CN109238509B - Temperature acquisition method for lithium battery - Google Patents
Temperature acquisition method for lithium battery Download PDFInfo
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- CN109238509B CN109238509B CN201811072224.8A CN201811072224A CN109238509B CN 109238509 B CN109238509 B CN 109238509B CN 201811072224 A CN201811072224 A CN 201811072224A CN 109238509 B CN109238509 B CN 109238509B
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- temperature
- temperature sensing
- battery
- cap
- lithium battery
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- 238000000034 method Methods 0.000 title claims abstract description 38
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 30
- 239000000523 sample Substances 0.000 claims description 25
- 238000001514 detection method Methods 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 239000003292 glue Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000009783 overcharge test Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
-
- 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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- 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
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a temperature acquisition method of a lithium battery, which comprises a battery, wherein the battery is provided with a cap, the cap comprises a bottom cover and a top cover arranged above the bottom cover, the top cover is provided with an air hole, a temperature sensing line and a temperature recorder are also provided, one end of the temperature sensing line is inserted into the air hole, the temperature recorder is connected with the temperature sensing line, the temperature recorder is used for recording the highest temperature, and the highest temperature is taken as the highest temperature of the cap. The temperature of the battery cap can be monitored, and the operation is simple and convenient.
Description
Technical Field
The invention relates to the technical field of lithium batteries, in particular to a temperature acquisition method of a lithium battery.
Background
During the actual use of the battery, the battery is inevitably short-circuited. When the battery is short-circuited, the temperature outside the battery rapidly rises, burning out the external connection members. Therefore, it is necessary to collect the temperature of the battery in case of a short circuit of the battery to ensure that the external connection member connected to the battery can adapt to the highest temperature of the short circuit of the battery.
In the prior art, a method for collecting the temperature of a battery in a battery short circuit test is to detect the temperature of the side wall of the battery by using a temperature sensing line, and the temperature is used as the highest temperature of the battery short circuit. However, when the short-circuit test is performed, the temperature at the cap of the battery is the highest, and the method cannot judge the temperature at the cap, so that the actual highest temperature of the battery, which is lower than the test result in the short-circuit test, is not beneficial to improving the performance of the battery.
Disclosure of Invention
The invention aims to: the temperature acquisition method of the lithium battery can monitor the temperature of the battery cap and is simple and convenient to operate.
In order to achieve the purpose, the invention adopts the following technical scheme:
the battery is provided with a cap, the cap comprises a bottom cover and a top cover arranged above the bottom cover, an air hole is formed in the top cover, a temperature sensing line and a temperature recorder are further provided, one end of the temperature sensing line is inserted into the air hole, the temperature recorder is connected with the temperature sensing line, the highest temperature is recorded by the temperature recorder, and the highest temperature is used as the highest temperature of the cap.
As an optimal technical scheme of the temperature collection method for the lithium battery, the temperature sensing line comprises a temperature detection end, a connection line body and a connection end connected with the temperature recorder, the connection line body is respectively connected with the temperature detection end and the connection end, the temperature detection end is provided with a temperature sensing probe, and the temperature sensing probe is inserted into the air hole.
As a preferable technical solution of the temperature collection method for a lithium battery, the temperature sensing probe is inserted into a gap between the top cover and the bottom cover.
As a preferable technical solution of the temperature collection method for a lithium battery, the temperature sensing probe is abutted against one side of the top cover close to the bottom cover.
As a preferable technical solution of the temperature collection method for a lithium battery, the temperature sensing line is detachably connected to the battery through a fixing member.
As a preferable technical solution of the temperature collection method for a lithium battery, the fixing member is a high temperature adhesive.
As an optimal technical scheme of the temperature acquisition method of the lithium battery, the fixing part is a clamping groove arranged on the connecting wire body, and part of the side wall of the air hole is selectively clamped with the clamping groove.
As a preferable aspect of the method for collecting a temperature of a lithium battery, the connecting wire body is wound around a peripheral portion of the top cover.
