Dynamic immersed cooling battery pack structure

Abstract

The invention discloses a dynamic immersion type cooling battery pack structure which comprises a battery box groove shell and a dry and wet partition plate, and the dry and wet partition plate is fixed in a box groove of the battery box groove shell and divides the box groove into a wiring harness bin and an immersion battery bin. The immersion battery bin forms a cooling liquid flow channel through a plurality of flow channel resistance reduction limiting partition plates which are alternately arranged on the cavity walls of the two sides, a battery cell is installed in the cooling liquid flow channel, a BMS battery management module is installed in the wiring harness bin, a plurality of connector holes are formed in a plate body of the dry-wet partition plate, wiring harness sealing connectors are installed in the connector holes, and the wiring harness sealing connectors are connected with the battery cell. A liquid discharge three-way switching valve pipe and a liquid inlet three-way switching valve pipe are arranged in the wiring harness bin, and two inlet end pipe orifices of the liquid discharge three-way switching valve pipe and two discharge end pipe orifices of the liquid inlet three-way switching valve pipe extend to the immersion battery bin. The cooling device has the beneficial effects of high cooling efficiency, uniform temperature distribution, simplified structure, reduced installation and maintenance cost and strong adaptability.

Description

Technical Field

[0001] The present invention relates to the field of battery packs, and particularly to a dynamic immersion cooling battery pack structure. Background Art

[0002] With the rapid development of electric vehicles and energy storage systems, the thermal management problem of battery packs has become a key factor restricting their performance and lifespan. The existing battery pack cooling technologies mainly include the following: Air cooling, which has low cost but poor heat dissipation effect and is difficult to meet the cooling requirements of high-power density batteries; Liquid cooling plate cooling, which dissipates heat by contacting the battery with the liquid cooling plate, but can only achieve local cooling with limited cooling efficiency; Static immersion cooling, which immerses the battery in an insulating liquid and uses the heat capacity of the liquid for heat dissipation, but the liquid has poor fluidity, uneven cooling, and lacks an active cooling mechanism; However, the cooling effect of air cooling is uneven, which easily leads to uneven battery temperature distribution. The liquid cooling plate cooling lacks an efficient active cooling mechanism and cannot meet the heat dissipation requirements of high-power density batteries. For static immersion cooling, the liquid has poor fluidity and cannot achieve rapid heat transfer between battery packs. Summary of the Invention

[0003] The purpose of the present invention is to provide a dynamic immersion cooling battery pack structure to solve the above problems.

[0004] The present invention achieves the above purpose through the following technical solutions: A dynamic immersion cooling battery pack structure includes a battery box tank shell and a dry-wet partition. The dry-wet partition is fixed in the tank of the battery box tank shell and divides the tank into a wire harness compartment and an immersion battery compartment. The immersion battery compartment forms a coolant flow channel through a plurality of alternately arranged flow channel resistance reduction and limit partitions on both side cavity walls. Battery cells are installed in the coolant flow channel, and a BMS battery management module is installed in the wire harness compartment. A plurality of connector holes are provided on the plate body of the dry-wet partition, and wire harness sealing connectors are installed in the connector holes. A drain three-way switching valve pipe and a liquid inlet three-way switching valve pipe are provided in the wire harness compartment. Two inlet pipe orifices of the drain three-way switching valve pipe and two drain pipe orifices of the liquid inlet three-way switching valve pipe both extend to the immersion battery compartment.

[0005] Further, the flow channel resistance reduction and limit partition consists of a heat-conducting partition main body and a plurality of resistance reduction strip grooves provided on both side plate surfaces of the heat-conducting partition main body.

[0006] Further, two liquid return holes are provided on both sides of the top of the plate body of the wet-dry partition board. The two inlet pipe orifices of the drain three-way switching valve pipe extend into the immersion battery compartment through the liquid return holes. Two liquid inlet holes are provided on both sides of the bottom of the plate body of the wet-dry partition board. The two discharge pipe orifices of the liquid inlet three-way switching valve pipe extend into the immersion battery compartment through the liquid inlet holes.

