Battery pack management system

Abstract

A battery pack group management system comprises a control unit and at least two battery pack groups, and each battery pack group comprises two battery packs connected in series; each battery pack group supplies power to the equipment through the control circuit; the control circuit comprises a regulation and control circuit and a pre-charging circuit which are connected in parallel. The voltage sampling circuit collects the voltage of the battery pack and sends the voltage to the control unit. The battery pack supplies power to the equipment through the control circuit; the control circuit comprises a regulation and control circuit and a pre-charging circuit which are connected in parallel; the regulation and control circuit comprises two power tubes which are connected in series, and the two power tubes are connected in series between the battery pack and the equipment; the control unit controls the magnitude of current flowing through the regulation and control circuit through a power tube; the pre-charging circuit is provided with an electric control switch, and the control unit controls the on-off of the pre-charging circuit through the electric control switch. The first communication circuit collects high-position battery pack information and sends the information to the control unit, and the second communication circuit collects low-position battery pack information and sends the information to the control unit. As the battery packs are connected in series, the voltage platform is improved, and the current is reduced under the same power, so that the loss is reduced.

Description

Technical Field

[0001] The utility model relates to the field of battery management circuits, and particularly relates to a battery pack management system. Background Art

[0002] With the wide application of lithium battery packs in electronic devices, the power demand of the devices is increasing, and the power consumption of the devices continues to rise. The previous single battery pack can no longer meet the high-power demand, and the low-voltage platform battery pack has a relatively large loss in high-power applications.

[0003] The existing solutions mainly include the following two. 1. The technology of paralleling multiple battery packs with the same voltage level to increase the battery pack capacity. This technology has the risk of circulating current and can damage the battery pack. 2. Redesigning the battery pack to increase the battery pack capacity or raise the voltage platform. This technology will increase the volume of the battery pack and cause incompatibility with the previous battery packs, and the multi-purpose characteristic of one battery pack cannot be achieved. Therefore, in order to solve the above problems, a battery pack management system and a control method are needed. Summary of the Utility Model

[0004] In view of the deficiencies of the prior art, the utility model provides a battery pack management system.

[0005] A battery pack management system, characterized in that:

[0006] It includes a control unit and at least two groups of battery packs. Each group of battery packs includes two battery packs connected in series.

[0007] Each group of battery packs supplies power to the device through the control circuit. The control circuit includes a regulation circuit and a pre-charge circuit connected in parallel. The voltage sampling circuit collects the battery pack voltage and sends it to the control unit.

[0008] The battery pack supplies power to the device through the control circuit. The control circuit includes a regulation circuit and a pre-charge circuit connected in parallel.

[0009] The regulation circuit includes two power tubes connected in series. The two power tubes are connected in series between the battery pack and the device. The control unit controls the magnitude of the current flowing through the regulation circuit through the power tubes.

[0010] The pre-charge circuit has an electronic control switch, and the control unit controls the turn-off of the pre-charge circuit through the electronic control switch.

[0011] The first communication circuit collects the information of the high-level battery pack and sends it to the control unit, and the second communication circuit collects the information of the low-level battery pack and sends it to the control unit.

[0012] To better implement the utility model, it can be further:

[0013] The high - level battery pack is provided with a first communication port, and this first communication port communicates with the control unit through the first communication circuit;

[0014] The high - level battery pack has a first communication port, and this first communication port communicates with the control unit through the first communication circuit;

[0015] The first communication circuit includes MOS transistors Q7 and Q8. The gate of MOS transistor Q7 is connected to the first end of resistor R68. The second end of resistor R68 is connected to the first end of resistor R67. The second end of resistor R67 is the first interaction port, and this first interaction port communicates with the first communication port. A resistor R71 is connected in parallel between the gate and the drain of MOS transistor Q7;

[0016] The drain of MOS transistor Q7 is connected to the first end of resistor R65. The second end of resistor R65 is connected to the power supply. The common terminal of the drain of MOS transistor Q7 and resistor R65 is the first information receiving port;

[0017] The drain of MOS transistor Q8 is connected to the common terminal of resistor R67 and resistor R68. The source of MOS transistor Q8 is grounded. The gate of MOS transistor Q8 is connected to the first end of resistor R73. The second end of resistor R73 is the first information sending port. A resistor R74 is connected in parallel between the gate and the source of MOS transistor Q8. Both the first information receiving port and the first information sending port are connected to the control unit.

