Battery control device and battery system

Abstract

The application relates to a battery control device and a battery system, which comprise a battery management system, an active balancing system and a selection device, one side of the battery management system is connected to the output side of the selection device, the other side is used for connecting a battery, the first input side of the selection device is used for connecting the battery, the second input side of the selection device is connected to the first output side of the active balancing system, the first input side of the active balancing system is used for connecting a charging device and is used for charging and balancing the power cells in the battery, the second input side of the active balancing system is connected to the battery management system, the second output side of the active balancing system is used for connecting the battery, and the selection device transmits the power from the active balancing system to the battery management system when receiving the power from the active balancing system. The application avoids the situation that the battery is charged and discharged at the same time when the power from the battery is taken during the working of the active balancing system, unnecessary power waste is avoided, the balancing efficiency is improved, and the application is reliable.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery control device and battery system. Background Technology

[0002] With global oil resources becoming increasingly scarce, it is imperative to find a new energy source to gradually replace fossil fuels. Lithium-ion batteries, as the most popular alternative energy source, have rapidly penetrated various industries. However, with the rapid promotion and application of lithium-ion batteries, some problems have also been discovered. For example, battery packs composed of hundreds or thousands of lithium-ion cells suffer from inconsistency among the cells. The longer the battery pack is used, the worse the consistency becomes, which seriously affects the lifespan of the battery pack.

[0003] To address the issue of inconsistent cell capacity at the battery pack level, the traditional method of cell capacity balancing involves connecting a resistor in parallel next to each cell. When charging or stationary, the resistor is activated, consuming the capacity of higher-capacity cells to bring them closer to the capacity of lower-capacity cells, thus achieving a uniform capacity across all cells. However, this method results in unnecessary energy waste and low balancing efficiency. Summary of the Invention

[0004] Therefore, it is necessary to provide a battery control device and battery system to address the problems of unnecessary power waste and poor working efficiency caused by traditional cell power balancing methods.

[0005] A battery control device includes a battery management system, an active balancing system, and a selection device. One side of the battery management system is connected to the output side of the selection device, and the other side is used to connect to a battery. A first input side of the selection device is used to connect to the battery, and a second input side of the selection device is connected to the first output side of the active balancing system. The first input side of the active balancing system is used to connect to a charging device for charging and balancing the cells in the battery. The second input side of the active balancing system is connected to the battery management system, and the second output side of the active balancing system is used to connect to the battery.

[0006] When the selection device receives electrical energy from the active balancing system, it transmits the electrical energy from the active balancing system to the battery management system.

[0007] In one embodiment, the selection device includes a selection chip, a switching circuit, and an output selection circuit;

[0008] The first input terminal of the selection chip is used to connect to the battery, the second input terminal of the selection chip is connected to the first output side of the active balancing system, the output terminal of the selection chip is connected to the switching circuit, the switching circuit is connected to the output selection circuit, the first input terminal of the output selection circuit is connected to the battery through the switching circuit, the second input terminal of the output selection circuit is connected to the first output side of the active balancing system, and the output terminal of the output selection circuit is connected to the battery management system.

[0009] In one embodiment, the output selection circuit includes a first diode and a second diode, the anode of the first diode being connected to the battery via the switching circuit, the anode of the second diode being connected to the first output side of the active balancing system, and the cathodes of both the first diode and the second diode being connected to the battery management system.

[0010] In one embodiment, the selection device further includes a power control circuit, the input of which is connected to the battery, and the output of which is connected to the power port of the selection chip.

[0011] In one embodiment, the selection device further includes an input selection circuit, a first input terminal of which is connected to the output terminal of the power control circuit, a second input terminal of which is connected to the first output side of the active equalization system, and an output terminal of which is connected to the second input terminal of the selection chip.

[0012] In one embodiment, the selection device further includes a first input voltage divider circuit, and a first input terminal of the selection chip is used to connect to a battery through the first input voltage divider circuit.

[0013] In one embodiment, the selection device further includes a second input voltage divider circuit, and the first output side of the active equalization system is connected to the second input terminal of the selection chip through the second input voltage divider circuit.

[0014] In one embodiment, the battery management system includes a DC-DC converter, a first linear regulator, a first controller, and a battery sampling chip. The output side of the selection device is connected to the DC-DC converter, the DC-DC converter is connected to the first linear regulator, the first linear regulator is connected to the first controller, the first controller is connected to the battery sampling chip, the battery sampling chip is connected to a connection for the battery, and the DC-DC converter is connected to the second input side of the active balancing system.

