CN117665598A - Battery abnormality detection method, device and medium - Google Patents
Battery abnormality detection method, device and medium Download PDFInfo
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- CN117665598A CN117665598A CN202211050032.3A CN202211050032A CN117665598A CN 117665598 A CN117665598 A CN 117665598A CN 202211050032 A CN202211050032 A CN 202211050032A CN 117665598 A CN117665598 A CN 117665598A
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- 230000005856 abnormality Effects 0.000 title claims abstract description 47
- 238000001514 detection method Methods 0.000 title claims abstract description 38
- 230000002159 abnormal effect Effects 0.000 claims abstract description 57
- 238000007599 discharging Methods 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 37
- 230000004044 response Effects 0.000 claims abstract description 20
- 230000008859 change Effects 0.000 claims description 71
- 238000004590 computer program Methods 0.000 claims description 8
- 230000006870 function Effects 0.000 claims description 4
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 4
- 238000005070 sampling Methods 0.000 description 21
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 229910052759 nickel Inorganic materials 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004070 electrodeposition Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 101001068634 Homo sapiens Protein PRRC2A Proteins 0.000 description 1
- 101000908580 Homo sapiens Spliceosome RNA helicase DDX39B Proteins 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 102100033954 Protein PRRC2A Human genes 0.000 description 1
- 102100024690 Spliceosome RNA helicase DDX39B Human genes 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present disclosure relates to a method, apparatus, and medium for detecting battery abnormality, the method being applied to a vehicle, including: in response to detecting a preset trigger event, discharging a first battery pack and charging a second battery pack, wherein the first battery pack and the second battery pack are selected from an upper battery pack and a lower battery pack in a battery pack of a vehicle; acquiring first battery data of the first battery pack and second battery data of the second battery pack; and determining abnormal single batteries in the first battery pack and/or the second battery pack according to the difference between the first battery data and the second battery data and the standard battery data. The method for detecting the battery abnormality can fully detect the battery abnormality and improve the reliability of a battery abnormality detection result.
Description
Technical Field
The disclosure relates to the technical field of batteries, and in particular relates to a method, a device and a medium for detecting battery abnormality.
Background
With the development of electric automobile technology at a high speed, electric automobiles are becoming popular in recent years, and a series of measures are usually adopted on batteries in order to raise the electric quantity of the batteries on the whole automobile as much as possible and shorten the electricity supplementing time. Due to the adoption of the measures, the battery is easy to cause abnormality under the condition of insufficient verification, and potential safety hazard of the vehicle is caused. Therefore, how to sufficiently detect battery abnormality is a technical problem to be solved.
Disclosure of Invention
In order to overcome the problems in the related art, the present disclosure provides a method, apparatus, and medium for detecting battery abnormality.
According to a first aspect of an embodiment of the present disclosure, there is provided a method for detecting battery abnormality, applied to a vehicle, including:
in response to detecting a preset trigger event, discharging a first battery pack and charging a second battery pack, wherein the first battery pack and the second battery pack are selected from an upper battery pack and a lower battery pack in a battery pack of a vehicle;
acquiring first battery data of the first battery pack and second battery data of the second battery pack;
and determining abnormal single batteries in the first battery pack and/or the second battery pack according to the difference between the first battery data and the second battery data and the standard battery data.
In some embodiments, the first battery data is first actual variation information of the discharge voltage of each battery cell in the first battery pack with the SOC of the first battery pack, and the second battery data is second actual variation information of the charge voltage of each battery cell in the second battery pack with the SOC of the second battery pack.
In some embodiments, the standard battery data includes first target variation information of a discharge voltage of the normal unit battery varying with an SOC of the unit battery, and second target variation information of a charge voltage of the normal unit battery varying with the SOC of the unit battery;
and determining abnormal single batteries in the first battery pack and/or the second battery pack according to the difference between the first battery data and the second battery data and the standard battery data, wherein the abnormal single batteries comprise:
and determining abnormal single batteries in the first battery pack according to the difference between the first actual change information and the first target change information, and/or determining abnormal single batteries in the second battery pack according to the difference between the second actual change information and the second target change information.