[0007] Further, the discharge pipe orifice of the drain three-way switching valve pipe extends to the outside of the battery box groove housing and is equipped with a drain pipe joint. The inlet pipe orifice of the liquid inlet three-way switching valve pipe extends to the outside of the battery box groove housing and is equipped with an inlet pipe joint.

[0008] Further, a maintenance hole is provided on the outer side wall of the wire harness compartment. A maintenance side cover is installed on the maintenance hole. An explosion-proof valve is installed on the maintenance side cover. An MSD protection part is also installed on the outer side wall of the wire harness compartment.

[0009] Further, a battery cell connection row is installed on the battery cell. The battery cell connection row is connected to the wire harness sealing joint through a wire harness. The wire harness sealing joint is connected to the BMS battery management module through a wire harness.

[0010] Further, a plurality of installation holes are provided on the upper edges of the battery box groove housing and the wet-dry partition board. Sealing gaskets are installed on the upper edges of the battery box groove housing and the wet-dry partition board.

[0011] Further, both the drain three-way switching valve pipe and the liquid inlet three-way switching valve pipe are composed of a three-way valve and valve orifice pipes respectively installed on the three valve orifices of the three-way valve.

[0012] The beneficial effects are as follows: high cooling efficiency, significantly improving the heat dissipation efficiency through the liquid flow and the active cooling mechanism of the liquid cooling unit; uniform temperature distribution, the liquid circulates among the battery packs and cooperates with the valve body to switch and flow in reverse alternately, ensuring rapid heat transfer and avoiding local overheating; simplified structure, adopting an immersion design, reducing complex pipelines and heat dissipation components, and reducing the installation and maintenance costs; strong adaptability, suitable for the thermal management requirements of high-power density batteries, and improving the safety and reliability of the battery system. Description of the Drawings

[0013] Figure 1 is a structural diagram of the dynamic immersion cooling battery pack structure of the present invention; Figure 2 is an internal structural diagram of the wire harness compartment of the dynamic immersion cooling battery pack structure of the present invention; Figure 3 is a schematic diagram of the flow channel resistance reduction and limit partition board of the dynamic immersion cooling battery pack structure of the present invention; Figure 4 It is a schematic diagram of a three-way switching valve pipe of the dynamic immersion cooling battery pack structure of the present invention.

[0014] The description of the reference numerals is as follows: 1. Battery box tank shell; 2. Dry-wet partition board; 3. Wiring harness compartment; 4. Immersion battery compartment; 5. Flow channel resistance reduction limiting partition board, 51. Main body of the heat conduction partition board, 52. Resistance reduction strip groove; 6. Drain three-way switching valve pipe, 61. Three-way valve, 62. Valve port pipe; 7. Liquid inlet three-way switching valve pipe; 8. BMS battery management module; 9. Wiring harness sealing joint; 10. Battery cell; 11. Battery cell connection row; 12. Sealing gasket; 13. Drain pipe joint; 14. Liquid inlet pipe joint; 15. Maintenance side cover; 16. MSD protection part; 17. Explosion-proof valve. Specific embodiments

[0015] The present invention will be further described below in conjunction with the accompanying drawings: As Figures 1 - 4 shown, a dynamic immersion cooling battery pack structure includes a battery box tank shell 1 and a dry-wet partition board 2; The dry-wet partition board 2 is fixed in the tank of the battery box tank shell 1 and divides the tank into a wiring harness compartment 3 and an immersion battery compartment 4. The wiring harness compartment 3 is a dry area, mainly used for storing control components and wiring harnesses. The immersion battery compartment 4 is a wet area, and its temperature is reduced by the circulation of the coolant. Moreover, the battery box tank shell 1 and the dry-wet partition board 2 are aluminum profile frameworks, which have good protection performance and heat dissipation performance; The immersion battery compartment 4 forms a coolant flow channel through a plurality of alternately arranged flow channel resistance reduction limiting partition boards 5 on both side cavity walls. The coolant flows in the coolant flow channel, thereby reducing the temperature of the battery cell 10 and taking away the heat generated during the use of the battery cell 10. The battery cell 10 is installed in the coolant flow channel; The BMS battery management module 8 is installed in the wiring harness compartment 3, which is an essential accessory for the current battery pack and will not be further elaborated here. A plurality of joint holes are provided on the board body of the dry-wet partition board 2, and the wiring harness sealing joint 9 is installed in the joint holes. The wiring harness sealing joint 9 is an intermediate part for the communication connection between the battery cell 10 and the BMS battery management module 8. A waterproof design is adopted here to prevent liquid from seeping into the wiring harness compartment 3; A drain three-way switching valve pipe 6 and a liquid inlet three-way switching valve pipe 7 are provided in the wiring harness compartment 3. The drain three-way switching valve pipe 6 has a two-in-one-out structure, with two inlet end pipes and one drain end pipe. The liquid inlet three-way switching valve pipe 7 has a one-in-two-out structure. The two inlet end pipes of the drain three-way switching valve pipe 6 and the two drain end pipes of the liquid inlet three-way switching valve pipe 7 all extend into the immersion battery compartment 4 to realize the flow of the coolant in the coolant flow channel and the conversion of the flow direction.

