Multi-output battery pack management device

Abstract

A multi-output battery pack management device comprises a battery pack, the battery pack is provided with at least one control circuit, and each control circuit is correspondingly connected with a set of equipment. 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 current regulation and control circuit comprises power tubes connected in series, and the 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 electric control switches which are connected in series, and the control unit controls the on-off of the pre-charging circuit through the electric control switches. A plurality of battery packs are connected, each battery pack independently supplies power to one set of equipment, the discharge current and capacity requirements of the single battery pack are reduced, and when the voltage of the connected battery packs is reduced to be similar, the device enables the battery packs to be naturally connected in parallel, so that the service life of a product is prolonged, and the reusability of the existing battery packs is improved.

Description

Technical Field

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

[0002] With the widespread use of lithium battery packs in garden machinery, the power demand of the equipment is getting bigger and bigger, and the power consumption of the equipment continues to increase. A single battery pack cannot meet the high power demand. At present, the following two solutions are mainly used: 1. Multiple battery packs of the same voltage level are connected in parallel. This technology has the risk of circulating current and damages the battery pack. It requires special technical processing, which is complicated and costly. 2. Multiple battery packs are connected, and each battery pack has multiple outputs. This technology has high requirements on battery capacity. If multiple high-power electrical equipment is used at the same time, the discharge current of a single battery pack is very large. The battery pack is directly connected to the electrical equipment through a relay. When the power is supplied, the relay is closed to transmit power, which causes electric shock and burns over time.

[0003] Therefore, in order to overcome the above disadvantages, a multi-output battery pack management device is needed. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model proposes a dual-output battery pack management device, a multi-output battery pack management device, including a battery pack, characterized in that:

[0005] The battery pack has at least one control circuit, and each control circuit is connected to a group of devices;

[0006] The battery pack supplies power to the device through the control circuit;

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

[0008] The current 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;

[0009] The control unit controls the magnitude of the current flowing through the regulating circuit through the power tube;

[0010] 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.

[0011] Furthermore: each group of the battery packs has N groups of control circuits, and the N groups of control circuits are electrically connected to N groups of devices in a one-to-one correspondence, and N≧2.

[0012] Further: the current control circuit includes a MOS tube Q9 and a MOS tube Q10 connected in series between the battery and the device, the drain of the MOS tube Q9 is connected to the positive electrode of the battery, the source of the MOS tube Q9 is connected to the source of the MOS tube Q10, the gate of the MOS tube Q9 is connected to the first end of the resistor R60, the second end of the resistor R60 is connected to the first control port, the drain of the MOS tube Q10 is connected to the input end of the device, the gate of the MOS tube Q10 is connected to the first end of the resistor R59, the second end of the resistor R59 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.

[0013] Further: the pre-charging circuit includes a transistor Q12 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 Q12 is connected to the first end of the resistor R76, the second end of the resistor R76 is connected to the second control port, a resistor R77 is bridged between the base and the emitter of the transistor Q12, the collector of the transistor Q12 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.

[0014] Furthermore: 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 R75, and the other branch is connected to the third control port via a resistor R70.

[0015] The collector of the transistor G2 is connected to the gate of the MOS transistor Q11 via the parallel resistors R71, R72, R73 and R74, and the source of the MOS transistor Q11 is connected to the sampling input port, which collects the corresponding battery pack voltage;

[0016] The drain of the MOS tube Q11 is connected to the resistor R67 via the resistor R68, and the other end of the resistor R67 is connected to the sampling output port.

[0017] Furthermore: the sampling output port is grounded via a capacitor C61 and a resistor R69 connected in parallel.

[0018] The beneficial effects of the utility model are as follows: multiple battery packs are connected, and each group of battery packs independently supplies power to a group of equipment, thereby reducing the discharge current and capacity requirements of a single battery pack; when the voltages of the connected battery packs are reduced to a similar level, the device naturally connects the battery packs in parallel, thereby extending the service life of the product and increasing the reusability of existing battery packs.

[0019] Each circuit is equipped with primary power supply and secondary power supply to protect the BMS protection board of the battery, so as to prevent the output from being cut off after the current value of the battery pack exceeds the BMS protection board. The pre-charging circuit initially supplies a small current to the equipment, and then starts the high-power supply of the regulation circuit after it meets the requirements of the BMS protection board, so as to better protect the battery pack and increase the life of components. When the battery pack power is close, the overall power supply of the battery pack can be used longer after being connected in parallel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic block diagram of the utility model;

[0021] Figure 2 This is a circuit structure diagram of the utility model;

[0022] Figure 3 For battery pack B1, control circuit C 11 , control circuit C 12 , the specific circuit connection between device M1 and device M2;

[0023] Figure 4 This is the structure diagram of the voltage acquisition circuit. DETAILED DESCRIPTION

[0024] 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.

