TWI678050B - Rechargeable battery management system - Google Patents

Abstract

A rechargeable battery management system includes a power switching circuit, a battery charging circuit, and a charging control circuit. The charging control circuit is connected to the power switching circuit and the battery charging circuit. The power switching circuit and the battery charging circuit A series charging mode and a one-hop charging mode for individual charging are sequentially performed on a plurality of rechargeable batteries, thereby ensuring fast charging of the rechargeable battery, saturation of the battery charge, and preventing overcharging from occurring, so as to effectively manage the charging. battery.

Description

Rechargeable battery management system

The present invention relates to a battery charging device, and particularly to a rechargeable battery management system.

With the advancement of science and technology, the demand for energy use has increased year by year. Whether it is petroleum fuel, non-renewable energy such as nuclear energy, or renewable energy such as wind, solar, tidal, and geothermal energy, they are mainly converted. Into electrical energy. Therefore, batteries that are stored and carried as electrical energy are increasingly valued, and among them, rechargeable batteries that can be recharged are particularly welcome.

Generally speaking, for a battery charging device for charging a rechargeable battery, a common charging method includes a series charging method or a parallel charging method. The series charging method means that a plurality of rechargeable batteries are connected in series, and the same charging current flows into all the rechargeable batteries at the same time. However, since the internal resistance and the remaining power of each rechargeable battery are not exactly the same, the voltage of the rechargeable battery will vary individually during serial charging, and the charging speed will therefore be different. In this way, when some of the rechargeable batteries are saturated with charging, other rechargeable batteries are overcharged or not yet saturated, which will shorten the life of some rechargeable batteries in the long run. The parallel charging method means that a plurality of rechargeable batteries are connected in parallel, and the charging current is distributed to all rechargeable batteries to be charged at the same time. The parallel charging method requires a large charging current, the control circuit is more complicated, and the cost of the battery charging device is higher. Due to the individual differences of rechargeable batteries, the charging current cannot be ideally and evenly distributed in parallel charging, and the problem of inconsistent charging status also exists.

Therefore, an object of the present invention is to provide a rechargeable battery management system that can solve the problem of uneven charging of batteries in the conventional technology to effectively manage the rechargeable batteries.

The technical means adopted by the present invention to solve the problems of the conventional technology is to provide a rechargeable battery management system, comprising: a power switching circuit, which is switched between a certain current power source and a certain voltage power source; a battery charging circuit, which is connected to The power switching circuit is configured to be connected to a plurality of rechargeable batteries to be charged. The battery charging circuit is switchable between a series conduction state and an alternate conduction state. In the series conduction state, the plurality of rechargeable batteries pass through The battery charging circuit is serially connected to the power switching circuit, and in the alternate conduction state, a plurality of the rechargeable batteries alternately conducts the individual rechargeable batteries to the power switching circuit via the battery charging circuit; and The charging control circuit is connected to the power switching circuit and the battery charging circuit, and sequentially performs a series charging mode and a jump charging mode on a plurality of the rechargeable batteries through the power switching circuit and the battery charging circuit. , The series charging mode is that the power switching circuit is switched to be connected to the constant current circuit. The battery charging circuit is switched to the series conduction state to charge a plurality of the rechargeable batteries in series at a constant current. The skip charging mode is that the power switching circuit is switched to the constant voltage power supply and the battery charging circuit is switched. Switch to the alternate conduction state to charge the individual rechargeable batteries at a constant voltage alternately.

