CN115951235A - Charge state early warning method and device and vehicle - Google Patents
Charge state early warning method and device and vehicle Download PDFInfo
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Abstract
The disclosure relates to a state of charge early warning method, a device and a vehicle, which relate to the field of battery safety, and the method comprises the following steps: the method comprises the steps of acquiring multiple groups of sample data acquired in set unit time, acquiring a first charge state corresponding to the highest voltage Vmax and a second charge state corresponding to the lowest voltage Vmin in each group of sample data, acquiring the difference value between the first charge state and the second charge state of each sample data, determining a charge state reference value in unit time according to the charge state difference values of the multiple groups of sample data, and outputting alarm information under the condition that the charge state reference values in continuous multiple unit times are larger than a set charge state threshold value. Through the technical scheme, whether potential safety hazards exist in the battery system can be identified based on the charge state of the battery system, early warning is carried out, and certain guarantee is provided for the safety of the battery system.
Description
Technical Field
The disclosure relates to the field of battery safety, in particular to a state of charge early warning method, a state of charge early warning device and a vehicle.
Background
Along with the popularization of new energy automobiles, the battery safety of the new energy automobiles also becomes a problem which needs to be paid attention urgently, the safety problem of the battery can be gradually developed from a tiny problem to a serious problem along with the long-term and tired use, and therefore the hidden danger of monitoring the battery safety and identifying the battery safety in advance becomes a problem which needs to be solved urgently.
Disclosure of Invention
The purpose of the disclosure is to provide a state of charge early warning method, a state of charge early warning device and a vehicle, which are used for solving the problem of warning when potential safety hazards occur to a battery.
In order to achieve the above object, in a first aspect of the present disclosure, a state of charge warning method is provided, which is applied to a vehicle, and includes:
acquiring multiple groups of sample data acquired in set unit time, wherein the sample data comprises the highest voltage Vmax and the lowest voltage Vmin of a battery cell of a battery system of the vehicle acquired under the condition that the vehicle meets set conditions;
acquiring a first charge state corresponding to the highest voltage Vmax and a second charge state corresponding to the lowest voltage Vmin in each group of sample data;
acquiring the state of charge difference values of the multiple groups of sample data, wherein the state of charge difference value of each group of sample data is the difference value between the first state of charge and the second state of charge;
determining a state of charge reference value in the unit time according to the state of charge difference values of the multiple groups of sample data;
and under the condition that the continuous plurality of the state of charge reference values in the unit time are larger than the set state of charge threshold value, alarm information is output.
Optionally, the obtaining a first state of charge corresponding to the highest voltage Vmax and a second state of charge corresponding to the lowest voltage Vmin in each set of sample data includes:
acquiring a first open-circuit voltage corresponding to the highest voltage Vmax and a second open-circuit voltage corresponding to the lowest voltage Vmin in each group of sample data;
and acquiring a first charge state corresponding to the first open-circuit voltage and a second charge state corresponding to the second open-circuit voltage of each group of sample data.
Optionally, the setting condition includes:
the battery system reaches a quasi-static working condition, the battery system keeps the quasi-static working condition for exceeding a set time, and the highest voltage of the battery cell of the battery system at the last moment of the quasi-static working condition is smaller than a set voltage.
Optionally, the quasi-static operating condition is that an absolute value of a current of the battery system is smaller than a set absolute value of the current.
Optionally, the obtaining a first open-circuit voltage corresponding to the highest voltage Vmax and a second open-circuit voltage corresponding to the lowest voltage Vmin in each set of sample data includes:
for each group of sample data, calculating a first open-circuit voltage corresponding to the highest voltage Vmax and a second open-circuit voltage corresponding to the lowest voltage Vmin according to the corresponding relation between the state of charge and the open-circuit voltage; the corresponding relationship comprises the charge states corresponding to a plurality of open-circuit voltages.
Optionally, the obtaining a first state of charge corresponding to the first open circuit voltage and a second state of charge corresponding to the second open circuit voltage of each set of sample data includes:
and for each group of sample data, determining a first charge state corresponding to the first open-circuit voltage and determining a second charge state corresponding to the second open-circuit voltage according to the corresponding relation between the charge states and the open-circuit voltages.