[0025] A specific technical solution of a multi-output battery pack management device is as follows:

[0026] A multi-output battery pack management device includes a battery pack, each battery pack has N control circuits, and the N control circuits are electrically connected to N devices in a one-to-one correspondence, where N≧2.

[0027] The battery pack supplies power to the device through the control circuit; the control circuit includes a regulation circuit and a pre-charging circuit connected in parallel;

[0028] The current 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;

[0029] 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.

[0030] like Figure 1 and Figure 2 As shown, for the sake of convenience, two battery packs and two equipment groups are used as an example. Specifically, each battery pack has two control circuits, and the two control circuits are electrically connected to the two equipment groups in a one-to-one correspondence.

[0031] A multi-output battery pack management device includes two battery packs and equipment, the two battery packs are battery pack B1 and battery pack B2, and battery pack B1 has a voltage acquisition circuit E1 and a control circuit C 11 and control circuit C 12 ;

[0032] Control circuit C 11 It includes a control circuit CA connected in parallel between the battery pack B1 and the device M1 11 And precharge circuit CB 11 , the control unit controls the control circuit CA 11 And precharge circuit CB 11 The disconnection.

[0033] Control circuit C 12 It includes a control circuit CA connected in parallel between the battery pack B1 and the device M1 12 And precharge circuit CB 12 , the control unit controls the control circuit CA 12 And precharge circuit CB 12 The disconnection.

[0034] Battery pack B2, battery pack B2 has voltage collection circuit E2, control circuit C 21 And control circuit C 22 ;

[0035] Control circuit C 21 A control circuit CA connected in parallel between the battery pack B2 and the device M2 21 And precharge circuit CB 21 , the control unit controls the control circuit CA 21 And precharge circuit CB 21 The disconnection.

[0036] Control circuit C 22 A control circuit CA connected in parallel between the battery pack B2 and the device M2 22 And precharge circuit CB 22 , the control unit controls the control circuit CA 22 And precharge circuit CB 22 The disconnection.

[0037] like Figure 3 As shown, the battery pack B1, the voltage acquisition circuit E1, and the control circuit C 11 , control circuit C 12 The specific circuit connection between the device M1 is explained.

[0038] Control circuit CA 11 It includes a MOS tube Q9 and a MOS tube Q10 connected in series between the battery pack B1 and the device M1, the drain of the MOS tube Q9 is connected to the positive electrode of the battery pack B1, the source of the MOS tube Q9 is connected to the source of the MOS tube Q10, the gate of the MOS tube Q9 is connected to the first end of the resistor R60, the second end of the resistor R60 is connected to the first control port, the drain of the MOS tube Q10 is connected to the input end of the device M1, the gate of the MOS tube Q10 is connected to the first end of the resistor R59, the second end of the resistor R59 is connected to the first control port, and the control unit sends a corresponding control signal to the first control port.

[0039] Precharge circuit CB 11 It includes a transistor Q12 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 Q12 is connected to the first end of the resistor R76, the second end of the resistor R76 is connected to the second control port, and the control unit sends a corresponding control signal to the second control port. A resistor R77 is connected between the base and the emitter of the transistor Q12, the collector of the transistor Q12 is connected to the first control end of the control switch, and the second control end of the control switch is connected to the auxiliary voltage, which is 12V.

[0040] like Figure 4 As shown, the voltage acquisition circuit E1 includes a transistor G2, the emitter of which is grounded, one branch of the base of which is grounded via a resistor R75, and the other branch is connected to the third control port via a resistor R70. The control unit sends a corresponding control signal to the third control port, and the control unit controls the voltage acquisition circuit E1 to work via the third control port.

[0041] The collector of the transistor G2 is connected to the gate of the MOS transistor Q11 via resistors R71, R72, R73 and R74 connected in parallel. The source of the MOS transistor Q11 is connected to a sampling input port, which collects the working voltage of the battery pack B1.

[0042] The drain of the MOS tube Q11 is connected to the resistor R67 via the resistor R68, and the other end of the resistor R67 is connected to the sampling output port. The sampling output port is grounded via the capacitor C61 and the resistor R69 connected in parallel.

[0043] A management method for a multi-output battery pack management device includes N groups of battery packs and equipment, for a battery pack B in the N groups of battery packs i , battery pack B i A voltage collection circuit E is provided. i and N groups of control circuits C ij, N group of control circuits are control circuit C i1 To control circuit C iN , N≧2, N>i, j>1;

[0044] The control circuit C ij Including control circuit CA ij And precharge circuit CB ij ;

[0045] The control unit controls the control circuit CA ij And precharge circuit CB ij The opening and closing of

[0046] For ease of understanding, two battery packs and devices are used for illustration, and N is 2.

