Battery early warning method and system

Abstract

The invention relates to the technical field of battery safety monitoring, and discloses a battery early warning method and system, and the method comprises the steps: obtaining a temperature value and an air pressure value of a battery in real time when the battery is charged according to a preset charging system or discharged according to a preset discharging system in a normal temperature environment; selecting a standard air pressure value and a lithium precipitation alarm threshold value corresponding to the current temperature value of the battery, and obtaining the current air pressure change speed of the battery; and judging whether the current air pressure value of the battery is smaller than a standard air pressure value, if so, judging that the battery is in a normal working state, otherwise, judging whether the current air pressure change speed of the battery is greater than or equal to a lithium precipitation alarm threshold value, if so, judging that the battery is in an abnormal working state, and sending out an early warning signal. The temperature value and the air pressure value of the battery are obtained in real time, whether the battery is in the abnormal working state or not is judged based on the standard air pressure value corresponding to the current temperature value of the battery and the lithium precipitation alarm threshold value, early warning is carried out when the battery is in the abnormal working state, and the early warning accuracy is improved.

Description

Technical Field

[0001] Embodiments of the present invention relate to the technical field of battery safety monitoring, and particularly to a battery warning method and system. Background Art

[0002] In the field of battery applications, lithium-ion batteries, sodium-ion batteries, and solid-state batteries are widely used. However, due to the gradual attenuation of their lifespan during the recycling process, the safety risks faced by batteries are also continuously increasing.

[0003] Traditional battery safety detection methods mainly rely on the real-time monitoring of battery voltage and temperature. Once the voltage or temperature exceeds a pre-set specific value, the system will automatically activate the power-off protection mechanism. However, this method has obvious limitations. Many potential safety hazards often cause changes in voltage or temperature only at the moment of explosion, making it impossible for staff to take effective remedial measures in a timely manner, which may lead to serious consequences.

[0004] To improve this situation, some recent products have added pressure sensors inside the battery to monitor the air pressure changes inside the battery. When the air pressure inside the battery rises to a specific value, the system will issue an alarm signal in a timely manner to remind the staff to conduct a comprehensive inspection of the system. This innovative method has advanced the warning time to a certain extent and provided a new idea for ensuring battery safety.

[0005] However, since the air pressure inside the battery changes with temperature fluctuations during normal operation, it is faced with a dilemma when setting the standard air pressure value. If the standard air pressure value is set too high, some potential safety risks will be difficult to detect in a timely manner; if the standard air pressure value is set too low, false alarms will occur frequently, which will lead to a significant increase in unnecessary maintenance work and a sharp rise in maintenance costs. Summary of the Invention

[0006] In view of the above problems, embodiments of the present invention provide a battery warning method and system for solving the problem that the standard air pressure value based on a single parameter setting in the prior art cannot accurately monitor the battery safety risk.

[0007] According to one aspect of the embodiments of the present invention, a battery warning method is provided, including the steps of:

[0008] When the battery is charged at a preset charging regime or discharged at a preset discharging regime in a normal temperature environment, the temperature value and air pressure value of the battery are obtained in real time;

[0009] Select the standard air pressure value and the lithium plating alarm threshold corresponding to the current temperature value of the battery, and obtain the current air pressure change rate of the battery;

[0010] Determine whether the current air pressure value of the battery is less than the standard air pressure value corresponding to the current temperature value. If so, it is determined that the battery is in a normal working state; otherwise, determine whether the current air pressure change rate of the battery is greater than or equal to the lithium plating alarm threshold. If so, it is determined that the battery is in an abnormal working state;

[0011] When it is determined that the battery is in an abnormal working state, a warning signal is issued;

[0012] Among them, the current air pressure change rate of the battery is defined as the ratio of the air pressure change amount and the temperature change amount corresponding to the current temperature value and the previous temperature value of the battery.

[0013] In some alternative implementation manners, selecting the standard air pressure value corresponding to the current temperature value of the battery specifically includes the steps of:

[0014] Previously, test the battery at room temperature in a room temperature environment with a room temperature test charging regime or a room temperature test discharging regime, and obtain the temperature value and air pressure value of the room temperature test battery in real time;

[0015] Select the air pressure value corresponding to the current temperature value of the room temperature test battery as the standard air pressure value corresponding to the current temperature value of the battery;

[0016] Among them, the specifications of the room temperature test battery are the same as those of the battery, the room temperature test charging regime is the same as the preset charging regime, the room temperature test discharging regime is the same as the preset discharging regime, and the current temperature value of the room temperature test battery is the same as the current temperature value of the battery.

[0017] In some alternative implementation manners, selecting the air pressure value corresponding to the current temperature value of the room temperature test battery as the standard air pressure value corresponding to the current temperature value of the battery specifically includes the steps of:

[0018] According to the temperature value and air pressure value of the room temperature test battery, fit to obtain a first linear function relationship in which the air pressure value of the room temperature test battery and the temperature value are linearly related;

[0019] According to the first linear function relationship, calculate the air pressure value corresponding to the current temperature value of the room temperature test battery as the standard air pressure value corresponding to the current temperature value of the battery.

[0020] In some alternative implementation manners, selecting the air pressure value corresponding to the current temperature value of the room temperature test battery as the standard air pressure value corresponding to the current temperature value of the battery further includes the steps of:

[0021] Calculate the sum of the air pressure value corresponding to the current temperature value of the room temperature test battery and the factory air pressure of the battery as the standard air pressure value corresponding to the current temperature value of the battery.

[0022] In some alternative implementation manners, selecting the air pressure value corresponding to the current temperature value of the room temperature test battery specifically includes the steps of:

[0023] Select the minimum air pressure value corresponding to the current temperature value in multiple tests of the normal temperature test battery as the air pressure value corresponding to the current temperature value of the normal temperature test battery.