[0015] In one embodiment, the active balancing system includes an isolated charging power supply, a second linear regulator, a second controller, and a balancing switch. The second linear regulator is connected to the battery management system and also to the second controller. The second controller is connected to the balancing switch. The input side of the isolated charging power supply is used to connect to a charging device. The first output side of the isolated charging power supply is connected to the balancing switch. The second output side of the isolated charging power supply is connected to the selection device. The balancing switch is used to connect to the battery.

[0016] A battery system includes a battery and a battery control device as described above.

[0017] The aforementioned battery control device and battery system include a battery management system, an active balancing system, and a selection device. One side of the battery management system is connected to the output side of the selection device, and the other side is used to connect to the battery. The first input side of the selection device is used to connect to the battery, and the second input side of the selection device is connected to the first output side of the active balancing system. The first input side of the active balancing system is used to connect to a charging device for charging and balancing the battery cells. The second input side of the active balancing system is connected to the battery management system, and the second output side of the active balancing system is used to connect to the battery. When the selection device receives power from the active balancing system, it transmits the power from the active balancing system to the battery management system. The battery management system can optimize battery performance, and the active balancing system can charge and balance the battery cells with good balancing effect. Furthermore, when the selection device receives power from the active balancing system (i.e., when the active balancing system is connected to a charging device), it transmits the power from the active balancing system to the battery management system, ensuring that both the battery management system and the active balancing system draw power from the charging device. This avoids the situation where the active balancing system draws power from the battery during operation, causing the battery to charge and discharge simultaneously, thus preventing unnecessary power waste, improving balancing efficiency, and ensuring reliable operation. Attached Figure Description

[0018] Figure 1 This is a structural block diagram of the battery control device in one embodiment;

[0019] Figure 2 This is a schematic diagram of the battery control device in one embodiment;

[0020] Figure 3 This is a schematic diagram of the power control circuit in one embodiment;

[0021] Figure 4 This is a block diagram of a battery system in one embodiment. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0023] In one embodiment, see Figure 1 A battery control device is provided for controlling a battery 20. The battery 20 may include two or more battery cells. The installation method of the battery cells in the battery 20 is not unique. In this embodiment, the battery 20 includes two or more stacked cell layers, each containing two or more battery cells connected in series and parallel in an orderly arrangement. Each cell layer also includes a first cell support and a second cell support, which are disposed opposite each other on the upper and lower sides of the cell layer to fix the position of each cell. The left and right sides of the cell layer are the extension directions of the battery cells. It is understood that in other embodiments, the battery cells in the battery 20 may be arranged in other ways, as long as those skilled in the art believe it is feasible. The battery control device can be integrated with the battery 20 into a housing to form a battery pack. The battery pack has rich functions, and the housing can also provide protection for the battery 20 and the battery control device, extending the service life of the components inside the housing.

[0024] In this embodiment, the battery control device includes a battery management system 200, an active balancing system 300, and a selection device 100. One side of the battery management system 200 is connected to the output side of the selection device 100, and the other side is used to connect to the battery 20. The first input side of the selection device 100 is used to connect to the battery 20, and the second input side of the selection device 100 is connected to the first output side of the active balancing system 300. The first input side of the active balancing system 300 is used to connect to a charging device for charging and balancing the cells in the battery 20. The second input side of the active balancing system 300 is connected to the battery management system 200, and the second output side of the active balancing system 300 is used to connect to the battery 20. When the selection device 100 receives electrical energy from the active balancing system 300, it transmits the electrical energy from the active balancing system 300 to the battery management system 200. The battery management system 200 can optimize the performance of the battery 20, and the active balancing system 300 can perform charging balancing on the cells in the battery 20. The balancing effect is good. When the selection device 100 receives power from the active balancing system 300, that is, when the active balancing system 300 is connected to the charging equipment, it transfers the power from the active balancing system 300 to the battery management system 200. This ensures that both the battery management system 200 and the active balancing system 300 draw power from the charging equipment, avoiding the situation where the active balancing system 300 draws power from the battery 20 while it is charging and discharging simultaneously. This avoids unnecessary power waste, improves balancing efficiency, and ensures reliable use.

[0025] Specifically, the battery management system 200 is connected to the output side of the selection device 100 on one side and to the battery 20 on the other. The battery management system 200 draws power from the output side of the selection device 100 and manages the battery 20 during operation. Depending on the structure of the battery management system 200, its functions may vary. For example, the battery management system 200 can monitor parameters such as voltage, current, and temperature of the battery 20 and take timely measures to improve the performance of the battery 20 when abnormalities occur. It is understood that in other embodiments, the battery management system 200 may also implement other functions, which can be configured according to actual needs.

