CN117728050A - Battery management system and method - Google Patents
Battery management system and method Download PDFInfo
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- CN117728050A CN117728050A CN202311701454.7A CN202311701454A CN117728050A CN 117728050 A CN117728050 A CN 117728050A CN 202311701454 A CN202311701454 A CN 202311701454A CN 117728050 A CN117728050 A CN 117728050A
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- 238000001514 detection method Methods 0.000 claims abstract description 12
- 238000007726 management method Methods 0.000 claims description 33
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Abstract
The invention discloses a battery management system and a method, wherein a control module, a first voltage dividing module and a second voltage dividing module; the negative relay, the first voltage dividing module, the second voltage dividing module and the control module are sequentially and electrically connected to form a loop, and the detection end of the control module is electrically connected with a connecting node between the first voltage dividing module and the second voltage dividing module; the control module is used for outputting a voltage signal, detecting the voltage at the connecting node and determining whether the negative relay is adhered or not according to the voltage signal and the voltage at the connecting node. The embodiment of the invention can reduce the cost and the complexity of logic control.
Description
Technical Field
The embodiment of the invention relates to the technical field of battery management, in particular to a battery management system and method.
Background
The negative relay of the battery management system (Battery Management System, BMS) is typically required to detect sticking before closing.
The negative pole relay adhesion detection of BMS among the prior art, most use the mode of gathering total pressure to judge whether adhesion, however negative pole relay detects total pressure, mostly need increase resistance at negative pole relay both ends, and need the line closed positive pole relay just can detect negative pole relay, and the cost is higher like this to control logic is comparatively complicated.
Disclosure of Invention
The invention discloses a battery management system and a method, which can reduce the cost and the complexity of logic control.
In a first aspect, an embodiment of the present invention provides a battery management system, including: the device comprises a control module, a first voltage dividing module and a second voltage dividing module;
the negative relay, the first voltage dividing module, the second voltage dividing module and the control module are sequentially and electrically connected to form a loop, and the detection end of the control module is electrically connected with a connecting node between the first voltage dividing module and the second voltage dividing module;
the control module is used for outputting a voltage signal, detecting the voltage at the connecting node and determining whether the negative relay is adhered or not according to the voltage signal and the voltage at the connecting node.
Optionally, the control module is used for inputting a voltage signal with a set size to the second voltage dividing module and/or inputting a voltage signal with a set size to the negative relay, so that the two ends of the control module have a set pressure difference, and the negative adhesion voltage range is determined according to the set pressure difference;
the control module is further used for continuously collecting second voltage at the connecting node when the first voltage at the connecting node collected for n times is in the negative electrode adhesion voltage range, and determining whether the negative electrode relay is adhered according to the second voltage and the first voltage; wherein n is an integer greater than or equal to 2.
Optionally, the control module is used for comparing the second voltage collected each time with the first voltage collected for the first time, and determining whether the negative relay is adhered according to the comparison result.
Optionally, the control module is configured to determine that the negative relay is stuck when absolute values of differences between the second voltage acquired for m consecutive times and the first voltage acquired for the first time are all within a set difference range, where m is an integer greater than or equal to 2.
Optionally, the control module is configured to start collecting the voltage at the connection node after waiting for a preset period after outputting the voltage signal.
In a second aspect, an embodiment of the present invention provides a battery management method, which is implemented by using the battery management system provided in any embodiment of the present invention, where the battery management method includes:
the control module outputs a voltage signal, detects the voltage at the connecting node, and determines whether the negative relay is adhered according to the voltage and the voltage at the connecting node.
Optionally, the control module outputs a voltage signal, detects a voltage at the connection node, determines whether the negative relay is stuck according to the voltage and the voltage at the connection node, and includes:
the control module inputs a voltage signal with a set size to the second voltage dividing module and/or inputs a voltage signal with a set size to the negative relay, so that the two ends of the control module have set pressure differences, and the negative adhesion voltage range is determined according to the set pressure differences;
when the first voltage at the connecting node which is continuously collected for n times is in the negative electrode adhesion voltage range, the control module continuously collects the second voltage at the connecting node, and whether the negative electrode relay is adhered or not is determined according to the second voltage and the first voltage; wherein n is an integer greater than or equal to 2.
Optionally, determining whether the negative relay is stuck according to the second voltage and the first voltage includes:
the control module compares the second voltage collected each time with the first voltage collected for the first time, and determines whether the negative relay is adhered or not according to a comparison result.
