Battery thermal management device based on U-shaped heat pipe and liquid cooling

Abstract

The utility model discloses a battery thermal management device based on U-shaped heat pipes and liquid cooling, which comprises square batteries (1), each square battery (1) comprises an electrode top surface, an electrode bottom surface, a long side surface and a short side surface, and a plurality of square batteries (1) are arranged along the thickness direction in a manner that the long side surfaces are adjacent to each other to form a battery module; the U-shaped heat pipes (2) are arranged in gaps of the long side faces of the adjacent square batteries (1) in a staggered mode, each U-shaped heat pipe (2) comprises an evaporation section and a condensation section, the evaporation sections are arranged in the gaps of the long side faces of the adjacent square batteries (1) in a clamped mode, and the condensation sections are located above the top faces of the electrodes and abut against the liquid cooling plate (3); and the two sides of the liquid cooling plate (3) are provided with sheet-shaped heat-conducting sheets with the same number as the batteries, and the sheet-shaped heat-conducting sheets are in complete contact with the short side surfaces of the square batteries (1). According to the heat management device, the efficient heat dissipation of the battery can be realized, the space is fully utilized, and the structure is simple and compact.

Description

TECHNICAL FIELD

[0001] The utility model relates to the battery heat management technical field in energy storage system, especially, relate to a kind of battery heat management device based on U-shaped heat pipe and liquid cooling. BACKGROUND

[0002] The rapid development of new energy vehicles and energy storage field makes the performance and safety of core components-battery be concerned about.In the process of charging and discharging, battery will release a lot of heat, if not properly controlled, not only reduce battery performance and shorten its life, but also may cause security risks.Therefore, battery thermal management technology has become the top priority of industry research.Currently, thermal management technology includes air cooling, liquid cooling, thermoelectric cooling, heat pipe technology and phase change material application and other means.Especially liquid cooling technology, because of its excellent cooling effect, has been widely used in the market.The technology absorbs and releases heat through circulating liquid to cool the battery.The traditional air cooling technology is often difficult to meet the heat dissipation demand in high load scenarios, while the simple liquid cooling technology has high heat exchange efficiency, but in the case of small gap between single body, it may cause complex structure and other problems to achieve ideal heat dissipation effect.

[0003] Heat pipe as a kind of high-efficiency heat conduction element, its internal working medium evaporation heat absorption characteristics can realize high-efficiency heat transfer and other advantages;Liquid cooling through cooling liquid circulation forced heat removal, the combination of the two can further improve the temperature control ability of battery, and make full use of limited space.Therefore, it is necessary to provide a battery cooling device combining heat pipe and liquid cooling.

[0004] In the existing structure combining liquid cooling and heat pipe, most of the structure design is to insert the straight heat pipe directly into the battery, then transfer the heat to the external condensing section, and then use a special cooling system to absorb the heat transferred to the condensing section, which is easy to cause the problem of low space utilization rate.Some designs use a length of evaporation section to absorb the heat of multiple batteries, and at the same time cool the heat pipe and the surface of the battery with liquid cooling, which is easy to cause the temperature difference between the battery far away from the liquid cooling plate and the battery close to the liquid cooling plate, affecting the temperature consistency of the whole battery pack.

[0005] Therefore, it is challenging to reduce the maximum temperature of battery module while maintaining the temperature uniformity of battery module. INVENTION CONTENTS

[0006] The utility model aims at providing a kind of battery heat management device based on U-shaped heat pipe and liquid cooling, which can effectively improve the efficiency and stability of battery heat management, reduce the maximum temperature of battery module while maintaining the temperature uniformity of battery module.

[0007] To achieve the above-mentioned utility model purposes, the utility model provides the following technical scheme:

[0008] A battery thermal management device based on U-shaped heat pipe and liquid cooling, the device comprises:

[0009] Square battery, square battery includes electrode top surface, bottom surface, long side and short side, a plurality of square batteries are arranged along the thickness direction in the long side adjacent mode and constitute battery module;

[0010] U-shaped heat pipe, staggered arrangement is in the long side gap of adjacent square battery, the U-shaped heat pipe includes evaporative section and condensing section, the evaporative section is clamped in the long side gap of adjacent square battery, and the condensing section is located above the electrode top surface and is close to liquid cooling plate;

[0011] Liquid cooling plate, the liquid cooling plate both sides are provided with the same number of sheet-shaped heat conduction sheet with battery and are in complete contact with the short side of square battery.

