Battery management system for parallel charging

Abstract

The utility model relates to the technical field of lithium battery management, and discloses a parallel charging battery management system, which comprises a front-end acquisition module, a master control module and a switch array module, the switch array module is connected between a battery pack and a charging port, the front-end acquisition module is connected with the battery pack, and the master control module is connected with the switch array module. The main control module is connected with the switch array module and the front-end acquisition module, the switch array module comprises a plurality of switch loops, one switch loop comprises a mos transistor Q1, a mos transistor Q2 and a mos transistor N1, the mos transistor Q1 and the mos transistor Q2 are connected in series between a B3 end and a C3 end, and grid electrodes of the mos transistor Q1 and the mos transistor Q2 are connected in series with a resistor R2 and then connected with the mos transistor N1; by arranging the switch array module and cooperating with the front-end acquisition module and the main control module, data acquisition of each individual battery in the plurality of strings of lithium batteries can be realized, and when the battery voltage is low, the switch loop in the corresponding switch array module is disconnected, so that individual control of each loop is realized; and the phenomenon that the battery is not fully charged due to integral cutting is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium battery management, in particular to a parallel charging battery management system. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. The overall energy storage can be increased by increasing the number of lithium battery strings, but lithium batteries have their own differences and inconsistencies in self-consumption during long-term use. The differences will accumulate over long periods of time, and when multiple lithium batteries are connected in series, the overall capacity becomes smaller due to the barrel effect, resulting in poor charging effects. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a battery management system for parallel charging.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A battery management system for parallel charging, comprising a front-end acquisition module, a main control module and a switch array module, wherein the switch array module is connected between a battery pack and a charging port, the front-end acquisition module is connected to the battery pack, the main control module is connected to the switch array module and the front-end acquisition module, the switch array module comprises a plurality of switch loops, wherein one switch loop comprises a MOS tube Q1, a MOS tube Q2 and a MOS tube N1, the MOS tube Q1 and the MOS tube Q2 are connected in series between the B3 and C3 terminals, the gates of the MOS tube Q1 and the MOS tube Q2 are connected in series with a resistor R2 and then connected to the MOS tube N1, and the MOS tube N1 is connected to a control signal BK3 sent by the main control module.

[0006] In the utility model, preferably, after the gates of the MOS tube Q1 and the MOS tube Q2 are connected together, the series resistor R2 is connected to the drain of the MOS tube N1, the source of the MOS tube N1 is grounded, the gate of the MOS tube N1 is connected to the series resistor R3 and then connected to the control signal BK3, and the series resistor R4 is connected to the ground.

[0007] In the present invention, preferably, a resistor R1 is connected in parallel between the source and the gate of the MOS transistor Q1 and the MOS transistor Q2.

[0008] In the present invention, preferably, several of the switch circuit connection structures are the same.

[0009] In the present invention, preferably, the front-end acquisition module includes a collector U10, and the external RC network connected to the pins 11 to 17 of the collector U10 is connected to the points B0 to B6 corresponding to the battery.

[0010] In the present utility model, preferably, the 33-pin of the collector U10 is connected to the MOS tube Q10 and then to the voltage regulator U9, the input end of the voltage regulator U9 is connected to the positive terminal of the battery through the MOS tube Q10 and in series with the resistor R25, and the output voltage of the voltage regulator U9 is input to the main control module.

[0011] In the present utility model, preferably, the main control module includes a main controller U1, and pin 1 and pins 44-48 of the main controller U1 output control signals to the switch circuit.

[0012] In the present invention, preferably, pins 18 and 19 of the main controller U1 are connected to pins 26 and 27 of the collector U10 to perform data interaction with the collector U10, and the collector U10 processes the voltage information.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The system of the utility model can realize data collection of each individual battery in multiple strings of lithium batteries by setting a switch array module, cooperating with a front-end acquisition module and a main control module. When the battery voltage is low, the switch circuit in the corresponding switch array module is disconnected, thereby realizing individual control of each circuit, avoiding the phenomenon of insufficient battery charging caused by overall disconnection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural block diagram of a parallel charging battery management system described in the utility model.

[0016] Figure 2 This is a circuit diagram of the switch array module described in the utility model.

[0017] Figure 3 This is a circuit diagram of the main control module described in the utility model.

[0018] Figure 4 This is a circuit diagram of the front-end acquisition module described in the utility model. DETAILED DESCRIPTION

[0019] 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.

[0020] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0022] Please also see Figures 1 to 4 A preferred embodiment of the utility model provides a battery management system for parallel charging, including a front-end acquisition module, a main control module and a switch array module, wherein the switch array module is connected between the battery pack and the charging port, the front-end acquisition module is connected to the battery pack, and the main control module is connected to the switch array module and the front-end acquisition module, wherein the front-end acquisition module is used to collect the voltage, current and temperature data of the connected batteries and transmit them to the main control module, and the main control module adjusts the on and off of each circuit in the switch array module according to the state of the battery, thereby realizing the gating or closing of one or more batteries.

