Battery protection control device of household electricity storage device

Abstract

The utility model provides a battery protection control device of a household electricity storage device. The battery protection control device comprises a main voltage acquisition module, a master control MCU module and an active equalization module. The main voltage acquisition module acquires a single cell voltage of an energy storage battery to obtain a first single cell voltage, and the other end of the main voltage acquisition module is connected with the main control MCU module to output the first single cell voltage; the active equalization module comprises a secondary voltage acquisition module, an active equalization circuit and an equalization control circuit, the secondary voltage acquisition module acquires a single cell voltage of the energy storage battery to obtain a second single cell voltage, and the other end of the secondary voltage acquisition module is connected with the equalization control circuit to output the second single cell voltage; the equalization control circuit receives the voltage of the second single cell, controls the active equalization circuit to act, and transmits the received voltage of the second single cell to the main control MCU module during equalization; the master control MCU module receives the second single cell voltage transmitted by the active equalization circuit and the first single cell voltage transmitted by the main voltage acquisition module. The voltage acquisition device is accurate in voltage acquisition.

Description

Technical Field

[0001] The utility model relates to new energy, in particular to the equalization protection of energy storage batteries. Background Art

[0002] The passive equalization function of traditional household energy storage protection boards has low efficiency, small current, and long time. Therefore, many people choose to externally connect an active equalization module for equalization. Although this externally connected equalization device can achieve the effect of active equalization, its function is single. When used together with the protection board, the overall volume will be very large. Moreover, the voltage acquisition of the protection board only relies on the AFE module for acquisition, and the voltage acquisition accuracy is not high. Especially during active equalization, the sampling line will carry a 1A equalization current, and then according to Ohm's law V = IR, a voltage drop will be generated on the acquisition line, resulting in deviation of the acquisition voltage data of the protection board.

[0003] Therefore, there is an urgent need for a new type of household energy storage protection board that can solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a battery protection control device for a household power storage device with accurate voltage acquisition.

[0005] To achieve the above purpose, the utility model provides a battery protection control device for a household power storage device, including a main voltage acquisition module, a main control MCU module, and an active equalization module; one end of the main voltage acquisition module is connected to an energy storage battery to acquire the single-cell voltage of the energy storage battery to obtain a first single-cell voltage, and the other end is connected to the main control MCU module to output the acquired first single-cell voltage to the main control MCU module; the active equalization module includes a secondary voltage acquisition module, an active equalization circuit, and an equalization control circuit. One end of the secondary voltage acquisition module is connected to the energy storage battery to acquire the single-cell voltage of the energy storage battery to obtain a second single-cell voltage, and the other end is connected to the equalization control circuit to output the acquired second single-cell voltage to the equalization control circuit. The equalization control circuit receives the second single-cell voltage and controls the active equalization circuit to perform an equalization action, and conveys the received second single-cell voltage to the main control MCU module during equalization; the main control MCU module receives the second single-cell voltage conveyed by the active equalization circuit and the first single-cell voltage conveyed by the main voltage acquisition module.

[0006] Preferably, the main control MCU module uses the second single-cell voltage for monitoring during active equalization and uses the first single-cell voltage for monitoring when active equalization stops, overcoming the influence brought by the voltage drop generated on the acquisition line during active equalization.

[0007] Preferably, the main control MCU module is also connected to the switch circuit of the power supply circuit of the active equalization circuit to control the on / off of the power supply circuit, and this solution enables the active equalization module to be controlled by the main control MCU module.

[0008] Specifically, there is an optoelectronic isolation switch circuit between the first output terminal of the main control MCU module and the control terminal of the switch circuit. The first output terminal outputs corresponding high and low levels to control the on / off of the switch circuit, so that the active equalization circuit starts or stops the equalization work. This solution enables the main control MCU module to control the opening and closing of the active equalization module, and the isolation control has strong anti-interference ability.

[0009] More specifically, the main control MCU module is also communicatively connected to the equalization control circuit, and controls the disconnection of the power supply circuit when the equalization control circuit is out of contact or has a communication failure. This can not only improve the overall equalization efficiency, but also effectively reduce the overall sleep power consumption, and can understand the working conditions of the original protection board (main control MCU module) and the active equalization module in real time, improving the safety and stability of the product.

[0010] More specifically, the main control MCU module controls the disconnection of the power supply circuit during sleep, so that the active equalization module is powered off, reducing the sleep power loss.

[0011] Preferably, the battery protection control device further includes an input channel module and a line sequence detection module. One end of the input channel module is connected to the single cell of the energy storage battery, and the other end is selectively switched to the secondary voltage acquisition module and the line sequence detection module. The bidirectional DC / DC module of the active equalization circuit is connected to the energy storage battery through the input channel module. This solution performs channel switching through the input channel module.

