CN116819360A

CN116819360A - Method and device for testing condensed water

Info

Publication number: CN116819360A
Application number: CN202311104456.8A
Authority: CN
Inventors: 谷燕龙; 黄嘉玮; 孙占宇; 王鹏; 钟清; 谭目扬
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-08-30
Filing date: 2023-08-30
Publication date: 2023-09-29

Abstract

The embodiment of the application provides a method and a device for testing condensate water, which can effectively test the condensate water preventing capability of a battery with higher accuracy. The method comprises the following steps: determining test parameters for condensate water testing, the test parameters including at least one of the following parameters: the ambient temperature, the ambient humidity, the battery parameters of the battery and the test times of the condensed water test; based on the test parameters, performing the condensed water test on the battery; wherein the ambient temperature comprises at least one of: an upper temperature limit of the ambient temperature, a lower temperature limit of the ambient temperature, a first duration after the ambient temperature reaches the upper temperature limit, a second duration after the ambient temperature reaches the lower temperature limit, and a rate of temperature change of the ambient temperature.

Description

Method and device for testing condensed water

Technical Field

The application relates to the technical field of batteries, in particular to a method and a device for testing condensate water.

Background

Energy conservation and emission reduction are key to sustainable development of the automobile industry. In this case, the electric vehicle is an important component for sustainable development of the automobile industry due to the advantage of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor for development.

With the rapid increase of the usage amount of batteries, the problem of battery condensed water is more and more focused. The condensed water may greatly reduce the insulating property of the battery, and may even cause a local short circuit inside the battery in severe cases.

Disclosure of Invention

The embodiment of the application provides a method and a device for testing condensate water, which can effectively test the condensate water preventing capability of a battery with higher accuracy.

In a first aspect, there is provided a method of condensate testing, the method comprising: determining test parameters for condensate water testing, the test parameters including at least one of the following parameters: the ambient temperature, the ambient humidity, the battery parameters of the battery and the test times of the condensed water test; based on the test parameters, performing the condensed water test on the battery; wherein the ambient temperature comprises at least one of: an upper temperature limit of the ambient temperature, a lower temperature limit of the ambient temperature, a first duration after the ambient temperature reaches the upper temperature limit, a second duration after the ambient temperature reaches the lower temperature limit, and a rate of temperature change of the ambient temperature.

According to the embodiment of the application, the battery is subjected to the condensed water test according to at least one parameter of the environment temperature, the environment humidity, the battery parameter of the battery and the test times of the condensed water test, on one hand, whether the battery generates condensed water or not can be determined, and if no condensed water is generated, the battery has better performance; if condensed water is generated, the battery performance is poor, the battery can be discarded, or measures can be taken to reduce adverse effects of the condensed water on the battery, for example, the ventilation quantity of a battery balance valve is reduced, or a moisture absorption sheet, a desiccant and the like are arranged in the battery, so that the problems of insulation abnormality (serious short circuit ablation), corrosion, sampling abnormality and the like caused by the condensed water are reduced. On the other hand, in the case where the test parameters include a plurality of parameters, the accuracy of the test can be effectively improved relative to the case where the condensed water test is performed on the battery based on one parameter. In still another aspect, the battery is subjected to the condensed water test according to the battery parameters of the battery, so that the condensed water test in the embodiment of the application is a performance test aiming at the battery, and the condensed water prevention capability of the battery can be effectively verified.

Further, because the influence of the ambient temperature on the condensate water test is large, according to the technical scheme, the ambient temperature is subdivided from multiple aspects, namely, the battery is subjected to the condensate water test according to the upper temperature limit, the lower temperature limit, the duration after the upper temperature limit is reached, the duration after the lower temperature limit is reached and the temperature change rate, so that the accuracy of the condensate water test result can be further improved.

In some possible implementations, the ambient temperature includes the upper temperature limit, the battery parameter includes a charging condition, and the charging condition includes charging the battery with a first charging rate after the battery is left for a first period of time if the ambient temperature is at the upper temperature limit; wherein the first charging rate is greater than a rate threshold.

Because insolation quickens and fills and be the most abominable operating mode of battery, therefore, above-mentioned technical scheme is in the condition that temperature is in the upper limit, fills the battery soon, carries out the comdenstion water test to the battery promptly under the most abominable operating mode, has realized the purpose of effectively verifying the anti-condensation water ability of battery under the most abominable operating mode. Further, the battery is kept stand for a first period of time in a high-temperature environment before charging, so that the temperature of the battery can reach balance with the ambient temperature, and the condensate water test effect is good.

In some possible implementations, the ambient temperature includes the lower temperature limit, and the charging operation further includes placing the battery in an environment having a temperature that is the lower temperature limit after charging the battery.

According to the technical scheme, after the battery is quickly charged, the battery is placed in a low-temperature environment, and condensed water is easier to generate from the high-temperature environment to the low-temperature environment. Further, the battery enters the environment with the temperature from the high temperature environment to the lower temperature limit, so that the condensed water can be generated to the greatest extent, and the condensed water test effect is the best.

In some possible implementations, the ambient temperature includes the upper temperature limit, the battery parameter includes a discharge condition, and the discharge condition includes discharging the battery with a first discharge rate after the battery is allowed to stand for a second period of time if the ambient temperature is at the upper temperature limit; wherein the first discharge rate is less than a rate threshold.

Because insolation is abominable to the battery, therefore, above-mentioned technical scheme is in the condition of temperature upper limit at ambient temperature, discharges the battery, carries out the comdenstion water test to the battery under abominable operating mode promptly, can effectively verify the anti-condensation ability of battery. Further, the battery is kept stand for a first period of time in a high-temperature environment before discharging, so that the temperature of the battery can reach balance with the ambient temperature, and the condensate water test effect is good.

In some possible implementations, the ambient temperature includes the lower temperature limit, and the discharging operation further includes placing the battery in an environment having a temperature of the lower temperature limit after discharging the battery.

According to the technical scheme, after the battery is discharged, the battery is placed in a low-temperature environment, and condensed water is easier to generate from the high-temperature environment to the low-temperature environment. Further, the battery enters the environment with the temperature from the high temperature environment to the lower temperature limit, so that the condensed water can be generated to the greatest extent, and the condensed water test effect is the best.

In some possible implementations, the upper temperature limit is in the range of 40-60 ℃ and/or the lower temperature limit is in the range of 15-30 ℃.

