CN114487867A - Battery current detection method, battery management system and vehicle - Google Patents
Battery current detection method, battery management system and vehicle Download PDFInfo
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- CN114487867A CN114487867A CN202111676292.7A CN202111676292A CN114487867A CN 114487867 A CN114487867 A CN 114487867A CN 202111676292 A CN202111676292 A CN 202111676292A CN 114487867 A CN114487867 A CN 114487867A
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- 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
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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Abstract
A battery current detection method, a battery management system and a vehicle are provided. The method is applied to a battery management system and used for detecting the current value of the battery pack; the battery pack comprises a plurality of battery packs, and each battery pack comprises a plurality of single batteries; all the single batteries in the battery pack are connected in series on the bus; the bus is provided with a first current sensor and a second current sensor which are connected with the battery pack in series; the method comprises the following steps: acquiring a first acquisition result of the first current sensor to obtain a current first current detection value of the battery pack; acquiring a second acquisition result of the second current sensor to obtain a current second current detection value of the battery pack; and determining the current detection result of the battery pack based on the first current detection value and the second current detection value. By adopting the scheme, the reliability of detecting the current value of the battery can be improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to a battery current detection method, a battery management system and a vehicle.
Background
In recent years, with the rapid development of new energy industry in China, new energy vehicles are more and more popularized. The new energy vehicle can adopt a power battery as a power source, and the running state of the vehicle is determined by the state of a battery pack.
The current value of the power battery is an important parameter of the battery pack. Specifically, the current value of the power Battery is an important parameter of a Battery Management System (BMS), and many other parameters of the power Battery are estimated by an algorithm.
The existing scheme for detecting the current value of the power battery has poor detection reliability and cannot meet the functional safety requirement of a vehicle.
Disclosure of Invention
The invention aims to solve the problems that: how to improve the reliability of the battery current detection.
In order to solve the above problem, an embodiment of the present invention provides a battery current detection method, which is applied to a battery management system and is used for detecting a current value of a battery pack; the battery pack comprises a plurality of battery packs, and each battery pack comprises a plurality of single batteries; all the single batteries in the battery pack are connected in series on the bus; the bus is provided with a first current sensor and a second current sensor which are connected with the battery pack in series; the method comprises the following steps: acquiring a first acquisition result of the first current sensor to obtain a current first current detection value of the battery pack; acquiring a second acquisition result of the second current sensor to obtain a current second current detection value of the battery pack; and determining the current detection result of the battery pack based on the first current detection value and the second current detection value.
The embodiment of the invention also provides a battery management system, which is used for detecting the current value of the battery pack; the battery pack comprises a plurality of battery packs, and each battery pack comprises a plurality of single batteries; all the single batteries in the battery pack are connected in series on the bus; the bus is provided with a first current sensor and a second current sensor which are connected with the battery pack in series; the system comprises: the first detection unit is suitable for acquiring a first acquisition result of the first current sensor to obtain a current first current detection value of the battery pack; the second detection unit is suitable for acquiring a second acquisition result of the second current sensor to obtain a current second current detection value of the battery pack; and the determining unit is suitable for determining the current detection result of the battery pack based on the first current detection value and the second current detection value.
The embodiment of the invention also provides a vehicle which comprises the battery management system.
Embodiments of the present invention further provide a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the steps of any one of the methods described above.
Compared with the prior art, the technical scheme of the embodiment of the invention has the following advantages:
by applying the scheme of the invention, the current first current detection value of the battery pack is obtained by obtaining the first collection result of the first current sensor, the current second current detection value of the battery pack is obtained by obtaining the second collection result of the second current sensor, and the current detection result of the battery pack is determined based on the first current detection value and the second current detection value. Compared with the method for determining the current detection result of the battery pack based on only a single current detection value, the method and the device for determining the current detection result of the battery pack can improve the reliability of current detection, and further reduce the occurrence of safety accidents caused by the current detection problem.
Drawings
FIG. 1 is a flow chart of a method for detecting battery current according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a process for detecting battery current according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a battery management system according to an embodiment of the present invention.
Detailed Description
At present, when the current value of a power battery is detected, a current sensor is usually arranged on a bus (bus bar) of a battery pack, and the current sensor can detect the voltage at two ends of the current sensor, so that the current value of the battery pack can be obtained based on the output of the current sensor.
The current value of the battery pack is determined based on only one current sensor, and once the detection result is determined to be abnormal, the vehicle triggers emergency braking operation, so that a safety accident is caused.
By adopting the scheme for detecting the current value of the power battery, the reliability is poor, and the number of times of safety accidents caused by current problems is large, so that the vehicle is difficult to meet the functional safety requirement.