[0018] Furthermore: The low - level battery pack is provided with a second communication port, and this second communication port communicates with the control unit through the second communication circuit;

[0019] The second communication circuit includes MOS transistors Q13 and Q14. The gate of MOS transistor Q13 is connected to the first end of resistor R106. The second end of resistor R106 is connected to the first end of resistor R105. The second end of resistor R105 is the second interaction port, and this second interaction port communicates with the second communication port. A resistor R107 is connected in parallel between the gate and the source of MOS transistor Q13;

[0020] The drain of MOS transistor Q13 is connected to the first end of resistor R103. The second end of resistor R103 is connected to the power supply. The common terminal of the drain of MOS transistor Q13 and resistor R103 is the second information receiving port;

[0021] The drain of the MOS transistor Q14 is connected to the common terminal of the resistor R106 and the resistor R105. The source of the MOS transistor Q14 is grounded. The gate of the MOS transistor Q14 is connected to the first end of the resistor R108. The second end of the resistor R108 is the second information sending port. A resistor R109 is connected across the gate and the source of the MOS transistor Q14. Both the first information receiving port and the first information sending port are connected to the control unit.

[0022] Further: The regulation circuit includes the MOS transistors Q3 and Q4 connected in series between the battery and the device. The source of the MOS transistor Q3 is connected to the positive pole of the battery. The drain of the MOS transistor Q3 is connected to the drain of the MOS transistor Q4. The gate of the MOS transistor Q3 is connected to the first end of the resistor R42. The second end of the resistor R42 is connected to the first control port. The source of the MOS transistor Q4 is connected to the input end of the device. The gate of the MOS transistor Q4 is connected to the first end of the resistor R43. The second end of the resistor R43 is connected to the first control port. The second control circuit sends a second control signal to the second control signal input end. The first control circuit sends a first control signal to the first control signal input end.

[0023] Further: The pre-charge circuit includes the triode Q6 and the control switch K1. The control switch K1 is used to control the opening and closing of the switch circuit. The base of the triode Q6 is connected to the first end of the resistor R57. The second end of the resistor R57 is connected to the second control port. A resistor R59 is connected across the base and the emitter of the triode Q6. The collector of the triode Q6 is connected to the first control end of the control switch. The second control end of the control switch is connected to the power supply voltage.

[0024] Further: The voltage sampling circuit includes the triode G2. The emitter of the triode G2 is grounded. One branch of the base of the triode G2 is grounded through the resistor R58, and the other branch is connected to the third control port through the resistor R52.

[0025] The collector of the triode G2 is connected to the gate of the MOS transistor Q5 through the resistors R53, R54, R55, and R56 connected in parallel. The source of the MOS transistor Q5 is connected to the sampling input port. The sampling input port collects the corresponding battery pack voltage.

[0026] The drain of the MOS transistor Q5 is connected to the resistor R49 through the resistor R50. The other end of the resistor R49 is connected to the sampling output port.

[0027] Further: The sampling output port is grounded through the capacitor C47 and the resistor R51 connected in parallel.

[0028] Further: The signal of the high-voltage battery pack is processed by the isolation module U5 and then communicates with the second communication circuit, and the buck module U7 supplies power to the isolation module U5.

