CN117647716A - MOS state detection circuit, method and battery management system - Google Patents
MOS state detection circuit, method and battery management system Download PDFInfo
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- CN117647716A CN117647716A CN202311650769.3A CN202311650769A CN117647716A CN 117647716 A CN117647716 A CN 117647716A CN 202311650769 A CN202311650769 A CN 202311650769A CN 117647716 A CN117647716 A CN 117647716A
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- 238000001514 detection method Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000007599 discharging Methods 0.000 claims abstract description 72
- 230000008859 change Effects 0.000 claims description 22
- 238000012986 modification Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
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- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention provides a MOS state detection circuit, a method and a battery management system, and belongs to the technical field of battery management. The MOS state detection circuit comprises a plurality of branch circuits which are formed by a charging MOS unit, a discharging MOS unit and a current detection unit, wherein the charging MOS unit is connected with the discharging MOS unit, the current detection unit is connected with the rear of the charging MOS unit and the discharging MOS unit, and the charging MOS unit, the discharging MOS unit and the current detection unit are all connected with a main control unit, wherein the main control unit is used for collecting voltage information at two ends of the current detection unit to judge whether current flows through the branch circuits or not, controlling the on-off of the charging MOS unit and the discharging MOS unit, and detecting which MOS unit is damaged when the MOS units are in a parallel state.
Description
Technical Field
The invention relates to the technical field of battery management, in particular to a MOS state detection circuit, a method and a battery management system.
Background
The battery management system (Battery Management System, BMS) is a key device for monitoring, managing and protecting a battery pack, and is mainly applied to various types of rechargeable batteries, such as lithium ion batteries, nickel metal hydride batteries, etc., the battery management system can monitor parameters of voltage, current, temperature, state, etc., in a battery pack composed of a plurality of battery cells, the battery management system can ensure that each battery cell is charged and discharged uniformly to prevent some of the cells from being overcharged or overdischarged, and in addition, the battery management system can control the charging of the battery pack, including charging current and charging cutoff voltage, which helps to prevent the overcharge of the battery during the charging, thereby improving safety, and the battery management system can control the discharging of the battery pack, ensure that the battery is not overdischarged, thereby extending the life of the battery.
In order to further reduce the cost and compress the product space, the battery management system carried by the current low-voltage product starts to use MOS units to replace the switching action of the traditional relay in the circuit, but meanwhile, the product needs to consider the working condition of large current, so that the capability of realizing excessive current by using a plurality of MOS units in parallel connection is caused, but due to the fact that the MOS units are in parallel connection, the structure is difficult to detect which MOS unit is damaged through the current detection circuit.
Disclosure of Invention
The embodiment of the invention provides a detection circuit, a detection method and a battery management system for MOS states, which solve the technical problem that in the prior art, because MOS is in a parallel state, the detection of which MOS unit is damaged is difficult to be performed through the existing detection circuit.
In view of the foregoing, in a first aspect, an embodiment of the present invention provides a detection circuit for a MOS state, the detection circuit for a MOS state including: the charging MOS unit is connected with the discharging MOS unit, the current detection unit is connected to the rear of the charging MOS unit and the discharging MOS unit, the charging MOS unit, the discharging MOS unit and the current detection unit are all connected with the main control unit, wherein the main control unit is used for collecting voltage information at two ends of the current detection unit to judge whether current flows through the branch circuit or not, and controlling on-off of the charging MOS unit and the discharging MOS unit.
In one embodiment, the current detection unit employs a shunt resistor.
In one embodiment, the plurality of branch circuits are connected in parallel with each other.
In one embodiment, the MOS state detection circuit further includes a power module, the power module is connected to the charging MOS unit, the charging MOS unit is connected to the discharging MOS unit, and the discharging MOS unit is connected to the current detection unit.