According to the technical scheme, various factors are comprehensively considered, for example, the accuracy of condensate water test is high when the temperature of the battery and the ambient temperature reach the heat balance, and due to the fact that the battery is in an actual use scene, a thermal management strategy can be started when the temperature of the battery is too high so as to cool the battery, road output can be limited if necessary, the battery is prevented from being overheated, and further the problems of thermal runaway and the like are caused. In addition, when the relative humidity is unchanged, the lower the air temperature is, the lower the water content in the air is, and condensed water is more easily generated in a high-temperature and high-humidity environment. Therefore, the upper temperature limit is set within 40-60 ℃ and/or the lower temperature limit is set within 15-30 ℃, so that the practical use requirement of the battery can be met, and the accuracy of condensate water test can be effectively improved.

In some possible implementations, the temperature change rate includes a cooling rate, the cooling rate includes a first cooling rate and a second cooling rate, the first cooling rate is greater than the second cooling rate, and a time corresponding to the first cooling rate is earlier than a time corresponding to the second cooling rate.

In general, in the case of cooling, the cooling rate gradually decreases with time. Therefore, the first cooling rate is set to be larger than the second cooling rate by the technical scheme, so that the test scene can be more consistent with the actual use scene of the battery, and the accuracy of the condensate water test is improved.

In some possible implementations, the first duration ranges from 6 hours or more and/or the second duration ranges from 6 hours or more.

According to the technical scheme, the fact that the battery has heat capacity is considered, so that the temperature change of the battery is slower, the first duration and/or the second duration are/is set to be more than 6 hours, the battery and the environment can exchange heat fully, and the battery temperature and the environment temperature can reach balance.

In some possible implementations, the ambient humidity has a value in the range of above 85% rh.

Because the battery is relatively prone to produce condensed water in a high humidity environment. Therefore, according to the technical scheme, the ambient humidity is set to be more than 85% RH, so that more condensed water can be generated by the battery, and further the smooth performance of the condensed water test is ensured.

In some possible implementations, the battery parameters include thermal management conditions including thermal management being in an on state with the battery charged and/or discharged.

According to the technical scheme, the battery parameters are set to comprise the thermal management working condition, so that the testing process is kept consistent with the actual use scene as much as possible, the accuracy of condensate water testing is improved, the testing result characterizes the performance of the battery, and a designer can design and optimize the battery based on the testing result.

In some possible implementations, the battery parameter includes a state of charge, SOC, of the battery, the state of charge, SOC, of the battery ranging from 10% to 80%.

According to the technical scheme, the battery parameters are set to comprise the SOC of the battery, and the value range of the SOC of the battery is set within 10% -80%, namely, the performance of the battery is considered in the test process, so that the test process keeps the consistency with the actual use scene as much as possible, the accuracy of the condensed water test is improved, the test result characterizes the performance of the battery, and a designer can design and optimize the battery based on the test result.

In some possible implementations, the number of tests can range from 5 to 10.

According to the large amount of test data, the test times are set within 5-10 times, so that the accuracy of the test result can be maximized.

In some possible implementations, the method further includes: acquiring the humidity information of the battery under the condition that the condensed water test is finished; and determining the performance of the battery according to the humidity information.

According to the technical scheme, under the condition that the test is finished, the humidity information of the battery is obtained, the performance of the battery is determined according to the humidity information, namely, the performance of the battery is evaluated through the humidity information of the battery. After the condensed water is tested, the humidity information of the battery is closely related to the performance of the battery, so that the accuracy of the determined performance of the battery is higher, the design of the battery can be optimized, and the competitiveness of the battery is improved.

In some possible implementations, the humidity information includes a battery humidity, and the determining the performance of the battery according to the humidity information includes: and determining the performance of the battery according to the time required for the battery humidity to reach the intermediate humidity, wherein the intermediate humidity is the average value of the battery humidity and the ambient humidity.

According to the technical scheme, the performance of the battery is determined according to the time required for the humidity of the battery to reach the intermediate humidity, so that the battery is convenient to realize, and the accuracy of the determined performance of the battery is high.

In some possible implementations, the humidity information includes a position in the battery where condensed water is generated, the battery is provided with a detecting member, and the acquiring the humidity information of the battery includes: determining a position in the battery where condensed water is generated by the detecting member; the determining the performance of the battery according to the humidity information comprises the following steps: and determining the performance of the battery according to the position of the battery where condensed water is generated.

According to the technical scheme, the performance of the battery is determined according to the position where the condensed water is generated in the battery, namely, the performance of the battery is evaluated through the position where the condensed water is generated in the battery, so that the accuracy of the determined performance of the battery is higher, the design of the battery can be optimized, and the competitiveness of the battery is improved.

In some possible implementations, the detection member includes a water-color-changing test paper and/or a water-color-changing glue.

According to the technical scheme, the detection piece is arranged to comprise the water-contacting color-changing test paper and/or the water-contacting color-changing glue, so that the cost is low, and the position of the condensate water in the battery can be intuitively and clearly observed.

In some possible implementations, the method further includes: acquiring the insulation resistance value of the battery; the determining the performance of the battery according to the humidity information comprises the following steps: and determining the performance of the battery according to the humidity information and the insulation resistance.

Since the condensed water may cause a decrease in the insulation resistance of the battery, if the insulation resistance fails, a series of problems may be caused. Therefore, the technical scheme also obtains the insulation resistance value of the battery, determines the performance of the battery according to the insulation resistance value, and further improves the accuracy of the determined performance of the battery.

In a second aspect, there is provided an apparatus for condensate water testing, comprising: a determining unit for determining test parameters for condensate water testing, the test parameters comprising at least one of the following parameters: the ambient temperature, the ambient humidity, the battery parameters of the battery and the test times of the condensed water test; the test unit is used for testing the condensed water of the battery based on the test parameters; wherein the ambient temperature comprises at least one of: an upper temperature limit of the ambient temperature, a lower temperature limit of the ambient temperature, a first duration after the ambient temperature reaches the upper temperature limit, a second duration after the ambient temperature reaches the lower temperature limit, and a rate of temperature change of the ambient temperature.

In some possible implementations, the number of tests can range from 5 to 10.

In some possible implementations, the apparatus further includes: an acquisition unit for acquiring the humidity information of the battery under the condition that the condensed water test is finished; the determining unit is further configured to determine a performance of the battery according to the humidity information.

In some possible implementations, the humidity information includes a battery humidity, and the determining unit is specifically configured to: and determining the performance of the battery according to the time required for the battery humidity to reach the intermediate humidity, wherein the intermediate humidity is the average value of the battery humidity and the ambient humidity.

