CN113671393A - Current acquisition and detection method, battery pack and electric device - Google Patents
Current acquisition and detection method, battery pack and electric device Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 39
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- 239000000463 material Substances 0.000 description 3
- 230000003111 delayed effect Effects 0.000 description 2
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- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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- 239000003792 electrolyte Substances 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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/386—Arrangements for measuring battery or accumulator variables using test-loads
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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]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
Abstract
The embodiment of the application discloses a current collection detection method, a battery pack and an electric device, wherein the method comprises the steps of obtaining a first time voltage or a first SOC value and a first threshold voltage at a first time, obtaining a real-time current in a charging or discharging process by using the first threshold voltage or the first charging threshold voltage, and obtaining a second time voltage or a second SOC value and an electric quantity variation at a second time according to the real-time current. The amount of change in the amount of electricity includes an amount of change in the amount of electricity during charging or discharging. And judging whether the current collection is abnormal or not according to the voltage-electric quantity mapping relation, the first threshold voltage, the electric quantity variation, the first moment voltage and the second moment voltage, or judging whether the current collection is abnormal or not according to the voltage-electric quantity mapping relation, the first threshold voltage, the electric quantity variation, the first SOC value and the second SOC value. Through the mode, the accuracy of current acquisition and detection can be improved.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a current acquisition and detection method, a battery pack and an electric device.
Background
In a battery system, it is generally necessary to use a current collecting circuit to collect current flowing in a loop in the battery system. By detecting whether the current acquisition loop is abnormal or not and giving an alarm or cutting off the loop in time when the current acquisition loop is abnormal, the problems of lithium precipitation of the battery, large SOC error, over-temperature of a power wire harness or influence on the service life of the battery and the like caused by abnormal current can be avoided.
In the related art, a device with current failure detection, such as a chip of type LTC2949 (the chip has a current failure detection function), is usually adopted, and a circuit formed by the chip of the LTC2949, the main control MCU and the device can be used for detecting whether a current acquisition loop is abnormal, and the specific implementation is as follows: the current values under each time sequence are acquired by controlling the switching time sequence of the device, and then the current values under each time sequence are compared to detect whether the current acquisition loop is abnormal or not.
Disclosure of Invention
In the process of implementing the embodiment of the present application, the inventors of the present application find that: in the related art, the accuracy of detecting whether the current acquisition loop is abnormal is related to the reliability of hardware, and the conditions of aging or abnormal quality of the hardware and the like can cause misjudgment.
The embodiment of the application aims to provide a current acquisition and detection method, a battery pack and an electric device, and the accuracy of current acquisition and detection can be improved.
In order to achieve the above object, in a first aspect, the present application provides a current collection detection method, including obtaining a first time voltage or a first SOC value and a first threshold voltage at a first time, where the first threshold voltage includes a first discharging threshold voltage or a first charging threshold voltage. And acquiring real-time current in the charging or discharging process, and acquiring voltage or a second SOC value at a second moment and electric quantity variation according to the real-time current, wherein the electric quantity variation comprises the variation of the electric quantity in the charging or discharging process. And judging whether the current collection is abnormal or not according to the voltage-electric quantity mapping relation, the first threshold voltage, the electric quantity variation, the first moment voltage and the second moment voltage, or judging whether the current collection is abnormal or not according to the voltage-electric quantity mapping relation, the first threshold voltage, the electric quantity variation, the first SOC value and the second SOC value.
The current collection method comprises the steps of obtaining a voltage electric quantity mapping relation, a first time voltage or a first SOC value, a first threshold voltage and an electric quantity variable quantity, obtaining a voltage change characteristic according to the first threshold voltage, the second time voltage or the second SOC value, and detecting whether current collection is abnormal or not in real time according to the corresponding relation between the voltage change characteristic and the electric quantity change characteristic. By combining actual parameters in the charging or discharging process, the probability of misjudgment can be reduced, and compared with the method for detecting the current collection abnormality by adopting a chip in the related technology, the method has higher accuracy. Meanwhile, the current acquisition and detection are simple, and the practicability is improved, and meanwhile, the detection efficiency is improved.
In an optional manner, before determining whether the current collection is abnormal according to the voltage-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first time voltage, and the second time voltage, or determining whether the current collection is abnormal according to the voltage-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the current first SOC value, and the second SOC value, the method further includes: n groups of current parameters are obtained in a first time period, and a first current average value in the N groups of current parameters is calculated, wherein N is a positive integer. If the first current average value is larger than the first current threshold value, whether current collection is abnormal or not is judged according to the voltage-electric quantity mapping relation, the first threshold voltage, the electric quantity variation, the first time voltage and the second time voltage, or whether current collection is abnormal or not is judged according to the voltage-electric quantity mapping relation, the first threshold voltage, the electric quantity variation, the first SOC value and the second SOC value.
