CN220709320U - SOC detection circuit of battery management system, battery management system and electric vehicle - Google Patents
SOC detection circuit of battery management system, battery management system and electric vehicle Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model discloses a battery management system and an SOC detection circuit thereof. The battery management system includes a main circuit and a control circuit, the main circuit being controlled by the control circuit. The SOC detection circuit of the battery management system comprises a first current acquisition module, a second current acquisition module and a calculation module. The first current acquisition module is connected in series to the main loop and is used for acquiring first current information of the main loop. The second current acquisition module is connected in series with the control loop and is used for acquiring second current information of the control loop. The calculation module is connected with the first current acquisition module and the second current acquisition module and is used for calculating the SOC value of the battery management system according to the first current information and the second current information. The technical scheme provided by the embodiment of the utility model can improve the accuracy of SOC calculation of the battery management system, and has simple structure and lower cost.
Description
Technical Field
The present utility model relates to the field of battery management systems, and in particular, to an SOC detection circuit for a battery management system, and an electric vehicle.
Background
SOC (State Of Charge) of a lithium battery system refers to the remaining capacity of the battery, and the accuracy of measurement is an important indicator of the battery management system. The prior art generally calculates the residual capacity by calculating the accumulated electric quantity by an ampere-hour integration method, and is widely applied to both power batteries and energy storage batteries. However, the current ampere-hour integration method for a low-voltage lithium battery system (for example, 12V voltage) records the electric quantity of the input and output batteries from the outside, ignores the change of the internal state of the battery management system, and because the electronic components in the battery management system take electricity from the battery itself, although the current is very small, the long-time electric quantity accumulation can affect the accuracy of calculating the SOC of the battery management system.
The existing SOC detection method of the lithium battery system has the problem of low detection precision, and becomes a technical problem to be solved in the industry.
Disclosure of Invention
The utility model provides an SOC detection circuit of a battery management system, the battery management system and an electric vehicle, which are used for solving the problem of low detection precision in the existing SOC detection method of a lithium battery system and improving the precision of SOC calculation of the battery management system.
According to an aspect of the present utility model, there is provided an SOC detection circuit of a battery management system, including:
the battery management system comprises a main loop and a control loop, wherein the main loop is controlled by the control loop;
an SOC detection circuit of a battery management system, comprising:
the first current acquisition module is connected in series with the main loop and is used for acquiring first current information of the main loop;
the second current acquisition module is connected in series with the control loop and is used for acquiring second current information of the control loop;
the calculation module is connected with the first current acquisition module and the second current acquisition module and is used for calculating the SOC value of the battery management system according to the first current information and the second current information.
According to another aspect of the present utility model, there is provided a battery management system including: the main loop, the control loop and the SOC detection circuit of the battery management system provided by any embodiment of the utility model;
and the SOC detection circuit of the battery management system is respectively connected with the main loop and the control loop and is used for detecting the total SOC value of the main loop and the control loop.
According to still another aspect of the present utility model, there is provided an electric vehicle including: the utility model provides an SOC detection circuit of a battery management system, which is provided by any embodiment; alternatively, it includes: the battery management system provided by any embodiment of the utility model.
According to the technical scheme, a first current acquisition module is connected in series with a main loop of a battery management system, so that first current information flowing through the main loop is acquired; and meanwhile, a second current acquisition module is connected in series with the control loop to acquire second current information flowing through the control loop, namely the self-consumption electric quantity of the control loop is considered. And calculating the SOC of the battery management system according to the first current information and the second current information through a calculating module. The SOC detection circuit of the battery management system is used for calculating the self-consumption electricity quantity of the control circuit and the SOC value of the electricity quantity of the main circuit, so that the error of the SOC detection circuit of the battery management system to the SOC calculation of the battery management system is reduced. Therefore, the technical scheme provided by the embodiment of the utility model can improve the accuracy of SOC calculation of the battery management system, has a simple structure and saves cost.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a battery management system and an SOC detection circuit of the battery management system according to an embodiment of the present utility model;
fig. 2 is a schematic structural diagram of another battery management system according to an embodiment of the present utility model connected to an SOC detection circuit of the battery management system;
fig. 3 is a schematic structural diagram of a connection between a battery management system and an SOC detection circuit of the battery management system according to an embodiment of the present utility model;
fig. 4 is a schematic structural diagram of a connection between a battery management system and an SOC detection circuit of the battery management system according to an embodiment of the present utility model;
fig. 5 is a schematic structural diagram of a connection between a battery management system and an SOC detection circuit of the battery management system according to an embodiment of the present utility model;
fig. 6 is a schematic circuit diagram of a connection between a battery management system and an SOC detection circuit of the battery management system according to an embodiment of the present utility model.
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a connection between a battery management system and an SOC detection circuit of the battery management system according to an embodiment of the present utility model, referring to fig. 1, the battery management system includes a main circuit 300 and a control circuit 200, and the main circuit 300 is controlled by the control circuit 200. The SOC detection circuit 100 of the battery management system includes a first current collection module 101, a second current collection module 102, and a calculation module 103. The first current collection module 101 is connected to the main circuit 300 in series, and the first current collection module 101 is used for collecting first current information of the main circuit 300. The second current collection module 102 is connected to the control loop 200 in series, and the second current collection module 102 is configured to collect second current information of the control loop 200. The calculating module 103 is connected to the first current collecting module 101 and the second current collecting module 102, and the calculating module 103 is used for calculating the SOC value of the battery management system according to the first current information and the second current information.
Specifically, the main circuit 300 of the battery management system is connected to a load or a charging power source, and the first current collection module 101 collects current information flowing through the main circuit 300 as first current information when the battery 303 is charged and discharged. Illustratively, the first current information is negative when the battery 303 is charged; the first current information is a positive value when the battery 303 is charged. Since the control loop 200 of the battery management system is responsible for controlling the main loop 300, the control loop 200 itself consumes power. Therefore, by providing the second current collection module 102 in series in the control loop 200 of the battery management system, the second current collection module 102 collects the current information flowing through the control loop 200 as the second current information.
Some examples of computing module 103 include, but are not limited to, a single-chip Microcomputer (MCU), a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various computing units running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, etc.
The first current acquisition module 101 and the second current acquisition module 102 respectively input the first current information and the second current information into the calculation module 103, and the calculation module 103 calculates the SOC of the battery management system according to a preset calculation rule. The first current acquisition module 101, the second current acquisition module 102 and the calculation module 103 together form the SOC detection circuit 100 of the battery management system, so that the influence of the self-consumed electric quantity of the control loop 200 on the calculation of the SOC of the battery management system is considered, and the error in the calculation of the SOC of the battery management system is reduced.
According to the technical scheme of the embodiment, a first current acquisition module 101 is connected in series with a main loop 300 of a battery management system to acquire first current information flowing through the main loop 300; meanwhile, the control loop 200 is connected in series with the second current acquisition module 102 to acquire second current information flowing through the control loop 200, namely, the self-consumption electric quantity of the control loop 200 is considered. The SOC of the battery management system is calculated by the calculation module 103 from the first current information and the second current information. The SOC detection circuit 100 of the battery management system thus configured calculates the SOC value of the self-consumed electric power amount of the control circuit 200 and the electric power amount of the main circuit, and reduces the error of the SOC calculation of the battery management system by the SOC detection circuit 100 of the battery management system. Therefore, the technical scheme provided by the embodiment improves the accuracy of SOC calculation of the battery management system, has a simple structure and saves cost.
Fig. 2 is a schematic circuit diagram of a connection between a battery management system and an SOC detection circuit of the battery management system according to an embodiment of the present utility model. Referring to fig. 2, the main circuit 300 of the battery management system may optionally include, based on the above embodiments: the first interface 301, the charge-discharge control module 302, and the battery 303 are connected in series, and the first interface 301 is used to connect a load or a charging power source.
The first current collection module 101 is connected between the first interface 301 and the battery 303, and the first current collection module 101 is used for collecting current flowing through the load of the main circuit 300.
Specifically, when the battery 303 is charged, the first interface 301 is connected to a charging power source, and the charging/discharging control module 302 controls the battery 303 to charge, and at this time, the first current collecting module 101 collects the charging current flowing through the main circuit 300. When the battery 303 is discharged, the first interface 301 is connected to the load, and the charge-discharge control module 302 controls the battery 303 to discharge, and at this time, the first current collecting module 101 collects the discharge current flowing through the load of the main circuit 300.
In this embodiment, by disposing the first current collection module 101 between the first interface 301 of the main circuit 300 and the battery 303, the charge and discharge control module 302 can collect the current of the main circuit 300 when controlling the charge and discharge of the battery 303, and the collected first current information can be used to calculate the SOC value. The device is simple in structure and beneficial to further improving the precision of SOC calculation.