As a preferable technical scheme of the temperature collection method for the lithium battery, the length of the temperature sensing line is 2.0m, and the length of the temperature sensing probe is 0.02 m.
As a preferable technical solution of the temperature collection method for a lithium battery, the provided battery includes a plurality of groups, one end of each temperature sensing line is correspondingly inserted into the air hole of each group of the battery, the temperature recorder records the maximum temperature of each temperature sensing line, and calculates an average value of all the maximum temperatures to obtain the maximum temperature of the cap.
The invention has the beneficial effects that: according to the temperature acquisition method of the lithium battery, when the battery short circuit test is carried out, the temperature of the cap is acquired by inserting the temperature sensing line into the air hole formed in the top cover, the highest temperature acquired by the temperature sensing line is recorded by the temperature recorder, and the highest temperature of the cap during the battery short circuit test is further obtained. The highest cap temperature of the battery is obtained by the method, so that the safety performance of the battery is improved and the design of the battery is improved. And selecting the material of the external connecting part connected with the cap according to the obtained highest temperature of the cap so as to prevent the external connecting part from being burnt out at high temperature.
Drawings
The invention is explained in more detail below with reference to the figures and examples.
Fig. 1 is a schematic connection diagram of temperature sensing lines in temperature acquisition of a lithium battery short circuit test according to an embodiment.
In the figure:
1. a top cover; 2. air holes; 3. a connecting wire body; 4. a connecting end; 5. a temperature recorder.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
As shown in fig. 1, the present invention provides a temperature acquisition method for a lithium battery, and provides a battery, wherein the battery has a cap, the cap includes a bottom cover and a top cover 1 disposed above the bottom cover, the bottom cover is provided with an explosion valve, and the top cover 1 is provided with an air hole 2. In the method, a temperature sensing wire and a temperature recorder 5 are also provided, one end of the temperature sensing wire is inserted into the air hole 2 in the case of short circuit of the battery or in the case of overcharge of the battery, the temperature recorder 5 is connected with the temperature sensing wire, and the highest temperature is recorded by the temperature recorder 5 and is taken as the cap highest temperature.
The explosion valve arranged on the bottom cover can be exploded when the battery is in short circuit or overcharged, and gas and heat in the battery are discharged by the aeration valve, so that high temperature is generated at the cover cap. The cap having a high temperature easily burns out an external connection member connected to the cap, thereby causing damage to the electronic device. According to the temperature acquisition method of the lithium battery, when the battery short circuit test is carried out, the temperature of the cap is acquired by inserting the temperature sensing line into the air hole 2 formed in the top cover 1, the highest temperature acquired by the temperature sensing line is recorded by the temperature recorder 5, and the highest temperature of the cap during the battery short circuit test is further obtained. The highest cap temperature of the battery is obtained by the method, so that the safety performance of the battery is improved and the design of the battery is improved. And selecting the material of the external connecting part connected with the cap according to the obtained highest temperature of the cap so as to prevent the external connecting part from being burnt out at high temperature. By the method, the temperature of the cap can be conveniently acquired, the resistance in the battery is not increased, and the operation is convenient.
Specifically, the length of time that the temperature sensing line is kept in the air hole 2 is at least 5min, so that the heat in the battery can be transmitted to the cap as far as possible, the highest temperature of the cap can be read in the temperature recorder 5, and the cap is guaranteed to reach the highest temperature before the temperature sensing line is drawn out of the air hole.
The temperature sensing line comprises a temperature detection end, a connecting line body 3 and a connecting end 4 connected with the temperature recorder 5, the connecting line body 3 is respectively connected with the temperature detection end and the connecting end 4, the temperature detection end is provided with a temperature sensing probe, and the temperature sensing probe is inserted into the air hole 2. Because the back is exploded to the blasting valve on the bottom when the battery short circuit, the inside heat of battery is mainly from gas pocket 2 discharge, utilizes the temperature-sensing probe to insert can improve the accuracy of gathering in the gas pocket 2.
