CN209029506U - A liquid immersion cooled automotive power battery pack - Google Patents

Abstract

The utility model relates to a liquid immersion cooling type automobile power battery pack, which comprises a casing with an upper end opening, a cover body sealingly connected with the upper end opening of the casing, and a connection terminal for connecting with an external circuit. A hollow chamber is arranged in the body, a battery pack, an insulating cooling liquid and a pump are arranged in the casing, the connection terminals are electrically connected with the battery pack, and the insulating cooling liquid fills the inner space of the casing, so the The pump is connected to the hollow chamber of the cover body through a pipeline, and the lower surface of the cover body is provided with a liquid outlet for communicating the interior of the casing and the hollow chamber. The utility model provides a liquid immersion cooling type automobile power battery pack, which realizes the cooling of the automobile power battery pack by immersing the battery pack in the insulating cooling liquid as a whole.

Description

A liquid immersion cooled automotive power battery pack

technical field

The utility model relates to the field of power batteries, in particular to a liquid immersion cooling type automobile power battery pack.

Background technique

With the increasingly severe energy and environmental problems, electric vehicles are gradually replacing traditional fuel vehicles and become an important branch of the automotive industry. Electric vehicles include three core technologies, power battery, motor and control system, among which power battery is the most critical, and its performance index and economic cost determine the commercialization process of electric vehicles. At present, electric vehicle batteries are mainly divided into two categories-batteries and fuel cells, while batteries, including nickel-metal hydride batteries, lithium batteries, and sodium-sulfur batteries, are the focus of current market development.

The power battery will heat up during the charging process and the discharging process. The charging process is an exothermic reaction and has internal resistance of the battery. During the fast charging process, the temperature of the battery will rise significantly, especially when it is almost fully charged. During the process, the heat of the battery is mainly caused by the Joule heat caused by the internal resistance of the battery; the long-term high temperature of the battery will have a negative impact on the life of the battery, and may even overheat and spontaneously ignite, so these batteries need to control their internal temperature within a reasonable range. Power battery charging requires fast charging speed. The simplest and most rude solution is to increase the charging current. High current will cause increased heat generation. During the discharge process, to ensure sufficient power of the vehicle, a large current output is also required, resulting in the rapid generation of Joule heat. The above working conditions cause the heating rate of the power battery to be much higher than that of the conventional battery, so the power battery needs to be equipped with a heat sink to ensure the safety of the power system. At present, with the increasing demand for battery capacity, the traditional fan cooling can no longer meet the cooling needs of the power battery, and the non-contact liquid cold plate cooling structure is complicated and the cost is high.

Utility model content

The utility model provides a liquid immersion cooling type automobile power battery pack, which can cool the automobile power battery pack by immersing the battery pack in an insulating cooling liquid as a whole. The structure directly contacts the insulating cooling liquid with the battery pack. , the heat dissipation speed of the battery pack is improved, and the demand for rapid heat dissipation of the battery pack can be met. At the same time, the structure is simple, which is beneficial to reduce the manufacturing cost.

In order to achieve the above purpose, the utility model provides a liquid immersion cooling type automotive power battery pack, which includes a casing with an upper end opening, a cover body sealingly connected to the upper end opening of the casing, and a cover for connecting with an external circuit. A connection terminal, a hollow chamber is arranged in the cover, a battery pack, an insulating cooling liquid and a pump are arranged in the casing, the connection terminal is electrically connected with the battery pack, and the insulating cooling liquid is filled with the casing The pump is connected to the hollow chamber of the cover body through a pipeline, and the lower surface of the cover body is provided with a liquid outlet for communicating the interior of the casing and the hollow chamber.

As a preferred solution, the casing is also provided with a flow-equalizing suction pipe, the inlet of the pump is connected to the flow-equalizing suction pipe, and the flow-equalizing suction pipe is a tubular structure with both ends closed and hollow and is horizontal Set on the side of the battery pack, the outer wall of the flow-equalizing pipette is provided with a plurality of liquid inlet holes arranged at equal intervals along the length direction of the flow-equalizing pipette, and the battery pack includes multiple rows along the For the battery cells arranged in the length direction of the flow equalization pipette, a cooling channel for the insulating cooling liquid to flow can be formed between any two adjacent rows of the battery cells. The plurality of liquid inlet holes are respectively arranged in alignment with the plurality of the cooling channels formed by the plurality of rows of the battery cells.

As a preferred solution, a plurality of heat dissipation fins are connected to the upper surface of the cover body.

