CN105703405A - Extensible modular lithium ion battery uninterruptible power supply - Google Patents

Abstract

The invention relates to an expandable modular lithium-ion battery uninterruptible power supply. The invention belongs to the technical field of power supply. Scalable modular lithium-ion battery uninterruptible power supply. The cabinet is composed of a host module, a battery charging switching module, and a battery module; the host module is composed of a rectifier module, an inverter module, and a control module. The control module performs system intelligent management, Switching program execution; the host module, battery charging switching module and battery module are modular standard 2U chassis; the battery module is a battery module of lithium iron phosphate battery, and the battery module using lithium iron phosphate battery has cascading function and battery switching management The module performs switching management, and the customer selects the number of scalable batteries according to the backup time requirement to achieve load time redundancy. The invention has the advantages of environmental protection, high volume-energy ratio and weight ratio, convenient movement, high availability, high adaptability, high manageability and the like that can realize redundant loading time.

Description

A scalable and modular lithium-ion battery uninterruptible power supply

technical field

The invention belongs to the technical field of power supplies, in particular to an expandable modular lithium-ion battery uninterruptible power supply.

Background technique

At present, the UPS power supply uses a valve-regulated sealed lead-acid battery as a reserve battery. With the continuous improvement of environmental protection requirements and the improvement of the intensive degree of computer rooms, the demand for UPS is further improved. The uninterruptible power supply generated by lithium-ion batteries effectively overcomes the large size, heavy weight, and inconvenience of traditional lead-acid battery uninterruptible power supplies. Short lifespan and great environmental pollution.

However, the existing lithium-ion battery uninterruptible power supply is only a simple replacement of the traditional UPS power storage battery. The non-modular uninterruptible power supply occupies a large space, is not convenient for installation and maintenance, and the initial construction and maintenance costs are high; at the same time, the battery It is not scalable, cannot realize load time redundancy, and cannot meet the requirements of different customers for load time redundancy under different demand conditions; the availability, adaptability and management are not high and the economy needs to be improved, which can no longer meet the needs of green data centers Technical issues such as fast-growing demands supported by highly integrated UPS systems.

Contents of the invention

The invention provides an expandable modular lithium-ion battery uninterruptible power supply to solve the technical problems existing in the known technology.

The purpose of the present invention is to provide an environment-friendly, high volume-to-energy ratio and weight ratio, easy to move, easy to disassemble, easy to expand, install and repair, and can realize high availability, high adaptability and high manageability of load time redundancy. Scalable modular lithium-ion battery uninterruptible power supply with features such as high reliability.

The main components of the expandable modular lithium-ion battery uninterruptible power supply of the present invention include: a cabinet, a host module, a battery charging switching module, and a battery module. The host module is composed of a rectifier module (AC/DC conversion), an inverter module, and a control module (system intelligent management, switching program execution, communication management, etc.). The host module, battery charging switching module and battery module are all modular standard 2U (88mm*482mm*540mm) chassis, and the cabinet can be installed with 6 standard 2U cabinets, which can hold a host module and a battery at most Charging switching module and 4 battery modules. The battery module using lithium iron phosphate battery has cascading function. The cascading is realized through the parallel connection of battery modules, and the switching management is performed by the battery switching management module. Customers can choose the number of scalable batteries according to the backup time requirements to achieve load time redundancy. At the same time, the battery module is equipped with a battery management system, which can intelligently manage the on-off of the battery, and protect the battery from over-charging, over-discharging, and over-temperature. The whole uninterruptible power supply system can display the working status of UPS and battery in real time through the LCD screen, and has communication function.

The innovations of the scalable modular lithium-ion battery uninterruptible power supply of the present invention mainly include: one is to use lithium iron phosphate battery instead of valve-regulated sealed lead-acid battery; A standard 2U chassis is adopted; the third is that the battery is expandable, and customers can choose to expand the number of batteries according to actual needs to achieve redundant loading time.

The technical scheme adopted by the expandable modular lithium-ion battery uninterruptible power supply of the present invention is:

An expandable modular lithium-ion battery uninterruptible power supply is characterized in that: the expandable modular lithium-ion battery uninterruptible power supply cabinet is composed of a host module, a battery charging switching module, and a battery module; the host module is composed of a rectifier module , inverter module, and control module are connected, and the control module performs system intelligent management and switching program execution; the host module, battery charging switching module and battery module are modular standard 2U chassis, and the cabinet is a cabinet that can install several standard 2U cabinets; The battery module is a battery module of lithium iron phosphate battery. The battery module using lithium iron phosphate battery has a cascading function. The cascading is realized through the parallel connection of battery modules. There is a battery switching management module for switching management. Customers can choose to expand according to the backup time requirements. The number of batteries realizes load time redundancy.