In some possible implementations, the humidity information includes a position in the battery where condensed water is generated, the battery is provided with a detecting member, and the determining unit is specifically configured to: determining a position in the battery where condensed water is generated by the detecting member; and determining the performance of the battery according to the position of the battery where condensed water is generated.

In some possible implementations, the obtaining unit is further configured to: acquiring the insulation resistance value of the battery; the determining unit is specifically configured to: and determining the performance of the battery according to the humidity information and the insulation resistance.

In a third aspect, there is provided an apparatus for condensate water testing, comprising a processor and a memory, the memory for storing a computer program, the processor for invoking the computer program to perform the method of the first aspect or implementations thereof.

In a fourth aspect, a computer-readable storage medium is provided for storing a computer program for causing a computer to perform the method of the first aspect or implementations thereof.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.

In the drawings, the drawings are not drawn to scale.

Fig. 1 is a schematic flow chart of a condensate water test according to an embodiment of the present application.

Fig. 2 is a schematic diagram of an ambient temperature change during testing in accordance with an embodiment of the present application.

Fig. 3 is a schematic diagram of the charge and discharge conditions of a battery during testing in accordance with an embodiment of the present application.

FIG. 4 is a schematic diagram of thermal management conditions during testing of an embodiment of the present application.

Fig. 5 is a schematic diagram of a condensate water testing system of an embodiment of the present application.

Fig. 6 is a specific schematic flow chart of condensate water testing of an embodiment of the application.

Fig. 7 is a schematic block diagram of an apparatus for condensate water testing of an embodiment of the present application.

Fig. 8 is a schematic block diagram of an apparatus for condensate water testing of an embodiment of the present application.

Detailed Description

Embodiments of the present application are described in further detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the embodiments described.

In the description of the present application, it is to be noted that, unless otherwise indicated, the meaning of "plurality" is two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like are merely used for convenience in describing the present application and to simplify the description, and do not denote or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments.

With the development of new energy technology, the application field of batteries is becoming wider and wider. Such as batteries, may be used as the primary power source for electrical devices (e.g., vehicles, boats, or spacecraft, etc.). It should be understood that reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity.

Alternatively, the battery may be a power storage battery. The battery may be a lithium ion battery, a lithium metal battery, a lead-acid battery, a nickel-metal-hydride battery, a lithium-sulfur battery, a lithium-air battery, a sodium ion battery, or the like, and is not particularly limited in the embodiment of the present application. In terms of battery scale, the battery in the embodiment of the present application may be a battery cell or a battery module or a battery pack, and is not particularly limited in the embodiment of the present application.

With the rapid increase of the usage amount of batteries, the problem of battery condensed water is more and more concerned. The condensed water may greatly reduce the insulating property of the battery, and may even cause a local short circuit inside the battery in severe cases.

Based on the above, the embodiment of the application provides a method for testing condensed water, which tests the battery based on at least one of the environment temperature, the environment humidity, the battery parameter of the battery and the test times of the condensed water test. On one hand, whether the battery generates condensed water or not can be determined, and if no condensed water is generated, the battery performance is better; if condensed water is generated, the battery performance is poor, the battery can be discarded, or measures can be taken to reduce adverse effects of the condensed water on the battery, for example, the ventilation quantity of a battery balance valve is reduced, or a moisture absorption sheet, a desiccant and the like are arranged in the battery, so that the problems of insulation abnormality (serious short circuit ablation), corrosion, sampling abnormality and the like caused by the condensed water are reduced. On the other hand, in the case where the test parameters include a plurality of parameters, the accuracy of the test can be effectively improved relative to the case where the condensed water test is performed on the battery based on one parameter. In still another aspect, the battery is subjected to the condensed water test according to the battery parameters of the battery, so that the condensed water test in the embodiment of the application is a performance test aiming at the battery, and the condensed water prevention capability of the battery can be effectively verified.

Fig. 1 shows a schematic flow chart of a method 100 of condensate water testing in accordance with an embodiment of the application. As shown in fig. 1, method 100 may include at least some of the following.

S110: determining test parameters for condensate water testing, the test parameters including at least one of: ambient temperature, ambient humidity, battery parameters of the battery, and number of tests for condensate water testing.

S120: and carrying out condensate water test on the battery based on the test parameters.

When the test parameter includes an ambient temperature, performing a condensed water test on the battery based on the test parameter may include: at this ambient temperature, the battery was subjected to a condensed water test.

Wherein the ambient temperature may include at least one of: an upper temperature limit of the ambient temperature, a lower temperature limit of the ambient temperature, a first duration after the ambient temperature reaches the upper temperature limit, a second duration after the ambient temperature reaches the lower temperature limit, and a rate of change of the ambient temperature.

Because the influence of the ambient temperature on the condensate water test is large, the technical scheme subdivides the ambient temperature from multiple aspects, namely, the battery is subjected to the condensate water test according to the upper temperature limit, the lower temperature limit, the duration after the upper temperature limit is reached, the duration after the lower temperature limit is reached and the temperature change rate, so that the accuracy of the condensate water test result can be further improved.

The upper temperature limit can be within 40-60 ℃. Such as 43 ℃, 50 ℃, 55 ℃, etc. Can be specifically adjusted according to manufacturer capacity and actual use situation.

According to the technical scheme, various factors are comprehensively considered, for example, the accuracy of condensate water test is high when the temperature of the battery and the ambient temperature reach the heat balance, and due to the fact that the battery is in an actual use scene, a thermal management strategy can be started when the temperature of the battery is too high so as to cool the battery, road output can be limited if necessary, the battery is prevented from being overheated, and further the problems of thermal runaway and the like are caused. In addition, when the relative humidity is unchanged, the lower the air temperature is, the lower the water content in the air is, and condensed water is more easily generated in a high-temperature and high-humidity environment. Therefore, the upper temperature limit is set within the range of 40-60 ℃, so that the practical use requirement of the battery can be met, and the accuracy of condensate water test can be effectively improved.

From the weather data (annual extremum) data during 1971-2000, it can be known that the upper temperature limit of some cities, such as Guangzhou, chongqing, fuzhou and the like, is 45 ℃, and the upper temperature limit of some cities, such as the sea, jones, zhanjiang and the like, is 40 ℃. In order to better simulate the working condition of battery condensate water generation, the embodiment of the application can start the test when the battery temperature and the ambient temperature reach the temperature balance. Considering the actual use situation of the battery, when the temperature of the battery is too high, a thermal management strategy may be started to cool the battery, and if necessary, the power output is limited to prevent the risk of thermal runaway caused by overheat of the battery.

