Single-output battery pack management system

Abstract

A single-output battery pack management system comprises a control unit and at least two battery packs, and each battery pack supplies power to equipment through a 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, the control unit controls the on-off of the pre-charging circuit through the electric control switch, and the communication circuit collects the information of the battery pack and sends the information to the control unit. A plurality of battery packs are output in a single way to supply power to equipment, and when the voltage of the connected battery packs is reduced to be close, the device can naturally connect the battery packs in parallel.

Description

Technical Field

[0001] The utility model relates to the field of battery management circuits, and in particular to a single-output battery pack management system. Background Art

[0002] With the widespread use of lithium battery packs in electronic devices, the power demand of the equipment has become increasingly larger, and the power consumption of the equipment has continued to increase. The previous single battery pack can no longer meet the high power demand, and the low-voltage platform battery pack has a problem of high loss in high-power use.

[0003] The existing technology is, first, to directly connect multiple battery packs of the same voltage level in parallel to increase the battery pack capacity. This technical solution lacks a management system, and direct voltage parallel connection will cause a circulating current risk and damage the battery pack after a voltage difference occurs. Second, redesigning the battery pack to increase the battery pack capacity or increase the voltage platform will cause incompatibility with previous battery packs and fail to achieve the multi-purpose characteristics of the battery pack. Therefore, in order to solve the above problems, a single-output battery pack management system is needed. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model proposes a single-output battery pack management system, wherein a specific technical solution of a single-output battery pack management system is as follows:

[0005] It includes a control unit and at least two battery packs, each battery pack supplies power to the device through a control circuit;

[0006] The control circuit includes a parallel control circuit and a pre-charging circuit, and the voltage sampling circuit collects the battery pack voltage and sends it to the control unit;

[0007] The control circuit comprises a regulating circuit and a pre-charging circuit connected in parallel;

[0008] The control 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 current flowing through the control circuit through the power tubes;

[0009] The pre-charging circuit has an electric control switch, and the control unit controls the shut-off of the pre-charging circuit through the electric control switch;

[0010] The communication circuit collects the battery pack information and sends it to the control unit.

[0011] In order to better realize the utility model, it is possible to further:

[0012] The battery pack has a communication port, and the communication circuit includes a MOS tube Q7 and a MOS tube Q8. The gate of the MOS tube Q7 is connected to the first end of the resistor R68, and the second end of the resistor R68 is connected to the first end of the resistor R67. The second end of the resistor R67 is a first interactive port, and the first interactive port communicates with the communication port. A resistor R71 is connected between the gate and the drain of the MOS tube Q7.

[0013] The source of the MOS transistor Q7 is connected to the first end of the resistor R65, the second end of the resistor R65 is connected to the power supply, and the common end of the source of the MOS transistor Q7 and the resistor R65 is a first information receiving port;

[0014] The source of the MOS tube Q8 is connected to the common end of the resistor R67 and the resistor R68, the drain of the MOS tube Q8 is grounded, the gate of the MOS tube Q8 is connected to the first end of the resistor R73, the second end of the resistor R73 is the first information sending port, and a resistor R74 is bridged between the gate and the drain of the MOS tube Q8, and the first information receiving port and the first information sending port are both communicatively connected to the control unit.

[0015] Further: the control circuit includes a MOS tube Q3 and a MOS tube Q4 connected in series between the battery and the device, the source of the MOS tube Q3 is connected to the positive electrode of the battery pack, the drain of the MOS tube Q3 is connected to the drain of the MOS tube Q4, the gate of the MOS tube 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 of the control unit, the source of the MOS tube Q4 is connected to the input end of the device, the gate of the MOS tube Q4 is connected to the first end of the resistor R43, and the second end of the resistor R43 is connected to the second control port of the control unit.

[0016] Further: the pre-charging circuit includes a transistor 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 transistor Q6 is connected to the first end of the resistor R57, the second end of the resistor R57 is connected to the third control port of the control unit, a resistor R59 is bridged between the base and the emitter of the transistor Q6, the collector of the transistor Q6 is connected to the first control end of the control switch, and the second control end of the control switch is the output end.

[0017] Further: the voltage sampling circuit includes a transistor G2, the emitter of the transistor G2 is grounded, one branch of the base of the transistor G2 is grounded via a resistor R58, and the other branch is connected to the fourth control port via a resistor R52;

[0018] The collector of the transistor G2 is connected to the gate of the MOS transistor Q5 via the parallel resistors R53, R54, R55 and R56, and the source of the MOS transistor Q5 is connected to the sampling input port, which collects the corresponding battery pack voltage;

[0019] The drain of the MOS tube Q5 is connected to the resistor R49 via the resistor R50, and the other end of the resistor R49 is connected to the sampling output port.

[0020] Furthermore: the sampling output port is grounded via a capacitor C47 and a resistor R51 connected in parallel.

