BMS (Battery Management System) of high-capacity battery pack

Abstract

The utility model relates to the technical field of battery pack management, and particularly provides a high-capacity battery pack BMS management system, which comprises a battery pack, an MCU module, an interface module, an identification module, a communication module, a charging control module, a discharging control module, a low-power output module, an equalization module and a FUSE protection module, according to the utility model, the arrangement of the interface module can be used for accessing a power supply for charging and accessing a load for discharging, single-port dual-purpose, fool-type use is not easy to make mistakes, the use of interfaces is reduced, the power consumption is reduced, and the cost is saved; the identification module is arranged to identify charging and discharging states and cooperate with the interface module to realize a better single-port dual-purpose effect; by arranging the charging control module and the discharging control module, on-off state control can be carried out on charging and discharging of the circuit, and excessive charging and discharging of the battery pack are prevented; the arrangement of the low-power output module can limit the discharge rate of the battery, thereby protecting the battery pack.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack management, in particular to a BMS management system for large-capacity battery packs. Background Art

[0002] In order to meet the needs of high-power products such as robots, electric vehicles, and power tools, large-capacity power supply modules with multiple series-parallel lithium batteries have been launched on the market.

[0003] In traditional technology, different interfaces are used for charging and discharging of large-capacity power supply modules. The use of multiple interfaces leads to the problem of easy misconnection of charging and discharging, and the use of multiple interfaces consumes large power, increasing product application costs. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a large-capacity battery pack BMS management system to solve the problems of easy connection errors and high cost in the prior art of using multiple interfaces to connect charging and discharging separately.

[0005] To achieve the above and other related purposes, the present invention provides a large-capacity battery pack BMS management system, which includes:

[0006] A battery pack, wherein the battery pack is composed of multiple lithium batteries connected in parallel;

[0007] MCU module, the MCU module uses a main control chip U1 to manage the use of the battery pack;

[0008] Interface module, the interface module uses a power driver chip U2, the power driver chip U2 is provided with a terminal J1, the terminal J1 can be connected to the power supply for charging and to the load for discharging;

[0009] Identification module, which uses a transistor optocoupler U3, the control input terminal CHG_IN of the transistor optocoupler U3 is connected to the power driver chip U2, and the detection input terminal CHGD_IN is connected to the main control chip U1, for identifying the charging and discharging status;

[0010] A communication module, wherein the communication module uses a communication interface chip U4, a first photocoupler Q13 and a second photocoupler Q14, wherein the input end of the first photocoupler Q13 is connected to the main control chip U1, and the output end is connected to the communication interface chip U4, and the input end of the second photocoupler Q14 is connected to the communication interface chip U4, and the output end is connected to the main control chip U1;

[0011] A charging control module, wherein the charging control module adopts a first MOS group, the first MOS group is connected to the interface module, and is used to control the charging state of the circuit;

[0012] A discharge control module, wherein the discharge control module adopts a second MOS group, and the second MOS group is connected between the charge control module and the MCU module to control the discharge state of the circuit;

[0013] The low-power output module adopts an NMOS transistor Q29, the G pole of the NMOS transistor Q29 is connected to the main control chip U1, the D pole is connected to the power driver chip U2, and the S pole is grounded.

[0014] In one embodiment of the present invention, a balancing module is provided between the MCU module and the battery pack. The balancing module includes a plurality of balancing circuits distributed in parallel. A single balancing circuit corresponds to one lithium battery cell, and is used to balance the load consumption of the battery cell and prevent single battery cell failure.

[0015] In one embodiment of the present invention, a single balancing circuit uses a transistor and a shunt resistor, and the shunt resistor is connected to the lithium battery; the base of the transistor is connected to the main control chip U1, and the collector is connected to the shunt resistor;

[0016] In two adjacent balancing circuits, the collector of the transistor in the balancing circuit at the upper end is connected to the emitter of the transistor in the balancing circuit at the lower end.

[0017] In one embodiment of the present invention, the interface module is further provided with a second interface terminal J2, and the second interface terminal J2 is connected to a power board, which is composed of a plurality of LED tubes distributed in parallel and is used to display the power status.

[0018] In one embodiment of the present invention, the first MOS group and the second MOS group have the same structure, both consisting of a plurality of MOS transistors distributed in parallel.

[0019] In one embodiment of the present invention, the management system further includes a FUSE protection module. The FUSE protection module uses a plurality of fuses F distributed in parallel. The fuses F are connected between the interface module and the MCU module.

[0020] In one embodiment of the present invention, the power driver chip U2 is connected to a voltage regulator chip U1 - 1 .