[0026] The first input side of the active balancing system 300 is connected to a charging device for charging and balancing the cells in the battery 20. The second input side of the active balancing system 300 is connected to the battery management system 200, meaning the active balancing system 300 can draw power from either the charging device or the battery management system 200. When the active balancing system 300 draws power from the battery management system 200, it typically draws power from the DC-DC converter (DCDC) within the battery management system 200. Furthermore, the first output side of the active balancing system 300 is connected to the second input side of the selection device 100, and the second output side of the active balancing system 300 is connected to the battery 20. The active balancing system 300 can supply power to both the selection device 100 and the battery 20.

[0027] The principle of the active balancing system 300 in charging and balancing the cells in the battery 20 includes: the active balancing system 300 connects to the cells in the battery 20, and when a trigger condition is met, it charges the cells to balance the charge of each cell. Specifically, the trigger condition can be the operating time; after detecting that the battery 20 has operated for a preset time, the active balancing system 300 replenishes the charge of each cell in a timely manner. Alternatively, the trigger condition can also be the voltage of each cell in the battery 20. For example, the battery management system 200 can detect the voltage of each cell in the battery 20 and send it to the main control balancing device. When the active balancing system 300 detects that there are cells in the battery 20 with voltage values ​​lower than a preset voltage threshold, it charges these cells to make their voltage values ​​consistent with other cells or reach the target voltage value. Alternatively, when the active balancing system 300 detects that the difference between the cells in the battery 20 is greater than the difference threshold, it charges each cell in the battery 20 to make the voltage of each cell reach the target voltage value, thereby maintaining the consistency of the cells in the battery 20 and improving the working performance of the battery 20. It is understood that in other embodiments, the charging balancing mechanism of the active balancing system 300 for the cells in the battery 20 may also be other, as long as those skilled in the art believe it is feasible.

[0028] The first input side of the selection device 100 is connected to the battery 20, the second input side of the selection device 100 is connected to the first output side of the active balancing system 300, and the output side of the selection device 100 is connected to the battery management system 200. The selection device 100 can draw power from either the battery 20 or the active balancing system 300, and then transmits the power to the battery management system 200 for its operation. Because of the second input side of the active balancing system 300, when the battery management system 200 receives power, the active balancing system 300 can also draw power from the battery management system 200 to operate normally.

[0029] When the selection device 100 receives electrical energy from the active balancing system 300, it considers that the active balancing system 300 is connected to a charging device, is about to start or is already in operation, and has transferred electrical energy to the selection device 100. At this time, the electrical energy from the active balancing system 300 is transferred to the battery management system 200, and the charging device supplies power to the battery management system 200, ensuring that both the battery management system 200 and the active balancing system 300 draw their operating power from the charging device. Simultaneously, the selection device 100 does not draw power from the battery 20, thus preventing the cells in the battery 20 from being in a state of simultaneous charging and discharging while the active balancing system 300 is charging the battery 20. If the cells in the battery 20 are in a state of simultaneous charging and discharging, the balancing efficiency is low, and when charging subsequent cells, the preceding cells have already discharged some charge, leading to new inconsistencies and poor balancing results. Therefore, by using a battery control device, the balancing effect of the active balancing system 300 on the battery 20 can be guaranteed, thereby improving the working performance of the battery 20.

[0030] In one embodiment, see Figure 2 The selection device 100 includes a selection chip U2, a switching circuit 110, and an output selection circuit 120. The first input terminal IN+ of the selection chip U2 is connected to the battery 20, and the second input terminal IN- of the selection chip U2 is connected to the first output side of the active balancing system 300. The output terminal of the selection chip U2 is connected to the switching circuit 110, and the switching circuit 110 is connected to the output selection circuit 120. The first input terminal of the output selection circuit 120 is connected to the battery 20 through the switching circuit 110, and the second input terminal of the output selection circuit 120 is connected to the first output side of the active balancing system 300. The output terminal of the output selection circuit 120 is connected to the battery management system 200.

[0031] Specifically, the first input terminal IN+ of the selection chip U2 is connected to the battery 20, the second input terminal IN- of the selection chip U2 is connected to the first output side of the active balancing system 300, and the output terminal of the selection chip U2 is connected to the switching circuit 110. The selection chip U2 can output different signals to the switching circuit 110 based on the different amounts of electrical energy received at the first and second input terminals, controlling the switching circuit 110 to turn on or off. The selection chip U2 can also be a comparator, sending a high or low level signal to the switching circuit 110 based on the relative magnitudes of the first and second input terminals, controlling the switching circuit to turn on or off. The switching circuit 110 is connected to the output selection circuit 120, and the first input terminal of the output selection circuit 120 is connected to the battery 20 via the switching circuit 110. Therefore, whether the switching circuit 110 is on or off directly affects whether the first input terminal of the output selection circuit 120 can successfully receive electrical energy from the battery 20. The second input terminal of the output selection circuit 120 is connected to the first output side of the active balancing system 300, and the output terminal of the output selection circuit 120 is connected to the battery management system 200. When the output selection circuit 120 receives power from both the battery 20 and the active balancing system 300 simultaneously, it selects one of them to output to the battery management system 200. When the output selection circuit 120 receives only power from the active balancing system 300, it transmits the power from the charging device connected to the active balancing system 300 to the battery management system 200, enabling both the battery management system 200 and the active balancing system 300 to operate, thus completing the output selection function.

