Distributed series control circuit

Abstract

The utility model discloses a distributed series control circuit, and relates to the technical field of battery production equipment. The circuit comprises a battery switching circuit, a battery voltage acquisition circuit and a charging control signal circuit, the battery switching circuit is respectively connected with the battery voltage acquisition circuit, the charging control signal circuit and the multi-path battery pack; the battery switching circuit is used for completing state switching of different battery packs; the battery voltage acquisition circuit is used for acquiring the actual voltage of the battery and proportionally reducing the actual voltage of the battery to a voltage range which can be identified by the ADC; and the charging control signal circuit is used for acquiring multiple groups of expansion signals to perform logic control on an MOS tube in the battery switching circuit so as to complete state switching of multiple paths of batteries. According to the utility model, by arranging the battery switching circuit, series control can be respectively carried out on the battery packs arranged in different areas or different layers.

Description

Technical Field

[0001] The utility model relates to the technical field of battery production equipment, in particular to a distributed series control circuit. Background Art

[0002] In the existing lithium battery production field, the battery energy density is getting higher and higher, the single battery capacity is getting higher and higher, and the current of the equipment is also getting higher and higher. The proportion of battery production equipment costs is also getting higher and higher. The use of series charging in equipment has obvious help in battery consistency, reducing battery production costs, and improving charging efficiency. However, the general battery series connection method requires the batteries to be combined together, a tray module method, which cannot be promoted in actual use, and cannot be conveniently used for some distributed battery production methods. Therefore, it is necessary to develop a distributed series control circuit. Utility Model Content

[0003] The utility model aims to provide a distributed series control circuit, which can respectively control the battery packs arranged in different areas or different layers in series.

[0004] To achieve the above purpose, the utility model provides the following solutions:

[0005] A distributed series control circuit, comprising:

[0006] Battery switching circuit, battery voltage acquisition circuit and charging control signal circuit;

[0007] The battery switching circuit is respectively connected to the battery voltage acquisition circuit, the charging control signal circuit and the multi-channel battery pack;

[0008] The battery switching circuit is used to complete state switching of different battery packs;

[0009] The battery voltage acquisition circuit is used to acquire the actual battery voltage and proportionally reduce the actual battery voltage to a voltage range that can be recognized by the ADC;

[0010] The charging control signal circuit is used to obtain multiple groups of extended signals to perform logic control on the MOS tubes in the battery switching circuit to complete the state switching of multiple batteries.

[0011] Optionally, the states of the battery pack include: bidirectional input conduction charging and discharging, bidirectional bypass exit charging and discharging, forward conduction and reverse cutoff - short-time battery charging, and reverse conduction and forward cutoff - short-time battery discharging.

[0012] Optionally, the battery switching circuit includes:

[0013] MOS transistor Q1, MOS transistor Q2, MOS transistor Q3, MOS transistor Q4, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8 and a first battery;

[0014] The drain of the MOS transistor Q1 and the drain of the MOS transistor Q3 are connected as the I+ terminal of the battery switching circuit;

[0015] The gate of the MOS tube Q1, one end of the resistor R1 and one end of the resistor R2 are connected;

[0016] The other end of the resistor R1 serves as the EN1 end of the battery switching circuit and is connected to the charging control signal circuit;

[0017] The source of the MOS transistor Q1, the source of the MOS transistor Q2, the other end of the resistor R2 and one end of the resistor R4 are connected;

[0018] The gate of the MOS tube Q2, one end of the resistor R3 and the other end of the resistor R4 are connected;

[0019] The other end of the resistor R3 serves as the EN2 end of the battery switching circuit and is connected to the charging control signal circuit;

[0020] The drain of the MOS tube Q2 and the negative electrode of the first battery are connected to a multi-channel battery pack as the IA+ terminal of the battery switching circuit;

[0021] The gate of the MOS tube Q3, one end of the resistor R5 and one end of the resistor R6 are connected;

[0022] The other end of the resistor R5 serves as the EN3 end of the battery switching circuit;

[0023] The source of the MOS transistor Q3, the source of the MOS transistor Q4, the other end of the resistor R6 and one end of the resistor R8 are connected;

[0024] The gate of the MOS tube Q3, one end of the resistor R7 and the other end of the resistor R8 are connected;

[0025] The other end of the resistor R7 serves as the EN4 end of the battery switching circuit;

[0026] The drain of the MOS tube Q4 is connected to the positive electrode of the first battery;

[0027] The positive electrode of the first battery serves as the V1+ terminal of the battery switching circuit;

[0028] The negative electrode of the first battery serves as the V1- terminal of the battery switching circuit.