In an optional manner, before obtaining N sets of current parameters for a first time period and calculating a first current average value of the N sets of current parameters, the method further includes: the method comprises the steps of acquiring the voltage of each battery cell and the total voltage of a battery pack in real time, wherein the battery pack comprises at least one battery cell. If the absolute value of the difference between the sum of the voltages of the battery cells and the total voltage is smaller than a first difference value, or the ratio of the absolute value of the difference between the sum of the voltages of the battery cells and the total voltage to the total voltage is smaller than a first ratio, acquiring N sets of current parameters within a first time period, and calculating a first current average value in the N sets of current parameters.
If the absolute value of the difference between the sum of the voltages of the electric cores and the total voltage of the battery pack is smaller than the first difference, or the ratio of the absolute value to the total voltage of the battery pack is smaller than the first ratio, the voltage acquisition function is considered to be normal, and the accuracy of the acquired voltage parameters is improved. Then, after the voltage acquisition function is judged to be normal, whether current acquisition is abnormal is judged according to each voltage parameter with higher accuracy, so that misjudgment is reduced, and the accuracy of current acquisition is improved.
In an optional manner, determining whether the current collection is abnormal according to the voltage-electric quantity mapping relationship, the first threshold voltage, the electric quantity variation, the first time voltage, and the second time voltage, or determining whether the current collection is abnormal according to the first threshold voltage, the electric quantity variation, the first SOC value, and the second SOC value includes: in the charging process, a first target electric quantity variable quantity is obtained according to the first time voltage or the first SOC value, the voltage electric quantity mapping relation and the first charging threshold voltage. And if the electric quantity variation is larger than the first target electric quantity variation and the voltage at the second moment is smaller than the first charging threshold voltage, determining that the current collection is abnormal.
In an optional manner, determining whether the current collection is abnormal according to the voltage-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first time voltage, and the second time voltage, or determining whether the current collection is abnormal according to the voltage-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first SOC value, and the second SOC value includes: and in the discharging process, acquiring a second target electric quantity variable quantity according to the first time voltage or the first SOC value, the voltage electric quantity mapping relation and the first discharging threshold voltage. And if the electric quantity variation is larger than the second target electric quantity variation and the voltage at the second moment is larger than the first discharge threshold voltage, determining that the current collection is abnormal.
In an optional manner, determining whether the current collection is abnormal according to the voltage-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first time voltage, and the second time voltage, or determining whether the current collection is abnormal according to the voltage-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first SOC value, and the second SOC value includes: and if the voltage at the second moment is greater than the first charging threshold voltage and the electric quantity variation is a negative value, determining that the current collection is abnormal.
In an optional manner, determining whether the current collection is abnormal according to the voltage-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first time voltage, and the second time voltage, or determining whether the current collection is abnormal according to the voltage-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first SOC value, and the second SOC value includes: and if the voltage at the second moment is smaller than the first discharging threshold voltage and the electric quantity variation is a positive value, determining that the current collection is abnormal.
In an optional manner, the method further comprises: and if the first current average value is smaller than the first current threshold value, acquiring a second duration that the first current average value is smaller than the first current threshold value. And if the second duration is longer than the first duration threshold, judging whether the current collection is abnormal according to the voltage or the total voltage of the single battery cell.
In an optional manner, determining whether current collection is abnormal according to a voltage or a total voltage of a single battery cell includes: and if the change amplitude of the voltage of the single battery cell is greater than the first voltage change threshold value, or the change amplitude of the total voltage is greater than the second voltage change threshold value, delaying for a third time. And acquiring M groups of current parameters in a third time period, and calculating a second current average value in the M groups of current parameters, wherein M is a positive integer. And if the second current average value is smaller than the first current threshold value, determining that the current collection is abnormal.
In a second aspect, the present application provides a battery pack, including at least one battery cell, where the battery cell is used for charging or discharging. A battery management system connected to the battery cells, the battery management system being configured to perform the method of the first aspect.
In a third aspect, the present application provides a power consuming apparatus, comprising a load and a battery pack as in the second aspect, the battery pack being configured to supply power to the load.