[0024] In some alternative implementation manners, selecting the lithium plating alarm threshold corresponding to the current temperature value of the battery specifically includes the steps of:

[0025] Previously, use the normal temperature test battery to charge with the normal temperature test charging regime or discharge with the normal temperature test discharging regime in the normal temperature environment, and obtain the temperature value and air pressure value of the normal temperature test battery in real time;

[0026] Previously, use the low temperature test battery to charge with the low temperature test charging regime or discharge with the low temperature test discharging regime in the low temperature environment, and obtain the temperature value and air pressure value of the low temperature test battery in real time;

[0027] Obtain the current air pressure change rate of the normal temperature test battery and the current air pressure change rate of the low temperature test battery, and select any value between the current air pressure change rate of the normal temperature test battery and the current air pressure change rate of the low temperature test battery as the lithium plating alarm threshold corresponding to the current temperature value of the battery;

[0028] Among them, the current air pressure change rate of the normal temperature test battery is defined as the ratio of the air pressure change amount and the temperature change amount corresponding to the current temperature value and the previous temperature value of the normal temperature test battery. The specification of the normal temperature test battery is the same as that of the battery. The normal temperature test charging regime is the same as the preset charging regime. The normal temperature test discharging regime is the same as the preset discharging regime. The current temperature value of the normal temperature test battery is the same as the current temperature value of the battery. The previous temperature value of the normal temperature test battery is the same as the previous temperature value of the battery;

[0029] The current air pressure change rate of the low temperature test battery is defined as the ratio of the air pressure change amount and the temperature change amount corresponding to the current temperature value and the previous temperature value of the low temperature test battery. The specification of the low temperature test battery is the same as that of the battery. The low temperature test charging regime is the same as the preset charging regime. The low temperature test discharging regime is the same as the preset discharging regime. The current temperature value of the low temperature test battery is the same as the current temperature value of the battery. The previous temperature value of the low temperature test battery is the same as the previous temperature value of the battery.

[0030] In some alternative implementation manners, obtaining the current air pressure change rate of the normal temperature test battery and the current air pressure change rate of the low temperature test battery, and selecting any value between the current air pressure change rate of the normal temperature test battery and the current air pressure change rate of the low temperature test battery as the lithium plating alarm threshold corresponding to the current temperature value of the battery specifically includes the steps of:

[0031] According to the temperature value and air pressure value of the battery during normal temperature testing, a first linear function relationship in which the air pressure value and temperature value of the battery during normal temperature testing are linearly related is obtained by fitting;

[0032] According to the temperature value and air pressure value of the battery during low temperature testing, a second linear function relationship in which the air pressure value and temperature value of the battery during low temperature testing are linearly related is obtained by fitting;

[0033] Between the first slope of the first linear function relationship and the second slope of the second linear function relationship, any value is selected as the lithium plating alarm threshold corresponding to the current temperature value of the battery.

[0034] In some alternative implementation manners, obtaining the current air pressure change rate of the battery during normal temperature testing and the current air pressure change rate of the battery during low temperature testing specifically includes the steps of:

[0035] Select the minimum current air pressure change rate of the battery during normal temperature testing in multiple tests as the current air pressure change rate of the battery during normal temperature testing;

[0036] Select the minimum current air pressure change rate of the battery during low temperature testing in multiple tests as the current air pressure change rate of the battery during low temperature testing.

[0037] In some alternative implementation manners, obtaining the temperature value and air pressure value of the battery in real time specifically includes the steps of:

[0038] The temperature value and air pressure value of the battery are obtained in real time through a temperature sensor and an air pressure sensor installed in the battery.

[0039] According to another aspect of the embodiments of the present invention, a battery warning system is provided, including: a data acquisition module, a data processing module, a determination module, and a warning module, and the data acquisition module, the data processing module, the determination module, and the warning module are communicatively connected;

[0040] The data acquisition module is configured to obtain the temperature value and air pressure value of the battery during charging or discharging in real time, and send the temperature value and air pressure value to the data processing module and the determination module;

[0041] The data processing module is configured to select the standard air pressure value and the lithium plating alarm threshold corresponding to the current temperature value of the battery, obtain the current air pressure change rate of the battery and send it to the determination module;

[0042] The determination module is configured to determine whether the current air pressure value of the battery is less than the standard air pressure value corresponding to the current temperature value, and whether the current air pressure change rate of the battery is greater than or equal to the lithium plating alarm threshold, and further determine whether the battery is in an abnormal working state, and send the determination result that the battery is in an abnormal working state to the warning module;

[0043] The warning module is used to issue a warning signal.

[0044] Compared with the prior art, the present invention has the following advantages:

[0045] The battery warning method provided by the present invention determines whether the battery is in an abnormal working state by obtaining the temperature value and air pressure value of the battery in real time, and based on the standard air pressure value and lithium plating alarm threshold corresponding to the current temperature value of the battery. When the battery is in an abnormal working state, a warning is given, avoiding the inability to perform mutual verification when using only a single parameter of air pressure or temperature for warning, improving the accuracy of lithium plating warning, reducing the misjudgment probability of battery lithium plating and the maintenance cost caused by misjudgment. At the same time, the influence factor of temperature on air pressure is eliminated, and the standard air pressure value is set more precisely.

[0046] The above description is only an overview of the technical solution of the embodiment of the present invention. In order to be able to understand the technical means of the embodiment of the present invention more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the embodiment of the present invention more obvious and understandable, the specific embodiments of the present invention are given below. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The drawings are only used to illustrate the embodiments and are not considered as limiting the present invention. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0048] Figure 1 Shows a schematic flow chart of a battery warning method provided by an embodiment of the present invention;

[0049] Figure 2 Shows a schematic flow chart of the selection of the standard air pressure value in a battery warning method provided by an embodiment of the present invention;

[0050] Figure 3 Shows a schematic flow chart of the selection of the lithium plating alarm threshold in a battery warning method provided by an embodiment of the present invention;

[0051] Figure 4 Shows a schematic structural diagram of a battery warning system provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0052] Hereinafter, the exemplary embodiments of the present invention will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein.

[0053] This embodiment discloses a battery warning method to solve the problem in the prior art that the standard air pressure value set based on a single parameter cannot accurately monitor the battery safety risk. The battery warning method is asFigure 1 As shown, it includes the following steps:

[0054] S10. When the battery is charged at a preset charging regime or discharged at a preset discharging regime in a normal temperature environment, the temperature value and air pressure value of the battery are acquired in real time.

[0055] In this step, it should be clear that the battery has its specific specification parameters. The charging regime refers to a series of specifications and parameter settings that the battery follows during the charging process, mainly including charging current, charging voltage, charging time, and charging method, etc.; the discharging regime is similar to the charging regime, which is the specification and parameter settings for the battery discharging process, including discharging current, discharging cut-off voltage, discharging time, and discharging method, etc.

[0056] In addition, in this embodiment, the acquisition of the temperature value and air pressure value of the battery is based on temperature sensors and air pressure sensors integrally arranged in the battery. In view of the fact that the temperature sensors and air pressure sensors are integrally installed in the battery, therefore, the installation positions of the air pressure sensors and temperature sensors are close and fixed, and thus the temperature and air pressure inside the battery are synchronously monitored.

[0057] Specifically, the air pressure sensors and temperature sensors are installed on the battery top cover, and the selected temperature sensors and air pressure sensors have determined measurement ranges and precisions.

