Lithium battery heat dissipation shell

Abstract

The shell comprises a waterproof layer, a heat conduction column, a heat conduction layer and a heat insulation layer which are sequentially arranged from inside to outside, refrigeration cavities are reserved in the heat insulation layer and the heat conduction layer, and an air pressure detection piece is further arranged above the heat insulation layer on the outermost side; a protective cover is further arranged on the heat insulation layer on the outermost side, and a semiconductor cooler is further arranged between the protective cover and the refrigeration cavity. According to the lithium battery, the heat conduction layer and the heat conduction column are arranged, heat emitted by the lithium battery body is rapidly guided out through the heat conduction layer, the guided-out heat is accumulated in the cavity, and then rapid refrigeration is carried out through the semiconductor cooler, so that the temperature in the cavity is rapidly reduced, the effect of rapidly cooling the lithium battery body is achieved, and the normal temperature of the lithium battery is recovered; the heat dissipation efficiency of the lithium battery is greatly improved, and the heat dissipation effect is obvious.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery manufacturing, in particular to a lithium battery heat dissipation shell. Background Art

[0002] With the development of science and technology, lithium batteries have become mainstream. Lithium batteries can be roughly divided into two categories: lithium metal batteries and lithium ion batteries. Lithium ion batteries do not contain metallic lithium and are rechargeable. The fifth generation of rechargeable batteries, lithium metal batteries, was born in 1996. Their safety, specific capacity, self-discharge rate and performance-price ratio are all better than lithium ion batteries.

[0003] Patent publication number: CN209312822U discloses a lithium battery casing that is easy to dissipate heat. The patent application states: "A large amount of heat will be generated during the use of lithium batteries. Since the internal cells of lithium batteries are in a closed protective environment, the lithium batteries cannot be effectively dissipated. In a high temperature environment, it not only affects the working efficiency of the battery, but also may cause damage to the battery due to excessive internal temperature of the battery, greatly shortening the service life of the lithium battery, thereby reducing the practicality of the existing lithium battery casing." Although the application solves this problem, it has the following defects:

[0004] The above-mentioned prior art solutions have the following defects: although the device can dissipate heat by expanding the overall area of ​​the device, this method has low heat dissipation efficiency and unclear heat dissipation effect, and cannot achieve the effect of rapid cooling of the lithium battery. Therefore, we propose a new type of lithium battery heat dissipation shell. Utility Model Content

[0005] The technical problem to be solved by the utility model is how to provide a battery casing with high heat dissipation efficiency.

[0006] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0007] A lithium battery heat dissipation housing, the housing comprising a waterproof layer, a heat-conducting column, a heat-conducting layer and a heat-insulating layer arranged in sequence from the inside to the outside, the heat-insulating layer and the heat-conducting layer reserve a refrigeration cavity, and an air pressure detection component is also arranged above the outermost heat-insulating layer;

[0008] A protective cover is also arranged on the outermost heat insulation layer, and a semiconductor cooler is also arranged between the protective cover and the refrigeration cavity.

[0009] The present application sets a heat-conducting layer and a heat-conducting column, and utilizes the heat-conducting layer to quickly conduct away the heat emitted by the lithium battery body. The conducted heat accumulates inside the cavity, and then is quickly cooled by a semiconductor cooler, so that the temperature inside the cavity is rapidly reduced, thereby achieving the effect of rapidly cooling the lithium battery body, and the lithium battery returns to normal temperature, which greatly improves the heat dissipation efficiency of the lithium battery, and the heat dissipation effect is obvious.

[0010] As a further solution of the utility model: the air pressure detection component includes a rubber pad, an air baffle and an extrusion spring, a groove is opened above the outermost insulation layer, a rubber pad is provided outside the groove, and the air baffle is connected to the two sides of the rubber pad through an extrusion spring.

[0011] As a further solution of the utility model: the rubber pad has a semicircular structure.

[0012] As a further solution of the utility model: the air baffle is located just above the groove and on the inner side of the rubber pad, wherein the air baffle is just in contact with the groove due to the elastic force of the extrusion spring.

[0013] As a further solution of the utility model: a wire protection shell is provided inside the shell, wherein the wire protection shell transversely penetrates the heat insulation layer, the heat conductive layer, the heat conductive column, the waterproof layer and is connected with the battery compartment opened on the inner side of the waterproof layer, and a charging port is provided on the outer side of the wire protection shell.

[0014] As a further solution of the utility model: the PN junction formed by the semiconductor cooler forms a thermocouple to produce a Peltier effect, wherein the cooling end of the semiconductor cooler is arranged in the cavity inside the insulation layer, and the heating end of the semiconductor cooler is arranged outside the insulation layer.

[0015] As a further solution of the utility model: a wire is fixedly connected to the left side of the semiconductor cooler, and one end of the wire is fixedly connected to a DC battery.

[0016] As a further solution of the utility model: a temperature control switch is installed on one side of the heat-conducting layer, and the temperature control switch is connected to the DC battery through a wiring harness.

[0017] As a further solution of the utility model: a plurality of heat-conducting columns are arranged at equal intervals, and the plurality of heat-conducting columns are laid flat between the heat-conducting layer and the waterproof layer.

[0018] As a further solution of the utility model: a lithium battery body is placed in the battery compartment inside the shell.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] The present application sets a heat-conducting layer and a heat-conducting column, and utilizes the heat-conducting layer to quickly conduct away the heat emitted by the lithium battery body. The conducted heat accumulates inside the cavity, and then is quickly cooled by a semiconductor cooler, so that the temperature inside the cavity is rapidly reduced, thereby achieving the effect of rapidly cooling the lithium battery body, and the lithium battery returns to normal temperature, which greatly improves the heat dissipation efficiency of the lithium battery, and the heat dissipation effect is obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a lithium battery heat dissipation housing according to an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the structure of the temperature control switch of the embodiment of the utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the connection between the extrusion spring and the air baffle plate in the embodiment of the utility model;

[0024] Explanation of the reference numerals: 1. lithium battery body; 2. waterproof layer; 3. heat-conducting layer; 4. heat-conducting column; 5. heat-insulating layer; 6. wire protection shell; 7. charging port; 8. temperature control switch; 9. semiconductor cooler; 10. protective cover; 11. wire; 12. DC battery; 13. rubber pad; 14. air baffle; 15. extrusion spring. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in combination with the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] Reference Figure 1 and Figure 3 A lithium battery heat dissipation shell includes a waterproof layer 2, a heat-conducting column 4, a heat-conducting layer 3 and a heat-insulating layer 5 which are arranged in sequence from the inside to the outside. A refrigeration cavity is reserved in the heat-insulating layer 5 and the heat-conducting layer 3. An air pressure detection component is also provided above the outermost heat-insulating layer 5, wherein the air pressure detection component includes a rubber pad 13, an air baffle plate 14 and an extrusion spring 15. A groove is opened above the outermost heat-insulating layer 5, wherein a rubber pad 13 is provided outside the groove, and the inner sides of the rubber pad 13 are connected to the air baffle plate 14 through the extrusion spring 15.

[0027] The outer side of the lithium battery body 1 and the waterproof layer 2 fit tightly with good sealing performance, and the outer side of the waterproof layer 2 and the thermal conductive layer 3 fit tightly, wherein a cavity with good sealing performance is opened between the thermal conductive layer 3 and the thermal insulation layer 5, and the thermal insulation layer 5 isolates the outside air from entering the cavity, and the thermal conductive layer 3 can quickly conduct the heat emitted by the lithium battery body 1 to the cavity.

[0028] It should be noted that the rubber pad 13 is a semicircular structure, and the air baffle 14 is located just above the groove and inside the rubber pad 13, wherein the air baffle 14 is just in contact with the groove due to the elastic force of the extrusion spring 15. Here, the air plate 14 and the extrusion spring 15 constitute a simple one-way valve, wherein the semicircular rubber plug 13 is rotatably connected just above the air baffle 14, and the air pressure in the cavity inside the heat insulation layer 5 can be observed through the semicircular rubber plug 13. When the temperature in the cavity is high, the pressure is high, which will stretch the air baffle 14 to expand the semicircular rubber plug 13. When the pressure is low, under the action of the air baffle 14, the external hot air cannot enter the cavity, and the semicircular rubber plug 13 has no obvious changes.

[0029] Reference Figure 1 A wire protection shell 6 is provided inside the shell, wherein the wire protection shell 6 transversely penetrates the heat insulation layer 5, the heat conductive layer 3, the heat conductive column 4, and the waterproof layer 2 and is connected with the battery compartment opened on the inner side of the waterproof layer 2, and a charging port 7 is provided on the outer side of the wire protection shell 6. A lithium battery body 1 is placed in the battery compartment inside the shell, wherein a plurality of heat conductive columns 4 are arranged at equal intervals, and a plurality of heat conductive columns 4 are laid flat between the heat conductive layer 3 and the waterproof layer 2, and the heat conductive columns 4 are in contact with the inner and outer walls of the heat conductive layer 3, so that the heat conduction speed of the lithium battery body 1 is accelerated through the heat conductive columns 4.

[0030] It should be noted that a charging cable is arranged inside the wire protection shell 6, one end of the charging cable is fixedly connected to the lithium battery body 1, and the other end of the charging cable is fixedly connected to the charging port 7. The charging cable is protected by the wire protection shell 6 so that it will not be affected by the external temperature and change.

[0031] Reference Figure 1 and Figure 2A protective cover 10 is also provided on the outermost insulation layer 5, wherein a semiconductor cooler 9 is also provided between the protective cover 10 and the refrigeration cavity, and the PN junction formed by the semiconductor cooler 9 forms a thermocouple pair to produce a Peltier effect, wherein the cooling end of the semiconductor cooler 9 is arranged in the cavity inside the insulation layer 5, and the heating end of the semiconductor cooler 9 is arranged outside the insulation layer 5, and the outer side of the heating end is threadedly connected with the protective cover 10, and the semiconductor cooler 9 is used to quickly cool down to achieve a heat absorption effect, and the protective cover 10 can effectively prevent the heating end of the semiconductor cooler 9 from being scalded. A wire 11 is also connected to one side of the semiconductor cooler 9, and one end of the wire 11 is fixedly connected to a DC battery 12 and a temperature control switch 8, and the temperature control switch 8 is electrically connected to the semiconductor cooler 9 and the DC battery 12.

[0032] The specific operating principle of the present application is as follows: when the lithium battery body 1 is working, the heat emitted first passes through the waterproof layer 2 and reaches the heat conductive layer 3. The heat conductive column 4 inside the heat conductive layer 3 will accelerate the conduction of heat, so that the heat emitted by the lithium battery body 1 is quickly dissipated, and the heat will accumulate inside the cavity. When the temperature control switch 8 detects that the temperature inside the cavity rises to a preset temperature, power is turned on to form a pathway, the DC battery 12 discharges, the semiconductor cooler 9 starts to work, and the refrigeration end quickly cools down, achieving a rapid cooling effect on the internal temperature, so that the lithium battery body 1 is quickly cooled. When it returns to normal temperature, the temperature control switch 8 disconnects the circuit, and the semiconductor cooler 9 no longer cools, which is convenient for maintaining the normal operation of the lithium battery and reducing the occurrence of safety accidents. The heat insulating layer 5 is relatively sealed, isolating the external heat from entering the cavity, and the semicircular rubber plug 13 needs to be opened regularly to replace the internal air, so as to maintain the internal and external pressure balance.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lithium battery heat dissipation housing, characterized in that: The shell comprises a waterproof layer (2), a heat-conducting column (4), a heat-conducting layer (3) and a heat-insulating layer (5) which are arranged in sequence from the inside to the outside, the heat-insulating layer (5) and the heat-conducting layer (3) reserve a refrigeration cavity, and an air pressure detection component is also arranged above the outermost heat-insulating layer (5); A protective cover (10) is also provided on the outermost heat insulation layer (5), wherein a semiconductor cooler (9) is also provided between the protective cover (10) and the refrigeration cavity.

2. A lithium battery heat dissipation housing according to claim 1, characterized in that: The air pressure detection component comprises a rubber pad (13), an air baffle plate (14) and a compression spring (15), wherein a groove is formed above the outermost heat insulation layer (5), wherein the rubber pad (13) is arranged outside the groove, and the air baffle plates (14) are connected to the two sides of the rubber pad (13) via the compression spring (15).

3. A lithium battery heat dissipation housing according to claim 2, characterized in that: The rubber pad (13) is in a semicircular structure.

4. A lithium battery heat dissipation housing according to claim 2, characterized in that: The air baffle plate (14) is located just above the groove and on the inner side of the rubber pad (13), wherein the air baffle plate (14) is just in contact with the groove due to the elastic force of the compression spring (15).

5. A lithium battery heat dissipation housing according to claim 1, characterized in that: A wire protection shell (6) is provided inside the shell, wherein the wire protection shell (6) transversely penetrates the heat insulation layer (5), the heat conduction layer (3), the heat conduction column (4), and the waterproof layer (2) and is connected to a battery compartment provided inside the waterproof layer (2), and a charging port (7) is provided outside the wire protection shell (6).

6. A lithium battery heat dissipation housing according to claim 1, characterized in that: The PN junction formed by the semiconductor cooler (9) forms a thermocouple to produce a Peltier effect, wherein the cooling end of the semiconductor cooler (9) is arranged in the cavity inside the thermal insulation layer (5), and the heating end of the semiconductor cooler (9) is arranged outside the thermal insulation layer (5).

7. A lithium battery heat dissipation housing according to claim 1, characterized in that: A wire (11) is fixedly connected to the left side of the semiconductor cooler (9), and one end of the wire (11) is fixedly connected to a DC battery (12).

8. A lithium battery heat dissipation housing according to claim 7, characterized in that: A temperature control switch (8) is installed on one side of the heat-conducting layer (3), and the temperature control switch (8) is electrically connected to a semiconductor cooler (9) and a DC battery (12), wherein the DC battery (12) is arranged outside the housing.

9. The lithium battery heat dissipation housing according to claim 1, characterized in that: A plurality of heat-conducting columns (4) are arranged at equal intervals, and the plurality of heat-conducting columns (4) are laid flat between the heat-conducting layer (3) and the waterproof layer (2).

10. The lithium battery heat dissipation housing according to claim 1, characterized in that: A lithium battery body (1) is placed in the battery compartment inside the shell.

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