[0029] Optionally, the MOS transistor Q1 , the MOS transistor Q2 , the MOS transistor Q3 , and the MOS transistor Q4 are all N-type MOS transistors.

[0030] Optionally, the battery voltage acquisition circuit includes:

[0031] Chip U1, resistor R9, resistor R10, resistor R11, resistor R12, resistor R13, comparator U2-A and comparator U2-B;

[0032] The REFB terminal of the chip U1, the REFA terminal of the chip U1, one end of the resistor R11 and one end of the resistor R12 are all grounded;

[0033] The -IN terminal of the chip U1 serves as the V1+ terminal of the battery voltage acquisition circuit and is connected to the V1+ terminal of the battery switching circuit;

[0034] The +IN terminal of the chip U1 serves as the V1- terminal of the battery voltage acquisition circuit and is connected to the V1- terminal of the battery switching circuit;

[0035] The high level end of the chip U1 and the high level end of the comparator U2-A are both connected to a high level;

[0036] The low level end of the chip U1 and the low level end of the comparator U2-A are both connected to a high level;

[0037] The NC terminal of the chip U1 is disconnected;

[0038] The VOUT terminal of the chip U1 is connected to one end of the resistor R9;

[0039] The other end of the resistor R9 is connected to the positive input end of the comparator U2-A;

[0040] The negative input terminal of the comparator U2-A, the output terminal of the comparator U2-A and one end of the resistor R10 are connected;

[0041] The other end of the resistor R10 and the other end of the resistor R11 are connected to the positive input terminal of the comparator U2-B;

[0042] The negative input terminal of the comparator U2-B, the other end of the resistor R12, and one end of the resistor R13 are connected;

[0043] The other end of the resistor R13 and the output end of the comparator U2-B serve as the BV1 end of the battery voltage acquisition circuit.

[0044] Optionally, the charging control signal circuit includes:

[0045] Chip U3, chip U4, resistor R14, resistor R15, resistor R16 and resistor R17;

[0046] The VDD terminal of the chip U3 is connected to VCC;

[0047] The RESET terminal of the chip U3 is connected to VCC, the 2nd pin of the chip U4, the 4th pin of the chip U4, the 6th pin of the chip U4 and the 8th pin of the chip U4 are all grounded;

[0048] The DATA terminal of the chip U3 is used to input DATA;

[0049] The WR-DIS terminal of the chip U3 is used to input WR-DIS;

[0050] The RESET terminal of the chip A0 is used for inputting current A0;

[0051] The RESET terminal of the chip A1 is used for inputting current A1;

[0052] The RESET terminal of the chip A2 is used for inputting current A2;

[0053] The Q0 terminal in the chip U3 is connected to one end of the resistor R14;

[0054] The Q1 terminal in the chip U3 is connected to one end of the resistor R15;

[0055] The Q2 terminal in the chip U3 is connected to one end of the resistor R16;

[0056] The Q3 terminal in the chip U3 is connected to one end of the resistor R17;

[0057] The Q4 terminal in the chip U3, the Q5 terminal in the chip U3, the Q6 terminal in the chip U3 and the Q7 terminal in the chip U3 are all disconnected;

[0058] The other end of the resistor R14 is connected to pin 1 of the chip U4;

[0059] The other end of the resistor R15 is connected to pin 2 of the chip U4;

[0060] The other end of the resistor R16 is connected to pin 3 of the chip U4;

[0061] The other end of the resistor R17 is connected to pin 4 of the chip U4;

[0062] Pin 10 of the chip U4, pin 12 of the chip U4, pin 14 of the chip U4 and pin 16 of the chip U4 are all connected to VDD;

[0063] Pin 15 of the chip U4 is used as the EN1 terminal of the charging control signal circuit and is connected to the EN1 terminal of the battery switching circuit;

[0064] Pin 13 of the chip U4 is used as the EN2 terminal of the charging control signal circuit and is connected to the EN2 terminal of the battery switching circuit;

[0065] Pin 11 of the chip U4 serves as the EN3 terminal of the charging control signal circuit;

[0066] Pin 9 of the chip U4 serves as the EN4 terminal of the charging control signal circuit.