[0058] Therefore, this step can be specifically understood as: when the battery is charged at a preset charging power with constant power in a normal temperature environment, the temperature value and air pressure value of the battery are acquired in real time through the temperature sensors and air pressure sensors; or, when the battery is discharged at a preset discharging power with constant power in a normal temperature environment, the temperature value and air pressure value of the battery are acquired in real time through the temperature sensors and air pressure sensors.

[0059] Before implementing the data acquisition of this step, determine the sampling frequency, sampling time, etc. of the temperature sensors and air pressure sensors, and then when the battery is charged at a preset charging power with constant power or discharged at a preset discharging power with constant power in a normal temperature environment, the temperature value and air pressure value of the battery are acquired in real time through the temperature sensors and air pressure sensors.

[0060] In this embodiment, the sampling frequency: refers to the number of times the temperature sensors and air pressure sensors collect data per second.

[0061] For example, if the sampling frequencies of both the temperature sensors and air pressure sensors are set to 10Hz, then the temperature sensors will measure the temperature of the battery 10 times per second. At the same time, the air pressure sensors will also measure the air pressure of the battery 10 times and record the corresponding temperature values and air pressure values. At this time, the time interval between two adjacent temperature measurements is 1 / 10 = 0.1 second, and the time interval between two adjacent air pressure measurements is 1 / 10 = 0.1 second.

[0062] That is to say, every 0.1 seconds, the temperature sensor and the barometric pressure sensor will obtain a new set of temperature values and barometric pressure values.

[0063] Sampling time: It refers to the total time elapsed from the start to the end of sampling by the temperature sensor and the barometric pressure sensor.

[0064] For example, if it is set to monitor the temperature and barometric pressure of the battery for 10 minutes, then these 10 minutes are the sampling time. Throughout the sampling time, the temperature sensor and the barometric pressure sensor continuously collect temperature values and barometric pressure values according to the set sampling frequency.

[0065] Current temperature value: It refers to the temperature value newly obtained by the temperature sensor at a certain specific moment.

[0066] For example, in the above example with a sampling frequency of 10Hz, if the current moment is the 5th second, then the current temperature value is the 50th (5×10 = 50) temperature data collected by the temperature sensor at the 5th second. It reflects the instantaneous temperature state of the battery at this moment.

[0067] Previous temperature value: It refers to the temperature value obtained in the previous acquisition before the current temperature value.

[0068] Still taking the sampling frequency of 10Hz as an example, if the current moment is the 5th second, then the previous temperature value is the temperature data collected at the 4.9th second, which is the 49th temperature data. By comparing the current temperature value and the previous temperature value, the change of the battery temperature within a sampling interval can be understood, and then the change trend of the temperature can be analyzed. If the current temperature value is greater than the previous temperature value, it indicates that the battery temperature is rising; otherwise, it indicates that the temperature is falling.

[0069] Current barometric pressure value: Similar to the current temperature value, it refers to the barometric pressure value newly obtained by the barometric pressure sensor at a certain specific moment.

[0070] For example: Still taking the sampling frequency of 10Hz as an example, if the current moment is the 5th second, then the current barometric pressure value is the 50th (5×10 = 50) barometric pressure data collected by the barometric pressure sensor at the 5th second. It reflects the instantaneous barometric pressure magnitude of the battery at this moment.

[0071] Previous barometric pressure value: It refers to the barometric pressure value obtained in the previous acquisition before the current barometric pressure value.

[0072] Still taking the sampling frequency of 10Hz as an example, if the current moment is the 5th second, then the previous barometric pressure value is the barometric pressure data collected at the 4.9th second, which is the 49th barometric pressure data. By comparing the current barometric pressure value and the previous barometric pressure value, the change of the battery barometric pressure within a sampling interval can be understood, which helps to analyze the change trend of the barometric pressure and whether there are abnormal changes.

[0073] S20. Select the standard air pressure value and the lithium plating alarm threshold corresponding to the current temperature value of the battery, and obtain the current air pressure change rate of the battery.

[0074] In this step, based on the specification parameters of the battery in step S10, as well as the obtained current temperature value and air pressure value, select the standard air pressure value and the lithium plating alarm threshold corresponding to the current temperature value of the battery with the same specification parameters, and at the same time obtain the current air pressure change rate of the battery.

[0075] Among them, the current air pressure change rate of the battery is defined as the ratio of the air pressure change amount and the temperature change amount corresponding to the current temperature value and the previous temperature value of the battery.

[0076] It can be understood that the air pressure change amount corresponding to the current temperature value and the previous temperature value of the battery is the difference between the current air pressure value and the previous air pressure value, and the temperature change amount corresponding to the current temperature value and the previous temperature value of the battery is the difference between the current temperature value and the previous temperature value.

[0077] S30. Judge whether the current air pressure value of the battery is less than the standard air pressure value corresponding to the current temperature value. If so, it is determined that the battery is in a normal working state; otherwise, judge whether the current air pressure change rate of the battery is greater than or equal to the lithium plating alarm threshold. If so, it is determined that the battery is in an abnormal working state.

[0078] This step is specifically as follows: Based on the standard air pressure value and the lithium plating alarm threshold corresponding to the current temperature value of the battery selected in step S20, compare the current air pressure value corresponding to the obtained current temperature value with the standard air pressure value. When the current air pressure value of the battery is less than the standard air pressure value corresponding to the current temperature value, it is determined that the battery is in a normal working state; when the current air pressure value of the battery is greater than or equal to the standard air pressure value corresponding to the current temperature value, compare the current air pressure change rate of the battery with the lithium plating alarm threshold. When the current air pressure change rate of the battery is greater than or equal to the lithium plating alarm threshold, it is determined that the battery is in an abnormal working state.

[0079] It can be understood that the standard air pressure value corresponding to the current temperature value of the battery refers to the air pressure value that the battery usually has at the current temperature value when it is in a normal working state. Since the internal air pressure of the battery will change with the temperature fluctuation during normal operation, in order to avoid some potential safety risks from being difficult to be detected in time, the standard air pressure value needs to be set lower to ensure that when it is judged that the current air pressure value of the battery is less than the standard air pressure value corresponding to the current temperature value, it can be accurately determined that the battery is in a normal working state.

[0080] In this embodiment, the conditions for determining that the battery is in an abnormal working state are as follows: the currently obtained air pressure value of the battery is greater than or equal to the standard air pressure value corresponding to the current temperature value, and the current air pressure change rate of the battery is greater than or equal to the lithium plating alarm threshold. That is, when the currently obtained air pressure value of the battery is greater than or equal to the standard air pressure value corresponding to the current temperature value, it is preliminarily determined that the battery is in an abnormal working state. Since the internal air pressure of the battery will change with the temperature fluctuation during normal operation, in order to avoid frequent false alarms, it is necessary to further determine whether the current air pressure change rate of the battery is greater than or equal to the lithium plating alarm threshold.