[0012] Specifically, the battery protection control device further includes a positive-negative switching module. The line sequence detection module receives the voltage signals of the single battery cells, compares the positive and negative signals at both ends of each single battery cell to output a detection signal. The positive-negative switching module includes a switch switching circuit. The input end of the switch switching circuit receives the positive and negative signals of the single battery cell, and the output end is connected to the positive input end and the negative input end of the secondary voltage acquisition module. The input end of the positive-negative switching module is connected to the detection signal, and controls the conduction path of the switch switching circuit according to the detection signal. When the positive signal of the single battery cell is greater than the negative signal, it controls the positive signal to conduct to the positive input end and the negative signal to conduct to the negative input end. When the negative signal of the single battery cell is greater than the positive signal, it controls the positive signal to conduct to the negative input end and the negative signal to conduct to the positive input end. The secondary voltage acquisition module acquires the voltage difference input by the positive-negative switching module to obtain the sampling voltage of the single battery cell. This solution can continue to detect the effective voltage of the single battery cell when there is a wire harness reverse connection between the single battery cell of the energy storage battery and the input channel module.

[0013] Preferably, the active balancing module is installed on the balancing circuit board, the main control MCU module and the main voltage acquisition module are installed on the home energy storage protection board, and the balancing circuit board and the home energy storage protection board are electrically connected together through a pair of socket sub-boards for communication connection, power supply, enabling and common grounding. This solution enables a compatible overlay design between the active balancing module and the original home energy storage protection board, with a smaller volume, stronger relevance, and stronger anti-interference ability.

[0014] Compared with the prior art, the present utility model adopts a working mode of dual-channel voltage acquisition. The main control MCU module receives the voltage of the second single battery cell delivered by the active balancing circuit and the voltage of the first single battery cell delivered by the main voltage acquisition module, making the obtained voltage data more accurate. Description of the Drawings

[0015] Figure 1 is a structural diagram of the battery protection control device of the home energy storage device of the present utility model in one embodiment.

[0016] Figure 2 is a structural diagram of the battery protection control device of the home energy storage device of the present utility model in another embodiment.

[0017] Figure 3 is a partial circuit diagram of the battery protection control device of the home energy storage device of the present utility model.

[0018] Figure 4 is a circuit diagram of the switch circuit in the battery protection control device of the home energy storage device of the present utility model. Detailed implementation manners

[0019] To describe in detail the technical content, structural features, achieved objectives and effects of the present utility model, the following will be described in detail in conjunction with the implementation manners and with reference to the drawings.

[0020] Referring to Figure 1 , the present utility model discloses a battery protection control device 100 for a household electricity storage device, which includes a main voltage acquisition module 21, a main control MCU module 22 and an active equalization module 30; one end of the main voltage acquisition module 21 is connected to the energy storage battery 10 to collect the single-cell voltage of the energy storage battery 10 to obtain the first single-cell voltage, and the other end is connected to the main control MCU module 22 to output the collected first single-cell voltage to the main control MCU module 22; the active equalization module 30 includes a secondary voltage acquisition module 31, an active equalization circuit 33 and an equalization control circuit 32. One end of the secondary voltage acquisition module 31 is connected to the energy storage battery 10 to collect the single-cell voltage of the energy storage battery 10 to obtain the second single-cell voltage, and the other end is connected to the equalization control circuit 32 to output the collected second single-cell voltage to the equalization control circuit 32. The equalization control circuit 32 receives the second single-cell voltage and controls the active equalization circuit 33 to perform an equalization action, and conveys the received second single-cell voltage to the main control MCU module 22 during equalization; the main control MCU module 22 receives the second single-cell voltage conveyed by the active equalization circuit 33 and the first single-cell voltage conveyed by the main voltage acquisition module 21. Among them, the energy storage battery 10 is the battery of the household electricity storage device.

[0021] Referring to Figure 1 and Figure 2 , the main control MCU module 22 uses the second single-cell voltage for monitoring during active equalization, and uses the first single-cell voltage for monitoring when active equalization stops, overcoming the influence brought by the voltage drop generated by the acquisition line during active equalization.

[0022] Referring to Figure 3 , a switch circuit 52 is connected in series to the power supply loop of the active equalization circuit 33. The main control MCU module 22 is also connected to the switch circuit 52 of the power supply loop of the active equalization circuit 33 to control the on / off of the power supply loop. This solution enables the active equalization module 30 to be controlled by the main control MCU module 22. A power supply circuit is connected in series to the power supply loop. The power supply circuit includes a control chip, a peripheral circuit and a DC / DC conversion module.

