CN206098603U - Power supply system based on dual-mode full-function battery management - Google Patents

Abstract

The utility model discloses a power supply system based on dual-mode full-function battery management, which comprises a battery pack, a battery management system and an electrical appliance control unit, wherein the battery management system comprises a total input power supply management module, a battery module and a battery unit, the battery unit is controlled by the battery module, the total input power supply management module provides input power supply for the battery module and the battery unit, the battery management system provides output power supply for the electrical appliance control unit, the battery management system provides large current charging for the battery pack through the battery module, when a set charging threshold value is reached, the battery unit adopts a single small current charging mode to charge single batteries in the battery pack, the charging safety of the batteries is effectively protected, the internal short circuit of the batteries caused by over-charging and over-discharging of the lithium batteries is avoided, and the safety danger of ignition, combustion and explosion of the batteries are avoided, the situation of poor consistency is avoided in the use process of the battery.

Description

Power system based on dual-mode full-function battery management

technical field

The utility model relates to a power supply system, in particular to a power supply system based on dual-mode full-function battery management.

Background technique

Lithium-ion secondary power supplies are widely used in power and energy storage power systems. At present, the charging mode of all lithium battery power management systems is to use the entire battery pack of the system to charge, and does not control the charging of each single battery in the entire battery pack.

Due to the differences in the consistency of the individual batteries in the entire battery pack, when a single battery in the entire battery pack is fully charged, the battery management system will continue to charge the entire battery pack until all the batteries in the entire pack are fully charged. will stop charging the battery pack. In the case of a large difference in the consistency of the single battery, it will cause the battery with a good state of health (SOH, State of Health) to be fully charged, while other batteries in the same group are not fully charged, and the entire battery is still charging. It is easy to cause battery overcharge, generate lithium dendrites, cause internal short circuit of the battery, battery fire and explosion safety accidents.

Contents of the invention

Aiming at the defects of the battery management system in the prior art, the utility model provides a power supply system based on dual-mode full-function battery management, which effectively solves the problem of overcharging and over-discharging of the single cells of the battery pack during the use of the power supply, and avoids the battery during use. , resulting in poor consistency.

The utility model adopts the following technical solutions:

The power supply system based on dual-mode full-function battery management includes a battery pack, a battery management system, and an electrical appliance control unit. The battery pack includes several battery packs. The battery management system includes a total input power management module for controlling the battery pack. The battery module for overall charging, the battery unit for independently charging the single cells in the battery pack, and the discharge detection module for detecting the discharge of the battery module and the battery unit, the battery unit is controlled by the battery module, so The total input power management module provides input power for the battery module and the battery unit, and the battery management system provides output power for the consumer control unit.

When any single battery in the battery pack reaches the set charging threshold, the battery module stops the unified charging mode of the entire battery pack and switches to the battery unit charging mode, and the battery units charge the single batteries of each battery pack independently ; When any single cell in the battery pack reaches the set discharge threshold, the discharge detection module stops the battery pack from discharging.

Preferably, the battery module includes a battery module charging management module, a battery unit charging management module, a battery module input power module, a battery module output power module, a battery module CAN communication module, a battery unit CAN communication module, a battery A module charging information module and a battery unit charging information module, the battery module charging management module respectively obtains the battery information of the battery pack and the single battery through the battery module charging information module and the battery unit charging information module, and the battery module The charging management module is connected to the battery unit through the battery unit charging management module. The battery module input power module is connected to the total input power management module. The charging management module sends the communication data of the battery module and the battery unit through the battery module CAN communication module and the battery unit CAN communication module.

Preferably, the battery information includes charging voltage, current, capacity, battery charging status, battery health status, temperature and abnormality information.

Preferably, the battery unit includes a battery unit input power module and a battery unit output power module, the battery unit input power module and the battery unit output power module are controlled by the battery unit charge management module, and the battery unit charge management module The module charges the single battery through the battery unit output power module.

Preferably, the discharge detection module includes a battery module discharge information module, a battery unit discharge information module, a discharge warning module and a battery pack temperature control module, and the battery module discharge information module and the battery unit discharge information module are used to obtain Including single battery discharge voltage, current, capacity, temperature and abnormal information.

Preferably, the charging modes of the battery cells include series pulse charging mode, series constant current charging mode and parallel single point constant voltage independent charging mode.

Preferably, the battery module charging management module and the battery unit charging management module respectively include a voltage charging module and a current charging module, and the battery module output power module and the battery unit output power module include a voltage output module and a current output module respectively .

Preferably, the discharge detection module, the battery module and the battery unit share an information collection point.

Preferably, the power supply mode provided by the total input power management module includes DC power supply and AC power supply, and the total input power management module includes undervoltage, high voltage and short circuit protection modules.

During the charging process of the battery pack, the battery module is charged in a unified mode to charge the entire battery pack. When any single battery in the battery pack reaches the set charging threshold, the battery management system immediately stops the battery module and the entire battery pack. Charging mode to ensure that the single battery will not cause overcharge of the single battery during the charging process of the battery module; then switch to the battery unit control to charge each single battery in each battery pack independently.