[0081] Specifically, when lithium plating occurs in the battery, that is, when the battery is in an abnormal working state, there will be an abnormal change in the air pressure value of the battery, that is, the difference between the current air pressure value and the previous air pressure value will be relatively large. And since the difference between the current temperature value and the previous temperature value is relatively small, the ratio of the difference between the current air pressure value and the previous air pressure value to the difference between the current temperature value and the previous temperature value will be relatively large. Therefore, by determining whether the current air pressure change rate of the battery is greater than or equal to the lithium plating alarm threshold, it is possible to more accurately determine whether the battery is likely to undergo lithium plating. Based on these two judgment conditions, it is possible to more accurately determine whether the battery is in an abnormal working state, especially the lithium plating state, thereby improving the accuracy of lithium plating early warning, reducing the probability of misjudgment of battery lithium plating and the maintenance cost caused by misjudgment. At the same time, the influence factor of temperature on air pressure is eliminated, and the standard air pressure value is further set more precisely.

[0082] S40. When it is determined that the battery is in an abnormal working state, a warning signal is issued.

[0083] In this step, when it is determined through step S30 that the battery is in an abnormal working state, a warning signal will be issued to remind the staff to conduct a comprehensive inspection of the battery.

[0084] In this embodiment, the battery being in an abnormal working state specifically includes the battery being in a lithium plating state.

[0085] The battery warning method provided in this embodiment, by obtaining the temperature value and air pressure value of the battery in real time, determines whether the battery is in an abnormal working state based on the standard air pressure value corresponding to the current temperature value of the battery and the lithium plating alarm threshold, and issues a warning when the battery is in an abnormal working state, avoiding the inability to perform mutual verification when using only a single parameter of air pressure or temperature for warning, improving the accuracy of warning, reducing the probability of misjudgment of battery lithium plating and the maintenance cost caused by misjudgment. At the same time, the influence factor of temperature on air pressure is eliminated, and the standard air pressure value is further set more precisely.

[0086] As a preferred embodiment, this embodiment optimizes the selection of the standard air pressure value corresponding to the current temperature value of the battery.

[0087] Specifically, as Figure 2As shown, select the standard air pressure value corresponding to the current temperature value of the battery, specifically including the steps:

[0088] S211. First, use a room-temperature test battery to charge at a room-temperature test charging regime or discharge at a room-temperature test discharging regime in a room-temperature environment, and obtain the temperature value and air pressure value of the room-temperature test battery in real time.

[0089] In this step, based on the preset charging power and preset discharging power described in step S10, when using a room-temperature test battery to perform constant-power charging at a room-temperature test charging power in a room-temperature environment, the temperature value and air pressure value of the room-temperature test battery are obtained in real time through a temperature sensor and an air pressure sensor; or, when using a room-temperature test battery to perform constant-power discharging at a room-temperature test discharging power in a room-temperature environment, the temperature value and air pressure value of the room-temperature test battery are obtained in real time through a temperature sensor and an air pressure sensor.

[0090] S212. Select the air pressure value corresponding to the current temperature value of the room-temperature test battery as the standard air pressure value corresponding to the current temperature value of the battery.

[0091] In this step, based on the temperature value and air pressure value of the room-temperature test battery obtained in real time in step S211, the current temperature value of the room-temperature test battery is extracted, and the air pressure value corresponding to the current temperature value of the room-temperature test battery is selected according to the current temperature value of the room-temperature test battery, and this air pressure value is used as the standard air pressure value corresponding to the current temperature value of the battery.

[0092] In this embodiment, it should be clear that the specifications of the room-temperature test battery are the same as those of the battery, the room-temperature test charging regime is the same as the preset charging regime, the room-temperature test discharging regime is the same as the preset discharging regime, and the current temperature value of the room-temperature test battery is the same as the current temperature value of the battery. Specifically, the room-temperature test charging power is the same as the preset charging power, and the room-temperature test discharging power is the same as the preset discharging power.

[0093] Preferably, in this embodiment, selecting the air pressure value corresponding to the current temperature value of the room-temperature test battery as the standard air pressure value corresponding to the current temperature value of the battery specifically includes the steps:

[0094] S2121. According to the temperature value and air pressure value of the room-temperature test battery, fit to obtain a first linear function relational expression in which the air pressure value and temperature value of the room-temperature test battery are linearly related.

[0095] In this step, the first linear function relational expression in which the air pressure value and temperature value of the room-temperature test battery are linearly related, obtained by fitting, is represented by the following formula:

[0096] P1 = a1 * T1 + b1;

[0097] Among them, T1 represents the temperature value of the battery under normal temperature test, P1 represents the air pressure value corresponding to the temperature value, a1 represents the first slope, and b1 represents the first intercept.

[0098] S2122. According to the first linear function relationship, calculate the air pressure value corresponding to the current temperature value of the battery under normal temperature test as the standard air pressure value corresponding to the battery at the current temperature value.

[0099] In this step, substitute the current temperature value of the battery under normal temperature test into the above first linear function relationship, calculate the air pressure value corresponding to the current temperature value of the battery under normal temperature test, and use this air pressure value as the standard air pressure value corresponding to the battery at the current temperature value.

[0100] As a preferred embodiment of this example, selecting the air pressure value corresponding to the current temperature value of the battery under normal temperature test as the standard air pressure value corresponding to the battery at the current temperature value further includes the steps:

[0101] S2123. Calculate the sum of the air pressure value corresponding to the current temperature value of the battery under normal temperature test and the factory air pressure of the battery as the standard air pressure value corresponding to the battery at the current temperature value.

[0102] In this step, the standard air pressure value corresponding to the battery at the current temperature value can also be calculated by the following formula:

[0103] P 标准 = P0 + a1 * T1 + b1;

[0104] Among them, P0 represents the factory air pressure of the battery, P 标准 represents the standard air pressure value corresponding to the current temperature value, T1 represents the current temperature value of the battery under normal temperature test, a1 represents the first slope, and b1 represents the first intercept.

[0105] In this example, the factory air pressure of the battery is generally 0. Adding the factory air pressure of the battery as a reference can make the standard air pressure value corresponding to the battery at the current temperature value more accurate.

[0106] In some preferred embodiments, selecting the air pressure value corresponding to the current temperature value of the battery under normal temperature test specifically includes the steps:

[0107] Select the minimum air pressure value corresponding to the current temperature value in multiple tests of the battery under normal temperature test as the air pressure value corresponding to the current temperature value of the battery under normal temperature test.