As a preferred solution, a cooling fan is provided on the outer side of the cooling fins.

As a preferred solution, a plurality of the heat dissipation fins are provided on the side surface of the casing.

As a preferred solution, the liquid immersion cooling type automotive power battery pack further includes an air-cooled radiator, the pipe includes a heat-dissipating section, and the heat-dissipating section is a coiled tubular structure, and the heat-dissipating section is connected to the air-cooled radiator. connected and located within the air-cooled radiator.

As a preferred solution, the casing is provided with a liquid inlet, the liquid outlet end of the pipeline is connected to the liquid inlet, and the pump and the liquid inlet are located on two sides of the battery pack, respectively.

As a preferred solution, a backup pump is also provided in the casing, and the backup pump is connected to the liquid inlet end of the pipeline.

As a preferred solution, the battery pack includes a plurality of single cells respectively connected to the bottom surface of the casing and arranged in a rectangular array.

As a preferred solution, a plurality of brackets for supporting the unit cells are provided on the bottom surface of the casing.

A liquid immersion cooling type automotive power battery pack provided by the above technical solution uses the terminal as a power output terminal to supply power to the car, and a large amount of heat is generated during the charging and discharging process of the automotive power battery pack, wherein the heat source is the battery pack. The single battery inside, in order to reduce the heat of the single battery, is filled with insulating cooling liquid in the casing, so as to ensure that the battery pack is completely immersed in the insulating cooling liquid, and the insulating cooling liquid exchanges heat with the single battery in real time, thereby reducing the cost of the single battery. Since the insulating cooling liquid in the casing will be heated by the single battery while realizing the heat dissipation of the single battery, the insulating cooling liquid is pumped to the hollow chamber of the cover body by setting a pump, and is The heated insulating cooling liquid is cooled in the hollow chamber, and the cooled insulating cooling liquid is returned to the inside of the casing. This structure improves the heat dissipation rate of the battery pack by directly contacting the insulating cooling liquid with the battery pack, which can meet the The battery pack needs to quickly dissipate heat, and at the same time, the structure is simple, which is beneficial to reduce the manufacturing cost.

Description of drawings

Fig. 1 is the structural representation of Embodiment 1 of the present utility model;

Figure 2 is a schematic structural diagram of the interior of the housing;

FIG. 3 is a schematic structural diagram of Embodiment 2 of the present invention.

Among them: 1. Shell; 2. Cover; 3. Heat dissipation section; 4. Air-cooled radiator; 5. Pipe; 6. Pump; 7. Support; 8. Single battery; 9. Terminal; Flow suction pipe; 11. Cooling fins; 12. Cooling fan.

Detailed ways

The specific embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

Example 1

As shown in FIGS. 1-2 , a liquid immersion cooling type automotive power battery pack provided in this embodiment includes a casing 1 with an upper end opening, and a cover body 2 sealingly connected to the upper end opening of the casing 1 . and terminals for connecting with external circuits, the cover body 2 is provided with a hollow chamber, the casing 1 is provided with a battery pack, an insulating cooling liquid and a pump 6, and the wiring terminals are connected to the battery pack. Electrical connection, the insulating cooling liquid fills the inner space of the housing 1, the pump 6 is connected with the hollow chamber of the cover body 2 through the pipeline 5, and the lower surface of the cover body 2 is provided with a communication The interior of the housing 1 and the liquid outlet of the hollow chamber. Specifically, the connection terminal 9 is used as the power output terminal to supply power to the automobile. During the charging and discharging process of the automobile power battery pack, a large amount of heat will be generated. The heat source is the single cell 8 in the battery pack. The heat of the battery pack is filled with insulating cooling liquid in the casing 1, so as to ensure that the battery pack is completely immersed in the insulating cooling liquid, and the insulating cooling liquid exchanges heat with the single cells 8 in real time, thereby reducing the heat of the single cells 8. The insulating cooling liquid in the body 1 will be heated by the single cells 8 while realizing the heat dissipation of the single cells 8, and the insulating cooling liquid is pumped into the hollow chamber of the cover body 2 by setting the pump 6, and the cooling liquid is pumped into the hollow cavity of the cover body 2. The heated insulating cooling liquid is cooled in the chamber, and the cooled insulating cooling liquid is returned to the inside of the casing 1. This structure improves the heat dissipation rate of the battery pack by directly contacting the insulating cooling liquid with the battery pack, which can meet the The battery pack needs to quickly dissipate heat, and at the same time, the structure is simple, which is beneficial to reduce the manufacturing cost.

