阅读说明：本技术 一种专用于锂电池及锂电池箱的热管 (Heat pipe special for lithium battery and lithium battery box ) 是由 张三学 雷政军 翟腾飞 刘毅 郑高锋 于 2021-08-05 设计创作，主要内容包括：本申请公开了一种专用于锂电池及电池箱的热管,包括：壳体、吸附芯、和导热工质,所述导热工质为具有导热性能,且可抑制电池电解液燃烧的介质,所述壳体下端设有释放结构；在温度或压力未超过阈值时,导热工质可以将电池或电池箱内部的温度均衡或传至壳体外的冷却器件上,当电池或电池箱内部温度过高时,热管内的温度和压力也随之增大,当热管温度或压力达到阈值时,所述的释放结构启动,释放出可抑制电池电解液燃烧的介质。(The application discloses heat pipe of lithium cell and battery box is exclusively used in includes: the battery electrolyte adsorption device comprises a shell, an adsorption core and a heat conduction working medium, wherein the heat conduction working medium is a medium which has heat conduction performance and can inhibit the combustion of the battery electrolyte, and a release structure is arranged at the lower end of the shell; when the temperature or the pressure does not exceed the threshold value, the heat conducting working medium can balance or transfer the temperature inside the battery or the battery box to a cooling device outside the shell, when the temperature inside the battery or the battery box is overhigh, the temperature and the pressure inside the heat pipe are increased, and when the temperature or the pressure inside the heat pipe reaches the threshold value, the release structure is started to release a medium capable of inhibiting the combustion of the electrolyte of the battery.)

1. A heat pipe special for a lithium battery and a battery box comprises: the battery electrolyte adsorption device comprises a shell, an adsorption core and a heat conduction working medium, and is characterized in that the heat conduction working medium is a medium which has heat conduction performance and can inhibit the combustion of the battery electrolyte, and a release structure is arranged at the lower end of the shell;

when the temperature or the pressure does not exceed the threshold value, the heat conducting working medium can balance or transfer the temperature inside the battery or the battery box to a cooling device outside the shell, when the temperature inside the battery or the battery box is overhigh, the temperature and the pressure inside the heat pipe are increased, and when the temperature or the pressure inside the heat pipe reaches the threshold value, the release structure is started to release a medium capable of inhibiting the combustion of the electrolyte of the battery.

2. The heat pipe for lithium battery and battery box as claimed in claim 1, wherein the releasing structure is one or more of fusible metal block, explosion venting film, explosion venting valve, and temperature sensing glass ball.

3. The heat pipe of claim 1 wherein the volume of the thermally conductive working medium within the heat pipe is greater than 30% of the internal volume of the heat pipe.

4. A heat pipe for lithium battery and battery box as claimed in claim 3, wherein the heat conducting working medium in the heat pipe is one or more of water, perfluoroketone, pentafluoroethane, difluoromethane, difluoromonochloromonobromomethane, trifluoromonobromomethane, tetrafluorodibromoethane, heptafluoropropane, trifluoromethane, difluorobromomethane, monochloromonobromomethane, difluorodibromomethane, trimethyl phosphate, triphenyl phosphate, and fluorinated phosphite/phosphate.

5. A heat pipe for lithium batteries and battery cases as claimed in claim 1 wherein the wick within the heat pipe is one of a single or multi-layer mesh wick, a sintered powder wick, and an axial channel wick.

6. The heat pipe for lithium batteries and battery cases as claimed in claim 1, wherein the heat pipe case is one of cylindrical, flat or square.

7. A lithium battery comprising a heat pipe according to any one of claims 1-6.

8. A battery case for a lithium battery, characterized in that it comprises a heat pipe according to any one of claims 1-6.

Technical Field

The application relates to the technical field of lithium batteries, in particular to a heat pipe special for a lithium battery and a lithium battery box.

Background

In recent years, lithium battery technology has been rapidly developed and has been used in more and more fields. However, due to the principle and structural characteristics of the lithium battery, the heat generated by internal resistance is often increased during repeated use. If the accumulated heat cannot be effectively dissipated, the stability of the battery in use is affected, and the service life of the lithium battery is shortened. When the temperature is further raised, the electrolyte and the solvent inside can be decomposed, combusted and exploded. In consideration of safety problems, the single body volume of the current lithium battery is very small, and the battery capacity is not too high.

In the current market, aiming at the fire after the thermal runaway of the battery, the main treatment method is the traditional fire extinguishing agent for extinguishing the fire, but the method can only extinguish the fire source outside the battery and cannot extinguish the fire from the internal source of the battery, and the secondary reburning of the battery can be caused when the thermal runaway inside the battery continues.