[0108] This step is specifically as follows: During multiple charge and discharge tests of the battery under normal temperature test, continuously and accurately record the temperature value T1 and the corresponding air pressure value P1 during each test. Classify and organize all test data according to the temperature value to form air pressure value data sets corresponding to multiple temperature values.

[0109] For example, after multiple tests, a series of corresponding air pressure values may be obtained for the current temperature value, and then the minimum air pressure value corresponding to the current temperature value is selected as the air pressure value corresponding to the battery under normal temperature test at the current temperature value.

[0110] Through this embodiment, the standard air pressure value corresponding to the battery at the current temperature value is obtained based on the first linear function relationship, and this parameter is used as a reference standard for subsequent judgment of the abnormal working state of the battery, improving the accuracy of lithium deposition warning.

[0111] As a preferred embodiment, this embodiment optimizes the selection process of the lithium deposition alarm threshold.

[0112] Specifically, as Figure 3 shown, selecting the lithium deposition alarm threshold corresponding to the battery at the current temperature value specifically includes the steps:

[0113] S221. First, use a normal temperature test battery to charge at a normal temperature test charging regime or discharge at a normal temperature test discharging regime in a normal temperature environment, and obtain the temperature value and air pressure value of the normal temperature test battery in real time.

[0114] In this step, it should be clear that the specifications of the normal temperature test battery are the same as those of the battery, the normal temperature test charging regime is the same as the preset charging regime, and the normal temperature test discharging regime is the same as the preset discharging regime. Specifically, the normal temperature test charging power is the same as the preset charging power, and the normal temperature test discharging power is the same as the preset discharging power.

[0115] Then, in this step, maintaining the temperature of the normal temperature environment, the temperature value and air pressure value of the normal temperature test battery obtained include: when using a normal temperature test battery to perform constant power charging at a normal temperature test charging power in a normal temperature environment, the temperature value and air pressure value of the normal temperature test battery obtained in real time through a temperature sensor and an air pressure sensor; or, when using a normal temperature test battery to perform constant power discharging at a normal temperature test discharging power in a normal temperature environment, the temperature value and air pressure value of the normal temperature test battery obtained in real time through a temperature sensor and an air pressure sensor.

[0116] S222. First, use a low temperature test battery to charge at a low temperature test charging regime or discharge at a low temperature test discharging regime in a low temperature environment, and obtain the temperature value and air pressure value of the low temperature test battery in real time.

[0117] In this step, it should be clear that the specifications of the low temperature test battery are the same as those of the battery, the low temperature test charging regime is the same as the preset charging regime, and the low temperature test discharging regime is the same as the preset discharging regime. Specifically, the low temperature test charging power is the same as the preset charging power, and the low temperature test discharging power is the same as the preset discharging power.

[0118] Then, in this step, maintain the temperature of the low-temperature environment, and the temperature value and air pressure value of the low-temperature test battery obtained include: when previously using the low-temperature test battery to perform constant-power charging at a low-temperature test charging power in the low-temperature environment, making the negative electrode of the low-temperature test battery reach the lithium precipitation state, during this process, the temperature value and air pressure value of the low-temperature test battery obtained in real time through the temperature sensor and the air pressure sensor; or, when previously using the low-temperature test battery to perform constant-power charging at a low-temperature test charging power in the low-temperature environment, making the negative electrode of the low-temperature test battery reach the lithium precipitation state, during this process, the temperature value and air pressure value of the low-temperature test battery obtained in real time through the temperature sensor and the air pressure sensor, and then when using the low-temperature test battery to perform constant-power discharging at a low-temperature test discharging power in the low-temperature environment, the temperature value and air pressure value of the low-temperature test battery obtained in real time through the temperature sensor and the air pressure sensor.

[0119] S223. Obtain the current air pressure change rate of the normal-temperature test battery and the current air pressure change rate of the low-temperature test battery, and select any value between the current air pressure change rate of the normal-temperature test battery and the current air pressure change rate of the low-temperature test battery as the lithium precipitation alarm threshold corresponding to the battery at the current temperature value.

[0120] In this step, calculate the current air pressure change rate of the normal-temperature test battery based on the temperature value and air pressure value of the normal-temperature test battery obtained through the above step S221.

[0121] Calculate the current air pressure change rate of the low-temperature test battery based on the temperature value and air pressure value of the low-temperature test battery obtained through the above step S222.

[0122] Among them, the current air pressure change rate of the normal-temperature test battery is defined as the ratio of the air pressure change amount and the temperature change amount corresponding to the current temperature value and the previous temperature value of the normal-temperature test battery. The current temperature value of the normal-temperature test battery is the same as the current temperature value of the battery, and the previous temperature value of the normal-temperature test battery is the same as the previous temperature value of the battery.

[0123] The current air pressure change rate of the low-temperature test battery is defined as the ratio of the air pressure change amount and the temperature change amount corresponding to the current temperature value and the previous temperature value of the low-temperature test battery. The current temperature value of the low-temperature test battery is the same as the current temperature value of the battery, and the previous temperature value of the low-temperature test battery is the same as the previous temperature value of the battery.

[0124] As a preferred embodiment of this embodiment, obtain the current air pressure change rate of the normal-temperature test battery and the current air pressure change rate of the low-temperature test battery, and select any value between the current air pressure change rate of the normal-temperature test battery and the current air pressure change rate of the low-temperature test battery as the lithium precipitation alarm threshold corresponding to the battery at the current temperature value. Specifically, it includes the steps:

[0125] According to the temperature value and air pressure value of the battery during normal temperature testing, a first linear function relationship in which the air pressure value and temperature value of the battery during normal temperature testing show a linear relationship is obtained by fitting.

[0126] This first linear function relationship is expressed by the following formula:

[0127] P1 = a1 * T1 + b1;

[0128] Among them, T1 represents the temperature value of the battery during normal temperature testing, P1 represents the air pressure value corresponding to the temperature value, a1 represents the first slope, and b1 represents the first intercept.

[0129] According to the temperature value and air pressure value of the battery during low temperature testing, a second linear function relationship in which the air pressure value and temperature value of the battery during low temperature testing show a linear relationship is obtained by fitting.

[0130] This second linear function relationship is expressed by the following formula:

[0131] P2 = a2 * T2 + b2;

[0132] Among them, T2 represents the temperature value of the battery during low temperature testing, P2 represents the air pressure value corresponding to the temperature value, a2 represents the second slope, and b2 represents the second intercept.

[0133] Between the first slope of the first linear function relationship and the second slope of the second linear function relationship, any value is selected as the lithium plating alarm threshold corresponding to the current temperature value of the battery.

[0134] Specifically, the value range of the lithium plating alarm threshold h is between the first slope and the second slope, that is, h ∈ (a□, a□).