[0012] The utility model discloses a plurality of heat conduction sheets with the same size of battery thickness are arranged on the both sides of liquid cooling plate and are in complete contact with the side of battery to absorb the heat generated by battery, and the lower side of liquid cooling plate is in contact with the condensing section of U-shaped heat pipe to recover the heat of working medium in heat pipe, working medium evaporates in evaporative section and flows to condensing section to absorb the heat of battery, U-shaped heat pipe and liquid cooling plate absorb the heat generated by battery simultaneously, and liquid cooling plate can also recover the heat at U-shaped heat pipe, and the limited space is reasonably utilized, and the evaporative section of U-shaped heat pipe is arranged between every two square batteries, which is favorable to improve the stability and compactness of battery thermal management.

[0013] Wherein, U-shaped heat pipe contains liquid absorption core inside, condensing section is close to liquid cooling plate, guarantees the maximum area of adhesion with battery and liquid cooling plate, and improves heat transfer efficiency.

[0014] A plurality of rows of U-shaped heat pipes are arranged at equal intervals between adjacent square batteries, and every two adjacent rows of U-shaped heat pipes are arranged to form staggered distribution.

[0015] Each row of U-shaped heat pipes includes 2-6 U-shaped heat pipes, and the number of square batteries is 4-8. Through the above arrangement, it can be flexibly applied in systems with different capacities or cooling requirements.

[0016] The distance between the condensing section of the U-shaped heat pipe and the top of the electrode terminal post of the square battery is at least 10mm, thereby reserving wiring space.

[0017] As preferred, the U-shaped heat pipe is flat, which can increase the contact area with liquid cooling plate and battery and enhance heat exchange effect. In the utility model, the thickness of U-shaped heat pipe is 2-5mm.

[0018] The evaporation section of the U-shaped heat pipe is attached to the battery by heat-conducting glue, and the condensation section of the U-shaped heat pipe is attached to the lower surface of the liquid cooling plate by heat-conducting glue.

[0019] The heat-conducting sheet is in full contact with the short side of the battery through the gasket or the heat-conducting glue.

[0020] The size of the sheet-shaped heat-conducting sheet is consistent with the thickness of the battery.

[0021] The liquid cooling plate is provided with a flow channel, which is a parallel straight flow channel or a serpentine flow channel.

[0022] The flow channel inside the liquid cooling plate can be optimized in shape or arrangement according to the heat dissipation requirement of the battery pack.

[0023] The material of the U-shaped heat pipe is copper or aluminum, the material of the liquid cooling plate is aluminum or aluminum alloy, and the working medium in the U-shaped heat pipe is R134A or acetone.

[0024] Preferably, the liquid cooling plate is made of aluminum to solve the weight problem caused by a large number of heat-conducting sheets.

[0025] The geometric size of the heat pipe and the geometric size of the liquid cooling plate of the battery thermal management device can be adjusted according to different working conditions.

[0026] Compared with the prior art, the battery thermal management device has the following advantages:

[0027] The battery thermal management device based on the U-shaped heat pipe and liquid cooling provided by the utility model realizes rapid and efficient heat transfer and reduces the temperature difference of the battery pack by staggered arrangement of the evaporation section of the U-shaped heat pipe between adjacent square batteries and contact of the condensation section with the liquid cooling plate; the cooling liquid of the liquid cooling plate can take away most of the heat, and the overall heat dissipation efficiency is high in combination with the heat absorption characteristics of the phase change of the working medium in the heat pipe; the structure is relatively compact, the advantages of liquid cooling are retained, and the heat transfer capacity of the U-shaped heat pipe is fully utilized, which is suitable for battery thermal management systems sensitive to volume and weight; and the flow rate of the cooling liquid can be adjusted according to different working conditions of the battery to more effectively dissipate heat of the battery module. Therefore, the device provided by the utility model can effectively improve the efficiency and stability of battery thermal management.