Therefore, the upper temperature limit of the embodiment of the present application may be 45 ℃.

The lower temperature limit can be within 15-30 ℃. For example, 18℃at 25℃at 27℃and the like. Can be specifically adjusted according to manufacturer capacity and actual use situation.

In general, when the relative humidity is unchanged, the lower the air temperature is, the lower the water content in the air is, and condensed water is more easily generated in a high-temperature and high-humidity environment. From a large amount of data, it is known that in practical use conditions, the minimum temperature of the battery may be 20 ℃. Therefore, the lower temperature limit of embodiments of the present application may also be 20 ℃.

According to the technical scheme, various factors are comprehensively considered, for example, the accuracy of condensate water test is high when the temperature of the battery and the ambient temperature reach the heat balance, and due to the fact that the battery is in an actual use scene, a thermal management strategy can be started when the temperature of the battery is too high so as to cool the battery, road output can be limited if necessary, the battery is prevented from being overheated, and further the problems of thermal runaway and the like are caused. In addition, when the relative humidity is unchanged, the lower the air temperature is, the lower the water content in the air is, and condensed water is more easily generated in a high-temperature and high-humidity environment. Therefore, the value range of the lower temperature limit is set within 15-30 ℃, so that the practical use requirement of the battery can be met, and the accuracy of condensate water test can be effectively improved.

The rate of temperature change may include a rate of temperature rise and a rate of temperature decrease. In view of the fact that the probability of the battery generating condensed water under the temperature-rising condition is not large under the temperature-lowering condition, the temperature-rising rate may be 1 deg.c/min or 2 deg.c/min or the like, alternatively.

It is known through the condensation mechanism that the battery is more likely to generate condensed water in the case of a decrease in external temperature and/or an opening of thermal management when the battery is in a high temperature state. In the battery from a high-temperature environment to a low-temperature environment, the temperature difference of the environment temperature gradually decreases along with the change of time, and the cooling rate also slows down along with the change of time.

Therefore, in the embodiment of the present application, the cooling rate may include a first cooling rate and a second cooling rate, where the first cooling rate is greater than the second cooling rate, and the time corresponding to the first cooling rate is earlier than the time corresponding to the second cooling rate.

Illustratively, the cooling down may include three stages. Wherein, the cooling time of the first stage is 18 minutes, the cooling rate is 0.5 ℃/min, the cooling time of the second stage is 36 minutes, the cooling rate is 0.25 ℃/min, the cooling time of the third stage is 56 minutes, and the cooling rate is 0.125 ℃/min.

In order to ensure that the battery temperature is consistent with the ambient temperature, it is necessary to exchange heat between the battery and the environment sufficiently to balance the battery temperature and the ambient temperature. The battery temperature is slowly varying in view of the heat capacity in the battery. Thus, after the ambient temperature reaches the upper temperature limit or the lower temperature limit, it may last for a period of time.

Alternatively, the range of values for the first duration after the ambient temperature reaches the upper temperature limit may be greater than 6 hours. For example, 8 hours, 10 hours, 13 hours, 15 hours, etc.

Similarly, the second duration after the ambient temperature reaches the lower temperature limit may range from a value of more than 6 hours. For example, 8 hours, 10 hours, 13 hours, 15 hours, etc.

Alternatively, the first duration may be the same as or different from the second duration. For example, the first duration and the second duration may each be 10 hours.

As described above, the cooling process is performed stepwise. Thus, alternatively, the second duration may not include a cool down time, such as the sum of 18 minutes, 36 minutes, and 56 minutes as described above.

When the test parameters include ambient humidity, performing a condensed water test on the battery based on the test parameters may include: the battery was subjected to a condensed water test under this ambient humidity.

The higher the ambient humidity, the more easily the condensed water is generated in the battery. Therefore, the range of the environmental humidity in the embodiment of the application can be more than 85% RH. For example, the ambient humidity may be 88% RH, 90% RH, 96% RH, or the like.

The highest value of the average relative humidity of the main city month is 95% RH according to the national statistics of 2020. Thus, the ambient humidity may also be 95% rh.

It should be noted that, during the condensate water test, the ambient humidity may be kept constant all the time, for example, the ambient humidity may be 95% rh throughout the test. Alternatively, the ambient humidity may be varied, for example, 92% RH for the first half of the test and 95% RH for the second half.

In some possible embodiments, the battery parameters may include, but are not limited to, a charging condition of the battery, a discharging condition of the battery, a thermal management condition of the battery, a state of charge (SOC) of the battery, and the like.

During actual use of the battery, there is charge and discharge. In addition, the condition of fast charge by insolation is the worst condition of the battery. Therefore, in the case that the ambient temperature includes the upper temperature limit, the charging condition according to the embodiment of the present application may include charging the battery with the first charging rate after the battery is left for the first period of time in the case that the ambient temperature is at the upper temperature limit. Wherein the first charging rate is greater than the rate threshold.

According to the technical scheme, under the condition that the ambient temperature is at the upper temperature limit, the battery is charged quickly, namely, the battery is subjected to condensate water test under the worst working condition, so that the aim of effectively verifying the condensate water prevention capability of the battery under the worst working condition is fulfilled. Further, the battery is kept stand for a first period of time in a high-temperature environment before charging, so that the temperature of the battery can reach balance with the ambient temperature, and the condensate water test effect is good.

The first charging magnification may be, for example, 1C, 2C, 3C, 4C, or the like. The battery may be charged for a period of time such as 1 hour using the first charging rate.

In order to equilibrate the battery temperature to ambient temperature, the battery may therefore be left at high temperature for a first period of time prior to charging the battery. The first duration may be the first duration, or may be another duration.

Alternatively, the charging regime may also include that the battery may be placed in an environment having a temperature below an upper temperature limit after the battery is rapidly charged.

As an example, where the ambient temperature includes a lower temperature limit, the charging operation may further include placing the battery in an environment having a lower temperature limit after charging the battery.

When the ambient temperature is in a low temperature environment, the battery may also be left at low temperature for a period of time in order to equilibrate the battery temperature to the ambient temperature. For example, the rest period in the low temperature environment may be the same as the first period and may be different. When the rest time period in the low temperature environment is different from the first time period, the rest time period in the low temperature environment may be less than the first time period or may be greater than the first time period. For example, the period of rest in a low temperature environment may be a second period of time.

In the case that the ambient temperature includes the upper temperature limit, the discharging working condition of the embodiment of the application may include discharging the battery with the first discharging magnification after the battery is kept stand for the second period of time in the case that the ambient temperature is at the upper temperature limit. Wherein, the first discharge multiplying power is smaller than the multiplying power threshold value.