The expandable modular lithium-ion battery uninterruptible power supply of the present invention can also adopt the following technical solutions:

The expandable modular lithium-ion battery uninterruptible power supply is characterized in that the battery module is provided with a battery management mechanism, which intelligently manages the on-off of the battery, and protects the battery from over-charging, over-discharging, and over-temperature states.

The scalable modular lithium-ion battery uninterruptible power supply is characterized in that: the control module performs communication management, and the scalable modular lithium-ion battery uninterruptible power supply is provided with a liquid crystal screen, and the UPS and battery work are displayed in real time through the liquid crystal screen state, with communication functions.

The expandable modular lithium-ion battery uninterruptible power supply is characterized in that six standard 2U cabinets are installed in the cabinet, and one host module, one battery charging switching module and four battery modules are placed.

The feature of the expandable modular lithium-ion battery uninterruptible power supply is that the bottom of the cabinet is provided with pulleys for easy movement.

The advantages and positive effects that the present invention has are:

The expandable modular lithium-ion battery uninterruptible power supply adopts the brand-new technical solution of the present invention. Compared with the prior art, the present invention has the following characteristics:

1. The present invention uses lithium iron phosphate batteries to replace traditional valve-regulated sealed lead-acid batteries, which are green, environmentally friendly, pollution-free, have good social benefits, and are green new energy sources.

2. The present invention adopts lithium iron phosphate battery, which is maintenance-free and has a long service life. The fully intelligent battery management system replaces the manual detection link. The automatic detection and protection performance of the battery management system reduces the failure rate of the battery pack to Limit, effectively solve the short life of lead-acid batteries, manual inspection and maintenance are required during use, and the use cost is very high, which reduces the use cost and life-cycle cost, and has good economic benefits and applicability.

3. The present invention applies lithium-ion batteries to a modular uninterruptible power supply system. This UPS is assembled in a standard case. The UPS has beautiful appearance, small size, light weight, easy installation, disassembly and maintenance, and high maintainability. Compared with the traditional discrete (tower) UPS system, it has the characteristics of high availability, high adaptability, and high manageability. There are obvious advantages in all aspects of platooning. At the same time, the pulley cabinet is easy to move.

4. Since the battery of the present invention can be expanded, customers can choose to expand the number of batteries according to actual needs, so as to realize redundant loading time. With the same power configuration, the UPS has higher redundancy and a more economical configuration scheme.

5. The present invention displays the working status of UPS and battery in real time through the LCD screen, including voltage, current, working mode, battery status, charging and discharging status, UPS working status, etc., has communication function, and has a high degree of intelligence.

6. The present invention is online, can realize 0ms switching, and is safe, stable and highly reliable.

Description of drawings

Fig. 1 is a functional block diagram of the scalable modular lithium-ion battery uninterruptible power supply system of the present invention;

Fig. 2 is a schematic diagram of the expandable modular lithium-ion battery uninterruptible power supply system of the present invention;

Fig. 3 is a schematic diagram of the front door opening structure of the expandable modular lithium-ion battery uninterruptible power supply of the present invention;

Fig. 4 is a schematic diagram of the rear door opening structure of the expandable modular lithium-ion battery uninterruptible power supply of the present invention;

In the figure, 1-UPS host module (2U); 2-battery charging switching module (2U); 3-battery module (2U); 4-cabinet; 5-communication connection line; 6-battery BUS line; 7-battery module Connecting cable with the battery charging switching module; 8-cooling fan.

detailed description

In order to further understand the invention content, characteristics and effects of the present invention, the following examples are given, and detailed descriptions are as follows in conjunction with the accompanying drawings:

Refer to accompanying drawing 1, Fig. 2, Fig. 3 and Fig. 4.

Example 1

An expandable modular lithium-ion battery uninterruptible power supply, the main components of which include four parts: a cabinet, a host module, a battery charging switching module, and a battery module. The host module is composed of a rectifier module (AC/DC conversion), an inverter module, and a control module (system intelligent management, switching program execution, communication management, etc.).

The specific production process of this embodiment is described in detail as follows:

1. Cabinet production

According to the installation requirements of each interface of the host module, battery charging switching module and battery module, 6 standard 2U cabinets can be installed, and a maximum of 1 host module, 1 battery charging switching module and 4 battery modules can be placed.

2. Host module production

(1) Manufacture of rectification module: The rectification circuit constitutes a DC power supply device in application, and is an interface circuit between the public power grid and power electronic devices. During production, it is important to consider allowing ultra-wide voltage input to adapt to the grid environment. Through circuit optimization design, high-power IGBT components are used to reduce the harmonic component of the input current and improve the power factor, thereby reducing heat generation.

(2) Manufacture of inverter module: The inverter is mainly composed of transistors, transformers and control circuits. Its function is to convert DC to AC output. It is the core part of UPS. The technical performance and quality of UPS mainly depend on it. During production, a high-power IGBT module full-bridge inverter circuit is used to meet the demand for high-power output, reduce output impedance, and improve fast sensing characteristics. Adopting high-frequency modulation current limiting technology and fast short-circuit protection technology, the inverter can work safely and reliably regardless of power supply voltage transients, load impacts or short circuits.

