Liquid cooling and phase change composite heat dissipation bionic flow channel liquid cooling plate for battery pack

Abstract

The utility model relates to the technical field of thermal management of lithium ion batteries, and provides a liquid cooling and phase change composite radiating bionic flow channel liquid cooling plate for a battery pack, which comprises a substrate and a cover plate, the substrate and the cover plate are made of metal materials with good thermal conductivity, the substrate is provided with a liquid inlet flow channel, a liquid outlet flow channel, a main flow channel, an arc-shaped flow channel and a filling cavity, the liquid inlet flow channel and the liquid outlet flow channel are arranged on the base plate, the main flow channel is linear and is connected with the liquid inlet flow channel and the liquid outlet flow channel, the arc-shaped flow channels are arranged on the two sides of the main flow channel, the two ends of each arc-shaped flow channel are communicated with the two ends of the main flow channel, a plurality of filling cavities are formed between the main flow channel and the arc-shaped flow channels, and the filling cavities are filled with phase change materials. The phase change temperature of the phase change material is 40-53 DEG C. The substrate and the cover plate are sealed and fixedly connected. Compared with a traditional liquid cooling structure, the heat dissipation structure combines an active heat dissipation mode and a passive heat dissipation mode, the pump power is reduced, and meanwhile the heat dissipation performance is improved.

Description

Technical Field

[0001] The utility model relates to a power battery thermal management system of an electric vehicle, in particular to a bionic flow channel liquid cooling plate with liquid cooling and phase change composite heat dissipation for a battery pack. Background Art

[0002] At present, in the thermal management of electric vehicle power batteries, liquid cooling is the main heat dissipation measure for battery modules. The heat generated by battery charging and discharging is taken away by cooling water flowing in the cold plate flow channel. Liquid cooling is an active way to absorb heat from the battery pack. As the energy density of the battery increases, the single liquid cooling method needs to increase the heat dissipation area for better heat dissipation, which will greatly increase the flow resistance and thus increase the pump power consumption. Otherwise, it is difficult to meet the heat dissipation requirements of the battery module.

[0003] Phase change material cooling is a passive heat absorption. In practical applications, phase change material heat dissipation technology has the advantages of no additional system energy consumption, simple structure, easy maintenance, fewer moving parts and rigid connectors, and excellent heat dissipation effect. However, phase change materials also have the problem of cooling failure after absorbing heat and melting.

[0004] Therefore, it is necessary to develop a composite bionic heat dissipation structure that combines active heat absorption and passive heat absorption, and adopts phase change materials and liquid cooling to improve heat dissipation performance and reduce pump power. Summary of the invention

[0005] The utility model provides a bionic flow channel liquid cooling plate with liquid cooling and phase change composite heat dissipation for a battery pack, so as to solve the problem that the existing liquid cooling needs to increase the heat dissipation area for heat dissipation, but increases the resistance and pump power consumption, and the phase change material has the problem of cooling failure caused by heat absorption and melting.

[0006] In order to solve the technical problem, the utility model adopts the following technical scheme: a bionic flow channel liquid cooling plate with liquid cooling and phase change composite heat dissipation for a battery pack, the liquid cooling plate comprising a substrate and a cover plate, the substrate and the cover plate are made of metal materials with good thermal conductivity, the substrate is provided with a liquid inlet flow channel, a liquid outlet flow channel, a main flow channel, an arc flow channel and a filling cavity, the liquid inlet flow channel and the liquid outlet flow channel are arranged on the substrate, the main flow channel is straight and connects the liquid inlet flow channel and the liquid outlet flow channel, the arc flow channel is arranged on both sides of the main flow channel, the two ends of the arc flow channel are connected with the two ends of the main flow channel, a plurality of filling cavities are arranged between the main flow channel and the arc flow channel, the filling cavity is filled with phase change material, the phase change temperature of the phase change material is 40-53°C, the substrate and the cover plate are sealed and fixedly connected.

[0007] Furthermore, a plurality of primary flow channels are symmetrically arranged between the two sides of the main flow channel and the arc flow channel, a plurality of filling cavities are arranged on the substrate local area between the main flow channel, the arc flow channel and the primary flow channel, and phase change materials are respectively filled in the filling cavities.

[0008] Furthermore, the phase change material adopts phase change paraffin; and after further optimization, the phase change temperature of the phase change paraffin is 42°C, 44°C or 46°C.