According to an embodiment of the present invention, a rechargeable battery management system is provided, wherein the battery charging circuit includes a plurality of battery setting circuits, each of which has a positive terminal and a negative terminal for connecting A plurality of the battery setting circuits are sequentially arranged at the positive electrode and the negative electrode of the individual rechargeable battery, and the negative connection terminal of the battery setting circuit at the last order is grounded; a plurality of power switch circuits are respectively connected to the power switching circuit and Between the positive connection terminals of the individual battery setting circuits, so that the power switching circuit and the positive connection terminals of the individual battery setting circuits are conductive or non-conducting; and a plurality of connection switching circuits are respectively connected in the sequence phase Between the two adjacent battery setting circuits, each of the connection switching circuits can be switched to a conducting state and a grounding state, and in the conducting state, the two adjacent battery setting circuits are turned on via the connection switching circuit. In the grounding state, the two battery settings in the two adjacent battery setting circuits are sorted first. The negative connection terminal of the circuit is grounded via the connection switching circuit, wherein in the series conducting state, the power switch circuit connected to the positive connection terminal of the battery setting circuit in the frontmost order is on, and a plurality of the connection switching circuit systems Switching to the conducting state, in the alternate conducting state, the individual power switch circuits are alternately conducting, and the plurality of connection switching circuits are switched to the ground state.

According to an embodiment of the present invention, a rechargeable battery management system is provided, wherein the power switch circuit and the connection switching circuit are relay circuits.

According to an embodiment of the present invention, a rechargeable battery management system is provided, wherein The battery charging circuit is further switchable between the series conducting state, the alternate conducting state, and a circuit-off state. In the circuit-off state, the plurality of rechargeable batteries are non-conducting through the battery charging circuit and do not The power switching circuit is turned on, and the charging control circuit further executes the series charging mode, a battery rest mode, and the skip charging mode on a plurality of the rechargeable batteries in sequence through the power switching circuit and the battery charging circuit. The battery rest mode is that the battery charging circuit is switched to the circuit cut-off state to stop charging the rechargeable battery.

An embodiment of the present invention provides a rechargeable battery management system, further comprising a voltage sensing circuit connected to the battery charging circuit for sensing a voltage of the rechargeable battery in the series charging mode, and the The charging control circuit includes a series charging end unit connected to the voltage sensing circuit. When it is determined that the voltage of the rechargeable battery in the series charging mode is greater than a preset voltage threshold, the series charging mode is ended.

According to an embodiment of the present invention, a rechargeable battery management system is provided. The rechargeable battery management system further includes a current sensing circuit connected to the battery charging circuit to sense the current of the individual rechargeable batteries in the skip charging mode. And the charging control circuit includes a jump-charge end unit connected to the current sensing circuit, and when it is determined that the current of the rechargeable battery in the jump-charge mode reaches a preset current threshold, the individual The rechargeable battery is charged.

According to an embodiment of the present invention, a rechargeable battery management system is provided, wherein the charging control circuit includes a skip-charge charging rotation unit connected to the battery charging circuit, and when determining the skip-charge mode individually When the charging time of the rechargeable battery reaches a preset time threshold, charging is performed alternately to the next rechargeable battery.

According to an embodiment of the present invention, a rechargeable battery management system is provided, which further includes an overcurrent protection circuit connected to the battery charging circuit for sensing and limiting the charging current of the series charging mode to prevent overcurrent charging. .

According to an embodiment of the present invention, a rechargeable battery management system is provided, which further includes an over-voltage protection circuit connected to the battery charging circuit for sensing and limiting the charging voltage of the skip-charge charging mode to prevent over-voltage. Charging.

An embodiment of the present invention provides a rechargeable battery management system, wherein the rechargeable battery is a battery pack including a plurality of battery cells connected in parallel.

Through the technical means adopted by the rechargeable battery management system of the present invention, the rechargeable battery can be charged in a constant voltage series charging and constant current jump charging manner, thereby ensuring fast charging of the rechargeable battery, saturation of battery charging, and Prevents overcharging to effectively manage rechargeable batteries. Moreover, in the embodiment of the present invention, a battery rest mode is further added, which can prevent the internal ions of the rechargeable battery from accumulating on the electrodes at the end of the series charging and affect the execution of the charging, so as to ensure that the rechargeable battery can be accurately charged during the subsequent skip charging Charging is saturated.