[0067] According to the specific embodiments provided by the utility model, the utility model discloses the following technical effects:

[0068] The utility model provides a distributed series control circuit, including a battery switching circuit, a battery sampling circuit, a series charging control signal, an MCU control part and a power supply. Each group of distributed series control circuits can charge and discharge 1-8 batteries in series, and each group of distributed control circuits is connected through a 485 communication line. The battery voltage and other status information collected by each group of control circuits are transmitted to the main control intermediate machine through 485 communication. The intermediate machine controls each group of switching circuits to switch to different states by comparing parameters. Each group controls 8 batteries, which can be independently distributed in different probe boxes, or distributed in different layers or needle beds, reducing the connection of cables to form modules. Each module is completely independent and easy to maintain, and is not limited to all control signals and control circuits concentrated in one location. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0070] Figure 1 A distributed series control circuit diagram provided in Example 1 of the utility model;

[0071] Figure 2 A battery switching circuit diagram provided for Example 1 of the utility model;

[0072] Figure 3 A battery voltage acquisition circuit diagram provided in Example 1 of the utility model;

[0073] Figure 4 This is a charging control signal circuit diagram provided in Example 1 of the utility model. DETAILED DESCRIPTION

[0074] 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.

[0075] The utility model aims to provide a distributed series control circuit, which can respectively control the battery packs arranged in different areas or different layers in series.

[0076] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0077] Example 1

[0078] like Figure 1 As shown, a distributed series control circuit in this embodiment includes:

[0079] Battery switching circuit, battery voltage acquisition circuit and charging control signal circuit.

[0080] The battery switching circuit is respectively connected with the battery voltage acquisition circuit, the charging control signal circuit and the multi-channel battery pack.

[0081] The battery switching circuit is used to complete the state switching of different battery packs.

[0082] The battery voltage acquisition circuit is used to collect the actual battery voltage and proportionally reduce the actual battery voltage to a voltage range that can be recognized by the ADC.

[0083] The charging control signal circuit is used to obtain multiple groups of extended signals to perform logical control on the MOS tubes in the battery switching circuit to complete the state switching of multiple batteries.

[0084] Among them, the states of the battery pack include: bidirectional input conduction charging and discharging, bidirectional bypass exit charging and discharging, forward conduction and reverse cutoff - short-time battery charging and reverse conduction and forward cutoff - short-time battery discharging.

[0085] like Figure 2 , the battery switching circuit includes:

[0086] MOS transistor Q1, MOS transistor Q2, MOS transistor Q3, MOS transistor Q4, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8 and a first battery.

[0087] The drain of the MOS transistor Q1 and the drain of the MOS transistor Q3 are connected to serve as the I+ terminal of the battery switching circuit.

[0088] The gate of the MOS tube Q1, one end of the resistor R1 and one end of the resistor R2 are connected.

[0089] The other end of the resistor R1 serves as the EN1 end of the battery switching circuit and is connected to the charging control signal circuit.

[0090] The source of the MOS transistor Q1 , the source of the MOS transistor Q2 , the other end of the resistor R2 , and one end of the resistor R4 are connected.

[0091] The gate of the MOS tube Q2, one end of the resistor R3 and the other end of the resistor R4 are connected.

[0092] The other end of the resistor R3 serves as the EN2 end of the battery switching circuit and is connected to the charging control signal circuit.

[0093] The drain of the MOS tube Q2 and the negative electrode of the first battery are connected to the multi-channel battery group as the IA+ terminal of the battery switching circuit.

