A pump-free electrically driven liquid-cooled battery box device

Abstract

The utility model discloses a kind of pumpless electric drive liquid cooling battery box devices, including integrally die-casting box, its inside is divided into battery cabin and cooling liquid cabin by partition, and its outer bottom is attached to set up the liquid cooling plate of inner flow channel;Inlet section and outlet section of flow channel are respectively corresponding to set up inlet flexible check valve and outlet flexible check valve, and the inner wall of flow channel between two valves is attached with electroactive polymer;Electroactive polymer is connected with alternating current power supply, generates radial periodic deformation drive cooling liquid from inlet flexible check valve to outlet flexible check valve directional flow. The utility model drives traditional pump by electroactive polymer deformation drive belt, and set up flexible check valve to prevent backflow, effectively reduce the power consumption of battery box liquid cooling system.

Description

Technical Field

[0001] This utility model belongs to the field of battery box technology, and in particular relates to a pumpless electrically driven liquid-cooled battery box device. Background Technology

[0002] In the cooling of battery boxes, traditional liquid cooling systems usually rely on external water pumps to drive the circulation of coolant. This structure not only increases the complexity and cost of the system, but also results in high power consumption, pump vibration leading to failure, and aging of seals causing leakage, thus affecting the reliability and integration of the liquid cooling system. Summary of the Invention

[0003] Purpose of the invention: In order to overcome the shortcomings of the existing technology, this utility model provides a pumpless electrically driven liquid-cooled battery box device, which uses an electroactive polymer deformation drive belt to drive a traditional pump and is equipped with a flexible one-way valve to prevent backflow, effectively reducing the power consumption of the liquid cooling system of the battery box.

[0004] Technical solution: To achieve the above objectives, the present invention provides a pumpless electrically driven liquid-cooled battery box device, comprising an integrally die-cast box body, the interior of which is divided into a battery compartment and a coolant compartment by a partition, and a liquid-cooled plate with an internal flow channel is attached to the bottom of the box.

[0005] The inlet and outlet sections of the flow channel are respectively equipped with an inlet flexible check valve and an outlet flexible check valve, and the inner wall of the flow channel between the two valves is bonded with an electroactive polymer.

[0006] The electroactive polymer is connected to an AC power source, generating radial periodic deformation that drives the coolant to flow directionally from the inlet flexible check valve to the outlet flexible check valve.

[0007] Furthermore, the electroactive polymer is a dielectric elastomer.

[0008] Furthermore, the periodic deformation of the electroactive polymer includes:

[0009] Expansion deformation: When energized, radial expansion compresses the coolant, pushing the outlet flexible check valve to open;

[0010] Contraction deformation: When power is cut off, elastic contraction generates negative pressure, draws in coolant and opens the inlet flexible check valve.

[0011] Furthermore, the electroactive polymer is distributed on the sidewalls of the flow channel, bypassing the top and bottom walls.

[0012] Furthermore, the inlet flexible check valve or outlet flexible check valve includes a graphene valve plate and a limiting block; one end of the graphene valve plate is fixed to the top wall of the flow channel; the limiting block corresponds to the free end of the graphene valve plate and is disposed on the bottom wall of the flow channel; the graphene valve plate has an angle with the bottom wall of the flow channel.

[0013] Furthermore, the graphene valve plate of the inlet flexible check valve is tilted inwards towards the inside of the flow channel, while the graphene valve plate of the outlet flexible check valve is tilted inwards towards the outside of the flow channel.

[0014] Furthermore, the outer wall of the housing is provided with impact-resistant grooves.

[0015] Furthermore, water nozzles are provided at the input and output ends of the corresponding connecting channels. The water nozzles are welded to the liquid cooling plate and extend into the coolant tank.

