阅读说明：本技术 一种电池最高耐受温度的确定方法 (Method for determining highest tolerance temperature of battery ) 是由 陈新虹 于 2019-12-02 设计创作，主要内容包括：本发明公开了一种电池最高耐受温度的确定方法,包括如下步骤：在预设温度范围内,测得多组待测电池在实验温度K下对应的开路电压OCV值；由每一所述开路电压OCV值获得对应的SOC值；绘制关系曲线SOC％/100h-K；利用SOC％/100h-K计算并绘制出关系线㏑(SOC％/10h)-1/K；由测试温度T开始,每间隔△T,测得所述待测电池在Tn温度下对应对应的SOC值,在测试图中标注点An,重复上述测试,直至获得待测电池的预最高耐受温度Tm；对所述预最高耐受温度Tm进行测试,得最高耐受温度Tmax。通过使用该方法检测出不同电池的最高耐受温度,从而使电池在最高耐受温度下使用,保证其使用的安全性。(The invention discloses a method for determining the highest tolerance temperature of a battery, which comprises the following steps of measuring open-circuit voltage OCV values corresponding to a plurality of groups of batteries to be tested at An experimental temperature K within a preset temperature range, obtaining a corresponding SOC value from each open-circuit voltage OCV value, drawing a relation curve SOC%/100 h-K, calculating and drawing a relation line ㏑ (SOC%/10 h) -1/K by using the SOC%/100 h-K, measuring the corresponding SOC value of the batteries to be tested at a Tn temperature at intervals of △ T from a test temperature T, marking a point An in a test chart, repeating the test until the preset highest tolerance temperature Tm of the batteries to be tested is obtained, testing the preset highest tolerance temperature Tm to obtain the highest tolerance temperature Tmax, and detecting the highest tolerance temperatures of different batteries by using the method, so that the batteries are used at the highest tolerance temperature and the use safety of the batteries is ensured.)

1. A method for determining the maximum temperature endurance of a battery is characterized by comprising the following steps:

measuring open-circuit voltage OCV values corresponding to a plurality of groups of batteries to be tested at an experimental temperature K within a preset temperature range;

obtaining a corresponding SOC value from each open-circuit voltage OCV value by utilizing a standard SOC-OCV curve of the battery to be tested;

drawing a relation curve SOC%/100 h-K between the capacity reduction rate SOC/100h and the experiment temperature K;

calculating and drawing a relation line ㏑ (SOC%/10 h) -1/K between ㏑ (SOC%/10 h) and 1/K by using SOC%/100 h-K;

measuring An open circuit voltage OCV value corresponding to the battery to be tested at the Tn temperature at intervals of △ T from the test temperature T, so as to obtain a corresponding SOC value, marking a point An in a test diagram where a relation line ㏑ (SOC%/10 h) -1/K is located every time one Tn and the corresponding SOC value are obtained, repeating the test until the marked point An deviates from the relation line ㏑ (SOC%/10 h) -1/K, and determining the deviated test temperature corresponding to the marked point An as the highest pre-tolerance temperature Tm of the battery to be tested;

and testing the pre-maximum tolerance temperature Tm to obtain a maximum tolerance temperature Tmax, so that the battery to be tested is used at the maximum tolerance temperature Tmax.

2. The method for determining the maximum withstand temperature of a battery according to claim 1, wherein: the preset temperature range is 10-40 ℃.

3. The method for determining the maximum withstand temperature of a battery according to claim 1, wherein: the specific operation of measuring open-circuit voltage OCV values of a plurality of groups of batteries to be tested at the experiment temperature K within the preset temperature range is as follows: and measuring a group of batteries to be tested at the experiment temperature K corresponding to the OCV value of the open-circuit voltage at the interval specified temperature from the lowest temperature of the preset temperature range.

4. The method for determining the maximum withstand temperature of a battery according to claim 1, wherein: the specific calculation method for calculating and drawing a relation line ㏑ (SOC%/10 h) -1/K between ㏑ (SOC%/10 h) and 1/K by using SOC%/100 h-K is as follows: expressing SOC%/100 h as y and K as x to obtain

5. The method for determining the maximum withstand temperature of a battery according to claim 1, wherein "starting from the test temperature T, △ T intervals" are defined as starting from the test temperature 40 ℃, and Tn is defined as a temperature value at 5 ℃ intervals.

6. The method for determining the maximum withstand temperature of a battery according to claim 1, wherein: the specific operation of testing the pre-maximum tolerance temperature Tm to obtain the maximum tolerance temperature Tmax is as follows: and measuring OCV values of open-circuit voltages corresponding to Tm-2 and Tm-4 to obtain corresponding SOC values, marking the SOC values at points Am-2 and Am-4 in the test chart, observing the relation between marked points An, Am-2 and Am-4 corresponding to Tm, Tm-2 and Tm-4 and a relation line ㏑ (SOC%/10 h) -1/K, and selecting a point which deviates from the relation line ㏑ (SOC%/10 h) -1/K and corresponds to the closest point as the highest tolerance temperature Tmax.