Fig. 3 is a schematic structural diagram of still another connection between a battery management system and an SOC detection circuit 100 of the battery management system according to an embodiment of the present utility model, referring to fig. 3, optionally, the first current collecting module 101 includes a first sampling resistor 1011, a first end of the first sampling resistor 1011 is connected to the first interface 301 and the first sampling end 1031 of the computing module 103, and a second end of the first sampling resistor 1011 is connected to the second pole of the battery 303 and the second sampling end 1032 of the computing module 103.
Specifically, when the battery 303 is charged, the first interface 301 is connected to a charging power source, and the charge/discharge control module 302 controls the battery 303 to charge. At this time, a first end of the first sampling resistor 1011 is connected to a charging current, and collects information of the charging current and inputs the collected current information to the first sampling end 1031 of the calculation module 103. The charging current flows from the second terminal of the first sampling resistor 1011 into the second pole of the battery 303. When the battery 303 is discharged, the first interface 301 is connected to a load, and the charge/discharge control module 302 controls the battery 303 to discharge. At this time, the second end of the first sampling resistor 1011 receives a discharge current, and the discharge current flows into the load from the first end of the first sampling resistor 1011. The first sampling resistor 1011 collects information of the discharge current and inputs the collected current information to the first sampling terminal 1031 of the calculation module 103.
In this embodiment, by setting the first sampling resistor 1011 in the first current collecting module 101, two ends of the first sampling resistor 1011 are respectively connected with the first interface 301 and the second pole of the battery 303, so as to realize that when the battery 303 is charged or discharged, the current information of the main circuit 300 can be obtained by collecting the voltages at two ends of the first sampling resistor 1011 and utilizing ohm's law. The first sampling resistor 1011 is also connected with the calculation module 103, and the collected first current information is input into the calculation module 103 to calculate the SOC value. The device is simple in structure and beneficial to improving the precision of SOC calculation.
With continued reference to fig. 3, the control loop 200 is optionally connected to a battery 303 of the main loop 300, the battery 303 being used to power the control loop 200, on the basis of the embodiments described above. The second current collection module 102 is connected between the ground GND of the control loop 200 and the second pole of the battery 303, and the second current collection module 102 is configured to collect the self-consumption current of the control loop 200.
Specifically, the battery 303 of the main circuit 300 supplies power to the control circuit 200, and the power supply current flows into the control circuit 200, and after being consumed by the control circuit 200, flows through the ground GND of all the devices in the control circuit 200 and the second current collecting module 102, and flows to the second pole of the battery 303. The second current acquisition module 102 may acquire the current consumption information of the control loop 200.
In this embodiment, by disposing the second current acquisition module 102 between the ground GND of the control loop 200 and the second pole of the battery 303, the acquisition of the self-consumption current of the control loop 200 can be achieved, and the acquired first current information can be used to calculate the SOC value. The device is simple in structure and beneficial to further improving the precision of SOC calculation.
Fig. 4 is a schematic structural diagram of a connection between a battery management system and an SOC detection circuit of the battery management system according to an embodiment of the present utility model. Referring to fig. 4, optionally, the second current collecting module 102 includes a second sampling resistor 1021, where a first end of the second sampling resistor 1021 is connected to the second pole of the battery 303 and the third sampling end 1033 of the computing module 103, and a second end of the second sampling resistor 1021 is connected to the fourth sampling end 1034 of the computing module 103 and the ground GND.
Specifically, the current consumption of the control loop 200 flows to the second terminal of the second sampling resistor 1021 and the ground terminal GND of the common signal of all devices in the control loop 200, and at this time, the second sampling resistor 1021 collects the current information and inputs it to the fourth sampling terminal 1034 of the calculation module 103. After the self-current of the control loop 200 flows through the second sampling resistor 1021, the self-current flows into the second pole of the battery 303 from the first end of the second sampling resistor 1021, and at this time, the second sampling resistor 1021 collects the current information and inputs the current information into the third sampling end 1033 of the calculation module 103.
In this embodiment, by setting the second sampling resistor 1021 in the second current collecting module 102, two ends of the second sampling resistor 1021 are respectively connected with the ground GND of the control loop 200 and the second pole of the battery 303, so as to collect voltages at two ends of the second sampling resistor 1021, and obtain the consumption current information of the control loop 200 by using ohm's law. The second sampling resistor 1021 is also connected with the calculation module 103, and the acquired second current information is input into the calculation module 103 to calculate the SOC value. The device is simple in structure and beneficial to improving the precision of SOC calculation.
Fig. 5 is a schematic structural diagram of a connection between a battery management system and an SOC detection circuit of the battery management system according to an embodiment of the present utility model. Referring to fig. 5, the calculation module 103 may optionally include an analog-to-digital conversion unit 1035 and a signal processing unit 1036 on the basis of the above embodiments.
