CN105811487B - Battery pack, and automatic battery pack capacity calibration learning method and system - Google Patents

Battery pack, and automatic battery pack capacity calibration learning method and system Download PDF

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Publication number
CN105811487B
CN105811487B CN201410852036.2A CN201410852036A CN105811487B CN 105811487 B CN105811487 B CN 105811487B CN 201410852036 A CN201410852036 A CN 201410852036A CN 105811487 B CN105811487 B CN 105811487B
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bbu
bbus
automatic calibration
battery pack
calibration learning
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CN105811487A (en
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段小翔
戴庆军
陈业嘉
王玉东
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ZTE Corp
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ZTE Corp
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]

Abstract

A battery pack, a battery pack capacity automatic calibration learning method and a system are provided, the battery pack comprises a plurality of spare battery units BBU, and a backup power supply is provided for the system together, the method comprises the following steps: sequentially carrying out capacity automatic calibration learning on the plurality of BBUs, wherein when carrying out capacity automatic calibration learning on one BBU each time, other BBUs continue to provide a backup power supply for the system; and completing one-time capacity automatic calibration learning of the battery pack after the capacity automatic calibration learning of each BBU in the plurality of BBUs is completed. The invention does not interrupt the system service when the battery pack capacity is automatically calibrated and learned.

Description

Battery pack, and automatic battery pack capacity calibration learning method and system
Technical Field
The present invention relates to a battery pack, and more particularly, to a battery pack, a method and a system for learning automatic calibration of battery pack capacity.
Background
The Battery Backup Unit (BBU) plays an important role in the data power-down protection function of the disk array, when the system power supply of the whole array is suddenly powered down, in order to prevent data which is not brushed into a hard disk in a memory from being lost, the BBU or a battery pack consisting of a plurality of BBUs must be used for supplying power to the system, and a corresponding method is adopted for protecting the memory data.
Because the characteristics of the lithium battery require corresponding protection circuits for charge and discharge protection, and for a storage system, parameters such as the health state and the capacity of the lithium battery need to be known in real time, the lithium battery pack for storage is provided with a capacity metering chip and a related protection circuit. In the long-term use process of the lithium battery pack, the conditions of unbalance among all combined battery cores, inaccurate capacity metering deviation and the like can occur. Particularly in a storage system, the temperature is generally high, and the battery pack is in a state of being close to full flush for a long time, which causes large deviation of the capacity measurement of the battery pack, so that the capacity calibration learning (learning) of the battery is required to be performed regularly (the period is generally different from three months to half a year according to the cell condition).
The capacity auto-calibration learning methods adopted in the industry at present are basically two: firstly, when capacity automatic calibration learning is carried out, a main control single board powered by a battery pack is adopted to discharge a battery (the main control single board sets power consumption to be controlled in a certain range through software); and the second method comprises the following steps: the main control board is provided with a special discharge load, and the battery pack is periodically subjected to discharge calibration learning during capacity automatic calibration learning.
However, in both of these approaches, the storage system stops traffic in response to the battery pack capacity auto-calibration learning action. The battery pack has self charge and discharge calibration parameters, and in order to achieve ideal calibration, strict limits on discharge current, charge current and standing time after discharge need to be made, and as for the two calibration modes at present, the first calibration mode cannot completely achieve control of discharge current (power consumption of a system single board is difficult to control); second, the discharge current can be controlled well, but the battery pack used in a general storage system is large, and the collective discharge of a plurality of cells can cause a large amount of heat to be generated on the discharge load. In both cases the storage system takes a long service interruption. If the discharge current is increased and the standing time after discharge is shortened in order to save time, the accuracy problem of battery calibration is caused. These problems are also present for other systems that require the use of a battery pack as a backup power source.
In addition, the capacity of the battery pack required for different systems often varies, and if a battery pack of one capacity is produced for each system, it is disadvantageous to control costs and improve the utilization efficiency of the battery pack.
Disclosure of Invention
In view of the above, the present invention provides a battery pack, including a plurality of parallel branches and an ORING unit, wherein:
each parallel branch of the plurality of parallel branches comprises:
the input end of the spare battery unit BBU is connected with the power supply input end of the battery pack;
the input end of the boosting and current equalizing unit is connected with the output ends of the BBUs in the same parallel branch;
the input end of the ORING unit is connected with the output ends of the boosting and current equalizing units in the plurality of parallel branches, and the output end of the ORING unit is used as the power output end of the battery pack.