In some embodiments, the determining an abnormal cell in the first battery pack according to the difference between the first actual change information and the first target change information, and/or determining an abnormal cell in the second battery pack according to the difference between the second actual change information and the second target change information includes:
and determining the single battery corresponding to the first actual change information as an abnormal single battery under the condition that the voltage difference between the first actual change information and the first target change information is larger than a first preset threshold value, and/or determining the single battery corresponding to the second actual change information as an abnormal single battery under the condition that the voltage difference between the second actual change information and the second target change information is larger than a second preset threshold value.
In some embodiments, the method further comprises:
and stopping discharging of the first battery pack and charging of the second battery pack in response to detecting that the lowest discharge voltage of any single battery in the first battery pack is less than or equal to the single battery discharge cut-off voltage, and the highest charge voltage of any single battery in the second battery is greater than or equal to the single battery charge cut-off voltage, or that the SOC of the first battery pack is equal to the SOC of the second battery pack.
In some embodiments, the discharging the first battery pack and charging the second battery pack in response to detecting the preset trigger event comprises:
and under the condition that the first battery pack and the second battery pack are not in a full-charge state or a discharging state and the SOC of the first battery pack and the SOC of the second battery pack are larger than preset values, discharging the first battery pack and charging the second battery pack in response to detecting the preset trigger event.
In some embodiments, the preset trigger condition includes at least one of: the method comprises the steps of carrying out preset touch operation on terminal equipment of a vehicle by a user, enabling the vehicle to be in a standing state and enabling the vehicle to be in a locking anti-theft state.
In some embodiments, the upper part battery pack and the lower part battery pack are obtained by dividing the battery packs after connecting a wire harness led out from a cell position of a target number of cell of the battery packs of the vehicle with a three-phase line N point of a motor of the vehicle.
In some embodiments, the upper and lower battery packs include cells having the same number of cells or different numbers of cells.
In some embodiments, the battery pack employs a lithium iron phosphate battery or a ternary battery in any system.
According to a second aspect of the embodiments of the present disclosure, there is provided a detection apparatus for detecting battery abnormality, applied to a vehicle, including:
the charging and discharging module is configured to respond to detection of a preset trigger event, discharge the first battery pack and charge the second battery pack, wherein the first battery pack and the second battery pack are selected from an upper battery pack and a lower battery pack in a battery pack of the vehicle;
an acquisition module configured to acquire first battery data of the first battery pack and second battery data of the second battery pack;
and a determining module configured to determine an abnormal single battery in the first battery pack and/or the second battery pack according to differences between the first battery data and the second battery data and standard battery data.
According to a third aspect of the embodiments of the present disclosure, there is provided a detection apparatus for detecting a battery abnormality, including:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
in response to detecting a preset trigger event, discharging a first battery pack and charging a second battery pack, wherein the first battery pack and the second battery pack are selected from an upper battery pack and a lower battery pack in a battery pack of a vehicle;
acquiring first battery data of the first battery pack and second battery data of the second battery pack;
and determining abnormal single batteries in the first battery pack and/or the second battery pack according to the difference between the first battery data and the second battery data and the standard battery data.
According to a fourth aspect of embodiments of the present disclosure, there is provided a computer-readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the method for detecting a battery abnormality of any one of the first aspects.
Through the technical scheme, the first battery pack is discharged and the second battery pack is charged in response to the detection of the preset trigger event, so that the first battery pack is subjected to a discharging working condition and the second battery pack is subjected to a charging working condition, abnormal single batteries in the first battery pack and/or the second battery are identified under the working condition, the abnormal working condition of the battery is identified and can be reproduced through the preset trigger event, the abnormal detection opportunity of the battery is greatly increased, the abnormal battery can be fully detected, and the potential safety hazard of a vehicle is reduced.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
fig. 1 is a flowchart illustrating a method of detecting battery abnormality according to an exemplary embodiment.
Fig. 2 is a circuit configuration diagram of a charge and discharge control circuit according to an exemplary embodiment.
Fig. 3 is a block diagram illustrating a detection apparatus of battery abnormality according to an exemplary embodiment.
Fig. 4 is a block diagram illustrating a detection apparatus of battery abnormality according to an exemplary embodiment.
