Shell for oil-immersed battery pack and oil-immersed battery pack

Abstract

The utility model provides a shell for an oil immersed battery pack, which is characterized in that a lower guide plate is arranged at the inner bottom of a box body, two ends of the lower guide plate are tightly fixed at two ends of the box body, the lower guide plate is communicated with an oil inlet of the box body, more than one battery pack mounting shell is arranged at the top of the lower guide plate side by side and is fixed in the box body, and the lower guide plate is communicated with the oil inlet of the box body. The upper guide plate is fixed on the top of the more than one battery pack mounting shell, the open end of the upper guide plate is close to the inner side surface of one end of the box body where the oil outlet is located, the open end of the upper guide plate is communicated with the oil outlet of the box body, and the box body and the cover plate are matched and sealed together. The utility model also provides an oil immersion type battery pack manufactured by using the shell provided by the utility model. The shell disclosed by the utility model is simple in structure, convenient to install and better in heat dissipation performance, and the battery pack manufactured by the shell is more regular in oil circulating flow direction, and can quickly and effectively reduce the temperature difference among battery packs in the battery pack.

Description

Technical Field

[0001] The utility model relates to a housing for an oil-immersed battery pack and an oil-immersed battery pack. Background Art

[0002] At present, the application fields of battery packs are becoming wider and wider. In order to meet the requirements of various fields, there are more and more types of battery packs, such as air-cooled battery packs, liquid-cooled battery packs, oil-immersed battery packs, etc. However, no matter which type, it is necessary to solve the heat dissipation problem of the batteries in the battery pack. Only by ensuring good heat dissipation and ensuring a low temperature difference between the battery groups in the battery pack can the service performance and safety performance of the battery pack be better guaranteed. Therefore, how to design a housing for a battery pack with better heat dissipation has become a major research topic at present. Summary of the Utility Model

[0003] The utility model aims to provide a housing for an oil-immersed battery pack, which has a simple structure, is easy to install, has good heat dissipation, and can reduce the temperature difference between the battery groups in the battery pack. At the same time, a battery pack manufactured by using the housing for the oil-immersed battery pack of the utility model is also provided.

[0004] The utility model is realized through the following solutions:

[0005] A housing for an oil-immersed battery pack, comprising a box body, a cover plate, more than one battery pack mounting housing, a lower flow guide plate and an upper flow guide plate. The battery pack mounting housing is a frame structure with both the top and bottom open. On the top and bottom of the battery pack mounting housing, there are respectively several baffles that are parallel to each other and spaced apart by a certain distance. The baffles on the top of the battery pack mounting housing are spatially parallel to the baffles on the bottom, that is, the placement directions of the baffles on the top and bottom of the battery pack mounting housing are the same. The lower flow guide plate is an inverted U-shaped through groove structure, and the top of the lower flow guide plate is provided with several oil inlet through holes. The upper flow guide plate is a U-shaped groove structure with one end closed and one end open, and the bottom of the upper flow guide plate is provided with several oil outlet through holes. An oil outlet, a positive terminal port and a negative terminal port are opened at a position above one end face of the box body, and an oil inlet is opened at a position below one end face of the box body. The lower flow guide plate is arranged on the inner bottom of the box body, and both ends of the lower flow guide plate are tightly fixed to both ends of the box body. The lower flow guide plate is communicated with the oil inlet of the box body. More than one battery pack mounting housing is placed side by side on the top of the lower flow guide plate and fixed in the box body. The upper flow guide plate is fixed on the top of more than one battery pack mounting housing, and the open end of the upper flow guide plate is closely attached to the inner side of the end where the oil outlet of the box body is located. The open end of the upper flow guide plate is communicated with the oil outlet of the box body. The box body and the cover plate are enclosed together in a matching manner. The number, setting position, size and shape of the oil inlet through holes on the lower flow guide plate can be adjusted and designed according to needs. The setting position of the oil inlet through holes is such that the oil inlet through holes are directly opposite to the gaps between adjacent battery packs, so that the oil can smoothly flow through the gaps between the battery packs after entering through the oil inlet through holes of the lower flow guide plate, thereby smoothly taking away the heat generated by each battery pack, reducing the temperature of each battery pack, and reducing the temperature difference between each battery pack. The number, setting position, size and shape of the oil outlet through holes on the upper flow guide plate can be adjusted and designed according to needs. The number of the baffles on the top and bottom of the battery pack mounting housing and the distance between the baffles can be adjusted and designed according to needs.

[0006] Further, at the bottom of the open end of the upper flow guide plate, there is a downwardly protruding oil collecting groove with an open outer end and flush with the end of the open end of the upper flow guide plate. The oil collecting groove is communicated with the oil outlet of the box body. The setting of the oil collecting groove can reduce the liquid outlet pressure of the upper flow guide plate.

[0007] Further, notches are respectively provided at the closed end and the top of both sides of the upper flow guide plate. The number, shape, size and setting position of the notches can be adjusted and designed according to needs.

[0008] Further, at a position near the end of one or both ends of the top of the lower flow guide plate, there is an upwardly protruding buffer groove. The setting of the buffer groove can reduce the liquid inlet pressure of the lower flow guide plate.

