Liquid-cooled battery pack applied to energy storage system

Abstract

The utility model discloses a liquid-cooled battery pack applied to an energy storage system, which comprises a liquid-cooled plate, a plurality of water flow channels are arranged in the liquid-cooled plate, a plurality of battery modules are connected onto the liquid-cooled plate, two ends of each battery module are respectively connected with an end plate, and the battery modules and the end plates are limited together through a sleeve frame to form a whole. The end plate is fixed on the liquid cooling plate, the battery module is connected with the CCS plate, the liquid cooling plate is fixedly provided with the load plug-in panel, the load plug-in panel is connected with the upper cover, and the upper cover is fixed on the liquid cooling plate. The water flow channel is arranged in the liquid cooling plate, so that heat in the battery pack is taken away, and the temperature in the battery pack is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a liquid cooling battery pack applied to energy storage system belongs to energy storage battery and power battery technical field. BACKGROUND

[0002] With the rapid development of renewable energy and the continuous expansion of the energy storage industry market, efficient and safe energy storage system becomes the key. As the core component of the energy storage system, the performance of the battery pack directly affects the efficiency and safety of the whole system. Moreover, with the increase of the capacity of the battery cell from 280Ah to 314Ah, and the continuous increase of the capacity of the battery cell released by the battery cell enterprise, such as 500+Ah and 600+Ah, the capacity of the battery pack and even the container is increasing. In this process, how to accommodate more battery cells in the limited space of the battery pack to increase the capacity of the battery pack is a problem that needs to be solved in the current technology.

[0003] At the same time, the traditional air cooling cooling method has been difficult to meet the cooling demand of high energy density battery pack. If the temperature is too high, thermal runaway may occur, causing serious safety hazards. The liquid cooling cooling method gradually becomes the mainstream cooling method of high energy density battery pack due to its excellent cooling effect and stability.

[0004] In summary, the defects and deficiencies of the current technology are as follows:

[0005] 1. The capacity of the current battery pack is too small to meet the market demand, and a battery pack with larger capacity is needed.

[0006] 2. The traditional air cooling cooling design may not meet the cooling demand of large battery cell battery pack. The high temperature in the battery pack may cause the performance of the battery to decrease, the service life to be shortened, and even safety problems, so a more efficient cooling scheme is needed. SUMMARY

[0007] The technical problem to be solved by the utility model is how to improve the capacity of the battery pack and how to improve the cooling efficiency in the battery pack.

[0008] In order to solve the above technical problems, the technical scheme of the utility model provides a liquid cooling battery pack applied to energy storage system, characterized in that it comprises a liquid cooling plate, a plurality of water flow channels are arranged in the liquid cooling plate, a plurality of battery modules are connected to the liquid cooling plate, two ends of each battery module are connected with an end plate respectively, the battery module and the end plate are limited together through a sleeve frame to form an integral whole, the end plate is fixed on the liquid cooling plate, a CCS (Compact Cooling System) plate is connected to the battery module, a load plug-in panel is fixed on the liquid cooling plate, the load plug-in panel is connected with an upper cover, and the upper cover is fixed on the liquid cooling plate.

[0009] Preferably, the battery module comprises a plurality of battery cells directly stacked on the liquid cooling plate.

[0010] Preferably, any two adjacent battery cells are connected by a layer of thermal insulation material.

[0011] Preferably, the layer of thermal insulation material is an aerogel layer or a mica foam layer.

[0012] Preferably, the frame comprises four long screws and four fastening strips arranged around the battery module and the end plate, forming two square frames arranged vertically and limiting the battery module and the end plate together.

[0013] Preferably, each end plate is provided with two fastening strips on the side opposite to the side where the battery module is located, and the battery module is provided with two long screws on each side adjacent to the side of the end plate, each fastening strip is connected to one end of two long screws, and each long screw is connected to one end of two fastening strips; the two long screws and the two fastening strips on the opposite side of the battery module form a square frame.