[0016] As Figures 1 - 4 shown, the present invention also discloses the following various more optimized specific structures: The flow channel resistance reduction limiting partition 5 is composed of a heat-conducting partition main body 51 and a number of resistance reduction strip grooves 52 arranged on both side surfaces of the heat-conducting partition main body 51. When the coolant flows, due to the small gap between the flow channel resistance reduction limiting partition 5 and the battery cell 10, the flow resistance of the coolant is reduced through the resistance reduction strip grooves 52, and a part of the coolant flows through the resistance reduction strip grooves 52.

[0017] Two liquid return holes are provided on both sides of the top of the plate body of the dry-wet partition 2. The two inlet pipe orifices of the drain three-way switching valve pipe 6 extend into the immersion battery compartment 4 through the liquid return holes. Two liquid inlet holes are provided on both sides of the bottom of the plate body of the dry-wet partition 2. The two drain pipe orifices of the inlet three-way switching valve pipe 7 extend into the immersion battery compartment 4 through the liquid inlet holes.

[0018] The drain pipe orifice of the drain three-way switching valve pipe 6 extends to the outside of the battery box tank shell 1 and is equipped with a drain pipe joint 13. The inlet pipe orifice of the inlet three-way switching valve pipe 7 extends to the outside of the battery box tank shell 1 and is equipped with an inlet pipe joint 14. The drain pipe joint 13 and the inlet pipe joint 14 are used to connect to the main coolant circulation pipeline, and the main coolant circulation pipeline can supply heat dissipation for multiple battery packs at the same time.

[0019] An inspection hole is provided on the outer wall of the wire harness compartment 3. An inspection side cover 15 is installed on the inspection hole, and an explosion-proof valve 17 is installed on the inspection side cover 15. An MSD protection part 16 is also installed on the outer wall of the wire harness compartment 3, which is a common protection fuse structure.

[0020] A battery cell connection row 11 is installed on the battery cell 10. The battery cell connection row 11 is connected to the wire harness sealing joint 14 through a wire harness, and the wire harness sealing joint 14 is connected to the BMS battery management module 8 through a wire harness.

[0021] A number of mounting holes are provided on the upper edges of the battery box tank shell 1 and the dry-wet partition 2 for installing the cover body. A sealing gasket 12 is installed on the upper edges of the battery box tank shell 1 and the dry-wet partition 2 to further improve the sealing performance of the battery pack. The sealing gasket 12 adopts an IP67-level sealing ring.

[0022] Both the drain three-way switching valve pipe 6 and the inlet three-way switching valve pipe 7 are composed of a three-way valve 61 and valve port pipes 62 respectively installed on the three valve ports of the three-way valve 61.

