Parallel grouping system for value limit utilization of single batteries and control method

Abstract

The invention discloses a parallel grouping system and a control method for value limit utilization of single batteries, the system comprises n single batteries and two-way adapters in one-to-one correspondence with the single batteries, and n is a positive integer; the single batteries are connected in parallel to the direct current bus after passing through the bidirectional adapter, and the types, nominal capacity / actual capacity and manufacturers of the single batteries can be the same, partially different or completely different; the bidirectional adapters convert the voltages of the corresponding single batteries into bus voltages and make the single batteries output currents respectively. By adopting the technical scheme, the charging and discharging of the single batteries are controlled by the bidirectional adapter, so that the batteries can be freely and flexibly combined, and the performance of the single batteries is not influenced by the storage battery with the lowest performance.

Description

Technical Field

[0001] The invention belongs to the technical field of communication, and relates to a parallel grouping system and a control method for utilizing the value limit of single cells. Background Art

[0002] In recent years, domestic telecom operators, financial industry and Internet operators have been building cloud computing centers and IDC rooms, and the power consumption of communication base stations has increased. At the same time, the power generation power of the existing power supply mode includes the battery charging power. Therefore, the configuration scale of the communication base station generator is huge and the construction investment is large. The existing communication station generators ensure the normal operation of the communication load and charge the batteries at the same time, and the power generation cost is high. In addition, due to the configuration time and the requirements of upgrading, the base station may be equipped with batteries of different performance or models. Under the existing mode, the performance of each battery will be affected by the battery with the lowest performance, resulting in charging and discharging restrictions. Summary of the invention

[0003] The object of the present invention is to provide a parallel grouping system and a control method for utilizing the value limit of single cells, so as to solve the problem that the performance of each battery is affected by the battery with the lowest performance, resulting in charging and discharging restrictions.

[0004] In order to achieve the above object, the basic scheme of the present invention is: a parallel group system for utilizing the value of single cells to the maximum extent, comprising n single cells and bidirectional adapters corresponding to the single cells one by one, wherein n is a positive integer;

[0005] Each single battery is connected in parallel to the DC bus through a bidirectional adapter. The type, nominal capacity / actual capacity, and manufacturer of each single battery may be the same, partially different, or completely different.

[0006] The bidirectional adapter converts the voltage of the corresponding single battery to the bus voltage and enables the single battery to output current.

[0007] The working principle and beneficial effects of this basic solution are: this technical solution uses a bidirectional adapter to control the charging and discharging of single cells, realizing any flexible combination of batteries, and the performance of single cells is not affected by the battery with the lowest performance. The type of single cells, the nominal capacity / actual capacity of the battery cells, and the manufacturer can be the same, partially different, or completely different. The number of single cells in parallel can be flexibly configured as needed, depending on the battery backup time requirement and the load size, which is convenient for system reuse and expansion, and increases applicability. The voltage of each single cell is converted to the bus voltage, and the single cells are made to output current, realizing the maximum value utilization of the single cells.

[0008] In the same parallel system, the type, nominal capacity / actual capacity and manufacturer of each single battery can be different, so any flexible combination can be achieved. The bidirectional adapter can flexibly adjust the voltage between the battery end and the bus end based on efficiency and cost.

[0009] Furthermore, it also includes a monitoring unit, which is connected to all the bidirectional adapters.

[0010] The monitoring unit can be set up to monitor the operation of the equipment and obtain information, and can also control the two-way adapter accordingly, which is flexible to use.

[0011] Furthermore, two or more single cells are connected in series and then connected to a bidirectional adapter, and multiple bidirectional adapters are connected in parallel, and the single cells connected in series meet the minimum voltage requirement of the battery terminal of the bidirectional adapter.

[0012] If the single cell voltage is too low and the bus-end boost value is too high, resulting in low efficiency / high cost, two or more bidirectional adapters can be connected in series to meet the minimum voltage requirement of the battery end of the bidirectional adapter, and multiple bidirectional adapters can be connected in parallel on this basis.

[0013] Furthermore, the single cell battery includes one of a lead-acid battery, a lithium iron phosphate battery or a ternary lithium battery, or any combination thereof.

[0014] Select the required battery type according to your needs for easy use.

[0015] Furthermore, it also includes a plurality of series-connected battery packs directly connected to the DC bus.

[0016] The series-connected battery pack on the DC bus provides basic backup power, and multiple single cells are connected in parallel to maximize the value of the single cells.