When the single battery is fully charged, stop charging the fully charged single battery, and continue to charge other battery cells that are not fully charged until all battery units are fully charged, ensuring independent charging control of all single batteries without interfering with each other impact, to avoid overcharging of the single battery.

During discharge, the discharge detection module monitors the discharge information of the battery module and single battery unit. When the discharge of any single battery in the battery module is lower than the set threshold, the entire battery module stops discharging to avoid battery module discharge. The single battery in the battery is over-discharged, resulting in poor consistency of the battery pack, improving battery safety and efficiency.

The beneficial effects of the utility model are: the battery management system provides the battery pack with a high-current charge for the entire battery pack through the battery module, and when the set charging threshold is reached, the battery unit adopts a separate low-current charging mode for the battery pack in the battery pack. Single battery charging can effectively protect the safety of battery charging, avoid overcharging of lithium batteries, prevent overcharging of lithium batteries during charging, and the formation of lithium dendrites, resulting in short circuits inside the battery, and the safety hazard of battery fire, combustion and explosion.

Description of drawings

Fig. 1 is a block diagram of the utility model;

Fig. 2 is a functional block diagram of a power supply system with n battery modules in the utility model;

Fig. 3 is a schematic structural view of the information collection point shared by the discharge detection module, the battery module and the battery unit in the present invention;

Fig. 4 is a schematic diagram of a three-dimensional structure of a single battery module in the present invention.

Among them, the battery unit 1, the battery module 2, the discharge detection module 3, and the information collection point 4.

detailed description

The utility model will be further described below in conjunction with specific embodiments, but it is not limited thereto.

Referring to Figure 1-2, the power system based on dual-mode full-function battery management includes a battery pack, a battery management system, and an electrical appliance control unit. The battery pack includes several battery packs, and the battery management system includes a total input power management module, a battery Module 2 and battery unit 1. Battery module 2 is used to charge the battery pack as a whole. The charging process is BG mode (BG _n , Battery Group); battery unit 1 is used to independently charge the single cells in the battery pack. This charging process is BU mode (BU _nm , Battery Unit), where n and m are integers ≥1. The battery unit 1 is controlled by the battery module 2. When any single battery in the battery pack reaches the set charging threshold, the battery module 2 stops the unified charging mode of the whole group of batteries and switches to the charging mode of the battery unit 1. At this time, the battery unit 1 The individual batteries in each battery pack are charged independently. The total input power management module provides input power for the battery module 2 and the battery unit 1, and the battery management system provides output power for the electrical control unit.

Among them, the battery module 2 includes a battery module charging management module, a battery unit charging management module, a battery module input power module, a battery module output power module, a battery module CAN communication module, a battery unit CAN communication module, and a battery module charging information module and battery unit charging information module, the battery module charging management module respectively obtains the battery information of the battery pack and the single battery through the battery module charging information module and the battery unit charging information module, and the battery module charging management module The module is connected to the battery unit 1 through the battery unit charging management module, the battery module input power module is connected to the total input power management module, the battery module outputs the power module output to charge the battery module as a whole, and the battery module charges The management module sends the communication data of the battery module and the battery unit through the battery module CAN communication module and the battery unit CAN communication module. Among them, the battery information includes charging voltage, current, capacity, battery charging status, battery health status, temperature and abnormal information. When charging the battery pack as a whole, the battery module charging management module controls the battery module input power module and the battery module output power module, and the battery module is charged as a whole through the battery module output power module.

The battery unit 1 includes a battery unit input power module and a battery unit output power module, and the battery unit charging management module is respectively connected to the battery unit input power module, the battery unit output power module and the battery unit CAN communication module. When independently charging the single cells of the battery pack, the battery unit charging management module is connected to the total input power management module to obtain power through the battery unit input power module, and independently charges each single battery through the battery unit output power module.

Among them, the battery module charging management module and the battery unit charging management module respectively include a voltage charging module and a current charging module, while the battery module output power module and the battery unit output power module include a voltage output module and a current output module respectively. When using the voltage output module to output voltage, it is charged. When using current charging, it is charged through the current output module to output current. That is, the battery module charging management module and the battery unit charging management module have two modes: voltage charging and current charging. . Further, the battery unit output power supply module includes a series pulse charging mode, a series constant current charging mode and a parallel single point constant voltage independent charging mode. When the battery unit 1 is used to charge a single battery, the series pulse charging mode, series constant The current charging mode and the parallel single-point constant voltage independent charging mode are used for charging.

In an embodiment, the power supply mode provided by the total input power management module includes DC power supply and AC power supply, that is, DC or AC power can be used for charging. The total input power management module includes undervoltage, high voltage and short circuit protection modules, which is beneficial to protect the battery management system and effectively protect the safety of battery charging.

As shown in Figure 2, in this embodiment, the battery management system has a battery module 2, which is connected to control n battery units (BU _n ), and the battery module 2 is provided with power input by the total input power management module .