One or more embodiments of the present application include the following advantageous effects: in the current sampling detection method provided by the application, first time voltage or a first SOC value and a first threshold voltage are obtained, then real-time current in a charging or discharging process is obtained to obtain a second time voltage or a second SOC value and an electric quantity variation, wherein in the charging or discharging process, both the electric quantity and the voltage can be changed, and the change characteristics of the electric quantity and the voltage have a corresponding relation, then the change characteristics of the electric quantity can be obtained according to the voltage-electric quantity mapping relation, the first time voltage or the first SOC value, the first threshold voltage and the electric quantity variation, and the change characteristics of the voltage can be obtained according to the voltage-electric quantity mapping relation, the first threshold voltage, the second time voltage or the second SOC value, and thus whether current collection is abnormal or not can be detected in real time according to the corresponding relation between the two change characteristics. The method is combined with various change parameters in the charging or discharging process, the probability of error judgment can be reduced, and compared with the method for detecting the current collection abnormality by adopting a chip, the method for detecting the current collection accuracy is higher. And secondly, related devices such as chips for current failure detection are reduced, and cost reduction is facilitated. Meanwhile, the current sampling detection method is simple, the practicability is improved, and the detection efficiency is also improved. In addition, before judging whether current collection is abnormal, the voltage collection function is detected, the accuracy of detection of each voltage parameter can be improved, and the current collection accuracy can be further improved.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a battery pack provided in an embodiment of the present application;
fig. 2 is a flowchart of a current collection and detection method provided in an embodiment of the present application;
FIG. 3 is a flowchart of one implementation of step 23 shown in FIG. 2, as provided in an embodiment of the present application;
FIG. 4 is a flowchart of another implementation of step 23 shown in FIG. 2, provided in an embodiment of the present application;
FIG. 5 is a flowchart of yet another implementation of step 23 shown in FIG. 2, as provided in an embodiment of the present application;
FIG. 6 is a flowchart of yet another implementation of step 23 shown in FIG. 2, as provided in an embodiment of the present application;
FIG. 7 is a flowchart of a method performed when the first current average is less than the first current threshold according to an embodiment of the present disclosure;
fig. 8 is a flowchart of a current collection and detection method according to another embodiment of the present application;
fig. 9 is a schematic structural diagram of a current collection and detection device provided in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present disclosure. The battery pack 1 includes a cell module 10 and a battery management system 11. The battery core module 10 and the battery management system 11 may be connected by a wire harness, and the wire harness includes a data acquisition wire harness and a power wire harness. The battery cell module 10 includes at least one battery cell, and the battery cell is used for charging or discharging, and can adopt the mode of circulated recharging to charge repeatedly. In an embodiment, the battery cell in the battery cell module 10 mainly includes a positive electrode plate, a negative electrode plate, a separator, an electrolyte, and a packaging bag.
The battery Management system 11, also referred to as bms (battery Management system), the battery Management system 11 is capable of executing the current collection detection method in any of the embodiments of the present application. The battery management system 11 is a set of control system for protecting the use safety of the battery cell module 10, and is used for monitoring the use state of the battery cell module 10. For example, the battery management system 11 can read the variation of the voltage, the current, the temperature, and other parameters of the battery cell module 10 in the charging or discharging process of the battery cell module 10, and then, can determine whether the battery cell module 10 is abnormal in real time.
It should be noted that fig. 1 is only an example of the battery pack 1. In other embodiments, the battery pack 1 may include more or fewer elements, or have a different arrangement of elements.
The embodiment of the application also provides an electric device, which comprises a load and the battery pack as shown in fig. 1. Wherein, this power consumption device can be for electronic motorcycle, electric bicycle, electric tool, unmanned aerial vehicle, cell-phone, panel computer, personal digital assistant, personal computer, energy storage product, or any other suitable device, and the battery package can be used to the load power supply for power consumption device.
Referring to fig. 2, fig. 2 is a flowchart of a current collection and detection method according to an embodiment of the present disclosure. The current acquisition and detection method comprises the following steps:
step 21: at a first moment, a first moment voltage or a first SOC value and a first threshold voltage are obtained.
Wherein, the SOC (State of charge) value is the ratio of the residual capacity of the battery to the nominal capacity of the battery. The first threshold voltage comprises a first discharge threshold voltage or a first charge threshold voltage. The first time voltage may be an open circuit voltage of the battery at the first time.
In one embodiment, the voltage at the first time can be directly obtained through the voltage acquisition loop. In another embodiment, after the first SOC value is obtained, a corresponding first-time voltage is obtained according to the SOC-OCV mapping relationship. The first SOC value is the ratio of the remaining capacity of the battery to the nominal capacity of the battery at the first moment.
In an embodiment, the first threshold voltage may be a voltage preset by a user. In another embodiment, the first threshold voltage may also be a voltage set according to a cell type or a material. For example, in the case of a lithium iron phosphate battery, the first threshold voltage may be set to 3.5V; in the case of a ternary battery, the first threshold voltage may be set to 4.2V.
Step 22: and acquiring real-time current in the charging or discharging process, and acquiring voltage or a second SOC value and electric quantity variation at a second moment according to the real-time current.