[0017] The present invention also provides a charging control method for a parallel group system based on the value limit utilization of the single battery of the present invention, which adopts one of the following schemes:

[0018] Solution 1: When the external mains is powered, the bidirectional adapter at the front end of each single battery controls the single battery to charge according to the set voltage and current and the equalized floating charge management;

[0019] Solution 2: For aging and reused single cells, according to the actual needs of battery manufacturers for professional battery maintenance analysis, a customized charging strategy based on a bidirectional adapter is used to activate and repair the single cells. The customized charging strategy includes small current trickle charging, large current charging, customized pulse current charging, and high voltage charging.

[0020] This charging control method is based on a bidirectional adapter and a customized charging strategy to achieve precise charging.

[0021] The present invention also provides a discharge control method for a parallel group system based on the value limit utilization of the single battery of the present invention, which adopts one of the following methods:

[0022] Method 1: When discharging, the single battery is controlled to output a constant current according to the set current until the discharge protection is achieved and the parallel system is exited;

[0023] Method 2: Based on the actual demand of the back-end load current, the monitoring unit controls the current equalization output of each single battery currently connected in parallel, or distributes the output current of each single battery according to the SOC / SOH capacity ratio, and discharges synchronously to low voltage protection.

[0024] The discharge control method performs coordinated discharge and has simple control.

[0025] Furthermore, in the first method, after the external mains power is cut off, the bidirectional adapter follows the discharge voltage of the battery pack on the DC bus to achieve constant current output.

[0026] Use a bidirectional adapter to ensure power supply.

[0027] Further, in the second method, when the DC power system is backed up, if the external mains power fails, the bidirectional adapters at the front end of the multiple batteries can achieve zero-time switching during the charge-discharge conversion process;

[0028] When the external mains power is off and the single battery is fully discharged, a constant voltage is output to the load end.

[0029] When there is a power outage in the city, ensure the power supply to the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic flow chart of a parallel grouping system for utilizing the value of single battery cells to the maximum extent according to the present invention. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] In the description of the present invention, it is necessary to understand that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0034] The present invention discloses a parallel grouping system for utilizing the value of single cells to the maximum extent, such as Figure 1 As shown, it includes n single cells and bidirectional adapters corresponding to the single cells one by one, where n is a positive integer. Preferably, the single cell can be any single cell, specifically but not limited to lead-acid battery, lithium iron phosphate battery or ternary lithium battery, etc., specifically including one of lead-acid battery, lithium iron phosphate battery or ternary lithium battery or any combination thereof, and the required battery type can be selected according to the needs for easy use.

[0035] Each single cell is connected in parallel to the DC bus through a bidirectional adapter, and the DC bus is electrically connected to the communication load (intelligent DCDU). The type, nominal capacity / actual capacity, and manufacturer of each single cell can be the same, partially different, or completely different, to achieve any flexible combination. The bidirectional adapter converts the voltage of the corresponding single cell to the bus voltage, and enables the single cell to output current, controlling the single cell voltage to a minimum of 1.7-48V to upgrade the voltage efficiency and cost.

[0036] The bidirectional adapter is used to control the charge and discharge of the single battery, so as to realize any flexible combination of batteries. The performance of the single battery is not affected by the battery with the lowest performance. The number of single batteries in parallel can be flexibly configured according to the needs, depending on the battery backup time requirement and the load size.

[0037] In the same parallel system, the type, nominal capacity / actual capacity and manufacturer of each single battery can be different, so any flexible combination can be achieved. The bidirectional adapter can flexibly adjust the voltage between the battery end and the bus end based on efficiency and cost.

[0038] In a preferred embodiment of the present invention, the battery parallel group system further includes a monitoring unit, which is electrically connected to all bidirectional adapters via a CAN bus, and can be electrically connected to a remote terminal (such as a computer, etc.) or other external devices via an RS485 interface, etc. The monitoring unit can be set to monitor the operation of the equipment, obtain information, and can also control the bidirectional adapter accordingly, which is flexible to use.

[0039] In a preferred embodiment of the present invention, two or more single cells are connected in series and then connected to a bidirectional adapter, and multiple bidirectional adapters are connected in parallel, and the single cells connected in series meet the minimum voltage requirement of the battery terminal of the bidirectional adapter.

[0040] If the single cell voltage is too low and the bus-end boost value is too high, resulting in low efficiency / high cost, two or more cells can be connected in series to meet the minimum voltage requirement of the battery end of the bidirectional adapter, and on this basis, multiple bidirectional adapters can be connected in parallel.

[0041] In a preferred embodiment of the present invention, the battery parallel group system further comprises a plurality of series-connected battery groups directly and electrically connected to the DC bus. The series-connected battery groups on the DC bus achieve basic backup power guarantee, and the plurality of single cells are connected in parallel to maximize the value of the single cells.