[0094] The gate of the MOS tube Q3, one end of the resistor R5 and one end of the resistor R6 are connected.

[0095] The other end of the resistor R5 serves as the EN3 end of the battery switching circuit.

[0096] The source of the MOS transistor Q3, the source of the MOS transistor Q4, the other end of the resistor R6, and one end of the resistor R8 are connected.

[0097] The gate of the MOS tube Q3, one end of the resistor R7 and the other end of the resistor R8 are connected.

[0098] The other end of the resistor R7 serves as the EN4 end of the battery switching circuit.

[0099] The drain of the MOS tube Q4 is connected to the positive electrode of the first battery.

[0100] The positive electrode of the first battery serves as the V1+ terminal of the battery switching circuit.

[0101] The negative electrode of the first battery serves as the V1- terminal of the battery switching circuit.

[0102] Among them, the MOS tube Q1, the MOS tube Q2, the MOS tube Q3 and the MOS tube Q4 are all N-type MOS tubes.

[0103] like Figure 3 , the battery voltage acquisition circuit includes:

[0104] Chip U1, resistor R9, resistor R10, resistor R11, resistor R12, resistor R13, comparator U2-A and comparator U2-B.

[0105] The REFB terminal of the chip U1 , the REFA terminal of the chip U1 , one end of the resistor R11 , and one end of the resistor R12 are all grounded.

[0106] The -IN terminal of the chip U1 serves as the V1+ terminal of the battery voltage acquisition circuit and is connected to the V1+ terminal of the battery switching circuit.

[0107] The +IN terminal of the chip U1 serves as the V1- terminal of the battery voltage acquisition circuit and is connected to the V1- terminal of the battery switching circuit.

[0108] The high level end of the chip U1 and the high level end of the comparator U2-A are both connected to a high level.

[0109] The low level end of the chip U1 and the low level end of the comparator U2-A are both connected to a high level.

[0110] The NC terminal of chip U1 is open circuit.

[0111] The VOUT terminal of the chip U1 is connected to one end of the resistor R9.

[0112] The model of chip U1 is INA149.

[0113] The other end of the resistor R9 is connected to the positive input terminal of the comparator U2-A.

[0114] The negative input terminal of the comparator U2-A, the output terminal of the comparator U2-A and one end of the resistor R10 are connected.

[0115] The other end of the resistor R10 and the other end of the resistor R11 are connected to the positive input terminal of the comparator U2-B.

[0116] The negative input terminal of the comparator U2-B, the other end of the resistor R12, and one end of the resistor R13 are connected.

[0117] The other end of the resistor R13 and the output end of the comparator U2-B serve as the BV1 end of the battery voltage acquisition circuit.

[0118] like Figure 4 , the charging control signal circuit includes:

[0119] Chip U3, chip U4, resistor R14, resistor R15, resistor R16 and resistor R17.

[0120] The VDD terminal of chip U3 is connected to VCC.

[0121] The RESET terminal of chip U3 is connected to VCC, and pin 2 of chip U4, pin 4 of chip U4, pin 6 of chip U4 and pin 8 of chip U4 are all grounded.

[0122] The DATA terminal of chip U3 is used to input DATA.

[0123] The WR-DIS terminal of chip U3 is used to input WR-DIS.

[0124] The RESET terminal of chip A0 is used to input current A0.

[0125] The RESET terminal of chip A1 is used for inputting current A1.

[0126] The RESET terminal of chip A2 is used for inputting current A2.

[0127] The Q0 terminal in the chip U3 is connected to one end of the resistor R14.

[0128] The Q1 terminal in the chip U3 is connected to one end of the resistor R15.

[0129] The Q2 terminal in the chip U3 is connected to one end of the resistor R16.

[0130] The Q3 terminal in the chip U3 is connected to one end of the resistor R17.

[0131] The Q4 terminal in the chip U3, the Q5 terminal in the chip U3, the Q6 terminal in the chip U3 and the Q7 terminal in the chip U3 are all open circuited.

[0132] The model of chip U3 is CD4099BM.

[0133] The other end of the resistor R14 is connected to pin 1 of the chip U4.