Technical Field

The invention relates to the field of batteries, in particular to a method for determining the highest temperature tolerance of a battery.

Background

The temperature of the battery, that is, the heat generation phenomenon on the surface of the battery due to the chemical, electrochemical change, electron transfer, and material transfer occurring in the internal structure of the battery during use, is a normal phenomenon. However, if the generated heat is not completely dissipated into the environment, the heat may be accumulated inside the battery, and when the temperature is too high, the battery may be irreversibly damaged, thereby failing to operate normally. Therefore, preventing excessive temperature is an important task for battery management in use.

However, due to differences in the formulation, design, manufacturing process, and the like of the batteries, the maximum withstand temperatures of different batteries are greatly different, such as about 50 ℃ for some batteries and about 80 ℃ or higher for some batteries, and it is important to determine the maximum withstand temperatures of different batteries in order to ensure the safety of the batteries.

Disclosure of Invention

The invention aims to provide a method for determining the highest tolerance temperature of a battery, which is used for detecting the highest tolerance temperature of different batteries, so that the battery is used at the highest tolerance temperature, and the use safety of the battery is ensured.

In order to achieve the purpose, the invention adopts the technical scheme that: a method for determining the maximum temperature endurance of a battery comprises the following steps:

measuring open-circuit voltage OCV values corresponding to a plurality of groups of batteries to be tested at an experimental temperature K within a preset temperature range;

obtaining a corresponding SOC value from each open-circuit voltage OCV value by utilizing a standard SOC-OCV curve of the battery to be tested;

drawing a relation curve SOC%/100 h-K between the capacity reduction rate SOC/100h and the experiment temperature K;

calculating and drawing a relation line ㏑ (SOC%/10 h) -1/K between ㏑ (SOC%/10 h) and 1/K by using SOC%/100 h-K;

measuring An open circuit voltage OCV value corresponding to the battery to be tested at the Tn temperature at intervals of △ T from the test temperature T, so as to obtain a corresponding SOC value, marking a point An in a test diagram where a relation line ㏑ (SOC%/10 h) -1/K is located every time one Tn and the corresponding SOC value are obtained, repeating the test until the marked point An deviates from the relation line ㏑ (SOC%/10 h) -1/K, and determining the deviated test temperature corresponding to the marked point An as the highest pre-tolerance temperature Tm of the battery to be tested;

and testing the pre-maximum tolerance temperature Tm to obtain a maximum tolerance temperature Tmax, so that the battery to be tested is used at the maximum tolerance temperature Tmax.

In the technical scheme, the preset temperature range is 10-40 ℃.

In the above technical scheme, "within a preset temperature range, measure the open circuit voltage OCV values corresponding to a plurality of groups of batteries to be tested at an experimental temperature K" its specific operation is: and measuring a group of batteries to be tested at the experiment temperature K corresponding to the OCV value of the open-circuit voltage at the interval specified temperature from the lowest temperature of the preset temperature range.

In the above technical solution, a specific calculation method for calculating and drawing a relation line ㏑ (SOC%/10 h) -1/K between ㏑ (SOC%/10 h) and 1/K by using SOC%/100 h-K includes: expressing SOC%/100 h as y and K as x to obtain Converting it to obtain

Further obtain Thus, a relation line ㏑ (SOC%/10 h) -1/K was obtained.

In the technical scheme, the step of starting from the test temperature T and every interval △ T is specifically that a temperature value Tn is taken from the test temperature of 40 ℃ and every interval of 5 ℃.

In the above technical solution, "testing the pre-highest tolerance temperature Tm to obtain the highest tolerance temperature Tmax" specifically includes: and measuring OCV values of open-circuit voltages corresponding to Tm-2 and Tm-4 to obtain corresponding SOC values, marking the SOC values at points Am-2 and Am-4 in the test chart, observing the relation between marked points An, Am-2 and Am-4 corresponding to Tm, Tm-2 and Tm-4 and a relation line ㏑ (SOC%/10 h) -1/K, and selecting a point which deviates from the relation line ㏑ (SOC%/10 h) -1/K and corresponds to the closest point as the highest tolerance temperature Tmax.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:

1. according to the invention, the main mechanism of the battery aging process is unchanged in the tolerance temperature range, namely, the capacity loss presents the Arrhenius law along with the increase of the temperature, once the battery aging exceeds the tolerance range, the aging in the battery is dominated by a new mechanism, the battery aging does not conform to the original Arrhenius law any more, but is more accelerated, and the maximum tolerance temperature of the battery can be accurately obtained by utilizing the law, so that each battery is fully utilized, the battery works at the respective maximum tolerance temperature, and the use safety of the battery is ensured.

Drawings

FIG. 1 is a graph of the relationship between the SOC/100h and the experiment temperature K according to a first embodiment of the present invention;

FIG. 2 is a relationship line between ㏑ (SOC%/10 h) and 1/K in the first embodiment of the present invention;

FIG. 3 is a schematic diagram of an experiment for verifying the pre-maximum tolerance temperature Tm in the first embodiment of the present invention.

Detailed Description

The invention is further described with reference to the following figures and examples: