A battery thermal management device based on composite heat dissipation material and liquid cooling

Abstract

The present application discloses a battery thermal management device based on composite heat dissipation materials and liquid cooling, including a composite heat dissipation component and a liquid cooling component; the composite heat dissipation component includes a composite heat dissipation body and a potting glue layer; the composite heat dissipation body is provided with a plurality of heat conduction holes for embedding single cells; the potting glue layer is attached to the outer wall of the composite material body; the liquid cooling component includes a liquid cooling plate and a coolant supply box; the liquid cooling plate is embedded in the potting glue layer; the coolant supply box is connected to the liquid cooling plate, and is used to circulate coolant to the liquid cooling plate. The present application sets a plurality of heat conduction holes for embedding single cells on the composite heat dissipation component, and quickly draws away the heat of the composite heat dissipation component through convection heat transfer by the coolant in the liquid cooling plate, so as to achieve the effects of temperature equalization, temperature control and secondary heat dissipation, and finally can control the temperature difference and maximum temperature of different batteries in the battery module within a reasonable working range, with a compact overall structure and high cooling efficiency.

Description

Technical Field

[0001] The present application relates to the technical field of thermal management of battery power systems, and in particular to a battery thermal management device based on composite heat dissipation materials and liquid cooling. Background Art

[0002] Electric vehicles are vehicles that use electricity as a power source and convert it into mechanical energy through a controller and an electric motor. The power batteries of existing electric vehicles are generally lithium batteries that are connected in series and parallel to form a high-power, high-capacity lithium battery pack. During operation, problems such as uneven heat distribution and different life spans of different single cells are prone to occur inside the power battery, resulting in the attenuation of the capacity and life span of the lithium battery pack, and even a sharp increase in the internal temperature and loss of control. Summary of the invention

[0003] In view of this, the purpose of this application is to provide a battery thermal management device based on composite heat dissipation materials and liquid cooling, which can solve the problems of poor heat dissipation and poor temperature uniformity of power batteries.

[0004] In order to achieve the above technical objectives, the present application provides a battery thermal management device based on composite heat dissipation materials and liquid cooling, including a composite heat dissipation component and a liquid cooling component;

[0005] The composite heat dissipation component comprises a composite heat dissipation body and a potting glue layer;

[0006] The composite heat dissipation body is provided with a plurality of heat conduction holes for embedding single cells;

[0007] The potting glue layer is attached to the outer side wall of the composite material body;

[0008] The liquid cooling assembly includes a liquid cooling plate and a cooling liquid supply tank;

[0009] The liquid cooling plate is embedded in the potting glue layer;

[0010] The cooling liquid supply tank is connected to the liquid cooling plate and is used for circulating and supplying cooling liquid to the liquid cooling plate.

[0011] Preferably, the composite heat dissipation body is formed by coupling foam copper and potting glue.

[0012] Preferably, the potting glue layer and the potting glue are both made of modified potting glue containing 1.5% by mass of expanded graphite.

[0013] Preferably, the composite heat dissipation body is in a rectangular block structure;

[0014] The plurality of heat conducting holes are arranged in a uniform matrix;

[0015] The potting adhesive layer is attached to two symmetrical outer side walls of the composite heat dissipation body, and the liquid cooling plate is embedded in the two potting adhesive layers.

[0016] Preferably, the coolant supply tank includes a circulation pump;

[0017] The circulation pump outlet is connected to the liquid outlet of the coolant supply tank.

[0018] Preferably, the liquid cooling plate has two flow cavities extending vertically through the liquid cooling plate along its length direction;

[0019] The two flow cavity openings located on one end surface of the liquid cooling plate are respectively connected with the liquid outlet and the liquid return port of the cooling liquid supply tank through a first hose;

[0020] The two flow cavity openings located on the other end surface of the liquid cooling plate are connected through a second hose.