[0134] The other end of the resistor R15 is connected to pin 2 of the chip U4.

[0135] The other end of the resistor R16 is connected to pin 3 of the chip U4.

[0136] The other end of the resistor R17 is connected to pin 4 of the chip U4.

[0137] Pin 10 of chip U4, pin 12 of chip U4, pin 14 of chip U4 and pin 16 of chip U4 are all connected to VDD.

[0138] Pin 15 of chip U4 serves as the EN1 terminal of the charging control signal circuit and is connected to the EN1 terminal of the battery switching circuit.

[0139] Pin 13 of chip U4 serves as the EN2 terminal of the charging control signal circuit and is connected to the EN2 terminal of the battery switching circuit.

[0140] Pin 11 of chip U4 serves as the EN3 terminal of the charging control signal circuit.

[0141] Pin 9 of chip U4 serves as the EN4 terminal of the charging control signal circuit.

[0142] The model of chip U4 is TLP281-4.

[0143] The distributed series control circuit includes: battery switching circuit, battery voltage acquisition circuit, series charging control circuit and MCU master control unit; the total current input end of the battery switching circuit is connected to the positive pole of the series power supply, and the output end is connected to the next channel of the series circuit. Each battery switching circuit part controls the switching of up to 8 batteries. The battery switching circuit is the final execution circuit, which can individually control any battery in the entire group to be cut out of the bypass or cut in the series of the series battery group, and achieve non-contact continuous flow, without affecting the total series circuit. Based on high-voltage DC / DC power supply, it adapts to distributed series formation technology, while reducing the number of formation power supplies, improving the consistency of batteries. The main circuit circuit and battery switching circuit, battery sampling circuit, series charging control signal, the main circuit circuit includes a DC / DC power module, the maximum output voltage of the module is 100V, the maximum output current is 200A, and the maximum is 4 channels; the main circuit single channel can carry up to 24 single cells in series charging, and the 4 channels can support up to 96 single cells in 4 groups of series charging, and the respective series battery switching circuits are connected in series to the positive and negative poles of the 4-way DC / DC power module in sequence.

[0144] The novel battery switching circuit has two control electrodes, X and Y. By controlling the two control electrodes, four states of bidirectional conduction, bidirectional bypass, forward conduction and reverse cutoff, and reverse conduction and forward cutoff can be realized for a single battery.

[0145] The two ends of the single battery and the two ends of the series battery switching circuit are connected to the series charging control signal circuit. The control signal circuit adopts the optocoupler isolation mode, and uses low-voltage isolation to control the high-voltage MOS tube to switch different states, so as to achieve the purpose of multiple battery charging voltage abnormalities or full voltage control to cut out the series circuit. When the single battery voltage is abnormal or full, it is necessary to use the battery voltage acquisition circuit to realize high-precision real-time acquisition of each battery voltage, as well as the switching circuit battery port voltage acquisition, and report the battery voltage to the MCU main control circuit to complete the judgment of the working charging state and fault judgment of the single battery, as well as the logic processing and interlocking of the control signal. The battery voltage acquisition circuit receives the battery voltage and battery switching switch voltage information, performs fault judgment and control on the working state of the battery, and drives the series battery switching circuit to switch between 4 states after logical processing and interlocking of the signal, ensuring reliable triggering of battery conduction charging and discharging, bidirectional bypass to stop charging and discharging, forward conduction reverse cutoff and reverse conduction forward cutoff state switching. The switching process is judged by the control signal timing logic, which will not cause the interruption of charging and discharging current, nor will it cause the positive and negative poles of the battery to short-circuit. The input and bypass exit of the series-connected single battery are realized. During the series charging and discharging process, while ensuring that the current is not interrupted, the input or output of a battery will not affect the normal operation of other batteries.

[0146] like Figure 1 This embodiment includes: a zone 1 battery switching circuit, a zone 2 battery voltage acquisition circuit, a zone 3 charging control signal circuit, and N groups (1-8) of circuits.