The analog-to-digital conversion unit 1035 is connected to the first current acquisition module 101 and the second current acquisition module 102, and the analog-to-digital conversion unit 1035 is configured to convert the first current information and the second current information into digital signals.
The signal processing unit 1036 is connected to the analog-to-digital conversion unit 1035, and the signal processing unit 1036 is configured to calculate an SOC value of the battery management system according to the first current information and the second current information after being converted into the digital signal.
Specifically, since the first current information and the second current information acquired by the first current acquisition module 101 and the second current acquisition module 102 are analog signals and cannot be directly calculated, the first current information and the second current information are converted into digital signals by the analog-to-digital conversion unit 1035. The first current information and the second current information converted into digital signals are input to the signal processing unit 1036, and the signal processing unit 1036 calculates an SOC value of the battery management system. Illustratively, the signal processing unit 1036 may implement a method for calculating an SOC value of a battery management system based on an ampere-hour integration method, which is based on the following principle: the current SOC value is calculated by calculating the relative varying charge of the battery 303 by continuously integrating the current over a period of time and the rated capacity of the battery 303. Illustratively, the mathematical expression is:
the SOC (t) is an SOC value of the battery 303 management system. SOC (t) 0 ) Is an initial SOC value determined based on the open circuit voltage. CN is the rated capacity of the battery 303. η is coulombic efficiency. I is current information consumed by the battery system, and is current information of the main circuit 300 in the prior art.
Since the current information consumed by the battery system includes the current information (i.e., first current information) flowing through the main loop 300 and the current information consumed by the control loop 200 (i.e., second current information), the signal processing unit 1036 may calculate the SOC value of the battery management system based on equation (1), where I is
First current information I 1 And second current information I 2 Sum of (d) and (d). The calculation may be implemented by existing program algorithms. It should be noted that, the SOC detection circuit of the battery management system provided in the embodiment of the present utility model may be used to execute other existing SOC calculation methods to calculate the SOC of the battery management system.
The coulombic efficiency, i.e., discharge efficiency, refers to the ratio of the discharge capacity of the battery 303 to the charge capacity during the same cycle, i.e., the percentage of the discharge capacity to the charge capacity.
In this embodiment, by setting the analog-to-digital conversion unit 1035 and the signal processing unit 1036 in the calculation module 103, the first current information and the second current information are converted into digital signals, so as to calculate the SOC value of the battery management system, which is beneficial to making the SOC calculation of the battery management system more accurate.
The embodiment of the utility model also provides a battery management system, which comprises a main loop 300, a control loop 200 and the SOC detection circuit 100 of the battery management system provided by any of the above embodiments of the utility model.
The SOC detection circuit 100 of the battery management system is connected to the main circuit 300 and the control circuit 200, respectively, and the SOC detection circuit 100 of the battery management system is configured to detect the total SOC value of the main circuit 300 and the control circuit 200.
Fig. 6 is a schematic circuit diagram of a connection between a battery management system and an SOC detection circuit of the battery management system according to an embodiment of the present utility model. Referring to fig. 6, the main circuit 300 may optionally include, based on the above embodiments: the first interface 301, the charge-discharge control module 302, and the battery 303 are connected in series, and the first interface 301 is used to connect a load or a charging power source.
The control loop 200 includes: the control module 201 and the switch driving module 202, the control module 201 is connected with the switch driving module 202, and the switch driving module 202 is used for generating driving signals according to the control signals of the control module 201. The driving signal is used for controlling the charge and discharge control module 302 to be turned on or off. The control module 201 is connected to a battery 303, the battery 303 being used to power the control module 201.
Optionally, the control loop 200 further includes a freewheel control circuit 203, an adoption circuit 204, a Pack diagnostic circuit 205, a power supply circuit 206, a boost circuit 207, an Analog Front-End (AFE) 208, a buck circuit 209, and a CAN communication module 210. The charge-discharge control module 302 further includes a first switch Q11, a second switch Qn1, a third switch Q12, a fourth switch Qn2, a first resistor R1, and a second resistor R2.
