A battery online maintenance method

Abstract

The present invention discloses a method for online maintenance of a battery, including a power grid branch, a UPS module, a battery and a battery maintenance system. The power grid branch includes a power grid, a bypass switch and a load. The battery maintenance system includes a discharge circuit, a monitoring circuit, a control circuit, a battery switching switch and a discharge control switch. The battery maintenance system is powered by a battery, and the voltage of the battery and the voltage of the power grid are monitored by a monitoring circuit. An online maintenance method for a battery includes event maintenance and active maintenance, and the regular discharge and charging of the battery and the charging of the battery after commissioning are completed by a discharge circuit, and strategies are formulated from two aspects to maintain the battery. The present invention completes the regular discharge and charging of the battery by a discharge circuit, and the battery can be charged in time after the power grid is cut off. It is scientific, reasonable, safe, simple, and time-saving, and can maximize the service life of the battery and the UPS device.

Description

Technical Field

[0001] The invention relates to an online maintenance system, and in particular to an online maintenance method for a battery. Background Art

[0002] In the uninterruptible power supply (UPS) system, a large number of batteries are used as backup power systems. During the use of batteries, over time, they are prone to undercharge, overcharge and other states. Due to the lack of effective maintenance methods, these batteries are prone to premature water loss, aging and other problems, which shortens their service life.

[0003] Daily maintenance of batteries is difficult to manage. Battery management is in a situation of "no monitoring and no control" or "only monitoring but no control". Faults and hidden dangers cannot be discovered in time. Maintenance is done only when there is a problem with the battery, which has high safety risks, passive maintenance and low efficiency. Maintenance work is time-consuming and labor-intensive, and it is actually impossible to fully implement it, resulting in a lack of basic data basis for battery maintenance. Replacement of the entire battery has become the current maintenance guarantee mode. There is a lack of effective battery management methods, and the actual life of the battery after it is put into use is far lower than the designed life. Frequent over-discharge, deep discharge with low current, discharge with high current at low temperature, untimely replenishment, insufficient charging, excessive acid density, lack of water inside the battery, and long-term shelving have become the reasons for reduced capacity and shortened life.

[0004] The UPS devices in the prior art generally do not have a battery online maintenance function, which is extremely inconvenient for battery maintenance and greatly affects the service life of the battery and even the entire UPS device. It can no longer meet people's needs and is in urgent need of improvement. Summary of the invention

[0005] The purpose of the present invention is to provide a battery online maintenance method to solve the shortcomings of the prior art.

[0006] The present invention is implemented by the following technical solutions:

[0007] A battery online maintenance system includes a power supply and a load, characterized in that a bypass switch is connected between the power supply and the load, a UPS device is connected across both ends of the bypass switch, the UPS device is connected to the battery through a battery switching switch, the battery is also connected to a discharge circuit and a control circuit respectively through a discharge control switch, the discharge circuit is used to discharge the battery, the control circuit is connected to the bypass switch, and is used to control the closing and opening of the bypass switch, and the monitoring circuit is connected to the battery, and the monitoring circuit is used to monitor the voltage of the battery and the voltage of the power grid.

[0008] A battery online maintenance method, characterized in that the online maintenance method specifically includes: setting the number of days of active maintenance cycle, when the number of days reaches the preset number of days, the monitoring circuit monitors whether the voltage of the power grid is normal, starts the active maintenance program, the discharge control switch is turned on, and the discharge circuit performs rapid deep discharge on the battery;

[0009] The monitoring circuit monitors whether the battery voltage reaches the discharge cut-off voltage. If so, the discharge is stopped. Alternatively, when the monitoring circuit detects that the grid power supply is outside the normal range, it first determines whether the battery voltage is lower than the discharge cut-off voltage. If the battery voltage is not lower than the discharge cut-off voltage, no other operations are performed, and the timer continues to count the number of days.

[0010] If the battery voltage reaches the discharge cut-off voltage, the discharge control switch is disconnected, the battery switching switch is turned on, and the battery is charged by the grid power supply. The monitoring circuit monitors whether the battery voltage reaches the charge cut-off voltage. If it reaches the charge cut-off voltage, charging is stopped.

[0011] The counter is reset to zero and a new round of timing begins.