[0009] Furthermore, the base plate and the cover plate are both made of aluminum alloy material, and the liquid inlet channel, liquid outlet channel, main channel, arc channel, primary channel and filling cavity arranged on the base plate are formed on the base plate by stamping.

[0010] Furthermore, the base plate and the cover plate are connected as one body by friction stir welding to achieve sealing and fixation.

[0011] Furthermore, the main flow channel, the curved flow channel and the primary flow channel on the substrate form a blade bionic structure, the multiple filling cavities are not connected to the main flow channel, the curved flow channel and the primary flow channel, and a phase change material cooling method is adopted.

[0012] Furthermore, the main flow channel, the arc flow channel and the primary flow channel are cooled by liquid.

[0013] Furthermore, the liquid cooling coolant is an ethylene glycol aqueous solution.

[0014] The beneficial effects of the utility model are as follows: the utility model arranges liquid-cooling material and phase-change material in the flow channel arranged on the liquid-cooling plate, and the battery pack can be effectively cooled by the combination of the liquid-cooling material and the phase-change material. The main flow channel, the arc flow channel and the primary flow channel are cooled by liquid cooling, and the filling cavity is cooled by the phase-change material. The flow channel and the filling cavity on the liquid-cooling plate adopt the bionic structure of blade veins, which can effectively exchange heat between the liquid-cooling material and the phase-change material when the battery is heated. When the liquid-cooling material cools down, the phase-change material can effectively solve the problem of cooling failure caused by heat absorption and melting under the action of the liquid-cooling material. At the same time, the phase-change material is arranged in the middle of the flow channel, which can reduce the temperature difference, reduce the flow resistance of the liquid-cooling material, and flow smoothly, thereby effectively reducing the problem of pump power consumption. Compared with the traditional liquid-cooling structure, the utility model combines active and passive heat dissipation methods to improve the heat dissipation performance while reducing the pump power. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 It is a schematic diagram of the flow channel of the utility model;

[0017] Figure 3 It is a schematic diagram of the installation structure of the utility model.

[0018] In the figure: 1. battery, 2. liquid cooling plate, 21. cover plate, 22. base plate, 22I. liquid inlet channel, 22O. liquid outlet channel, 22M. main channel, 22A. primary channel, 22B. filling cavity, 22P. arc channel. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0020] refer to Figures 1 to 3 A bionic flow channel liquid cooling plate with liquid cooling and phase change composite heat dissipation for a battery pack, the liquid cooling plate comprises a substrate 22 and a cover plate 21, the substrate 22 and the cover plate 21 are made of metal materials with good thermal conductivity, the substrate 22 is provided with a liquid inlet channel 22I, a liquid outlet channel 22O, a main channel 22M, an arcuate channel 22P and a filling cavity 22B, the liquid inlet channel 22I and the liquid outlet channel 22O are arranged on the substrate 22, the main channel 22M is linear and connects the liquid inlet channel 22I and the liquid outlet channel 22O, the arcuate channel 22P is arranged on both sides of the main channel 22M, and the two ends of the arcuate channel 22P are connected to the main channel 22 The two ends of M are connected, and a plurality of filling cavities 22B are arranged between the main channel 22M and the arc flow channel 22P. The filling cavity 22B is filled with a phase change material. The phase change temperature of the phase change material is 40-53°C. In this embodiment, the phase change material is phase change paraffin. The substrate 22 and the cover plate 21 are sealed and fixedly connected; the side of the battery 1 and the side of the liquid cooling plate 2 are bonded and adhered by a heat-conducting structural adhesive.

[0021] refer to Figure 2 A plurality of primary flow channels 22A are symmetrically arranged on both sides of the main flow channel 22M and between the arc flow channel 22P, and a plurality of filling cavities 22B are arranged on the substrate 22 local area between the main flow channel 22M, the arc flow channel 22P, and the primary flow channel 22A, and phase change materials are respectively filled in the filling cavities 22B.

[0022] Further, refer to Figure 1 to Figure 2 The substrate 22 and the cover plate 21 are both made of aluminum alloy material. The liquid inlet channel 22I, the liquid outlet channel 22O, the main channel 22M, the arc channel 22P, the primary channel 22A and the filling cavity 22B arranged on the substrate 22 are all formed by stamping on the substrate 22; the substrate 22 is made of aluminum alloy material with material number Al6061 and is formed by machining, and the cover plate 21 is made of aluminum alloy material with material number Al6061 and is formed by machining. The thickness of the cover plate 21 is a flat plate in the range of 1mm-1.5mm.