Description of the reference numerals
1-a battery pack; 2-a motor controller; 3-an electric motor; BTA 1-upper battery; BAT 2-lower cell stack; a1-a first current sampling sensor; a2-a second current sampling sensor; a3-a third current sampling sensor; T1-T6-bridge arm; k1-high voltage contactor.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
As described in the background art, with the development of electric automobile technology, electric automobiles have been popular in recent years, and in order to increase the battery power of the whole automobile and shorten the power-supplementing time period as much as possible, a series of measures are usually taken on the battery. For example, in order to raise the battery power on the whole vehicle as much as possible, the following manner is generally adopted: 1. improving the energy density of the battery, and adopting a high-nickel scheme, so that the electrochemical stability of the battery is poor; 2. arranging as many cells as possible in a limited space simplifies the structure of the cells, resulting in weakening the protection of the cell structure. In order to shorten the electricity supplementing time, the charging current of the battery is increased as much as possible, and the battery is easy to separate lithium. Due to the adoption of the measures, the battery is easy to cause abnormality under the condition of insufficient verification, and potential safety hazard of the vehicle is caused.
In the related art, whether the battery is abnormal or not is identified through strategies such as judging the pressure difference of the battery, the temperature of the battery, the voltage change in the charging and discharging processes and the like under specific working conditions, and because the judging methods need to be executed under the specific working conditions and the specific working conditions are difficult to appear, the probability of identifying the battery abnormality is less, the battery abnormality cannot be sufficiently detected, and the abnormal identification result is unreliable because the specific working conditions are uncontrollable.
Fig. 1 is a flowchart illustrating a method of detecting battery abnormality according to an exemplary embodiment. The detection method is applied to a vehicle, and as shown in fig. 1, the method includes the following steps.
In step 110, in response to detecting the preset trigger event, the first battery pack is discharged and the second battery pack is charged, the first battery pack and the second battery pack being selected from an upper battery pack and a lower battery pack in a battery pack of the vehicle.
In some embodiments, the vehicle may be an electric vehicle, and the battery pack is the primary energy carrier of the vehicle to provide electrical energy to the entire vehicle. The first battery pack and the second battery pack are selected from an upper battery pack and a lower battery pack in a battery pack of the vehicle. In some embodiments, the upper and lower battery packs include cells having the same number of poles or different numbers of poles. For example, the upper battery pack may include a first preset number of battery cells connected in series, and the lower battery pack may include a second preset number of battery cells connected in series. The first preset number of nodes and the second preset number of nodes may be the same or different.
In some embodiments, the battery type of the battery pack may be specifically selected according to actual requirements. In some embodiments, the battery pack may employ a lithium iron phosphate battery or a ternary battery in any system. The system of the ternary battery can be divided according to different mixing ratios of nickel, cobalt and manganese in the positive electrode material of the ternary battery, for example, nickel: cobalt: the ratio of manganese is 8:1:1, and the ternary battery is 811 system; nickel: cobalt: the ratio of manganese is 5:2:3, then the ternary battery is a 523 system. It is to be understood that the ternary battery system herein is by way of illustrative example only and the ternary battery system of the present disclosure is not so limited.
In some embodiments, the preset trigger condition may include at least one of: the method comprises the steps of presetting touch operation of a user on terminal equipment of a vehicle, enabling the vehicle to be in a standing state and enabling the vehicle to be in a locking anti-theft state. In some embodiments, the terminal device of the vehicle may include a diagnostic device or a multimedia screen. The preset touch operation can be specifically determined according to actual requirements, for example, the preset touch operation can be to click a target control or press a target vehicle button, and the like.
Through the preset touch operation of a user on the terminal equipment of the vehicle, the abnormal single battery is triggered and detected, so that the abnormal battery detection can be performed through manual control, and the triggering mode is flexible and controllable. The battery abnormality detection can be automatically performed by triggering the abnormal detection single battery when the vehicle is in a standing state or in a locking anti-theft state, so that the possibility of detecting the battery abnormality is further increased, and the reliability of detecting the battery abnormality is improved.
In some embodiments, discharging the first battery pack and charging the second battery pack in response to detecting the preset trigger event may include: and under the condition that the first battery pack and the second battery pack are not in a full-charge state or a discharging state and the SOC of the first battery pack and the SOC of the second battery pack are larger than a preset value, discharging the first battery pack and charging the second battery pack in response to detecting a preset trigger event. The first battery pack and the second battery pack are provided with charge and discharge conditions to trigger abnormal battery detection by responding to detection of a preset trigger event under the conditions, so that the safety of abnormal battery detection can be ensured.