[0029] The beneficial effects of the present utility model are as follows:

[0030] Multiple battery pack groups are used for single-channel output to supply power to the device; and when the voltage of the connected battery pack groups drops to be close, the device can naturally parallel the battery pack groups. At the same time, by monitoring the real-time value of the current sensor and through the timing control of the control unit, it is possible to prevent the reverse charging current of the battery from being too large and damaging the battery. At the same time, by connecting the battery packs in series in a single channel, the voltage platform is increased, and the current is reduced under the same power, so the loss will be reduced. In addition, since the management of the battery pack groups can be carried out, the capacity of the battery packs is further increased, so that without changing the battery packs, the power output can be greatly improved and the usage time of the device can be increased. Through the pre-charge circuit, the capacitor in the device is slowly powered up to 70% of the battery voltage, avoiding the burning of the relay contacts. Then, the regulation circuit performs secondary power supply. Since the voltage has been pre-charged, the secondary power supply current is small and stable, avoiding too large an impact on the battery pack. Description of the Drawings

[0031] Figure 1 It is a schematic block diagram of the present utility model;

[0032] Figure 2 It is a schematic diagram of power supply for the battery pack group;

[0033] Figure 3 It is a specific circuit diagram of power supply for the battery pack group;

[0034] Figure 4 It is a structural diagram of the voltage sampling circuit;

[0035] Figure 5 It is a structural diagram of the first communication circuit;

[0036] Figure 6 It is a structural diagram of the second communication circuit. Specific Embodiment

[0037] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0038] As Figure 1 shown:

[0039] The specific technical solution of a battery pack group management system is as follows:

[0040] A battery pack management system includes a control unit and at least two groups of battery packs. Each group of battery packs includes two battery packs connected in series.

[0041] Each group of battery packs supplies power to the device through the control circuit. The control circuit includes a regulation circuit and a pre-charge circuit connected in parallel. The voltage sampling circuit collects the battery pack voltage and sends it to the control unit.

[0042] The battery pack supplies power to the device through the control circuit. The control circuit includes a regulation circuit and a pre-charge circuit connected in parallel.

[0043] The regulation circuit includes two power transistors connected in series. The two power transistors are connected in series between the battery pack and the device. The control unit controls the magnitude of the current flowing through the regulation circuit through the power transistors.

[0044] The pre-charge circuit has an electronic control switch. The control unit controls the turn-off of the pre-charge circuit through this electronic control switch.

[0045] The first communication circuit collects the information of the high-voltage battery pack and sends it to the control unit. The second communication circuit collects the information of the low-voltage battery pack and sends it to the control unit.

[0046] As Figure 1 and Figure 2 shown, for the convenience of explanation, 2 groups of battery packs and 2 groups of devices are taken as examples. Specifically, each group of battery packs has 2 groups of control circuits, and the 2 groups of control circuits are electrically connected to the 2 groups of devices in one-to-one correspondence.

[0047] A battery pack management system includes 2 groups of battery packs and a device. The 2 groups of battery packs are battery pack group B1 and battery pack group B2. Battery pack group B1 has a voltage sampling circuit E1, a current acquisition circuit I1, and a control circuit C1. Battery pack group B1 includes battery pack B 11 and battery pack B 12 ;

[0048] The control circuit C1 includes a regulation circuit CA1 and a pre-charge circuit CB1 connected in parallel between battery pack group B1 and device M1. The control unit controls the turn-on and turn-off of the regulation circuit CA1 and the pre-charge circuit CB1.

[0049] Battery pack B2. Battery pack B2 has a voltage sampling circuit E2, a current acquisition circuit I1, and a regulation circuit C2.

[0050] The control circuit C2 includes a regulation circuit CA2 and a pre-charge circuit CB2 connected in parallel between battery pack B2 and device M. The control unit controls the turn-on and turn-off of the regulation circuit CA2 and the pre-charge circuit CB2.

[0051] The control circuit includes MOS transistor Q3 and MOS transistor Q4 connected in series between the battery and the device. The source of MOS transistor Q3 is connected to the positive electrode of the battery. The drain of MOS transistor Q3 is connected to the drain of MOS transistor Q4. The gate of MOS transistor Q3 is connected to the first end of resistor R42. The second end of resistor R42 is connected to the first control port. The source of MOS transistor Q4 is connected to the input end of the device. The gate of MOS transistor Q4 is connected to the first end of resistor R43. The second end of resistor R43 is connected to the first control port. The second control circuit sends a second control signal to the second control signal input end, and the first control circuit sends a first control signal to the first control signal input end.