In a second aspect, an embodiment of the present invention provides a method for detecting a MOS state, where the method is applied to a circuit for detecting a MOS state as set forth in any one of the foregoing, and the method includes:
the main control unit collects voltage information at two ends of the current detection unit to judge whether current flows through the branch circuit or not;
when the current detection unit detected by the main control unit has no voltage, the branch circuit has no current, and the charging MOS unit or the discharging MOS unit is disconnected;
the main control unit controls the on-off of the charging MOS unit and the discharging MOS unit, and judges whether the charging MOS unit is damaged or the discharging MOS unit is damaged according to the voltage change.
In one embodiment, the main control unit controls on/off of the charging MOS unit and the discharging MOS unit, and determines whether the charging MOS unit is damaged or the discharging MOS unit is damaged according to the voltage change, which specifically includes:
the charging MOS units are controlled to be disconnected once through the main control unit, and whether the charging MOS units are damaged or not is judged specifically according to the voltage change among the charging MOS units.
In one embodiment, the step of controlling the charging MOS unit to be turned off once through the main control unit, and judging whether the charging MOS unit is damaged or not according to the voltage variation between the charging MOS units specifically includes:
the voltage at two ends of the charging MOS unit is V1 and V2 respectively, and after the main control unit controls the charging MOS unit to be disconnected, if V1-V2 = 0, the branch circuit is judged to be disconnected for the charging MOS unit;
if V1-v2=full package voltage, then the bypass circuit is judged to be open for the discharge MOS cell.
In one embodiment, the main control unit controls on/off of the charging MOS unit and the discharging MOS unit, and determines whether the charging MOS unit is damaged or the discharging MOS unit is damaged according to the voltage change, which specifically includes:
the main control unit controls the discharge MOS units to be disconnected once, and whether the charging MOS units are damaged or not is judged according to the voltage change among the discharge MOS units.
In one embodiment, the step of controlling the discharge MOS unit to be turned off once by the main control unit and judging whether the charge MOS unit is damaged or not according to the voltage variation between the discharge MOS units specifically includes:
the voltage at two ends of the discharging MOS unit is V2 and V3 respectively, and after the main control unit controls the discharging MOS unit to be disconnected, if V2-V3 = 0, the branch circuit is judged to be disconnected as the charging MOS;
if V2-v3=full packet voltage, then the bypass circuit is judged to be open for discharging MOS.
In a third aspect, an embodiment of the present invention provides a battery management system, including a MOS state detection circuit as described in the above aspect.
The above-mentioned one or more technical solutions in the embodiments of the present application at least have one or more of the following technical effects:
the MOS state detection circuit provided by the embodiment of the invention comprises: the charging MOS unit is connected with the discharging MOS unit, the current detection unit is connected to the rear of the charging MOS unit and the discharging MOS unit, the charging MOS unit, the discharging MOS unit and the current detection unit are all connected with the main control unit, the charging MOS unit or the discharging MOS unit of which branch circuit is in an off state is positioned by adding the current detection unit to the branch circuit, after the disconnected branch circuit is locked, the main control unit controls the charging MOS unit or the discharging MOS unit on the branch circuit to be disconnected, and finally the charging MOS unit or the discharging MOS unit is in the off state or the off state is locked according to the change of the voltage before and after disconnection, so that when the MOS units are in a parallel state, the damage of which MOS unit is detected is realized.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic block diagram of a MOS state detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic block diagram of a MOS state detection circuit according to an embodiment of the invention.
Reference numerals illustrate: 100. a bypass circuit; 110. a charging MOS unit; 120. a discharge MOS unit; 130. a current detection unit; 200. a main control unit; 300. and a power supply module.
Detailed Description
The embodiment of the invention provides a detection circuit, a detection method and a battery management system for MOS states, which are used for solving the technical problem that in the prior art, because MOS is in a parallel state, the detection of which MOS unit is damaged is difficult to be performed through the existing detection circuit.
The technical scheme provided by the invention has the following overall thought:
referring to fig. 1, the mos state detection circuit includes: the charging MOS unit 110 is connected with the discharging MOS unit 120, the current detecting unit 130 is connected behind the charging MOS unit 110 and the discharging MOS unit 120, the charging MOS unit 110, the discharging MOS unit 120 and the current detecting unit 130 are all connected with the main control unit 200, wherein the main control unit 200 is used for collecting voltage information at two ends of the current detecting unit 130 to judge whether the current flows through the branch circuit 100, and controlling the on-off of the charging MOS unit 110 and the discharging MOS unit 120.