The first discharge magnification may be, for example, 1/4C, 1/3C, 1/2C, or the like. The duration of discharging the battery with the first discharge magnification may be, for example, greater than or equal to 3 hours.

The second duration may be the first duration, or may be another duration.

Alternatively, the discharging operation may further include that the battery may be placed in an environment having a temperature lower than an upper temperature limit after the battery is discharged.

As an example, where the ambient temperature includes a lower temperature limit, the discharging operation may further include placing the battery in an environment having a lower temperature limit after discharging the battery. According to the technical scheme, after the battery is discharged, the battery is placed in a low-temperature environment, and condensed water is easier to generate from the high-temperature environment to the low-temperature environment. Further, the battery enters the environment with the temperature from the high temperature environment to the lower temperature limit, so that the condensed water can be generated to the greatest extent, and the condensed water test effect is the best.

Alternatively, after the battery is placed in a low temperature environment, the battery may be left standing in the low temperature environment for a period of time. For example, the rest period in the low temperature environment may be the same as the second period and may be different. When the period of time of rest in the low temperature environment is different from the second period of time, the period of time of rest in the low temperature environment may be less than the second period of time or greater than the second period of time.

Currently, to improve the performance of a battery, the temperature of the battery is typically regulated by a thermal management strategy. For example, the battery is susceptible to thermal runaway due to the possibility of an increase in the battery temperature during charging or other reasons. At this time, thermal management may be turned on to cool the battery through the cooling system.

Thus, in embodiments of the present application, thermal management conditions may include turning on thermal management in the event that the battery is being charged and/or discharged. It will be appreciated that when the battery is cooled by the cooling system, condensed water is more likely to be generated by the battery at this time due to the lower temperature of the cooling liquid.

In some embodiments, the SOC of the battery may range from 10% -80%. For example, the SOC of the battery may be 20%, 30%, 40%, 50%, 60%, 70%, or the like.

According to the technical scheme, the battery parameters are set to comprise the SOC of the battery, and the value range of the SOC of the battery is set within 10% -80%, namely, the performance of the battery is considered in the test process, so that the test process keeps the consistency with the actual use scene as much as possible, the accuracy of the condensate water test is improved, the test result characterizes the performance of the battery, and design optimization can be carried out on the battery by a designer based on the test result.

In some embodiments, the range of values for the number of tests may be set within 5-10 times based on the rising trend of the ambient temperature. For example, based on the test data statistics, the number of tests may be 8, i.e., the condensate test may be performed for 8 cycles.

Fig. 2 shows the course of the change in ambient temperature during the test.

Wherein T1-T2 are the preparation phases in which the battery is in temperature equilibrium with the environment. The T2-T3 stage is a temperature rising stage, the ambient temperature rises from a lower temperature limit to an upper temperature limit, and the temperature rising rate can be 1 ℃/min. The T3-T4 stage is a continuous stage after the ambient temperature reaches the upper temperature limit. The T4-T5 stage is a cooling stage, and the ambient temperature is reduced to the lower temperature limit at the time of T5. It can be seen that at the initial stage of the decrease in ambient temperature, the cooling rate is faster and gradually decreases with increasing time. The T5-T6 stage is a continuous stage after the ambient temperature reaches the lower temperature limit. The T6-T7 stage is a temperature rising stage, and the ambient temperature rises from a lower temperature limit to an upper temperature limit. The T7-T8 stage is a continuous stage after the ambient temperature reaches the upper temperature limit. The T8-T9 stage is a cooling stage, and the ambient temperature is reduced to the lower temperature limit at the time of T9. It can be seen that at the initial stage of the decrease in ambient temperature, the cooling rate is faster and gradually decreases with increasing time. The T9-T10 stage is a continuous stage after the ambient temperature reaches the lower temperature limit.

Fig. 3 is a schematic diagram of the charge and discharge conditions of the battery during the test.

Wherein in the T2-T3 stage, the battery enters the environment with the environment temperature being the upper temperature limit from the low-temperature environment, and is positioned in the T3-T4 stage ₁ During the period of time when the ambient temperature reaches the upper temperature limit, the battery is exposed to high temperature, and at T4 ₁ The battery is charged quickly by adopting a charging multiplying power of 1C at the moment, T4 ₂ And (5) ending the instant charging. At T4 ₂ In the T5 phase, the battery enters a low temperature environment, such as a parking lot, where the ambient temperature is a lower temperature limit. The T5-T6 stage is a standing stage of the battery in a low-temperature environment. In the stage T6-T7, the battery enters the environment with the upper temperature limit of the ambient temperature again from the low-temperature environment, the battery is exposed to the high temperature in the stage T7-T8, namely in the period of time when the ambient temperature reaches the upper temperature limit, the battery is discharged by adopting a discharge rate of 1/3C at the moment T8, and the discharge at the moment T9 is ended and enters the low-temperature environment with the lower temperature limit of the ambient temperature, such as a parking lot. The T9-T10 stage is a standing stage of the battery in a low-temperature environment.

FIG. 4 shows a schematic diagram of thermal management conditions during testing. Where "1" indicates that thermal management is in an on state and "0" indicates that thermal management is in an off state.

As shown in FIG. 4, at T1-T4 ₁ In the stage, the thermal management is in a closed state. At T4 ₁ - T4 ₂ The phase, i.e. in the case of a charged battery, of thermal management from the closed stateThe state transitions to an on state. T4 ₂ And when the charging is finished at the moment, the thermal management is switched from the on state to the off state. At T4 ₂ -a T8 phase, thermal management is in an off state. In the phase T8-T9, i.e. with the battery in a discharged state, the thermal management is switched from an off state to an on state. And when the discharge is finished at the time T9, the thermal management is switched from the on state to the off state.

It should be noted that fig. 2, 3 and 4 correspond in time. For example, time T8 in fig. 2 corresponds to time T8 in fig. 3 and time T8 in fig. 4.

The method 100 may be performed in the condensate water testing system 500 shown in fig. 5. As shown in fig. 5, the condensate water testing system 500 may include a battery 510, an environmental bin 520, a charge and discharge machine 530, a water chiller 540, and a data acquisition control system 550.

The battery 510 may have a humidity sensor, a temperature sensor, and the like built therein. The environmental chamber 520 may provide a temperature and humidity environment for the battery 510, and the rate of temperature rise and the rate of temperature reduction may be satisfactory. The temperature of the environmental chamber 520 is adjusted to achieve the change in the ambient temperature. The charge and discharge machine 530 may charge or discharge the battery 510. The water chiller 540 may thermally manage, e.g., cool, the battery 510. The data acquisition control system 550 can acquire data of the humidity sensor and the temperature sensor, and control each system to perform according to a preset flow.

