Static immersion liquid cooling power battery pack

Abstract

The utility model relates to a static immersion liquid cooling power battery pack in the field of battery packs, which comprises a box body and a box cover, an accommodating cavity for mounting a battery cell module is formed in the box body, a mounting groove is formed in the box cover through die casting, a heat dissipation plate is connected in the mounting groove through a heat preservation layer, a heat dissipation pipeline is arranged on the heat dissipation plate, and the heat dissipation pipeline is communicated with the accommodating cavity. A heat dissipation pipeline is arranged in the heat dissipation plate, a pipeline groove used for embedding the heat dissipation pipeline is formed in the contact face of the heat dissipation plate and the heat preservation layer, a refrigerant is guided into the heat dissipation pipeline through an inlet, and the containing cavity is filled with static cooling liquid. And a refrigerant flows along the heat dissipation pipeline, so that contact refrigeration is carried out on the heat dissipation plate, and heat exchange refrigeration is carried out on the cooling liquid through the heat dissipation plate, so that the heat in the accommodating cavity is carried out and is led out through a lead-out opening of the heat dissipation pipeline, and the temperature uniformity and the use stability of the battery cell module are further maintained.

Description

Technical Field

[0001] The utility model relates to the field of battery packs, and specifically relates to a static immersion liquid-cooled power battery pack. Background Art

[0002] With the continuous growth of the global demand for renewable energy and clean energy, power battery packs are widely used in multiple fields, including but not limited to key components such as electric vehicles, hybrid vehicles, and energy storage power stations. Their performance, safety, and reliability have received unprecedented attention. As the energy core, the power battery pack not only requires high energy density and long cycle life but also needs to maintain stable operating performance in extreme environments.

[0003] Currently, power battery packs widely adopt a modular design, that is, multiple single cells are combined in series and parallel to form battery modules, and then multiple modules are further assembled into a battery pack. The battery pack usually includes key components such as a battery management system (BMS), a thermal management system, and an electrical connection system. The thermal management system is crucial for ensuring battery safety and extending battery life.

[0004] However, the existing power battery packs are mainly divided into two categories in terms of heat dissipation: air cooling and liquid cooling. Air cooling removes the heat generated by the battery through air flow, while the liquid cooling system removes the heat generated by the battery through circulating coolant. However, the existing circulating liquid cooling for heat dissipation requires an oil pump to maintain the circulation of the coolant. The oil pump will occupy a certain space, and the operation of the oil pump will increase the pressure inside the power battery pack. In addition, under the drive of the oil pump, the coolant circulates and stirs, reducing the service life of the coolant, which is not conducive to the cooling use of the battery pack. Moreover, the uniformity and suitability of the existing battery pack for heat dissipation and cooling are poor, affecting the balanced heat dissipation of the battery pack and being not conducive to the stable use inside the battery pack. Summary of the Utility Model

[0005] The purpose of the utility model is to solve the above defects and provide a static immersion liquid-cooled power battery pack to solve the technical problems that the coolant is prone to agitation under the oil pump-driven circulating liquid cooling, which further increases the pressure inside the battery pack, and the existing battery pack has poor heat dissipation balance effect and is not conducive to stable use.

[0006] The purpose of the utility model is achieved in the following way:

[0007] A static immersion liquid-cooled power battery pack comprises a box body and a box cover, wherein the box cover is mounted on the box body in a paired manner, a receiving cavity for mounting a battery cell module is formed inside the box body, a mounting groove is formed in the box cover by die-casting, a heat sink is connected in the mounting groove via a thermal insulation layer, a heat dissipation pipe is arranged on the heat dissipation plate, an inlet and an outlet are respectively formed at both ends of the heat dissipation pipe, both the inlet and the outlet extend outward through the box cover, a pipe groove for embedding the heat dissipation pipe is formed on the contact surface between the heat dissipation plate and the thermal insulation layer, a refrigerant is introduced into the heat dissipation pipe via the inlet, a static coolant is filled in the receiving cavity, the coolant is used to immerse the battery cell module, and the coolant is in immersed contact with the heat dissipation plate.

[0008] Further in the above description, the installation groove is formed on the inner side of the box cover, the thermal insulation layer is embedded in the installation groove, and the heat dissipation plate is in contact with and connected to the surface of the thermal insulation layer.

[0009] Further in the above description, the contact surface between the heat sink and the thermal insulation layer is arranged in a plane, and a surface of the heat sink extending toward the accommodating cavity is formed with a plurality of heat sink fins, and the heat sink fins are immersed in contact with the coolant.

