CN115275386A - Storage battery pack fault management system - Google Patents
Storage battery pack fault management system Download PDFInfo
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- CN115275386A CN115275386A CN202210721770.XA CN202210721770A CN115275386A CN 115275386 A CN115275386 A CN 115275386A CN 202210721770 A CN202210721770 A CN 202210721770A CN 115275386 A CN115275386 A CN 115275386A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a storage battery pack fault management system, which comprises: the resistance shunt module is used for monitoring the line condition of the storage battery pack; the acquisition module is used for acquiring the voltage of the storage battery pack monomer to obtain a monitoring signal; the conversion module is used for converting the monitoring signals into monitoring data and transmitting the monitoring data to the processing module; the processing module is used for processing the monitoring data to obtain the weighted sum and the average voltage deviation value of the storage battery monomer; the early warning module is used for comparing the weighted sum and the average voltage deviation value with corresponding preset threshold values to generate early warning signals; and the control module is used for controlling the storage battery pack to normally operate By configuring a By-pass bypass. According to the invention, by configuring the By-pass, when any single body of the storage battery pack is short-circuited or fails to influence the work of the storage battery pack, the corresponding By-pass is started to complete the elimination of the series group where the failed single body is located, so that the reliability of the storage battery pack system is obviously improved.
Description
Technical Field
The invention belongs to the field of storage battery pack management, and particularly relates to a storage battery pack fault management system.
Background
The storage battery is usually used in a form of a battery pack, and management and monitoring of the storage battery pack mainly solve the problem of fault detection of the storage battery pack. The fault detection of the storage battery pack mainly detects the abnormal capacity attenuation of one or more storage batteries in the storage battery pack, and influences the normal use condition of the whole storage battery pack.
In the prior art, fault detection of a storage battery pack is generally realized by externally hanging a storage battery pack fault detector, and the storage battery pack fault detector must detect information of each single storage battery in the storage battery pack to judge whether the storage battery pack fails, and judging whether the single storage battery fails is generally performed by monitoring internal resistance change of the storage battery. Such detection methods have two main drawbacks: one is that the correlation between the internal resistance of the storage battery and the capacity of the storage battery is generally considered to be not more than 80%, so that the accuracy of the storage battery is limited; secondly, the hardware cost for accurately testing the internal resistance of the storage battery is quite high.
Disclosure of Invention
The invention aims to provide a storage battery pack fault management system to solve the problems in the prior art.
In order to achieve the above object, the present invention provides a storage battery pack fault management system, including:
the resistance shunt module is used for monitoring the line condition of the storage battery pack;
the acquisition module is connected with the resistance shunt module and used for acquiring the voltage of the storage battery pack monomer to obtain a monitoring signal;
the conversion module is connected with the acquisition module and used for converting the monitoring signals into monitoring data and transmitting the monitoring data to the processing module;
the processing module is connected with the conversion module and used for processing the monitoring data to obtain the weighted sum and the average voltage deviation value of the storage battery monomer;
the early warning module is connected with the processing module and used for comparing the weighted sum and the average voltage deviation value with corresponding preset threshold values to generate early warning signals;
and the control module is connected with the early warning module and used for controlling the normal operation of the storage battery pack By configuring a By-pass bypass.
Preferably, the resistance shunt module includes: a shunt switch unit and a drive switch unit; the shunt switch unit is used for preventing short circuit caused by resistor shunt; and the driving switch unit is used for monitoring the line condition of the corresponding storage battery monomer after one switch has a short-circuit fault.
Preferably, the conversion module includes:
the sensing unit is used for transmitting a monitoring signal of the storage battery pack monomer to the signal conditioning unit, wherein the monitoring signal is a bipolar analog signal;
the signal conditioning unit is used for converting the bipolar analog signal into a unipolar analog signal;
and the digital conversion unit is used for converting the unipolar analog signals into monitoring data and transmitting the monitoring data to the processing module.
Preferably, the signal conditioning unit includes a low-pass filtering unit, a precise absolute value unit, and a precise amplifying unit, wherein:
the low-pass filtering unit is used for filtering high-frequency interference in the bipolar analog signal to obtain a target bipolar analog signal;
the precise absolute value unit is used for converting the target bipolar analog signal into a unipolar analog signal;
the precise amplifying unit is used for amplifying the unipolar analog signals and transmitting the unipolar analog signals to the digital conversion unit.
Preferably, the processing module includes:
the voltage processing unit is used for obtaining voltage change data of the storage battery pack monomer in each time period according to the monitoring data;
the weighting processing unit is used for weighting the difference value between the voltage change data of the storage battery pack monomer in each time period and the voltage change minimum value in the corresponding time period to obtain a weighted sum;
and the voltage difference unit is used for obtaining the difference between the single voltage of each storage battery pack and the average voltage in a fixed time period according to the monitoring data and obtaining the average voltage deviation value.
