Lithium battery thermal management device based on dry water cooling

Abstract

The invention relates to a lithium battery thermal management device based on dry water cooling, which comprises a shell with an opening in the top and an inner cavity formed in the shell; a cover plate; the heat dissipation parts are arranged in parallel and provided with heat dissipation cavities, the heat dissipation parts are arranged in the inner cavity, and the heat dissipation cavities of the heat dissipation parts are used for placing lithium batteries; the two liquid storage bags are arranged on the two sides in the inner cavity and located on the two sides of the multiple heat dissipation parts, each liquid storage bag makes contact with the side face of the corresponding heat dissipation part, and the two liquid storage bags and the heat dissipation parts are connected in series through hoses; dry water is filled in the two liquid storage bags and an interlayer of the heat dissipation part; the multiple heat dissipation parts and the two liquid storage bags are connected in series through hoses, dry water is stored in the liquid storage bags and the heat dissipation parts, and the lithium battery is arranged in the heat dissipation parts and exchanges heat with the lithium battery through the dry water; the liquid storage bag is in contact with the heat dissipation part, the liquid storage bag plays a buffering role, and the lithium battery is prevented from being damaged; according to the scheme, flowing of the cooling medium is achieved through acceleration or deceleration of the automobile, and cooling of the lithium battery is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium batteries, and in particular to a lithium battery thermal management device based on dry water cooling. Background Art

[0002] As people develop various new energy sources in the automotive field, traditional gasoline vehicles are impacted, and electric vehicles are increasingly popular among the population. As one of the important battery packs for electric vehicles, lithium batteries are highly favored due to their advantages such as high energy density and low self-discharge rate.

[0003] In the existing process of heat dissipation of lithium batteries, water cooling plates are often used to achieve heat dissipation of the batteries. However, during the heat dissipation process, additional power is often required to drive the circulation of the cooling medium to complete the heat exchange of the cooling medium.

[0004] In summary, how to achieve circulating cooling by allowing the cooling medium to move with the car has become an urgent problem that researchers in this field need to solve. Summary of the invention

[0005] The technical problem to be solved by the present invention is: how to realize circulating cooling by the movement of the cooling medium following the movement of the vehicle;

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] The present invention is a thermal management device for lithium batteries based on dry water cooling, comprising: a shell with an opening at the top, in which an inner cavity is opened; a cover plate, which is suitable for covering the opening at the top of the shell; a plurality of heat dissipation parts arranged in parallel and having heat dissipation chambers, which are arranged in the inner cavity, and the heat dissipation chambers are used to place lithium batteries; and two liquid storage capsules, which are arranged on both sides of the inner cavity and located on both sides of the plurality of heat dissipation parts, each of the liquid storage capsules is in contact with the side surface of the corresponding heat dissipation part, wherein the two liquid storage capsules and the heat dissipation part are connected in series through a hose; the two liquid storage capsules and the interlayer of the heat dissipation part are filled with dry water;

[0008] In this solution, multiple heat dissipation parts and two liquid storage capsules are connected in series through a hose. Dry water is stored in the liquid storage capsule and the heat dissipation part. The lithium battery is placed in the heat dissipation part, and heat exchange is performed with the lithium battery through the dry water. The liquid storage capsule is in contact with the heat dissipation part, and the liquid storage capsule plays a buffering role to prevent damage to the lithium battery.

[0009] For example, when a car is accelerating, the lithium battery remains relatively still in the thermal management device, the liquid storage bag on the rear side of the movement direction is squeezed with the heat dissipation part, and the liquid storage bag on the front side of the movement direction is slightly away from the heat dissipation part, so that the dry water flows from the back to the front to participate in cooling;

[0010] In summary, this solution utilizes the acceleration or deceleration of the car to achieve the flow of cooling medium and realize the cooling of the lithium battery.

[0011] In order to further improve the cooling effect, the present invention adopts a honeycomb structure in the interlayer of the heat dissipation part;

[0012] In this way, when the dry water flows in the heat dissipation part, the dry water surface has a honeycomb texture, which can not only improve the convective heat transfer coefficient of the dry water, but also increase the flow path of the dry water and improve the heat dissipation effect.

[0013] In order to prevent the heat dissipation parts from colliding with each other, the present invention adopts a plurality of positioning columns arranged in the inner cavity of the shell, and two adjacent heat dissipation parts are in contact with each other through the positioning columns;

[0014] Two adjacent heat dissipation parts are spaced apart by the positioning part, thereby avoiding collision between the heat dissipation parts.

[0015] In order to further improve the cooling efficiency, the present invention adopts a graphene plate disposed between the positioning column and the heat dissipation part;

[0016] A graphene plate is arranged between the positioning column and the heat dissipation part to solve the problem that the heat dissipation performance decreases when the temperature of dry water inside the heat dissipation plate rises due to heat absorption.