Optionally, the determining the state of charge reference value in the unit time according to the state of charge difference values of the multiple sets of sample data includes:
and acquiring characteristic numerical values of the state of charge difference values of the multiple groups of sample data as the state of charge reference values.
Optionally, the method further comprises:
acquiring multiple groups of sample data acquired in next set unit time, and according to the multiple groups of sample data acquired in the next set unit time, re-executing the steps from acquiring a first state of charge corresponding to the highest voltage Vmax and a second state of charge corresponding to the lowest voltage Vmin in each group of sample data to determining a state of charge reference value according to state of charge difference values of the multiple groups of sample data so as to update the state of charge reference value.
Optionally, the alarm information includes:
the n charge state difference values, the recording time of the charge state difference values and the information of the cell monomer with the lowest open-circuit voltage.
In a second aspect of the present disclosure, a state of charge early warning device is provided, which is applied to a vehicle, and includes:
the data acquisition module is used for acquiring multiple groups of sample data acquired in set unit time, wherein the sample data comprises the highest voltage Vmax and the lowest voltage Vmin of a battery cell of a battery system of the vehicle, which are acquired under the condition that the vehicle meets set conditions;
the charge state acquisition module is used for acquiring a first charge state corresponding to the highest voltage Vmax and a second charge state corresponding to the lowest voltage Vmin in each group of sample data;
the difference value acquisition module is used for acquiring the state of charge difference values of the multiple groups of sample data, wherein the state of charge difference value of each group of sample data is the difference value between the first state of charge and the second state of charge;
the reference value determining module is used for determining the state of charge reference value in the unit time according to the state of charge difference values of the multiple groups of sample data;
and the alarm module is used for outputting alarm information under the condition that the continuous charge state reference values in a plurality of unit time are greater than the set charge state threshold value.
In a third aspect of the present disclosure, a vehicle is provided, which is capable of implementing the steps of the state of charge warning method in any one of the first aspect.
In the technical scheme, multiple sets of sample data collected in a set unit time are obtained, the sample data includes a highest voltage Vmax and a lowest voltage Vmin of a battery core of a battery system of a vehicle collected under the condition that the vehicle meets a set condition, a first state of charge corresponding to the highest voltage Vmax and a second state of charge corresponding to the lowest voltage Vmin in each set of sample data are obtained, state of charge differences of the multiple sets of sample data are obtained, the state of charge difference of each set of sample data is a difference between the first state of charge and the second state of charge, a state of charge reference value in the unit time is determined according to the state of charge differences of the multiple sets of sample data, and alarm information is output under the condition that the state of charge reference values in continuous multiple unit times are larger than a set state of charge threshold. Through the technical scheme, the state of charge of the battery system of the vehicle is monitored, the safety of the battery can be identified through the state of charge of the battery system, alarm information is output under the condition that the state of charge is abnormal, whether potential safety hazards exist in the battery system can be identified based on the state of charge of the battery system, early warning is carried out, and the safety of the battery system is guaranteed to a certain extent.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
fig. 1 is a flowchart illustrating a state of charge warning method according to an exemplary embodiment of the present disclosure.
FIG. 2a is a schematic SOC-OCV diagram shown in accordance with an exemplary embodiment of the present disclosure.
Fig. 2b is a flowchart illustrating yet another state of charge warning method according to an exemplary embodiment of the present disclosure.
Fig. 3 is a block diagram of a state of charge warning device according to an exemplary embodiment.
Fig. 4 is a block diagram of an electronic device for a state of charge warning method according to an exemplary embodiment.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
It is understood that "a plurality" in this disclosure means two or more, and other words are analogous. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. The singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It will be further understood that the terms "first," "second," and the like are used to describe various information and that such information should not be limited by these terms. These terms are only used to distinguish one type of information from another, and do not indicate a particular order or degree of importance. Indeed, the terms "first," "second," and the like are fully interchangeable. For example, the first state of charge may also be referred to as a second state of charge, and similarly, the second state of charge may also be referred to as a first state of charge, without departing from the scope of the present disclosure.