[0021] Preferably, the normal cross section of the flow cavity along the coolant flow direction is square;

[0022] The first hose and the second hose are both round tubes;

[0023] The liquid cooling plate is connected to the first hose and the second hose via a square-circle reducer interface.

[0024] Preferably, each of the heat-conducting holes is coated with thermally conductive silicone grease that contacts the single battery cells.

[0025] Preferably, it also includes a housing;

[0026] The composite heat dissipation component and the liquid cooling component are arranged in the housing;

[0027] A buffer pad is arranged inside the shell.

[0028] The present application also provides a new energy vehicle, characterized in that it includes a battery thermal management device based on composite heat dissipation material and liquid cooling as described in any of the above items.

[0029] It can be seen from the above technical solutions that the present application can timely absorb the heat generated by the battery by setting a plurality of heat-conducting holes for embedding single cells on the composite heat dissipation body; and setting a liquid cooling plate on the outer wall of the composite heat dissipation body. The coolant in the liquid cooling plate quickly draws away the heat through convection heat transfer, thereby achieving the effects of temperature uniformity, temperature control and secondary heat dissipation. Ultimately, the temperature difference and maximum temperature of different batteries in the battery module can be controlled within a reasonable working range, with a compact overall structure and high cooling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 A schematic diagram of the structure of a battery thermal management device based on composite heat dissipation material and liquid cooling provided in this application;

[0032] Figure 2 A cross-sectional view of a battery thermal management device based on a composite heat dissipation material and liquid cooling provided in this application;

[0033] In the figure: 1. Single battery; 2. Composite heat dissipation body; 3. Square and round reducer; 4. Liquid cooling plate; 5. Shell; 6. Coolant supply tank; 7. Potting glue layer. DETAILED DESCRIPTION

[0034] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of them. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection of the embodiments of the present application.

[0035] In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a replaceable connection, or an integral connection, it can be a mechanical connection, it can be an electrical connection, it can be a direct connection, it can be indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0037] The embodiment of the present application discloses a battery thermal management device based on a composite heat dissipation material and liquid cooling.

[0038] See also Figure 1 and Figure 2 An embodiment provided in the embodiments of the present application includes: a composite heat dissipation component and a liquid cooling component; the composite heat dissipation component includes a composite heat dissipation body 2 and a potting glue layer 7; the composite heat dissipation body 2 is provided with a plurality of heat conduction holes for embedding single cells 1; the potting glue layer 7 is attached to the outer wall of the composite body 2; the liquid cooling component includes a liquid cooling plate 4 and a cooling liquid supply tank 6; the liquid cooling plate 4 is embedded in the potting glue layer 7; the cooling liquid supply tank 6 is connected to the liquid cooling plate 4, and is used to circulate and supply cooling liquid to the liquid cooling plate 4.

[0039] Since the battery cell 1 generates heat during charging and discharging, in order to achieve uniform temperature and temperature control of the battery cell 1, it is embedded in a composite heat dissipation body 2 with a high thermal conductivity coefficient; in order to further increase the cooling rate and achieve a significant cooling of the battery cell 1, a liquid cooling plate 4 embedded in a potting glue layer 7 is provided in the composite heat dissipation body 2, so that the coolant can circulate in the liquid cooling plate 4; the composite heat dissipation body 2 with high thermal conductivity will conduct the heat to the liquid cooling plate, and then the coolant in the liquid cooling plate 4 will transfer heat by convection, quickly and effectively taking away a large amount of heat from the single battery 1, so that the maximum temperature rise of the single battery 1 is controlled within a reasonable working range of 25°C-50°C, and the maximum temperature difference of the single battery 1 is controlled within 5°C; and since the liquid in the liquid cooling plate 4 does not directly pass through the battery, the risk of liquid leakage is greatly reduced, thereby improving the safety of liquid cooling.

[0040] The above is the first embodiment provided by the embodiment of the present application, and the following is the second embodiment provided by the embodiment of the present application. For details, please refer to Figure 1 to Figure 2 .