The second time voltage may be an open circuit voltage of the battery at the second time. In one embodiment, the voltage at the second moment can be directly obtained through the voltage acquisition loop. In other embodiments, the second time voltage may be directly obtained by the BMS.
In another embodiment, after the second SOC value is obtained, a corresponding second time voltage may be obtained according to the SOC-OCV mapping relationship.
It can be understood that, if the charging process is performed, the voltage at the second time and the first charging threshold voltage are both greater than the voltage at the first time; if the discharge process is carried out, the second moment voltage and the first discharge threshold voltage are both smaller than the first moment voltage.
The electric quantity variation includes a variation of an electric quantity of the battery or the battery cell during a charging or discharging process.
In one embodiment, the charge variation amount may be obtained by calculating an integral of the current. Specifically, the amount of change Q of the batterytComprises the following steps:
where I is the charging or discharging current, t is the end of charging or discharging, t0 is the time of just starting charging or discharging, dτRepresenting the integral over time. The quantity of change Q of the battery can be obtained by calculating the integral of the formulat. It is understood that time t0 may be a first time and time t may be a second time.
In one embodiment, during the charging or discharging process, the charging current is a positive current, and the calculated electric quantity variation is a positive value; in the discharging process, the discharging current is a negative current, and the calculated electric quantity variation is a negative value.
Step 23: and judging whether the current collection is abnormal or not according to the voltage-electric quantity mapping relation, the first threshold voltage, the electric quantity variation, the first moment voltage and the second moment voltage.
In an embodiment, before step 23 is executed, it is determined whether the voltage acquisition function is abnormal, so as to obtain a more accurate voltage at the first time or the second time, which is beneficial to improving the accuracy of detecting the current acquisition.
Specifically, the voltage of each battery cell and the total voltage of the battery pack are obtained in real time, where the battery pack includes at least one battery cell, and the battery cells may be connected in series and/or in parallel. And calculating the sum of the voltages of the battery cells, recording the sum as a voltage sum V1, acquiring the total voltage V2 of the battery pack through a BMS, and further calculating a difference V3 between the voltage sum V1 and the total voltage V2, namely V3 is equal to V1-V2. And if the absolute value of the difference value V3 is smaller than the first difference value, or the ratio V3/V2 of the absolute value of the difference value V3 and the total voltage V2 is smaller than the first ratio, judging that the voltage acquisition function is not abnormal.
On the contrary, if the absolute value of the difference V3 is greater than or equal to the first difference, or the ratio of the absolute value of the difference V3 to the total voltage is greater than or equal to the first ratio, it is determined that the voltage acquisition function is abnormal, and a prompt of a fault of the voltage acquisition function may be further output, for example, through an alarm text prompt or a buzzer prompt, etc. Meanwhile, the step 23 is not executed any more, which is beneficial to reducing misjudgment and improving the accuracy of current collection.
The first difference or the first ratio can be set according to an actual application situation, which is not specifically limited in the embodiment of the present application. For example, in an embodiment, the first difference value may be a product of the number of cells connected in series and a first voltage threshold (e.g., 5 mV). For another example, in another embodiment, the first ratio may be 3%, that is, the absolute value of the difference V3 is within 3% of the total voltage V2, and it may be determined that the voltage acquisition function is not abnormal.
In another embodiment, after it is determined that the voltage acquisition function is not abnormal, it is further determined whether current can be acquired so as to determine whether the battery cell is in a static state. If the current is not collected, the battery cell can be considered to be in a static state, and under the condition, the battery cell is not in a discharging state or a charging state. If the current is collected, the battery cell is in a non-static state, and in this case, the battery cell is in a discharging state or a charging state.
Specifically, N sets of current parameters are obtained within a first time period, and a first current average value in the N sets of current parameters is calculated, wherein N is a positive integer. And if the first current average value is larger than the first current threshold value, determining that the battery cell is in a non-standing state, and executing the step 23. For example, in an embodiment, N is 3,3 sets of current parameters are 500mA, 600mA and 550mA respectively, the first current threshold is set to 300mA, and the first current average value is (500+600+550)/3 ═ 550mA >300mA, it is determined that the battery cell is in the non-static state, and then, step 23 may be continuously performed.
It is understood that different first current thresholds may be set according to different practical application situations of the product, and this is not particularly limited in the embodiments of the present application. For example, in one embodiment, the first current threshold may be set to any one of 1A-3A for a larger power product application scenario (e.g., an industrial and commercial energy storage system). As another example, in another embodiment, for a smaller power product application scenario (e.g., a home energy storage system), the first current threshold may be set to any one of 200mA-500mA, and specifically, the first current threshold may be 300 mA.
In an embodiment, referring to fig. 3, the process of determining whether the current collection is abnormal in step 23 includes the following specific steps:
step 231: in the charging process, a first target electric quantity variable quantity is obtained according to the voltage at the first moment, the voltage-electric quantity mapping relation and the first charging threshold voltage.