In this embodiment, the temperature sensing probe is inserted into the gap between the top cover 1 and the bottom cover, and the temperature of the discharged exhaust gas is directly monitored by using the temperature sensing probe, so that the influence of external factors on temperature acquisition is reduced. Under the normal condition, at least one air hole 2 on the top cover is arranged opposite to the safety valve of the bottom cover, preferably, a temperature sensing line is inserted into the air hole 2 opposite to the safety valve, so that the waste gas in the battery is directly discharged from the air hole 2 after passing through the safety valve, in the process, the temperature sensing probe is directly contacted with the waste gas, the temperature is collected before the heat in the waste gas is excessively dissipated, and the accuracy of temperature collection is improved.
In a preferred embodiment, the temperature sensing probe abuts against a side of the top cover 1 close to the bottom cover. When actual use, top cap 1 is direct and external connection part contact or is connected under most of the circumstances, is connected temperature-sensing probe and top cap 1 one side near the bottom for temperature-sensing probe can directly monitor the temperature of top cap 1, and top cap 1 is close to one side of bottom and receives external factors's influence less, is connected temperature-sensing probe and top cap 1 one side near the bottom, can improve measuring accuracy.
In order to prevent the temperature sensing wire from being separated from the air hole 2 when the temperature is collected, the temperature sensing wire is fixed with the battery through a fixing part, and the temperature sensing wire is fixed on the battery through the fixing part, so that the operability of the temperature collecting method of the lithium battery is improved.
In this embodiment, the fixing component is made of high-temperature glue, and the temperature sensing line is detachably connected with the top cover 1 through the high-temperature glue. Utilize high temperature to glue can with the temperature sensing line temporary fixation on top cap 1, prevent that the in-process that the temperature sensing line was used from taking place to remove and influence the collection of temperature, after the operation finishes, can tear the high temperature and glue and demolish the temperature sensing line from top cap 1, carry out used repeatedly to the temperature sensing line. And because the high-temperature glue has the characteristic of high temperature resistance, the temperature sensing line can be prevented from falling off from the air hole 2 due to high-temperature burning of the high-temperature glue in the operation process, and the operability of the temperature collection method of the lithium battery is improved. Preferably, the high-temperature adhesive is a high-temperature adhesive tape. In other embodiments, the fixing component can also be a clamping groove formed in the connecting wire body 3, part of the side wall of the air hole 2 can be selectively clamped in the clamping groove, and the fixing of the temperature sensing wire is realized through clamping of the clamping groove and the side wall of the air hole 2. In other embodiments, the temperature sensing wire can be fastened to the battery through a fastening component.
As a preferred embodiment, the connecting wire body 3 is wound around the periphery of the top cover 1, and the connecting wire body 3 is directly wound around the periphery of the top cover 1, so that an additional fixing member is not required to fix the temperature sensing wire.
In this embodiment, the length of the temperature sensing line is 2.0m, and the length of the temperature sensing probe is 0.02 m. However, in other embodiments, the lengths of the temperature sensing wire and the temperature sensing probe may be selected according to actual needs, and the lengths of the temperature sensing wire and the temperature sensing probe are not particularly limited herein.
Preferably, the cross section of the temperature sensing probe is adapted to the shape of the air vent 2, for example, the cross section of the temperature sensing probe and the cross section of the air vent 2 are both circular, or the cross section of the temperature sensing probe and the cross section of the air vent 2 are both rectangular, etc.
In order to ensure that the air hole 2 can discharge the waste gas in the battery when the temperature is collected, a certain gap is formed between the side walls of the air hole 2 by the temperature sensing line, so that the air hole 2 is prevented from being completely blocked by the temperature sensing line, and the battery is prevented from exploding.