In some embodiments, the upper and lower battery packs may be divided into battery packs of the vehicle. In some embodiments, the upper part battery pack and the lower part battery pack may be obtained by dividing the battery pack after connecting a wire harness led out from a cell position of a target number of cell of the battery pack of the vehicle with a three-phase line N point of a motor of the vehicle, wherein the upper part battery pack may be a battery pack having a high potential and connected to a positive lead-out portion of the battery pack, and the lower part battery pack may be a battery pack having a low potential and connected to a negative lead-out portion of the battery pack.
By way of example, taking a battery pack of a vehicle including 10 series-connected single cells, the target number of single cells being the 5 th single cell, the battery pack may be divided into battery packs each including 5 single cells by connecting a wire harness led out at the position of the 5 th single cell with the N point of the three phase line of the motor of the vehicle, and a battery pack including 5 single cells having a high potential and connected to the positive electrode lead-out portion of the battery pack is determined as an upper portion battery pack, and a battery pack including 5 single cells having a low potential and connected to the negative electrode lead-out portion of the battery pack is determined as a lower portion battery pack.
According to the embodiment of the disclosure, the wire harness led out from the position of the single battery with the target number of the battery pack of the vehicle is connected with the three-phase line N point of the motor of the vehicle, so that the battery pack is divided into the upper battery pack and the lower battery pack, and as the motor is a component existing in the vehicle, the battery pack can be divided into the upper battery pack and the lower battery pack only by adding one wire harness, and then the upper battery pack and the lower battery pack are mutually charged and discharged, so that the condition for discharging the first battery pack and charging the second battery pack is created for abnormal detection of the battery, the opportunity for abnormal detection of the battery can be increased, and the reliability of abnormal detection of the battery is further improved.
As described above, the first battery pack and the second battery pack are selected from the upper battery pack and the lower battery pack, and for example, the upper battery pack may be determined as the first battery pack and the lower battery pack may be determined as the second battery pack, or the upper battery pack may be determined as the second battery pack and the lower battery pack may be determined as the first battery pack.
Correspondingly, in the case where the upper-portion battery pack is determined as the first battery pack and the lower-portion battery pack is determined as the second battery pack, discharging the first battery pack and charging the second battery pack may refer to discharging the upper-portion battery pack and charging the lower-portion battery pack, which may be achieved by charging the lower-portion battery pack through the upper-portion battery pack. In determining the upper battery pack as the second battery pack and the lower battery pack as the first battery pack, discharging the first battery pack and charging the second battery pack may refer to discharging the lower battery pack and charging the upper battery pack, which may be accomplished by charging the upper battery pack with the lower battery pack.
In some embodiments, discharging the first battery pack and charging the second battery pack may include: and discharging the first battery pack and charging the second battery pack according to the preset charge-discharge current. The preset charge-discharge current may include, but is not limited to, a constant current direct current, a sine wave alternating current, a square wave alternating current, a trapezoidal wave alternating current, a combination of alternating currents, an irregular waveform current, a sine wave bias control current, a square wave bias control current, or a trapezoidal wave bias control current.
In some embodiments, discharging the first battery pack and charging the second battery pack may include: the first battery pack is discharged and the second battery pack is charged by the charge-discharge control circuit. In still other embodiments, discharging the first battery pack and charging the second battery pack may include: and discharging the first battery pack and charging the second battery pack according to a preset charging and discharging current through a charging and discharging control circuit. For the preset charge-discharge current, reference may be made to the foregoing related description, and no further description is provided herein.
As shown in fig. 2, the charge and discharge control circuit may include a battery pack 1, a motor controller 2, and a motor 3, wherein the positive electrode of the battery pack 1 is connected with the positive electrode of the motor controller 2, the negative electrode of the battery pack 1 is connected with the negative electrode of the motor controller 2, the three-phase wiring terminal of the motor controller 2 is connected with the three-phase wiring terminal of the motor 3, and the N point of the three-phase wiring terminal of the motor 3 is connected with the negative electrode of the upper battery pack BAT1 and the positive electrode of the lower battery pack BAT2 through a wire harness. In some embodiments, a high voltage contactor K1 may also be provided on the wire harness.