[0023] Specifically, there is an optoelectronic isolation switch circuit 51 between the first output terminal of the main control MCU module 22 and the control terminal of the switch circuit 52. The first output terminal outputs corresponding high and low levels to control the on / off of the switch circuit 52, so that the active equalization circuit 33 starts or stops the equalization operation. This solution enables the main control MCU module 22 to control the opening and closing of the active equalization module 30, and the isolation control has strong anti-interference ability. Refer to Figure 3 , the optoelectronic isolation switch circuit 51 includes an optoelectronic isolator U1, a resistor R1, and a resistor R2. The resistor R1 and the resistor R2 are connected in series between the first output terminal of the MCU control module 22 and the ground. The primary side of the optoelectronic isolator U1 is connected between the node between the resistor R1 and the resistor R2 and the ground. The secondary side of the optoelectronic isolator U1 is connected between the control terminal of the switch circuit 52 and a preset voltage (preset reference voltage or ground). The main circuit of the switch circuit 52 is connected in series on the power supply loop of the active equalization circuit 33. In this embodiment, the positive pole of the secondary side of the optoelectronic isolator U1 forms an output point A connected to the control terminal of the switch circuit 52, and the negative pole side is grounded, so that when the optoelectronic isolator U1 is turned on, the output point A outputs 0 voltage (low level).

[0024] Refer to Figure 4 , the switch circuit 52 is connected in series between the reference voltage VDD and the power supply terminal of the active equalization module 30, and includes a resistor R3, a resistor R4, a switching transistor Q1, a resistor R5, a zener diode ZD1, and a filter circuit composed of capacitors C1, C2, C3, and C4. The resistor R3 and the switching transistor Q1 are connected in series between the reference voltage VDD and the power supply terminal of the active equalization module 30. The zener diode ZD1 and the resistor R4 are connected in parallel and then connected in series between the gate (i.e., the control terminal) and the source of the switching transistor Q1. The gate of the switching transistor Q1 is connected to the output point A through the resistor R5.

[0025] Refer to Figure 4 , the first control terminal of the main control MCU module 22 outputs a control signal of corresponding high and low levels (outputs a high level in this embodiment). This control signal reaches the output point A through the optoelectronic isolation switch circuit 51, so that the output point A outputs corresponding high and low levels (in this embodiment, the switching transistor Q1 is driven to conduct by a low level, so the output terminal A outputs a low level at this time). The switching transistor Q1 conducts, and the power supply circuit of the active equalization module 30 has a total voltage input, and the active equalization module 30 is turned on. On the contrary, when the first control terminal of the main control MCU module 22 outputs a low level, the output point A does not output a signal, the switching transistor Q1 does not conduct, the power supply circuit of the active equalization module 30 has no voltage input, and the active equalization module 30 cannot be turned on.

[0026] Refer to Figure 1 and Figure 2, the main control MCU module 22 is also communicatively connected to the equalization control circuit 32, and controls the power supply circuit to disconnect when the equalization control circuit 32 is out of contact or has a communication failure, which can not only improve the overall equalization efficiency, but also effectively reduce the overall sleep power consumption, and can understand the working conditions of the original protection board (main control MCU module 22) and the active equalization module 30 in real time, improving the safety and stability of the product.

[0027] Preferably, the battery protection control device 100 further includes an input channel module 41 and a line sequence detection module 42. One end of the input channel module 41 is connected to the single cell of the energy storage battery 10, and the other end is selectively switched to the secondary voltage acquisition module 31 and the line sequence detection module 42. The bidirectional DC / DC module 331 of the active equalization circuit 33 is connected to the energy storage battery 10 through the input channel module 41. This solution performs channel switching through the input channel module 41.

[0028] Specifically, the battery protection control device 100 further includes a positive and negative switching module 311. The line sequence detection module 42 receives the voltage signal of the single cell, compares the positive signal and the negative signal at both ends of each single cell to output a detection signal; the positive and negative switching module 311 includes a switch switching circuit. The input end of the switch switching circuit is connected to the output end of the input channel module 41 to receive the positive signal and the negative signal of the single cell, and the output end is connected to the positive input end and the negative input end of the secondary voltage acquisition module 31. The input end of the positive and negative switching module 311 is connected to the detection signal, and controls the conduction path of the switch switching circuit according to the detection signal. When the positive signal of the single cell is greater than the negative signal, it controls the positive signal to conduct to the positive input end and the negative signal to conduct to the negative input end. When the negative signal of the single cell is greater than the positive signal, it controls the positive signal to conduct to the negative input end and the negative signal to conduct to the positive input end. The secondary voltage acquisition module acquires the voltage difference input by the positive and negative switching module 311 to obtain the sampling voltage of the single cell. This solution can continue to detect the effective voltage of the single cell when the wire harness between the single cell of the energy storage battery 10 and the input channel module 41 is reversely connected.