A heat pipe is a superconductor, generally composed of a shell, a wick and a heat conducting working medium, whose heat conducting capacity exceeds that of any known metal. The working principle is that when one end of the heat pipe is heated, the heat conducting working medium is evaporated and vaporized, the steam flows to the other end under a small pressure difference to release heat and condense into liquid, and the liquid flows back to the evaporation section along the porous material under the action of gravity or capillary force. The circulation is not completed, and the heat is transferred from one end of the heat pipe to the other end, thereby achieving the purpose of heat conduction. Heat pipes in the current market only have a heat conduction function, and a few heat pipes with fire fighting and extinguishing functions are provided.

Patent No. CN111912268A discloses a heat pipe with heat conduction and fire-fighting functions, the bottom of the heat pipe is connected with a container, a heat-conducting fire-fighting medium is stored in the container, a releasing pipe group is arranged on the container, and a valve is arranged on the releasing pipe group. By adopting the structure, heat can be conducted at normal temperature, and when the battery pack is heated due to failure, the medium in the container can be sprayed into the battery pack, so that the purposes of cooling and extinguishing fire are achieved.

Patent No. CN212914289U discloses a battery pack heat pipe device with fire extinguishing and heat conducting functions, which includes a heat pipe set with a heat pipe structure and a medicament container disposed at the lower part of the heat pipe set, and the heat pipe set encloses a flat-bottomed U-shaped space, inside which is a cell slot for placing a cell; the device is still including connecting in the shower nozzle on heat pipe group upper portion to with electric core direct contact, its heat conduction function of electric core normal during operation play, prevent that electric core temperature is too high, when electric core catches fire or when unusual intensification, the inside medicament blowout of the device, in order to realize the fire control function.

In the comparative example, the heat-conducting fire-fighting medium is filled in the container, and when the temperature and the pressure reach certain threshold values, the release pipe group releases fire-fighting substances to achieve the fire-fighting function. However, both solutions have separate media storage containers, and are complicated and not easy to implement.

Disclosure of Invention

In order to solve the technical problem, the technical scheme adopted by the application is as follows:

the application provides a heat pipe of lithium cell and battery box is exclusively used in, includes: the battery electrolyte adsorption device comprises a shell, an adsorption core and a heat conduction working medium, and is characterized in that the heat conduction working medium is a medium which has heat conduction performance and can inhibit the combustion of the battery electrolyte, and a release structure is arranged at the lower end of the shell; when the temperature or the pressure does not exceed the threshold value, the heat conducting working medium can balance or transfer the temperature inside the battery or the battery box to a cooling device outside the shell, when the temperature inside the battery or the battery box is overhigh, the temperature and the pressure inside the heat pipe are increased, and when the temperature or the pressure inside the heat pipe reaches the threshold value, the release structure is started to release a medium capable of inhibiting the combustion of the electrolyte of the battery.

In the embodiments provided in the present application, the release structure is one or more of a fusible metal block, an explosion venting film, an explosion venting valve, and a temperature sensing glass ball.

In the embodiment provided by the application, the volume of the heat conducting working medium in the heat pipe is more than 30% of the internal volume of the heat pipe.

In the embodiments provided herein, the heat conducting working medium in the heat pipe is one or more of water, perfluoroketone, pentafluoroethane, difluoromethane, difluoromonochloromethane, trifluoromonobromomethane, tetrafluorodibromoethane, heptafluoropropane, trifluoromethane, difluorobromomethane, monochloromethane, difluorodibromomethane, trimethyl phosphate, triphenyl phosphate, and fluorinated phosphite/phosphate.

In embodiments provided herein, the wick within the heat pipe is one of a single or multi-layer mesh, a sintered powder wick, and an axially channeled wick.

In embodiments provided herein, the heat pipe housing is one of cylindrical, flat, or square.

The application also provides a lithium battery which comprises the heat pipe.

The application also provides a battery box of a lithium battery, which comprises the heat pipe.

Compared with the prior art, the method has the following beneficial effects:

by utilizing the heat pipe heat conduction principle, the heat conduction working medium with the function of inhibiting the combustion of the electrolyte is added into the cavity of the heat pipe, the heat pipe shell is provided with a heat conduction working medium release structure, and when the temperature or the pressure does not exceed a threshold value, the heat pipe transmits the heat inside the battery cell or the battery box to the outside through the heat conduction working medium in the heat pipe. When the temperature of the battery cell or the battery pack is overhigh, the temperature and the pressure in the heat pipe reach certain threshold values, and the release structure is started and releases the heat conduction working medium with the function of inhibiting the combustion of the electrolyte, so that the fire inside the battery and the battery box is prevented or extinguished.

Additional advantages, objects, and features of the application will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the application.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of a heat pipe with grooves.

FIG. 2 is a schematic view of a heat pipe with a venting membrane.