[0052] The pre-charge circuit includes triode Q6 and control switch K1. The control switch K1 is used to control the on / off of the switch circuit. The base of triode Q6 is connected to the first end of resistor R57. The second end of resistor R57 is connected to the second control port. A resistor R59 is connected across the base and emitter of triode Q6. The collector of triode Q6 is connected to the first control end of the control switch. The second control end of the control switch is connected to the power supply voltage.

[0053] The voltage sampling circuit includes triode G2. The emitter of triode G2 is grounded. One branch of the base of triode G2 is grounded through resistor R58, and the other branch is connected to the third control port through resistor R52.

[0054] The collector of triode G2 is connected to the gate of MOS transistor Q5 through resistors R53, R54, R55, and R56 connected in parallel. The source of MOS transistor Q5 is connected to the sampling input port, and the sampling input port collects the corresponding battery pack voltage;

[0055] The drain of MOS transistor Q5 is connected to resistor R49 through resistor R50. The other end of resistor R49 is connected to the sampling output port.

[0056] The sampling output port is grounded through capacitor C47 and resistor R51 connected in parallel.

[0057] Among them, the high-level battery pack has a first communication port, and the first communication port communicates with the control unit through the first communication circuit;

[0058] The signal of the high-level battery pack is processed by isolation module U5 and then communicates with the second communication circuit. Step-down module U7 supplies power to isolation module U5.

[0059] The first communication circuit includes MOS transistors Q7 and Q8. The gate of MOS transistor Q7 is connected to the first end of resistor R68. The second end of resistor R68 is connected to the first end of resistor R67. The second end of resistor R67 is the first interaction port, which communicates with the first communication port. A resistor R71 is connected in parallel between the gate and the drain of MOS transistor Q7;

[0060] The source of MOS transistor Q7 is connected to the first end of resistor R65. The second end of resistor R65 is connected to the power supply. The common terminal of the source of MOS transistor Q7 and resistor R65 is the first information receiving port;

[0061] The source of MOS transistor Q8 is connected to the common terminal of resistor R67 and resistor R68. The drain of MOS transistor Q8 is grounded. The gate of MOS transistor Q8 is connected to the first end of resistor R73. The second end of resistor R73 is the first information sending port. A resistor R74 is connected in parallel between the gate and the drain of MOS transistor Q8. Both the first information receiving port and the first information sending port are connected to the control unit.

[0062] Among them, the low - voltage battery pack has a second communication port, and the second communication port communicates with the control unit through the second communication circuit;

[0063] The second communication circuit includes MOS transistors Q13 and Q14. The gate of MOS transistor Q13 is connected to the first end of resistor R106. The second end of resistor R106 is connected to the first end of resistor R105. The second end of resistor R105 is the second interaction port, which communicates with the second communication port. A resistor R107 is connected in parallel between the gate and the drain of MOS transistor Q13;

[0064] The source of MOS transistor Q13 is connected to the first end of resistor R103. The second end of resistor R103 is connected to the power supply. The common terminal of the source of MOS transistor Q13 and resistor R103 is the second information receiving port;

[0065] The source of MOS transistor Q14 is connected to the common terminal of resistor R106 and resistor R105. The drain of MOS transistor Q14 is grounded. The gate of MOS transistor Q14 is connected to the first end of resistor R108. The second end of resistor R108 is the second information sending port. A resistor R109 is connected in parallel between the gate and the drain of MOS transistor Q14. Both the first information receiving port and the first information sending port are connected to the control unit.