[0014] Preferably, the plurality of battery modules are arranged at front and rear positions on the liquid cooling plate, and the long screws of the battery module at the rear position on the liquid cooling plate are arranged in the opposite direction to the long screws of the battery module at the front position on the liquid cooling plate.

[0015] Preferably, the end plate is fixed to the liquid cooling plate by short screws, and the end plate is provided with at least two holes, and the short screws are fixedly connected to the liquid cooling plate through the holes in the end plate.

[0016] Preferably, the liquid cooling plate comprises a liquid cooling plate body, beams are arranged around the liquid cooling plate body, a water flow channel is arranged on the liquid cooling plate body, and the beams are connected to the end plate.

[0017] Preferably, the liquid cooling plate is a sunken lower box structure, and a flange is extended around the upper cover, and the upper cover is fixed to the liquid cooling plate by the flange extended around the upper cover.

[0018] Compared with the prior art, the liquid-cooled battery pack has at least one of the following advantages:

[0019] 1. The liquid cooling plate is provided with a water flow channel inside, which carries away the heat inside the battery pack and reduces the temperature inside the battery pack.

[0020] 2. The heat transfer between the battery cells is reduced by placing thermal insulation material between the battery cells.

[0021] 3. The battery module is fixed by screws, instead of traditional steel straps and plastic straps, the fixing method is more convenient, the space inside the battery pack is saved, and the length of the battery module can be adjusted conveniently by screwing the screws.

[0022] 4. The crossbeams around the liquid cooling plate can strengthen the battery pack during hoisting and prevent it from falling off during the hoisting process, thus avoiding safety accidents. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a liquid-cooled battery pack used in an energy storage system. Detailed Implementation

[0024] To make this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0025] This invention provides a liquid-cooled battery pack for use in energy storage systems, such as... Figure 1 As shown, it comprises key components such as a liquid cooling plate 2, a load insert panel 1, battery modules 5, a CCS board 8, and a top cover 7. The liquid cooling plate 2 adopts a sunken lower box structure design, with rivet screws installed on the four crossbeams 10. The liquid cooling plate 2 has water flow channels inside to remove heat from the battery pack and reduce the internal temperature. Multiple battery modules 5 are placed on the liquid cooling plate 2. Aerogel or mica foam is pasted between the cells of the battery modules 5 and their large surfaces (the largest surface area of ​​the cell, both front and back) and sides for heat insulation, reducing heat transfer between cells. At the same time, the battery modules 5 can be directly stacked on the liquid cooling plate 2, reducing the time required for squeezing and hoisting the cells into the box after stacking.

[0026] Multiple battery modules 5 are positioned at the front and rear of the liquid cooling plate 2. After the front battery modules 5 are stacked, four long screws 4 are used to fix the two end plates 9 at both ends of the battery modules 5 to the battery modules 5 through four fastening strips 3. Finally, the position of the battery modules 5 is fixed by using short screws 6 through the holes in the end plates 9 to fix the battery modules 5 to the crossbar 11 of the liquid cooling plate 2. The crossbar 11 is welded to the bottom of the upper surface of the liquid cooling plate 2 and has multiple threaded holes. The threaded end of the short screw 6 passes through the hole in the end plate 9 and is fastened to the corresponding threaded hole on the crossbar 11.

[0027] The four long screws 4 and four fastening strips 3 form two rectangular frames that bind the battery module 5 and the end plate 9 together and are arranged vertically. Each end plate 9 has two fastening strips 3 on the side opposite to the side where the battery module 5 is located. The battery module 5 has two long screws 4 on each side adjacent to the side connected to the end plate 9. Each fastening strip 3 is connected to one end of the two long screws 4 at both ends, and each long screw 4 is connected to one end of the two fastening strips 3 at both ends. The two long screws 4 and the two fastening strips 3 on the opposite side of the battery module 5 form a rectangular frame.