To more clearly describe embodiments of the present application, one specific implementation of method 100 is described in detail below in conjunction with FIG. 6. The first time length and the second time length are 10 hours, the first charging multiplying power is 1C, the first discharging multiplying power is 1/3C, and the test times are 8 times.

In step 601, the initial ambient temperature and humidity of the ambient bin are set and the battery temperature is equilibrated with the ambient temperature.

Illustratively, the ambient humidity may be 95% RH.

In step 602, the ambient temperature is raised from an initial temperature.

The ambient temperature can be increased from the initial temperature to the upper temperature limit, and the temperature rising rate is 1 ℃/min.

In step 603, the cell is left to stand in a high temperature environment for 10 hours.

In step 604, the battery is charged with a charging rate of 1C while the thermal management strategy is turned on.

In step 605, charging of the battery is stopped and the thermal management strategy is turned off.

In step 606, the ambient temperature is cooled until it falls to a lower temperature limit.

In step 607, the cell is left to stand in a low temperature environment for 8.2 hours.

In step 608, the ambient temperature is raised.

In step 609, the battery is left to stand in a high temperature environment for 10 hours.

In step 610, the battery is discharged with a discharge rate of 1/3C while the thermal management strategy is turned on.

In step 611, the discharge of the battery is stopped and the thermal management strategy is turned off.

In step 612, the ambient temperature is cooled until it falls to a lower temperature limit.

In step 613, the battery is left to stand in a low temperature environment for 6.1 hours.

Thereafter, execution continues from step 602, and is repeated 7 times, i.e., the entire test process loops 8 times in total. After step 613 is performed at the 8 th time, the entire test flow ends.

Further, in order to more clearly compare the merits of different batteries under the condensed water test, the humidity information of the battery can be obtained under the condition that the condensed water test is finished, and the performance of the battery can be determined according to the humidity information.

Alternatively, the humidity information of the battery may be acquired after each cycle is completed. Alternatively, the humidity information of the battery may be acquired after the entire test procedure is completed.

Alternatively, the humidity information may include battery humidity. At this time, the performance of the battery may be determined according to the time required for the humidity of the battery to reach the intermediate humidity.

The intermediate humidity may be an average of the battery humidity and the ambient humidity. For example, the battery humidity is 40% RH, the ambient humidity is 95% RH, and the intermediate humidity is 67.5% RH.

Alternatively, the battery humidity may be the humidity of the battery at the beginning of the test, the initial humidity value of the battery. Since the external humidity is a high humidity environment, there is a tendency that the battery humidity rises after each cycle is ended.

For convenience of description, the time required for the humidity of the battery to reach the intermediate humidity is referred to as a moisture blocking time in the embodiment of the present application. Wherein, the larger the moisture resistance time is, the better the effect of discharging condensed water from the battery is, and the better the performance of the battery is.

According to the technical scheme, the performance of the battery is determined according to the time required for the humidity of the battery to reach the middle humidity, so that the battery is convenient to realize, and the accuracy of the determined performance of the battery is high.

Further, the method 100 may further include: and obtaining the insulation resistance value of the battery. In this case, the performance of the battery may be determined according to the humidity information and the insulation resistance value.

Wherein, the higher the insulation resistance, the better the performance of the battery.

In the case where there are a plurality of batteries, the performance of the plurality of batteries may be compared. Alternatively, specific differences in performance between different cells may be determined by relative moisture resistance after comparison.

For example, if the moisture resistance time of the battery a is 100 hours and the moisture resistance time of the battery b is 200 hours, the performance of the battery b is superior to that of the battery a, and the relative moisture resistance of the battery b to the battery a is 100%.

Optionally, the humidity information may further include a position in the battery where condensed water is generated, and determining the performance of the battery according to the humidity information may include: the performance of the battery is determined according to the position in the battery where the condensed water is generated.

As an example, a detecting member may be provided on the battery, and a position in the battery where condensed water is generated may be determined by the detecting member.

The detection member may be provided on, for example, an upper cover, a case, a tab, a water cooling plate, a high-low voltage connector, or the like of the battery.

The test element may include, but is not limited to, a water-swellable test paper and a water-swellable gel. Wherein, the color-changing test paper and the color-changing glue can change color when meeting water, for example, the color can be changed into red, and the color can hardly disappear. The detection piece is arranged to comprise the water-contacting color-changing test paper and/or the water-contacting color-changing glue, so that the cost is low, and the position of the condensate water in the battery can be intuitively and clearly observed.

Further, the severity of condensed water generation in the battery can also be calculated by the rate of discoloration. For example, 100 pieces of water color-changing test paper are stuck in the battery, wherein 10 pieces of color-changing test paper have color change, and the color change rate is 10%.

In the embodiment of the present application, the sequence number of each process does not mean the sequence of execution sequence, and the execution sequence of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present application.

On the premise of no conflict, the embodiments and/or technical features in the embodiments described in the present application can be combined with each other arbitrarily, and the combined technical solutions should also fall into the protection scope of the present application.

The method for testing the condensed water according to the embodiment of the present application is described in detail above, and the apparatus for testing the condensed water according to the embodiment of the present application will be described below. It should be understood that the device for testing condensed water in the embodiment of the present application may perform the method for testing condensed water in the embodiment of the present application.

Fig. 7 shows a schematic block diagram of an apparatus 700 for condensate water testing in accordance with an embodiment of the present application. As shown in fig. 7, the condensed water testing apparatus 700 may include:

a determining unit 710 for determining test parameters for condensate water testing, the test parameters including at least one of the following parameters: ambient temperature, ambient humidity, battery parameters of the battery and the number of tests of the condensed water test.

And a test unit 720, configured to perform the condensed water test on the battery based on the test parameter.

Wherein the ambient temperature comprises at least one of: an upper temperature limit of the ambient temperature, a lower temperature limit of the ambient temperature, a first duration after the ambient temperature reaches the upper temperature limit, a second duration after the ambient temperature reaches the lower temperature limit, and a rate of temperature change of the ambient temperature.

Optionally, in an embodiment of the present application, the ambient temperature includes the upper temperature limit, and the battery parameter includes a charging condition, where the charging condition includes that, when the ambient temperature is at the upper temperature limit, the battery is allowed to stand for a first period of time, and then the battery is charged with a first charging rate; wherein the first charging rate is greater than a rate threshold.