FIG. 3 is a schematic view of a heat pipe with a fusible alloy mass.

FIG. 4 is a partial schematic view of a heat pipe of the temperature sensitive glass bulb.

Detailed Description

The present application will now be described in further detail with reference to the accompanying drawings, whereby one skilled in the art can, with reference to the description, make an implementation.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

The technical solution of the present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

The application provides a heat pipe of lithium cell and battery box is exclusively used in, includes: the battery electrolyte adsorption device comprises a shell, an adsorption core and a heat conduction working medium, and is characterized in that the heat conduction working medium is a medium which has heat conduction performance and can inhibit the combustion of the battery electrolyte, and a release structure is arranged at the lower end of the shell; when the temperature or the pressure does not exceed the threshold value, the heat conducting working medium can balance or transfer the temperature inside the battery or the battery box to a cooling device outside the shell, when the temperature inside the battery or the battery box is overhigh, the temperature and the pressure inside the heat pipe are increased, and when the temperature or the pressure inside the heat pipe reaches the threshold value, the release structure is started to release a medium capable of inhibiting the combustion of the electrolyte of the battery.

In the embodiments provided by the present application, the release structure is one or more of a notch, a fusible metal block, an explosion venting film, an explosion venting valve, and a temperature sensing glass ball.

In the embodiment provided by the application, the volume of the heat conducting working medium in the heat pipe is more than 30% of the internal volume of the heat pipe.

In the embodiments provided herein, the heat conducting working medium in the heat pipe is one or more of water, perfluoroketone, pentafluoroethane, difluoromethane, difluoromonochloromethane, trifluoromonobromomethane, tetrafluorodibromoethane, heptafluoropropane, trifluoromethane, difluorobromomethane, monochloromethane, difluorodibromomethane, trimethyl phosphate, triphenyl phosphate, and fluorinated phosphite/phosphate.

In embodiments provided herein, the wick within the heat pipe is one of a single or multi-layer mesh, a sintered powder wick, and an axially channeled wick.

In embodiments provided herein, the heat pipe housing is one of cylindrical, flat, or square.

The application also provides a lithium battery which comprises the heat pipe.

The application also provides a battery box of a lithium battery, which comprises the heat pipe.

Example 1

As shown in figure 1, a notch 2 is arranged on a heat pipe 1, the heat pipe 1 is vacuumized, and a heat-conducting working medium is injected, wherein the heat-conducting working medium is fluorine-chlorine-bromine methane. When the battery normally works at ordinary times, the heat generated by the battery is transmitted to the outside by the heat pipe, when the battery is in an abnormal condition or is out of control due to heat, the pressure in the heat pipe is also increased rapidly, and when the battery reaches a threshold value of 0.5MPa, the notch 2 is broken to release the fluorine-chlorine-bromine methane, so that the fire inside the battery is prevented or extinguished.

Example 2

As shown in figure 2, the heat pipe 1 is provided with a venting explosion membrane 3, the heat pipe 1 is vacuumized, and a heat-conducting working medium is injected, wherein the heat-conducting working medium is difluoromethane. When the battery normally works at ordinary times, the heat generated by the battery is transmitted to the outside by the heat pipe, when the battery is in an abnormal condition or is out of control due to heat, the pressure in the heat pipe is also increased rapidly, and when the threshold value is reached to 0.7MPa, the explosion venting film 3 is broken to release difluoromethane, so that the fire inside the battery is prevented or extinguished.

Example 3

As shown in fig. 3, the heat pipe 1 is lined with the fusible alloy block 4, and the fusible alloy 4 is melted at 200 ℃. The heat conducting working medium is a mixture of difluoromethane and pentafluoroethane. When the temperature of the heat pipe reaches 200 ℃, the fusible metal block 9 is melted, and fluoromethane and pentafluoroethane are released.

Example 4

Referring to fig. 4, the square heat pipe 1 is evacuated and filled with a heat conducting working medium, wherein the heat conducting working medium is perfluorohexanone, and the fire extinguishing medium release structure is a temperature sensing glass bulb 5 which can be exploded at 150 ℃. When the battery normally works at ordinary times, the heat generated by the battery is transmitted to the outside by the heat pipe, when the battery is in an abnormal condition or is out of control by heat, the temperature of the heat pipe reaches 150 ℃, the temperature sensing glass bulb 5 is broken, and the fire extinguishing medium perfluorohexanone is released, so that the fire inside the battery is prevented or extinguished.

Although the embodiments of the present application have been disclosed above, they are not limited to the applications listed in the description and the embodiments. It can be applied in all kinds of fields suitable for the present application. Additional modifications will readily occur to those skilled in the art. Therefore, the application is not limited to the specific details and illustrations shown and described herein, without departing from the general concept defined by the claims and their equivalents.