[0023] Specifically, the switch array module includes several switch loops, and the connection structures of the several switch loops are the same. One of the switch loops is used as an example for description. One of the switch loops includes a MOSFET Q1, a MOSFET Q2, and a MOSFET N1. The MOSFET Q1 and the MOSFET Q2 are connected in series between the B3 and C3 terminals. The B3 terminal and the C3 terminal are connected to a battery and a charging port respectively. The gates of the MOSFET Q1 and the MOSFET Q2 are connected in series with a resistor R2 and then connected to the MOSFET N1. The MOSFET N1 is connected to the control signal BK3 sent by the main control module. After the gates of the MOSFET Q1 and the MOSFET Q2 are connected together, the resistor R2 is connected in series with the drain of the MOSFET N1, and the source of the MOSFET N1 is grounded. The gate of the MOSFET N1 is connected in series with a resistor R3 and then connected to the control signal BK3, and the resistor R4 is connected in series with the ground terminal. A resistor R1 is connected in parallel between the source and the gate of the MOSFET Q1 and the MOSFET Q2. The control signal BK3 is sent by the control module. In the default state, the control signal BK3 is low, the MOSFET N1 is turned off, the gates of the MOSFET Q1 and the MOSFET Q2 are pulled to a high level by the resistor R1 and lose the driving voltage and are turned off, and the loop between the B3 terminal and the C3 terminal is cut off. When the control signal BK3 is high, the MOSFET N1 is turned on, the resistor R1 and the resistor R2 divide the voltage so that the MOSFET Q1 and the MOSFET Q2 obtain the driving voltage and are turned on, and the loop from the B3 terminal to the C3 terminal is turned on.

[0024] Specifically, the front-end acquisition module includes a collector U10, and the external RC network connected to the 11-17 pins of the collector U10 is connected to the corresponding points B0-B6 of the battery. The external RC network includes several groups of RC loops, such as the 11 pin of the collector U10 is connected in series with the resistor R73, and the capacitor C38 is connected in series with the capacitor part of another RC loop, and finally connected to the ground end. The collector U10 collects the voltage of each battery through the external RC network. The 33 pin of the collector U10 is connected to the MOS tube Q10 and then connected to the regulator U9. The input end of the regulator U9 is connected to the positive terminal of the battery through the MOS tube Q10 and the resistor R25 in series. The regulator U9 stabilizes the input voltage and then the output voltage is input to the main controller U1 of the main control module for power supply.

[0025] The main control module includes a main controller U1, and pins 1 and 44-48 of the main controller U1 output control signals to the switch circuit, that is, output signals BK1-BK6 to the corresponding switch circuit. Pins 18 and 19 of the main controller U1 are connected to pins 26 and 27 of the collector U10 to exchange data with the collector U10, and the collector U10 transmits the processed voltage information to the main controller U1.

[0026] Working principle:

[0027] The collector U10 collects the voltage at both ends of each battery and transmits it to the main controller U1 after processing. The main controller U1 outputs control signals BK1-BK6 through judgment. The control signals BK1-BK6 are transmitted to the corresponding switch circuits. According to the control signals BK1-BK6, corresponding actions are taken to realize the conduction or disconnection of the corresponding circuits. Through this system, the on-off control of each single battery in multiple strings of batteries is quickly realized. The circuit structure is simple, easy to implement, and the effect is good.

[0028] The above description is a detailed description of the preferred feasible embodiment of the utility model, but the embodiment is not used to limit the scope of the patent application of the utility model. All equivalent changes or modified changes completed under the technical spirit suggested by the utility model should fall within the patent scope covered by the utility model.

Claims

1. A battery management system for parallel charging, characterized in that: It includes a front-end acquisition module, a main control module and a switch array module. The switch array module is connected between the battery pack and the charging port. The front-end acquisition module is connected to the battery pack. The main control module is connected to the switch array module and the front-end acquisition module. The switch array module includes several switch loops, one of which includes a MOS tube Q1, a MOS tube Q2 and a MOS tube N1. The MOS tube Q1 and the MOS tube Q2 are connected in series between the B3 and C3 terminals. The gates of the MOS tube Q1 and the MOS tube Q2 are connected in series with the resistor R2 and then connected to the MOS tube N1. The MOS tube N1 is connected to the control signal BK3 sent by the main control module.

2. A parallel charging battery management system according to claim 1, characterized in that: After the gates of the MOS transistors Q1 and Q2 are connected together, the resistor R2 is connected in series to the drain of the MOS transistor N1, the source of the MOS transistor N1 is grounded, the gate of the MOS transistor N1 is connected in series to the resistor R3 and then connected to the control signal BK3, and the resistor R4 is connected in series to the ground.

3. A parallel charging battery management system according to claim 2, characterized in that: A resistor R1 is connected in parallel between the source and the gate of the MOSFET Q1 and the MOSFET Q2.

4. A parallel charging battery management system according to claim 1, characterized in that: Several of the switch circuit connection structures are the same.

5. A parallel charging battery management system according to claim 4, characterized in that: The front-end acquisition module includes a collector U10, and the 11th to 17th pins of the collector U10 are connected to an external RC network and then connected to points B0-B6 corresponding to the battery.

6. A parallel charging battery management system according to claim 5, characterized in that: Pin 33 of the collector U10 is connected to the MOS tube Q10 and then to the voltage regulator U9. The input end of the voltage regulator U9 is connected to the positive terminal of the battery through the MOS tube Q10 and in series with the resistor R25. The output voltage of the voltage regulator U9 is input to the main control module.

7. A parallel charging battery management system according to claim 6, characterized in that: The main control module includes a main controller U1, and pins 1 and 44-48 of the main controller U1 output control signals to the switch circuit.

8. A parallel charging battery management system according to claim 7, characterized in that: The pins 18 and 19 of the main controller U1 are connected to the pins 26 and 27 of the collector U10 to perform data exchange with the collector U10, and the collector U10 processes the voltage information.

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