It is further to be understood that while operations are depicted in the drawings in a particular order, this is not to be understood as requiring that such operations be performed in the particular order shown or in serial order, or that all illustrated operations be performed, to achieve desirable results. In certain environments, multitasking and parallel processing may be advantageous.
It should be noted that all actions of acquiring signals, information or data in the present disclosure are performed under the premise of complying with the corresponding data protection regulation policy of the country of the location and obtaining the authorization given by the owner of the corresponding device.
With the development of science and technology, the development of social life and economy is affected, and common new energy batteries include lithium ion batteries, nickel-metal hydride batteries, fuel batteries, lead-acid batteries and the like. The lithium ion battery is the mainstream of the current new energy battery and generally comprises a ternary lithium battery, a lithium iron phosphate battery and a lithium titanate battery.
With the popularization Of new energy batteries, the applicant finds that the new energy batteries are used in daily life due to day-by-day and consistency problems Of the batteries in a battery system, that the SOC (State Of Charge), the capacity, the internal resistance and the like Of the batteries are different, and that the consistency difference Of the batteries due to application environment differences (such as temperature, charging and discharging current) in the grouping application process is increased, so that the inconsistency Of the batteries is aggravated. In an ideal state, the SOC of each battery cell in the battery system is the same, all the battery cells synchronously reach the upper and lower voltage limit values of charging and discharging, and the available capacity of the battery pack is increased. However, in practical situations, since the SOC of a battery with inconsistent self-discharge varies greatly after a period of time, thereby seriously affecting the capacity and safety of the battery, the battery with excessively large SOC variation needs to be corrected. Therefore, the scheme provides a charge state early warning method for solving the technical problem.
Fig. 1 is a flowchart illustrating a state of charge warning method according to an exemplary embodiment of the present disclosure, where the state of charge warning method, as shown in fig. 1, applied to a vehicle may include the following steps.
In step S101, a plurality of sets of sample data acquired within a set unit time are acquired, where the sample data includes a maximum voltage Vmax and a minimum voltage Vmin of a battery cell of a battery system of a vehicle acquired when the vehicle satisfies a set condition.
It is understood that the set unit time may be in units of days, i.e., one unit time is one day, and steps S101 to S104 may be performed every day, and step S105 may be performed according to the result of performing steps S101 to S104 for consecutive days. The unit time may be a longer or shorter time than one day, and may be set according to actual needs. When sample data is collected, abnormal voltage data can be filtered, for example, the voltage value is 0, the voltage value is too high or the voltage value is too low, and the like. Also, since in a battery system of a vehicle, there are a plurality of cells, for example, a lithium iron phosphate battery of 48v20a may require 11 cells for assembly. Therefore, in a battery system of a vehicle, the highest voltage Vmax and the lowest voltage Vmin in all the battery cells may be collected, for example, if there are 20000 battery cells in a certain battery system, where the battery cell with the highest voltage Vmax is No. 2 battery cell, the corresponding highest voltage Vmax is 3.8V, the battery cell with the lowest voltage Vmin is No. 10 battery cell, and the corresponding lowest voltage Vmin is 3.2V, the collected battery cell with the battery system of the vehicle has the highest voltage Vmax of 3.8V and the collected lowest voltage Vmin of 3.2V.
Alternatively, in step S101, the setting condition may include:
the battery system reaches a quasi-static working condition, the battery system keeps the quasi-static working condition for more than a set time, and the highest voltage of the battery cell of the battery system at the last moment of the quasi-static working condition is less than a set voltage.
Optionally, the quasi-static operating condition is that the absolute value of the current of the battery system is smaller than a set absolute value of the current.
It can be understood that, in order to make the data collected in the battery system have a reference value, in the embodiment of the disclosure, the sample data is collected after the battery system of the vehicle reaches the quasi-static working condition; wherein, the condition of judging that the battery system enters the quasi-static working condition is as follows: the absolute value of the current in the battery system is smaller than the set absolute value of the current, and the power of the battery system is smaller than the set power.
For example, when the absolute value of the current is set to be 10A, the power is set to be 300W, the set time duration is 15 minutes, and the set voltage is 3.29V, if the absolute value of the current in the battery system at a certain time is 5A, the power is 200W, the state is maintained for more than 15 minutes, and the cell voltage in the battery system at the last time is 3.25V, then the battery system may be considered to be in a quasi-static operating condition during the time, and the sample data collected at this time may be used for determining the state of charge of the battery system.