[0021] As described above, the large-capacity battery pack BMS management system of the present invention has the following beneficial effects:

[0022] In the present invention, the interface module is set up, which can be used to connect to the power supply for charging and to connect to the load for discharging, with a single port for dual use, reducing the use of interfaces and reducing power consumption, thus saving costs; the identification module is set up, which can identify the charging and discharging states, and cooperate with the interface module to achieve a better single-port dual-use effect; the charging control module and the discharge control module are set up, which can control the on-off state of the charging and discharging of the circuit, prevent the battery pack from being overcharged and discharged, ensure the safety of the battery pack, extend the life of the battery pack, and realize the efficient operation of the energy storage system; the low-power output module is set up, when the depth of discharge (DOD) of the battery is large, that is, the battery has released a lot of energy, if it continues to discharge at high power at this time, it may shorten the life of the battery. It can limit the discharge rate of the battery to a certain extent, reduce the damage caused by large current to the battery, thereby protecting the battery pack and further extending its service life; the setting of the balancing module can respectively correspond to the balanced load consumption of each battery, avoid failure of a single lithium battery due to excessive load, thereby improving the overall balancing effect of the battery pack and improving the overall application performance of the battery; the setting of the FUSE protection module makes the circuit charging and discharging safer and more reliable; the utility model integrates the MCU module, interface module, identification module, communication module, charging control module, discharge control module, low-power output module, and FUSE protection module into one, which can meet the management function of single-port dual-use of high-power battery pack management, effectively save application costs, and has good application prospects in the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Shown is a block diagram of the large-capacity battery pack BMS management system disclosed in the present utility model.

[0024] Figure 2 Shown is the circuit principle diagram of the large-capacity battery pack BMS management system disclosed in this utility model.

[0025] Figure 3 show Figure 2 Amplification circuit diagram of the battery pack with the balancing module.

[0026] Figure 4 show Figure 2 Amplification circuit diagram of the interface module.

[0027] Figure 5 show Figure 2 Amplification circuit diagram of the identification module.

[0028] Figure 6 show Figure 2 Amplification circuit diagram of the communication module.

[0029] Figure 7 show Figure 2Amplified circuit diagram of the charging control module.

[0030] Figure 8 show Figure 2 Amplification circuit diagram of the discharge control module.

[0031] Figure 9 show Figure 2 Amplification circuit diagram of small and medium power output module.

[0032] Figure 10 show Figure 2 Amplified circuit diagram of the FUSE protection module.

[0033] Component number description

[0034] Battery pack 1; MCU module 2; interface module 3; identification module 4; communication module 5; charging control module 6; discharge control module 7; low-power output module 8; FUSE protection module 9; power board 10; balancing module 11. DETAILED DESCRIPTION

[0035] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0036] See also Figures 1 to 10 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of this utility model. Therefore, they have no substantive technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by this utility model without affecting the efficacy and purpose that can be achieved by this utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of this utility model without substantially changing the technical content.

[0037] See also Figure 1-10The utility model provides a large-capacity battery pack BMS management system, which includes a battery pack 1, an MCU module 2, an interface module 3, an identification module 4, a communication module 5, a charging control module 6, a discharging control module 7, a low-power output module 8, and a FUSE protection module 9. The battery pack 1 is composed of multiple lithium batteries connected in parallel; the MCU module 2 uses a main control chip U1 to manage the use of the battery pack 1; the interface module 3 uses a power driver chip U2, which is provided with a terminal J1, which can be connected to a power supply for charging and a load for discharging; the power driver chip U2 is also connected to a voltage regulator chip U1-1, which can stabilize the output voltage to ensure The stability and reliability of the equipment, and effectively reduce power consumption, and improve overall work efficiency; the interface module 3 is also provided with a second interface terminal J2, and the second interface terminal J2 is connected to a power board 10, and the power board 10 is composed of a plurality of LED tubes distributed in parallel, which is used to display the power status; the identification module 4 adopts a transistor optocoupler U3, the control input terminal CHG_IN of the transistor optocoupler U3 is connected to the power driver chip U2, and the detection input terminal CHGD_IN is connected to the main control chip U1, for identifying the charging and discharging status; the communication module 5 adopts a communication interface chip U4, a first photocoupler Q13 and a second photocoupler Q14, and the input terminal of the first photocoupler Q13 is connected to the main control chip U 1. The output end is connected to the communication interface chip U4, the input end of the second photocoupler Q14 is connected to the communication interface chip U4, and the output end is connected to the main control chip U1; the charging control module 6 adopts a first MOS group, which is connected to the interface module 3 and is used to control the charging state of the circuit; the discharge control module 7 adopts a second MOS group, which is connected between the charging control module 6 and the MCU module 2 and is used to control the discharge state of the circuit; the first MOS group and the second MOS group have the same structure, and are both composed of multiple MOS tubes distributed in parallel; the low-power output module 8 adopts an NMOS tube Q29, the G pole of the NMOS tube Q29 is connected to the main control chip U1, and the D pole is connected to the power driver chip U2 , S pole is grounded; the FUSE protection module 9 adopts multiple fuses F distributed in parallel, and the fuse F is connected between the interface module 3 and the MCU module 2, making the circuit charging and discharging safer and more reliable; in the utility model, the setting of the interface module 3 can be used to connect to the power supply for charging and to connect to the load for discharging, with a single port for dual use, reducing the use of interfaces and reducing power consumption, saving costs; the setting of the identification module 4 can identify the charging and discharging status, and cooperate with the interface module 3 to achieve a better single-port dual-use effect; the setting of the charging control module 6 and the discharging control module 7 can control the on-off state of the charging and discharging of the circuit, prevent the battery pack 1 from overcharging and discharging, ensure the safety of the battery pack 1, extend the life of the battery pack 1, and achieve efficient operation of the energy storage system;The low-power output module 8 is configured to limit the battery's discharge rate to a certain extent when the battery's depth of discharge (DOD) is high, meaning the battery has already released a significant amount of energy. Continuing to discharge at high power may shorten the battery's lifespan. The low-power output module 8 can, to a certain extent, limit the battery's discharge rate, reducing damage to the battery caused by high current, thereby protecting the battery pack 1 and further extending its service life.