[0010] Specifically, the coolant is statically filled in the accommodating cavity and is immersed in the electrical module and the heat sink. The provided heat dissipation fins increase the contact area with the coolant. Heat is exchanged between the heat dissipation fins and the coolant, and the heat is exchanged through the heat dissipation pipes on the heat sink. The heat generated by the battery cell module is discharged to the outside through the heat dissipation pipes, thereby maintaining the uniformity and suitability of the temperature of the battery cell module, thereby enhancing the stability of the use of the battery cell module in the accommodating cavity.

[0011] Further in the above description, the pipeline grooves are distributed at intervals along the surface of the heat dissipation plate, so that the heat dissipation pipes are extended and embedded along the pipeline grooves.

[0012] Optionally, the inlet and outlet of the heat dissipation pipe are connected to an external refrigeration air conditioner so that the refrigerant air circulates along the heat dissipation pipe to cool the heat dissipation plate.

[0013] Further in the above description, the box body and the box cover are connected by sealing screws, and a sealing rubber pad is provided between the box body and the box cover.

[0014] Further in the above description, the edges of the box body and the box cover are respectively formed with a connecting flange and a mounting flange, the connecting flange and the mounting flange are paired, a sealing gasket is arranged between the connecting flange and the mounting flange, a connecting plate is arranged on the connecting flange, a sealing reinforcement plate is arranged on the mounting flange, and the sealing screws pass through the sealing reinforcement plate, the mounting flange, the sealing gasket and the connecting flange in sequence, and are connected to the connecting plate.

[0015] Specifically, a connecting plate and a sealing and strengthening plate are provided to enhance the connection stability between the box body and the box cover, thereby further improving the sealing performance of the connection between the box body and the box cover.

[0016] Further, in the above description, the battery cell module is electrically connected to a connection port, the connection port is arranged on one side of the box body, a control box is arranged on the side surface of the box body close to the connection port, and an output port is arranged on the outer side surface of the control box.

[0017] The beneficial effects of the present utility model are as follows: the provided heat dissipation pipeline is embedded in the pipeline groove of the heat dissipation plate, the heat dissipation plate is installed in the installation groove of the box cover through the heat preservation layer, the accommodating cavity is filled with a coolant, the coolant submerges and wraps the battery cell module and the heat dissipation plate to increase the contact area of the coolant. After the coolant absorbs the heat generated by the battery cell module, the provided heat dissipation pipeline introduces the external refrigerant through the inlet, and the refrigerant flows along the heat dissipation pipeline, thereby performing contact refrigeration on the heat dissipation plate and performing heat exchange refrigeration on the coolant through the heat dissipation plate, so that the heat in the accommodating cavity is carried and exported through the outlet of the heat dissipation pipeline, further maintaining the uniformity and suitability of the temperature of the battery cell module. At the same time, the static setting of the coolant reduces the setting and use of the driving oil pump of the coolant, and reduces the agitation of the coolant and the pressure on the battery pack, thereby prolonging the service life of the coolant, improving the heat dissipation efficiency, and ensuring the safe operation and performance stability of the battery pack. Description of the Drawings

[0018] Figure 1 is a perspective view of this embodiment;

[0019] Figure 2 is an exploded view of this embodiment;

[0020] Figure 3 is a structural schematic diagram of the control box in this embodiment;

[0021] Figure 4 is Figure 3 a partial enlarged schematic view of A in

[0022] Figure 5 is a top view of this embodiment;

[0023] Figure 6 is Figure 5 a cross-sectional view taken along B-B in

[0024] Figure 7 is a schematic diagram of the immersion use state of the coolant in this embodiment;

[0025] The reference numerals in the figure are respectively: 1 - box body, 2 - box cover, 3 - accommodation cavity, 4 - installation groove, 5 - thermal insulation layer, 6 - heat dissipation plate, 7 - heat dissipation pipeline, 8 - inlet, 9 - outlet, 10 - pipeline groove, 11 - heat dissipation fins, 12 - sealing screw, 13 - sealing gasket, 14 - connecting flange, 15 - installation flange, 16 - connecting plate, 17 - sealing reinforcement plate, 18 - connection port, 19 - control box, 20 - output port, 21 - battery cell module. Detailed implementation manners

[0026] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0027] In this embodiment, referring to Figures 1-7 , a static immersion liquid-cooled power battery pack implemented specifically includes a box body 1 and a box cover 2. The box cover 2 is paired and installed on the box body 1. An accommodation cavity 3 for installing the battery cell module 21 is formed inside the box body 1. An installation groove 4 is formed in the box cover 2 by die-casting. A heat dissipation plate 6 is connected in the installation groove 4 through a thermal insulation layer 5. A heat dissipation pipeline 7 is arranged on the upper surface of the heat dissipation plate 6. Inlets 8 and outlets 9 are respectively formed at both ends of the heat dissipation pipeline 7. The inlets 8 and outlets 9 both extend outwards through the box cover 2. A pipeline groove 10 for embedding the heat dissipation pipeline 7 is formed on the contact surface between the heat dissipation plate 6 and the thermal insulation layer 5. A refrigerant is introduced into the heat dissipation pipeline 7 through the inlet 8. A static coolant is filled in the accommodation cavity 3. The coolant is used to immerse the battery cell module 21, and the coolant is in immersion contact with the heat dissipation plate 6.