Preferably, the first and second liquid crystal films are made of a polymer,
the battery pack also comprises a load unit used for providing a load required by BBU discharge:
each parallel branch also comprises a switch unit connected between the BBU and the boosting and current-sharing unit, and the switch unit is used for communicating the output end of the BBU with the input end of the boosting and current-sharing unit or with the load unit according to a control signal.
The battery pack consists of a plurality of BBUs, so that battery packs with different capacities can be obtained by using some basic BBUs, and cost control and utilization rate improvement are facilitated.
In view of the above, the present invention further provides a method for automatic calibration and learning of capacity of a battery pack, where the battery pack includes a plurality of battery backup units BBUs that collectively provide a backup power supply for a system, and the method includes:
sequentially carrying out capacity automatic calibration learning on the plurality of BBUs, wherein when carrying out capacity automatic calibration learning on one BBU each time, other BBUs continue to provide a backup power supply for the system;
and completing one-time capacity automatic calibration learning of the battery pack after the capacity automatic calibration learning of each BBU in the plurality of BBUs is completed.
Preferably, the first and second liquid crystal films are made of a polymer,
the method further comprises the following steps:
when capacity automatic calibration learning is carried out on a BBU, if the system is abnormally powered down, the capacity automatic calibration learning of the BBU is stopped, and the BBU is added into power supply for the system.
Preferably, the first and second liquid crystal films are made of a polymer,
sequentially performing capacity auto-calibration learning on the plurality of BBUs, comprising: sequentially carrying out capacity automatic calibration learning on the BBUs according to the serial numbers of the BBUs, and recording the serial numbers of the BBUs currently carrying out the capacity automatic calibration learning;
the method further comprises the following steps: if the capacity automatic calibration learning of a certain numbered BBU is stopped due to abnormal power failure of the system, after the system power is recovered, the capacity automatic calibration learning is sequentially carried out on the BBUs which have not finished the capacity automatic calibration learning from the recorded numbered BBU.
Preferably, the first and second liquid crystal films are made of a polymer,
the method further comprises the following steps: before capacity automatic calibration learning is carried out on one BBU each time, the working states of all BBUs are detected, for example, a battery pack formed by other BBUs except the BBU can meet the requirement of a system on a backup power supply, and then the capacity automatic calibration learning is carried out on the BBU.
Preferably, the first and second liquid crystal films are made of a polymer,
the battery pack is a battery pack used in a storage system.
In view of the above, the present invention further provides an automatic battery capacity calibration learning system, which includes a battery and a control unit, wherein:
the battery pack adopts the battery pack;
and the control unit is connected with each BBU in the battery pack and is used for controlling the plurality of BBUs to sequentially perform capacity automatic calibration learning by sending control signals to the BBUs after the capacity automatic calibration learning of the battery pack is started, and other BBUs continue to provide a backup power supply for the system when one BBU is subjected to the capacity automatic calibration learning each time.
Preferably, the first and second liquid crystal films are made of a polymer,
the control unit sequentially performs capacity automatic calibration learning on the plurality of BBUs, and the capacity automatic calibration learning method comprises the following steps: sequentially carrying out capacity automatic calibration learning on the BBUs according to the serial numbers of the BBUs, and recording the serial numbers of the BBUs currently carrying out the capacity automatic calibration learning;
the control unit is also used for stopping the capacity automatic calibration learning of the BBU when the system is abnormally powered down when the capacity automatic calibration learning of the BBU is carried out on the BBU, and adding the BBU into the power supply of the system; and after the system power is recovered, sequentially carrying out capacity automatic calibration learning on the BBUs which have not finished the capacity automatic calibration learning from the recorded BBU with the number.
Preferably, the first and second liquid crystal films are made of a polymer,
the control unit sequentially performs capacity automatic calibration learning on the plurality of BBUs, and the capacity automatic calibration learning method comprises the following steps: before capacity automatic calibration learning is carried out on one BBU each time, the working states of all BBUs are detected, for example, a battery pack formed by other BBUs except the BBU can meet the requirement of a system on a backup power supply, and then the capacity automatic calibration learning is carried out on the BBU.