[0028] The rear battery module 5 is also stacked and fixed in the same way, but the long screw rod 4 of the rear battery module 5 on the liquid cooling plate 2 is placed in the opposite direction of the long screw rod 4 of the front battery module 5 on the liquid cooling plate 2. This fixing method not only makes it more convenient to fix, but also saves space in the battery pack, improves the space utilization rate of the battery pack, and the long screw rod 4 is fastened by a nut, which can appropriately adjust the length of the battery module 5 according to the situation, leaving more sufficient space for the expansion of the battery cell. Then the CCS plate 8 is welded on the battery module 5, and the load plug-in panel 1 is first fixed on the liquid cooling plate 2 through the support 12 (wherein the support 12 is welded on the upper surface of the liquid cooling plate 2), and then the small through holes on the four sides of the load plug-in panel 1 are fixed and connected together with the small threaded holes on the periphery of the first hole 14 on the front panel of the upper cover 7 through screws, and the upper cover 7 is fixed on the four surrounding beams 10 of the liquid cooling plate 2 through the flange edges extending outwards, and the sealing surface is not less than 9mm. Finally, the maintenance plate 13 is fixed on the front panel of the upper cover 7 and covers the second hole 15. Among them, the maintenance plate 13 is provided with a plurality of small through holes around, and the front panel of the upper cover 7 is provided with a plurality of small threaded holes around the second hole 15, and the small through holes of the maintenance plate 13 are fastened and connected with the small threaded holes on the front panel of the upper cover 7 around the second hole 15 through screws.

Claims

1. A liquid-cooled battery pack for use in an energy storage system, comprising: The application relates to a battery module, which comprises a liquid cooling plate (2) internally provided with a plurality of water flow channels, a plurality of battery modules (5) connected to the liquid cooling plate (2), an end plate (9) connected to each end of each battery module (5), a CCS plate (8) connected to the battery module (5), a load plug-in panel (1) fixed to the liquid cooling plate (2), and an upper cover (7) fixed to the liquid cooling plate (2).

2. A liquid-cooled battery pack for use in an energy storage system as claimed in claim 1, wherein, The battery module (5) comprises a plurality of battery cells directly stacked on the liquid cooling plate (2).

3. A liquid-cooled battery pack for use in an energy storage system as claimed in claim 2, wherein, Any two adjacent battery cells are connected by a heat insulation material layer.

4. A liquid-cooled battery pack for use in an energy storage system as claimed in claim 3, wherein, The heat insulation material layer is an aerogel layer or a mica bubble cotton layer.

5. A liquid-cooled battery pack for use in an energy storage system as claimed in claim 1, wherein, The sleeve frame comprises four long screws (4) and four fastening strips (3) arranged around the battery module (5) and the end plate (9), forming two square frames arranged in an up-down mode and limiting the battery module (5) and the end plate (9) together.

6. A liquid-cooled battery pack for use in an energy storage system as claimed in claim 5, wherein, The end plate (9) is fixed to the liquid cooling plate (2) by a short screw (6); the end plate (9) is provided with at least two holes, and the short screw (6) is fixedly connected to the liquid cooling plate (2) by penetrating the holes on the end plate (9).

7. A liquid-cooled battery pack for use in an energy storage system as claimed in claim 5 or 6, wherein, The liquid cooling plate (2) comprises a liquid cooling plate body, the liquid cooling plate body is provided with a cross beam (10) around the liquid cooling plate body, the water flow channel is arranged on the liquid cooling plate body, and the cross beam (10) is connected to the end plate (9).

8. The liquid-cooled battery pack for use in an energy storage system of claim 1, wherein, The liquid cooling plate (2) is a sunken lower box structure; the upper cover (7) is extended with a flange edge around the upper cover (7), and the upper cover (7) is fixed to the liquid cooling plate (2) by the flange edge extended around the upper cover (7).

9. The liquid-cooled battery pack for use in an energy storage system of claim 1, wherein, ​ 10. The liquid-cooled battery pack for use in an energy storage system of claim 1, wherein, ​

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