[0066] A working method of a battery pack group management system includes two groups of battery pack groups, namely battery pack group B1 and battery pack group B2;

[0067] The battery pack group B1 includes the battery pack B 11 and the battery pack B 12 ;

[0068] The battery pack group B1 has a voltage sampling circuit E1, a first communication circuit TA1, a second communication circuit TB1, and a power supply circuit C1. The battery pack B1 is electrically connected to the device through the power supply circuit C1;

[0069] The battery pack B 12 interacts with the control unit through the first communication circuit TA1;

[0070] The battery pack B 11 interacts with the control unit through the second communication circuit TB1;

[0071] The power supply circuit C1 includes a regulation circuit CA1 and a pre-charge circuit CB1;

[0072] The control unit controls the opening and closing of the regulation circuit CA1 and the pre-charge circuit CB1;

[0073] The battery pack group B2 includes the battery pack B 21 and the battery pack B 22 ;

[0074] The battery pack group B2 has a voltage sampling circuit E2, a first communication circuit TA2, a second communication circuit TB2, and a power supply circuit C2. The battery pack B2 is electrically connected to the device through the power supply circuit C2;

[0075] The battery pack B 22 interacts with the control unit through the first communication circuit TA2;

[0076] The battery pack B 21 interacts with the control unit through the second communication circuit TB2;

[0077] The power supply circuit C2 includes a regulation circuit CA2 and a pre-charge circuit CB2;

[0078] The control unit controls the opening and closing of the regulation circuit CA2 and the pre-charge circuit CB2;

[0079] includes the following steps:

[0080] S1: For the battery pack group B in the 2-channel battery pack group i , the voltage sampling circuit E i collects the voltage V i of the battery pack group B i and sends it to the control unit to obtain a voltage data group including voltage V1 and voltage V2. Here, it is assumed that voltage V1 is greater than voltage V2, and i takes 1 and 2 in sequence;

[0081] S2: Here, it is assumed that the control unit selects the maximum voltage V in the voltage data group a , and the voltage V a is equal to the voltage V1. When the maximum voltage V a > the safety voltage threshold V S , the control unit determines that the battery pack B1 is the power supply according to the maximum voltage V1;

[0082] S3: There is a pre-charge threshold set, and the pre-charge threshold corresponds to 70% of the voltage of the battery pack B i . When the voltage of the capacitor in the device M reaches the pre-charge threshold, after the control unit turns off the pre-charge circuit CB1 of the battery pack B1, the control unit turns on the regulation circuit CA1 of the battery pack group B1 to supply power to the device M for the second time;

[0083] S4: The first communication circuit TA1 collects the information of the high-level battery pack and sends it to the control unit;

[0084] The second communication circuit TB1 collects the information of the low-level battery pack and sends it to the control unit;

[0085] When the control unit detects abnormal data in the battery pack, the control unit will issue an instruction to turn off the output of this circuit. The communication circuit uses a single-wire communication method, which is converted from a single communication line to a serial port signal, and the serial port signal is sent to the control circuit. The transmitted information includes the voltage level, specification parameters, and discharge capacity information of the battery pack;

[0086] S5: The control unit detects the voltages of the battery pack groups B1 and B2 in real-time, and the control unit connects the battery pack group B1 and the battery pack group B2 in parallel.

[0087] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0088] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. The narrative way of this specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A battery pack management system, characterized in that: It includes a control unit and at least two groups of battery packs, and each battery pack includes two battery packs connected in series; Each group of battery packs supplies power to the device through a control circuit; the control circuit includes a regulation circuit and a pre-charge circuit connected in parallel, and a voltage sampling circuit collects the battery pack voltage and sends it to the control unit; The battery pack supplies power to the device through the control circuit; the control circuit includes a regulation circuit and a pre-charge circuit connected in parallel; The regulation circuit includes two power tubes connected in series, and the two power tubes are connected in series between the battery pack and the device; the control unit controls the magnitude of the current flowing through the regulation circuit through the power tubes; The pre-charge circuit has an electronic control switch, and the control unit controls the turn-off of the pre-charge circuit through this electronic control switch; The first communication circuit collects the high-level battery pack information and sends it to the control unit, and the second communication circuit collects the low-level battery pack information and sends it to the control unit.