The motor controller and the motor in the charge-discharge control circuit of the embodiment of the disclosure form the motor electric control topology existing in the vehicle, and the charge-discharge control circuit simplifies the structure of the charge-discharge control circuit by multiplexing the motor electric control topology, so that the cost of detecting battery abnormality is reduced.
In some embodiments, the motor controller 2 includes a plurality of bridge arms, as shown in fig. 2, and the motor controller may include bridge arms T1, T2, T3, T4, T5, and T6, and the charge-discharge control circuit may control the first battery pack to charge the second battery pack by controlling the on or off of the bridge arms in the motor controller 2 to discharge the first battery pack and charge the second battery pack. For example, when the first battery pack is the upper battery pack and the second battery pack is the lower battery pack, the first battery pack can be controlled to charge the second battery pack by controlling the bridge arm T1 to be on and the bridge arms T2-T6 to be off so as to discharge the first battery pack and charge the second battery pack.
In some embodiments, the high-voltage loops of the upper part battery pack and the lower part battery pack in the charge-discharge control circuit respectively comprise at least one current sampling sensor, and the current sampling sensors are used for high-voltage loop current collection by the battery management controller. In some embodiments, the current sampling sensor may include, but is not limited to, a current hall sensor or a shunt.
In some embodiments, the current sampling sensor may be disposed at a position between the cell of the upper battery pack and the cell of the lower battery pack, or may be disposed at a positive electrode position or a negative electrode position of the upper battery pack.
In some embodiments, the charge-discharge control circuit may further include a first current sampling sensor A1, a second current sampling sensor A2, and/or a third current sampling sensor A3, where the first current sampling sensor A1, the second current sampling sensor A2, and the third current sampling sensor A3 are respectively configured to collect currents in the high-voltage circuits where the respective high-voltage circuits are located, and send the currents to the battery management controller.
For example, if there are 1 current sampling sensors on the high-voltage circuits of the upper part battery pack and the lower part battery pack respectively, namely A1 and A2, the motor N-line circuit may not include the current sampling sensors; if there are 1 current sampling sensor A1 on the high-voltage loop of the upper part of the battery pack and there are no current sampling sensors on the high-voltage loop of the lower part of the battery pack, the motor N-line loop contains 1 current sampling sensor A3, if there are no current sampling sensors on the high-voltage loop of the upper part of the battery pack and there are 1 current sampling sensor A2 on the high-voltage loop of the lower part of the battery pack, the motor N-line loop contains 1 current sampling sensor A3, and the same current direction is set according to kirchhoff's law, the current relationship is a3=a1+a2.
According to the embodiment of the disclosure, the first battery pack is discharged and the second battery pack is charged in response to the detection of the preset trigger event, so that the first battery pack is subjected to a discharging working condition and the second battery pack is subjected to a charging working condition, abnormal single batteries in the first battery pack and/or the second battery are identified under the working condition, the working condition of identifying battery abnormality can be reproduced through the preset trigger event, the battery abnormality detection opportunity is greatly increased, the battery abnormality can be fully detected, and the potential safety hazard of a vehicle is reduced.
Step 120, obtaining first battery data of the first battery pack and second battery data of the second battery pack.
In some embodiments, the first battery data is first actual variation information of the discharge voltage of each battery cell in the first battery pack with the SOC of the first battery pack, and the second battery data is second actual variation information of the charge voltage of each battery cell in the second battery pack with the SOC of the second battery pack.
In some embodiments, after discharging the first battery pack and charging the second battery pack, the method further comprises: acquiring change information of discharge voltage of each single battery in the first battery pack and change information of SOC of the first battery pack in a discharge process of the first battery pack, and acquiring change information of charge voltage of each single battery in the second battery pack and change information of SOC of the second battery pack in a charge process of the second battery pack; the acquiring the first battery data of the first battery pack and the second battery data of the second battery pack includes: the first actual change information is determined according to the change information of the discharge voltage of each single battery in the first battery pack and the change information of the SOC of the first battery pack, and the second actual change information is determined according to the change information of the charge voltage of each single battery in the second battery pack and the change information of the SOC of the second battery pack.