The method and the system finish the capacity automatic calibration learning of the battery pack by sequentially carrying out the capacity automatic calibration learning on the plurality of BBUs forming the battery pack, and when carrying out the capacity automatic calibration learning on one BBU, other BBUs continue to provide a backup power supply for the system, so the system does not need to interrupt service.
Drawings
Fig. 1 is a block diagram of an automatic battery capacity calibration learning system according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for automatically calibrating and learning the capacity of a two-battery pack according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Example one
In the present embodiment, a new battery pack and a battery pack system are provided for the problem that the battery pack capacity automatic calibration learning must stop the system service, please refer to fig. 1, the battery pack includes a plurality of parallel branches and an ORING unit, wherein:
each parallel branch of the plurality of parallel branches comprises:
the input end of the spare battery unit BBU is connected with the power supply input end of the battery pack;
a boost (boost) and current share (current share) unit, the input end of which is connected with the output end of BBU in the same parallel branch;
the input end of the ORING unit is connected with the output ends of the boosting and current equalizing units in the plurality of parallel branches, and the output end of the ORING unit is used as the power output end of the battery pack.
The number of BBUs included in one battery pack can be selectively adapted according to the requirements of the system on electric quantity and output current. Each BBU is formed by combining electric cores in series and parallel, and a complete charging and discharging circuit, a related electric quantity metering circuit and a protection circuit are arranged inside each BBU, and the BBU can also be called as a small battery pack.
The boosting and current-sharing units are mainly used for boosting the output voltages of the BBUs, the boosted voltages of the BBUs are consistent, and when a voltage difference occurs, current-sharing processing is performed to achieve output balance of the BBU units.
The ORING unit performs ORING processing on the outputs of the boosting and current equalizing units, so that the normal work of other BBUs is not influenced when a single BBU fails. The output of the ORING unit is provided to the system power supply.
Optionally, the battery pack is provided with a dedicated discharge load, in which case the battery pack further comprises:
a load unit, which is used for providing the load required by BBU discharge and can be served by a plurality of series of resistors (the resistance value is determined by the learning discharge current required by the cell characteristics); and
each parallel branch also comprises a switch unit connected between the BBU and the boosting and current-sharing unit, and is used for communicating the output end of the BBU with the input end of the boosting and current-sharing unit or with the load unit (when discharging the BBU) according to the control signal.
The battery pack comprises a plurality of BBUs, and the capacity of the battery pack is determined by the capacities of the BBUs, so that the battery packs with different capacities can be obtained by using some basic BBUs, and cost control and utilization rate improvement are facilitated.
Accordingly, as shown in fig. 1, the battery pack capacity automatic calibration learning system provided in this embodiment includes the above battery pack and a control unit, wherein:
and the control unit is connected with each BBU in the battery pack and is used for controlling the plurality of BBUs in the battery pack to sequentially perform capacity automatic calibration learning by sending control signals to the BBUs after the capacity automatic calibration learning of the battery pack is started, and other BBUs continue to provide a backup power supply for the system when one BBU is subjected to the capacity automatic calibration learning each time. The control unit may start the capacity auto-calibration learning of the battery pack after receiving a capacity calibration command issued by the Host (Host).
The control unit can be used for controlling the capacity automatic calibration and learning of the BBU, and can also be used for monitoring the health condition of the BBU, controlling the boosting and current-sharing unit, interacting relevant information with a host system (host) and the like.
Preferably, the control unit sequentially performs capacity auto-calibration learning on the plurality of BBUs, including: sequentially carrying out capacity automatic calibration learning on the BBUs according to the serial numbers of the BBUs, and recording the serial numbers of the BBUs currently carrying out the capacity automatic calibration learning; when the control unit performs capacity automatic calibration learning on a BBU, if the system is abnormally powered down, stopping the capacity automatic calibration learning of the BBU, and adding the BBU into power supply to the system; and after the system power is recovered, sequentially carrying out capacity automatic calibration learning on the BBUs which have not finished the capacity automatic calibration learning from the recorded BBU with the number.
Preferably, the control unit sequentially performs capacity auto-calibration learning on the plurality of BBUs, including: before capacity automatic calibration learning is carried out on one BBU each time, the working states of all BBUs are detected, for example, a battery pack formed by other BBUs except the BBU can meet the requirement of a system on a backup power supply, and then the capacity automatic calibration learning is carried out on the BBU.