[0009] An oil-immersed battery pack includes a shell and several battery packs. The shell uses the shell for the oil-immersed battery pack described above. The several battery packs are evenly divided according to the number of battery pack mounting shells and are arranged side by side and in layers within each battery pack mounting shell. The gap between two adjacent battery packs faces the corresponding oil inlet holes on the lower guide plate. The several battery packs are interconnected. The positive and negative terminals of the several interconnected battery packs are correspondingly connected to the positive and negative terminals on the box. The box is filled with oil. The liquid level of the oil is higher than the plane where the tops of the several interconnected battery packs are located and lower than the plane where the bottoms of the upper guide plate are located. In actual production, the connection method between the battery packs can be a single series or parallel connection, or a combination of series and parallel connections. The specific connection method can be adjusted and designed as needed.

[0010] The shell for the oil-immersed battery pack of the present invention has a simple structure, is easy to install, and has good heat dissipation. The oil-immersed battery pack made by using the shell for the oil-immersed battery pack of the present invention, the oil in the oil tank enters the lower guide plate from the oil inlet of the box body after passing through the cooling device, then enters from the oil inlet through the lower guide plate and flows through each battery pack from bottom to top through the gap between each two adjacent battery packs, finally the oil rises and gathers in the upper guide plate, enters the oil outlet of the box body through the oil collecting groove of the upper guide plate, and flows back to the oil tank from the oil outlet of the box body, thus completing a circulation flow of the oil, and the circulation flow direction of the oil in the oil-immersed battery pack is relatively regular, which can quickly and effectively reduce the temperature difference between the battery packs in the battery pack, thereby ensuring the performance and safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the overall structure of the housing (excluding the cover plate) for the oil-immersed battery pack in Example 1;

[0012] Figure 2 This is a schematic diagram of the structure of the battery pack installation shell in Example 1;

[0013] Figure 3 Schematic diagram of the structure of the lower guide plate in Example 1;

[0014] Figure 4 This is a schematic structural diagram of the upper guide plate in Example 1. DETAILED DESCRIPTION

[0015] The embodiments are only intended to illustrate one implementation of the present invention and are not intended to limit the scope of protection of the present invention.

[0016] Example 1

[0017] A shell for an oil-immersed battery pack, such as Figure 1As shown, it includes a box body 1, a cover plate ( Figure 1 the cover plate is not shown in Figure 1 ), two battery pack mounting shells 3, a lower flow guide plate 4 and an upper flow guide plate 2. As Figure 2 shown in Figure 2 , the battery pack mounting shell 3 is a frame structure with both the top and bottom open. On the top and bottom of the battery pack mounting shell, there are respectively provided a number of baffles 31 that are parallel to each other and spaced apart by a certain distance. The baffles 31 on the top of the battery pack mounting shell 3 are spatially parallel to the baffles 31 on the bottom, that is, the placement directions of the baffles 31 on the top and bottom of the battery pack mounting shell 3 are the same. As Figure 3 shown in Figure 3 ( Figure 3 the lower flow guide plate in Figure 3 is in an inverted placement state), the lower flow guide plate 4 is an inverted U-shaped through groove structure. The bottom of the lower flow guide plate 4 is provided with a number of oil inlet through holes 41. At a position near the end of one end of the top of the lower flow guide plate 4, there is a buffer groove 42 protruding upwards. As Figure 4 shown in Figure 4 , the upper flow guide plate 2 is a U-shaped groove structure with one end closed and one end open. The bottom of the upper flow guide plate 2 is provided with a number of oil outlet through holes 21. At the bottom of the open end of the upper flow guide plate 2, there is a oil collecting groove 22 protruding downwards with the outer end open and flush with the end of the open end of the upper flow guide plate. At the closed end and the tops of both sides of the upper flow guide plate 2, there are respectively provided notches 23. On the upper position of one end face of the box body 1, there are provided an oil outlet 11, a positive terminal port 12 and a negative terminal port 13. On the lower position of one end face of the box body 1, there is provided an oil inlet 14. The lower flow guide plate 4 is arranged on the inner bottom of the box body 1 and both ends of the lower flow guide plate 4 are tightly fixed to both ends of the box body 1. The lower flow guide plate 4 is communicated with the oil inlet 14 of the box body 1. Two battery pack mounting shells 3 are placed side by side on the top of the lower flow guide plate 4 and fixed in the box body 1. The upper flow guide plate 2 is fixed on the top of the two battery pack mounting shells 3 and the open end of the upper flow guide plate 2 is tightly against the inner side of the end where the oil outlet 11 of the box body 1 is located. The oil collecting groove 21 of the upper flow guide plate 2, that is, the open end, is communicated with the oil outlet 11 of the box body 1. The box body 1 and the cover plate are enclosed together in a matching manner.

[0018] Embodiment 2

[0019] A housing for an oil-immersed battery pack, its structure is similar to that of the housing for an oil-immersed battery pack in Embodiment 1. The difference is that: the number of battery pack mounting shells is one, and at the positions near the ends of both ends of the top of the lower flow guide plate, there are buffer grooves protruding downwards.