In this embodiment, the battery is in a charged state. According to the voltage-to-power mapping relationship, the battery power Q1 corresponding to the first time voltage and the battery power Q2 corresponding to the first charging threshold voltage can be obtained. A difference Q3 between the electric quantity Q1 and the electric quantity Q2 is calculated, and the difference Q3 is used as the first target electric quantity variation.
In another embodiment, after calculating the difference Q3 between the electric quantity Q1 and the electric quantity Q2, an error coefficient is further combined to adapt to more different scenarios, which is beneficial to improving the practicability. The error coefficient may be set according to a user requirement or a detection precision requirement, which is not specifically limited in the embodiment of the present application. For example, in one embodiment, the error factor is set to ± 5%, i.e., the target charge capacity may take any value within the interval of [ Q3x 95%, Q3x 105% ]. It can be understood that if the first target electric quantity variation is set to a larger value, the misjudgment can be reduced, so as to improve the reliability; if the first target electric quantity variation is set to a small value, the detection duration can be shortened.
Step 232: and if the electric quantity variation is larger than the first target electric quantity variation and the voltage at the second moment is smaller than the first charging threshold voltage, determining that the current collection is abnormal.
During normal charging, both the charge and the voltage of the battery are increased. And, when the electric quantity variation QtIf the voltage is greater than the first target amount of charge variation Q3, the voltage at the second moment should be greater than the first charging threshold voltage accordingly.
On the contrary, if the voltage at the second moment is smaller than the first charging threshold voltage, the change characteristic of the voltage acquired by the voltage acquisition circuit and the change characteristic of the current acquired by the current acquisition circuit are contradictory, and the current acquisition circuit can be determined to be abnormal.
In another embodiment, referring to fig. 4, the process of determining whether the current collection is abnormal in step 23 includes the following specific steps:
step 233: and in the discharging process, acquiring a second target electric quantity variable quantity according to the voltage at the first moment, the voltage-electric quantity mapping relation and the first discharging threshold voltage.
In this embodiment, the battery is in a discharged state. According to the voltage-to-power mapping relationship, the battery power Q1 corresponding to the first time voltage and the battery power Q4 corresponding to the first discharge threshold voltage can be obtained. A difference Q5 between the electric quantity Q4 and the electric quantity Q1 is calculated, and the difference Q5 is used as the second target electric quantity variation.
Likewise, in another embodiment, an error factor may be further added after calculating the difference Q5 between charge Q4 and charge Q1. The setting manner of the error coefficient is similar to that of the error coefficient in step 231, which is within the range easily understood by those skilled in the art and is not described herein again.
Step 234: and if the electric quantity variation is larger than the second target electric quantity variation and the voltage at the second moment is larger than the first discharge threshold voltage, determining that the current collection is abnormal.
During the discharge process of the battery, both the charge and the voltage of the battery should be reduced. And, when the electric quantity variation QtIf the second target amount of power variation Q5 is greater, the voltage at the second moment should also be decreased to be less than the first discharge threshold voltage. If the voltage at the second moment is greater than the first discharge threshold voltage, it may be determined that current collection is abnormal.
In one embodiment, referring to fig. 5, the process of determining whether the current collection is abnormal in step 23 includes the following specific steps:
step 235: and if the voltage at the second moment is greater than the first charging threshold voltage and the electric quantity variation is a negative value, determining that the current collection is abnormal.
In this embodiment, the battery is in a charged state. During the charging process, the voltage is increasing, and the voltage can be increased to a second moment voltage greater than the first charging threshold voltage, so that the charging process and the voltage detection process are normal. Meanwhile, if the battery is in a charging state and the current is a positive current, the amount of change of the electric quantity obtained by the integration of the current should also be a positive value (i.e. the value of the amount of change of the electric quantity is greater than 0). In other words, if the amount of change of the electric quantity obtained at this time is a negative value (i.e., the value of the amount of change of the electric quantity is less than 0), it may be determined that the current collection is abnormal.
In another embodiment, referring to fig. 6, the process of determining whether the current collection is abnormal in step 23 includes the following specific steps:
step 236: and if the voltage at the second moment is smaller than the first discharging threshold voltage and the electric quantity variation is a positive value, determining that the current collection is abnormal.
In this embodiment, the battery is in a discharged state. In the discharging process, the voltage is reduced, and the voltage can be reduced to a voltage at a second moment which is smaller than the first discharging threshold voltage, so that the discharging process and the voltage detection process are normal. Meanwhile, if the battery is in a discharge state, the current is a negative current, and the amount of change in the amount of electricity obtained by the integration of the current should also be a negative value (i.e., the value of the amount of change in the amount of electricity is less than 0). In other words, if the amount of change of the electric quantity obtained at this time is a positive value (i.e., the value of the amount of change of the electric quantity is greater than 0), it may be determined that the current collection is abnormal.