Optionally, the control module compares the second voltage collected each time with the first voltage collected for the first time, determines whether the negative relay is adhered according to a comparison result, and includes:
and the control module determines that the negative relay is adhered when absolute values of differences between the second voltage acquired for m times continuously and the first voltage acquired for the first time are all within a set difference range, wherein m is an integer greater than or equal to 2.
Optionally, the control module outputs a voltage signal and detecting the voltage at the connection node includes: after the control module outputs the voltage signal, the voltage at the connecting node is collected after waiting for a preset time.
The battery management system provided by the embodiment of the invention comprises: the device comprises a control module, a first voltage dividing module and a second voltage dividing module. The negative relay, the first voltage dividing module, the second voltage dividing module and the control module are sequentially and electrically connected to form a loop, and the detection end of the control module is electrically connected with a connection node between the first voltage dividing module and the second voltage dividing module. The control module is used for outputting a voltage signal, detecting the voltage at the connecting node and determining whether the negative relay is adhered or not according to the voltage signal and the voltage at the connecting node. The control module is used for inputting a voltage signal with a set size to the second voltage dividing module through the first power end and/or inputting a voltage signal with a set size to the negative electrode relay through the second power end, so that a set pressure difference exists between the second end of the first voltage dividing module and the second end of the negative electrode relay, detecting the voltage of the second end of the first voltage dividing module, and determining whether the negative electrode relay is adhered or not according to the set pressure difference and the voltage of the second end of the first voltage dividing module. According to the embodiment of the invention, the adhesion detection of the negative electrode relay can be realized through the control module and the two voltage dividing modules, the cost can be reduced, the hardware cost is reduced, the adhesion judgment can be performed only by outputting the electrical signal with the set size through the control module and detecting the voltage between the two voltage dividing modules, and the complexity of logic control is effectively reduced.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, 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 invention, 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 according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of yet another battery management system according to an embodiment of the present invention;
fig. 3 is a flowchart of a battery management method according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention 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 invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention 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 invention 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 battery management system according to an embodiment of the present invention, referring to fig. 1, the battery management system includes: a control module 1, a first voltage dividing module 3 and a second voltage dividing module 2. The negative relay 4, the first voltage division module 3, the second voltage division module 2 and the control module 1 are sequentially and electrically connected to form a loop, and a detection end of the control module 1 is electrically connected with a connection node between the first voltage division module 3 and the second voltage division module 2. The control module 1 is used for outputting a voltage signal, detecting the voltage of the connecting node 5, and determining whether the negative relay 4 is stuck or not according to the voltage signal and the voltage of the connecting node 5.
Wherein the first sub-module 3 comprises a first resistor 31 and the second sub-module comprises a second resistor 21.
In particular, the control module 1 may comprise a VCU. When the control module 1 inputs a voltage signal with a set magnitude to the second voltage dividing module 2 through the first power supply end, the second end of the negative electrode relay 4 can be grounded through the second power supply end, and when the control module 1 is used for inputting a voltage signal with a set magnitude to the negative electrode relay 4 through the second power supply end, the second end of the second voltage dividing module 2 can be grounded through the first power supply end. The set pressure difference between the second end of the second voltage dividing module 3 and the second end of the negative electrode relay 4 may be 5V or the like, and the embodiment is not particularly limited.
When the negative relay 4 is turned off, the control module 1 inputs a voltage signal of a set magnitude to the second voltage dividing module 2 or the negative relay 4, detects the voltage at the connection node 5 between the first voltage dividing module 3 and the second voltage dividing module 2, and the voltage at the connection node 5 between the first voltage dividing module 3 and the second voltage dividing module 2 should be the voltage output from the control module 1 to the second voltage dividing module 2. When the negative electrode relay 4 is closed, the control module 1 inputs a voltage signal of a set magnitude to the second voltage dividing module 2 or the negative electrode relay 4, detects the voltage at the connection node 5 between the first voltage dividing module 3 and the second voltage dividing module 2, and divides the voltage at the detected connection node 5 through the second voltage dividing module 2 and the first voltage dividing module 3 at this time, the detected voltage should be smaller than a set value of a set voltage difference, which is determined according to the set voltage difference, the resistance values of the first voltage dividing module 3 and the second voltage dividing module 2, and the set value may be 2.6V when the exemplary set voltage difference is 5V.