[0135] By selecting this lithium plating alarm threshold h, it can be known that when h ∈ (a□, a□), lithium plating may occur in the battery, that is, the battery may be in an abnormal working state and needs to be repaired.

[0136] As a preferred embodiment of this embodiment, obtaining the current air pressure change rate of the battery during normal temperature testing and the current air pressure change rate of the battery during low temperature testing specifically includes the steps of:

[0137] Select the minimum current air pressure change rate of the battery during normal temperature testing in multiple tests as the current air pressure change rate of the battery during normal temperature testing; select the minimum current air pressure change rate of the battery during low temperature testing in multiple tests as the current air pressure change rate of the battery during low temperature testing.

[0138] Specifically, according to the obtained multiple groups of temperature values and air pressure values of the battery during normal temperature testing, the current air pressure change rates of multiple groups of the battery during normal temperature testing are calculated, and the minimum current air pressure change rate is used as the current air pressure change rate of the battery during normal temperature testing.

[0139] Similarly, based on the temperature values and air pressure values of multiple low-temperature test batteries obtained, the current air pressure change rates of multiple low-temperature test batteries are calculated, and the minimum current air pressure change rate is used as the current air pressure change rate of the low-temperature test battery.

[0140] In this embodiment, one normal-temperature test battery can be used. The single normal-temperature test battery is subjected to constant-power charging at the normal-temperature test charging power or constant-power discharging at the normal-temperature test discharging power in a normal-temperature environment. The temperature value and air pressure value of the normal-temperature test battery are obtained in real time. Based on the temperature value and air pressure value of the normal-temperature test battery, a first linear function relational expression in which the air pressure value and the temperature value of the normal-temperature test battery are linearly related is fitted, and the first slope of the first linear function relational expression is determined. One low-temperature test battery can be used. The single low-temperature test battery is subjected to constant-power charging at the low-temperature test charging power or constant-power discharging at the low-temperature test discharging power in a low-temperature environment. The temperature value and air pressure value of the low-temperature test battery are obtained in real time. Based on the temperature value and air pressure value of the low-temperature test battery, a second linear function relational expression in which the air pressure value and the temperature value of the low-temperature test battery are linearly related is fitted, and the second slope of the second linear function relational expression is determined. Then, any value is selected between the first slope of the first linear function relational expression and the second slope of the second linear function relational expression as the lithium plating alarm threshold corresponding to the current temperature value of the battery.

[0141] In some alternative embodiments, multiple normal-temperature test batteries can be used. The multiple normal-temperature test batteries are subjected to constant-power charging at the normal-temperature test charging power or constant-power discharging at the normal-temperature test discharging power in a normal-temperature environment. The temperature values and air pressure values of multiple groups of normal-temperature test batteries are obtained in real time. Based on the temperature values and air pressure values of multiple groups of normal-temperature test batteries, a first linear function relational expression in which the air pressure values and the temperature values of multiple groups of normal-temperature test batteries are linearly related is fitted, and the first slopes of multiple groups of first linear function relational expressions are determined. The minimum first slope among multiple groups of first slopes is selected as the first slope of the first linear function relational expression. Multiple low-temperature test batteries can be used. The multiple low-temperature test batteries are subjected to constant-power charging at the low-temperature test charging power or constant-power discharging at the low-temperature test discharging power in a low-temperature environment. The temperature values and air pressure values of multiple groups of low-temperature test batteries are obtained in real time. Based on the temperature values and air pressure values of multiple groups of low-temperature test batteries, a second linear function relational expression in which the air pressure values and the temperature values of multiple groups of low-temperature test batteries are linearly related is fitted, and the second slopes of multiple groups of second linear function relational expressions are determined. The minimum second slope among multiple groups of second slopes is selected as the second slope of the second linear function relational expression. Then, any value is selected between the first slope of the first linear function relational expression and the second slope of the second linear function relational expression as the lithium plating alarm threshold corresponding to the current temperature value of the battery.

[0142] In this embodiment, the temperature range of the normal temperature environment is set from 20°C to 30°C; the temperature range of the low temperature environment is set from -5°C to -15°C.

[0143] Preferably, the temperature selected for the normal temperature environment in this embodiment is 25°C; the temperature selected for the low temperature environment in this embodiment is -10°C.

[0144] In this embodiment, when the battery is charged at a constant power of 0.5P in the normal temperature environment, the normal temperature test battery is charged at a constant power of 0.5P in the normal temperature environment; the low temperature test battery is charged at a constant power of 0.5P in the low temperature environment. When the battery is discharged at a constant power of 0.5P in the normal temperature environment, the normal temperature test battery is discharged at a constant power of 0.5P in the normal temperature environment; the low temperature test battery is discharged at a constant power of 0.5P in the low temperature environment.

[0145] In some alternative implementation manners, the embodiment of the present invention further provides a battery warning system.

[0146] As Figure 4 shown, the battery warning system includes: a data acquisition module 100, a data processing module 200, a determination module 300, and a warning module 400. The data acquisition module 100, the data processing module 200, the determination module 300, and the warning module 400 are communicatively connected.

[0147] Among them, the data acquisition module 100 is used to obtain the temperature value and air pressure value of the battery in real time during charging or discharging, and send the temperature value and air pressure value to the data processing module 200 and the determination module 300.

[0148] Specifically, when the battery is charged according to a preset charging regime or discharged according to a preset discharging regime in the normal temperature environment, the data acquisition module 100 obtains the temperature value and air pressure value of the battery in real time, and sends the temperature value and air pressure value to the data processing module 200 and the determination module 300.

[0149] The data acquisition module 100 includes a temperature sensor and an air pressure sensor.

[0150] The data processing module 200 is used to select the standard air pressure value and the lithium plating alarm threshold corresponding to the current temperature value of the battery, obtain the current air pressure change rate of the battery, and send it to the determination module 300.

[0151] Specifically, the specific implementation process of the data processing module 200 for selecting the standard air pressure value corresponding to the current temperature value of the battery is:

[0152] Previously, a normal-temperature test battery is charged under a normal-temperature test charging regime or discharged under a normal-temperature test discharging regime in a normal-temperature environment, and the temperature value and air pressure value of the normal-temperature test battery are obtained in real time; the data processing module 200 selects the air pressure value corresponding to the current temperature value of the normal-temperature test battery as the standard air pressure value corresponding to the current temperature value of the battery.

[0153] Among them, the specifications of the normal-temperature test battery are the same as those of the battery, the normal-temperature test charging regime is the same as the preset charging regime, the normal-temperature test discharging regime is the same as the preset discharging regime, and the current temperature value of the normal-temperature test battery is the same as the current temperature value of the battery.