[0016] Beneficial effects: This invention uses an electroactive polymer connected to an AC power source to generate radial periodic deformation, driving the coolant to flow directionally from the inlet flexible check valve to the outlet flexible check valve. This achieves coolant circulation within the flow channel without the need for an external pump, simplifying the liquid cooling system structure, reducing cost and power consumption. It also replaces the rotational motion of a mechanical pump, eliminates shaft seal leakage points, achieves high sealing performance, and the unidirectional flow of coolant avoids thermal efficiency degradation caused by coolant backflow, thus improving the system's reliability and integration. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the liquid cooling plate structure;

[0019] Figure 3 for Figure 2 A schematic diagram of the structure cut along section line AA. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] like Figure 1 As shown, a pumpless electrically driven liquid-cooled battery box device includes an integrally die-cast box 1, which is internally divided into a battery compartment 1a and a coolant compartment 1b by a partition 11, and a liquid cooling plate 2 with an internal flow channel 20 is attached to its bottom.

[0022] like Figure 2 and Figure 3As shown, the inlet section and outlet section of the flow channel 20 are respectively equipped with an inlet flexible check valve 3 and an outlet flexible check valve 4, and an electroactive polymer 6 is attached to the inner wall of the flow channel 20 between the two valves. The electroactive polymer 6 is connected to an AC power source and generates radial periodic deformation to drive the coolant to flow directionally from the inlet flexible check valve 3 to the outlet flexible check valve 4. This enables the coolant to circulate within the flow channel 20 without the need for an external pump, simplifying the liquid cooling system structure and reducing cost and power consumption. At the same time, it replaces the rotational motion of the mechanical pump, eliminates shaft seal leakage points, achieves high sealing performance, and the unidirectional flow of the coolant avoids the thermal efficiency decay caused by coolant backflow, thus improving the reliability and integration of the system.

[0023] In this invention, preferably, the electroactive polymer 6 is a dielectric elastomer. Dielectric elastomers possess excellent elasticity and electroactivity properties, enabling them to undergo significant deformation under an alternating electric field with a fast deformation response. This allows for more effective driving of coolant flow, ensuring the dynamic stability of coolant circulation. Furthermore, the dielectric elastomer has a response frequency of 100Hz, adapting to fast charging and discharging conditions of batteries, and a driving voltage of less than 50V, resulting in lower power consumption compared to mechanical pumps.

[0024] like Figure 2 or Figure 3 As shown, the periodic deformation of the electroactive polymer 6 includes: expansion deformation: when energized, radial expansion compresses the coolant, pushing the outlet flexible check valve 4 to open; contraction deformation: when de-energized, elastic contraction generates negative pressure, drawing in coolant and opening the inlet flexible check valve 3. This coolant directional flow mode, based on the deformation characteristics of the electroactive polymer 6, precisely matches the deformation phase with the valve opening and closing, accurately controlling the coolant's inlet and outlet direction and flow process, avoiding coolant backflow and ineffective circulation, and improving net flow output efficiency, thus enhancing the cooling performance of the liquid cooling system.

[0025] It should be noted that in this invention, the electroactive polymer 6 is distributed on the side wall of the flow channel 20, avoiding the top and bottom walls of the flow channel 20. The electroactive polymer 6 is only attached to the side wall, and the side wall is not fully covered by the electroactive polymer 6. This allows the metal substrate of the top and bottom walls to conduct heat directly, avoiding the polymer insulation layer from hindering heat transfer and affecting the heat conduction efficiency of the liquid cooling plate 2.

[0026] like Figure 3 As shown, the inlet flexible check valve 3 or outlet flexible check valve 4 includes a graphene valve plate 41 and a limiting block 42; one end of the graphene valve plate 41 is fixed to the top wall of the flow channel 20; the limiting block 42 corresponds to the free end of the graphene valve plate 41 and is disposed on the bottom wall of the flow channel 20; the graphene valve plate 41 and the bottom wall of the flow channel 20 have an angle. When the graphene valve plate 41 is closed, it fits against the limiting block 42 on the bottom wall; when it is open, it bends.