100‧‧‧ rechargeable battery management system

1‧‧‧Power Switching Circuit

2‧‧‧ Battery charging circuit

21‧‧‧ Battery setting circuit

211‧‧‧Positive terminal

212‧‧‧Negative terminal

22‧‧‧ Battery Setting Circuit

221‧‧‧Positive terminal

222‧‧‧ Negative terminal

23‧‧‧ Battery Setting Circuit

231‧‧‧Positive terminal

232‧‧‧ Negative terminal

3‧‧‧Charge control circuit

31‧‧‧series charging end unit

32‧‧‧Skip charging end unit

33‧‧‧Skipping and charging rotation unit

41‧‧‧Voltage sensing circuit

42‧‧‧Current sensing circuit

51‧‧‧Overcurrent protection circuit

52‧‧‧Over-voltage protection circuit

6‧‧‧ Display

B‧‧‧ Rechargeable battery

COM‧‧‧Total points

GND‧‧‧ Ground

NC‧‧‧Normally closed contact

NO‧‧‧Normally open contact

P1‧‧‧Constant current power supply

P2‧‧‧constant voltage power supply

R1‧‧‧Power Switch Circuit

R12‧‧‧ Connect switch circuit

R2‧‧‧Power Switch Circuit

R23‧‧‧ Connect switch circuit

R3‧‧‧Power Switch Circuit

S10‧‧‧step

S20‧‧‧step

S30‧‧‧step

S40‧‧‧step

S50‧‧‧step

S60‧‧‧step

S70‧‧‧step

[Figure 1] is a block diagram showing a rechargeable battery management system according to an embodiment of the present invention; [Figure 2] is a circuit diagram showing a battery charging circuit of a rechargeable battery management system according to an embodiment of the present invention; FIG. 3a] is a schematic circuit diagram showing a battery charging circuit of a rechargeable battery management system in a series charging mode according to an embodiment of the present invention; [FIG. 3b to FIG. 3d] are circuit diagrams showing a battery charging circuit of a rechargeable battery management system according to an embodiment of the present invention in a skip charge mode; [FIG. 4] is a diagram showing an embodiment according to the present invention [Fig. 5] is a schematic diagram showing an operation flow of a rechargeable battery management system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 5. This description is not intended to limit the embodiment of the present invention, but is an example of the embodiment of the present invention.

As shown in FIG. 1 to FIG. 5, a rechargeable battery management system 100 according to an embodiment of the present invention includes: a power switching circuit 1 that is switchably connected between a certain current power source P1 and a certain voltage power source P2; A battery charging circuit 2 is connected to the power switching circuit 1 and is used to connect to a plurality of rechargeable batteries B to be charged. The battery charging circuit 2 is switchable between a series conduction state and an alternate conduction state. In the series conduction state, a plurality of the rechargeable batteries B are connected in series through the battery charging circuit 2 and are electrically connected to the power switching circuit 1. In the rotation conduction state, the plurality of rechargeable batteries B are rotated through the battery charging circuit 2 Ground the individual rechargeable battery B to the power switching circuit 1; and a charging control circuit 3 connected to the power switching circuit 1 and the battery charging circuit 2 through the power switching circuit 1 and the battery charging circuit 2 and sequentially perform a series charging mode (Figure 3a) and a jump charging mode (Figures 3b to 3d) on the plurality of rechargeable batteries B in sequence, wherein the series charging mode is switched for the power supply. The switching circuit 1 is switched to be connected to the constant current power source P1, and the battery charging circuit 2 is switched to the series conducting state to charge a plurality of the rechargeable batteries B connected in series at a constant current, and the jump charging is performed. The mode is that the power switching circuit 1 is switched to be connected to the constant voltage power source P2, the battery charging circuit 2 is switched to the alternate conduction state, and the individual rechargeable batteries B are alternately charged at a constant voltage.