[0038] A balancing module 11 is provided between the MCU module 2 and the battery pack 1. The balancing module 11 includes several balancing circuits distributed in parallel, and a single balancing circuit corresponds to a lithium battery, which is used to balance the load consumption of the battery and prevent failure of a single battery. A single balancing circuit uses a transistor and a shunt resistor, and the shunt resistor is connected to the lithium battery. The base of the transistor is connected to the main control chip U1, and the collector is connected to the shunt resistor. In two adjacent balancing circuits, the collector of the transistor in the balancing circuit at the upper end is connected to the emitter of the transistor in the balancing circuit at the lower end. The setting of the balancing module 11 can respectively correspond to the load consumption of a single battery, avoid failure of a single lithium battery due to excessive load, thereby improving the overall balancing effect of the battery pack 1 and improving the overall application performance of the battery.

[0039] In summary, the present invention integrates the MCU module 2, interface module 3, identification module 4, communication module 5, charging control module 6, discharge control module 7, low-power output module 8, and FUSE protection module 9 into one device, capable of meeting the dual-use management function of a single port for a high-power battery pack 1, effectively saving application costs and possessing promising market prospects. Therefore, the present invention effectively overcomes the various shortcomings of the prior art and possesses high industrial application value.

[0040] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A large-capacity battery pack BMS management system, characterized in that: The management system includes: A battery pack, wherein the battery pack is composed of multiple lithium batteries connected in parallel; MCU module, the MCU module uses a main control chip U1 to manage the use of the battery pack; Interface module, the interface module uses a power driver chip U2, the power driver chip U2 is provided with a terminal J1, the terminal J1 can be connected to the power supply for charging and to the load for discharging; Identification module, which uses a transistor optocoupler U3, the control input terminal CHG_IN of the transistor optocoupler U3 is connected to the power driver chip U2, and the detection input terminal CHGD_IN is connected to the main control chip U1, for identifying the charging and discharging status; A communication module, wherein the communication module uses a communication interface chip U4, a first photocoupler Q13 and a second photocoupler Q14, wherein the input end of the first photocoupler Q13 is connected to the main control chip U1, and the output end is connected to the communication interface chip U4, and the input end of the second photocoupler Q14 is connected to the communication interface chip U4, and the output end is connected to the main control chip U1; A charging control module, wherein the charging control module adopts a first MOS group, the first MOS group is connected to the interface module, and is used to control the charging state of the circuit; A discharge control module, wherein the discharge control module adopts a second MOS group, and the second MOS group is connected between the charge control module and the MCU module to control the discharge state of the circuit; The low-power output module adopts an NMOS transistor Q29, the G pole of the NMOS transistor Q29 is connected to the main control chip U1, the D pole is connected to the power driver chip U2, and the S pole is grounded.

2. The large-capacity battery pack BMS management system according to claim 1, characterized in that: A balancing module is provided between the MCU module and the battery pack. The balancing module includes several balancing circuits distributed in parallel. A single balancing circuit corresponds to one lithium battery, and is used to balance the load consumption of the battery and prevent single battery failure.

3. The large-capacity battery pack BMS management system according to claim 2, characterized in that: A single balancing circuit uses a transistor and a shunt resistor, and the shunt resistor is connected to the lithium battery; the base of the transistor is connected to the main control chip U1, and the collector is connected to the shunt resistor; In two adjacent balancing circuits, the collector of the transistor in the balancing circuit at the upper end is connected to the emitter of the transistor in the balancing circuit at the lower end.

4. The large-capacity battery pack BMS management system according to claim 1, characterized in that: The interface module is further provided with a second interface terminal J2, to which a power board is connected. The power board is composed of a plurality of LED tubes distributed in parallel and is used to display the power status.

5. The large-capacity battery pack BMS management system according to claim 1, characterized in that: The first MOS group and the second MOS group have the same structure, and are both composed of a plurality of MOS transistors distributed in parallel.

6. The large-capacity battery pack BMS management system according to claim 1, characterized in that: The management system further includes a FUSE protection module. The FUSE protection module uses a plurality of fuses F distributed in parallel. The fuses F are connected between the interface module and the MCU module.

7. The large-capacity battery pack BMS management system according to claim 1, characterized in that: The power driver chip U2 is connected to a voltage regulator chip U1 - 1 .

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