If the detected voltage at the connection node 5 is the same as the set voltage difference detected when the negative relay 4 is closed when the negative relay 4 is opened, the negative relay 4 is stuck, and if the detected voltage at the connection node 5 is equal to the voltage output by the control module 1 to the second voltage dividing module 2 when the negative relay 4 is opened, the negative relay 4 is not stuck. For example, when the negative electrode relay 4 is turned off, the control module 1 inputs a voltage signal with a set magnitude to the second voltage dividing module 2, and the set voltage difference between the second end of the second voltage dividing module 2 and the second end of the negative electrode relay 4 is a, at this time, the second end of the first voltage dividing module 3 detects that the voltage is the voltage a output by the control module 1 because the circuit cannot form a loop. When the negative relay 4 is closed, the circuit forms a loop, and the detected voltage at the second end of the first voltage dividing module 3 is a-b, assuming that the voltage divided by the second voltage dividing module 2 is b. Therefore, if the detected second terminal voltage of the first voltage dividing module 3 is a-b when the negative electrode relay 4 is turned off, it can be determined that the negative electrode relay 4 is stuck.
The battery management system provided by the embodiment of the invention comprises: a control module 1, a first voltage dividing module 3 and a second voltage dividing module 2. The negative relay 4, the first voltage division module 3, the second voltage division module 2 and the control module 1 are sequentially and electrically connected to form a loop, and a detection end of the control module 1 is electrically connected with a connection node between the first voltage division module 3 and the second voltage division module 2. The control module 1 is used for outputting a voltage signal, detecting the voltage of the connecting node 5, and determining whether the negative relay 4 is stuck or not according to the voltage signal and the voltage of the connecting node 5. The control module 1 is configured to input a voltage signal of a set magnitude to the second voltage dividing module 2 through the first power supply terminal and/or input a voltage signal of a set magnitude to the negative electrode relay through the second power supply terminal, so that a set pressure difference exists between the second terminal of the first voltage dividing module 3 and the second terminal of the negative electrode relay 4, detect the voltage of the second terminal of the first voltage dividing module 2, and determine whether the negative electrode relay 4 is adhered according to the set pressure difference and the voltage of the second terminal of the first voltage dividing module 3. According to the embodiment of the invention, the adhesion detection of the negative electrode relay 4 can be realized through the control module 1 and the two voltage dividing modules, the cost can be reduced, the hardware cost is reduced, the adhesion judgment can be carried out only by outputting an electric signal with a set size through the control module 1 and detecting the voltage between the two voltage dividing modules, and the complexity of logic control is effectively reduced.
With continued reference to fig. 1, on the basis of the above embodiment, optionally, the control module 1 is configured to input a voltage signal with a set magnitude to the second voltage dividing module 2 and/or input a voltage signal with a set magnitude to the negative electrode relay 4, so that two ends of the control module 1 have a set differential pressure, and determine a negative electrode adhesion voltage range according to the set differential pressure. The control module 1 is further used for continuously collecting second voltage of the connection node 5 when the first voltage of the connection node 5 collected for n times is within the negative electrode adhesion voltage range, and determining whether the negative electrode relay 4 is adhered according to the second voltage and the first voltage; wherein n is an integer greater than or equal to 2.
Wherein the voltage signal of the set magnitude is a voltage signal of 5V. n is an integer greater than or equal to 2. The negative electrode blocking voltage can range from 2.4V to 2.85V. When the negative relay 4 is closed, if the detected first voltage at the second end of the first voltage division module 3 is not in the negative adhesion voltage range, the negative relay 4 is not adhered, if the detected first voltage at the second end of the first voltage division module 3 is in the negative adhesion voltage range, the negative relay 4 may be truly adhered, and voltage fluctuation may be generated due to voltage serial in a circuit, so that the detected first voltage at the second end of the first voltage division module 3 is in the negative adhesion voltage range. At this time, the first voltage of the second end of the first voltage dividing module 3 is continuously collected for n-1 times, if the first voltages of the second ends of the first voltage dividing modules 3 are all in the negative adhesion voltage range, the second voltages of the second ends of the first voltage dividing modules 3 are continuously collected, the second voltages of the second ends of the first voltage dividing modules 3 are collected and compared with the first voltages of the second ends of the first voltage dividing modules 3 collected for the first time, and whether the negative relay 4 is adhered is determined according to the comparison result. Through the mode, the detection result can be influenced by the voltage which is connected in series in the circuit.
With continued reference to fig. 1, based on the foregoing embodiment, optionally, the control module 1 is configured to compare the second voltage collected each time with the first voltage collected for the first time, and determine whether the negative relay 4 is stuck according to a comparison result.