[0154] The specific implementation process for the data processing module 200 to select the lithium plating alarm threshold corresponding to the current temperature value of the battery is as follows:

[0155] Previously, a normal-temperature test battery is charged under a normal-temperature test charging regime or discharged under a normal-temperature test discharging regime in a normal-temperature environment, and the temperature value and air pressure value of the normal-temperature test battery are obtained in real time.

[0156] Previously, a low-temperature test battery is charged under a low-temperature test charging regime or discharged under a low-temperature test discharging regime in a low-temperature environment, and the temperature value and air pressure value of the low-temperature test battery are obtained in real time.

[0157] Obtain the current air pressure change rate of the normal-temperature test battery and the current air pressure change rate of the low-temperature test battery, and select any value between the current air pressure change rate of the normal-temperature test battery and the current air pressure change rate of the low-temperature test battery as the lithium plating alarm threshold corresponding to the current temperature value of the battery.

[0158] Among them, the current air pressure change rate of the normal-temperature test battery is defined as the ratio of the air pressure change amount and temperature change amount corresponding to the current temperature value and the previous temperature value of the normal-temperature test battery. The specifications of the normal-temperature test battery are the same as those of the battery, the normal-temperature test charging regime is the same as the preset charging regime, the normal-temperature test discharging regime is the same as the preset discharging regime, the current temperature value of the normal-temperature test battery is the same as the current temperature value of the battery, and the previous temperature value of the normal-temperature test battery is the same as the previous temperature value of the battery.

[0159] The current air pressure change rate of the low-temperature test battery is defined as the ratio of the air pressure change amount and temperature change amount corresponding to the current temperature value and the previous temperature value of the low-temperature test battery. The specifications of the low-temperature test battery are the same as those of the battery, the low-temperature test charging regime is the same as the preset charging regime, the low-temperature test discharging regime is the same as the preset discharging regime, the current temperature value of the low-temperature test battery is the same as the current temperature value of the battery, and the previous temperature value of the low-temperature test battery is the same as the previous temperature value of the battery.

[0160] The determination module 300 is used to determine whether the current air pressure value of the battery is less than the standard air pressure value corresponding to the current temperature value, and whether the current air pressure change rate of the battery is greater than or equal to the lithium deposition warning threshold, so as to determine whether the battery is in an abnormal working state, and send the determination result that the battery is in an abnormal working state to the warning module 400.

[0161] Specifically, based on the standard air pressure value and the lithium deposition warning threshold corresponding to the current temperature value of the battery selected by the data processing module 200, the determination module 300 compares the current air pressure value corresponding to the current temperature value obtained by the data acquisition module 100 with the standard air pressure value. When the current air pressure value of the battery is less than the standard air pressure value corresponding to the current temperature value, it is determined that the battery is in a normal working state. When the current air pressure value of the battery is greater than or equal to the standard air pressure value corresponding to the current temperature value, the current air pressure change rate of the battery is compared with the lithium deposition warning threshold. When the current air pressure change rate of the battery is greater than or equal to the lithium deposition warning threshold, it is determined that the battery is in an abnormal working state.

[0162] The warning module 400 is used to send a warning signal.

[0163] Specifically, when the determination module 300 determines that the battery is in an abnormal working state, the warning module 400 will send a warning signal to remind the staff to conduct a comprehensive inspection of the battery.

[0164] In this embodiment, for the specific process of the data acquisition module 100 of the battery warning system to obtain the temperature value and air pressure value of the battery during charging or discharging, refer to the process of obtaining the temperature value and air pressure value of the battery in the above battery warning method, and this embodiment will not repeat it.

[0165] For the selection process of the standard air pressure value and the lithium deposition warning threshold corresponding to the current temperature value of the battery selected by the data processing module 200, refer to the selection process of the standard air pressure value and the lithium deposition warning threshold corresponding to the current temperature value of the battery in the above battery warning method. For the calculation process of the current air pressure change rate of the battery, refer to the calculation process of the current air pressure change rate of the battery in the above battery warning method, and this embodiment will not repeat it.

[0166] For the determination process of the normal working state or abnormal working state of the battery by the determination module 300, refer to the determination process of the normal working state or abnormal working state of the battery in the above battery warning method, and this embodiment will not repeat it.

[0167] The battery warning system provided by the present invention obtains the temperature value and air pressure value of the battery in real time through the data acquisition module 100. Based on the standard air pressure value and the lithium plating alarm threshold corresponding to the current temperature value of the battery selected by the data processing module 200, the determination module 300 determines whether the battery is in an abnormal working state, and when the battery is in an abnormal working state, the warning module 400 gives a warning, avoiding the inability to perform mutual verification when using a single parameter of air pressure or temperature alone, improving the accuracy of lithium plating warning, reducing the misjudgment probability of battery lithium plating and the maintenance cost caused by misjudgment, and at the same time eliminating the influence factor of temperature on air pressure, and further setting the standard air pressure value more accurately.

[0168] In the specification provided herein, a large number of specific details are set forth. It will be understood, however, that embodiments of the invention may be practiced without these specific details. Similarly, in order to streamline the present invention and assist in understanding one or more of the various inventive aspects, in the above description of the exemplary embodiments of the present invention, the various features of the embodiments of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. Among them, the claims following the specific implementation manner are hereby expressly incorporated into the specific implementation manner, and each claim itself is a separate embodiment of the present invention.

[0169] Those skilled in the art will appreciate that the modules in the devices in the embodiments can be adaptively changed and disposed in one or more devices different from the embodiments. The modules or units or components in the embodiments can be combined into a module or unit or component, and in addition, they can be divided into multiple sub-modules or sub-units or sub-components. Except that at least some of such features and / or processes or units are mutually exclusive.

[0170] It should be noted that the above embodiments illustrate the present invention rather than limit the present invention, and those skilled in the art can design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention can be implemented by means of hardware including several different elements and by means of a suitably programmed computer. In the unit claims listing several devices, several of these devices may be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not denote any order. These words can be interpreted as names. The steps in the above embodiments, unless otherwise specified, should not be construed as limiting the order of execution.