Optionally, in an embodiment of the present application, the ambient temperature includes the lower temperature limit, and the charging operation further includes placing the battery in an environment having a temperature that is the lower temperature limit after the battery is charged.

Optionally, in an embodiment of the present application, the ambient temperature includes the upper temperature limit, and the battery parameter includes a discharge condition, where the discharge condition includes that, when the ambient temperature is at the upper temperature limit, the battery is allowed to stand for a second period of time, and then the battery is discharged with a first discharge rate; wherein the first discharge rate is less than a rate threshold.

Optionally, in an embodiment of the present application, the ambient temperature includes the lower temperature limit, and the discharging operation further includes placing the battery in an environment having a temperature of the lower temperature limit after discharging the battery.

Optionally, in an embodiment of the present application, the upper temperature limit is within a range of 40 ℃ to 60 ℃ and/or the lower temperature limit is within a range of 15 ℃ to 30 ℃.

Optionally, in an embodiment of the present application, the temperature change rate includes a cooling rate, the cooling rate includes a first cooling rate and a second cooling rate, the first cooling rate is greater than the second cooling rate, and a time corresponding to the first cooling rate is earlier than a time corresponding to the second cooling rate.

Optionally, in an embodiment of the present application, the value range of the first duration is greater than 6 hours, and/or the value range of the second duration is greater than 6 hours.

Optionally, in an embodiment of the present application, the range of the environmental humidity is more than 85% rh.

Optionally, in an embodiment of the present application, the battery parameter includes a thermal management condition, and the thermal management condition includes that thermal management is in an on state when the battery is charged and/or discharged.

Optionally, in an embodiment of the present application, the battery parameter includes a state of charge SOC of the battery, and a value of the state of charge SOC of the battery ranges from 10% to 80%.

Optionally, in an embodiment of the present application, the number of tests ranges from 5 times to 10 times.

Optionally, in an embodiment of the present application, the apparatus 700 for testing condensate water further includes: an acquisition unit for acquiring the humidity information of the battery under the condition that the condensed water test is finished; the determining unit 710 is further configured to determine a performance of the battery according to the humidity information.

Optionally, in an embodiment of the present application, the humidity information includes a battery humidity, and the determining unit 710 is specifically configured to: and determining the performance of the battery according to the time required for the battery humidity to reach the intermediate humidity, wherein the intermediate humidity is the average value of the battery humidity and the ambient humidity.

Optionally, in an embodiment of the present application, the humidity information includes a position in the battery where condensed water is generated, a detecting member is disposed on the battery, and the determining unit 710 is specifically configured to: determining a position in the battery where condensed water is generated by the detecting member; and determining the performance of the battery according to the position of the battery where condensed water is generated.

Optionally, in an embodiment of the present application, the detection element includes a water-color-changing test paper and/or a water-color-changing glue.

Optionally, in an embodiment of the present application, the obtaining unit is further configured to: acquiring the insulation resistance value of the battery; the determining unit 710 is specifically configured to: and determining the performance of the battery according to the humidity information and the insulation resistance.

It should be appreciated that the apparatus 700 for testing condensate water may implement the corresponding operations in the method 100, and will not be described herein for brevity.

Fig. 8 is a schematic hardware structure of an apparatus 800 for testing condensate water according to an embodiment of the present application. The device 800 for condensate water testing comprises a memory 801, a processor 802, a communication interface 803, and a bus 804. Wherein the memory 801, the processor 802, and the communication interface 803 are communicatively connected to each other through a bus 804.

The memory 801 may be a read-only memory (ROM), a static storage device, and a random access memory (random access memory, RAM). The memory 801 may store a program, and when the program stored in the memory 801 is executed by the processor 802, the processor 802 and the communication interface 803 are used to perform the respective steps of the method of condensate water testing of the embodiment of the present application.

The processor 802 may employ a general-purpose central processing unit (central processing unit, CPU), microprocessor, application specific integrated circuit (application specific integrated circuit, ASIC), graphics processor (graphics processing unit, GPU) or one or more integrated circuits for executing associated programs to perform functions required to be performed by the units in the apparatus of the present application or to perform the method of condensate testing of the present application.

The processor 802 may also be an integrated circuit chip with signal processing capabilities. In implementation, various steps of the method of condensate water testing of embodiments of the present application may be performed by instructions in the form of integrated logic circuits or software of hardware in the processor 802.

The processor 802 may also be a general purpose processor, a digital signal processor (digital signal processing, DSP), an ASIC, an off-the-shelf programmable gate array (field programmable gate array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 801, and the processor 802 reads information in the memory 801, and in combination with hardware thereof, performs functions to be performed by units included in the apparatus 800 for testing condensate water according to an embodiment of the present application, or performs a method for testing condensate water according to an embodiment of the present application.

The communication interface 803 enables communication between the apparatus 800 for condensate water testing and other devices or communication networks using a transceiver device such as, but not limited to, a transceiver.

Bus 804 may include a path for transferring information between the various components of device 800 (e.g., memory 801, processor 802, communication interface 803) for condensate water testing.

It should be noted that although the above-described apparatus 800 for testing condensate water only shows a memory, a processor, a communication interface, in a particular implementation, those skilled in the art will appreciate that the apparatus 800 for testing condensate water may also include other components necessary to achieve proper operation. Also, as will be appreciated by those skilled in the art, the apparatus 800 for condensate water testing may also include hardware devices that perform other additional functions, as desired. Furthermore, it will be appreciated by those skilled in the art that the apparatus 800 for condensate water testing may also include only the components necessary to implement embodiments of the present application, and not all of the components shown in FIG. 8.

The embodiments of the present application also provide a computer readable storage medium storing a computer program for executing the methods of the various embodiments of the present application described above.

The computer readable storage medium may be a transitory computer readable storage medium or a non-transitory computer readable storage medium.

The embodiments of the present application also provide a computer program product comprising a computer program stored on a computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the method of condensate water testing described above.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of condensate water testing, the method comprising:

determining test parameters for condensate water testing, the test parameters including at least one of the following parameters: the ambient temperature, the ambient humidity, the battery parameters of the battery and the test times of the condensed water test;

Based on the test parameters, performing the condensed water test on the battery;

2. The method of claim 1, wherein the ambient temperature comprises the upper temperature limit, and the battery parameter comprises a charging condition comprising charging the battery with a first charging rate after the battery has been left for a first period of time with the ambient temperature at the upper temperature limit;

wherein the first charging rate is greater than a rate threshold.