It should be noted that, in the rechargeable battery management system 100 of this embodiment, each of the rechargeable batteries B is not limited to a single battery, but may also be a battery pack including a plurality of battery cells (not shown) connected in parallel. In addition, although the number of the rechargeable batteries B is three in this embodiment, the present invention is not limited thereto, and the number of the rechargeable batteries B may be arbitrarily increased or decreased as required. In addition, as long as the rechargeable battery B can be recharged and reused, its type is not limited, but a lithium battery having a light weight and a high energy density is a better choice.

As shown in FIGS. 2 to 3d, in the rechargeable battery management system 100 of the embodiment, the battery charging circuit 2 includes a plurality of battery setting circuits 21, 22, and 23, each of which has a positive electrode. A connection terminal and a negative connection terminal (that is, the battery setting circuit 21 has a positive connection terminal 211 and a negative connection terminal 212, the battery setting circuit 22 has a positive connection terminal 221 and a negative connection terminal 222, and the battery setting circuit 23 has a positive electrode connection terminal 231 and a negative electrode connection terminal 232), which are respectively used to connect to the positive electrode and the negative electrode of the respective rechargeable battery B, and a plurality of the battery setting circuits 21, 22, and 23 are arranged in sequence and sorted last The negative connection terminal 232 of the battery setting circuit 23 is grounded; a plurality of power switch circuits R1, R2, R3 are respectively connected to the positive connection terminals 211 of the power switching circuit 1 and the individual battery setting circuits 21, 22, 23, Between 221 and 231 (that is, the power switch circuit R1 is connected between the power switch circuit 1 and the positive terminal 211 of the battery setting circuit 21, and the power switch circuit R2 is connected between the power switch circuit 1 and Between the positive terminal 221 of the battery setting circuit 22 and the power switch circuit R3 between the power switching circuit 1 and the positive terminal 231 of the battery setting circuit 23), so that the power switching circuit 1 and individual The battery setting circuits 21, 22, and 23 are connected or not connected between the positive connection terminals 211, 221, and 231; and a plurality of connection switching circuits R12 and R23, respectively Connected between the two adjacent battery setting circuits (21 and 22, 22, and 23) (that is, the connection switching circuit R12 is connected between the battery setting circuit 21 and the battery setting circuit 22, and the connection is switched The circuit R23 is connected between the battery setting circuit 22 and the battery setting circuit 23). Each of the connection switching circuits R12 and R23 can be switched to a conducting state and a grounding state. In the conducting state, two adjacent ones are sorted. The battery setting circuits (21 and 22, 22, and 23) are turned on through the connection switching circuits R12 and R23, and in the ground state, the negative electrodes of the battery setting circuits that are ranked first among the two adjacent battery setting circuits are sorted. The connection terminal is grounded via the connection switching circuits R12, R23 (that is, the negative connection terminal 212 of the battery setting circuit 21 that is ranked first among the two adjacent battery setting circuits 21, 22 is ordered via the connection switching circuit. R12 is grounded, and the negative connection terminal 222 of the battery setting circuit 22 that is ranked first among the two adjacent battery setting circuits 22 and 23 is grounded via the connection switching circuit R23. Among them, the series conduction state (Figure 3a), the power switch circuit R1 connected to the positive connection terminal 211 of the battery setting circuit 21 at the front is turned on, and a plurality of the connection switching circuits R12 and R23 are switched to the conductive state, and in the round In the on-state (Figures 3b to 3d), the individual power switch circuits R1, R2, and R3 are alternately turned on, and the plurality of connection switching circuits R12 and R23 are switched to the grounded state.