Further, the housing 1 is also provided with a flow-equalizing suction pipe 10, the inlet of the pump 6 is connected to the flow-equalizing suction pipe 10, and the flow-equalizing suction pipe 10 is closed at both ends and hollow. It has a tubular structure and is horizontally arranged on the side of the battery pack. The outer wall of the flow equalization pipette 10 is provided with a plurality of inlet holes arranged at equal intervals along the length direction of the flow equalization pipette 10. The battery pack It includes multiple rows of battery cells arranged along the length direction of the flow-equalizing pipette 10, and a cooling channel for the insulating cooling liquid to flow can be formed between any two adjacent rows of the battery cells, so The plurality of inlet holes on the flow equalization pipette 10 are respectively arranged in alignment with the plurality of cooling channels formed by the plurality of rows of the battery cells. Specifically, since the positions of the inlet holes correspond to the gaps of the single cells 8 , a uniform flow field of the cooling liquid of the battery pack can be ensured, thereby forming a relatively uniform cooling effect.

Further, since the insulating cooling liquid in the casing 1 will be heated by the single cells 8 while realizing the heat dissipation of the single cells 8, the temperature of the insulating cooling liquid sucked into the cover body 2 is relatively high, Therefore, the temperature of the insulating cooling liquid in the cover body 2 should be lowered to improve the cooling effect during the spray cooling process. A plurality of heat dissipation fins 11, the insulating cooling liquid in the cover body 2 exchanges heat with the external environment through the heat dissipation fins 11, so as to realize the heat dissipation of the insulating cooling liquid in the cover body 2; The heat dissipation effect of the insulating cooling liquid in the body 2 is shown in FIG. 1. In this embodiment, a heat dissipation fan 12 is provided on the outer side of the heat dissipation fin 11. The speed of air flow near the heat dissipation fins 11 further increases the speed of heat exchange between the insulating cooling liquid in the cover body 2 and the external environment.

In this embodiment, preferably, the wiring terminal is provided outside the housing 1 , and further preferably, the wiring terminal can be provided on the outer surface of the housing 1 or on the outer surface of the cover 2 . Outer surface, in this embodiment, the wiring terminals are arranged on the outer surface of the housing 1 , the number of the wiring terminals 9 is multiple, the housing 1 is in the shape of a rectangular parallelepiped, and a plurality of the wiring terminals 9 are arranged On one of the side surfaces of the housing 1 , the other three side surfaces of the housing 1 on which the connection terminals 9 are not provided are respectively provided with a plurality of the heat dissipation fins 11 arranged in a rectangular array. Specifically, by arranging heat dissipation fins 11 on the other three sides of the casing 1, the insulating cooling liquid in the casing 1 exchanges heat with the external environment through the heat dissipation fins 11, so as to realize the insulation of the casing 1. Direct cooling of the coolant.

In addition, the casing 1 is provided with a liquid inlet, the liquid outlet end of the pipeline 5 is connected to the liquid inlet, and the pump 6 and the liquid inlet are located on two sides of the battery pack, respectively. In this way, it can be ensured that the liquid inlet and outlet positions of the casing 1 are respectively located on both sides of the battery pack, thereby forming a flow cycle in the casing 1 and improving the heat dissipation effect on the battery pack. In addition, the cover body 2 is also provided with a liquid inlet, and the liquid outlet of the pipeline 5 is connected to the liquid inlet, wherein the liquid inlet and the liquid inlet are located on both sides of the cover body 2, so as to It is ensured that the liquid entering the cover body 2 must flow from one end to the other end before it can flow out of the cover body 2, which prolongs the residence time of the insulating cooling liquid in the cover body 2, thereby prolonging the cooling time of the insulating cooling liquid, and improving the insulation cooling liquid. The cooling effect of the coolant.

Further, a backup pump is also provided in the casing 1, and the backup pump is connected to the liquid inlet end of the pipeline 5. When the pump 6 fails, the backup pump is turned on immediately, thereby ensuring the battery pack. The heat is always dissipated, thereby improving the overall safety of the automotive power battery pack.

In this embodiment, the battery pack includes a plurality of single cells 8 respectively connected to the bottom surface of the casing 1 and arranged in a rectangular array. The bottom surface of the casing 1 is provided with a plurality of single cells 8 for supporting the The bracket 7 of the single battery 8, the lower end of the single battery 8 is fixedly connected with the bracket 7, so as to ensure that the position of the single battery 8 is always fixed relative to the casing 1, thereby improving the stability of the operation of the vehicle power battery pack .