[0032] In one embodiment, see Figure 2 The output selection circuit 120 includes a first diode D9 and a second diode D8. The anode of the first diode D9 is connected to the battery 20 through the switching circuit 110. The anode of the second diode D8 is connected to the first output side of the active balancing system 300. The cathodes of the first diode D9 and the second diode D8 are both connected to the battery management system 200.

[0033] Specifically, when the switching circuit 110 is open, the anode of the first diode D9 cannot draw power from the battery 20 through the switching circuit 110. If the anode of the second diode D8 can draw power from the active balancing system 300, the output selection circuit 120 outputs the output of the cathode of the second diode D8. The power output from the active balancing system 300 is then output to the battery management system 200 after the voltage drop across the second diode D8. When the switching circuit 110 is closed, the anode of the first diode D9 can draw power from the battery 20 through the switching circuit 110. If the anode of the second diode D8 cannot draw power from the active balancing system 300, the output selection circuit 120 outputs the output of the cathode of the first diode D9. The power output from the battery 20 is then output to the battery management system 200 after the voltage drop across the first diode D9. When the switching circuit 110 is turned on, if the anode of the second diode D8 can draw power from the active equalization system 300, the output of the output selection circuit 120 is the larger of the output of the cathode of the first diode D9 and the output of the cathode of the second diode D8. That is, it selects one output from the power source from the active equalization system 300 and the power source from the battery 20, thus realizing the output selection function.

[0034] Further, please see Figure 2 The switching circuit 110 may include switching transistors Q6 and Q7, and a switching auxiliary circuit. The output terminal of the selection chip U2 is connected to the control terminal of switching transistor Q6. The second terminal of switching transistor Q6 is connected to the negative terminal of battery 20. The first terminal of switching transistor Q6 is connected to the control terminal of switching transistor Q7. The first terminal of switching transistor Q7 is used to connect to the positive terminal of battery 20, and the second terminal of switching transistor Q7 is connected to the anode of the first diode. In one embodiment, when the output terminal of the selection chip U2 outputs a high level to the control terminal of switching transistor Q6, the high level turns on switching transistor Q6, which in turn turns on switching transistor Q7, allowing the positive terminal of battery 20 to output electrical energy to the anode of the second diode D8. The peripheral circuit is used to cooperate with the operation of switching transistors Q6 and Q7 to improve circuit performance. In this embodiment, the switching auxiliary circuit includes resistors R12, R16, R17, R18, and R19, capacitor C5, Zener diode D6, and ferrite bead FB1. The specific connection relationships of these devices are clear from the accompanying drawings and will not be described in detail here.

[0035] In one embodiment, see Figure 3The selection device 100 also includes a power control circuit 130. The input terminal of the power control circuit 130 is connected to the battery 20, and the output terminal is connected to the power port of the selection chip U2. After receiving electrical energy from the battery 20, the power control circuit 130 processes the received energy and transmits it to the power port of the selection chip U2 through its output terminal, thus powering the selection chip U2 and improving the quality of the power received by the selection chip U2, which is beneficial to improving the working performance of the selection chip U2. The structure of the power control circuit 130 is not unique. In this embodiment, the power control circuit 130 includes a linear regulator U1 and peripheral circuitry. The linear regulator U1 can linearly regulate the input electrical energy before outputting it, and the peripheral circuitry works in conjunction with the linear regulator U1 to ensure the working performance of the linear regulator U1.