In another embodiment, if the first current average value is less than or equal to the first current threshold, it can be determined whether the current collection is abnormal through the method steps shown in fig. 7. As shown in fig. 7, the method includes:
step 71: and acquiring a second time length for which the first current average value is smaller than the first current threshold value.
And judging that the battery is in the standing state through the first current average value being smaller than the first current threshold value, so that the second time length is the time length of the battery in the standing state.
It can be understood that after the charging or discharging is finished, the voltage gradually changes to the voltage of the static state due to the polarization effect of the battery. The polarization effect of the battery refers to a phenomenon that when current passes through the battery, the potential deviates from the equilibrium potential. By setting the second duration, the time from the voltage change to the voltage in the standing state can be staggered, so that whether the current collection is abnormal or not can be judged when the battery is in the standing state, and the misjudgment is favorably reduced.
Step 72: and if the second duration is longer than the first duration threshold, judging whether the current collection is abnormal according to the voltage or the total voltage of the single battery cell.
In an embodiment, if the second duration is greater than the first duration threshold, the variation amplitude of the voltage of the single battery cell is obtained in real time. And if the change amplitude of the voltage of the single battery cell is larger than the first voltage change threshold value, namely the voltage of the single battery cell has larger fluctuation, delaying for a third time. For example, in one embodiment, if the voltage of a single cell fluctuates by 10mV (i.e., the first variation threshold), the third time period is delayed.
In another embodiment, if the second duration is greater than the first duration threshold, the variation amplitude of the total voltage of the battery pack is obtained in real time. And if the change amplitude of the total voltage of the battery pack is greater than the second voltage change threshold value, namely the fluctuation of the total voltage of the battery pack is larger, delaying for a third time. For example, in one embodiment, if the total voltage of the battery pack fluctuates by 1V (i.e., the second variation threshold), the third period of time is delayed.
Then, M groups of current parameters are obtained in a third time period, and a second current average value in the M groups of current parameters is calculated, wherein M is a positive integer. According to the embodiment, when the voltage of a single battery cell or the total voltage of the battery pack fluctuates, the battery can be judged to be in a non-standing state. Then, if it is still detected that the second current average value is smaller than the first current threshold value, it contradicts that the battery is in the non-stationary state, and thus, it may be determined that the current collection is abnormal.
It is understood that, in this embodiment, different first time length thresholds may be correspondingly set according to different battery systems or according to different materials used for the batteries or according to different characteristics of the batteries, which is not specifically limited in this embodiment of the application. For example, the first time threshold may be set to 30 minutes to 60 minutes for a lithium iron phosphate battery, and 1 hour to 3 hours for a ternary battery.
Step 24: and judging whether the current collection is abnormal or not according to the voltage-electric quantity mapping relation, the first threshold voltage, the electric quantity variation, the first SOC value and the second SOC value.
In one embodiment, the first voltage is obtained by a first SOC value and the second voltage is obtained by a second SOC value. Furthermore, the first voltage corresponds to the first time voltage in step 23, and the second voltage corresponds to the second time voltage in step 23, and whether the current collection is abnormal or not can be determined through the same execution process as that of step 23, which is within the scope easily understood by those skilled in the art and will not be described herein again.
In conclusion, in the embodiment of the application, the method and the device can be suitable for detecting multiple abnormal conditions of current collection failure, and are favorable for improving the practicability. For example, the step shown in fig. 7 may detect an abnormal situation in which the power loop of the system has current but the current collecting loop does not collect current. For another example, through the steps shown in fig. 2, an abnormal situation that the power loop of the system has current but the current error collected by the current collecting loop is large can be detected. As another example, the abnormal situation that the power loop of the system has no current but the current collection loop collects false current can be detected through the steps shown in fig. 2.
Secondly, for the anomaly of current collection detected by adopting a chip in the related technology, the embodiment of the application combines various change parameters (such as voltage and current) in the charging or discharging process to detect whether the current collection is abnormal, so that misjudgment can be reduced, and the accuracy of current collection and detection can be improved.
Meanwhile, in the embodiment of the application, a software implementation strategy is formulated based on the voltage or the current in the charging or discharging process. On one hand, the current collection detection method is simple, the burden of a program in operation can be reduced, and the detection efficiency of current collection can be improved. On the other hand, compared with the related technology, the device such as a chip for detecting current failure can be reduced, and the cost is reduced.