[0017] In order to explain the specific structure of the heat dissipation part, the heat dissipation part adopted in the present invention includes: a heat dissipation substrate composed of a side wall and a bottom wall, the inner side of which is provided with a positioning groove; and a heat dissipation plate, both sides of which are provided with positioning protrusions that cooperate with the positioning groove;

[0018] In this solution, the position for inserting the heat sink is determined according to the length of the lithium battery, the heat sink is inserted into the heat sink substrate, and the lithium battery is placed in the space surrounded by the heat sink and the heat sink substrate.

[0019] In order to improve the cooling of the lithium battery, the present invention adopts a honeycomb structure in the interlayer of the heat dissipation substrate and the heat dissipation plate, and the heat dissipation substrate and the heat dissipation plate are connected by a quick-connect plug;

[0020] In this solution, the heat dissipation substrate and the heat dissipation plate can be filled with dry water, which can achieve five-sided cooling of the lithium battery and improve the cooling efficiency of the lithium battery.

[0021] How to adjust the size of the extrusion force between the heat dissipation part and the liquid storage bag, the present invention adopts that the two sides of the shell have accommodating cavities corresponding to the liquid storage bags; an extrusion plate is arranged between the liquid storage bag and the side wall of the accommodating cavity; an adjusting member is threadedly connected to the shell, and its end passes through the shell and is movably connected to the extrusion plate;

[0022] In complex road conditions with more sudden acceleration, the adjusting part is turned to move the extrusion plate away from the liquid storage bag, so that sufficient heat exchange of dry water can be achieved; in high-speed road conditions with less sudden acceleration, the adjusting part is turned to move the extrusion plate close to the liquid storage bag, which can also achieve sufficient heat exchange of dry water.

[0023] When the vehicle is traveling at a constant speed, the liquid storage bag will not be squeezed. In order to achieve the heat dissipation of the device, the present invention adopts an air inlet at the bottom of the shell; a heat dissipation fan is arranged at the bottom of the heat dissipation part, and the heat dissipation fan is located at the air inlet; an air outlet is arranged on the cover plate; a pressure plate is suitable for covering the air outlet; a rotating seat is arranged on the cover plate; a connecting plate, the middle part of which is hinged with the rotating seat, one end of which is connected to the pressure plate, and a first elastic member is arranged between the other end and the cover plate;

[0024] In this solution, when the vehicle is traveling at a constant speed, the heat dissipation fan allows gas to flow into the air inlet and be discharged from the air outlet, thereby achieving air cooling of the heat dissipation part. The airflow can overcome the force of the first elastic member to separate the pressure plate from the air outlet, thereby achieving a one-way circulation of air cooling.

[0025] In order to prevent the heat dissipation part from hitting the shell during the driving of the vehicle, the heat dissipation part near the side wall of the shell is connected to the inner side wall of the shell through a second elastic member;

[0026] In this solution, the second elastic member plays a buffering role to prevent the heat dissipation part from impacting the shell and causing deformation.

[0027] Beneficial effects of the present invention: The present invention is a thermal management device for lithium batteries based on dry water cooling, wherein a plurality of heat dissipation parts and two liquid storage capsules are connected in series via a hose, dry water is stored in the liquid storage capsule and the heat dissipation part, the lithium battery is placed in the heat dissipation part, and heat exchange is performed with the lithium battery through the dry water; the liquid storage capsule is in contact with the heat dissipation part, and the liquid storage capsule plays a buffering role to avoid damage to the lithium battery, and more importantly, the cooling medium passively flows in the heat dissipation part while buffering, thereby achieving a good cooling effect; this solution utilizes the acceleration or deceleration of the automobile to realize the flow of the cooling medium, thereby achieving cooling of the lithium battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0029] Figure 1 It is a schematic diagram of the bottom structure of the present invention;

[0030] Figure 2 It is a schematic diagram of the structure of the present invention in which the housing and the cover plate are omitted;

[0031] Figure 3 is a cross-sectional view of the present invention;

[0032] Figure 4 is a cross-sectional view of the heat dissipation section;

[0033] Figure 5 Schematic diagram of the top structure of the cover plate;

[0034] Figure 6 Schematic diagram of the bottom structure of the cover plate;

[0035] In the figure: 1-shell, 11-accommodating cavity, 12-air inlet, 13-heat dissipation fan, 2-cover plate, 21-air outlet, 22-pressing plate, 23-rotating seat, 24-connecting plate, 25-first elastic member, 26-second elastic member, 3-heat dissipation part, 31-honeycomb structure, 32-heat dissipation substrate, 33-heat dissipation plate, 4-liquid storage capsule, 5-hose, 6-positioning column, 7-extrusion plate, 8-adjusting member. DETAILED DESCRIPTION