[0036] In this embodiment, please refer to Figure 3 The peripheral circuit includes resistors R1, R2, R3, and R4; switching transistors Q1 and Q2; Zener diodes D1, D2, and D3; and capacitors C1 and C2. The anode of Zener diode D1 is connected to the negative terminal of battery 20, and the cathode of Zener diode D1 is connected to the positive terminal of battery 20 via resistors R2 and R1. The control terminal of switching transistor Q1 is connected to the common terminal of Zener diode D1 and resistor R2. The first terminal of switching transistor Q1 is connected to the common terminal of resistors R1 and R2, and the second terminal of switching transistor Q1 is connected to the control terminal of switching transistor Q2. The first end of transistor Q2 is connected to the common terminal of resistors R1 and R2. The second end of transistor Q2 is connected to the input terminal of linear regulator U1 through resistors R3 and R4 in sequence. Capacitor C1 is connected in parallel with Zener diode D2. The anode of Zener diode D2 is connected to the negative terminal of battery 20. The cathode of Zener diode D2 is connected to the common terminal of resistors R3 and R4. Capacitor C2 is connected in parallel with Zener diode D3. The anode of Zener diode D3 is connected to the negative terminal of battery 20. The cathode of Zener diode D3 is connected to the output terminal of linear regulator U1. The output terminal of linear regulator U1 is also connected to the power port of select chip U2. After the port at resistor R1 receives power from the positive terminal of battery 20, the voltage output from the positive terminal of battery 20 passes through switching transistors Q1 and Q2 and Zener diode D1, and the voltage at resistor R4 is generally 12V. After being processed by linear regulator U1, a voltage of 3.3V is output through the output terminal of linear regulator U1 to the power port of selector chip U2, so that selector chip U2 can work normally.

[0037] In one embodiment, see Figure 2The selection device 100 also includes an input selection circuit 140. The first input terminal of the input selection circuit 140 is connected to the output terminal of the power control circuit 130, the second input terminal of the input selection circuit 140 is connected to the first output side of the active equalization system 300, and the output terminal of the input selection circuit 140 is connected to the second input terminal IN- of the selection chip U2.

[0038] Specifically, the input selection circuit 140 can receive power from the output of the power control circuit 130 and processed power from the battery 20 through its first input terminal, and power from the active balancing system 300 through its second input terminal. When power is received at both the first and second input terminals, the input selection circuit 140 selects one of them and transmits the received power to the second input terminal IN- of the selection chip U2. When power is received at only one of the first and second input terminals, the input selection circuit 140 transmits that received power to the second input terminal IN- of the selection chip U2.

[0039] The structure of the input selection circuit 140 is not unique. In this embodiment, the input selection circuit 140 includes a third diode D5 and a fourth diode D4. The anode of the third diode D5 is connected to the first output side of the active equalization system 300, and the anode of the fourth diode D4 is connected to the output terminal of the power control circuit 130. The cathodes of both the third diode D5 and the fourth diode D4 are connected to the second input terminal IN- of the selection chip U2. When the anode of the third diode D5 successfully receives power from the active equalization system 300, and the anode of the fourth diode D4 successfully receives power from the power control circuit 130, the output of the input selection circuit 140 is the larger of the output of the third diode D5 and the output of the cathode of the fourth diode D4. That is, it selects one path from the power from the active equalization system 300 and the power control circuit 130 to output to the second input terminal IN- of the selection chip U2, thus realizing the input selection function of the selection chip U2.

[0040] In one embodiment, see Figure 2 The selection device 100 also includes a first input voltage divider circuit 150. The first input terminal IN+ of the selection chip U2 is used to connect to the battery 20 through the first input voltage divider circuit 150. When the first input terminal IN+ of the selection chip U2 is used to connect to the battery 20 through the first input voltage divider circuit 150, the voltage connected to the selection chip U2 can be controlled within a suitable range by the first input voltage divider circuit 150, thereby improving design flexibility.

[0041] Specifically, the first input voltage divider circuit 150 includes resistors R5, R6, and R7 connected in series. The end of resistor R5 not connected to resistor R6 is used to connect to the positive terminal of battery 20. The common terminal of resistors R6 and R7 is connected to the first input terminal IN+ of the selection chip U2. The end of resistor R7 not connected to resistor R6 is used to connect to the negative terminal of battery 20. By appropriately setting the resistance values ​​of resistors R5, R6, and R7, the voltage connected to the selection chip U2 can be controlled within a suitable range. Expandably, the first input voltage divider circuit 150 also includes a capacitor C3, which is connected in parallel with resistor R7 to achieve filtering and other functions, improving the power quality connected to the selection chip U2.

[0042] In one embodiment, see Figure 2 The selection device 100 also includes a second input voltage divider circuit 160. The first output side of the active equalization system 300 is connected to the second input terminal IN- of the selection chip U2 through the second input voltage divider circuit 160. When the first output side of the active equalization system 300 is connected to the second input terminal IN- of the selection chip U2 through the second input voltage divider circuit 160, the second input voltage divider circuit 160 controls the voltage from the active equalization system 300 within a suitable range before transmitting it to the second input terminal IN- of the selection chip U2, thereby improving design flexibility.