[0029] Among them, the active equalization module 30 is installed on the equalization circuit board, the main control MCU module 22 and the main voltage acquisition module 21 are installed on the home energy storage protection board 20, and the equalization circuit board and the home energy storage protection board 20 are electrically connected together through a pair of sockets for communication connection, power supply, enabling and common grounding. This solution enables a compatible stacking design between the active equalization module 30 and the original home energy storage protection board, with a smaller volume, stronger correlation, and stronger anti-interference ability.

[0030] In this embodiment, the main control MCU module 22 also directly controls the power-down of the active balancing module 30 during dormancy, with almost no power consumption generated, thereby reducing the dormancy power consumption of the battery protection control device.

[0031] The above-disclosed are only the preferred embodiments of the present invention, and of course, the scope of rights of the present invention cannot be limited thereby. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A battery protection control device for a household power storage device, characterized in that: It includes main voltage acquisition module, main control MCU module and active balancing module; One end of the main voltage acquisition module is connected to the energy storage battery to acquire the single cell voltage of the energy storage battery to obtain the first single cell voltage, and the other end is connected to the main control MCU module to output the acquired first single cell voltage to the main control MCU module; The active balancing module includes a secondary voltage acquisition module, an active balancing circuit and a balancing control circuit. One end of the secondary voltage acquisition module is connected to the energy storage battery to collect the single cell voltage of the energy storage battery to obtain the second single cell voltage, and the other end is connected to the balancing control circuit to output the collected second single cell voltage to the balancing control circuit. The balancing control circuit receives the second single cell voltage and controls the active balancing circuit to perform balancing action, and transmits the received second single cell voltage to the main control MCU module during balancing. The main control MCU module receives the second single cell voltage transmitted by the active balancing circuit and the first single cell voltage transmitted by the main voltage acquisition module.

2. The battery protection control device according to claim 1, characterized in that: The main control MCU module uses the second single cell voltage for monitoring during active balancing, and uses the first single cell voltage for monitoring when active balancing is stopped.

3. The battery protection control device according to claim 1, characterized in that: The main control MCU module is also connected to the switch circuit of the power supply circuit of the active balancing circuit to control the on-off of the power supply circuit.

4. The battery protection control device according to claim 3, characterized in that An optoelectronic isolation switch circuit is provided between the first output end of the main control MCU module and the control end of the switch circuit. The first output end outputs corresponding high and low levels to control the on and off of the switch circuit so that the active balancing circuit starts or stops balancing work.

5. The battery protection control device according to claim 4, characterized in that: The main control MCU module is also connected to the balancing control circuit for communication, and controls the power supply circuit to be disconnected when the balancing control circuit loses connection or a communication failure occurs.

6. The battery protection control device according to claim 4, characterized in that: The main control MCU module controls the power supply circuit to be disconnected when in sleep mode.

7. The battery protection control device according to claim 1, characterized in that: It also includes an input channel module and a line sequence detection module. One end of the input channel module is connected to the single cell of the energy storage battery, and the other end is selectively switched to the secondary voltage acquisition module and the line sequence detection module. The bidirectional DC / DC module of the active balancing circuit is connected to the energy storage battery through the input channel module.

8. The battery protection control device according to claim 7, characterized in that: It also includes a positive and negative switching module, the line sequence detection module receives the voltage signal of the single cell, compares the positive signal and the negative signal at both ends of each single cell to output a detection signal; the positive and negative switching module includes a switch switching circuit, the input end of the switch switching circuit receives the positive signal and the negative signal of the single cell, and the output end is connected to the positive input end and the negative input end of the secondary voltage acquisition module, the input end of the positive and negative switching module is connected to the detection signal, and the conduction path of the switch switching circuit is controlled according to the detection signal. When the positive signal of the single cell is greater than the negative signal, the positive signal is controlled to be conducted to the positive input end and the negative signal is conducted to the negative input end. When the negative signal of the single cell is greater than the positive signal, the positive signal is controlled to be conducted to the negative input end and the negative signal is conducted to the positive input end. The secondary voltage acquisition module collects the voltage difference input by the positive and negative switching module to obtain the sampled voltage of the single cell.

9. The battery protection control device according to claim 1, characterized in that: The active balancing module is installed on the balancing circuit board, the main control MCU module and the main voltage acquisition module are installed on the home storage protection board, and the balancing circuit board and the home storage protection board are electrically connected together through a socket for communication connection, power supply, enabling and common grounding.

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