[0028] In this embodiment, the installation groove 4 is formed on the inner side surface of the box cover 2. The thermal insulation layer 5 is embedded in the installation groove 4. The heat dissipation plate 6 is in surface contact with the thermal insulation layer 5 and is connected. Specifically, the thermal insulation layer 5 is made of a flame-retardant foaming layer, so that the thermal insulation layer 5 is filled in the heat dissipation plate 6 and the installation groove 4, improving the sealing and flame-retardant effect during use. The upper surface of the contact between the heat dissipation plate 6 and the thermal insulation layer 5 is flat, and the lower surface of the heat dissipation plate 6 extending towards the accommodation cavity 3 is formed with heat dissipation fins 11. The heat dissipation fins 11 are in immersion contact with the coolant. Specifically, the coolant is statically filled in the accommodation cavity 3 and is immersed with the electrical module and the heat dissipation plate 6. The arranged heat dissipation fins 11 enhance the contact area with the coolant, and heat exchange is carried out through the contact between the heat dissipation fins 11 and the coolant, and heat exchange is carried out by the heat dissipation pipeline 7 on the heat dissipation plate 6, so that the heat generated by the battery cell module 21 is exported to the outside through the heat dissipation pipeline 7, thereby maintaining the uniformity and suitability of the temperature of the battery cell module 21, and thus enhancing the stability of the use of the battery cell module 21 in the accommodation cavity 3.

[0029] In this embodiment, the pipeline grooves 10 are distributed at intervals along the upper surface of the heat dissipation plate 6, so that the heat dissipation pipelines 7 are installed by extending and embedding along the pipeline grooves 10. Specifically, the heat dissipation pipelines 7 are installed on the pipeline grooves 10. The refrigerant from the outside is introduced into the heat dissipation pipelines 7, so that the heat of the heat dissipation plate 6 is exchanged and cooled through the heat dissipation pipelines 7, and the heat of the heat dissipation plate 6 is exchanged and cooled with the coolant by contacting the coolant. The statically arranged coolant is wrapped around the battery cell module 21 to further complete the cooling of the battery cell module 21.

[0030] Specifically, the inlet 8 and the outlet 9 of the heat dissipation pipeline 7 are connected to an external refrigeration air conditioner, so that the refrigerant air circulates along the heat dissipation pipeline 7, thereby cooling and lowering the temperature of the heat dissipation plate 6.

[0031] In this embodiment, the box body 1 and the box cover 2 are connected by sealing screws 12, and a sealing gasket 13 is arranged between the box body 1 and the box cover 2. The sealing gasket 13 is provided to enhance the sealing performance of the connection between the box body 1 and the box cover 2 and reduce the risk of leakage of the internal coolant.

[0032] In this embodiment, connection flanges 14 and mounting flanges 15 are respectively formed at the edges of the box body 1 and the box cover 2. The connection flanges 14 and the mounting flanges 15 are paired, and the sealing gasket 13 is arranged between the connection flanges 14 and the mounting flanges 15. A connecting plate 16 is arranged on the lower surface of the connection flange 14, and a sealing reinforcement plate 17 is arranged on the upper surface of the mounting flange 15. The sealing screws 12 sequentially pass through the sealing reinforcement plate 17, the mounting flange 15, the sealing gasket 13 and the connection flange 14 and are connected to the connecting plate 16. Specifically, the connecting plate 16 and the sealing reinforcement plate 17 are provided to enhance the connection stability between the box body 1 and the box cover 2, thereby further improving the sealing performance of the connection between the box body 1 and the box cover 2.

[0033] In this embodiment, the battery cell module 21 is electrically connected to a connection port 18. The connection port 18 is arranged on one side of the box body 1. A control box 19 is provided on the side of the box body 1 close to the connection port 18, and an output port 20 is arranged on the outer side of the control box 19.

[0034] The control box 19 is provided with positive and negative output contactors, a pre-charge resistor and a fuse protector.

[0035] Specifically, both the box body 1 and the box cover 2 are integrally formed by die casting.