And 130, determining abnormal single batteries in the first battery pack and/or the second battery pack according to the difference between the first battery data and the second battery data and the standard battery data.
In some embodiments, the standard battery data includes first target variation information of a discharge voltage of the normal battery cell as a function of an SOC of the battery cell, and second target variation information of a charge voltage of the normal battery cell as a function of the SOC of the battery cell; determining an abnormal single battery in the first battery pack and/or the second battery pack according to the difference between the first battery data and the second battery data and the standard battery data, wherein the abnormal single battery comprises the following components: and determining abnormal single batteries in the first battery pack according to the difference between the first actual change information and the first target change information, and/or determining abnormal single batteries in the second battery pack according to the difference between the second actual change information and the second target change information.
In some embodiments, determining an abnormal cell in the first battery pack according to a difference between the first actual change information and the first target change information, and/or determining an abnormal cell in the second battery pack according to a difference between the second actual change information and the second target change information, includes: and determining the single battery corresponding to the first actual change information as an abnormal single battery under the condition that the voltage difference between the first actual change information and the first target change information is larger than a first preset threshold value, and/or determining the single battery corresponding to the second actual change information as an abnormal single battery under the condition that the voltage difference between the second actual change information and the second target change information is larger than a second preset threshold value.
In some embodiments, the first preset threshold or the second preset threshold may be an allowable deviation voltage range of the normal unit battery, for example, the first preset threshold may be ±u1, the second preset threshold may be ±u2, where the values of U1 and U2 are specifically determined according to the actual situation, and the values may be fixed values or data sets that change with SOC. In some embodiments, the first preset threshold or the second preset threshold is related to a charging mode, for example, when the first battery pack is discharged and the second battery pack is charged according to the constant current direct current in the preset charging and discharging currents, the first preset threshold or the second preset threshold may be an allowable deviation voltage range calibrated by the normal single battery under the direct current discharging current condition.
And determining abnormal single batteries in the first battery pack according to the difference between the first actual change information and the first target change information, and/or determining abnormal single batteries in the second battery pack according to the difference between the second actual change information and the second target change information, so that the change information of voltage along with the SOC is considered in the process of detecting the abnormal batteries, and the accuracy and the reliability of battery abnormality detection can be improved by considering the SOC information and the voltage information.
In some embodiments, the method further comprises: and in response to detecting that the lowest discharge voltage of any single battery in the first battery pack is less than or equal to the single battery discharge cut-off voltage, the highest charge voltage of any single battery in the second battery is more than or equal to the single battery charge cut-off voltage, or the SOC of the first battery pack is equal to the SOC of the second battery pack, stopping the discharge of the first battery pack and the charge of the second battery pack. The foregoing determination condition may be used to indicate that the first battery pack or the second battery pack cannot be charged or discharged any more, or the safety of the battery itself may be affected, so that stopping the discharging of the first battery pack and the charging of the second battery pack at this time may avoid causing the battery to be in a dangerous condition, thereby improving the safety of the vehicle.
Fig. 3 is a block diagram showing a battery abnormality detection apparatus 300 according to an exemplary embodiment, which is applied to a vehicle. As shown in fig. 3, the apparatus 300 includes:
a charge-discharge module 310 configured to discharge a first battery pack and charge a second battery pack in response to detection of a preset trigger event, the first and second battery packs being selected from an upper and a lower battery pack in a battery pack of a vehicle;
an acquisition module 320 configured to acquire first battery data of the first battery pack and second battery data of the second battery pack;
a determining module 330 configured to determine abnormal unit cells in the first battery pack and/or the second battery pack according to differences between the first battery data and the second battery data and standard battery data, respectively.
In some embodiments, the first battery data is first actual variation information of the discharge voltage of each battery cell in the first battery pack with the SOC of the first battery pack, and the second battery data is second actual variation information of the charge voltage of each battery cell in the second battery pack with the SOC of the second battery pack.
In some embodiments, the standard battery data includes first target variation information of a discharge voltage of the normal unit battery varying with an SOC of the unit battery, and second target variation information of a charge voltage of the normal unit battery varying with the SOC of the unit battery; the determination module 330 is further configured to:
and determining abnormal single batteries in the first battery pack and/or the second battery pack according to the difference between the first battery data and the second battery data and the standard battery data, wherein the abnormal single batteries comprise:
and determining abnormal single batteries in the first battery pack according to the difference between the first actual change information and the first target change information, and/or determining abnormal single batteries in the second battery pack according to the difference between the second actual change information and the second target change information.