[0043] Specifically, the second input voltage divider circuit 160 includes resistors R8 and R9 connected in series. The end of resistor R8 not connected to resistor R9 is connected to the first output side of the active equalization system 300. The common terminal of resistors R8 and R9 is connected to the second input terminal IN- of the selection chip U2. The end of resistor R9 not connected to resistor R8 is used to connect to the negative terminal of battery 20. By appropriately setting the resistance values ​​of resistors R8 and R9, the voltage connected to the selection chip U2 can be controlled within a suitable range. Expandably, the second input voltage divider circuit 160 also includes capacitor C4, which is connected in parallel with resistor R9 to achieve filtering and other functions, improving the power quality connected to the selection chip U2.

[0044] In one embodiment, see Figure 4 The battery management system 200 includes a DC-DC converter, a first linear regulator (LDO1), a first controller (MCU1), and a battery sampling chip (AFE). The output side of the selection device 100 is connected to the DC-DC converter, which is connected to the first linear regulator (LDO1). The first linear regulator (LDO1) is connected to the first controller (MCU1), which is connected to the battery sampling chip (AFE). The battery sampling chip (AFE) is connected to the battery 20. The DC-DC converter is connected to the second input side of the active balancing system 300.

[0045] Specifically, the DC-DC converter (DCDC) converts the voltage at the output of the selected device 100 and transmits it to the first linear regulator (LDO1) and the active equalization system 300. The LDO1 regulates the voltage and transmits it to the first controller (MCU1) for operation. The battery sampling chip (AFE) is connected to the battery 20 and can detect cell information within the battery 20, sending it to the MCU1. The MCU1 can then output corresponding signals based on the acquired information to control the operation of relevant devices, facilitating better monitoring of the battery 20. Specifically, the type of cell information is not unique and includes, but is not limited to, cell series voltage, charging / discharging current, and cell temperature.

[0046] In one embodiment, the active balancing system 300 includes an isolated charging power supply, a second linear regulator LDO2, a second controller MCU2, and a balancing switch. The second linear regulator LDO2 is connected to the battery management system 200 and also to the second controller MCU2. The second controller MCU2 is connected to the balancing switch. The input side of the isolated charging power supply is used to connect to a charging device. The first output side of the isolated charging power supply is connected to the balancing switch. The second output side of the isolated charging power supply is connected to a selection device 100. The balancing switch is used to connect to the battery 20.

[0047] Specifically, the isolated charging power supply can better achieve isolation, realizing the insulation and isolation of various power supplies used in the system. The isolated charging power supply can receive electrical energy from the charging device, process it, and then transmit the electrical energy to the balancing switch and selection device 100. The second linear regulator LDO2 is connected to the battery management system 200, specifically to the DC-DC converter (DCDC) of the battery management system 200, drawing power from the DC-DC converter and sending it to the second controller MCU2. The second controller MCU2 is connected to the balancing switch. When active balancing is initiated, the second controller MCU2 controls the balancing switch to poll and replenish the cells in each string, replenishing the first string before replenishing the second string, and so on, until each string is replenished. It is understood that in other embodiments, the active balancing system 300 can also use other balancing methods, as long as those skilled in the art believe it is feasible.

[0048] The aforementioned battery control device includes a battery management system 200, an active balancing system 300, and a selection device 100. One side of the battery management system 200 is connected to the output side of the selection device 100, and the other side is used to connect to the battery 20. The first input side of the selection device 100 is used to connect to the battery 20, and the second input side of the selection device 100 is connected to the first output side of the active balancing system 300. The first input side of the active balancing system 300 is used to connect to a charging device for charging and balancing the cells in the battery 20. The second input side of the active balancing system 300 is connected to the battery management system 200, and the second output side of the active balancing system 300 is used to connect to the battery 20. When the selection device 100 receives electrical energy from the active balancing system 300, it transmits the electrical energy from the active balancing system 300 to the battery management system 200. The battery management system 200 can optimize the performance of the battery 20, and the active balancing system 300 can perform charging balancing on the cells in the battery 20. The balancing effect is good. When the selection device 100 receives power from the active balancing system 300, that is, when the active balancing system 300 is connected to the charging equipment, it transfers the power from the active balancing system 300 to the battery management system 200. This ensures that both the battery management system 200 and the active balancing system 300 draw power from the charging equipment, avoiding the situation where the active balancing system 300 draws power from the battery 20 while it is charging and discharging simultaneously. This avoids unnecessary power waste, improves balancing efficiency, and ensures reliable use.

[0049] In one embodiment, a battery system is provided, including a battery 20 and a battery control device as described above.

[0050] Expandably, the battery system also includes a control switch connected to the battery 20 to enable on / off control of the charging and discharging of the battery 20, such as turning off charging when fully charged and turning off discharging when fully discharged.