Example 2

As shown in FIG. 3 , a liquid immersion cooling type automotive power battery pack provided in this embodiment, the difference between this embodiment and Embodiment 1 is that the heat dissipation fins 11 and the heat dissipation fan 12 on the cover body 2 are cancelled. , the liquid immersion cooling type automotive power battery pack also includes an air-cooled radiator 4, the pipeline 5 includes a heat-dissipating section 3, and the heat-dissipating section 3 is a coiled tubular structure. The radiator 4 is connected and located in the air-cooled radiator 4. Specifically, when the pump 6 sucks the insulating cooling liquid in the housing 1 and flows to the heat dissipation section 3, the air-cooled radiator 4 flows through the The insulating cooling liquid in the heat dissipation section 3 is air-cooled and dissipated to ensure that the temperature of the insulating cooling liquid flowing out of the heat dissipation section 3 and entering the casing 1 is low.

Other structures of a liquid immersion cooling type automotive power battery pack in this embodiment are the same as those in Embodiment 1, and will not be repeated here.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or a connectable connection. Detachable connection, or integral connection; may be mechanical connection or electrical connection; may be direct connection, or indirect connection through an intermediate medium, or internal communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principles of the present invention, several improvements and replacements can be made. These improvements And replacement should also be regarded as the protection scope of the present invention.

Claims (10)

1. A liquid immersion cooling type automotive power battery pack, characterized in that it comprises a casing with an upper end opening, a cover body sealingly connected to the upper end opening of the casing, and a terminal for connecting with an external circuit, so The cover is provided with a hollow chamber, the casing is provided with a battery pack, an insulating cooling liquid and a pump, the terminal is electrically connected with the battery pack, and the insulating cooling liquid fills the inner space of the casing , the pump is connected with the hollow chamber of the cover body through a pipeline, and the lower surface of the cover body is provided with a liquid outlet for communicating the interior of the casing and the hollow chamber. 2 . The liquid immersion cooling type automotive power battery pack according to claim 1 , wherein the casing is further provided with a flow-equalizing suction pipe, and the inlet of the pump is connected with the flow-equalizing suction pipe, 2 . The flow-equalizing pipette is a hollow tubular structure with closed ends and is horizontally arranged on the side of the battery pack. The outer wall of the flow-equalizing pipette is provided with a plurality of pipes along the length of the flow-equalizing pipette. The liquid inlet holes are arranged at equal intervals, and the battery pack includes multiple rows of battery cells arranged along the length direction of the flow equalizing pipette. The cooling channels through which the insulating cooling liquid flows, and the plurality of liquid inlet holes on the flow-equalizing liquid suction pipe are respectively arranged in alignment with the plurality of cooling channels formed by the plurality of rows of the battery cells. 3 . The liquid immersion cooling type automotive power battery pack according to claim 1 , wherein a plurality of heat dissipation fins are connected to the upper surface of the cover body. 4 . 4 . The liquid immersion cooling type automotive power battery pack according to claim 3 , wherein a cooling fan is provided on the outer side of the cooling fins. 5 . 5 . The liquid immersion cooling type automotive power battery pack according to claim 4 , wherein a plurality of the heat dissipation fins are provided on the side surface of the casing. 6 . 6 . The liquid immersion cooling type automotive power battery pack according to claim 1 , wherein the liquid immersion cooling type automotive power battery pack further comprises an air-cooled radiator, the pipe comprises a heat dissipation section, and the heat dissipation section It is a coiled tubular structure, and the heat dissipation section is connected with the air-cooled radiator and is located in the air-cooled radiator. 7 . The liquid immersion cooling type automotive power battery pack according to claim 1 , wherein the casing is provided with a liquid inlet, the liquid outlet end of the pipeline is connected to the liquid inlet, and the The pump and the liquid inlet are located on both sides of the battery pack, respectively. 8 . The liquid immersion cooling type automotive power battery pack according to claim 1 , wherein a backup pump is further provided in the casing, and the backup pump is connected to the liquid inlet end of the pipeline. 9 . 9 . The liquid immersion cooling type automotive power battery pack according to claim 2 , wherein the battery pack comprises a plurality of single cells respectively connected to the bottom surface of the casing and arranged in a rectangular array. 10 . 10 . The liquid immersion cooling type automotive power battery pack according to claim 9 , wherein a plurality of brackets for supporting the single cells are provided on the bottom surface of the casing. 11 .