Preferably, the early warning module includes:
the judging unit is used for comparing the weighted sum and the average voltage deviation value with corresponding preset thresholds, and if the weighted sum and the average voltage deviation value exceed the corresponding preset thresholds, an early warning signal is sent out;
and the communication unit is used for acquiring the position information of the target fault storage battery pack monomer according to the early warning signal through a communication network and generating a processing signal.
Preferably, the control module comprises:
the fault-tolerant unit is used for receiving the processing signal By configuring a By-pass for the storage battery pack monomer, starting the By-pass corresponding to the target fault storage battery pack monomer, removing the target fault storage battery pack monomer and generating an operation signal;
and the control unit is used for controlling the normal operation of the new storage battery pack based on the received operation signal.
The invention has the technical effects that:
the invention judges the degree of the battery performance by comprehensively considering the weighted sum and the average voltage deviation value of the single storage battery pack, thereby improving the detection accuracy of the storage battery pack; the larger the weighted sum is, the larger the average voltage deviation value is, the worse the battery performance is when the voltage is changed into the diagnosis standard, and an early warning signal is generated by comparing the battery performance with a preset threshold value; by configuring the By-pass, when any single body of the storage battery pack is short-circuited or fails to affect the work of the storage battery pack, the corresponding By-pass is started to complete the elimination of the series group in which the failed single body is positioned, ensure that the functional performance of the rest storage battery pack meets the requirements, and remarkably improve the reliability and safety of the storage battery pack system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
fig. 1 is a schematic diagram of a system structure in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
Example one
This embodiment employs a distributed battery monitoring and management architecture. The battery pack management system is used for carrying out modular management on a group of batteries, and divides the whole battery pack into a plurality of single detection modules, wherein generally 8 single batteries can be taken as one detection module. The modules are interconnected by using a bus, so that the synchronous measurement of parameters such as the voltage, the current and the like of the battery is ensured. Moreover, the whole system can be distributed, and the number of modules can be flexibly changed according to the number of the batteries.
As shown in fig. 1, the present embodiment provides a battery pack fault management system, including:
the resistance shunt module is used for monitoring the line condition of the storage battery pack;
preferably, the resistance shunt module includes: a shunt switch unit and a drive switch unit; the shunt switch unit comprises a first transistor and a second transistor and is used for preventing short circuit caused by resistor shunt; the driving switch unit comprises a first transistor and a second transistor and is used for ensuring that the short circuit condition does not occur in the corresponding storage battery monomer after one switch has the short circuit fault.
A traditional resistor shunt mode is adopted in a shunt circuit of the storage battery pack, a shunt switch and a driving switch are realized by traditional bipolar transistors, and the shunt switch selects two transistors Q4-1 and Q5-1 to be connected in series with transistors Q1-1 and Q2-1, so that short-circuit faults of the shunt switch can be prevented. Each module contains 24 shunt currents and the shunt switches and drive switches are implemented using conventional bipolar transistors. Fig. 1 shows a schematic diagram of an equalizing shunt circuit of a single battery, and a shunt switch selects two transistors to be connected in series, so that short-circuit faults of the shunt switch can be prevented; the shunt resistors are connected in parallel by adopting 200 omega/1W resistors, the maximum shunt current is 50mA, the shunt power corresponding to each monomer is 0.168W, and the derating coefficient of the shunt resistor is as follows: 8.4 percent, and meets the first-level derating requirement. The balance control switches of all the single batteries adopt a series connection type double-switch design, and the balance function can be still realized after one switch tube has a short-circuit fault, so that the safety and the reliability of the lithium ion storage battery under the condition of the balance fault are ensured.
The specific implementation measures are as follows: each single equalization switch realizes equalization independent control through two strings, and meanwhile, the two strings of switch tubes are controlled by the same driving control signal, so that the short circuit of the corresponding storage battery single body can be avoided under the condition that one switch has a fault and is short-circuited. The storage battery pack is connected with the winding series equalization switch in series by adopting a mode of connecting two transistors in series, and independent driving control signals are respectively adopted for controlling, so that the condition that the corresponding storage battery monomer is not disconnected under the condition that one switch is in short circuit fault can be ensured. In order to further improve the reliability, fuses are considered to be connected in series in the switch circuit corresponding to the storage battery pack and the switch circuit corresponding to each storage battery monomer, and if two FM087A fuses are selected to be connected in parallel, the storage battery short circuit condition can not occur under the condition that the two series switch tubes are in short circuit fault.