[0021] The beneficial effects of the utility model are:

[0022] The device is powered by a single-channel output of multiple battery packs, and when the voltage of the connected battery packs is reduced to a similar level, the device can naturally connect the battery packs in parallel. At the same time, by monitoring the real-time value of the current sensor and controlling the timing of the control unit, it prevents the battery from being damaged by excessive reverse charging current. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a block diagram of the utility model;

[0024] Figure 2 Schematic diagram of powering the battery pack;

[0025] Figure 3 Specific circuit diagram for powering the battery pack;

[0026] Figure 4 It is the structure diagram of voltage sampling circuit;

[0027] Figure 5 This is the communication circuit structure diagram. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] A single-output battery pack management system includes a control unit and at least two battery packs, each battery pack supplies power to a device through a control circuit;

[0030] The control circuit includes a parallel control circuit and a pre-charging circuit, and the voltage sampling circuit collects the battery pack voltage and sends it to the control unit;

[0031] The battery pack supplies power to the device through a control circuit; the control circuit includes a parallel control circuit and a pre-charge circuit;

[0032] The control 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 current flowing through the control circuit through the power tubes;

[0033] The pre-charging circuit has an electric control switch, and the control unit controls the shutdown of the pre-charging circuit through the electric control switch; the communication circuit collects the battery pack information and sends it to the control unit.

[0034] like Figures 1 to 5 As shown, for ease of explanation, two battery packs are used as an example.

[0035] A single output battery pack management system includes two battery packs, the two battery packs are battery pack B 1 and battery pack B 2 , battery pack B 1 With voltage sampling circuit E 1 , control circuit C 1 and communication circuit TA 1 ;

[0036] In battery pack B 1 and control circuit C 1 A current acquisition module CT1 is connected in series between the control circuit C 1 Including parallel connection in battery pack B 1 and the control circuit CA between the device M 1 And precharge circuit CB 1 , the control unit controls the control circuit CA 1 And precharge circuit CB 1 The disconnection.

[0037] Communication circuitTA 1 Collect battery pack B 1 The information is sent to the control unit;

[0038] Battery Pack B 2 With voltage sampling circuit E 2 , Control circuit C 2 and communication circuit TA 2 ;

[0039] Control circuit C 2 Including parallel connection in battery pack B 2 and the control circuit CA between the device M 2 And precharge circuit CB 2 , the control unit controls the control circuit CA 2 And precharge circuit CB 2 The disconnection.

[0040] Communication circuit TB 2 Collect battery pack B 2 The information is sent to the control unit;

[0041] Voltage sampling circuit E 2 With voltage sampling circuit E 1 , control circuit C 2 With control circuit C 1 , communication circuit TA 2 With communication circuit TA 1 The structures are consistent.

[0042] Control circuit CA 1 The MOS tube Q3 and the MOS tube Q4 are connected in series between the battery and the device. The source of the MOS tube Q3 is connected to the battery pack B. 1 The positive electrode of the MOS tube Q3 is connected to the drain of the MOS tube Q4, the gate of the MOS tube 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 of the control unit, the source of the MOS tube Q4 is connected to the input end of the device, the gate of the MOS tube Q4 is connected to the first end of the resistor R43, and the second end of the resistor R43 is connected to the second control port of the control unit.

[0043] Voltage sampling circuit E 1 It comprises a transistor G2, the emitter of the transistor G2 is grounded, one branch of the base of the transistor G2 is grounded via a resistor R58, and the other branch is connected to the fourth control port via a resistor R52.

[0044] The collector of the transistor G2 is connected to the gate of the MOS tube Q5 through the parallel resistors R53, R54, R55 and R56. The source of the MOS tube Q5 is connected to the sampling input port, which collects the battery pack B 1 Voltage;

[0045] The drain of the MOS tube Q5 is connected to the resistor R49 via the resistor R50, and the other end of the resistor R49 is connected to the sampling output port.

[0046] Battery Pack B 1 With communication port, communication circuit TA 1 It includes a MOS transistor Q7 and a MOS transistor Q8, wherein the gate of the MOS transistor Q7 is connected to the first end of a resistor R68, the second end of the resistor R68 is connected to the first end of a resistor R67, the second end of the resistor R67 is a first interactive port, the first interactive port communicates with the communication port, and a resistor R71 is bridged between the gate and the drain of the MOS transistor Q7;

[0047] The source of the MOS transistor Q7 is connected to the first end of the resistor R65, the second end of the resistor R65 is connected to the power supply, and the common end of the source of the MOS transistor Q7 and the resistor R65 is a first information receiving port;

[0048] The source of the MOS tube Q8 is connected to the common end of the resistor R67 and the resistor R68, the drain of the MOS tube Q8 is grounded, the gate of the MOS tube Q8 is connected to the first end of the resistor R73, the second end of the resistor R73 is the first information sending port, a resistor R74 is bridged between the gate and the drain of the MOS tube Q8, and the first information receiving port and the first information sending port are both connected to the control unit.

