CN113937393A - Method for improving heat dissipation of cylindrical lithium ion battery - Google Patents
Method for improving heat dissipation of cylindrical lithium ion battery Download PDFInfo
- Publication number
- CN113937393A CN113937393A CN202111193626.5A CN202111193626A CN113937393A CN 113937393 A CN113937393 A CN 113937393A CN 202111193626 A CN202111193626 A CN 202111193626A CN 113937393 A CN113937393 A CN 113937393A
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- China
- Prior art keywords
- lithium ion
- ion battery
- cylindrical lithium
- heat dissipation
- optimized
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 54
- 230000017525 heat dissipation Effects 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000012360 testing method Methods 0.000 claims abstract description 4
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/643—Cylindrical cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a method for improving the heat dissipation of a cylindrical lithium ion battery, which comprises the following steps: s1, taking a target to be optimized and a value range thereof as test variables, and establishing a curve relation graph between the target to be optimized and the surface area of a cylindrical lithium ion battery; s2, taking a value in a value range of a target to be optimized to obtain a cylindrical lithium ion battery of a corresponding variable, and taking the highest temperature of the cylindrical lithium ion battery of the corresponding variable under the condition of 0.1-5C rate discharge as a standard for evaluating the heat dissipation performance of the cylindrical lithium ion battery, wherein the lower the highest temperature is, the better the heat dissipation performance of the cylindrical lithium ion battery corresponding to the value taking condition is improved. The invention can obviously improve the heat dissipation function of the cylindrical lithium ion battery.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a method for improving heat dissipation of a cylindrical lithium ion battery.
Background
The recent glacier melting in arctic has become a hot topic and the problem of climate warming has again been of concern, especially with the temperature refresh record in antarctica, reaching 18.3 ℃. Along with environmental problems caused by a series of earth temperature rise, all countries adopt active measures to solve the problems, and the gradual control of carbon emission is urgent. Under the background, the new energy automobile industry is rapidly developed, and a wide stage is brought to the lithium battery industry.
However, related safety accidents have not been completely eradicated. Among them, the safety accidents of fire and explosion caused by the failure of the power lithium ion battery are receiving more and more attention from people. The most important reason for the failure of the lithium ion battery is that heat cannot be diffused, thermal runaway is caused, and finally safety accidents occur. Therefore, thermal runaway and thermal diffusion are currently the most spotlighted and urgent safety problems for lithium ion batteries.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for improving the heat dissipation function of a cylindrical lithium ion battery with the highest automation degree.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for improving the heat dissipation of a cylindrical lithium ion battery comprises the following steps:
s1, taking a target to be optimized and a value range thereof as test variables, and establishing a curve relation graph between the target to be optimized and the surface area of a cylindrical lithium ion battery;
s2, taking a value in a value range of a target to be optimized to obtain a cylindrical lithium ion battery of a corresponding variable, and taking the highest temperature of the cylindrical lithium ion battery of the corresponding variable under the discharge of 0.1-5C multiplying power as a standard for evaluating the heat dissipation performance of the cylindrical lithium ion battery, wherein the lower the highest temperature is, the better the heat dissipation performance of the corresponding cylindrical lithium ion battery under the value condition is improved.
Further, the target to be optimized is the height-diameter ratio of the cylindrical lithium ion battery, the height-diameter ratio is the ratio of the height to the diameter of the cylindrical lithium ion battery, and the value range of the height-diameter ratio is 0.2-8.
Further, the prototype of the cylindrical lithium ion battery is selected from one of 18650 models, 21700 models, 26650 models and 26700 models.
Further, the prototype of the cylindrical lithium ion battery is preferably 18650 model.
Further, the height-diameter ratio of the cylindrical lithium ion battery is 0.98.
The larger the specific surface area, the more conducive to heat dissipation. Currently, the major cylindrical lithium ion batteries are 18650, 21700, 26650 and 26700 types. The inventors studied on 18650 model cylindrical lithium ions and found that when the height/diameter ratio (simply referred to as height/diameter ratio) of a battery is smaller, the specific area and volume of the battery are larger, so that the heat dissipation effect of the lithium ion battery can be improved. Experiments prove that under the process steps of discharging at different multiplying powers, the battery with smaller height-diameter ratio has lower surface temperature, and the battery with larger height-diameter ratio has higher surface temperature. From the above results, it was found that the battery pack composed of the battery having a small aspect ratio has an overall temperature lower than that of the battery pack composed of the battery having a large aspect ratio, and the heat dissipation function of the cylindrical lithium ion battery can be effectively improved.
Drawings
FIG. 1 is a schematic diagram of the shape and structure of cylindrical lithium ion batteries with different height-diameter ratios;
fig. 2 is a graph of aspect ratio versus surface area for various batteries prototyped with a 18650 model.
Detailed Description
The present invention will be further described with reference to specific embodiments for making the objects, technical solutions and advantages of the present invention more apparent, but the present invention is not limited to these examples. The methods in the following examples are conventional in the art unless otherwise specified.
The following is a detailed description of specific embodiments of the invention.