Specifically, because if the negative relay 4 is stuck, the control module 1 collects the second voltage of the second end of the first voltage dividing module 3 every time, the second voltage is very stable. The control module 1 can determine whether the negative relay 4 is adhered or not by comparing the second voltage of the second end of the first voltage dividing module 3 collected each time with the first voltage of the second end of the first voltage dividing module 3 collected for the first time, and further improves the detection accuracy by comparing the second power supply collected each time with the first voltage collected for the first time.
With continued reference to fig. 1, on the basis of the above embodiment, optionally, the control module 1 is configured to determine that the negative relay 4 is stuck when the absolute values of the differences between the second voltage acquired m consecutive times and the first voltage acquired for the first time are within the set difference range.
Wherein m is an integer greater than or equal to 2. The difference range is set to be less than or equal to 15mv.
Specifically, the absolute value of the difference between the second voltage at the second end of the first voltage dividing module 3 collected by the control module 1 for m times and the first voltage at the second end of the first voltage dividing module 3 collected by the first time is within the set difference range, so that the negative relay 4 is proved to be truly stuck, and if any one or several times of the second voltage at the second end of the first voltage dividing module 3 collected by the control module for m times and the absolute value of the difference between the second voltage at the second end of the first voltage dividing module 3 collected by the first time are not within the set difference range, the negative relay 4 is proved to be not stuck (namely, false alarm stuck caused by the voltage series-in circuit).
According to the technical scheme provided by the embodiment, the control module 1 determines the negative electrode adhesion voltage range according to the set differential pressure, when the first voltages of the second ends of the first voltage division modules collected for n times continuously are all in the negative electrode adhesion voltage range, the second voltages of the second ends of the first voltage division modules collected for each time are continuously collected, whether the negative electrode relay is adhered is determined according to the second voltages of the second ends of the first voltage division modules 3 collected for each time and the first voltages of the second ends of the first voltage division modules 3 collected for the first time, if the absolute values of the differences of the second voltages of the second ends of the first voltage division modules 3 collected for each time and the first voltages of the second ends of the first voltage division modules 3 collected for each time are all in the set differential value range, the negative electrode relay 4 is proved to be truly adhered, and if the absolute values of the differences of the second voltages of the second ends of the first voltage division modules 3 collected for each time and the first voltages of the second ends of the first voltage division modules 3 collected for each time are not in the set differential value range, the negative electrode relay 4 is proved to be not adhered. The embodiment of the invention can detect the adhesion of the negative relay 4 for multiple times, and can filter the voltage of the circuit serial in, so that the negative relay 4 can report the correct state, and the false alarm risk is reduced.
With continued reference to fig. 1, the control module 1 is optionally configured to start to collect the voltage at the connection node 5 after waiting for a preset period after outputting the voltage signal, based on the above embodiments.
Wherein the preset time period is greater than or equal to 250ms.
Specifically, after the control module inputs a voltage signal with a set size to the second voltage division module 2 and/or the negative electrode relay, the first voltage at the second end of the first voltage division module 3 starts to be collected after the voltage variation state of the negative electrode relay at the previous stage is filtered after the preset time is waited for by initializing.
In the embodiment of the invention, after the control module 1 inputs the voltage signal with the set size to the second voltage dividing module 2 through the first power end and/or inputs the voltage signal with the set size to the negative electrode relay 4 through the second power end, the first voltage of the second end of the first voltage dividing module 3 starts to be collected after waiting for the preset time length, so that the first voltage can reflect the actual voltage of the second end of the current first voltage dividing module 3, false alarm adhesion of the negative electrode relay 4 is avoided, and the false alarm risk is reduced and the driving safety is improved.
The battery management method provided by the embodiment of the invention is implemented by adopting the battery management system provided by any embodiment of the invention, and comprises the following steps: the control module 1 outputs a voltage signal, detects the voltage at the connection node 5, and determines whether the negative relay 4 is stuck or not according to the voltage and the voltage at the connection node 5.
In the embodiment of the invention, the control module is used for outputting a voltage signal, detecting the voltage at the connecting node and determining whether the negative relay is adhered or not according to the voltage signal and the voltage at the connecting node. The control module is used for inputting a voltage signal with a set size to the second voltage dividing module through the first power end and/or inputting a voltage signal with a set size to the negative electrode relay through the second power end, so that a set pressure difference exists between the second end of the first voltage dividing module and the second end of the negative electrode relay, detecting the voltage of the second end of the first voltage dividing module, and determining whether the negative electrode relay is adhered or not according to the set pressure difference and the voltage of the second end of the first voltage dividing module.