[0051] To better understand the above embodiments, a detailed explanation is provided below with reference to a specific embodiment. In one embodiment, the battery system includes a battery management system 200, an active balancing system 300, a selection device 100, a battery 20, and a control switch. The battery management system 200 includes a DC-DC converter, a first linear regulator (LDO1), a first controller (MCU1), and a battery sampling chip (AFE). The active balancing system 300 includes an isolated charging power supply, a second linear regulator (LDO2), a second controller (MCU2), and a balancing switch. The battery 20 includes battery cells C1 to Cx. The battery management system 200 collects and manages the charging and discharging of the battery cells, while the active balancing system 300 performs active balancing of the battery cells through charging. The battery cells act as energy carriers, outputting energy during discharge and storing energy during charging. The control switch controls the charging and discharging process, such as turning off charging when fully charged and turning off discharging when fully discharged. Additionally, the labels B+ / B- in the diagram are directly connected to the battery cells, while P+ / P- serves as the external connection port for the 20 battery packs forming the entire system. This means that during discharge, the positive and negative terminals of the load are connected to P+ / P-, and during charging, the charging equipment is also connected to P+ / P-. When active balancing is activated (active balancing involves polling and replenishing each string of cells in turn (the second controller MCU2 controls the balancing switch), the first string is replenished before the second string, and so on, until each string is replenished), active balancing continues.

[0052] The selection device 100 selects between the B+ / B- signal and the output signal of the isolated charging power supply. If the isolated charging power supply has an output, the output of the selection device 100 is equal to the output of the isolated charging power supply; if the isolated charging power supply has no output, the output of the selection device 100 is equal to B+ / B-. The isolated charging power supply output is designed as a dual-output system: one output is provided to the selection device 100, and the other is provided to the equalization switch. For details, please refer to [link to relevant documentation]. Figure 2 In the diagram, OUTPUT1+ / OUTPUT1- are the output branches of the isolated charging power supply.

[0053] When OUTPUT1+ / OUTPUT1- has no output, B+ / B- outputs VCC_EN through the linear regulator U1. This VCC_EN serves as the power supply for the selector chip U2. B+ / B- is divided by resistors R5, R6, and R7 and then used as the input to the selector chip U2, connected to its IN+ pin. The combination of diodes D4 and D5 selects the larger voltage value; since OUTPUT1+ / OUTPUT1- has no output, VCC_EN is used. VCC_EN is divided by resistors R8 and R9 and connected to the IN- pin of the selector chip U2. When the voltage at IN+ is greater than the voltage at IN-, the OUT pin of the selector chip U2 outputs a high level. This high level turns on the switching transistor Q6 (transistor), which in turn turns on the switching transistor Q7 (MOSFET). B+ can then be output to the anode of diode D9. The combination of diodes D9 and D8 selects the larger voltage value; since OUTPUT1+ / OUTPUT1- has no output, B+ is used. The voltage at B+ passes through switching transistors Q1 and Q2 and Zener diode D2, resulting in a voltage of 12V at R4. After passing through linear regulator U1, it outputs 3.3V via VCC_EN.

[0054] When OUTPUT1+ / OUTPUT1- has an output, the combination of diodes D4 and D5 selects OUTPUT1+. The voltage drop from the voltage divider between resistors R8 and R9, input to IN-, is greater than IN+. This causes the OUT pin of chip U2 to output a low level, thus turning off both switching transistors Q6 (transistor) and Q7 (MOSFET). The anode of diode D9 becomes 0V, and the circuit consisting of D8 / D9 outputs OUTPUT1+. Therefore, the selection circuit achieves the following: when OUTPUT1+ / OUTPUT1- has no output, B+ is selected; when OUTPUT1+ / OUTPUT1- has an output, OUTPUT1+ is selected.

[0055] After this improvement, when charging balancing is initiated, the battery management system 200 and the active balancing system 300 are powered by an isolated charging power supply, i.e., P+ / P- power. The power used for cell balancing is also drawn from the isolated charging power supply, i.e., P+ / P- power. Therefore, the entire system is powered by P+ / P-, and not by B+ / B-, thus eliminating the discharge current issue that existed before the improvement and preventing the introduction of new problems with inconsistent cell voltages.