As another preferred embodiment, a plurality of sets of the batteries are provided, one end of each temperature sensing line is correspondingly inserted into the air hole 2 of each set of the batteries, the temperature recorder records the maximum temperature of each temperature sensing line, and calculates the average value of all the maximum temperatures to obtain the maximum temperature of the cap. Through the design, the measurement error of the highest temperature of the cap can be reduced as much as possible, and the accuracy of temperature acquisition is improved. Wherein, each group of the batteries are of the same type and the same batch so as to ensure that the batteries of each group are completely the same.
The temperature acquisition method of the lithium battery is suitable for temperature acquisition of a battery cap for over-charge test besides the battery short circuit test.
In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are based on the orientations and positional relationships shown in the drawings and are used for convenience in description and simplicity in operation, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular operation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single technical solution, and such description is for clarity only, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that may be understood by those skilled in the art.
The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.
Claims (8)
1. A temperature acquisition method of a lithium battery is provided, the battery is provided with a cap, the cap comprises a bottom cover and a top cover arranged above the bottom cover, the top cover is provided with an air hole, the temperature acquisition method is characterized in that a temperature sensing line and a temperature recorder are further provided, one end of the temperature sensing line is inserted into the air hole, the temperature recorder is connected with the temperature sensing line, the temperature recorder is used for recording the highest temperature which is taken as the highest temperature of the cap, the temperature sensing line is kept in the air hole for at least 5min, a gap is formed between the temperature sensing line and the side wall of the air hole, the temperature sensing line comprises a temperature detection end, a connecting line body and a connecting end connected with the temperature recorder, the connecting line body is respectively connected with the temperature detection end and the connecting end, and the temperature detection end is provided with a temperature sensing probe, the temperature sensing probe is inserted into the air hole and is abutted against one side, close to the bottom cover, of the top cover.
2. The method for collecting temperature of a lithium battery as claimed in claim 1, wherein the temperature sensing probe is inserted into a gap between the top cap and the bottom cap.
3. The method for collecting temperature of a lithium battery as claimed in claim 1, wherein the temperature sensing wire is detachably connected to the battery through a fixing member.
4. The method for collecting temperature of a lithium battery as claimed in claim 3, wherein the fixing member is a high temperature adhesive.
5. The temperature collection method of the lithium battery as claimed in claim 3, wherein the fixing member is a clamping groove provided on the connecting wire body, and a part of the side wall of the air hole is selectively clamped with the clamping groove.
6. The method for collecting temperature of a lithium battery as claimed in claim 4, wherein the connection wire body is wound around a peripheral portion of the top cover.
7. The method for collecting the temperature of the lithium battery as claimed in claim 1, wherein the length of the temperature sensing line is 2.0m, and the length of the temperature sensing probe is 0.02 m.
8. The method for collecting temperature of a lithium battery as claimed in any one of claims 1 to 7, wherein the battery is provided in a plurality of sets, one end of each of the temperature sensing lines is inserted into the air hole of each set of the battery, and the temperature recorder records the maximum temperature of each temperature sensing line and calculates an average of all the maximum temperatures to obtain the maximum temperature of the cap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811072224.8A CN109238509B (en) | 2018-09-14 | 2018-09-14 | Temperature acquisition method for lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811072224.8A CN109238509B (en) | 2018-09-14 | 2018-09-14 | Temperature acquisition method for lithium battery |
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| CN109238509A CN109238509A (en) | 2019-01-18 |
| CN109238509B true CN109238509B (en) | 2021-07-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0158845B1 (en) * | 1995-07-28 | 1999-02-18 | 배순훈 | An over-load preventing device of lithium battery |
| CN104734295B (en) * | 2015-03-30 | 2017-01-18 | 航天东方红卫星有限公司 | Control method for constant-current constant-voltage charging of lithium storage battery |
| CN105742740B (en) * | 2016-02-24 | 2018-08-17 | 宁德时代新能源科技股份有限公司 | Temperature measuring structure of lithium ion battery |
| CN108181019A (en) * | 2018-01-15 | 2018-06-19 | 惠州亿纬锂能股份有限公司 | A kind of test method of battery overcharge maximum temperature |
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