According to the embodiment of the invention, the adhesion detection of the negative electrode relay can be realized through the control module and the two voltage dividing modules, the cost can be reduced, the hardware cost is reduced, the adhesion judgment can be performed only by outputting the electrical signal with the set size through the control module and detecting the voltage between the two voltage dividing modules, and the complexity of logic control is effectively reduced.
On the basis of the above embodiment, optionally, the control module outputs a voltage signal, detects a voltage at the connection node, determines whether the negative relay is stuck according to the voltage and the voltage at the connection node, and includes: the control module inputs a voltage signal with a set size to the second voltage dividing module and/or inputs a voltage signal with a set size to the negative relay, so that the two ends of the control module have set pressure differences, and the negative adhesion voltage range is determined according to the set pressure differences; when the first voltage at the connecting node which is continuously collected for n times is in the negative electrode adhesion voltage range, the control module continuously collects the second voltage at the connecting node, and whether the negative electrode relay is adhered or not is determined according to the second voltage and the first voltage; wherein n is an integer greater than or equal to 2.
On the basis of the above embodiment, optionally, determining whether the negative relay is stuck according to the second voltage and the first voltage includes: the control module compares the second voltage collected each time with the first voltage collected for the first time, and determines whether the negative relay is adhered or not according to a comparison result.
On the basis of the above embodiment, optionally, the control module compares the second voltage collected each time with the first voltage collected for the first time, and determines whether the negative relay is adhered according to a comparison result, including: and the control module determines that the negative relay is adhered when absolute values of differences between the second voltage acquired for m times continuously and the first voltage acquired for the first time are all within a set difference range, wherein m is an integer greater than or equal to 2.
Based on the above embodiment, optionally, the control module outputs a voltage signal, and detecting the voltage at the connection node includes: after the control module outputs the voltage signal, the voltage at the connecting node is collected after waiting for a preset time.
The battery management method of the embodiment of the invention belongs to the same inventive concept as the battery management system provided by any embodiment of the invention, has corresponding beneficial effects, and is not detailed in the technical details of the embodiment, and the battery management system provided by any embodiment of the invention is detailed.
Fig. 2 is a schematic structural diagram of yet another battery management system according to an embodiment of the present invention. Fig. 3 is a flowchart of a battery management method according to an embodiment of the present invention, and referring to fig. 2 and 3, the battery management system further includes a positive relay 7, a motor 6, and a battery 8. Illustratively, when the negative relay 1 is closed, the initialization first filters 250ms, filters out the varying state of the previous stage relay, and waits for the signal and voltage to stabilize. After 250ms of initialization, the counter N is set to 0, the voltage U at the second end of the first voltage division module 3 is read at this time, the timer value T is set to 0, then, whether the voltage U at the second end of the first voltage division module 3 is in the negative adhesion voltage range is judged, if the voltage U at the second end of the first voltage division module 3 is not in the negative adhesion voltage range, the negative relay 1 is proved to be non-adhesion, if the voltage U at the second end of the first voltage division module 3 is in the negative adhesion voltage range, whether the timer T is larger than 200ms is judged, if the timer T is smaller than or equal to 200ms, the voltage at the second end of the first voltage division module 3 is judged again, if the timer T is larger than 200ms, because the calling period is 10ms, the voltage at the second end of the first voltage division module 3 is detected 20 times, if the voltage U at the second end of the first voltage division module 3 is detected to be within the negative adhesion voltage range for 20 times, the voltage U1 at the second end of the first voltage division module 3 for 21 times is read, the absolute value of the difference between the voltage U at the second end of the first voltage division module 3 read for the first time and the voltage U1 at the second end of the first voltage division module 3 for 21 times is compared with the set difference value, if the absolute value of the difference between the voltage U at the second end of the first voltage division module 3 read for the first time and the voltage U1 at the second end of the first voltage division module 3 for 21 times is greater than the set difference value, the negative relay 1 is not adhered, if the absolute value of the difference between the voltage U at the second end of the first voltage division module 3 read for the first time and the voltage U1 at the second end of the first voltage division module 3 for 21 times is less than or equal to the set difference value, the negative relay 1 may be adhered, it is necessary to continue to determine whether the counter N is greater than 2, if N is larger than 2, the negative relay 1 is proved to be truly stuck, and the BMS gives an alarm to not allow high voltage on the whole vehicle. If N is smaller than 2, N is self-added, and the negative relay 1 is run again to adhere the judgment logic.