[0147] Battery switching circuit such as Figure 2 , composed of 4 state switch main circuit schematic diagram; Figure 2 The I+ in the middle is connected to the 100V positive pole of the AC / DC total power supply in the main circuit. Through the logic control of Q1~Q4 MOS tubes, it can complete the switching of four states of bidirectional input conduction charging and discharging of a single battery (Q1, Q2 are turned off, Q3, Q4 are turned on), bidirectional bypass exit charging and discharging (Q1, Q2 are turned on, Q3, Q4 are turned off), forward conduction and reverse cut-off battery short-time charging (Q1, Q2, Q4 are turned off, Q3 is turned on), and reverse conduction and forward cut-off battery short-time discharge (Q1, Q2, Q3 are turned off, Q4 is turned on), ensuring that the battery does not affect the operation of the main circuit when the battery is switched on and off.

[0148] Battery voltage acquisition circuit Figure 3U1 is a high common-mode differential op amp, which is mainly used to directly connect to both ends of the battery. Because the voltage of the series circuit is up to 100V, it cannot be directly collected by ordinary op amps. The use of high common-mode op amps can collect the actual battery voltage with high precision. U2 is a dual op amp chip. U2-A is used as a follower circuit to improve the output load capacity of the differential op amp. U2-B is used as a step-down circuit to proportionally reduce the collected battery voltage to the voltage range that the ADC can recognize for the MCU to judge.

[0149] The control principle is as follows Figure 4 Among them, U3 is the MCU low voltage control signal expansion chip, which is connected to the MCU bus through a trigger and separated.

[0150] This article uses specific examples to illustrate the principle and implementation of the utility model. The above examples are only used to help understand the structure and core idea of ​​the utility model. At the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A distributed series control circuit, characterized in that: include: Battery switching circuit, battery voltage acquisition circuit and charging control signal circuit; The battery switching circuit is respectively connected to the battery voltage acquisition circuit, the charging control signal circuit and the multi-channel battery pack; The battery switching circuit is used to complete state switching of different battery packs; The battery voltage acquisition circuit is used to acquire the actual battery voltage and proportionally reduce the actual battery voltage to a voltage range that can be recognized by the ADC; The charging control signal circuit is used to obtain multiple groups of extended signals to perform logic control on the MOS tubes in the battery switching circuit to complete the state switching of multiple batteries.

2. A distributed series control circuit according to claim 1, characterized in that: The states of the battery pack include: bidirectional input conduction charging and discharging, bidirectional bypass exit charging and discharging, forward conduction and reverse cutoff - short-time battery charging and reverse conduction and forward cutoff - short-time battery discharging.

3. A distributed series control circuit according to claim 1, characterized in that: The battery switching circuit comprises: MOS transistor Q1, MOS transistor Q2, MOS transistor Q3, MOS transistor Q4, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6, resistor R7, resistor R8 and a first battery; The drain of the MOS transistor Q1 and the drain of the MOS transistor Q3 are connected as the I+ terminal of the battery switching circuit; The gate of the MOS tube Q1, one end of the resistor R1 and one end of the resistor R2 are connected; The other end of the resistor R1 serves as the EN1 end of the battery switching circuit and is connected to the charging control signal circuit; The source of the MOS transistor Q1, the source of the MOS transistor Q2, the other end of the resistor R2 and one end of the resistor R4 are connected; The gate of the MOS tube Q2, one end of the resistor R3 and the other end of the resistor R4 are connected; The other end of the resistor R3 serves as the EN2 end of the battery switching circuit and is connected to the charging control signal circuit; The drain of the MOS tube Q2 and the negative electrode of the first battery are connected to a multi-channel battery pack as the IA+ terminal of the battery switching circuit; The gate of the MOS tube Q3, one end of the resistor R5 and one end of the resistor R6 are connected; The other end of the resistor R5 serves as the EN3 end of the battery switching circuit; The source of the MOS transistor Q3, the source of the MOS transistor Q4, the other end of the resistor R6 and one end of the resistor R8 are connected; The gate of the MOS tube Q3, one end of the resistor R7 and the other end of the resistor R8 are connected; The other end of the resistor R7 serves as the EN4 end of the battery switching circuit; The drain of the MOS tube Q4 is connected to the positive electrode of the first battery; The positive electrode of the first battery serves as the V1+ terminal of the battery switching circuit; The negative electrode of the first battery serves as the V1- terminal of the battery switching circuit.