Referring to fig. 8, fig. 8 is a flowchart of a current collection and detection method according to another embodiment of the present application. As shown in fig. 8, the method includes:
step 81: and continuously acquiring K groups of current parameters and L groups of voltage parameters, wherein K and L are positive integers larger than 2.
Step 82: and acquiring a first change trend of the current according to the K groups of current parameters.
In one embodiment, the K sets of current parameters are equally divided into J portions, where J is a positive integer greater than 1. The ratio of the sum of the current parameters in each section to the number of sets of current parameters was calculated to obtain the average of J currents. For example, in one embodiment, K is 4, J is 2, and 4 sets of current parameters are 100mA, 102mA, 103mA and 105mA, respectively, i.e., 4 sets of current parameters are divided into 2 sections, and the number of sets of current parameters in each section is 2. The first average current value is (100+ 102)/2-101 mA and the second average current value is (103+ 105)/2-104 mA.
Then, in one embodiment, the slope of the current can be obtained by linear fitting the J current averages by a least squares method. The first trend of the current can be obtained according to the slope of the current.
Step 83: and acquiring a second variation trend of the voltage according to the L groups of voltage parameters.
In one embodiment, the L sets of voltage parameters are evenly divided into I sections, where I is a positive integer greater than 1. The ratio of the sum of the voltage parameters in each section to the number of voltage parameter sets is calculated to obtain the average value of the I voltages.
Then, in one embodiment, the slope of the voltage can be obtained by linear fitting the average values of the I voltages by a least squares method. The second variation trend of the voltage can be obtained according to the slope of the voltage.
Step 84: and judging whether the current collection is abnormal or not according to the first change trend and the second change trend.
In an embodiment, whether the current collection is abnormal can be determined according to whether the first variation trend is the same as the second variation trend.
Specifically, if the slope of the current obtained in step 82 is the same as the slope of the voltage obtained in step 83, for example, the slope of the current and the slope of the voltage are both greater than 0, the first variation trend is the same as the second variation trend. On the contrary, if the direction of the slope of the current is different from that of the slope of the voltage, the first conversion trend is different from the second variation trend.
Further, if the first variation trend is the same as the second variation trend, the correct number is increased by one, and the process returns to step 81. If the first variation trend is different from the second variation trend, the number of errors is increased by one, and the process returns to step 81. And circulating to increase the number of correct times or error times.
Until the sum of the correct times and the error times is the total times threshold value. The total number threshold may be a preset value, or may be a value automatically obtained according to the detected type or material of the battery cell, which is not limited herein. And calculating the ratio of the error times to the total time threshold, and determining that the current collection is abnormal if the ratio is greater than a second ratio. Under normal conditions, the first variation trend is the same as the second variation trend, for example, during charging, both the voltage and the current increase, both the slope of the current and the slope of the voltage are greater than 0, and the first variation trend is the same as the second variation trend. Therefore, if the ratio of the error times to the total time threshold is greater than the second ratio, the probability that the first change trend is different from the second change trend is high, and it can be determined that the current collection is abnormal. In one embodiment, the second ratio may be set to 0.5%.
It will be appreciated that the greater the second ratio setting, the lower the probability of a false positive. I.e. by increasing the second ratio, the accuracy of the detection can be improved.
Referring to fig. 9, which shows a schematic structural diagram of a current collection and detection device provided in an embodiment of the present application, a current collection and detection device 90 includes: a first obtaining module 91, a second obtaining module 92 and an abnormality detecting module 93.
The first obtaining module 91 is configured to obtain a first time voltage or a first SOC value, and a first threshold voltage, where the first threshold voltage includes a first discharging threshold voltage or a first charging threshold voltage.
The second obtaining module 92 is configured to obtain a real-time current during the charging or discharging process, and obtain a voltage or a second SOC value at a second time and an electric quantity variation at the second time according to the real-time current.
The anomaly detection module 93 is configured to determine whether the current collection is abnormal according to the voltage-electric quantity mapping relationship, the first threshold voltage, the electric quantity variation, the first time voltage, and the second time voltage, or determine whether the current collection is abnormal according to the voltage-electric quantity mapping relationship, the first threshold voltage, the electric quantity variation, the first SOC value, and the second SOC value.
The product can execute the method provided by the embodiment of the application shown in fig. 2, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the methods provided in the embodiments of the present application.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments can also be combined, the steps can be implemented in any order and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (11)
1. A current collection detection method is characterized by comprising the following steps:
at a first moment, acquiring a first moment voltage or a first SOC value and a first threshold voltage, wherein the first threshold voltage comprises a first discharging threshold voltage or a first charging threshold voltage;
acquiring real-time current in the charging or discharging process, and acquiring voltage or a second SOC value at a second moment and electric quantity variation at the second moment according to the real-time current, wherein the electric quantity variation comprises the variation of electric quantity in the charging or discharging process;
and judging whether current collection is abnormal or not according to a voltage-electric quantity mapping relation, the first threshold voltage, the electric quantity variation, the first moment voltage and the second moment voltage, or judging whether current collection is abnormal or not according to the voltage-electric quantity mapping relation, the first threshold voltage, the electric quantity variation, the first SOC value and the second SOC value.