The acquisition module is connected with the resistance shunt module and used for acquiring the voltage of the storage battery pack monomer to obtain a monitoring signal;
the conversion module is connected with the acquisition module and used for converting the monitoring signals into monitoring data and transmitting the monitoring data to the processing module;
preferably, the conversion module includes: the sensing unit is used for transmitting the bipolar analog signal of the monitoring signal of the storage battery pack to the signal conditioning unit; the signal conditioning unit is used for converting the bipolar analog signal of the monitoring signal into a unipolar analog signal; and the digital conversion unit is used for converting the unipolar analog signals into monitoring data and transmitting the monitoring data to the processing module.
Preferably, the signal conditioning unit includes a low-pass filtering unit, a precise absolute value unit, and a precise amplifying unit, wherein:
the low-pass filtering unit filters high-frequency interference in the bipolar analog signal received from the sensing unit and then transmits the filtered high-frequency interference to the precise absolute value unit; the precise absolute value unit converts the bipolar analog signal into a unipolar analog signal and transmits the unipolar analog signal to the precise amplification unit; the precise amplifying unit amplifies the unipolar analog signal to meet the requirement of the digital conversion unit and transmits the unipolar analog signal to the digital conversion unit.
The processing module is connected with the conversion module and used for processing the monitoring data to obtain the weighted sum and the average voltage deviation value of the storage battery monomer;
preferably, the processing module includes: the voltage processing unit is used for obtaining voltage change data of the storage battery pack monomer in each time period according to the monitoring data; the weighting processing unit is used for weighting the difference value between the voltage change data of the storage battery pack monomer in each time period and the voltage change minimum value in the corresponding time period to obtain a weighted sum; and the voltage difference unit is used for obtaining the difference between the voltage of each storage battery monomer and the average voltage in a fixed time period according to the monitoring signal value and obtaining the average voltage deviation value.
Preferably, the performances of the single batteries of the same battery pack are mostly similar under the same charging and discharging current, but the performances of some batteries are different. The performance of the battery can be estimated by comprehensively considering the deviation of each battery from the average voltage in the period of time and the voltage change of each battery in the period of time. The cell performance is relatively good with small cell voltage excursions and small voltage variations. Since none of the batteries fail by showing a slow voltage rise during charging and a slow voltage drop during discharging. The specific method comprises the following steps: during charging and discharging of the battery pack, voltage change Δ u in the same time was calculated for each single cell every 5 minutes, and evaluation was performed at the same time. Different evaluation standards are adopted in the charging and discharging processes respectively. The weighted sum of the difference between the voltage change value (rise value during charging and fall value during discharging) in each time period and the voltage change minimum value (rise value during charging and fall value during discharging) in each time period is used as a performance evaluation basis since the battery operates, and the smaller the weighted sum is, the better the battery performance is when the voltage is changed to the diagnosis standard. Meanwhile, the difference between the voltage of each single cell and the average voltage is calculated every 500ms, and the battery performance with large deviation from the average voltage is poor. And the final evaluation value of the battery performance can be obtained by comprehensively considering the two performance evaluation bases.
The early warning module is connected with the processing module and used for comparing the weighted sum and the average voltage deviation value with corresponding preset threshold values to generate early warning signals;
preferably, the early warning module includes: the judging unit is used for comparing the weighted sum and the average voltage deviation value with corresponding preset threshold values, and if the weighted sum and the average voltage deviation value exceed the corresponding preset threshold values, an early warning signal is sent out;
and the communication unit is used for acquiring the target fault storage battery monomer according to the early warning signal through a communication network and generating a processing signal.
Preferably, the communication network may comprise a controller area network. In addition, each battery cell in the plurality of control modules may be configured with a unique hardware address to ensure identification when communicating over the controller area network. Advantageously, a fault occurring in a particular battery cell can be more easily identified based on the unique hardware address of the control module assigned to monitor the operating characteristics of the particular battery cell or group of battery cells.
And the control module is connected with the fault early warning module and used for controlling the storage battery pack to normally operate.
Preferably, the control module includes: the fault-tolerant unit is used for receiving a processing signal By configuring a By-pass for the storage battery monomer, starting the By-pass corresponding to the target fault storage battery monomer, removing the target fault storage battery monomer and generating an operation signal; and the control unit is used for controlling the normal operation of the new storage battery pack by receiving the operation signal.
In some embodiments, for a high voltage battery pack in the space domain, for example, 240 battery packs connected in series, the system reliability can be significantly improved By designing the By-pass bypass. In the aspect of system optimization, a bypass switch cannot be arranged for each storage battery monomer, a plurality of (6, 8 or 12, and can be specifically arranged according to task requirements subsequently) series-connected monomers can be considered to configure 1 By-pass according to a storage battery sub-module design scheme, so that when any monomer in a corresponding group has a short circuit or open circuit fault to influence the work of the storage battery, the corresponding By-pass is started, the rejection of the series-connected group where the fault monomer is located is completed, and the functional performance of the rest storage battery can meet the requirement.