3. The method of claim 2, wherein the ambient temperature includes the lower temperature limit, and wherein the charging operation further comprises placing the battery in an environment having a temperature that is the lower temperature limit after charging the battery.

4. A method according to any one of claims 1 to 3, wherein the ambient temperature comprises the upper temperature limit, the battery parameter comprises a discharge condition comprising discharging the battery with a first discharge rate after leaving the battery for a second period of time with the ambient temperature at the upper temperature limit;

Wherein the first discharge rate is less than a rate threshold.

5. The method of claim 4, wherein the ambient temperature includes the lower temperature limit, and wherein the discharging operation further comprises placing the battery in an environment having a temperature of the lower temperature limit after discharging the battery.

6. A method according to any one of claims 1 to 3, wherein the upper temperature limit is in the range of 40-60 ℃ and/or the lower temperature limit is in the range of 15-30 ℃.

7. A method according to any one of claims 1 to 3, wherein the rate of temperature change comprises a rate of cooling comprising a first rate of cooling and a second rate of cooling, the first rate of cooling being greater than the second rate of cooling, the first rate of cooling corresponding to a time earlier than the second rate of cooling corresponding to a time.

8. A method according to any one of claims 1 to 3, wherein the first duration has a value in the range of more than 6 hours and/or the second duration has a value in the range of more than 6 hours.

9. A method according to any one of claims 1 to 3, wherein the ambient humidity has a value in the range of 85% rh or more.

10. A method according to any one of claims 1 to 3, wherein the battery parameters include thermal management conditions including thermal management being in an on state with the battery charged and/or discharged.

11. A method according to any one of claims 1 to 3, wherein the battery parameter comprises the state of charge, SOC, of the battery, the value of the state of charge, SOC, of the battery ranging from 10% to 80%.

12. A method according to any one of claims 1 to 3, wherein the number of tests is within the range of 5-10.

13. A method according to any one of claims 1 to 3, further comprising:

acquiring the humidity information of the battery under the condition that the condensed water test is finished;

and determining the performance of the battery according to the humidity information.

14. The method of claim 13, wherein the humidity information includes battery humidity, and wherein the determining the performance of the battery based on the humidity information includes:

and determining the performance of the battery according to the time required for the battery humidity to reach the intermediate humidity, wherein the intermediate humidity is the average value of the battery humidity and the ambient humidity.

15. The method of claim 13, wherein the humidity information includes a location in the battery where condensed water is generated, the battery having a detecting member disposed thereon, the acquiring the humidity information of the battery comprising:

determining a position in the battery where condensed water is generated by the detecting member;

the determining the performance of the battery according to the humidity information comprises the following steps:

and determining the performance of the battery according to the position of the battery where condensed water is generated.

16. The method of claim 15, wherein the test element comprises a water-swellable test paper and/or a water-swellable gel.

17. The method of claim 13, wherein the method further comprises:

acquiring the insulation resistance value of the battery;

and determining the performance of the battery according to the humidity information and the insulation resistance.

18. A device for testing condensate water, comprising:

a determining unit for determining test parameters for condensate water testing, the test parameters comprising at least one of the following parameters: the ambient temperature, the ambient humidity, the battery parameters of the battery and the test times of the condensed water test;

The test unit is used for testing the condensed water of the battery based on the test parameters;

19. The apparatus of claim 18, wherein the ambient temperature comprises the upper temperature limit, and the battery parameter comprises a charging condition comprising charging the battery with a first charging rate after the battery has been left for a first period of time with the ambient temperature at the upper temperature limit;

wherein the first charging rate is greater than a rate threshold.

20. The apparatus of claim 19, wherein the ambient temperature comprises the lower temperature limit, and wherein the charging operation further comprises placing the battery in an environment having a temperature that is the lower temperature limit after charging the battery.

21. The apparatus of any one of claims 18 to 20, wherein the ambient temperature comprises the upper temperature limit, the battery parameter comprises a discharge condition, the discharge condition comprises discharging the battery with a first discharge rate after the battery is left to stand for a second period of time with the ambient temperature at the upper temperature limit;

Wherein the first discharge rate is less than a rate threshold.

22. The apparatus of claim 21, wherein the ambient temperature comprises the lower temperature limit, and wherein the discharging operation further comprises placing the battery in an environment having a temperature of the lower temperature limit after discharging the battery.

23. The apparatus according to any one of claims 18 to 20, wherein the upper temperature limit is within a range of 40-60 ℃ and/or the lower temperature limit is within a range of 15-30 ℃.

24. The apparatus of any one of claims 18 to 20, wherein the rate of temperature change comprises a cooling rate, the cooling rate comprising a first cooling rate and a second cooling rate, the first cooling rate being greater than the second cooling rate, the first cooling rate corresponding to a time earlier than the second cooling rate corresponding to a time.

25. The apparatus of any one of claims 18 to 20, wherein the first duration is over a range of values of 6 hours and/or the second duration is over a range of values of 6 hours.

26. The apparatus according to any one of claims 18 to 20, wherein the ambient humidity has a value in the range of 85% rh or more.

27. The apparatus of any one of claims 18 to 20, wherein the battery parameter comprises a thermal management condition comprising thermal management being in an on state with the battery charged and/or discharged.

28. The apparatus of any one of claims 18 to 20, wherein the battery parameter comprises a state of charge, SOC, of the battery, the state of charge, SOC, of the battery ranging from 10% to 80%.

29. The device of any one of claims 18 to 20, wherein the number of tests is within a range of 5-10.

30. The apparatus according to any one of claims 18 to 20, further comprising:

an acquisition unit for acquiring the humidity information of the battery under the condition that the condensed water test is finished;

the determining unit is further configured to determine a performance of the battery according to the humidity information.

31. The apparatus according to claim 30, wherein the humidity information comprises a battery humidity, the determining unit being specifically configured to:

32. The device according to claim 30, wherein the humidity information comprises a position in the battery where condensed water is generated, the battery being provided with a detecting member, the determining unit being specifically configured to:

33. The device of claim 32, wherein the detection member comprises a water-swellable test paper and/or a water-swellable gel.

34. The apparatus of claim 30, wherein the acquisition unit is further configured to:

acquiring the insulation resistance value of the battery;

the determining unit is specifically configured to:

35. A device for testing condensate water, comprising:

a memory for storing a program;

a processor for executing the program stored in the memory, the processor being for performing the method of condensate water testing according to any one of claims 1 to 17 when the program stored in the memory is executed.

36. A computer-readable storage medium storing a computer program that causes a computer to perform the method of condensate water testing of any one of claims 1 to 17.