[0036] The specific working principle in this embodiment is:

[0037] Install the battery cell module 21 in the accommodation cavity 3, and inject coolant into the accommodation cavity 3. The provided heat dissipation pipeline 7 is embedded on the pipeline groove 10 of the heat dissipation plate 6, so that the heat dissipation plate 6 is installed in the installation groove 4 of the box cover 2 through the heat insulation layer 5. The heat dissipation fins 11 on the heat dissipation plate 6 extend into the accommodation cavity 3, and the box cover 2 and the box body 1 are hermetically connected by the sealing screw 12. The battery cell module 21 and the heat dissipation plate 6 are wrapped by the coolant. The provided heat dissipation fins 11 increase the contact area with the coolant, so that when the battery cell module 21 generates heat, the coolant absorbs the generated heat. The provided heat dissipation pipeline 7 is connected to an external refrigeration air conditioner through the inlet 8 and the outlet 9. The external refrigerant air is introduced through the inlet 8, and the refrigerant air flows along the heat dissipation pipeline 7, so as to perform contact refrigeration on the heat dissipation plate 6, and perform heat exchange refrigeration on the coolant through the heat dissipation plate 6, so that the heat in the accommodation cavity 3 is carried and exported through the outlet 9 of the heat dissipation pipeline 7, further maintaining the uniformity and suitability of the temperature of the battery cell module 21. Specifically, the coolant exchanges heat with the heat of the battery cell module 21, and further exchanges heat with the coolant through the contact between the heat dissipation plate 6 and the coolant, so that the heat dissipation pipeline 7 performs heat exchange refrigeration on the heat dissipation plate 6. At the same time, the static setting of the coolant in this embodiment reduces the setting and use of the driving oil pump of the coolant, as well as reduces the agitation of the coolant and the pressure on the battery pack, thereby prolonging the service life of the coolant, improving the heat dissipation efficiency, and ensuring the safe operation and performance stability of the battery pack.

[0038] The above is only a preferred embodiment of the present invention, and it is not intended to limit the present invention in any form. Although the present invention is disclosed above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, when making some changes or modifications using the above-disclosed technical content as equivalent change equivalent embodiments, but as long as it does not depart from the content of the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical meaning of the present invention shall fall within the scope of the technical solution of the present invention.

Claims

1. A static immersion liquid-cooled power battery pack, comprising a box body and a box cover, the box cover is paired and installed on the box body, and an accommodating cavity for installing a battery cell module is formed inside the box body, and it is characterized in that: An installation groove is formed in the box cover by die-casting. A heat dissipation plate is connected in the installation groove through a heat insulation layer. A heat dissipation pipeline is arranged on the heat dissipation plate. Inlets and outlets are respectively formed at both ends of the heat dissipation pipeline. Both the inlet and the outlet extend outwards through the box cover. Pipeline grooves for embedding the heat dissipation pipeline are formed on the contact surface between the heat dissipation plate and the heat insulation layer. A refrigerant is introduced into the heat dissipation pipeline through the inlet. A static coolant is filled in the accommodating cavity. The coolant is used to immerse the battery cell module, and the coolant is in immersion contact with the heat dissipation plate.

2. The static immersion liquid-cooled power battery pack according to claim 1, wherein: The installation groove is formed on the inner side surface of the box cover. The heat insulation layer is embedded in the installation groove. The heat dissipation plate is in surface contact with the heat insulation layer and is connected thereto.

3. The static immersion liquid-cooled power battery pack according to claim 2, wherein: The contact surface between the heat dissipation plate and the heat insulation layer is arranged as a plane, and a plurality of heat dissipation fins are formed on the surface of the heat dissipation plate extending towards the accommodating cavity. The heat dissipation fins are in immersion contact with the coolant.

4. The static immersion liquid-cooled power battery pack according to claim 1, wherein: The pipeline grooves are distributed at intervals along the surface of the heat dissipation plate, so that the heat dissipation pipeline is installed by extending and embedding along the pipeline grooves.

5. The static immersion liquid-cooled power battery pack according to claim 1, characterized in that: The box body and the box cover are connected by sealing screws, and a sealing gasket is arranged between the box body and the box cover.

6. The static immersion liquid-cooled power battery pack according to claim 5, wherein: Connection flanges and installation flanges are respectively formed at the edges of the box body and the box cover. The connection flanges and the installation flanges are paired. The sealing gasket is arranged between the connection flanges and the installation flanges. A connection plate is arranged on the connection flange, and a sealing reinforcement plate is arranged on the installation flange. The sealing screws sequentially pass through the sealing reinforcement plate, the installation flange, the sealing gasket and the connection flange and are connected to the connection plate.

7. The static immersion liquid-cooled power battery pack according to any one of claims 1-6, characterized in that: The battery cell module is electrically connected to a connection port. The connection port is arranged on one side of the box body. A control box is arranged on the side surface of the box body close to the connection port. An output port is arranged on the outer side surface of the control box.

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