2. The method according to claim 1, wherein before the determining whether the current collection is abnormal according to the voltage-to-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first-time voltage, and the second-time voltage, or determining whether the current collection is abnormal according to the voltage-to-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first SOC value, and the second SOC value, the method further comprises:
acquiring N groups of current parameters in a first time period, and calculating a first current average value in the N groups of current parameters, wherein N is a positive integer;
if the first current average value is larger than a first current threshold value, whether current collection is abnormal or not is judged according to a voltage-electric quantity mapping relation, the first threshold voltage, the electric quantity variation, the first time voltage and the second time voltage, or whether current collection is abnormal or not is judged according to the voltage-electric quantity mapping relation, the first threshold voltage, the electric quantity variation, the first SOC value and the second SOC value.
3. The current collection and detection method of claim 2, wherein before said obtaining N sets of current parameters over a first time period and calculating a first current average of said N sets of current parameters, the method further comprises:
acquiring the voltage of each battery cell and the total voltage of a battery pack, wherein the battery pack comprises at least one battery cell;
if the absolute value of the difference between the sum of the voltages of the battery cells and the total voltage is smaller than a first difference value, or the ratio of the absolute value to the total voltage is smaller than a first ratio, N groups of current parameters are obtained within a first time period, and a first current average value in the N groups of current parameters is calculated.
4. The method according to claim 1, wherein the determining whether current collection is abnormal according to a voltage-to-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first-time voltage, and the second-time voltage, or determining whether current collection is abnormal according to the voltage-to-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first SOC value, and the second SOC value comprises:
in the charging process, acquiring a first target electric quantity variable quantity according to the first time voltage or the first SOC value, the voltage-electric quantity mapping relation and the first charging threshold voltage;
and if the electric quantity variation is larger than the first target electric quantity variation and the voltage at the second moment is smaller than the first charging threshold voltage, determining that the current collection is abnormal.
5. The method according to claim 1, wherein the determining whether current collection is abnormal according to a voltage-to-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first-time voltage, and the second-time voltage, or determining whether current collection is abnormal according to the voltage-to-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first SOC value, and the second SOC value comprises:
in the discharging process, acquiring a second target electric quantity variable quantity according to the first time voltage or the first SOC value, the voltage-electric quantity mapping relation and a first discharging threshold voltage;
and if the electric quantity variation is larger than the second target electric quantity variation and the second moment voltage is larger than the first discharge threshold voltage, determining that the current collection is abnormal.
6. The method according to claim 1, wherein the determining whether current collection is abnormal according to a voltage-to-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first-time voltage, and the second-time voltage, or determining whether current collection is abnormal according to the voltage-to-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first SOC value, and the second SOC value comprises:
and if the voltage at the second moment is greater than the first charging threshold voltage and the electric quantity variation is a negative value, determining that the current collection is abnormal.
7. The method according to claim 1, wherein the determining whether current collection is abnormal according to a voltage-to-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first-time voltage, and the second-time voltage, or determining whether current collection is abnormal according to the voltage-to-electric-quantity mapping relationship, the first threshold voltage, the electric-quantity variation, the first SOC value, and the second SOC value comprises:
and if the voltage at the second moment is smaller than the first discharge threshold voltage and the electric quantity variation is a positive value, determining that the current collection is abnormal.
8. The current collection detection method of claim 2, further comprising:
if the first current average value is smaller than the first current threshold, acquiring a second duration that the first current average value is smaller than the first current threshold;
and if the second duration is greater than the first duration threshold, judging whether current collection is abnormal according to the voltage of the single battery cell or the total voltage.
9. The current collection detection method according to claim 8, wherein the determining whether current collection is abnormal according to the voltage of the single battery cell or the total voltage includes:
if the change amplitude of the voltage of the single battery cell is larger than a first voltage change threshold value, or the change amplitude of the total voltage is larger than a second voltage change threshold value, delaying for a third time;
acquiring M groups of current parameters in a third time period, and calculating a second current average value in the M groups of current parameters, wherein M is a positive integer;
and if the second current average value is smaller than the first current threshold value, determining that current collection is abnormal.
10. A battery pack, comprising:
at least one cell for charging or discharging;
a battery management system coupled to the cells, the battery management system configured to perform the method of any of claims 1-9.
11. An electrical device comprising a load and the battery pack of claim 10, the battery pack being configured to power the load.
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