[0036] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0037] like Figure 1-6 As shown, the present invention is a thermal management device for lithium batteries based on dry water cooling, comprising: a shell 1 with an opening on the top, in which an inner cavity is opened; a cover plate 2, which is suitable for covering the top opening of the shell 1; a plurality of heat dissipation parts 3 arranged in parallel and having heat dissipation chambers, which are arranged in the inner cavity, and the heat dissipation chambers are used to place lithium batteries; and two liquid storage capsules 4, which are arranged on both sides of the inner cavity and located on both sides of the plurality of heat dissipation parts 3, each of the liquid storage capsules 4 is in contact with the side surface of the corresponding heat dissipation part 3, wherein the two liquid storage capsules 4 and the heat dissipation part 3 are connected in series through a hose 5; the two liquid storage capsules 4 and the interlayer of the heat dissipation part 3 are filled with dry water;

[0038] In this solution, multiple heat dissipation parts and two liquid storage capsules are connected in series through a hose. Dry water is stored in the liquid storage capsule and the heat dissipation part. The lithium battery is placed in the heat dissipation part, and heat exchange is performed with the lithium battery through the dry water. The liquid storage capsule is in contact with the heat dissipation part, and the liquid storage capsule plays a buffering role to prevent damage to the lithium battery.

[0039] For example, when a car is accelerating, the lithium battery remains relatively still in the thermal management device, the liquid storage bag on the rear side of the movement direction is squeezed with the heat dissipation part, and the liquid storage bag on the front side of the movement direction is slightly away from the heat dissipation part, so that the dry water flows from the back to the front to participate in cooling;

[0040] In summary, this solution utilizes the acceleration or deceleration of the car to achieve the flow of cooling medium and realize the cooling of the lithium battery.

[0041] like Figure 4As shown, in order to further improve the cooling effect, the present invention adopts a honeycomb structure 31 in the interlayer of the heat dissipation part 3;

[0042] In this way, when the dry water flows in the heat dissipation part, the dry water surface has a honeycomb texture, which can not only improve the convective heat transfer coefficient of the dry water, but also increase the flow path of the dry water and improve the heat dissipation effect.

[0043] like Figure 3 As shown, in order to prevent the heat dissipation parts from colliding with each other, the present invention adopts a plurality of positioning posts 6 disposed in the inner cavity of the housing 1, and two adjacent heat dissipation parts 3 are in contact with each other through the positioning posts 6;

[0044] Two adjacent heat dissipation parts are spaced apart by the positioning part, thereby avoiding collision between the heat dissipation parts.

[0045] In order to further improve the cooling efficiency, the present invention adopts a graphene plate disposed between the positioning column 6 and the heat dissipation portion 3;

[0046] A graphene plate is arranged between the positioning column and the heat dissipation part to solve the problem that the heat dissipation performance decreases when the temperature of dry water inside the heat dissipation plate rises due to heat absorption.

[0047] like Figure 3 As shown, in order to illustrate the specific structure of the heat dissipation part, the heat dissipation part 3 adopted in the present invention includes: a heat dissipation substrate 32 composed of a side wall and a bottom wall, the inner side of which is provided with a positioning groove; and a heat dissipation plate 33, both sides of which are provided with positioning protrusions that cooperate with the positioning groove;

[0048] In this solution, the position for inserting the heat sink is determined according to the length of the lithium battery, the heat sink is inserted into the heat sink substrate, and the lithium battery is placed in the space surrounded by the heat sink and the heat sink substrate.

[0049] In order to improve the cooling of the lithium battery, the present invention adopts a honeycomb structure in the interlayer of the heat dissipation substrate 32 and the heat dissipation plate 33, and the heat dissipation substrate 32 and the heat dissipation plate 33 are connected by a quick-connect plug;

[0050] In this solution, the heat dissipation substrate and the heat dissipation plate can be filled with dry water, and the quick-connect plug can realize the circulation of dry water, which can realize five-sided cooling of the lithium battery and improve the cooling efficiency of the lithium battery.

[0051] like Figure 3 As shown, how to adjust the size of the extrusion force between the heat dissipation part and the liquid storage capsule, the present invention adopts that the two sides of the shell 1 have accommodating cavities 11 corresponding to the liquid storage capsule 4; an extrusion plate 7 is arranged between the liquid storage capsule 4 and the side wall of the accommodating cavity 11; an adjusting member 8, which is threadedly connected to the shell 1, and its end passes through the shell 1 and is movably connected to the extrusion plate 7;

[0052] In complex road conditions with more sudden acceleration, the adjusting part is turned to move the extrusion plate away from the liquid storage bag, so that sufficient heat exchange of dry water can be achieved; in high-speed road conditions with less sudden acceleration, the adjusting part is turned to move the extrusion plate close to the liquid storage bag, which can also achieve sufficient heat exchange of dry water.