[0049] Voltage sampling circuit E 1 Collect battery pack B 1 The voltage V 1 Sent to the control unit, voltage sampling circuit E 2 Collect battery pack B 2 The voltage V 2 Sent to the control unit, the voltage V 1 and voltage V 2 Here, we assume that the voltage V 1 Greater than voltage V 2 ;

[0050] Here it is assumed that the control unit selects the maximum voltage V in the voltage data set a , voltage V a Equal to voltage V 1 , when the maximum voltage V a >Safety voltage threshold V S , the control unit is based on the maximum voltage V 1 Determine battery pack B 1 For power supply;

[0051] A pre-charge threshold is set, which corresponds to battery pack B 1 When the voltage of the capacitor in device M reaches the pre-charge threshold, the control unit shuts down battery pack B. 1 Precharge circuit CB 1 After that, the control unit turns on the battery pack B 1 The regulatory circuit CA 1 Provide secondary power supply to device M;

[0052] The control unit shuts down battery pack B 1 Precharge circuit CB 1 After that, the control unit turns on the battery pack B 1 The regulatory circuit CA 1 Provide secondary power supply to device M;

[0053] Communication circuitTA 1Collect battery pack B 1 The information is sent to the control unit;

[0054] Communication circuit TB 1 Collect battery pack B 2 The information is sent to the control unit;

[0055] When the control unit detects abnormal data in the battery pack, it will issue a command to shut down the output of the circuit. The communication circuit adopts a single-line communication method, which is converted into a serial port signal by a single communication line. The serial port signal is sent to the control circuit. The transmission information includes the voltage level, specification parameters, and discharge capacity information of the battery pack. The control unit detects the battery pack B in real time. 1 and battery pack B 2 The control unit will charge the battery pack B 1 With battery pack B 2 in parallel.

[0056] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0057] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A single output battery pack management system, characterized in that: It includes a control unit and at least two battery packs, each battery pack supplies power to the device through a control circuit; The control circuit includes a parallel control circuit and a pre-charging circuit, and the voltage sampling circuit collects the battery pack voltage and sends it to the control unit; The control circuit comprises a regulating circuit and a pre-charging circuit connected in parallel; The control 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 current flowing through the control circuit through the power tubes; The pre-charging circuit has an electric control switch, and the control unit controls the shut-off of the pre-charging circuit through the electric control switch; The communication circuit collects the battery pack information and sends it to the control unit.

2. A single output battery pack management system according to claim 1, characterized in that: The battery pack has a communication port, and the communication circuit includes a MOS tube Q7 and a MOS tube Q8. The gate of the MOS tube Q7 is connected to the first end of the resistor R68, and the second end of the resistor R68 is connected to the first end of the resistor R67. The second end of the resistor R67 is a first interactive port, and the first interactive port communicates with the communication port. A resistor R71 is connected between the gate and the drain of the MOS tube Q7. The source of the MOS transistor Q7 is connected to the first end of the resistor R65, the second end of the resistor R65 is connected to the power supply, and the common end of the source of the MOS transistor Q7 and the resistor R65 is a first information receiving port; The source of the MOS tube Q8 is connected to the common end of the resistor R67 and the resistor R68, the drain of the MOS tube Q8 is grounded, the gate of the MOS tube Q8 is connected to the first end of the resistor R73, the second end of the resistor R73 is the first information sending port, and a resistor R74 is bridged between the gate and the drain of the MOS tube Q8, and the first information receiving port and the first information sending port are both communicatively connected to the control unit.

3. According to claim 2, a single output battery pack management system is characterized in that: The control circuit includes a MOS tube Q3 and a MOS tube Q4 connected in series between the battery and the device, the source of the MOS tube Q3 is connected to the positive electrode of the battery pack, the drain of the MOS tube Q3 is connected to the drain of the MOS tube Q4, the gate of the MOS tube 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 of the control unit, the source of the MOS tube Q4 is connected to the input end of the device, the gate of the MOS tube Q4 is connected to the first end of the resistor R43, and the second end of the resistor R43 is connected to the second control port of the control unit.

4. A single output battery pack management system according to claim 3, characterized in that: The pre-charging circuit includes a transistor Q6 and a control switch K1, wherein the control switch K1 is used to control the opening and closing of the switch circuit, the base of the transistor Q6 is connected to the first end of the resistor R57, the second end of the resistor R57 is connected to the third control port of the control unit, a resistor R59 is bridged between the base and the emitter of the transistor Q6, the collector of the transistor Q6 is connected to the first control end of the control switch, and the second control end of the control switch is the output end.

5. A single output battery pack management system according to claim 4, characterized in that: The voltage sampling circuit includes a transistor G2, the emitter of the transistor G2 is grounded, one branch of the base of the transistor G2 is grounded via a resistor R58, and the other branch is connected to the fourth control port via a resistor R52; The collector of the transistor G2 is connected to the gate of the MOS transistor Q5 via the parallel resistors R53, R54, R55 and R56, and the source of the MOS transistor Q5 is connected to the sampling input port, which collects the corresponding battery pack voltage; The drain of the MOS tube Q5 is connected to the resistor R49 via the resistor R50, and the other end of the resistor R49 is connected to the sampling output port.

6. A single output battery pack management system according to claim 5, characterized in that: The sampling output port is grounded via a capacitor C47 and a resistor R51 connected in parallel.

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