In order to solve the problem, the invention provides a battery current detection method, which is applied to the method, two current sensors are arranged on a bus, and a current detection value is obtained on the basis of each current sensor, so that the current value of a battery pack can be determined on the basis of the two obtained current detection values, and compared with the current detection result of the battery pack which is determined only on the basis of a single current value, the reliability of current detection can be improved, and further, the occurrence of safety accidents caused by the current detection problem is reduced.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The embodiment of the invention provides a battery current detection method. The method is applied to a battery management system and used for detecting the current value of the battery pack; the battery pack comprises a plurality of battery packs, and each battery pack comprises a plurality of single batteries; all the single batteries in the battery pack are connected in series on the bus; and the bus is provided with a first current sensor and a second current sensor which are connected with the battery pack in series.
Referring to fig. 1, the method may include the steps of:
and 11, acquiring a first acquisition result of the first current sensor to obtain a current first current detection value of the battery pack.
In an embodiment of the present invention, the battery is referred to as a battery pack. Referring to fig. 2, the battery pack 21 may include a plurality of battery packs 2101 to 210N, each battery pack including a plurality of unit batteries; all the single batteries in the battery pack are connected in series on the bus. The number of battery packs (i.e., the value of N) and the number of single batteries in each battery pack 210 are not limited. The battery pack 21 may power the load on the bus bar. Wherein N is a positive integer greater than or equal to 2.
In particular implementation, referring to fig. 2, the bus of battery pack 21 may include a positive bus bar1, a middle bus bar2, and a negative bus bar 3. One end of the positive bus BUSBAR1 is connected to the anode of the battery pack 21, and the other end is connected to the power supply voltage. One end of the negative bus BUSBAR3 is connected to the cathode of the battery pack 21, and the other end is connected to the ground. The bus between adjacent battery packs is a middle bus bar 2. For example, the bus bar between the battery pack 2101 and the battery pack 2102 and the bus bar between the battery pack 2102 and the battery pack 2103 are intermediate bus bars.
Referring to fig. 2, the first current sensor 22 and the second current sensor 23 are provided on the bus bar and connected in series with the battery pack 21. The first current sensor 22 may be located on the positive bus bar1 or the negative bus bar 3. The second current sensor 23 may be located on the positive bus bar1 or the negative bus bar 3.
In an embodiment of the present invention, since the voltage on negative bus bar3 is less than the voltage on positive bus bar1, first current sensor 22 and second current sensor 23 can be disposed on negative bus bar3 in consideration of the voltage resistance of the current sensors themselves.
The current sensor can be divided into a current divider, an electronic current transformer and the like according to different measurement principles. The electronic current transformer can be a hall sensor.
In one embodiment of the present invention, the first current sensor 22 may be configured as a shunt, and the second current sensor 23 may be configured as a hall sensor.
In other embodiments, the first current sensor 22 may be another current sensor, and the second current sensor 23 may be another current sensor. The first current sensor 22 and the second current sensor 23 may be the same type of current sensor or different types of current sensors.
The direct output results of the current divider and the Hall sensor are voltage values. For example, when the current value to be measured is in the range of [0A, 500A ], the output voltage amplitude of the used shunt is about [ -75mv, 75mv ], and the output voltage amplitude of the hall sensor is about [0V, 5V ].
In a specific implementation, a first detection unit self-arranged by the BMS may be used to obtain a first collection result of the first current sensor, so as to obtain a current first current detection value of the battery pack. The structure of the first detection unit may be various, and is not particularly limited.
And step 12, obtaining a second acquisition result of the second current sensor to obtain a current second current detection value of the battery pack.
In a specific implementation, referring to fig. 2, a second detection unit self-configured by the BMS system may be used to obtain a second acquisition result of the second current sensor 23, and a ratio of a voltage across the second current sensor 23 to an impedance of the second current sensor 23 itself may be used as a current value flowing through the second current sensor 23. Since the second current sensor 23 is connected in series with the battery pack 21, the value of the current flowing through the second current sensor 23 is the current second current detection value of the battery pack 21.
In specific implementation, the structure of the second detection unit may be various, and is not limited.
And step 13, determining the current detection result of the battery pack based on the first current detection value and the second current detection value.
In a specific implementation, the determining the current detection result of the battery pack based on the first current detection value and the second current detection value may include any one of:
when the first current detection value is abnormal but the second current detection value is normal, taking the second current detection value as the current detection result of the battery pack;
when the first current detection value is normal but the second current detection value is abnormal, taking the first current detection value as the current detection result of the battery pack;
and when the first current detection value and the second current detection value are both normal, taking the minimum value of the first current detection value and the second current detection value as the current detection result of the battery pack.