[0053] like Figure 1 , 3 As shown in , 5 and 6, when the vehicle is traveling at a constant speed, the liquid storage capsule will not be squeezed. In order to achieve the heat dissipation of the device, the present invention adopts an air inlet 12 at the bottom of the shell 1; a heat dissipation fan 13 is provided at the bottom of the heat dissipation part 3, and the heat dissipation fan 13 is located at the air inlet 12; an air outlet 21 is provided on the cover plate 2; a pressure plate 22, which is suitable for covering the air outlet 21; a rotating seat 23, which is arranged on the cover plate 2; a connecting plate 24, the middle part of which is hinged with the rotating seat 23, one end of which is connected to the pressure plate 22, and a first elastic member 25 is provided between the other end and the cover plate 2;

[0054] In this solution, when the vehicle is traveling at a constant speed, the heat dissipation fan allows gas to flow into the air inlet and be discharged from the air outlet, thereby achieving air cooling of the heat dissipation part. The airflow can overcome the force of the first elastic member to separate the pressure plate from the air outlet, thereby achieving a one-way circulation of air cooling.

[0055] like Figure 3 As shown, in order to prevent the heat dissipation part from hitting the shell during the driving of the vehicle, the present invention adopts a second elastic member 26 to connect the heat dissipation part 3 near the side wall of the shell 1 and the inner wall of the shell 1;

[0056] In this solution, the second elastic member plays a buffering role to prevent the heat dissipation part from impacting the shell and causing deformation.

[0057] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A thermal management device for lithium batteries based on dry water cooling, characterized in that: include: A shell body with an opening at the top and an inner cavity therein; A cover plate, which is suitable for covering the top opening of the shell; A plurality of heat dissipation parts arranged in parallel and having heat dissipation chambers are arranged in the inner cavity, and the heat dissipation chambers are used to place lithium batteries; and two liquid storage bags, which are arranged on both sides of the inner cavity and located on both sides of the plurality of heat dissipation parts, each of the liquid storage bags is in contact with the side surface of the corresponding heat dissipation part, wherein the two liquid storage bags and the heat dissipation parts are connected in series through a hose; The two liquid storage bags and the interlayer of the heat dissipation part are filled with dry water.

2. A thermal management device for lithium batteries based on dry water cooling according to claim 1, characterized in that: The interlayer of the heat dissipation part is a honeycomb structure.

3. A lithium battery thermal management device based on dry water cooling according to claim 1, characterized in that: A plurality of positioning columns are arranged in the inner cavity of the shell, and two adjacent heat dissipation parts are in contact with each other through the positioning columns.

4. A dry water cooling lithium battery thermal management device according to claim 3, characterized in that: A graphene plate is arranged between the positioning column and the heat dissipation part.

5. A thermal management device for lithium batteries based on dry water cooling according to claim 1, characterized in that: The heat dissipation unit comprises: A heat dissipation substrate composed of a side wall and a bottom wall, with a positioning groove formed on its inner side; And a heat sink, both sides of which are provided with positioning protrusions that match the positioning grooves.

6. A lithium battery thermal management device based on dry water cooling according to claim 5, characterized in that: The interlayers of the heat dissipation substrate and the heat dissipation plate both have honeycomb structures, and the heat dissipation substrate and the heat dissipation plate are connected via a quick-connect plug.

7. A thermal management device for lithium batteries based on dry water cooling according to claim 1, characterized in that: Both sides of the shell have accommodating cavities for placing the corresponding liquid storage capsules; An extrusion plate is provided between the liquid storage capsule and the side wall of the accommodating cavity; An adjusting member is threadedly connected to the shell, and an end portion thereof passes through the shell and is movably connected to the extrusion plate.

8. The thermal management device for lithium batteries based on dry water cooling according to claim 1, characterized in that: An air inlet is provided at the bottom of the shell; A heat dissipation fan is provided at the bottom of the heat dissipation part, and the heat dissipation fan is located at the air inlet; The cover plate is provided with an air outlet; A pressure plate, which is suitable for covering the air outlet; A rotating seat, which is arranged on the cover plate; The connecting plate has a middle portion hinged to the rotating seat, one end of which is connected to the pressing plate, and a first elastic member is arranged between the other end and the cover plate.

9. A lithium battery thermal management device based on dry water cooling according to claim 1, characterized in that: The heat dissipation portion close to the side wall of the shell is connected to the inner wall of the shell through a second elastic member.

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