In step S102, a first state of charge corresponding to the highest voltage Vmax and a second state of charge corresponding to the lowest voltage Vmin in each set of sample data are obtained.
It is understood that in a vehicle battery system, different voltages correspond to different states of charge, for example, when the voltage is 3.5V, the state of charge of the battery may be 60%. In the embodiment of the present disclosure, the corresponding open-circuit voltage may be determined according to the maximum voltage Vmax and the minimum voltage Vmin, and then the corresponding state of charge may be determined according to the open-circuit voltage.
In step S103, state of charge differences of multiple sets of sample data are obtained, where the state of charge difference of each set of sample data is a difference between the first state of charge and the second state of charge.
The multiple sets of sample data may be multiple sets of data acquired within a certain time, for example, within a day, the maximum voltage Vmax and the minimum voltage Vmin of the battery system are acquired once every time the vehicle meets the setting condition, so as to obtain multiple sets of the maximum voltage Vmax and the minimum voltage Vmin of the battery system, and the first charge state and the second charge state of the corresponding set can be determined according to each set of the maximum voltage Vmax and the minimum voltage Vmin. Therefore, the plurality of sets of sample data correspond to a plurality of sets of differences between the first state of charge and the second state of charge.
In step S104, a state of charge reference value in a unit time is determined according to the state of charge difference values of the multiple sets of sample data.
For example, it is worth mentioning that in order to improve the early warning reliability, some terminal data with lower reference value need to be ignored, and the erroneous determination phenomenon caused by too large or too small state of charge difference at a certain time is reduced, so that a difference in a normal fluctuation range needs to be selected as a state of charge reference value from the state of charge differences of multiple sets of sample data. For example, in a plurality of sets of state of charge difference data within a fixed time, the majority of the state of charge difference data is 25%, and the minority is 5%,70%, etc., the state of charge reference value of the time period gets a median of 25% after removing the extreme data.
According to the method shown in the above steps S101 to S104, the steps S101 to S104 are repeatedly executed in a plurality of continuous unit times, so that the state of charge reference values in a plurality of continuous unit times can be obtained, and the step S105 is executed according to the state of charge reference values in a plurality of continuous unit times.
In step S105, when the state of charge reference values for a plurality of consecutive unit times are greater than the set state of charge threshold value, alarm information is output.
It can be understood that, in a unit time, if a plurality of consecutive state of charge reference values are greater than the state of charge threshold value, it is indicated that the difference between the states of charge of the battery systems is too large, and at this time, a greater safety problem may exist in the battery systems, and at this time, an alarm message is output for reminding a relevant organization or a relevant person to check and correct the states of charge of the battery systems.
In the technical scheme, multiple sets of sample data acquired in a set unit time are acquired, the sample data includes a highest voltage Vmax and a lowest voltage Vmin of a battery core of a battery system of the vehicle acquired under the condition that the vehicle meets a set condition, a first state of charge corresponding to the highest voltage Vmax and a second state of charge corresponding to the lowest voltage Vmin in each set of sample data are acquired, state of charge differences of the multiple sets of sample data are acquired, the state of charge difference of each set of sample data is a difference between the first state of charge and the second state of charge, a state of charge reference value in the unit time is determined according to the state of charge differences of the multiple sets of sample data, and alarm information is output under the condition that the state of charge reference values in continuous multiple unit times are larger than a set state of charge threshold. According to the technical scheme, the charge state of the battery system of the vehicle is monitored, the safety of the battery can be identified through the charge state of the battery system, alarm information is output under the condition that the charge state is abnormal, whether potential safety hazards exist in the battery system can be identified based on the charge state of the battery system, early warning is carried out, and the safety of the battery system is guaranteed to a certain extent.