[0020] Embodiment 3

[0021] A housing for an oil-immersed battery pack, its structure is similar to that of the housing for an oil-immersed battery pack in Embodiment 1. The difference is that: the number of battery pack mounting shells is three.

[0022] Embodiment 4

[0023] An oil-immersed battery pack includes a housing and several groups of battery packs. The housing uses the housing for the oil-immersed battery pack in Embodiment 1. The several groups of battery packs are evenly divided according to the number of battery-pack installation housings and are respectively arranged side by side and in layers in each battery-pack installation housing. The gap between two adjacent groups of battery packs is opposite to the corresponding oil inlet through holes on the lower flow guide plate. The several groups of battery packs are connected together. In this embodiment, the several groups of battery packs in the same battery-pack installation housing are first connected in parallel for the battery packs in the same row and then connected in series for the upper and lower battery packs. Then, the battery packs connected in the two battery-pack installation housings are connected in series with each other. The positive terminal and negative terminal of the several groups of battery packs connected together are correspondingly connected to the positive port and negative port on the box body. The box body is filled with oil, and the liquid level of the oil is higher than the plane where the tops of the several groups of battery packs connected together are located and lower than the plane where the bottom of the upper flow guide plate is located.

[0024] During use, the oil inlet of the oil tank is connected to the oil outlet of the box body, the oil outlet of the oil tank is connected to the oil inlet of the cooling device, and the oil outlet of the cooling device is connected to the oil inlet of the box body. Then, the oil can circulate. Specifically, the oil in the oil tank enters the lower flow guide plate from the oil inlet of the box body after passing through the cooling device, then enters from the oil inlet through holes of the lower flow guide plate and flows through each battery pack from bottom to top through the gap between two adjacent groups of battery packs. Finally, the oil rises and converges into the box body through the oil collecting groove of the upper flow guide plate and returns to the oil tank from the oil outlet of the box body, thus completing one cycle of oil circulation. The circulation direction of the oil in the oil-immersed battery pack is relatively regular, which can quickly and effectively reduce the temperature difference between the battery packs in the battery pack and ensure the service performance and safety performance of the battery pack.

Claims

1. A housing for an oil-immersed battery pack, characterized in that: It includes a box body, a cover plate, more than one battery pack installation housing, a lower flow guide plate and an upper flow guide plate. The battery pack installation housing is a frame structure with both the top and bottom open. On the top and bottom of the battery pack installation housing, there are respectively several baffles that are parallel to each other and spaced apart by a certain distance. The baffles on the top of the battery pack installation housing are spatially parallel to the baffles on the bottom. The lower flow guide plate is an inverted U-shaped through groove structure, and there are several oil inlet through holes provided on the top of the lower flow guide plate. The upper flow guide plate is a U-shaped groove structure with one end closed and one end open, and there are several oil outlet through holes provided on the bottom of the upper flow guide plate. An oil outlet, a positive terminal port and a negative terminal port are provided at a position near the upper part of one end face of the box body, and an oil inlet is provided at a position near the lower part of one end face of the box body. The lower flow guide plate is arranged on the inner bottom of the box body, and both ends of the lower flow guide plate are tightly fixed on both ends of the box body. The lower flow guide plate is communicated with the oil inlet of the box body. More than one battery pack installation housing is placed side by side on the top of the lower flow guide plate and fixed in the box body. The upper flow guide plate is fixed on the top of more than one battery pack installation housing, and the open end of the upper flow guide plate is tightly against the inner side of the end where the oil outlet of the box body is located. The open end of the upper flow guide plate is communicated with the oil outlet of the box body. The box body and the cover plate are closed together in a matching manner.

2. The housing for an oil-immersed battery pack according to claim 1, wherein: At the bottom of the open end of the upper flow guide plate, there is a downwardly protruding oil collecting groove with an open outer end and flush with the end of the open end of the upper flow guide plate. The oil collecting groove is communicated with the oil outlet of the box body.

3. The housing for an oil-immersed battery pack according to claim 2, characterized in that: Notches are respectively provided at the closed end and the top of both sides of the upper flow guide plate.

4. The housing for an oil-immersed battery pack according to any one of claims 1 to 3, characterized in that: At a position near the end of one or both ends of the top of the lower flow guide plate, there is an upwardly protruding buffer groove.

5. An oil-immersed battery pack, comprising a housing and a plurality of battery groups, characterized in that: The housing uses the housing for an oil-immersed battery pack as described in any one of claims 1 to 4. Several groups of battery packs are evenly divided according to the number of battery pack installation housings and are respectively arranged side by side and in layers in each battery pack installation housing. The gaps between adjacent two groups of battery packs are aligned with the corresponding oil inlet through holes on the lower flow guide plate. Several groups of battery packs are connected to each other. The positive terminal total end and the negative terminal total end of several groups of battery packs connected to each other are correspondingly connected to the positive terminal port and the negative terminal port on the box body. The box body is filled with oil. The liquid level of the oil is higher than the plane where the tops of several groups of battery packs connected to each other are located and lower than the plane where the bottom of the upper flow guide plate is located.

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