As shown in FIG. 4, in the rechargeable battery management system 100 of this embodiment, the power switch circuits R1, R2, R3 and the connection switching circuits R12, R23 are relay circuits. Taking the connection switching circuit R12 as an example, the relay circuit includes a relay and a driving circuit. The relay has a common contact (COM), a normally open contact (NO), and a normally closed contact (NC). The common contact COM is connected to the negative connection terminal 212 of the battery setting circuit 21, the normally open contact NO is connected to the positive connection terminal 221 of the battery setting circuit 22, and the normally closed contact NC is connected to the ground GND. The driving circuit in this embodiment uses an NPN transistor as the main structure and is charged by the The control circuit 3 performs control. When the transistor is turned on, a current flows through the relay coil to excite the coil, so that the common contact COM is in conduction with the normally open contact NO, which is the conduction state at this time. When the transistor is turned off, the current is discharged by the relay coil to demagnetize the coil, so that the common contact COM is connected to the normally closed contact NC, and at this time, it is in the grounded state.

As shown in FIG. 2, in the rechargeable battery management system 100 of this embodiment, the battery charging circuit 2 is further switchable between the series conduction state, the alternate conduction state, and a circuit off state. In the circuit cut-off state, the plurality of rechargeable batteries B are non-conducting to each other and not to the power switching circuit 1 through the battery charging circuit 2, and the charging control circuit 3 is further connected by the power switching circuit 1 and the battery charging circuit. 2 and sequentially execute the series charging mode, a battery rest mode, and the jump charge mode on a plurality of the rechargeable batteries B, wherein the battery rest mode is that the battery charging circuit 2 is switched to the circuit cut-off state to stop the battery charging This rechargeable battery B is charged. By adding the battery rest mode, it is possible to prevent the internal ions of the rechargeable battery B from collecting on the electrodes at the end of the series charging mode and affecting the execution of the charging, so as to ensure that the rechargeable battery B can be accurately used in the subsequent charging mode Charging is saturated.

As shown in FIG. 1, the rechargeable battery management system 100 in this embodiment further includes a voltage sensing circuit 41 and a current sensing circuit 42. The voltage sensing circuit 41 is connected to the battery charging circuit 2 to sense the voltage of the rechargeable battery B in the series charging mode. The current sensing circuit 42 is connected to the battery charging circuit 2 and is configured to sense the current of the individual rechargeable battery B in the skip charging mode. In addition, the charging control circuit 3 further includes a series charging end unit 31, a jump charge end unit 32, and a jump charge alternate unit 33. The series charging end unit 31 is connected to the voltage sensing circuit 41. When it is determined that the voltage of the rechargeable battery B in the series charging mode is greater than a preset voltage threshold, the series charging mode is ended. The jump-charge end unit 32 is connected to the current sensing circuit 42, When it is determined that the current of the rechargeable battery B in the skip charging mode reaches a preset current threshold, the charging of the individual rechargeable battery B is ended. The skip-charge charging rotation unit 33 is connected to the battery charging circuit 2. When it is determined that the charging time of the individual rechargeable battery B in the skip-charge charging mode reaches a preset time threshold, the rotation to the next The battery B is charged.

As shown in FIG. 1, the rechargeable battery management system 100 of this embodiment further includes an overcurrent protection circuit 51 and an overvoltage protection circuit 52. The overcurrent protection circuit 51 is connected to the battery charging circuit 2 and is used to sense and limit the charging current in the series charging mode to prevent overcurrent charging. The over-voltage protection circuit 52 is connected to the battery charging circuit 2 and is used to sense and limit the charging voltage in the skip-charge charging mode to prevent over-voltage charging.

As shown in FIG. 1, the rechargeable battery management system 100 of this embodiment further includes a display 6 connected to the charging control circuit 3 for displaying the voltage and current values obtained by the above sensing, so as to facilitate at any time Monitor battery information.

As shown in FIG. 5, in this embodiment, when the rechargeable battery management system 100 is in actual operation, first, voltage sensing is performed on the rechargeable battery B (step S10) to determine whether the rechargeable battery B has not reached a level of one. The voltage threshold requires charging (step S20). If it is necessary to charge the rechargeable battery B because the voltage of the rechargeable battery B is insufficient (ie, YES), the series charging mode is executed (step S30).