A method for improving the heat dissipation of a cylindrical lithium ion battery comprises the following steps:
s1, taking a target to be optimized and a value range thereof as test variables, and establishing a curve relation graph between the target to be optimized and the surface area of a cylindrical lithium ion battery;
s2, taking a value in a value range of a target to be optimized to obtain a cylindrical lithium ion battery of a corresponding variable, and taking the highest temperature of the cylindrical lithium ion battery of the corresponding variable under the discharge of 0.1-5C multiplying power as a standard for evaluating the heat dissipation performance of the cylindrical lithium ion battery, wherein the lower the highest temperature is, the better the heat dissipation performance of the corresponding cylindrical lithium ion battery under the value condition is improved.
The target to be optimized is the height-diameter ratio of the cylindrical lithium ion battery, the height-diameter ratio is the ratio of the height to the diameter of the cylindrical lithium ion battery, and the value range of the height-diameter ratio is 0.2-8.
The prototype of the cylindrical lithium ion battery is selected from 18650 models.
TABLE 1 highest temperature table for batteries with different height-diameter ratios under different rate discharge
In the same way, batteries with other mainstream cylinder models as prototypes also conform to the principle.
In summary, it can be known from verification of cylindrical lithium ion batteries with different height-diameter ratios that the smaller the designed height-diameter ratio of the battery is, the larger the specific surface area and the larger the volume of the battery are, so that the battery can achieve a good heat dissipation function and improve the design capacity of the battery.
The above embodiments are merely preferred embodiments of the present invention, and any simple modification, modification and substitution changes made to the above embodiments according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (5)
1. A method for improving the heat dissipation of a cylindrical lithium ion battery is characterized by comprising the following steps:
s1, taking a target to be optimized and a value range thereof as test variables, and establishing a curve relation graph between the target to be optimized and the surface area of a cylindrical lithium ion battery;
s2, taking a value in a value range of a target to be optimized to obtain a cylindrical lithium ion battery of a corresponding variable, and taking the highest temperature of the cylindrical lithium ion battery of the corresponding variable under the condition of 0.1-5C rate discharge as a standard for evaluating the heat dissipation performance of the cylindrical lithium ion battery, wherein the lower the highest temperature is, the better the heat dissipation performance of the cylindrical lithium ion battery corresponding to the value condition is improved.
2. The method according to claim 1, wherein the target to be optimized is an aspect ratio of the cylindrical lithium ion battery, the aspect ratio is a ratio of a height to a diameter of the cylindrical lithium ion battery, and the aspect ratio ranges from 0.2 to 8.
3. The method of claim 1, wherein the size of the cylindrical lithium ion battery is selected from 18650, 21700, 26650 and 26700.
4. The method for improving the heat dissipation of a cylindrical lithium ion battery as claimed in claim 3, wherein the size of the cylindrical lithium ion battery is 18650.
5. The method of claim 4, wherein the height-diameter ratio of the cylindrical lithium ion battery is 0.98.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111193626.5A CN113937393A (en) | 2021-10-13 | 2021-10-13 | Method for improving heat dissipation of cylindrical lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111193626.5A CN113937393A (en) | 2021-10-13 | 2021-10-13 | Method for improving heat dissipation of cylindrical lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN113937393A true CN113937393A (en) | 2022-01-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111193626.5A Pending CN113937393A (en) | 2021-10-13 | 2021-10-13 | Method for improving heat dissipation of cylindrical lithium ion battery |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108011069A (en) * | 2017-12-01 | 2018-05-08 | 衢州职业技术学院 | The heat management system of power battery and power battery |
| CN110165113A (en) * | 2019-01-09 | 2019-08-23 | 比亚迪股份有限公司 | Power battery pack and electric vehicle |
| CN209418625U (en) * | 2018-12-12 | 2019-09-20 | 上海德朗能动力电池有限公司 | A kind of coiled cylindrical electrodes of lithium-ion batteries structure |
| CN110941911A (en) * | 2019-12-04 | 2020-03-31 | 西南交通大学 | Heat dissipation simulation optimization method of lithium ion battery based on orthogonal test method |
| CN111682255A (en) * | 2020-05-08 | 2020-09-18 | 深圳市鹏诚新能源科技有限公司 | Design method of battery |
-
2021
- 2021-10-13 CN CN202111193626.5A patent/CN113937393A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108011069A (en) * | 2017-12-01 | 2018-05-08 | 衢州职业技术学院 | The heat management system of power battery and power battery |
| CN209418625U (en) * | 2018-12-12 | 2019-09-20 | 上海德朗能动力电池有限公司 | A kind of coiled cylindrical electrodes of lithium-ion batteries structure |
| CN110165113A (en) * | 2019-01-09 | 2019-08-23 | 比亚迪股份有限公司 | Power battery pack and electric vehicle |
| CN110941911A (en) * | 2019-12-04 | 2020-03-31 | 西南交通大学 | Heat dissipation simulation optimization method of lithium ion battery based on orthogonal test method |
| CN111682255A (en) * | 2020-05-08 | 2020-09-18 | 深圳市鹏诚新能源科技有限公司 | Design method of battery |
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