[0042] The present invention also provides a charging control method for a parallel group system based on the value limit utilization of the single battery of the present invention, which adopts one of the following schemes:

[0043] Solution 1: When the external mains is powered, the bidirectional adapter at the front end of each single battery controls the single battery to charge according to the set voltage and current and the equalized floating charge management;

[0044] Solution 2: For aging and reused single cells, according to the actual needs of battery manufacturers for professional battery maintenance analysis, a customized charging strategy based on a bidirectional adapter is used to activate and repair the single cells. The customized charging strategy includes small current trickle charging, large current charging, customized pulse current charging, high voltage charging, etc.

[0045] The present invention also provides a discharge control method for a parallel group system based on the value limit utilization of the single battery of the present invention, which adopts one of the following methods:

[0046] Method 1: When discharging, the single battery is controlled to output a constant current according to the set current until the discharge protection is achieved and the parallel system is exited;

[0047] Method 2: Based on the actual demand of the back-end load current, the monitoring unit controls the current equalization output of each single battery currently connected in parallel, or distributes the output current of each single battery according to the SOC / SOH capacity ratio, and discharges synchronously to low voltage protection.

[0048] In a preferred solution of the present invention, in method 1, after the external mains power is cut off, the bidirectional adapter follows the discharge voltage of the battery pack on the DC bus to achieve constant current output.

[0049] In a preferred solution of the present invention, in the second mode, when the DC power supply system is backed up, if the external city power fails, the bidirectional adapters at the front ends of the multiple batteries realize zero-time switching during the charge-discharge conversion process;

[0050] When the external mains power is off and the single battery is fully discharged, a constant voltage is output to the load end.

[0051] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or 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 may be combined in any one or more embodiments or examples in a suitable manner.

[0052] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A parallel group system for utilizing the value of single cells to the maximum extent, characterized in that: It includes n single cells and bidirectional adapters corresponding to the single cells one by one, wherein n is a positive integer; Each single battery is connected in parallel to the DC bus through a bidirectional adapter. The type, nominal capacity / actual capacity, and manufacturer of each single battery may be the same, partially different, or completely different. The bidirectional adapter converts the voltage of the corresponding single cell to the bus voltage, and enables the single cells to output current, thereby realizing the maximum value utilization of the single cells.

2. The parallel group system for utilizing the value limit of single battery as claimed in claim 1, characterized in that: A monitoring unit is also included, which is connected to all the bidirectional adapters.

3. The parallel grouping system for utilizing the value limit of single cells as claimed in claim 1, characterized in that: Two or more single cells are connected in series to a bidirectional adapter, and multiple bidirectional adapters are connected in parallel. The single cells connected in series meet the minimum voltage requirement of the battery terminal of the bidirectional adapter.

4. The parallel grouping system for utilizing the value limit of single cells as claimed in claim 1, characterized in that: The single cell battery includes one of a lead-acid battery, a lithium iron phosphate battery or a ternary lithium battery, or any combination thereof.

5. The parallel grouping system for utilizing the value limit of single battery as claimed in claim 1, characterized in that: It also includes a plurality of series-connected storage battery groups directly connected to the DC bus.

6. A charging control method for a parallel group system based on the utilization of the value limit of the single battery as claimed in any one of claims 1 to 5, characterized in that: Use one of the following options: Solution 1: When the external mains is available, the bidirectional adapter at the front end of each single battery controls the single battery to charge according to the set voltage and current and the equalized floating charge management; Solution 2: For aging and reused single cells, according to the actual needs of battery manufacturers for professional battery maintenance analysis, a customized charging strategy based on a bidirectional adapter is used to activate and repair the single cells. The customized charging strategy includes small current trickle charging, large current charging, customized pulse current charging, and high voltage charging.

7. A discharge control method for a parallel group system based on the utilization of the value limit of the single battery as claimed in any one of claims 1 to 5, characterized in that: Use one of the following methods: Method 1: When discharging, the single battery is controlled to output a constant current according to the set current until the discharge protection is achieved and the parallel system is exited; Method 2: Based on the actual demand of the back-end load current, the monitoring unit controls the current equalization output of each single battery currently connected in parallel, or distributes the output current of each single battery according to the SOC / SOH capacity ratio, and discharges synchronously to low voltage protection.

8. The discharge control method according to claim 7, characterized in that: In the first method, after the external mains power is cut off, the bidirectional adapter follows the discharge voltage of the battery pack on the DC bus to achieve constant current output.

9. The discharge control method according to claim 7, characterized in that: In the second method, when the DC power system is backed up, if the external mains power fails, the bidirectional adapters at the front end of the multiple batteries can achieve zero-time switching during the charge and discharge conversion process; When the external mains power is off and the single battery is fully discharged, a constant voltage is output to the load end.

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