In the series charging mode, as shown in FIG. 3a, the power switching circuit 1 is switched to be connected to the constant current power source P1, and the battery charging circuit 2 is switched to the series conduction state, so that a plurality of the rechargeable batteries B pass through the battery. The charging circuit 2 is connected in series to the power switching circuit 1 to charge a plurality of the rechargeable batteries B connected in series at a constant current. It should be noted that the charging voltage used in the series charging mode is lower than the rated voltage of the plurality of rechargeable batteries B connected in series, so even if the voltage of the rechargeable battery B reaches the charging voltage, it will not cause the battery Overcharge and thereby suppress battery temperature Rise. In the series charging mode, the voltage sensing circuit 41 senses the voltage of the rechargeable battery B (ie, the total series voltage) to determine whether the voltage of the rechargeable battery B is greater than a preset voltage threshold (step S40).

When the voltage of the rechargeable battery B is greater than the voltage threshold, the series charging end unit 31 ends the series charging mode, and the charging control circuit 3 then executes the battery rest mode (step S50). As shown in FIG. 2, the rechargeable battery B is not charged at this time, so as to alleviate the situation that the ions in the rechargeable battery are collected on the electrodes. The duration of the battery rest mode may be about three minutes.

After the battery rest mode is completed, the charging control circuit 3 executes a skip charging mode (step S60), and alternately (for example, in the order of FIG. 3b, FIG. 3c, and FIG. 3d) causes the individual charging The battery B is connected to the constant-voltage power supply P2 and is charged. In the skip charge mode, except for the rechargeable battery B being charged, the remaining rechargeable battery B is not connected to the power source and is in a rest state, which helps the rechargeable battery B that has just been charged to be used as a battery. The balance of ions to get more accurate sensing value during sensing. At this time, the current sensing circuit 42 senses the current of the rechargeable battery B during charging to determine whether the current of the rechargeable battery B reaches a preset current threshold (step S70). When the current of the rechargeable battery B reaches the current threshold, the skip-charging end unit 32 will end the current charging of the rechargeable battery B, and charge to the next rechargeable battery B alternately. In addition, when the charging time of the current rechargeable battery B reaches a preset time threshold, the current charging battery B is also terminated by the jump-charging rotation unit 33, and the next one The battery B is charged. When all the rechargeable batteries B are charged and saturated, the charging control circuit 3 ends the charge skipping charging mode.

With the above structure, the rechargeable battery management system 100 of the present invention can charge the rechargeable battery B in a constant voltage series charging and constant current jump charging manner, thereby ensuring fast charging of the rechargeable battery B and saturation of battery charging. And to prevent the occurrence of overcharging, in order to effectively manage the rechargeable battery B. Moreover, in the embodiment of the present invention, a battery rest may be further added between two charges. Time, it can prevent the internal ions of the rechargeable battery from accumulating on the electrode from the previous charge and affect the execution of the next charge, so as to ensure that the rechargeable battery B can be accurately saturated.

The above descriptions and descriptions are merely illustrations of the preferred embodiments of the present invention. Those with ordinary knowledge of this technology may make other modifications based on the scope of the patent application defined below and the above description, but these modifications should still be made. It is the spirit of the present invention and is within the scope of the present invention.

Claims (9)