Preferably, if the battery pack is configured with a special load unit, the control unit communicates the output of the BBU with the load unit (when the BBU is discharging) or with the boosting and current equalizing units of the same parallel branch by sending a control signal to the switch unit connected with the BBU.
Example two
This embodiment provides a method for learning and automatically calibrating capacity of a battery pack, which can be applied to a battery pack system in the first embodiment, where the battery pack includes a plurality of BBUs (battery backup units) that collectively provide a backup power supply for the system, as shown in fig. 2, and the method includes:
step 110, sequentially carrying out capacity automatic calibration learning on the plurality of BBUs, wherein when carrying out capacity automatic calibration learning on one BBU each time, other BBUs continue to provide a backup power supply for the system;
in this embodiment, preferably, before performing capacity auto-calibration learning on one BBU each time, the operating states of all BBUs are detected, for example, a battery pack formed by other BBUs except the BBU can meet the requirement of the system on a backup power supply, such as the requirement on capacity and current, and then perform capacity auto-calibration learning on the BBU. By the detection, when capacity automatic calibration learning is carried out on one BBU, if abnormal power failure occurs in the system, other BBUs can still provide enough backup power supplies.
In this embodiment, preferably, when performing capacity auto-calibration learning on a BBU, if the system is powered down abnormally, the capacity auto-calibration learning of the BBU is stopped, and the BBU is added to the power supply to the system. And the power supply of the battery pack can be more reliable by adding a BBU power supply. But this is optional for the present invention.
And step 120, completing the automatic calibration learning of the capacity of each BBU in the plurality of BBUs, namely completing the automatic calibration learning of the capacity of the battery pack.
When capacity automatic calibration learning is carried out on a BBU, full flushing processing is carried out on the BBU, a discharging mode is started after standing is carried out according to requirements, the output of the BBU is switched to a load, and discharging is carried out. And standing after the discharging is finished, starting a charging mode and recording the BBU to finish the test after the discharging and standing are finished, and releasing the control right of the learning period of the BBU after the charging electric quantity of the BBU reaches the lowest electric quantity requirement specified by the MCU to perform the learning period of the next BBU.
In step 110, sequentially performing capacity auto-calibration learning on the plurality of BBUs may include: sequentially carrying out capacity automatic calibration learning on the plurality of BBUs according to the numbering sequence (from size to size or from small to large) of the plurality of BBUs, and recording the number of the BBU currently carrying out the capacity automatic calibration learning; thus, if the capacity automatic calibration learning of a certain numbered BBU is stopped due to abnormal power failure of the system, after the system power is recovered (which may be recovered after C2F, or may be recovered after the next power-on), the capacity automatic calibration learning may be sequentially performed on the BBUs that have not completed the capacity automatic calibration learning, starting from the recorded numbered BBUs. Unnecessary repeated learning can thus be avoided.
In this embodiment, the battery pack is a battery pack used in a storage system. But the invention is not limited thereto.
By adopting the scheme of the embodiment, the battery pack comprising a plurality of BBUs and the corresponding system and method for automatically calibrating the capacity of the battery pack are adopted, each BBU operates independently, and battery learning and calibration are independently performed, so that the automatic calibration and learning of the capacity of the battery pack can be completed under the condition of not influencing the service operation of the system. Because the influence on the system service does not need to be considered, the battery can be more accurately measured after the battery is learned based on the charge and discharge parameters of the battery core characteristics, and the reliability of the power-down protection of the storage system is further improved. The battery pack and the capacity automatic calibration system and method of the embodiment are used in a system needing to provide backup power supply, and are particularly suitable for disk arrays in the storage field.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the foregoing embodiments may also be implemented by using one or more integrated circuits, and accordingly, each module/unit in the foregoing embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A method for automatically calibrating and learning the capacity of a battery pack, wherein the battery pack comprises a plurality of parallel branches and an ORING unit, each parallel branch in the plurality of parallel branches comprises a spare battery unit (BBU) and a boosting and current-sharing unit, the boosting and current-sharing unit is used for boosting and current-sharing the BBU, the ORING unit is used for ORING the output of the boosting and current-sharing units, so that the normal work of other BBUs is not influenced when a single BBU fails, and the BBUs provide a backup power supply for a system, and the method comprises the following steps:
sequentially carrying out capacity automatic calibration learning on the plurality of BBUs, wherein when carrying out capacity automatic calibration learning on one BBU each time, other BBUs continue to provide a backup power supply for the system;
and completing one-time capacity automatic calibration learning of the battery pack after the capacity automatic calibration learning of each BBU in the plurality of BBUs is completed.