[0028] The battery thermal management device based on the U-shaped heat pipe and liquid cooling provided by the utility model cools the working medium in the condensation section of the heat pipe while the liquid cooling plate contacts the battery side surface through the heat-conducting sheets on both sides of the liquid cooling plate to dissipate heat of the battery. Therefore, the cooperation mode of the heat pipe and the liquid cooling plate of the battery thermal management device provided by the utility model can not only dissipate heat of the battery through liquid cooling and the heat pipe, but also cool the working medium of the heat pipe through liquid cooling, fully utilizes the limited space, and improves the heat dissipation efficiency of the battery.

[0029] The battery thermal management device provided by the utility model compares the single heat pipe heat dissipation thermal management device, heat transfer is more efficient, and the structure is relatively more compact. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a whole structure schematic view of the battery thermal management device based on the U-shaped heat pipe and liquid cooling provided by the utility model;

[0031] Figure 2 It is a structure schematic view of the battery thermal management device based on the U-shaped heat pipe and liquid cooling without liquid cooling plate provided by the utility model;

[0032] Figure 3 It is a matching position schematic view of the U-shaped heat pipe and battery of the battery thermal management device based on the U-shaped heat pipe and liquid cooling provided by the utility model;

[0033] Figure 4 It is a liquid cooling plate schematic view of the battery thermal management device based on the U-shaped heat pipe and liquid cooling provided by the utility model;

[0034] Wherein: 1, square battery, 2, U-shaped heat pipe, 3, liquid cooling plate, 4, flow channel. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0036] Embodiment 1

[0037] As shown in the figure, the battery thermal management device based on the U-shaped heat pipe and liquid cooling provided by the present embodiment comprises: Figures 1-4

[0038] Square battery 1, square battery 1 is arranged in the thickness direction of square battery 1 with a gap slightly larger than the thickness of U-shaped heat pipe 2; square battery 1 comprises electrode top surface, bottom surface, long side surface and short side surface.

[0039] U-shaped heat pipe 2, U-shaped heat pipe 2 is arranged in the gap between the long side surfaces of adjacent square batteries 1, and is attached to square battery 1 through heat-conducting adhesive; the condensation section of U-shaped heat pipe 2 is attached to the lower part of liquid cooling plate 3 through heat-conducting adhesive.

[0040] ​The liquid cooling plate 3 contains a flow channel 4 for circulating cooling liquid inside, and the two sides of the liquid cooling plate 3 are provided with a number of pairs of heat-conducting sheets equal to the number of batteries, and the heat-conducting sheets are attached to the short sides of the square battery 1 through heat-conducting glue for heat conduction.

[0041] Specifically, the U-shaped heat pipe 2 is made of copper material, and contains a liquid absorbing core structure inside for transporting the condensed working medium back to the evaporation section, and the working medium that undergoes phase change inside is R134A; the liquid cooling plate 3 with a plurality of heat-conducting sheet structures is made of aluminum material, and the heat-conducting sheet is connected to the side of the square battery 1 through a heat-conducting gasket.

[0042] In the embodiment, the thickness of the U-shaped heat pipe 2 is 3mm, the working medium inside is R134A, the thickness of the liquid cooling plate 3 is 5mm, the length of the flow channel 4 is 3mm, and the thickness of the heat-conducting sheet on the two sides of the liquid cooling plate 3 is 1mm.

[0043] In the embodiment, four rows of U-shaped heat pipes are arranged along the long side of the square battery 1, each row has two U-shaped heat pipes, and the total number of U-shaped heat pipes is eight; among them, there are two rows of U-shaped heat pipes in the same long side gap, and each row has two U-shaped heat pipes.