[0056] The aforementioned battery system includes a battery management system 200, an active balancing system 300, and a selection device 100. One side of the battery management system 200 is connected to the output side of the selection device 100, and the other side is used to connect to the battery 20. The first input side of the selection device 100 is used to connect to the battery 20, and the second input side of the selection device 100 is connected to the first output side of the active balancing system 300. The first input side of the active balancing system 300 is used to connect to a charging device for charging and balancing the cells in the battery 20. The second input side of the active balancing system 300 is connected to the battery management system 200, and the second output side of the active balancing system 300 is used to connect to the battery 20. When the selection device 100 receives electrical energy from the active balancing system 300, it transmits the electrical energy from the active balancing system 300 to the battery management system 200. The battery management system 200 can optimize the performance of the battery 20, and the active balancing system 300 can perform charging balancing on the cells in the battery 20. The balancing effect is good. When the selection device 100 receives power from the active balancing system 300, that is, when the active balancing system 300 is connected to the charging equipment, it transfers the power from the active balancing system 300 to the battery management system 200. This ensures that both the battery management system 200 and the active balancing system 300 draw power from the charging equipment, avoiding the situation where the active balancing system 300 draws power from the battery 20 while it is charging and discharging simultaneously. This avoids unnecessary power waste, improves balancing efficiency, and ensures reliable use.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A battery control device, characterized in that, The system includes a battery management system, an active balancing system, and a selection device. One side of the battery management system is connected to the output side of the selection device, and the other side is used to connect to a battery. The first input side of the selection device is used to connect to the battery, and the second input side of the selection device is connected to the first output side of the active balancing system. The first input side of the active balancing system is used to connect to a charging device for charging and balancing the cells in the battery. The second input side of the active balancing system is connected to the battery management system, and the second output side of the active balancing system is used to connect to the battery. When the selection device receives electrical energy from the active balancing system, it transmits the electrical energy from the active balancing system to the battery management system. The selection device includes a selection chip, a switching circuit, and an output selection circuit; The first input terminal of the selection chip is used to connect to the battery, the second input terminal of the selection chip is connected to the first output side of the active balancing system, the output terminal of the selection chip is connected to the switching circuit, the switching circuit is connected to the output selection circuit, the first input terminal of the output selection circuit is connected to the battery through the switching circuit, the second input terminal of the output selection circuit is connected to the first output side of the active balancing system, and the output terminal of the output selection circuit is connected to the battery management system.

2. The battery control device according to claim 1, characterized in that, The output selection circuit includes a first diode and a second diode. The anode of the first diode is connected to the battery through the switching circuit, the anode of the second diode is connected to the first output side of the active balancing system, and the cathodes of both the first diode and the second diode are connected to the battery management system.

3. The battery control device according to claim 2, characterized in that, The switching circuit includes a switching transistor Q6, a switching transistor Q7, and a switching auxiliary circuit. The output terminal of the selection chip is connected to the control terminal of the switching transistor Q6. The second terminal of the switching transistor Q6 is connected to the negative terminal of the battery. The first terminal of the switching transistor Q6 is connected to the control terminal of the switching transistor Q7. The first terminal of the switching transistor Q7 is connected to the positive terminal of the battery. The second terminal of the switching transistor Q7 is connected to the anode of the first diode.

4. The battery control device according to claim 1, characterized in that, The selection device further includes a power control circuit, the input of which is connected to the battery, and the output of which is connected to the power port of the selection chip.

5. The battery control device according to claim 4, characterized in that, The selection device further includes an input selection circuit, the first input terminal of which is connected to the output terminal of the power control circuit, the second input terminal of which is connected to the first output side of the active equalization system, and the output terminal of which is connected to the second input terminal of the selection chip.

6. The battery control device according to claim 1, characterized in that, The selection device further includes a first input voltage divider circuit, and the first input terminal of the selection chip is used to connect to the battery through the first input voltage divider circuit.

7. The battery control device according to claim 1, characterized in that, The selection device further includes a second input voltage divider circuit, and the first output side of the active equalization system is connected to the second input terminal of the selection chip through the second input voltage divider circuit.

8. The battery control device according to claim 1, characterized in that, The battery management system includes a DC-DC converter, a first linear regulator, a first controller, and a battery sampling chip. The output side of the selection device is connected to the DC-DC converter, the DC-DC converter is connected to the first linear regulator, the first linear regulator is connected to the first controller, the first controller is connected to the battery sampling chip, the battery sampling chip is connected to a device for connecting the battery, and the DC-DC converter is connected to the second input side of the active balancing system.

9. The battery control device according to claim 1, characterized in that, The active balancing system includes an isolated charging power supply, a second linear regulator, a second controller, and a balancing switch. The second linear regulator is connected to the battery management system and also to the second controller. The second controller is connected to the balancing switch. The input side of the isolated charging power supply is used to connect to a charging device. The first output side of the isolated charging power supply is connected to the balancing switch. The second output side of the isolated charging power supply is connected to the selection device. The balancing switch is used to connect to the battery.

10. A battery system, characterized in that, Includes a battery and a battery control device as described in any one of claims 1-9.

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