A kind of active compensation control management circuit with multiple strings of battery cells and unbalanced power loss

Abstract

The application relates to the field of power compensation of multiple strings of power cells, in particular to a power compensation control and management circuit with power compensation of multiple strings of power cells and imbalance, which comprises the following: multiple strings of power cells, power compensation circuits between the multiple strings of power cells are sequentially isolated and controlled to implement power compensation for multiple strings of power cells in time; the power compensation circuits of the multiple strings of power cells are connected in parallel; a plurality of first relays are evenly distributed on each string of power cells and used for controlling the on-off of the power cells; a charging module (primary-secondary isolation) is electrically connected with a power input end, the power input end can be alternating current or direct current, and is used for converting the voltage of the power input end into a charging voltage and converting alternating current into direct current; and a total relay is arranged between the charging module and the multiple strings of power cells and is used for controlling the on-off of all the power cells. The application can perform current-limiting power compensation on the battery when the system intermittently works, directly charges the battery by using the power cells, and improves the charging speed and charging efficiency.

Description

Technical Field

[0001] This application relates to the field of power replenishment for multiple strings of cells with low power, and in particular to a control and management circuit for actively replenishing power to compensate for low power and imbalance in multiple strings of cells. Background Technology

[0002] The battery cabinet, consisting of 2P84S lithium iron phosphate cells, operates at 268.8V. Due to space constraints and a three-layer battery layout, the control board and BMS board are located at the top of the cabinet for easy maintenance after disassembly. This places the cells inside the cabinet, meaning that when a cell is depleted, it needs to be recharged. Because the depleted cell is located in the inner layer, disassembly is difficult, making direct recharging challenging. Therefore, current-limited recharging is only possible through the voltage sampling line of the depleted cell, resulting in a slow and inefficient circuit. Summary of the Invention

[0003] To address the aforementioned technical issues, this application provides a control and management circuit with active power replenishment for multiple series of cells experiencing power loss and imbalance. Its purpose is to provide current-limited power replenishment to the battery when the system is intermittently not operating, and to directly charge the battery using the cells, thereby improving charging speed and efficiency.

[0004] This application provides a multi-cell battery cell depletion and imbalance active power replenishment control and management circuit, which adopts the following technical solution:

[0005] A control and management circuit for active power replenishment and imbalance control of multiple series of battery cells, comprising:

[0006] Multiple battery cells are connected in series, with orderly isolated control of the charging circuits between the multiple battery cells to charge the depleted battery cells in a time-sharing manner; the secondary windings of the charging circuits for the multiple battery cells are connected in parallel to each other.

[0007] Several first relays are evenly distributed on each string of cells to control the on / off state of the cell.

[0008] The charging module is electrically connected to the power input terminal and is used to convert the voltage at the power input terminal into the charging voltage and to convert AC into DC.

[0009] The main relay is located between the charging module and the multiple battery cells and is used to control the on / off state of all battery cells.

[0010] Preferably, each battery cell has a charging diode connected in series.

[0011] Preferably, each string of battery cells has two charging diodes, with the two diodes distributed on the charging input line and the charging output line, respectively.

[0012] Preferably, each of the first relays is connected to a control circuit, and the control circuit is equipped with a control switch.

[0013] Preferably, the control circuit is provided with a protection diode, which is connected in parallel with the first relay.

[0014] In summary, this application includes the following beneficial technical effects:

[0015] 1. This application can provide current-limited charging to the battery when the system is intermittently not working, and directly charge the battery using the battery cell, thereby improving the charging speed and charging efficiency.

[0016] 2. This application provides backflow prevention by placing a charging diode on the battery cell.

[0017] 3. This application provides a discharge circuit for the reverse electromotive force generated in the coil when the first relay is disconnected by setting a protection diode on the first relay, thereby protecting the electrical components on the first relay. Attached Figure Description

[0018] Figure 1 This is a circuit diagram of the power supply control circuit in the embodiments of this application.

[0019] Figure 2 This is a circuit diagram of voltage sampling in an embodiment of this application.

[0020] Explanation of reference numerals in the attached diagram: 1. Battery cell; 2. First relay; 3. Charging module; 4. Main relay; 5. Charging diode; 6. Control circuit; 61. Protection diode. Detailed Implementation

[0021] The present application will be further described in detail below with reference to the accompanying drawings.

[0022] This application discloses a circuit for actively replenishing power to control and manage multiple series of battery cells that are depleted or unbalanced.

[0023] Reference Figure 1 and Figure 2 The circuit with active power replenishment control and management for multiple battery cells with power loss and imbalance includes multiple battery cells 1, several first relays 2, a charging module 3 and a main relay 4, and several wires for connection.