Claims

1. A battery warning method, characterized in that, Including the steps: When the battery is charged with a preset charging regime or discharged with a preset discharging regime in a normal temperature environment, the temperature value and air pressure value of the battery are acquired in real time; Select the standard air pressure value and lithium plating alarm threshold corresponding to the current temperature value of the battery, and acquire the current air pressure change rate of the battery; Judge whether the current air pressure value of the battery is less than the standard air pressure value corresponding to the current temperature value. If so, it is determined that the battery is in a normal working state. Otherwise, judge whether the current air pressure change rate of the battery is greater than or equal to the lithium plating alarm threshold. If so, it is determined that the battery is in an abnormal working state; When it is determined that the battery is in an abnormal working state, a warning signal is issued; Wherein, the current air pressure change rate of the battery is defined as the ratio of the air pressure change amount and temperature change amount corresponding to the current temperature value and the previous temperature value of the battery; 2. The battery warning method according to claim 1, characterized in that Selecting the standard air pressure value corresponding to the current temperature value of the battery specifically includes the steps: Previously, use a normal temperature test battery to charge with a normal temperature test charging regime or discharge with a normal temperature test discharging regime in a normal temperature environment, and acquire the temperature value and air pressure value of the normal temperature test battery in real time; Select the air pressure value corresponding to the current temperature value of the normal temperature test battery as the standard air pressure value corresponding to the current temperature value of the battery; Wherein, the specifications of the normal temperature test battery are the same as those of the battery, the normal temperature test charging regime is the same as the preset charging regime, the normal temperature test discharging regime is the same as the preset discharging regime, and the current temperature value of the normal temperature test battery is the same as the current temperature value of the battery; 3. The battery warning method according to claim 2, characterized in that, Selecting the air pressure value corresponding to the current temperature value of the normal temperature test battery as the standard air pressure value corresponding to the current temperature value of the battery specifically includes the steps: According to the temperature value and air pressure value of the normal temperature test battery, fit to obtain a first linear function relational expression in which the air pressure value and temperature value of the normal temperature test battery are linearly related; According to the first linear function relational expression, calculate the air pressure value corresponding to the current temperature value of the normal temperature test battery as the standard air pressure value corresponding to the current temperature value of the battery; 4. A battery warning method according to claim 2, characterized in that Selecting the air pressure value corresponding to the current temperature value of the normal temperature test battery as the standard air pressure value corresponding to the current temperature value of the battery further includes the steps: Calculate the sum of the air pressure value corresponding to the current temperature value of the normal temperature test battery and the factory air pressure of the battery as the standard air pressure value corresponding to the current temperature value of the battery; 5. A battery warning method according to claim 2, characterized in that, Selecting the air pressure value corresponding to the current temperature value of the normal temperature test battery specifically includes the steps: Select the minimum air pressure value corresponding to the current temperature value in multiple tests of the normal temperature test battery as the air pressure value corresponding to the current temperature value of the normal temperature test battery; 6. The battery warning method according to claim 1, wherein Selecting the lithium plating alarm threshold corresponding to the current temperature value of the battery specifically includes the steps: Previously, use a normal temperature test battery to charge with a normal temperature test charging regime or discharge with a normal temperature test discharging regime in a normal temperature environment, and acquire the temperature value and air pressure value of the normal temperature test battery in real time; Previously, use a low temperature test battery to charge with a low temperature test charging regime or discharge with a low temperature test discharging regime in a low temperature environment, and acquire the temperature value and air pressure value of the low temperature test battery in real time; Obtain the current air pressure change rate of the normal temperature test battery and the current air pressure change rate of the low temperature test battery, and select any value between the current air pressure change rate of the normal temperature test battery and the current air pressure change rate of the low temperature test battery as the lithium plating alarm threshold corresponding to the battery at the current temperature value; Among them, the current air pressure change rate of the normal temperature test battery is defined as the ratio of the air pressure change amount and the temperature change amount corresponding to the normal temperature test battery at the current temperature value and the previous temperature value. The specifications of the normal temperature test battery are the same as those of the battery, the normal temperature test charging system is the same as the preset charging system, the normal temperature test discharging system is the same as the preset discharging system, the current temperature value of the normal temperature test battery is the same as the current temperature value of the battery, and the previous temperature value of the normal temperature test battery is the same as the previous temperature value of the battery; The current air pressure change rate of the low temperature test battery is defined as the ratio of the air pressure change amount and the temperature change amount corresponding to the low temperature test battery at the current temperature value and the previous temperature value. The specifications of the low temperature test battery are the same as those of the battery, the low temperature test charging system is the same as the preset charging system, the low temperature test discharging system is the same as the preset discharging system, the current temperature value of the low temperature test battery is the same as the current temperature value of the battery, and the previous temperature value of the low temperature test battery is the same as the previous temperature value of the battery.

7. The battery warning method according to claim 6, wherein, Obtain the current air pressure change rate of the normal temperature test battery and the current air pressure change rate of the low temperature test battery, and select any value between the current air pressure change rate of the normal temperature test battery and the current air pressure change rate of the low temperature test battery as the lithium plating alarm threshold corresponding to the battery at the current temperature value, which specifically includes the steps of: According to the temperature value and air pressure value of the normal temperature test battery, fit to obtain the first linear function relational expression in which the air pressure value of the normal temperature test battery has a linear relationship with the temperature value; According to the temperature value and air pressure value of the low temperature test battery, fit to obtain the second linear function relational expression in which the air pressure value of the low temperature test battery has a linear relationship with the temperature value; Select any value between the first slope of the first linear function relational expression and the second slope of the second linear function relational expression as the lithium plating alarm threshold corresponding to the battery at the current temperature value.

8. A battery warning method according to claim 6, characterized in that, Obtain the current air pressure change rate of the normal temperature test battery and the current air pressure change rate of the low temperature test battery, which specifically includes the steps of: Select the minimum current air pressure change rate of the normal temperature test battery in multiple tests as the current air pressure change rate of the normal temperature test battery; Select the minimum current air pressure change rate of the low temperature test battery in multiple tests as the current air pressure change rate of the low temperature test battery.

9. A battery warning method according to claim 1, characterized in that, Obtain the temperature value and air pressure value of the battery in real time, which specifically includes the steps of: Obtain the temperature value and air pressure value of the battery in real time through the temperature sensor and air pressure sensor installed in the battery.

10. A battery warning system, characterized in that, Include: A data acquisition module, a data processing module, a determination module, and an early warning module, and the data acquisition module, the data processing module, the determination module, and the early warning module are communicatively connected; The data acquisition module is used to obtain the temperature value and air pressure value of the battery during charging or discharging in real time, and send the temperature value and air pressure value to the data processing module and the determination module; The data processing module is used to select the standard air pressure value and the lithium plating alarm threshold corresponding to the current temperature value of the battery, obtain the current air pressure change rate of the battery and send it to the determination module; The determination module is used to judge whether the current air pressure value of the battery is less than the standard air pressure value corresponding to the current temperature value, and whether the current air pressure change rate of the battery is greater than or equal to the lithium plating alarm threshold, so as to determine whether the battery is in an abnormal working state, and send the determination result that the battery is in an abnormal working state to the warning module; The warning module is used to send out a warning signal.

Images