[0047] The steps include:

[0048] S1: For battery pack B in 2 battery packs i , voltage acquisition circuit E i Collect battery pack B i The voltage v i Sent to the control unit, 2>i>1, specifically, the voltage acquisition circuit E1 acquires the voltage v1 of the battery pack B1 and sends it to the control unit, and the voltage acquisition circuit E2 acquires the voltage v2 of the battery pack B2 and sends it to the control unit. Here, it is assumed that v2 <v1;

[0049] S2: When the voltages of B1 and B2 are consistent, enter S7, otherwise enter S3;

[0050] S3: The control unit sorts the collected voltages from small to large to obtain a voltage sequence set V = (V1, V2), where V1 = v2, V2 = v1, and if v2>v1, V1 = v1, V2 = v1;

[0051] S4: The control unit obtains a corresponding battery pack sequence set B=(B1, B2) according to the voltage sequence;

[0052] S5: The control unit unidirectionally sorts the device power according to the sorting direction consistent with the voltage sequence set V, and obtains the corresponding device sequence set M = (M1, M2);

[0053] S6: The control unit turns on the pre-charge circuit CB of the battery pack B1 11 Provide primary power to device M1;

[0054] A pre-charge threshold is set, which corresponds to 70% of the voltage of the battery pack B1. When the voltage of the capacitor in the device M1 reaches the pre-charge threshold, the control unit shuts off the pre-charge circuit CB of the battery pack B1. 11 After that, the control unit turns on the control circuit CA of the battery pack B1.11 Provide secondary power supply to device M1;

[0055] The control unit turns on the pre-charge circuit CB of the battery pack B2 22 Provide primary power supply to device M2;

[0056] A pre-charge threshold is set, which corresponds to 70% of the voltage of battery pack B2. When the voltage of the capacitor in device M2 reaches the pre-charge threshold, the control unit shuts off the pre-charge circuit CB of battery pack B2. 22 After that, the control unit turns on the control circuit CA of the battery pack B2. 22 Provide secondary power to device M2.

[0057] S7: When the voltages of B1 and B2 are close, battery pack 1 and B2 are connected in parallel to turn on the regulation circuit to supply power to M1 and device M2.

[0058] 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.

[0059] 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 multi-output battery pack management device, comprising a battery pack, characterized in that: The battery pack has at least one control circuit, and each control circuit is connected to a group of devices; The battery pack supplies power to the device through the control circuit; The control circuit comprises a regulating circuit and a pre-charging circuit connected in parallel; The control circuit includes a power tube connected in series, and the power tube is connected in series between the battery pack and the device; The control unit controls the magnitude of the current flowing through the regulating circuit through the power tube; The pre-charging circuit has an electronically controlled switch connected in series, and the control unit controls the shut-off of the pre-charging circuit through the electronically controlled switch.

2. A multi-output battery pack management device according to claim 1, characterized in that: Each group of the battery packs has N groups of control circuits, and the N groups of control circuits are electrically connected to N groups of devices in a one-to-one correspondence, and N≧2.

3. A multi-output battery pack management device according to claim 2, characterized in that: The control circuit includes a MOS transistor Q9 and a MOS transistor Q10 connected in series between the battery and the device, the drain of the MOS transistor Q9 is connected to the positive electrode of the battery, the source of the MOS transistor Q9 is connected to the source of the MOS transistor Q10, the gate of the MOS transistor Q9 is connected to the first end of the resistor R60, the second end of the resistor R60 is connected to the first control port, the drain of the MOS transistor Q10 is connected to the input end of the device, the gate of the MOS transistor Q10 is connected to the first end of the resistor R59, the second end of the resistor R59 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.

4. A multi-output battery pack management device according to claim 3, characterized in that: The pre-charging circuit includes a transistor Q12 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 Q12 is connected to the first end of the resistor R76, the second end of the resistor R76 is connected to the second control port, a resistor R77 is bridged between the base and the emitter of the transistor Q12, the collector of the transistor Q12 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.

5. A multi-output battery pack management device 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 R75, and the other branch is connected to the third control port via a resistor R70; The collector of the transistor G2 is connected to the gate of the MOS transistor Q11 via the resistors R71, R72, R73 and R74 connected in parallel, and the source of the MOS transistor Q11 is connected to the sampling input port, which collects the corresponding battery pack voltage; The drain of the MOS tube Q11 is connected to the resistor R67 via the resistor R68, and the other end of the resistor R67 is connected to the sampling output port.

6. A multi-output battery pack management device according to claim 5, characterized in that: The sampling output port is grounded via a capacitor C61 and a resistor R69 connected in parallel.

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