Fig. 2a is a schematic diagram of an SOC-OCV according to an exemplary embodiment of the disclosure, as shown in fig. 2a, an SOC corresponding to a highest voltage Vmax is a first state of charge, an SOC corresponding to a lowest voltage Vmin is a second state of charge, the highest voltage Vmax and the lowest voltage Vmin are maximum values and minimum values obtained from voltages of all battery cells in a battery system at each time after entering a quasi-static operating condition each time in a unit time, and a difference value between the states of charge corresponding to the highest voltage Vmax and the lowest voltage Vmin is a state of charge difference value at the time, which represents a difference degree between the battery cells at the time.
Optionally, fig. 2b is a flowchart illustrating another state of charge warning method according to an exemplary embodiment of the disclosure, and as shown in fig. 2b, the step S102 may further include the following steps:
in step S1021, a first open-circuit voltage corresponding to the highest voltage Vmax and a second open-circuit voltage corresponding to the lowest voltage Vmin in each set of sample data are obtained.
In step S1022, a first state of charge corresponding to the first open-circuit voltage and a second state of charge corresponding to the second open-circuit voltage of each set of sample data are obtained.
Optionally, step S1021 may further include:
for each group of sample data, calculating a first open-circuit voltage corresponding to the highest voltage Vmax and a second open-circuit voltage corresponding to the lowest voltage Vmin according to the corresponding relation between the state of charge and the open-circuit voltage; the corresponding relationship includes states of charge corresponding to a plurality of open circuit voltages.
Optionally, step S1022 may further include:
and for each group of sample data, determining a first charge state corresponding to the first open-circuit voltage and determining a second charge state corresponding to the second open-circuit voltage according to the corresponding relation between the charge states and the open-circuit voltages.
The corresponding relationship between the state of charge and the Open-Circuit Voltage may be an SOC-OCV table, and it is understood that, for the battery system, the SOC-OCV table may be pre-established, where the OCV is an Open-Circuit Voltage (Open Circuit Voltage) used for querying the Open-Circuit Voltage according to the Voltage and querying the state of charge according to the Open-Circuit Voltage, for example, when the Voltage is 3.5V, the Open-Circuit Voltage is 3.7V, and the corresponding state of charge is 80%. In combination with the SOC-OCV table recorded with the corresponding relationship between the state of charge and the open-circuit voltage, the values of the first open-circuit voltage and the second open-circuit voltage can be calculated by linear interpolation according to the maximum voltage Vmax or the minimum voltage Vmin, for example, in an OCV self-discharge table in the SOC-OCV table, when the voltage is 3.7V, the open-circuit voltage is 4.2V, and when the voltage is 3.2V, the open-circuit voltage is 3.8V, and therefore, when the maximum voltage Vmax is 3.5V, the corresponding open-circuit voltage is calculated by the linear interpolation method and is 4.04V; from the SOC-OCV table, the corresponding state of charge is 65% when the open circuit voltage is 4.04V. The specific data of the voltage, the open-circuit voltage and the state of charge are exemplary, and in an actual scene, the data recorded in the SOC-OCV table of different vehicles and different types of new energy batteries may be different.
Optionally, step S104 may include: and acquiring characteristic numerical values of the state of charge difference values of a plurality of groups of sample data as state of charge reference values.
It is worth mentioning that in order to improve the early warning reliability, some terminal data with lower reference value need to be ignored, and the erroneous judgment phenomenon caused by too large or too small difference value of the state of charge at a certain time is reduced, so that the difference value within the normal fluctuation range needs to be selected as the reference value of the state of charge in the state of charge difference values of multiple groups of sample data. For example, in a plurality of sets of state of charge difference data within a fixed time, most of the data appears 25%, and the small part of the data appears 5%,70%, then after the data at the extreme end is removed in the time period, 25% of a median of the state of charge differences is obtained as a state of charge reference value; alternatively, in another possible implementation, a weighted average of a plurality of state of charge differences may also be selected as the state of charge reference value. The weight of the weighted average can be determined according to actual needs, for example, different weights can be determined according to different charge state ranges, for example, the weight is 0.05 when the charge state is 0-10% of data; data with the charge state of 10-30% and the weight of 0.5; the weight of the data with the state of charge of 30-50 percent is 0.25; the weight of the data with the state of charge of 50-80 percent is 0.15; the weight of the data with the state of charge of 80-100 percent is 0.05; at this time, when the state of charge differences corresponding to the multiple sets of sample data are 5%, 30%, 33%, 42%, 44%, 56%, 60%, and 70%, respectively, the state of charge reference value is about 70%.