[0023] As Figures 1 - 4 The dynamic immersion cooling battery pack structure shown mainly dissipates heat from the battery cells 10 in the immersion battery compartment 4 through the coolant. The immersion battery compartment 4 is separated into coolant flow channels by a number of alternately arranged flow channel resistance reduction limiting partitions 5, and the heat is carried away by the flow of the coolant through the coolant flow channels; The flow direction of the coolant in the coolant flow channel can be switched. When flowing in the coolant flow channel, the temperature of the coolant is low when it first enters the channel. As it absorbs the heat of the battery cells, the temperature gradually rises, resulting in a temperature difference between the inlet end and the outlet end of the coolant in the coolant flow channel. The heat dissipation effect at the outlet end is relatively poor. Therefore, a drain three-way switching valve pipe 6 and a liquid inlet three-way switching valve pipe 7 are provided. By switching the valve ports of the three-way valve, the conversion of the coolant flow direction in the coolant flow channel is realized, so as to achieve uniform heat dissipation of the battery cells at each position; The BMS battery management module 8 and the battery cell connection row 11 are connected through a wire harness sealing joint 9, so that the wire harness bin 3 and the immersed battery bin 4 are separated between dry and wet, and the coolant is prevented from siphoning and leaking along the wire harness; The heat conduction partition body 51 defines the path of the flow channel. The coolant flows in from below and out from above to realize circulation, and better control the temperature between the battery cells.

[0024] Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A dynamic immersion cooling battery pack structure, characterized in that: It includes a battery box tank shell and a dry-wet partition, the dry-wet partition is fixed in the box tank of the battery box tank shell and the box tank is divided into a wiring harness compartment and an immersed battery compartment, the immersed battery compartment forms a coolant flow channel through a plurality of alternately arranged flow channel resistance reduction and limit partitions on the cavity walls on both sides, the coolant flow channel is installed with battery cells, the wiring harness compartment is installed with a BMS battery management module, the plate body of the dry-wet partition is provided with a plurality of joint holes, the joint holes are provided with wiring harness sealing joints, the wiring harness compartment is provided with a drain three-way switching valve pipe and a liquid inlet three-way switching valve pipe, the two inlet end pipe openings of the drain three-way switching valve pipe and the two drain end pipe openings of the liquid inlet three-way switching valve pipe all extend to the immersed battery compartment.

2. A dynamic immersion cooling battery pack structure according to claim 1, characterized in that: The flow channel resistance reduction and limiting baffle is composed of a heat-conducting baffle body and a plurality of resistance reduction grooves arranged on the plate surfaces on both sides of the heat-conducting baffle body.

3. The dynamic immersion cooling battery pack structure according to claim 1, characterized in that: Two liquid return holes are provided on both sides of the top of the plate body of the dry-wet partition, and the two inlet pipe openings of the drainage three-way switching valve pipe extend into the submerged battery compartment through the liquid return holes. Two liquid inlet holes are provided on both sides of the bottom of the plate body of the dry-wet partition, and the two discharge pipe openings of the liquid inlet three-way switching valve pipe extend into the submerged battery compartment through the liquid inlet holes.

4. The dynamic immersion cooling battery pack structure according to claim 1, characterized in that: The discharge end pipe opening of the three-way switching valve pipe for liquid discharge extends to the outside of the battery box tank shell and is installed with a discharge pipe joint, and the inlet end pipe opening of the three-way switching valve pipe for liquid inlet extends to the outside of the battery box tank shell and is installed with an inlet pipe joint.

5. The dynamic immersion cooling battery pack structure according to claim 1, characterized in that: An inspection hole is provided on the outer wall of the wiring harness bin, an inspection side cover is installed on the inspection hole, an explosion-proof valve is installed on the inspection side cover, and an MSD protective part is also installed on the outer wall of the wiring harness bin.

6. The dynamic immersion cooling battery pack structure according to claim 1, characterized in that: A cell connection row is installed on the cell, the cell connection row is connected to the wiring harness sealing joint through a wiring harness, and the wiring harness sealing joint is connected to the BMS battery management module through a wiring harness.

7. The dynamic immersion cooling battery pack structure according to claim 1, characterized in that: A plurality of mounting holes are arranged on the upper edges of the battery box tank shell and the dry-wet partition, and sealing gaskets are installed on the upper edges of the battery box tank shell and the dry-wet partition.

8. The dynamic immersion cooling battery pack structure according to claim 1, characterized in that: The three-way switching valve pipe for liquid discharge and the three-way switching valve pipe for liquid inlet are both composed of a three-way valve and valve port pipes respectively installed on the three valve ports of the three-way valve.

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