A rechargeable battery management system includes: a power switching circuit that is switched between a certain current power source and a certain voltage power source; a battery charging circuit that is connected to the power switching circuit and is used to connect to a plurality of rechargeable batteries to be charged The battery charging circuit is switchable between a series conduction state and an alternate conduction state. In the series conduction state, a plurality of the rechargeable batteries are connected in series and connected to the power switching circuit via the battery charging circuit. Alternately conducting state, a plurality of the rechargeable batteries alternately conducting individual rechargeable batteries to the power switching circuit via the battery charging circuit; and a charging control circuit connected to the power switching circuit and the battery charging circuit, A series charging mode and a jump charging mode are sequentially performed on a plurality of the rechargeable batteries through the power switching circuit and the battery charging circuit, wherein the series charging mode is that the power switching circuit is switched to be connected to the Constant current power supply, the battery charging circuit is switched to the series conducting state to A plurality of the rechargeable batteries are charged at a constant current, and the skip-charge charging mode is that the power switching circuit is switched to be connected to the constant voltage power source, the battery charging circuit is switched to the alternate conduction state, and the individual ones are alternately rotated. The rechargeable battery is charged at a constant voltage. The battery charging circuit is further switchable between the series conduction state, the alternate conduction state and a circuit off state. In the circuit off state, a plurality of the rechargeable batteries are charged via the battery. Circuits without conducting each other and not connected to the power switching circuit, and the charging control circuit further sequentially executes the series charging mode and a battery rest on a plurality of the rechargeable batteries through the power switching circuit and the battery charging circuit Mode and the skip charging mode, wherein the battery rest mode is that the battery charging circuit is switched to the circuit cut-off state to stop charging the rechargeable battery. The rechargeable battery management system according to claim 1, wherein the battery charging circuit includes: a plurality of battery setting circuits, each of which has a positive connection terminal and a negative connection terminal, and is used to connect to an individual battery connection circuit. The positive electrode and the negative electrode of the rechargeable battery. A plurality of the battery setting circuits are sequentially arranged, and the negative connection terminal of the battery setting circuit in the last order is grounded. A plurality of power switch circuits are respectively connected to the power switching circuit and the individual batteries. Setting the positive connection terminals of the circuit so that the power switching circuit and the individual positive connection terminals of the battery setting circuit are conducting or non-conducting; and a plurality of connection switching circuits are respectively connected to two adjacent ones in sequence Between the battery setting circuits, each of the connection switching circuits can be switched to a conducting state and a grounding state, and in the conducting state, two adjacent battery setting circuits are turned on via the connection switching circuit and connected to the ground. State, order the negative connection of the battery setting circuit that is ranked first in the two adjacent battery setting circuits The terminal is grounded via the connection switching circuit, wherein, in the series conducting state, the power switch circuit connected to the positive connection terminal of the battery setting circuit in the frontmost order is conductive, and a plurality of the connection switching circuits are switched to the conductive State, in the alternate conduction state, the individual power switch circuits are alternately conducting, and the plurality of connection switching circuits are switched to the ground state. The rechargeable battery management system according to claim 2, wherein the power switch circuit and the connection switching circuit are relay circuits. The rechargeable battery management system according to claim 1, further comprising a voltage sensing circuit connected to the battery charging circuit for sensing the voltage of the rechargeable battery in the series charging mode, and the charging control circuit includes A series charging end unit is connected to the voltage sensing circuit. When it is determined that the voltage of the rechargeable battery in the series charging mode is greater than a preset voltage threshold, the series charging mode is ended. The rechargeable battery management system according to claim 1, further comprising a current sensing circuit connected to the battery charging circuit, for sensing the current of the individual rechargeable battery in the skip charging mode, and the charging. The control circuit includes a jump-charge end unit connected to the current sensing circuit. When it is determined that the current of the rechargeable battery in the jump-charge mode reaches a preset current threshold, the control of the individual rechargeable batteries is ended. Charging. The rechargeable battery management system according to claim 1, wherein the charging control circuit includes a skip-charge charging rotation unit connected to the battery charging circuit and charging the individual rechargeable battery when determining the skip-charge mode When the time reaches a preset time threshold, charging is performed alternately to the next rechargeable battery. The rechargeable battery management system according to claim 1, further comprising an overcurrent protection circuit connected to the battery charging circuit for sensing and limiting the charging current in the series charging mode to prevent overcurrent charging. The rechargeable battery management system according to claim 1, further comprising an over-voltage protection circuit connected to the battery charging circuit for sensing and limiting the charging voltage of the skip-charge charging mode to prevent over-voltage charging. The rechargeable battery management system according to claim 1, wherein the rechargeable battery is a battery pack including a plurality of battery cells connected in parallel.