[0024] The charging circuits between multiple strings of cells 1 are orderly isolated and controlled to charge multiple strings of depleted cells in a time-sharing manner; the secondary windings of the charging circuits of multiple strings of cells are connected in parallel to each other, and each string of cells 1 is directly electrically connected to a battery cell. In use, the voltage of the battery can be sampled through the group of cells 1, and the battery can also be charged through the group of cells 1.

[0025] Furthermore, each battery cell 1 can carry a unique number to facilitate subsequent control over whether the group of battery cells 1 is charged. In this embodiment, the cross-sectional area of ​​the end face of the battery cell 1 only needs to be able to withstand a circuit of 1A to 3A.

[0026] Reference Figure 1 Several first relays 2 are evenly distributed on all the battery cells 1. Each battery cell 1 is equipped with a first relay 2. The first relay 2 can control the on and off of the group of battery cells 1.

[0027] In order to facilitate charging of the battery through the battery cell 1, the battery cell 1 is also provided with a charging diode 5, and the number of charging diodes 5 can be set to two. The two charging diodes 5 are respectively distributed on the charging path and the charging circuit path of the battery cell 1. The two charging diodes 5 enable charging only into the battery and can play a role in preventing backflow.

[0028] Reference Figure 1 The charging module 3 is electrically connected to all the battery cells 1, and the charging module 3 is also electrically connected to the power input terminal. The power input terminal can be AC ​​mains power or DC power after the AC mains power has been converted. If the power input terminal is AC power, the charging module 3 can convert the AC power to DC power and convert the AC power voltage to a charging voltage that the battery can withstand. If the power input terminal is DC power, the charging module 3 can convert the DC power voltage to a charging voltage that the battery can withstand, so as to enable DC charging to the battery.

[0029] The main relay 4 is located between the charging module 3 and all the battery cells 1, and the main relay 4 is electrically connected to the charging module 3 and all the battery cells 1. By controlling the opening and closing of the main relay 4, the on and off of all the battery cells 1 can be controlled. The main relay 4 can be mechanically or electrically controlled.

[0030] In order to better charge the battery to which each group of cells 1 is located, the control terminal of the first relay 2 on each cell 1 is connected to the control circuit 6. When the control circuit 6 receives a high-level signal, the first relay 2 closes, so that the group of cells 1 can charge the battery to which it is electrically connected.

[0031] Reference Figure 1 and Figure 2The control circuit also includes a control module, which is electrically connected to all control circuits 6. The control module can be a microcontroller, and a control switch for each battery cell 1 is set on the microcontroller. During use, the battery containing the cell 1 can be manually charged based on the actual situation, or the battery's operating status can be monitored using a voltage sampling circuit or a current sampling circuit. When the battery voltage is detected to be lower than a set threshold voltage or current is detected to be lower than a set threshold current, the microcontroller can directly and automatically control the first relay 2 of the cell 1 to close, thereby allowing the cell 1 to charge the battery it is electrically connected to. Figure 2 It is a voltage sampling circuit, and it can sample 12 battery cells.

[0032] Reference Figure 1 In order to better protect the first relay 2, a protection diode 61 is also provided on the control circuit 6 of the first relay 2. The protection diode 61 is connected in parallel with the first relay 2, thereby providing a discharge circuit for the reverse electromotive force generated by the coil when the first relay 2 is disconnected, and thus protecting the electrical components on the first relay 2.

[0033] This application improves the traditional method of current-limiting battery charging by enabling direct charging of the battery through cell 1, which not only increases the charging speed but also improves the charging efficiency and shortens the charging time.

[0034] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A circuit with active power compensation control and management for multiple series of battery cells in case of power loss or imbalance, characterized in that, include: Multiple battery cells are connected in series, and the charging circuits between the multiple battery cells are orderly isolated and controlled to charge the multiple depleted battery cells in a time-sharing manner. The secondary windings of the multi-cell battery charging circuit are connected in parallel to each other. Several first relays are evenly distributed on each string of cells to control the on / off state of the cell. The charging module is electrically connected to the power input terminal and is used to convert the voltage at the power input terminal into the charging voltage and to convert AC into DC. The main relay is located between the charging module and the multiple battery cells and is used to control the on / off state of all battery cells.

2. The multi-cell battery cell depletion and imbalance active power replenishment control management circuit according to claim 1, characterized in that, Each battery cell has a charging diode connected in series.

3. A multi-cell battery cell depletion and imbalance active power replenishment control management circuit according to claim 2, characterized in that, Each battery cell has two charging diodes, which are distributed on the charging input line and the charging output line, respectively.

4. The multi-cell battery cell depletion and imbalance active power replenishment control management circuit according to claim 1, characterized in that, Each of the first relays is connected to a control circuit, and the control circuit is equipped with a control switch.

5. A multi-cell battery cell depletion and imbalance active power replenishment control management circuit according to claim 4, characterized in that, The control circuit is equipped with a protection diode, which is connected in parallel with the first relay.

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