It will be understood that multiple sets of sample data are collected for each set unit of time, which may be one day, three days, one week, etc. Because the sample data is acquired only after the battery system of the vehicle enters the quasi-static working condition, if the battery system of the vehicle does not enter the quasi-static working condition all the time in unit time or the acquired sample data is less than a set data threshold value, the data in the unit time can be considered to have no reference value.
Optionally, the alarm information in step S105 includes:
n state of charge differences, recording time of the state of charge differences, and information of the cell monomer with the lowest open-circuit voltage.
Wherein n is a positive integer, and the information of the cell may include the number of the cell, for example, in an alarm message, the information may include a state of charge difference value 20% in the battery system, and a recording time 15 for generating the state of charge difference value: and 20, the number of the battery cell with the lowest open-circuit voltage is 23. It should be mentioned that the alarm information may also include information of the cell unit with the highest open circuit voltage, and the like.
Through the technical scheme, the sample data of the vehicle battery system under the quasi-static working condition is collected, the SOC-OCV table is combined to confirm the state of charge of the battery system, alarm information including abnormal time and abnormal content can be output when the difference value of the state of charge is abnormal, the accuracy is high, and the safety of the vehicle battery system is improved to a certain extent.
Fig. 3 is a block diagram of a state of charge warning device according to an exemplary embodiment. As shown in fig. 3, the state of charge warning apparatus 300 includes:
the data acquisition module 301 is configured to acquire multiple sets of sample data acquired in a set unit time, where the sample data includes a highest voltage Vmax and a lowest voltage Vmin of a battery cell of a battery system of a vehicle acquired when the vehicle meets a set condition.
The state of charge obtaining module 302 is configured to obtain a first state of charge corresponding to the highest voltage Vmax and a second state of charge corresponding to the lowest voltage Vmin in each group of sample data.
The difference obtaining module 303 is configured to obtain state of charge differences of multiple groups of sample data, where the state of charge difference of each group of sample data is a difference between a first state of charge and a second state of charge.
The reference value determining module 304 is configured to determine a state of charge reference value in unit time according to the state of charge difference values of multiple sets of sample data.
The alarm module 305 is configured to output alarm information when the state of charge reference values in a plurality of consecutive unit times are greater than a set state of charge threshold.
In the technical scheme, multiple sets of sample data collected in a set unit time are obtained, the sample data includes a highest voltage Vmax and a lowest voltage Vmin of a battery core of a battery system of a vehicle collected under the condition that the vehicle meets a set condition, a first state of charge corresponding to the highest voltage Vmax and a second state of charge corresponding to the lowest voltage Vmin in each set of sample data are obtained, state of charge differences of the multiple sets of sample data are obtained, the state of charge difference of each set of sample data is a difference between the first state of charge and the second state of charge, a state of charge reference value in the unit time is determined according to the state of charge differences of the multiple sets of sample data, and alarm information is output under the condition that the state of charge reference values in continuous multiple unit times are larger than a set state of charge threshold. Through the technical scheme, the state of charge of the battery system of the vehicle is monitored, the safety of the battery can be identified through the state of charge of the battery system, alarm information is output under the condition that the state of charge is abnormal, whether potential safety hazards exist in the battery system can be identified based on the state of charge of the battery system, early warning is carried out, and the safety of the battery system is guaranteed to a certain extent.
Optionally, the state of charge acquisition module 302 may include:
and the open-circuit voltage acquisition submodule is used for acquiring a first open-circuit voltage corresponding to the highest voltage Vmax and a second open-circuit voltage corresponding to the lowest voltage Vmin in each group of sample data.
And the charge state acquisition submodule is used for acquiring a first charge state corresponding to the first open-circuit voltage and a second charge state corresponding to the second open-circuit voltage of each group of sample data.
Optionally, the setting condition includes: the battery system reaches a quasi-static working condition, the battery system keeps the quasi-static working condition for exceeding a set time, and the maximum voltage Vmax of the battery cell of the battery system at the last moment of the quasi-static working condition is smaller than a set voltage.