In some embodiments, the determination module 330 is further configured to:
and determining the single battery corresponding to the first actual change information as an abnormal single battery under the condition that the voltage difference between the first actual change information and the first target change information is larger than a first preset threshold value, and/or determining the single battery corresponding to the second actual change information as an abnormal single battery under the condition that the voltage difference between the second actual change information and the second target change information is larger than a second preset threshold value.
In some embodiments, the apparatus further comprises:
and a stopping module configured to stop discharging of the first battery pack and charging of the second battery pack in response to detecting that a lowest discharge voltage of any one of the first battery packs is equal to or less than a battery cell discharge cutoff voltage, a highest charge voltage of any one of the second battery packs is equal to or greater than a battery cell charge cutoff voltage, or an SOC of the first battery pack is equal to an SOC of the second battery pack.
In some embodiments, the charge-discharge module 310 is further configured to:
and under the condition that the first battery pack and the second battery pack are not in a full-charge state or a discharging state and the SOC of the first battery pack and the SOC of the second battery pack are larger than preset values, discharging the first battery pack and charging the second battery pack in response to detecting the preset trigger event.
In some embodiments, the preset trigger condition includes at least one of: the method comprises the steps of carrying out preset touch operation on terminal equipment of a vehicle by a user, enabling the vehicle to be in a standing state and enabling the vehicle to be in a locking anti-theft state.
In some embodiments, the upper part battery pack and the lower part battery pack are obtained by dividing the battery packs after connecting a wire harness led out from a cell position of a target number of cell of the battery packs of the vehicle with a three-phase line N point of a motor of the vehicle.
In some embodiments, the upper and lower battery packs include cells having the same number of cells or different numbers of cells.
In some embodiments, the battery pack employs a lithium iron phosphate battery or a ternary battery in any system.
Fig. 4 is a block diagram illustrating a battery abnormality detection apparatus 400 according to an exemplary embodiment. For example, the battery abnormality detection apparatus 400 may be provided as a server. Referring to fig. 4, the battery abnormality detection apparatus 400 includes a processor 422, which may be one or more in number, and a memory 432 for storing a computer program executable by the processor 422. The computer program stored in memory 432 may include one or more modules each corresponding to a set of instructions. Further, the processor 422 may be configured to execute the computer program to perform the above-described method of detecting battery abnormality.
In addition, the battery abnormality detection apparatus 400 may further include a power supply component 426 and a communication component 450, the power supply component 426 may be configured to perform power management of the battery abnormality detection apparatus 400, and the communication component 450 may be configured to enable communication, e.g., wired or wireless communication, of the battery abnormality detection apparatus 400. In addition, the battery abnormality detection apparatus 400 may further include an input/output (I/O) interface 458. The battery abnormality detection apparatus 400 may operate based on an operating system stored in the memory 432, such as Windows server (tm), mac OS XTM, unixTM, linuxTM, or the like.
In another exemplary embodiment, there is also provided a computer readable storage medium including program instructions which, when executed by a processor, implement the steps of the above-described method of detecting a battery abnormality. For example, the computer readable storage medium may be the memory 432 including the program instructions described above, which are executable by the processor 422 of the battery abnormality detection apparatus 400 to perform the battery abnormality detection method described above.
In another exemplary embodiment, a computer program product is also provided, comprising a computer program executable by a programmable apparatus, the computer program having code portions for performing the above-described method of detecting a battery abnormality when executed by the programmable apparatus.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.
Claims (13)
1. A method for detecting battery abnormality, applied to a vehicle, comprising:
in response to detecting a preset trigger event, discharging a first battery pack and charging a second battery pack, wherein the first battery pack and the second battery pack are selected from an upper battery pack and a lower battery pack in a battery pack of a vehicle;
acquiring first battery data of the first battery pack and second battery data of the second battery pack;
and determining abnormal single batteries in the first battery pack and/or the second battery pack according to the difference between the first battery data and the second battery data and the standard battery data.