[0027] The graphene valve plate 41 of the inlet flexible check valve 3 is tilted towards the inside of the flow channel 20, while the graphene valve plate 41 of the outlet flexible check valve 4 is tilted towards the outside of the flow channel. The inlet flexible check valve 3 is tilted inward to reduce opening pressure loss in the direction of flow, while the outlet flexible check valve 4 is tilted outward to reduce backflow during closure, forming an asymmetrical tilt angle structure of the valve plate, which can reduce system flow resistance.

[0028] The outer wall of the box 1 is provided with an impact-resistant groove 10. When it is hit, the impact-resistant groove 10 guides the impact stress to be dispersed along the groove wall, and the bottom of the groove is thickened to bear the peak stress.

[0029] Water nozzles 5 are provided at the input and output ends of the corresponding connecting flow channel 20. The water nozzles 5 are welded to the liquid cooling plate 2 and extend into the coolant tank 1b. A metal sealing ring is provided between the water nozzles 5 and the bottom plate of the coolant tank 1b to prevent water leakage. The water nozzles 5 are directly connected to the coolant tank 1b to shorten the flow path length and reduce pipeline pressure loss.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A pumpless electrically driven liquid-cooled battery box device, comprising an integral die-cast box (1), the interior of which is divided into a battery compartment (1a) and a coolant compartment (1b) by a partition (11), and a liquid-cooled plate (2) with an internal flow channel (20) is attached to the bottom of the outer side. Its features are: The inlet section and outlet section of the flow channel (20) are respectively provided with an inlet flexible check valve (3) and an outlet flexible check valve (4), and the inner wall of the flow channel (20) between the two valves is attached with an electroactive polymer (6). The electroactive polymer (6) is connected to an AC power source and generates radial periodic deformation to drive the coolant to flow directionally from the inlet flexible check valve (3) to the outlet flexible check valve (4).

2. The pumpless electrically driven liquid-cooled battery box device according to claim 1, characterized in that: The electroactive polymer (6) is a dielectric elastomer.

3. The pumpless electrically driven liquid-cooled battery box device according to claim 1, characterized in that: The periodic deformation of the electroactive polymer (6) includes: Expansion deformation: When energized, radial expansion compresses the coolant, pushing the outlet flexible check valve (4) to open; Contraction deformation: When the power is off, the elastic contraction generates negative pressure, draws in coolant and opens the inlet flexible check valve (3).

4. The pumpless electrically driven liquid-cooled battery box device according to claim 3, characterized in that: The electroactive polymer (6) is distributed on the sidewall of the flow channel (20), avoiding the top and bottom walls of the flow channel (20).

5. The pumpless electrically driven liquid-cooled battery box device according to claim 4, characterized in that: The inlet flexible check valve (3) or outlet flexible check valve (4) includes a graphene valve plate (41) and a limiting block (42); one end of the graphene valve plate (41) is fixed to the top wall of the flow channel (20); the limiting block (42) corresponds to the free end of the graphene valve plate (41) and is disposed on the bottom wall of the flow channel (20); the graphene valve plate (41) and the bottom wall of the flow channel (20) have an angle.

6. The pumpless electrically driven liquid-cooled battery box device according to claim 5, characterized in that: The graphene valve plate (41) of the inlet flexible check valve (3) is tilted towards the inside of the flow channel (20), and the graphene valve plate (41) of the outlet flexible check valve (4) is tilted towards the outside of the flow channel.

7. The pumpless electrically driven liquid-cooled battery box device according to claim 1, characterized in that: The outer wall of the box (1) is provided with an impact-resistant groove (10).

8. The pumpless electrically driven liquid-cooled battery box device according to claim 1, characterized in that: Water nozzles (5) are provided at the input and output ends of the corresponding connecting channel (20). The water nozzles (5) are welded to the liquid cooling plate (2) and extend into the coolant tank (1b).

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