2. The method of claim 1, wherein:
the method further comprises the following steps:
when capacity automatic calibration learning is carried out on a BBU, if the system is abnormally powered down, the capacity automatic calibration learning of the BBU is stopped, and the BBU is added into power supply for the system.
3. The method of claim 2, wherein:
sequentially performing capacity auto-calibration learning on the plurality of BBUs, comprising: sequentially carrying out capacity automatic calibration learning on the BBUs according to the serial numbers of the BBUs, and recording the serial numbers of the BBUs currently carrying out the capacity automatic calibration learning;
the method further comprises the following steps: if the capacity automatic calibration learning of a certain numbered BBU is stopped due to abnormal power failure of the system, after the system power is recovered, the capacity automatic calibration learning is sequentially carried out on the BBUs which have not finished the capacity automatic calibration learning from the recorded numbered BBU.
4. A method as claimed in claim 1, 2 or 3, characterized by:
the method further comprises the following steps: before capacity automatic calibration learning is carried out on one BBU each time, the working states of all BBUs are detected, for example, a battery pack formed by other BBUs except the BBU can meet the requirement of a system on a backup power supply, and then the capacity automatic calibration learning is carried out on the BBU.
5. A method as claimed in claim 1, 2 or 3, characterized by:
the battery pack is a battery pack used in a storage system.
6. A battery pack comprising a plurality of parallel branches and an ORING unit, wherein:
each parallel branch of the plurality of parallel branches comprises:
the input end of the spare battery unit BBU is connected with the power supply input end of the battery pack;
the input end of the boosting and current equalizing unit is connected with the output ends of the BBUs in the same parallel branch;
the input end of the ORING unit is connected with the output ends of the boosting and current equalizing units in the plurality of parallel branches, and the output end of the ORING unit is used as the power output end of the battery pack.
7. The battery pack of claim 6, wherein:
the battery pack also comprises a load unit used for providing a load required by BBU discharge:
each parallel branch also comprises a switch unit connected between the BBU and the boosting and current-sharing unit, and the switch unit is used for communicating the output end of the BBU with the input end of the boosting and current-sharing unit or with the load unit according to a control signal.
8. An automatic battery capacity calibration learning system, comprising a battery and a control unit, wherein:
the battery pack adopts the battery pack as claimed in claim 6;
and the control unit is connected with each BBU in the battery pack and is used for controlling the plurality of BBUs to sequentially perform capacity automatic calibration learning by sending control signals to the BBUs after the capacity automatic calibration learning of the battery pack is started, and other BBUs continue to provide a backup power supply for the system when one BBU is subjected to the capacity automatic calibration learning each time.
9. The system of claim 8, wherein:
the control unit sequentially performs capacity automatic calibration learning on the plurality of BBUs, and the capacity automatic calibration learning method comprises the following steps: sequentially carrying out capacity automatic calibration learning on the BBUs according to the serial numbers of the BBUs, and recording the serial numbers of the BBUs currently carrying out the capacity automatic calibration learning;
the control unit is also used for stopping the capacity automatic calibration learning of the BBU when the system is abnormally powered down when the capacity automatic calibration learning of the BBU is carried out on the BBU, and adding the BBU into the power supply of the system; and after the system power is recovered, sequentially carrying out capacity automatic calibration learning on the BBUs which have not finished the capacity automatic calibration learning from the recorded BBU with the number.
10. The system of claim 8 or 9, wherein:
the control unit sequentially performs capacity automatic calibration learning on the plurality of BBUs, and the capacity automatic calibration learning method comprises the following steps: before capacity automatic calibration learning is carried out on one BBU each time, the working states of all BBUs are detected, for example, a battery pack formed by other BBUs except the BBU can meet the requirement of a system on a backup power supply, and then the capacity automatic calibration learning is carried out on the BBU.
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