The set voltage may be set according to different types of battery systems, and for example, the method for setting the voltage of a battery system such as a ternary lithium battery or a lithium iron phosphate battery is also different.
Optionally, the quasi-static operating condition is that the absolute value of the current of the battery system is smaller than a set absolute value of the current.
Optionally, the open circuit voltage acquisition submodule is configured to:
for each group of sample data, calculating a first open-circuit voltage corresponding to the highest voltage Vmax and a second open-circuit voltage corresponding to the lowest voltage Vmin according to the corresponding relation between the state of charge and the open-circuit voltage; the corresponding relationship includes the states of charge corresponding to a plurality of open-circuit voltages.
Optionally, the state of charge acquisition sub-module is configured to:
and for each group of sample data, determining a first charge state corresponding to the first open-circuit voltage and determining a second charge state corresponding to the second open-circuit voltage according to the corresponding relation between the charge states and the open-circuit voltages.
Optionally, the reference value determining module 304 is configured to:
and acquiring characteristic numerical values of the state of charge difference values of a plurality of groups of sample data as state of charge reference values.
Optionally, the state of charge warning device 300 may further include:
and the updating module is used for acquiring multiple groups of sample data acquired in the next set unit time, and according to the multiple groups of sample data acquired in the next set unit time, re-executing the steps from acquiring the first charge state corresponding to the highest voltage Vmax and the second charge state corresponding to the lowest voltage Vmin in each group of sample data to determining the charge state reference value according to the charge state difference values of the multiple groups of sample data so as to update the charge state reference value.
Optionally, the alert information may include: n charge state differences, recording time of the charge state differences, and information of the cell monomer with the lowest open-circuit voltage.
Through the technical scheme, the sample data of the vehicle battery system under the quasi-static working condition is collected, the SOC-OCV table is combined to confirm the state of charge of the battery system, alarm information including abnormal time and abnormal content can be output when the difference value of the state of charge is abnormal, the accuracy is high, and the safety of the vehicle battery system is improved to a certain extent.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
Fig. 4 is a block diagram illustrating an electronic device 400 according to an example embodiment. As shown in fig. 4, the electronic device 400 may include: a processor 401 and a memory 402. The electronic device 400 may also include one or more of a multimedia component 403, an input/output (I/O) interface 404, and a communications component 405.
The processor 401 is configured to control the overall operation of the electronic device 400, so as to complete all or part of the steps in the state of charge warning method. The memory 402 is used to store various types of data to support operations at the electronic device 400, such as instructions for any application or method operating on the electronic device 400 and application-related data, such as contact data, messaging, pictures, audio, video, and the like. The Memory 402 may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as Static Random Access Memory (SRAM), electrically Erasable Programmable Read-Only Memory (EEPROM), erasable Programmable Read-Only Memory (EPROM), programmable Read-Only Memory (PROM), read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk or optical disk. The multimedia components 403 may include a screen and an audio component. Wherein the screen may be, for example, a touch screen and the audio component is used for outputting and/or inputting audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signal may further be stored in the memory 402 or transmitted through the communication component 405. The audio assembly also includes at least one speaker for outputting audio signals. The I/O interface 404 provides an interface between the processor 401 and other interface modules, such as a keyboard, mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 405 is used for wired or wireless communication between the electronic device 400 and other devices. Wireless Communication, such as Wi-Fi, bluetooth, near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, or combinations thereof, which is not limited herein. The corresponding communication component 405 may therefore include: wi-Fi module, bluetooth module, NFC module, etc.
In an exemplary embodiment, the electronic Device 400 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above-mentioned state of charge warning method.
In another exemplary embodiment, a computer readable storage medium including program instructions for implementing the steps of the state of charge warning method described above when executed by a processor is also provided. For example, the computer readable storage medium may be the memory 402 comprising program instructions executable by the processor 401 of the electronic device 400 to perform the state of charge warning method described above.
In another exemplary embodiment, a computer program product is also provided, which comprises a computer program executable by a programmable apparatus, the computer program having code portions for performing the above-mentioned state of charge warning method when executed by the programmable apparatus.
Embodiments of the present disclosure also provide a vehicle that includes the apparatus shown in fig. 3, or may include the electronic device shown in fig. 4.