Wherein the charging MOS unit 110 is used to control the charging operation in the circuit, the charging MOS unit 110 may direct current into a battery or other load for charging. They are connected with the main control unit 200 to receive an instruction from the main control unit to open or close the current path; the discharging MOS unit 120 is used for controlling a discharging operation in the circuit, the discharging MOS unit 120 may output electric energy of the battery into the load, and the discharging MOS unit 120 is also connected with the main control unit 200 to receive an instruction to open or close a current path, similar to the charging MOS unit 110; the current detecting unit 130 is used for detecting the current, and a current detecting component such as a hall sensor may be generally used, and the current detecting unit 130 may measure the current passing through the charge MOS unit 110 and the discharge MOS unit 120 and transmit the relevant current information to the main control unit 200; the main control unit 200 is a central processing unit of the system, and is responsible for controlling the on-off of the charging MOS unit and the discharging MOS unit, and processing and analyzing the data of the current detection unit 130, and the main control unit 200 is further configured to determine whether a current flows in the circuit, so as to determine whether the charging MOS unit 110 and the discharging MOS unit 120 need to be turned on or off.
In the design, a method of adding a current detection unit 130 to a branch circuit 100 is used for positioning a charging MOS unit 110 or a discharging MOS unit 120 of which branch circuit 100 is in an off state, after the off branch circuit 100 is locked, the main control unit 200 is used for controlling the charging MOS unit 110 or the discharging MOS unit 120 on the branch circuit 100 to be off, and whether the charging MOS unit 110 is in the off state or the discharging MOS unit 120 is in the off state is finally locked according to the change of the voltage before and after the off, so that when the MOS units are in the parallel state, the damage of which MOS unit is detected is realized.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Further, the current detecting unit 130 employs a shunt resistor, which is a special resistor placed in a circuit for measuring a current, and a voltage drop is generated across the shunt resistor when the current passes through the shunt resistor, and by measuring the voltage drop, a current value passing through the shunt resistor can be determined. In this design, after the shunt resistor is connected to the charging MOS unit 110 and the discharging MOS unit 120 to monitor the current in the subcircuit 100, the main control unit 200 collects the voltage information of the two ends of the shunt resistor, and then uses the information to determine whether the shunt circuit 100 has current flowing through, and the shunt resistor is adopted because the component has small size and low price compared with other current detection elements, and the collection accuracy is similar to that of a hall sensor.
Further, several subcircuits 100 are connected in parallel with each other.
Further, referring to fig. 2, a MOS state detection circuit further includes a power module 300, the power module 300 is connected to the charging MOS unit 110, the charging MOS unit 110 is connected to the discharging MOS unit 120, the discharging MOS unit 120 is connected to the current detection unit 130, the power module 300 provides electric energy to guide current to the charging MOS unit 110 to implement charging operation, the charging MOS unit 110 is connected to two units of the discharging MOS unit 120 to implement charging and discharging operation, the charging MOS unit 110 guides current to a battery or a load, the discharging MOS unit 120 outputs electric energy of the battery to the load, and by connecting the current detection unit 130 to the discharging MOS unit 120, the current detection unit 130 is able to detect current passing through the charging MOS unit 110 and the discharging MOS unit 120.
Example two
The embodiment of the invention provides a method for detecting a MOS state, which comprises the following steps:
the main control unit 200 collects voltage information at two ends of the current detection unit 130 to determine whether the current flows through the branch circuit 100;
when the current detection unit 130 detected by the main control unit 200 has no voltage, it indicates that the bypass circuit 100 has no current, and indicates that the charging MOS unit 110 or the discharging MOS unit 120 is turned off;
the main control unit 200 controls the on-off of the charge MOS unit 110 and the discharge MOS unit 120, and determines whether the charge MOS unit 110 is damaged or the discharge MOS unit 120 is damaged according to the voltage variation.