[0023] Further, refer to Figure 1 The base plate 22 and the cover plate 21 are connected together by friction stir welding to achieve sealing and fixing.

[0024] Further, refer to Figure 2 , the main channel 22M, the curved channel 22P, and the primary channel 22A on the substrate 22 form a blade bionic structure, and the multiple filling cavities 22B are not connected to the main channel 22M, the curved channel 22P, and the primary channel 22A, and a phase change material cooling method is adopted.

[0025] Furthermore, the main flow channel 22M, the arc flow channel 22P, and the primary flow channel 22A are cooled by liquid.

[0026] In the utility model, the phase change temperature of the phase change paraffin is 42°C, 44°C or 46°C. For example, an existing phase change paraffin manufacturer has defined the product models of phase change paraffin, specifically, the phase change paraffin model PCM-A-42 (phase change temperature is 42°C), PCM-A-44H (phase change temperature is 44°C) or PCM-A-46 (phase change temperature is 46°C).

[0027] Innovation points of this utility model patent:

[0028] 1. The flow channel structure of bionic leaves is adopted to reduce the flow channel resistance and pump power under the same heat dissipation effect;

[0029] 2. By combining active and passive heat absorption, phase change materials are arranged in the middle of the battery to reduce temperature differences, improve temperature uniformity and heat dissipation effects.

[0030] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation modes. The above-mentioned specific implementation modes are merely illustrative and not restrictive. Under the guidance of the present application, technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A bionic channel liquid cooling plate with liquid cooling and phase change composite heat dissipation for a battery pack, characterized in that: The liquid cooling plate includes a base plate and a cover plate. The base plate and the cover plate are made of metal materials with good thermal conductivity. The base plate is provided with a liquid inlet channel, a liquid outlet channel, a main channel, an arc channel and a filling cavity. The liquid inlet channel and the liquid outlet channel are arranged on the base plate. The main channel is straight and connects the liquid inlet channel and the liquid outlet channel. The arc channel is arranged on both sides of the main channel. Both ends of the arc channel are connected with both ends of the main channel. A plurality of filling cavities are arranged between the main channel and the arc channel. The filling cavity is filled with a phase change material. The phase change temperature of the phase change material is 40-53°C. The base plate and the cover plate are sealed and fixedly connected.

2. The bionic flow channel liquid cooling plate with liquid cooling and phase change composite heat dissipation for battery pack according to claim 1, characterized in that: A plurality of primary flow channels are symmetrically arranged between the two sides of the main flow channel and the arc flow channel, a plurality of filling cavities are arranged on the substrate local area between the main flow channel, the arc flow channel and the primary flow channel, and phase change materials are respectively filled in the filling cavities.

3. A bionic flow channel liquid cooling plate with liquid cooling and phase change composite heat dissipation for a battery pack according to claim 1 or 2, characterized in that: The phase change material is phase change paraffin.

4. The bionic flow channel liquid cooling plate with liquid cooling and phase change composite heat dissipation for battery pack according to claim 3, characterized in that: The phase change temperature of the phase change paraffin is 42°C, 44°C or 46°C.

5. The bionic flow channel liquid cooling plate with liquid cooling and phase change composite heat dissipation for battery pack according to claim 2, characterized in that: The base plate and the cover plate are both made of aluminum alloy material. The liquid inlet flow channel, liquid outlet flow channel, main flow channel, arc flow channel, primary flow channel and filling cavity arranged on the base plate are formed on the base plate by stamping.

6. The bionic flow channel liquid cooling plate with liquid cooling and phase change composite heat dissipation for battery pack according to claim 1, characterized in that: The base plate and the cover plate are connected as one body by friction stir welding to achieve sealing and fixing.

7. The bionic flow channel liquid cooling plate with liquid cooling and phase change composite heat dissipation for battery pack according to claim 2, characterized in that: The main flow channel, the curved flow channel and the primary flow channel on the substrate form a blade bionic structure, the multiple filling cavities are not connected to the main flow channel, the curved flow channel and the primary flow channel, and a phase change material cooling method is adopted.

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