[0044] Embodiment 2-3

[0045] Embodiment 2-3 provides a battery thermal management device based on U-shaped heat pipe and liquid cooling, which can refer to embodiment 1, and the difference lies in that the thickness of the U-shaped heat pipe 2 is 4mm and 5mm respectively.

[0046] Embodiment 4-5

[0047] Embodiment 4-5 provides a battery thermal management device based on U-shaped heat pipe and liquid cooling, which can refer to embodiment 1, and the difference lies in that the number of heat pipes at each gap between adjacent batteries is 2 and 6 respectively.

[0048] In summary, the battery thermal management device provided by the utility model has high heat dissipation efficiency, can utilize heat pipes and liquid cooling for double heat dissipation of the battery, and the liquid cooling can also condense the condensation section of the heat pipe. The heat absorbed by the evaporation section of the heat pipe is recycled by the liquid cooling plate at the condensation section, and the special structure of the liquid cooling plate enables the liquid cooling to also exchange heat with the side of the battery. The heat management device combined with the heat pipe and the liquid cooling effectively dissipates heat from the battery, fully retains the advantages of the liquid cooling and the heat pipe, improves the heat dissipation performance of the heat management device, and retains the compact structure advantage.

[0049] Although the disclosed mode of the application is as above, the content is only for the convenience of understanding and the adopted implementation, any person skilled in the art should understand that, without departing from the spirit and scope of the present application disclosed, any modification and change can be made in the form of implementation and details, but the patent protection scope of the present application, still should be limited by the scope defined by the appended claims.

Claims

1. A battery thermal management device based on U-shaped heat pipe and liquid cooling, characterized in that, The device comprises: A square battery (1) comprising an electrode top surface, a bottom surface, a long side and a short side, a plurality of square batteries (1) arranged in the thickness direction in an adjacent manner along the long side to form a battery module; A U-shaped heat pipe (2) arranged in the gap between the long sides of adjacent square batteries (1), the U-shaped heat pipe (2) comprising an evaporation section and a condensation section, the evaporation section being clamped between the long side gaps of adjacent square batteries (1), and the condensation section being located above the electrode top surface and abutting the liquid cooling plate (3); A liquid cooling plate (3) provided with a number of sheet-shaped heat-conducting sheets on both sides equal to the number of square batteries (1) and in complete contact with the short sides of the square batteries (1).

2. The U-shaped heat pipe and liquid-cooled based battery thermal management device according to claim 1, wherein, A plurality of rows of U-shaped heat pipes (2) are arranged at equal intervals between adjacent square batteries (1), and each two adjacent rows of U-shaped heat pipes (2) are arranged to form staggered distribution.

3. The U-shaped heat pipe and liquid-cooled based battery thermal management device according to claim 2, wherein, Each row of U-shaped heat pipes (2) comprises 2-6 U-shaped heat pipes (2), and the number of square batteries (1) is 4-8.

4. The U-tube heat pipe and liquid cooling based battery thermal management device of claim 1, wherein, The distance between the condensation section of the U-shaped heat pipe (2) and the top of the electrode terminal post of the square battery (1) is at least 10 mm.

5. The U-tube heat pipe and liquid cooling based battery thermal management device of claim 1, wherein, The U-shaped heat pipe (2) is flat, with a thickness of 2-5 mm.

6. The U-tube heat pipe and liquid cooling based battery thermal management device of claim 1, wherein, The evaporation section of the U-shaped heat pipe (2) is attached to the square battery (1) by thermal conductive adhesive, and the condensation section of the U-shaped heat pipe (2) is attached to the lower surface of the liquid cooling plate (3) by thermal conductive adhesive.

7. The U-tube heat pipe and liquid cooling based battery thermal management device of claim 1, wherein, The liquid cooling plate (3) is provided with a flow channel (4), which is a parallel straight channel or a serpentine channel.

8. The U-tube heat pipe and liquid cooling based battery thermal management device of claim 1, wherein, The material of the U-shaped heat pipe (2) is copper or aluminum, the material of the liquid cooling plate (3) is aluminum or aluminum alloy, and the working medium in the U-shaped heat pipe (2) is R134A or acetone.

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