Specifically, when the battery 303 is charged, the first interface 301 is connected to a charging power source, and the battery 303 supplies power to the control module 201. The control module 201 controls the switch driving module 202 to generate a driving signal, and the driving signal controls the charge control module in the charge/discharge control module 302 to be turned on and controls the battery 303 to charge, so that the first current collecting module 101 collects the charging current flowing through the main circuit 300. When the battery 303 is discharged, the first interface 301 is connected to a load, and the battery 303 supplies power to the control module 201. The control module 201 controls the switch driving module 202 to generate a driving signal, and the driving signal controls the discharge control module in the charge-discharge control module 302 to be turned on and controls the battery 303 to discharge, so that the first current collecting module 101 collects the discharge current flowing through the load of the main circuit 300.
According to the technical scheme provided by the embodiment of the utility model, the control module 201 and the switch driving module 202 are arranged in the control loop 200 of the battery management system, so that the battery 303 is controlled to charge and discharge, and the SOC detection circuit 100 of the battery management system is matched, so that the calculation of the SOC of the battery management system can be realized. The technical scheme provided by the embodiment of the utility model can improve the accuracy of SOC calculation of the battery management system, has a simple structure and saves cost.
The embodiment of the utility model also provides an electric vehicle, which comprises the SOC detection circuit 100 of the battery management system provided by any embodiment of the utility model or comprises the battery management system provided by any embodiment of the utility model.
The electric vehicle provided by the embodiment of the utility model has the beneficial effects of the SOC detection circuit or the battery management system of the battery management system provided by any embodiment of the utility model, and the technical principle and the generated beneficial effects are similar and are not repeated.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present utility model may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present utility model are achieved, and the present utility model is not limited herein.
The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.
Claims (9)
1. An SOC detection circuit of a battery management system, comprising:
the battery management system comprises a main loop and a control loop, wherein the main loop is controlled by the control loop;
the SOC detection circuit of the battery management system includes:
the first current acquisition module is connected in series with the main loop and is used for acquiring first current information of the main loop;
the second current acquisition module is connected in series with the control loop and is used for acquiring second current information of the control loop;
the calculation module is connected with the first current acquisition module and the second current acquisition module, and is used for calculating the SOC value of the battery management system according to the first current information and the second current information.
2. The circuit of claim 1, wherein the main loop of the battery management system comprises: the charging and discharging control device comprises a first interface, a charging and discharging control module and a battery which are connected in series, wherein the first interface is used for connecting a load or a charging power supply;
the first current acquisition module is connected between the first interface and the battery and is used for acquiring the current of the main loop, which flows through the load.
3. The circuit of claim 2, wherein the first current acquisition module comprises:
the first sampling resistor is connected with the first interface and the first sampling end of the calculation module, and the second end of the first sampling resistor is connected with the second pole of the battery and the second sampling end of the calculation module.
4. A circuit according to any one of claims 1 to 3, wherein the control loop is connected to a battery of the main loop, the battery being used to power the control loop;
the second current acquisition module is connected between the grounding end of the control loop and the second pole of the battery, and is used for acquiring the consumable current of the control loop.
5. The circuit of claim 4, wherein the second current acquisition module comprises:
the first end of the second sampling resistor is connected with the second pole of the battery and the third sampling end of the calculation module, and the second end of the second sampling resistor is connected with the fourth sampling end of the calculation module and the grounding end.
6. The circuit of any one of claims 1 to 3,5, wherein the computing module comprises:
the analog-to-digital conversion unit is connected with the first current acquisition module and the second current acquisition module and is used for converting the first current information and the second current information into digital signals;
the signal processing unit is connected with the analog-to-digital conversion unit and is used for calculating the SOC value of the battery management system according to the first current information and the second current information after being converted into digital signals.
7. A battery management system, comprising: a main circuit, a control circuit, and an SOC detection circuit of the battery management system of any one of claims 1 to 6;
and the SOC detection circuit of the battery management system is respectively connected with the main loop and the control loop and is used for detecting the total SOC value of the main loop and the control loop.
8. The battery management system of claim 7, wherein,
the main circuit includes: the charging and discharging control device comprises a first interface, a charging and discharging control module and a battery which are connected in series, wherein the first interface is used for connecting a load or a charging power supply;
the control loop includes: the control module is connected with the switch driving module, and the switch driving module is used for generating a driving signal according to the control signal of the control module; the driving signal is used for controlling the charge-discharge control module to be turned on or turned off; the control module is connected with the battery, and the battery is used for supplying power to the control module.
9. An electric vehicle, characterized by comprising: the SOC detection circuit of the battery management system of any one of claims 1 to 6; alternatively, it includes: the battery management system of claim 7 or 8.
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| CN202322305685.8U CN220709320U (en) | 2023-08-25 | 2023-08-25 | SOC detection circuit of battery management system, battery management system and electric vehicle |
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