2. The battery pack management system according to claim 1, characterized in that: The high-level battery pack has a first communication port, and this first communication port communicates with the control unit through the first communication circuit; The first communication circuit includes MOS transistor Q7 and MOS transistor Q8. The gate of MOS transistor Q7 is connected to the first end of resistor R68, the second end of resistor R68 is connected to the first end of resistor R67, the second end of resistor R67 is the first interaction port, and this first interaction port communicates with the first communication port. A resistor R71 is connected across the gate and drain of MOS transistor Q7; The source of MOS transistor Q7 is connected to the first end of resistor R65, the second end of resistor R65 is connected to the power supply, and the common end of the source of MOS transistor Q7 and resistor R65 is the first information receiving port; The source of MOS transistor Q8 is connected to the common end of resistor R67 and resistor R68, the drain of MOS transistor Q8 is grounded, the gate of MOS transistor Q8 is connected to the first end of resistor R73, the second end of resistor R73 is the first information sending port, and a resistor R74 is connected across the gate and drain of MOS transistor Q8. Both the first information receiving port and the first information sending port are connected to the control unit.

3. The battery pack management system according to claim 2, characterized in that: The low-level battery pack has a second communication port, and this second communication port communicates with the control unit through the second communication circuit; The second communication circuit includes MOS transistor Q13 and MOS transistor Q14. The gate of MOS transistor Q13 is connected to the first end of resistor R106, the second end of resistor R106 is connected to the first end of resistor R105, the second end of resistor R105 is the second interaction port, and this second interaction port communicates with the second communication port. A resistor R107 is connected across the gate and source of MOS transistor Q13; The drain of the MOS transistor Q13 is connected to the first end of the resistor R103, the second end of the resistor R103 is connected to the power supply, and the common end of the drain of the MOS transistor Q13 and the resistor R103 is the second information receiving port; The drain of the MOS transistor Q14 is connected to the common end of the resistor R106 and the resistor R105, the source of the MOS transistor Q14 is grounded, the gate of this MOS transistor Q14 is connected to the first end of the resistor R108, the second end of this resistor R108 is the second information sending port, a resistor R109 is connected across the gate and the source of the MOS transistor Q14, and both the first information receiving port and the first information sending port are connected to the control unit.

4. The battery pack management system according to claim 3, characterized in that: The regulation circuit includes MOS transistors Q3 and Q4 connected in series between the battery and the device. The source of the MOS transistor Q3 is connected to the positive pole of the battery, the drain of the MOS transistor Q3 is connected to the drain of the MOS transistor Q4, the gate of the MOS transistor Q3 is connected to the first end of the resistor R42, the second end of the resistor R42 is connected to the first control port, the source of the MOS transistor Q4 is connected to the input end of the device, the gate of the MOS transistor Q4 is connected to the first end of the resistor R43, the second end of the resistor R43 is connected to the first control port, the second control circuit sends a second control signal to the second control signal input end, and the first control circuit sends a first control signal to the first control signal input end.

5. The battery pack management system according to claim 4, characterized in that: The pre-charge circuit includes a triode Q6 and a control switch K1. The control switch K1 is used to control the opening and closing of the switch circuit. The base of the triode Q6 is connected to the first end of the resistor R57, the second end of the resistor R57 is connected to the second control port, a resistor R59 is connected across the base and the emitter of the triode Q6, the collector of the triode Q6 is connected to the first control end of the control switch, and the second control end of the control switch is connected to the power supply voltage.

6. The battery pack management system according to claim 5, characterized in that: The voltage sampling circuit includes a triode G2. The emitter of the triode G2 is grounded. One branch of the base of the triode G2 is grounded through a resistor R58, and the other branch is connected to the third control port through a resistor R52; The collector of the triode G2 is connected to the gate of the MOS transistor Q5 through resistors R53, R54, R55, and R56 connected in parallel. The source of the MOS transistor Q5 is connected to the sampling input port, and the sampling input port collects the corresponding battery pack voltage; The drain of the MOS transistor Q5 is connected to the resistor R49 through a resistor R50, and the other end of the resistor R49 is connected to the sampling output port.

7. The battery pack management system according to claim 6, characterized in that: The sampling output port is grounded through a capacitor C47 and a resistor R51 connected in parallel.

8. The battery pack management system according to claim 7, characterized in that: The signal of the high-voltage battery pack is communicated with the second communication circuit after being processed by the isolation module U5, and the buck module U7 supplies power to the isolation module U5.

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