The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details in the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure. It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A state of charge warning method is applied to a vehicle, and comprises the following steps:
acquiring multiple groups of sample data acquired in set unit time, wherein the sample data comprises the highest voltage and the lowest voltage of a battery cell of a battery system of the vehicle acquired under the condition that the vehicle meets set conditions;
acquiring a first charge state corresponding to the highest voltage and a second charge state corresponding to the lowest voltage in each group of sample data;
acquiring the state of charge difference values of the multiple groups of sample data, wherein the state of charge difference value of each group of sample data is the difference value between the first state of charge and the second state of charge;
determining a state of charge reference value in the unit time according to the state of charge difference values of the multiple groups of sample data;
and under the condition that the continuous plurality of the state of charge reference values in the unit time are larger than the set state of charge threshold value, alarm information is output.
2. The method of claim 1, wherein said obtaining a first state of charge corresponding to said highest voltage and a second state of charge corresponding to said lowest voltage in each set of sample data comprises:
acquiring a first open-circuit voltage corresponding to the highest voltage and a second open-circuit voltage corresponding to the lowest voltage in each group of sample data;
and acquiring a first charge state corresponding to the first open-circuit voltage and a second charge state corresponding to the second open-circuit voltage of each group of sample data.
3. The method according to claim 1, wherein the setting conditions include:
the battery system reaches a quasi-static working condition, the battery system keeps the quasi-static working condition for exceeding a set time, and the highest voltage of the battery cell of the battery system at the last moment of the quasi-static working condition is smaller than a set voltage.
4. The method of claim 3, wherein the quasi-static condition is that an absolute value of current of the battery system is less than a set absolute value of current.
5. The method according to claim 2, wherein said obtaining a first open-circuit voltage corresponding to the highest voltage and a second open-circuit voltage corresponding to the lowest voltage in each set of sample data comprises:
for each group of sample data, calculating a first open-circuit voltage corresponding to the highest voltage and a second open-circuit voltage corresponding to the lowest voltage according to the corresponding relation between the state of charge and the open-circuit voltage; the corresponding relation comprises the charge states corresponding to the open-circuit voltages.
6. The method of claim 2, wherein said obtaining a first state of charge corresponding to said first open circuit voltage and a second state of charge corresponding to said second open circuit voltage for each set of sample data comprises:
and for each group of sample data, determining a first charge state corresponding to the first open-circuit voltage and determining a second charge state corresponding to the second open-circuit voltage according to the corresponding relation between the charge states and the open-circuit voltages.
7. The method of claim 1, wherein said determining a state of charge reference value per said unit time from the state of charge difference values of said plurality of sets of sample data comprises:
and acquiring characteristic numerical values of the state of charge difference values of the multiple groups of sample data as the state of charge reference values.
8. The method of claim 1, further comprising:
acquiring multiple groups of sample data acquired in the next set unit time, and according to the multiple groups of sample data acquired in the next set unit time, re-executing the steps from acquiring the first state of charge corresponding to the highest voltage and the second state of charge corresponding to the lowest voltage in each group of sample data to determining the state of charge reference value according to the state of charge difference values of the multiple groups of sample data so as to update the state of charge reference value.
9. A state of charge warning device for use in a vehicle, the device comprising:
the data acquisition module is used for acquiring multiple groups of sample data acquired in set unit time, wherein the sample data comprises the highest voltage and the lowest voltage of an electric core of a battery system of the vehicle acquired under the condition that the vehicle meets set conditions;
the charge state acquisition module is used for acquiring a first charge state corresponding to the highest voltage and a second charge state corresponding to the lowest voltage in each group of sample data;
the difference value acquisition module is used for acquiring the state of charge difference values of the multiple groups of sample data, wherein the state of charge difference value of each group of sample data is the difference value between the first state of charge and the second state of charge;
the reference value determining module is used for determining a charge state reference value in the unit time according to the charge state difference values of the multiple groups of sample data;
and the alarm module is used for outputting alarm information under the condition that the continuous charge state reference values in a plurality of unit time are greater than the set charge state threshold value.
10. A vehicle, characterized by comprising: the apparatus of claim 9.
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