The technical method provided by the embodiment of the invention detects the adhesion of the negative relay by using a mode of injecting 5V, thereby not only effectively reducing the cost and the complexity of logic control, but also filtering the voltage of the circuit serial-in so as to enable the negative relay to report the correct state and reduce the false alarm risk.
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 invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. 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 invention should be included in the scope of the present invention.
Claims (10)
1. A battery management system, comprising:
the device comprises a control module, a first voltage dividing module and a second voltage dividing module;
the negative relay, the first voltage dividing module, the second voltage dividing module and the control module are sequentially and electrically connected to form a loop, and the detection end of the control module is electrically connected with a connection node between the first voltage dividing module and the second voltage dividing module;
the control module is used for outputting a voltage signal, detecting the voltage at the connecting node and determining whether the negative relay is adhered or not according to the voltage signal and the voltage at the connecting node.
2. The battery management system according to claim 1, wherein:
the control module is used for inputting a voltage signal with a set size to the second voltage dividing module and/or inputting a voltage signal with a set size to the negative relay, so that two ends of the control module have set pressure differences, and determining a negative adhesion voltage range according to the set pressure differences;
the control module is further used for continuously collecting second voltage at the connecting node when the first voltage at the connecting node collected for n times is within the negative electrode adhesion voltage range, and determining whether the negative electrode relay is adhered or not according to the second voltage and the first voltage; wherein n is an integer greater than or equal to 2.
3. The battery management system according to claim 2, wherein:
the control module is used for comparing the second voltage collected each time with the first voltage collected for the first time, and determining whether the negative relay is adhered or not according to a comparison result.
4. A battery management system according to claim 3, wherein:
the control module is used for determining that the negative relay is adhered when absolute values of differences between the second voltage acquired for m times continuously and the first voltage acquired for the first time are all within a set difference range, wherein m is an integer greater than or equal to 2.
5. The battery management system according to claim 1, wherein:
and the control module is used for starting to collect the voltage at the connecting node after waiting for a preset time after outputting the voltage signal.
6. A battery management method, performed using the battery management system of any one of claims 1-5, the battery management method comprising:
the control module outputs a voltage signal, detects the voltage at the connecting node, and determines whether the negative relay is adhered or not according to the voltage and the voltage at the connecting node.
7. The method of claim 6, wherein the control module outputting a voltage signal and detecting a voltage at the connection node, determining whether the negative relay is stuck based on the voltage and the voltage at the connection node, comprising:
the control module inputs a voltage signal with a set size to the second voltage dividing module and/or inputs a voltage signal with a set size to the negative relay, so that two ends of the control module have set pressure differences, and a negative adhesion voltage range is determined according to the set pressure differences;
when the first voltage at the connecting node collected for n times continuously is within the negative electrode adhesion voltage range, the control module continuously collects the second voltage at the connecting node, and determines whether the negative electrode relay is adhered or not according to the second voltage and the first voltage; wherein n is an integer greater than or equal to 2.
8. The method of claim 7, wherein determining whether the negative relay is stuck based on the second voltage and the first voltage comprises:
the control module compares the second voltage collected each time with the first voltage collected for the first time, and determines whether the negative relay is adhered or not according to a comparison result.
9. The method of claim 8, wherein the control module comparing the second voltage of each acquisition with the first voltage of a first acquisition, and determining whether the negative relay is stuck based on the comparison result comprises:
and the control module determines that the negative relay is adhered when absolute values of differences between the second voltage acquired for m times and the first voltage acquired for the first time are all within a set difference range, wherein m is an integer greater than or equal to 2.
10. The method of claim 6, wherein the control module outputting a voltage signal and detecting a voltage at the connection node comprises:
and after the control module outputs the voltage signal, the voltage at the connecting node starts to be collected after waiting for a preset time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311701454.7A CN117728050A (en) | 2023-12-11 | 2023-12-11 | Battery management system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311701454.7A CN117728050A (en) | 2023-12-11 | 2023-12-11 | Battery management system and method |
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| CN117728050A true CN117728050A (en) | 2024-03-19 |
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| CN202311701454.7A Pending CN117728050A (en) | 2023-12-11 | 2023-12-11 | Battery management system and method |
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| CN (1) | CN117728050A (en) |
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2023
- 2023-12-11 CN CN202311701454.7A patent/CN117728050A/en active Pending
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