2. The method of claim 1, wherein the first battery data is first actual change information of a discharge voltage of each battery cell in the first battery pack as a function of an SOC of the first battery pack, and the second battery data is second actual change information of a charge voltage of each battery cell in the second battery pack as a function of an SOC of the second battery pack.
3. The method according to claim 2, wherein the standard battery data includes first target variation information of a discharge voltage of a normal battery cell with an SOC of the battery cell, and second target variation information of a charge voltage of the normal battery cell with the SOC of the battery cell;
and determining abnormal single batteries in the first battery pack and/or the second battery pack according to the difference between the first battery data and the second battery data and the standard battery data, wherein the abnormal single batteries comprise:
and determining abnormal single batteries in the first battery pack according to the difference between the first actual change information and the first target change information, and/or determining abnormal single batteries in the second battery pack according to the difference between the second actual change information and the second target change information.
4. A method according to claim 3, wherein determining an abnormal cell in the first battery pack based on a difference between the first actual change information and the first target change information, and/or determining an abnormal cell in the second battery pack based on a difference between the second actual change information and the second target change information, comprises:
and determining the single battery corresponding to the first actual change information as an abnormal single battery under the condition that the voltage difference between the first actual change information and the first target change information is larger than a first preset threshold value, and/or determining the single battery corresponding to the second actual change information as an abnormal single battery under the condition that the voltage difference between the second actual change information and the second target change information is larger than a second preset threshold value.
5. The method according to any one of claims 1-4, further comprising:
and stopping discharging of the first battery pack and charging of the second battery pack in response to detecting that the lowest discharge voltage of any single battery in the first battery pack is less than or equal to the single battery discharge cut-off voltage, and the highest charge voltage of any single battery in the second battery is greater than or equal to the single battery charge cut-off voltage, or that the SOC of the first battery pack is equal to the SOC of the second battery pack.
6. The method of claim 1, wherein discharging the first battery pack and charging the second battery pack in response to detecting the preset trigger event comprises:
and under the condition that the first battery pack and the second battery pack are not in a full-charge state or a discharging state and the SOC of the first battery pack and the SOC of the second battery pack are larger than preset values, discharging the first battery pack and charging the second battery pack in response to detecting the preset trigger event.
7. The method according to claim 1 or 6, wherein the preset trigger condition comprises at least one of: the method comprises the steps of carrying out preset touch operation on terminal equipment of a vehicle by a user, enabling the vehicle to be in a standing state and enabling the vehicle to be in a locking anti-theft state.
8. The method according to claim 1, wherein the upper part battery pack and the lower part battery pack are obtained by dividing the battery pack after connecting a wire harness led out at a cell position of a target number of cell of the battery pack of the vehicle with a three-phase line N point of a motor of the vehicle.
9. The method of claim 8, wherein the upper and lower battery packs comprise cells having the same or different numbers of cells.
10. The method of claim 1 or 8, wherein the battery pack is a lithium iron phosphate battery or a ternary battery in any system.
11. A battery abnormality detection device, characterized by being applied to a vehicle, comprising:
the charging and discharging module is configured to respond to detection of a preset trigger event, discharge the first battery pack and charge the second battery pack, wherein the first battery pack and the second battery pack are selected from an upper battery pack and a lower battery pack in a battery pack of the vehicle;
an acquisition module configured to acquire first battery data of the first battery pack and second battery data of the second battery pack;
and a determining module configured to determine an abnormal single battery in the first battery pack and/or the second battery pack according to differences between the first battery data and the second battery data and standard battery data.
12. A battery abnormality detection device, characterized by comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
in response to detecting a preset trigger event, discharging a first battery pack and charging a second battery pack, wherein the first battery pack and the second battery pack are selected from an upper battery pack and a lower battery pack in a battery pack of a vehicle;
acquiring first battery data of the first battery pack and second battery data of the second battery pack;
and determining abnormal single batteries in the first battery pack and/or the second battery pack according to the difference between the first battery data and the second battery data and the standard battery data.
13. A computer readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the steps of the method for detecting a battery abnormality as claimed in any one of claims 1 to 10.
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| CN202211050032.3A CN117665598A (en) | 2022-08-30 | 2022-08-30 | Battery abnormality detection method, device and medium |
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