structural decomposition of Example 1 of the utility model.

[0016] Figure 2 It is a schematic diagram of the structural decomposition of Example 2 of the utility model.

[0017] Figure 3 It is a cross-sectional schematic diagram of the utility model.

[0018] Figure 4 It is a schematic diagram of the operation panel of the utility model.

[0019] Figure numerals: 1. large cabin; 2. small cabin; 3. operation panel; 4. partition; 5. liquid cooling plate; 6. quick connector; 7. pipeline; 8. embedded port; 9. sight glass. DETAILED DESCRIPTION

[0020] The embodiments of the present utility model are described in further detail below in conjunction with the accompanying drawings. Example

[0021] An immersion liquid-cooled battery box includes a box body, a lithium battery module is built in the box body, and the box body is sealed and divided into a large cabin body 1 and a small cabin body 2. The large cabin body 1 has a lithium battery module immersed in cooling immersion liquid, the large cabin body 1 is connected to an external liquid injection system, and the small cabin body 2 has a built-in matching connector required for the integration of the lithium battery module. An operation panel 3, such as a BMS panel, is arranged outside the box body, and a matching connector (such as a BMU panel) in the small cabin body 2 is connected to the operation panel 3 at one end, and connected to the lithium battery module in the large cabin body 1 at the other end.

[0022] like Figure 1 As shown, the large cabin 1 and the small cabin 2 are sealed and isolated by a partition 4, and the partition 4 is welded to the bottom of the box to ensure that the operation panel 3 and the matching connectors will not directly contact the cooling immersion liquid or the volatile liquid of the cooling immersion liquid, which is convenient for maintenance.

[0023] A liquid cooling plate 5 is installed at the bottom of the box body, and a thermal pad is provided between the lithium battery module and the liquid cooling plate 5, so that the battery core can effectively conduct heat with the liquid cooling plate 5 through the thermal pad.

[0024] like Figure 3 As shown, the injection system includes a quick connector 6 and a pipeline 7. The quick connector 6 is arranged at an embedded opening 8 fixed on the outside of the large cabin body 1. The quick connector 6 adopts a manual ball valve or a quick pneumatic connector. One end of the pipeline 7 is connected to the quick connector 6, and the other end extends into the large cabin body 1. The pipeline 7 is made of insulating, heat-resistant and flame-retardant materials.

[0025] Furthermore, if Figure 4 As shown, the operation panel 3 has an opening for the quick connector 6 to communicate with the external liquid injection pipeline. The operation panel 3 is provided with a sight glass 9, which is a cylindrical transparent tube with a scale. The upper and lower ends of the sight glass 9 are respectively connected to the large cabin 1 through pipelines; the liquid level of the cooling immersion liquid in the large cabin 1 can be reflected on the sight glass 9 in real time.

[0026] The lithium battery module in the utility model directly exchanges heat through the cooling immersion liquid, and then exchanges heat indirectly through the liquid cooling plate 5, which greatly improves the heat exchange capacity of the energy storage box. The lithium battery module can be immersed in different liquid levels or completely immersed. The cooling immersion liquid can be an insulating liquid such as fluorinated liquid, synthetic oil or silicone oil. Example

[0027] On the basis of Example 1, Figure 2As shown, the box body and the large cabin body 1 form an outer liner and an inner liner respectively, the small cabin body 2 is the area inside the outer liner and outside the inner liner, and the large cabin body 1 as the inner liner is in a cylindrical shape with upper and lower openings and is welded to the bottom of the box body. A liquid cooling plate 5 is installed at the bottom of the box body, and a thermal pad is provided between the large cabin body 1 as the inner liner and the liquid cooling plate 5. Preferably, the box body as the outer liner is made of a metal thin plate, and the large cabin body 1 as the inner liner is made of copper or aluminum with good thermal conductivity. The rest is the same as in Example 1.

[0028] The above is only a preferred embodiment of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the concept of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An immersion liquid-cooled battery box, comprising a box body, a lithium battery module built in the box body, characterized in that: The box is sealed and divided into a large cabin and a small cabin. The large cabin houses a lithium battery module immersed in cooling immersion liquid. The large cabin is connected to a liquid injection system. The small cabin houses matching connectors required for integrating the lithium battery module. A sight glass is provided on the outside of the box. The upper and lower ends of the sight glass are connected to the large cabin through pipelines.

2. The submerged liquid-cooled battery box according to claim 1, characterized in that: The large cabin and the small cabin are sealed and isolated by a partition.

3. The submerged liquid-cooled battery box according to claim 2, characterized in that: A liquid cooling plate is installed at the bottom of the box, and a thermal pad is provided between the lithium battery module and the liquid cooling plate.

4. The submerged liquid-cooled battery box according to claim 1, characterized in that: The box body and the large cabin body form an outer liner and an inner liner respectively, the small cabin body is the area inside the outer liner and outside the inner liner, and the large cabin body serving as the inner liner is welded to the bottom of the box body.

5. The submerged liquid-cooled battery box according to claim 4, characterized in that: A liquid cooling plate is installed at the bottom of the box body, and a heat conductive pad is arranged between the large cabin body serving as the inner liner and the liquid cooling plate.

6. An immersion liquid-cooled battery box according to claim 4 or 5, characterized in that: The liquid injection system comprises a quick connector and a pipeline. The quick connector is arranged at a fixed embedded opening outside the large cabin body. One end of the pipeline is connected to the quick connector, and the other end extends into the large cabin body.

7. The submerged liquid-cooled battery box according to claim 6, characterized in that: The sight glass is a cylindrical transparent tube with scales arranged on it.

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