Firstly, the mains alternating current AC240V is converted into multiple groups of isolated output direct current DC60V/20A through the power management and control module. Then use the BG mode to charge the entire battery pack in series with constant current and high current. When the charging voltage of a single battery in the battery pack reaches 4.15V, the battery management system cuts off the charging in the BG mode, and uses the BU mode to charge the single battery. Charging, start the parallel single-point constant voltage independent charging mode to charge the single battery; when the voltage of the single battery is ≥ 4.18V, stop charging the single battery to avoid overcharging of the single battery during the charging process of the whole battery pack Dangerous, avoid the danger of battery fire, combustion and explosion, and effectively ensure the safety of batteries and electrical appliances.

3 and 4, in this embodiment, when discharging, the discharge detection module 3 monitors the discharge state information of the battery module 2 and the battery unit 1, and when the single battery reaches the set discharge threshold, the discharge detection module 3 stops the battery. Group discharge mode. Discharge detection module 3 adopts CAN2.0 protocol for module-to-module communication, module-to-power system network communication, module-to-battery unit 1 communication, discharge detection module 3, battery module 2 and battery unit 1 share Information collection point 4, but the communication network adopts physical layer isolation.

When discharging, the information of each battery string in the battery module 2 is collected and calculated, and broadcast through the CAN network. The discharge voltage and current protection adopts three levels, the first level of early warning, the second level of alarm, and the third level of forced cut-off. An external display can be connected to monitor the voltage, temperature, current, SOC, insulation performance, etc. of each string of batteries in real time.

The above is only a typical embodiment of the utility model, and the utility model is not limited to the above-mentioned embodiment, as long as it achieves the practical effect of the utility model with the same technical means, it should belong to the protection scope of the utility model .

Claims (10)

1. the power-supply system based on bimodulus global function battery management, it is characterised in that：Including battery bag, battery management system and use Electrical control unit, if the battery bag includes dry cell batteries, the battery management system include total input power management module, For set of cells is integrally charged battery modules, for the battery unit and use of the cell charge independence to set of cells In the electric discharge detecting module to battery modules and cell discharge detection, the battery unit is by battery modules control, described Total input power management module is that battery modules and battery unit provide input power, and the battery management system is electrical appliance control Unit processed provides out-put supply and powers.

2. the power-supply system based on bimodulus global function battery management according to claim 1, it is characterised in that：Work as set of cells When arbitrary cell reaches setting charge threshold, the battery modules stop whole group battery and unify charge mode, switch to electricity Pool unit charge mode, the battery unit is respectively to cell charge independence in each set of cells；When the arbitrary monomer of set of cells When battery reaches setting discharge threshold, electric discharge detecting module stops battery power discharge.

3. the power-supply system based on bimodulus global function battery management according to claim 2, it is characterised in that：The battery Module includes battery modules charge management module, battery unit charge management module, battery modules input power module, battery mould Group out-put supply module, battery modules CAN communication module, battery unit CAN communication module, battery modules charge information module and Cell charging information module, the battery modules charge management module pass through battery modules charge information module and battery list First charge information module obtains the battery information of set of cells and cell respectively, and the battery modules charge management module passes through Battery unit charge management module connects battery unit, the battery modules input power module and total input power management module Connection, the battery modules out-put supply module output are integrally charged to battery modules, the battery modules charge management module The communication data of battery modules and battery unit is sent by battery modules CAN communication module and battery unit CAN communication module.

4. the power-supply system based on bimodulus global function battery management according to claim 3, it is characterised in that：The battery Information includes charging voltage, electric current, capacity, battery charging state, cell health state, temperature and abnormal information.

5. the power-supply system based on bimodulus global function battery management according to claim 3, it is characterised in that：The battery Unit includes battery unit input power module and battery unit out-put supply module, the battery unit input power module and Battery unit out-put supply module is controlled by the battery unit charge management module, and the battery unit charge management module is led to Cross battery unit out-put supply module to be charged cell.

6. the power-supply system based on bimodulus global function battery management according to claim 5, it is characterised in that：The electric discharge Detecting module includes battery modules discharge information module, cell discharge information module, electric discharge warning module and set of cells temperature Degree control module, the battery modules discharge information module and cell discharge information module are used to obtain includes cell Discharge voltage, electric current, capacity, temperature and abnormal information.

7. the power-supply system based on bimodulus global function battery management according to claim 5, it is characterised in that：The battery The charge mode of unit includes series pulse charge mode, series connection constant current charging mode and single-point constant pressure charge independence mould in parallel Formula.

8. the power-supply system based on bimodulus global function battery management according to claim 5, it is characterised in that：The battery Module charge management module and battery unit charge management module include voltage charging module and electric current charging module respectively, described Battery modules out-put supply module and battery unit out-put supply module include voltage output module and current output module respectively.

9. according to the arbitrary described power-supply system based on bimodulus global function battery management of claim 1-8, it is characterised in that：Institute State electric discharge detecting module, battery modules and battery unit shared information collection point.

10. the power-supply system based on bimodulus global function battery management according to claim 9, it is characterised in that：It is described Total input power management module provides power mode includes DC source and alternating current power supply, total input power management module bag Include under-voltage, high pressure and short circuit protection module.