The first current detection value is abnormal, for example, the first current detection value is always zero, the first current detection value is always the maximum value, or the first current detection value irregularly jumps (for example, from zero to the maximum value). The person skilled in the art can determine whether the first current detection value is abnormal based on the variation of the first current detection value.
The second current detection value is abnormal, for example, the second current detection value is always zero, the second current detection value is always the maximum value, or the second current detection value irregularly jumps (for example, from zero to the maximum value). The person skilled in the art can determine whether the second current detection value is abnormal based on the variation of the second current detection value.
The difference between the first normal current detection value and the second normal current detection value is usually smaller than a preset difference threshold. The value range of the preset difference threshold value can be (-200A). That is, the difference between the first current detection value in the normal case and the second current detection value in the normal case is small. When the first current detection value and the second current detection value are both normal, the minimum value can be used as the current detection result of the battery pack.
In some embodiments, when the first current detection value and the second current detection value are both normal, the first current detection value can be used as the current detection result of the battery pack because the first current detection value can better meet the requirements of current accuracy and current magnitude.
When the second current detection value obtained by the current sensor has a problem, the current value of the battery pack can be obtained according to the first current detection value, and the current is not only abnormal because the second current detection value has a problem, namely the current is judged, so that the safety accidents caused by the current detection problem can be greatly reduced. Similarly, when the first current detection value of the bus in the preset length section has a problem, the current value of the battery pack can be obtained according to the second current detection value, and the current is not only determined to be abnormal because the first current detection value has a problem, so that the safety accident caused by the current detection problem can be greatly reduced.
As can be seen from the above, in the battery current detection method according to the embodiment of the invention, the current detection result of the battery pack is determined based on the first current detection value and the second current detection value, rather than the current detection result of the battery pack being determined based on only a single current detection value, so that the reliability of the circuit detection can be effectively improved.
In order to make those skilled in the art better understand and implement the present invention, the battery current detection system and the vehicle corresponding to the above method will be described in detail below.
Referring to fig. 3, an embodiment of the present invention provides a battery management system 30, where the system 30 is configured to detect a current value of a battery pack; the battery pack comprises a plurality of battery packs, and each battery pack comprises a plurality of single batteries; all the single batteries in the battery pack are connected in series on the bus. And the bus is provided with a first current sensor and a second current sensor which are connected with the battery pack in series.
The system 30 comprises: a first detection unit 31, a second detection unit 32 and a determination unit 33.
Wherein:
the first detection unit 31 is adapted to obtain a first acquisition result of the first current sensor to obtain a current first current detection value of the battery pack;
the second detection unit 32 is adapted to obtain a second acquisition result of the second current sensor to obtain a current second current detection value of the battery pack;
the determining unit 33 is adapted to determine a current detection result of the battery pack based on the first current detection value and the second current detection value.
In the embodiment of the present invention, the first detecting unit 31 and the second detecting unit 32 may be both detecting units of the BMS. The structures of the first detection unit 31 and the second detection unit are not limited.
In one embodiment of the present invention, the first current sensor 22 may be configured as a shunt, and the second current sensor 23 may be configured as a hall sensor.
In other embodiments, the first current sensor 22 may be another current sensor, and the second current sensor 23 may be another current sensor. The first current sensor 22 and the second current sensor 23 may be the same type of current sensor, or may be different types of current sensors, and are not limited herein.
In an embodiment of the present invention, referring to fig. 2, the bus of the battery pack 21 may include a positive bus bar1 and a negative bus bar 3. The first current sensor 22 and the second current sensor 23 may both be located on the negative bus bar 3.
In a specific implementation, referring to fig. 2, the first detection unit 31 may obtain a collection result output by the first current sensor 22, and use a ratio between the collection result and the impedance of the first current sensor 22 itself as the first current detection value.
In a specific implementation, referring to fig. 2, the second detection unit 32 may be electrically connected to the second current sensor 23, so that a voltage value across the second current sensor 23 may be acquired, and thus a ratio between the voltage value across the second current sensor 23 and an impedance value of the second current sensor 23 itself may be taken as the second current detection value.
The determination unit 33 may determine the second current detection value as the current detection result of the battery pack when the first current detection value is abnormal but the second current detection value is normal, or determine the first current detection value as the current detection result of the battery pack when the first current detection value is normal but the second current detection value is abnormal, or determine the minimum value of the first current detection value and the second current detection value as the current detection result of the battery pack when the first current detection value and the second current detection value are both normal. The implementation is specifically described with reference to the above description of step 13, and details are not repeated here.