4. A distributed series control circuit according to claim 3, characterized in that: The MOS transistor Q1 , the MOS transistor Q2 , the MOS transistor Q3 and the MOS transistor Q4 are all N-type MOS transistors.

5. A distributed series control circuit according to claim 3, characterized in that: The battery voltage acquisition circuit comprises: Chip U1, resistor R9, resistor R10, resistor R11, resistor R12, resistor R13, comparator U2-A and comparator U2-B; The REFB terminal of the chip U1, the REFA terminal of the chip U1, one end of the resistor R11 and one end of the resistor R12 are all grounded; The -IN terminal of the chip U1 serves as the V1+ terminal of the battery voltage acquisition circuit and is connected to the V1+ terminal of the battery switching circuit; The +IN terminal of the chip U1 serves as the V1- terminal of the battery voltage acquisition circuit and is connected to the V1- terminal of the battery switching circuit; The high level end of the chip U1 and the high level end of the comparator U2-A are both connected to a high level; The low level end of the chip U1 and the low level end of the comparator U2-A are both connected to a high level; The NC terminal of the chip U1 is disconnected; The VOUT terminal of the chip U1 is connected to one end of the resistor R9; The other end of the resistor R9 is connected to the positive input end of the comparator U2-A; The negative input terminal of the comparator U2-A, the output terminal of the comparator U2-A and one end of the resistor R10 are connected; The other end of the resistor R10 and the other end of the resistor R11 are connected to the positive input terminal of the comparator U2-B; The negative input terminal of the comparator U2-B, the other end of the resistor R12, and one end of the resistor R13 are connected; The other end of the resistor R13 and the output end of the comparator U2-B serve as the BV1 end of the battery voltage acquisition circuit.

6. A distributed series control circuit according to claim 5, characterized in that: The charging control signal circuit comprises: Chip U3, chip U4, resistor R14, resistor R15, resistor R16 and resistor R17; The VDD terminal of the chip U3 is connected to VCC; The RESET terminal of the chip U3 is connected to VCC, the 2nd pin of the chip U4, the 4th pin of the chip U4, the 6th pin of the chip U4 and the 8th pin of the chip U4 are all grounded; The DATA terminal of the chip U3 is used to input DATA; The WR-DIS terminal of the chip U3 is used to input WR-DIS; The RESET terminal of the chip A0 is used for inputting current A0; The RESET terminal of the chip A1 is used for inputting current A1; The RESET terminal of the chip A2 is used for inputting current A2; The Q0 terminal in the chip U3 is connected to one end of the resistor R14; The Q1 terminal in the chip U3 is connected to one end of the resistor R15; The Q2 terminal in the chip U3 is connected to one end of the resistor R16; The Q3 terminal in the chip U3 is connected to one end of the resistor R17; The Q4 terminal in the chip U3, the Q5 terminal in the chip U3, the Q6 terminal in the chip U3 and the Q7 terminal in the chip U3 are all disconnected; The other end of the resistor R14 is connected to pin 1 of the chip U4; The other end of the resistor R15 is connected to pin 2 of the chip U4; The other end of the resistor R16 is connected to pin 3 of the chip U4; The other end of the resistor R17 is connected to pin 4 of the chip U4; Pin 10 of the chip U4, pin 12 of the chip U4, pin 14 of the chip U4 and pin 16 of the chip U4 are all connected to VDD; Pin 15 of the chip U4 is used as the EN1 terminal of the charging control signal circuit and is connected to the EN1 terminal of the battery switching circuit; Pin 13 of the chip U4 is used as the EN2 terminal of the charging control signal circuit and is connected to the EN2 terminal of the battery switching circuit; Pin 11 of the chip U4 serves as the EN3 terminal of the charging control signal circuit; Pin 9 of the chip U4 serves as the EN4 terminal of the charging control signal circuit.

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