[0012] Furthermore, when the voltage of the grid power supply is within a normal range, the timer counts the number of days and does not perform other operations.

[0013] Furthermore, the active maintenance cycle is preset to 180 days.

[0014] The beneficial technical effect of the present invention is that the maintenance system monitors the status of the power grid and the battery, and implements event maintenance and active maintenance according to the maintenance strategy. By setting the maintenance cycle and method scientifically and reasonably, the service life of the battery and UPS device can be maximized, and the maintenance process is safe, convenient, fast, time-saving and labor-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the principle block diagram of the battery online maintenance circuit.

[0016] Figure 2 It is a flow chart of the battery online maintenance circuit. DETAILED DESCRIPTION

[0017] The following description of the embodiments will help the public better understand the present invention, but the specific embodiments given by the applicant cannot and should not be regarded as limitations on the technical solutions of the present invention. Any changes to the definitions of components or technical features and / or formal but not substantial changes to the overall structure should be regarded as the scope of protection defined by the technical solutions of the present invention.

[0018] Explanation of the reference numerals: grid branch 1, UPS module 2, battery 3, battery maintenance system 4, grid power supply 11, bypass switch K1, load 12, discharge circuit 41, monitoring circuit 42, control circuit 43.

[0019] like Figure 1 As shown, the battery online maintenance system is arranged in the power grid branch 1, the power grid branch 1 includes the power grid 11, the bypass switch K1 and the load 12, the battery online maintenance system includes the UPS device 2, the battery 3, the battery maintenance system 4, the discharge circuit 41, the monitoring circuit 42, the control circuit 43, the battery switching switch K2 and the discharge control switch K3, the battery maintenance system 4 is powered by the battery 3, the voltage of the battery 3 and the voltage of the power grid 11 are monitored by the monitoring circuit 42, and the bypass switch K1, the battery switching switch K2 and the discharge control switch K3 are controlled by the control circuit 43. The battery maintenance system 4 is always in an online state and is powered by the battery 3. The battery maintenance system 4 monitors the voltage of the battery 3 and the voltage of the power grid 11 through the monitoring circuit 42 as the basis for issuing control instructions, and the battery maintenance system 4 controls the on and off of the bypass switch K1, the battery switching switch K2 and the discharge control switch K3 through the control circuit 43.

[0020] The discharge circuit 41 is used to discharge the battery, the control circuit 43 is used to control the closing and opening of the bypass switch K1, and the monitoring circuit 42 is connected to the battery 3. The monitoring circuit 42 is used to monitor the voltage of the battery 3 and the voltage of the grid power supply 11.

[0021] Preferably, the discharge circuit 41 is a DC-DC circuit, which can quickly discharge by controlling the discharge current to quickly complete the battery maintenance work. The monitoring circuit 42 can use a voltage sensor or a voltage transformer to collect the voltage value, and the control circuit 43 can use a relay control method.

[0022] The working principle of this embodiment is: when the system is normally powered by the grid power supply 11, the bypass switch K1 is in the disconnected state, and the battery switching switch K2 is in the disconnected state. The grid power supply 11 passes through the rectifier and inverter in the UPS module 2 to supply power to the load 12. When the UPS device fails or is under maintenance, the bypass switch K1 is turned on to repair the UPS device.

[0023] When the grid power 11 is powered off, the battery switching switch K2 is turned on, and the UPS module switches the battery 3 into the power supply system to supply power to the load 12, thereby realizing uninterrupted power switching. When the grid power 11 is restored, the grid power 11 is divided into two paths, one of which passes through the rectifier and inverter in the UPS module 2 to provide power to the load 12, and the other is used to charge the battery 3.

[0024] The method for implementing online maintenance of the battery is: start to monitor whether the voltage of the grid power supply 11 is normal through the monitoring circuit 42. When the voltage of the grid power supply 11 is within the normal range, the timer counts the number of days and does not perform other operations. Generally speaking, the active maintenance cycle can be determined according to the actual parameters of the battery. For example, the number of days can be preset to 180 days. When the number of days reaches the preset number of days, the system starts to judge whether to perform active maintenance. Generally speaking, the active maintenance program should be started at this time: the discharge control switch K3 is turned on, and the discharge circuit 41 performs rapid deep discharge on the battery 3. When the voltage value of the battery 3 monitored by the monitoring circuit 42 reaches the discharge cut-off voltage, the discharge is stopped. Then the discharge control switch K3 is turned off, the battery switching switch K2 is turned on, and the grid power supply 11 charges the battery 3. When the voltage value of the battery 3 monitored by the monitoring circuit 42 reaches the charging cut-off voltage, the charging is stopped. This active maintenance work is completed, the counter is reset, and a new round of timing begins.