Further, the main control unit 200 controls the on/off of the charging MOS unit 110 and the discharging MOS unit 120, and determines whether the charging MOS unit 110 is damaged or the discharging MOS unit 120 is damaged according to the voltage change, which specifically includes:
the charging MOS unit 110 is controlled to be turned off once by the main control unit 200, and it is determined whether the charging MOS unit 110 is damaged or the charging MOS unit 110 is damaged in particular according to a voltage change between the charging MOS units 110.
Further, the step of controlling the charge MOS unit 110 to be turned off once by the main control unit 200, and judging whether the charge MOS unit 110 is damaged or the charge MOS unit 110 is damaged according to the voltage variation between the charge MOS units 110 specifically includes:
the voltages at the two ends of the charging MOS unit 110 are V1 and V2, specifically, the voltages at the two ends of the charging MOS unit 110 may be measured and recorded as V1 and V2, respectively, and after the main control unit 200 controls the charging MOS unit 110 to be turned off, if v1—v2=0 represents v2=v1, that is, the voltage does not change, it is determined that the branch circuit 100 is turned off for the charging MOS unit 110, which indicates that the problem in the branch circuit 100 is the charging MOS unit 110;
if v1—v2=full package voltage, i.e., the voltage variation is equal to the overall voltage of the battery, then the bypass circuit 100 is judged to be open for the discharge MOS cell 120, indicating that the discharge MOS cell 120 is problematic in the bypass circuit 100.
Further, the main control unit 200 controls the on/off of the charging MOS unit 110 and the discharging MOS unit 120, and determines whether the charging MOS unit 110 is damaged or the discharging MOS unit 120 is damaged according to the voltage change, which specifically includes:
the discharge MOS unit 120 is controlled to be turned off once by the main control unit 200, and it is determined whether the charge MOS unit 110 is damaged or the charge MOS unit 110 is damaged in particular according to a voltage change between the discharge MOS units 120.
Further, the step of controlling the discharge MOS unit 120 to be turned off once by the main control unit 200, and judging whether the charge MOS unit 110 is damaged or the charge MOS unit 110 is damaged according to the voltage variation between the discharge MOS units 120, specifically includes:
the voltages at two ends of the discharging MOS unit 120 are V2 and V3, specifically, the voltages at two ends of the discharging MOS unit 120 may be measured and recorded as V2 and V3, respectively, and after the main control unit 200 controls the discharging MOS unit 120 to be turned off, if v2—v3=0, it represents v2=v3, that is, the voltage does not change, it is determined that the branch circuit 100 is turned off for the charging MOS unit 110, which indicates that the problem in the branch circuit 100 is the charging MOS unit 110;
if v2—v3=full package voltage, i.e., the voltage change is equal to the overall voltage of the battery, then the bypass circuit 100 is determined to be open for the discharge MOS cell 120, indicating that the discharge MOS cell 120 is problematic in the bypass circuit 100.
Example III
The embodiment of the present invention provides a battery management system, which includes a detection circuit for detecting a MOS state in the foregoing embodiment, and various modifications and specific embodiments in the foregoing embodiment are equally applicable to a battery management system in this embodiment, and by the foregoing detailed description of the detection circuit for detecting a MOS state, a person skilled in the art can clearly know a method for implementing a battery management system in this embodiment, so that, for brevity of description, it will not be described in detail here.
In summary, the embodiment of the present invention locates, by adding the current detection unit 130 to the branch circuit 100, to which of the charging MOS unit 110 and the discharging MOS unit 120 of the branch circuit 100 is in the off state, and after locking the off branch circuit 100, controls the charging MOS unit 110 or the discharging MOS unit 120 on the branch circuit 100 to be turned off through the main control unit 200, and finally locks, according to the voltage change before and after the off, whether the charging MOS unit 110 is in the off state or the discharging MOS unit 120 is in the off state, so as to detect which of the specific MOS units is damaged when the MOS units are in the parallel state.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims and the equivalents thereof, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A MOS state detection circuit, comprising: the charging MOS unit is connected with the discharging MOS unit, the current detection unit is connected to the rear of the charging MOS unit and the discharging MOS unit, the charging MOS unit, the discharging MOS unit and the current detection unit are all connected with the main control unit, wherein the main control unit is used for collecting voltage information at two ends of the current detection unit to judge whether current flows through the branch circuit or not, and controlling on-off of the charging MOS unit and the discharging MOS unit.