[0041] A battery thermal management device based on composite heat dissipation material and liquid cooling, comprising a composite heat dissipation component and a liquid cooling component; the composite heat dissipation component comprises a composite heat dissipation body 2 and a potting glue layer 7; the composite heat dissipation body 2 is provided with a plurality of heat conduction holes for embedding single cells 1; the potting glue layer 7 is attached to the outer side wall of the composite material body 2; the liquid cooling component comprises a liquid cooling plate 4 and a cooling liquid supply tank 6; the liquid cooling plate 4 is embedded in the potting glue layer 7; the cooling liquid supply tank 6 is connected to the liquid cooling plate 4, and is used for circulating cooling liquid to the liquid cooling plate 4.

[0042] Furthermore, the composite heat dissipation body 2 is formed by coupling foam copper and potting glue.

[0043] Specifically, by adding the modified potting glue with expanded graphite to fill the pores of the foam copper, the composite heat dissipation body 2 has excellent thermal conductivity and higher strength to better fix and protect the battery.

[0044] Furthermore, the potting glue layer 7 and the potting glue are both made of modified potting glue containing 1.5% by mass of expanded graphite.

[0045] Specifically, after adding expanded graphite to the potting compound, the thermal conductivity will increase; and it has been verified by experiments that 1.5% by mass of expanded graphite is the best ratio for compounding with the potting compound. If the proportion of expanded graphite is increased further, the viscosity coefficient of the potting compound will increase greatly and it will not be able to be poured into the foam copper.

[0046] Furthermore, the composite heat dissipation body 2 is a rectangular block structure; the plurality of heat-conducting holes are arranged in a uniform matrix; the potting glue layer 7 is specifically two layers, which are attached to two symmetrical outer walls of the composite heat dissipation body 2, and liquid cooling plates 4 are embedded in the two potting glue layers 7.

[0047] Specifically, the composite heat dissipation body 2 may be provided with a potting glue layer 7 on all four side walls and the bottom surface, and each potting glue layer may be correspondingly embedded in a liquid cooling plate, so that the composite heat dissipation body can dissipate heat better.

[0048] Furthermore, the coolant supply tank 6 includes a circulation pump; the outlet of the circulation pump is connected to the liquid outlet of the coolant supply tank 6 .

[0049] Furthermore, two flow cavities distributed up and down are penetrated in the liquid cooling plate 4 along its length direction; the two flow cavity openings located on one end surface of the liquid cooling plate 4 are respectively connected to the liquid outlet and the liquid return port of the coolant supply tank 6 through a first hose; the two flow cavity openings located on the other end surface of the liquid cooling plate 4 are connected through a second hose.

[0050] Specifically, in the present embodiment, there is one coolant supply tank 6. After the coolant enters the circulation pump, it passes through the liquid outlet of the coolant supply tank 6 and the first hose in sequence, flows through the potting glue layer along the length direction of the circulation cavity, enters another circulation cavity through the second hose, and then flows back to the liquid return port of the coolant supply tank 6 through another first hose to complete the circulation of the coolant. In other embodiments, coolant supply tanks 6 can also be provided on both sides of the circulation cavity opening, so that the coolant inside the liquid cooling plate 4 can circulate.

[0051] Furthermore, the cross section of the circulation cavity along the flow direction of the coolant is square, and the square circulation cavity increases the contact area, which is beneficial to heat conduction.

[0052] Furthermore, the first hose and the second hose are both round tubes; the liquid cooling plate is connected to the first hose and the second hose via a square-round reducer interface.

[0053] Specifically, the process of the coolant entering the circulation cavity of the liquid cooling plate 4 from the hose through the square-circle reducer interface undergoes the process of the round tube gradually expanding into a square tube, and the cross-sectional area of ​​the pipe increases, thereby reducing the coolant fluid pressure and flow rate, which is beneficial to the cooling of the coolant; the process of the coolant entering the circulation cavity of the liquid cooling plate 4 from the hose through the square-circle reducer interface undergoes the process of the square tube gradually expanding into a round tube, and the cross-sectional area of ​​the pipe decreases, thereby increasing the flow rate of the coolant in the hose.