[0025] When the monitoring circuit 42 detects that the grid power supply 11 is outside the normal range, it is first determined whether the voltage of the battery 3 is lower than the discharge cut-off voltage. If the voltage of the battery 3 is not lower than the discharge cut-off voltage, no other operations are performed, and the timer continues to count the number of days. If the voltage of the battery 3 is lower than the discharge cut-off voltage, the battery 3 should be charged immediately, that is, the battery switching switch K2 is turned on, the discharge control switch K3 is turned off, and the grid power supply 11 charges the battery 3. When the voltage value of the battery 3 monitored by the monitoring circuit 42 reaches the charging cut-off voltage, the charging is stopped. The maintenance work of this event is completed, the counter is reset, and a new round of timing begins.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "example", "for example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0027] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A battery online maintenance method, characterized in that: Applied to a battery online maintenance system, the battery online maintenance system includes a power supply and a load, a bypass switch is connected between the power supply and the load, a UPS device is connected across both ends of the bypass switch, the UPS device is connected to the battery through a battery switching switch, the battery is also connected to a discharge circuit and a control circuit respectively through a discharge control switch, the discharge circuit is used to discharge the battery, the control circuit is connected to the bypass switch, and is used to control the closing and opening of the bypass switch, the monitoring circuit is connected to the battery, and the monitoring circuit is used to monitor the voltage of the battery and the voltage of the grid power supply, the battery maintenance system is powered by the battery, the battery voltage and the grid power supply voltage are monitored by the monitoring circuit, the bypass switch, the battery switching switch, and the discharge control switch are controlled by the control circuit, the battery maintenance system is always in an online state, and is powered by the battery, the battery maintenance system monitors the battery voltage and the grid power supply voltage through the monitoring circuit as the basis for issuing control instructions, specifically: When the system is normally powered by the grid power supply, the bypass switch is in the disconnected state, the battery switching switch is in the disconnected state, and the grid power passes through the rectifier and inverter in the UPS module to supply power to the load 12. When the UPS device fails or is under maintenance, the bypass switch K1 is turned on to repair the UPS device; When the grid power fails, the battery switching switch is turned on, and the UPS module switches the battery into the power supply system to supply power to the load, achieving uninterrupted power switching; When the grid power is restored, the grid power is divided into two paths, one of which passes through the rectifier and inverter in the UPS module to provide power to the load, and the other is used to charge the battery; The online maintenance method specifically includes: setting the number of days for active maintenance cycle, when the number of days reaches the preset number of days, the monitoring circuit monitors whether the voltage of the power grid is normal, starts the active maintenance program, turns on the discharge control switch, and the discharge circuit quickly and deeply discharges the battery; The monitoring circuit monitors whether the battery voltage reaches the discharge cut-off voltage. If so, the discharge is stopped. Alternatively, when the monitoring circuit detects that the grid power supply is outside the normal range, it first determines whether the battery voltage is lower than the discharge cut-off voltage. If the battery voltage is not lower than the discharge cut-off voltage, no other operations are performed, and the timer continues to count the number of days. If the battery voltage reaches the discharge cut-off voltage, the discharge control switch is disconnected, the battery switching switch is turned on, and the battery is charged by the grid power supply. The monitoring circuit monitors whether the battery voltage reaches the charge cut-off voltage. If it reaches the charge cut-off voltage, charging is stopped. The counter is reset to zero and a new round of timing begins.

2. The battery online maintenance method according to claim 1, characterized in that: When the voltage of the grid power supply is within the normal range, the timer counts the number of days and does not perform other operations.

3. The battery online maintenance method according to claim 1 or 2, characterized in that: The preset period for active maintenance is 180 days.

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