The embodiment of the present invention further provides a vehicle, and the vehicle is integrated with the battery current detection system 30. The battery current detection system 30 is used for current detection, so that the reliability is high, safety accidents caused by current detection problems can be reduced, and the safety of vehicles is improved.
Each module/unit included in each apparatus and product described in the above embodiments may be a software module/unit, or may also be a hardware module/unit, or may also be a part of a software module/unit and a part of a hardware module/unit. For example, for each device or product applied to or integrated into a chip, each module/unit included in the device or product may be implemented by hardware such as a circuit, or at least a part of the module/unit may be implemented by a software program running on a processor integrated within the chip, and the rest (if any) part of the module/unit may be implemented by hardware such as a circuit; for each device or product applied to or integrated with the chip module, each module/unit included in the device or product may be implemented by using hardware such as a circuit, and different modules/units may be located in the same component (e.g., a chip, a circuit module, etc.) or different components of the chip module, or at least some of the modules/units may be implemented by using a software program running on a processor integrated within the chip module, and the rest (if any) of the modules/units may be implemented by using hardware such as a circuit; for each device and product applied to or integrated in the terminal, each module/unit included in the device and product may be implemented by using hardware such as a circuit, and different modules/units may be located in the same component (e.g., a chip, a circuit module, etc.) or different components in the terminal, or at least part of the modules/units may be implemented by using a software program running on a processor integrated in the terminal, and the rest (if any) part of the modules/units may be implemented by using hardware such as a circuit.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The battery current detection method is applied to a battery management system and used for detecting the current value of a battery pack; the battery pack comprises a plurality of battery packs, and each battery pack comprises a plurality of single batteries; all the single batteries in the battery pack are connected in series on the bus; the bus is provided with a first current sensor and a second current sensor which are connected with the battery pack in series; the method comprises the following steps:
acquiring a first acquisition result of the first current sensor to obtain a current first current detection value of the battery pack;
acquiring a second acquisition result of the second current sensor to obtain a current second current detection value of the battery pack;
and determining the current detection result of the battery pack based on the first current detection value and the second current detection value.
2. The battery current sensing method of claim 1, wherein the first current sensor is a shunt.
3. The battery current sensing method of claim 1, wherein the second current sensor is a hall sensor.
4. The battery current detection method according to claim 1, wherein the bus bar includes: the positive bus is connected with the anode of the battery pack, and the negative bus is connected with the cathode of the battery pack; the first current sensor and the second current sensor are both located on the negative bus.
5. The battery current detection method according to claim 1, wherein the determining the current detection result of the battery pack based on the first current detection value and the second current detection value includes any one of:
when the first current detection value is abnormal but the second current detection value is normal, taking the second current detection value as the current detection result of the battery pack;
when the first current detection value is normal but the second current detection value is abnormal, taking the first current detection value as the current detection result of the battery pack;
and when the first current detection value and the second current detection value are both normal, taking the minimum value of the first current detection value and the second current detection value as the current detection result of the battery pack.
6. A battery management system is characterized in that the system is used for detecting the current value of a battery pack; the battery pack comprises a plurality of battery packs, and each battery pack comprises a plurality of single batteries; all the single batteries in the battery pack are connected in series on the bus; the bus is provided with a first current sensor and a second current sensor which are connected with the battery pack in series; the system comprises:
the first detection unit is suitable for acquiring a first acquisition result of the first current sensor to obtain a current first current detection value of the battery pack;
the second detection unit is suitable for acquiring a second acquisition result of the second current sensor to obtain a current second current detection value of the battery pack;
and the determining unit is suitable for determining the current detection result of the battery pack based on the first current detection value and the second current detection value.
7. The battery management system of claim 6, wherein the first current sensor is a shunt.
8. The battery management system of claim 6, wherein the second current sensor is a Hall sensor.
9. The battery management system of claim 6, wherein the bus bar comprises: the positive bus is connected with the anode of the battery pack, and the negative bus is connected with the cathode of the battery pack; the first current sensor and the second current sensor are both located on the negative bus.
10. A vehicle characterized by comprising the battery current detection system according to any one of claims 6 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111676292.7A CN114487867A (en) | 2021-12-31 | 2021-12-31 | Battery current detection method, battery management system and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111676292.7A CN114487867A (en) | 2021-12-31 | 2021-12-31 | Battery current detection method, battery management system and vehicle |
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| CN114487867A true CN114487867A (en) | 2022-05-13 |
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| CN202111676292.7A Pending CN114487867A (en) | 2021-12-31 | 2021-12-31 | Battery current detection method, battery management system and vehicle |
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- 2021-12-31 CN CN202111676292.7A patent/CN114487867A/en active Pending
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