In the embodiment, a series form double-switch design is adopted, so that the balancing function can be realized after one switch tube is in short-circuit fault, and the safety and reliability of the lithium ion storage battery pack under the condition of the balancing fault are ensured. When a certain part of the battery monomers of the storage battery pack in the space field have faults and short circuit or open circuit faults of any monomer in a corresponding group affect the work of the storage battery pack, the corresponding bypass switch is started, the rejection of the group in which the fault storage battery pack monomer is positioned is completed, the functional performance of the rest storage battery pack is ensured to meet the requirements, and the reliability and the safety of the work of the high-power storage battery pack in the space field are greatly improved through the control schemes.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. A battery pack fault management system, comprising:
the resistance shunt module is used for monitoring the line condition of the storage battery pack;
the acquisition module is connected with the resistance shunt module and used for acquiring the voltage of the storage battery pack monomer to obtain a monitoring signal;
the conversion module is connected with the acquisition module and used for converting the monitoring signals into monitoring data and transmitting the monitoring data to the processing module;
the processing module is connected with the conversion module and used for processing the monitoring data to obtain the weighted sum and the average voltage deviation value of the storage battery pack monomer;
the early warning module is connected with the processing module and used for comparing the weighted sum and the average voltage deviation value with corresponding preset threshold values to generate early warning signals;
and the control module is connected with the early warning module and is used for controlling the storage battery pack to normally operate By configuring a By-pass bypass.
2. The battery pack failure management system according to claim 1,
the resistance shunt module includes: a shunt switch unit and a drive switch unit; the shunt switch unit is used for preventing short circuit caused by resistor shunt; and the driving switch unit is used for monitoring the line condition of the corresponding storage battery monomer after one switch has a short-circuit fault.
3. The battery pack fault management system of claim 1, wherein the conversion module comprises:
the sensing unit is used for transmitting a monitoring signal of the storage battery pack monomer to the signal conditioning unit, wherein the monitoring signal is a bipolar analog signal;
the signal conditioning unit is used for converting the bipolar analog signal into a unipolar analog signal;
and the digital conversion unit is used for converting the unipolar analog signals into monitoring data and transmitting the monitoring data to the processing module.
4. The battery pack fault management system of claim 3,
the signal conditioning unit comprises a low-pass filtering unit, a precise absolute value unit and a precise amplifying unit, wherein:
the low-pass filtering unit is used for filtering high-frequency interference in the bipolar analog signal to obtain a target bipolar analog signal;
the precise absolute value unit is used for converting the target bipolar analog signal into a unipolar analog signal;
the precise amplifying unit is used for amplifying the unipolar analog signals and transmitting the unipolar analog signals to the digital conversion unit.
5. The battery pack fault management system of claim 1, wherein the processing module comprises:
the voltage processing unit is used for acquiring voltage change data of the storage battery pack monomer in each time period according to the monitoring data;
the weighting processing unit is used for weighting the difference value between the voltage change data of the storage battery pack monomer in each time period and the voltage change minimum value in the corresponding time period to obtain a weighted sum;
and the voltage difference unit is used for obtaining the difference between the single voltage of each storage battery pack and the average voltage in a fixed time period according to the monitoring data and obtaining the average voltage deviation value.
6. The battery pack fault management system of claim 1, wherein the early warning module comprises:
the judging unit is used for comparing the weighted sum and the average voltage deviation value with corresponding preset thresholds, and if the weighted sum and the average voltage deviation value exceed the corresponding preset thresholds, an early warning signal is sent out;
and the communication unit is used for acquiring the position information of the target fault storage battery pack monomer according to the early warning signal through a communication network and generating a processing signal.
7. The battery pack fault management system of claim 6, wherein the control module comprises:
the fault-tolerant unit is used for receiving the processing signal By configuring a By-pass bypass for the storage battery unit, starting the By-pass bypass corresponding to the target fault storage battery unit, removing the target fault storage battery unit and generating an operation signal;
and the control unit is used for controlling the normal operation of the new storage battery pack based on the received operation signal.
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| CN202210721770.XA CN115275386A (en) | 2022-06-24 | 2022-06-24 | Storage battery pack fault management system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118074284A (en) * | 2024-04-16 | 2024-05-24 | 上海融和元储能源有限公司 | Energy storage battery inconsistency analysis and balance management system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118074284A (en) * | 2024-04-16 | 2024-05-24 | 上海融和元储能源有限公司 | Energy storage battery inconsistency analysis and balance management system |
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