2. A MOS state detection circuit according to claim 1, wherein the current detection unit employs a shunt resistor.
3. A MOS state detection circuit according to claim 1, wherein the plurality of branch circuits are connected in parallel with each other.
4. The MOS state detection circuit of claim 1, further comprising a power supply module, wherein the power supply module is connected to the charge MOS unit, wherein the charge MOS unit is connected to the discharge MOS unit, and wherein the discharge MOS unit is connected to the current detection unit.
5. A method for detecting a MOS state, applied to a MOS state detection circuit according to any one of claims 1 to 4, the method comprising:
the main control unit collects voltage information at two ends of the current detection unit to judge whether current flows through the branch circuit or not;
when the current detection unit detected by the main control unit has no voltage, the branch circuit has no current, and the charging MOS unit or the discharging MOS unit is disconnected;
the main control unit controls the on-off of the charging MOS unit and the discharging MOS unit, and judges whether the charging MOS unit is damaged or the discharging MOS unit is damaged according to the voltage change.
6. The method for detecting a MOS state according to claim 5, wherein the main control unit controls on/off of the charge MOS unit and the discharge MOS unit, and judges whether the charge MOS unit is damaged or the discharge MOS unit is damaged according to a voltage change, specifically comprising:
the charging MOS units are controlled to be disconnected once through the main control unit, and whether the charging MOS units are damaged or not is judged specifically according to the voltage change among the charging MOS units.
7. The method according to claim 6, wherein the step of determining whether the charging MOS unit is damaged or damaged according to a voltage change between the charging MOS units by controlling the charging MOS unit to be turned off once by the main control unit, comprises:
the voltage at two ends of the charging MOS unit is V1 and V2 respectively, and after the main control unit controls the charging MOS unit to be disconnected, if V1-V2 = 0, the branch circuit is judged to be disconnected for the charging MOS unit;
if V1-v2=full package voltage, then the bypass circuit is judged to be open for the discharge MOS cell.
8. The method for detecting a MOS state according to claim 5, wherein the main control unit controls on/off of the charge MOS unit and the discharge MOS unit, and judges whether the charge MOS unit is damaged or the discharge MOS unit is damaged according to a voltage change, specifically comprising:
the main control unit controls the discharge MOS units to be disconnected once, and whether the charging MOS units are damaged or not is judged according to the voltage change among the discharge MOS units.
9. The method according to claim 8, wherein the step of determining whether the charging MOS unit is damaged or damaged according to a voltage change between the discharging MOS units by controlling the discharging MOS units to be turned off once by the main control unit, comprises:
the voltage at two ends of the discharging MOS unit is V2 and V3 respectively, and after the main control unit controls the discharging MOS unit to be disconnected, if V2-V3 = 0, the branch circuit is judged to be disconnected as the charging MOS;
if V2-v3=full packet voltage, then the bypass circuit is judged to be open for discharging MOS.
10. A battery management system comprising a MOS state detection circuit as claimed in any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311650769.3A CN117647716A (en) | 2023-12-04 | 2023-12-04 | MOS state detection circuit, method and battery management system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311650769.3A CN117647716A (en) | 2023-12-04 | 2023-12-04 | MOS state detection circuit, method and battery management system |
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| Publication Number | Publication Date |
|---|---|
| CN117647716A true CN117647716A (en) | 2024-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311650769.3A Pending CN117647716A (en) | 2023-12-04 | 2023-12-04 | MOS state detection circuit, method and battery management system |
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| CN (1) | CN117647716A (en) |
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- 2023-12-04 CN CN202311650769.3A patent/CN117647716A/en active Pending
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