[0054] Furthermore, each heat-conducting hole is coated with thermally conductive silicone grease in contact with the single battery, thereby reducing the contact thermal resistance between the single battery 1 and the composite material body 2 .

[0055] Furthermore, it also includes a shell 5; the composite heat dissipation component and the liquid cooling component are arranged in the shell 5; a buffer pad is arranged inside the shell 5 to play an insulating buffering protection role.

[0056] Specifically, the outer shell 5 may include a liquid cooling component and a composite heat dissipation component, or the outer shell 5 may include multiple liquid cooling components and multiple composite heat dissipation components, so that the liquid cooling component can circulate and supply coolant to the composite heat dissipation component to realize convection heat conduction. There is no specific limit on the number of liquid cooling components and composite heat dissipation components included in the outer shell 5.

[0057] Furthermore, multiple single cells are connected in series and / or in parallel, and any of the above-mentioned battery thermal management devices based on composite heat dissipation materials and liquid cooling can be applied to new energy vehicles.

[0058] It should be noted that the above are only preferred embodiments of the present application and are not intended to limit the present invention. Although the present application has been described in detail with reference to the examples, those skilled in the art can still modify the technical solutions recorded in the aforementioned examples or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery thermal management device based on composite heat dissipation material and liquid cooling, characterized in that: Including composite heat dissipation components and liquid cooling components; The composite heat dissipation component comprises a composite heat dissipation body and a potting glue layer; The composite heat dissipation body is provided with a plurality of heat conduction holes for embedding single cells; The composite heat dissipation body is formed by coupling foam copper and potting glue; The composite heat dissipation body is in a rectangular block structure; The plurality of heat conducting holes are arranged in a uniform matrix; The potting adhesive layer is attached to two symmetrical outer side walls of the composite heat dissipation body, and the liquid cooling plate is embedded in the two potting adhesive layers; The potting glue layer and the potting glue are both modified potting glue containing 1.5% by mass of expanded graphite; The liquid cooling assembly includes a liquid cooling plate and a cooling liquid supply tank; The liquid cooling plate is embedded in the potting glue layer; The cooling liquid supply tank is connected to the liquid cooling plate and is used to circulate and supply cooling liquid to the liquid cooling plate; The coolant supply tank is provided with a circulation pump; The outlet of the circulation pump is connected to the outlet of the coolant supply tank; The liquid cooling plate has two flow cavities running through it along its length direction; The two flow cavities are distributed in parallel and at intervals along the width direction of the liquid cooling plate; The two flow cavity openings located on one end surface of the liquid cooling plate are respectively connected with the liquid outlet and the liquid return port of the cooling liquid supply tank through a first hose; The two flow cavity openings located on the other end surface of the liquid cooling plate are connected through a second hose.

2. The battery thermal management device based on composite heat dissipation material and liquid cooling according to claim 1, characterized in that: The cross section of the flow cavity along the flow direction of the coolant is square.

3. The battery thermal management device based on composite heat dissipation material and liquid cooling according to claim 2, characterized in that: The first hose and the second hose are both round tubes; The liquid cooling plate is connected to the first hose and the second hose respectively through a square-circle reducer interface.

4. The battery thermal management device based on composite heat dissipation material and liquid cooling according to claim 1, characterized in that: Each of the heat-conducting holes is coated with heat-conducting silicone grease that contacts the single battery.

5. The battery thermal management device based on composite heat dissipation material and liquid cooling according to claim 1, characterized in that: Also includes a housing; The composite heat dissipation component and the liquid cooling component are arranged in the housing; A buffer pad is arranged inside the shell.

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