(3) Production of control module:

The UPS module is controlled by a digital MCU main chip, which can realize the networking, intelligence and miniaturization of UPS technology. The system is mainly composed of power stage circuit and control board circuit. The power stage circuit mainly includes the boot circuit, auxiliary power supply circuit, chopper circuit, power factor correction circuit and output circuit, etc.; the control board circuit mainly includes the monitoring signal circuit input to the CPU and the CPU output control and protection circuit.

The sine wave pulse width fixed-point look-up table technology is used in the control system, which can generate the APWM signal of the inverter, detect the inverter voltage, mains voltage frequency, internal temperature, battery charge and discharge management, and process the mains frequency counter inverter. Frequency-variable phase-locking, control the audible and visual alarm in the mains-to-battery and battery-to-mains modes, handle output load conditions (including short circuits) and host computer communication, etc. Equipped with a standard RS23 interface, which can be connected to monitoring software, equipped with a smart slot, which can realize the network UPS function.

2. Production of battery charging switching module

The battery charging switching module is composed of three battery charging circuits and a battery switching working circuit. The charging circuit is based on the electrochemical characteristics of the battery, and according to the electrochemical characteristics of the lithium-ion battery, it is charged by a constant current and constant voltage charging method. The control circuit can realize the constant current and constant voltage control of the output. This circuit uses the current PWM controller UC3845 as the core component, so that the system has fast transient response and high stability, overload and short circuit protection functions. The control loop realizes the overcurrent and short circuit protection functions of the circuit through the current detection of the inner loop, and the outer loop realizes the constant current control and constant voltage control of the system to ensure that the battery terminal voltage is in a constant state. The battery switching module completes the pull-in and release of the relays of the four sets of battery module switches through the instructions of the host control module to achieve conduction and cut-off of the battery circuit.

Make a standard 2U chassis that meets the installation requirements of each interface of the battery charging switching module, and install the module into the chassis.

3. Manufacturing of battery modules

The battery module is mainly composed of a lithium iron phosphate battery pack and a battery management system (BMS). The lithium iron phosphate battery pack is composed of IFR26650 single cells through 2 parts, 6 parallel connections and then 16 sets of series modules. The battery pack is equipped with a battery management system (BMS), which has balancing and protection functions to ensure the safety and stability of the energy storage battery. The circuit can detect the working status of each battery in the battery pack, obtain the voltage and working current of a single battery, and has over-charge and over-discharge protection functions and over-temperature protection functions. In addition, the BMS system has an active equalization function to ensure the consistency between the cells in the battery pack, thereby effectively ensuring the service life of the lithium iron phosphate battery pack. The cascading of battery modules is mainly through the battery communication management module built into the battery module BMS, setting different addresses for the parallel battery modules, and completing the collection and transmission of module status related information through the communication module. During the charge and discharge process, the BMS controls the discharge process of the battery, cuts off the charging or output of the module in time, and gives an alarm signal at the same time. The detailed production is as follows:

(1) Selection of single battery: Cylindrical IFR26650 lithium iron phosphate battery is selected. The single battery is composed of positive electrode, negative electrode, diaphragm, steel shell and cover plate. The battery shell size: φ26mm×65mm, and the shell is made of steel shell . The single cells are grouped according to the capacity, capacity deviation, internal resistance deviation and voltage deviation according to certain screening and grouping standards.

(2) Production of battery pack: The battery pack uses 192 single cells, and adopts a design scheme of 2 sets of 16 series and 6 parallel cascades. In each group of series-connected units, a test line is drawn from the negative pole position in the middle of each single battery, and the total negative test line is drawn from the negative pole position in the middle of the 16th single battery, and connected to the power supply BMS through 17 sampling test lines The signal detection terminal of the management module monitors the actual working conditions of each single battery in the battery pack to prevent overcharging and overdischarging. At the same time, the test line can also be used as a balanced charging circuit for the battery pack, and cooperate with the BMS system equalization circuit to perform balanced charging on the battery pack and maintain the consistency of the performance of the single cells in the battery pack. After the battery pack is bonded and combined, the battery pack is connected in series and parallel through the busbar of the whole board, and the sampling line harness and the total positive and negative wires are led out respectively, and then they are packaged into a whole with epoxy glass steel plate and then put into the chassis.

(3) Production of BMS management system: The BMS management system adopts Ti's BQ78PL116+BQ76PL102 software programming scheme with accurate power and lossless balance. The management system is divided into two parts: the integrated BMS acquisition balance board, and the integrated BMS power switch switching board. Monitor the voltage, current and temperature of each single cell in the battery pack during charging and discharging. And the monitoring data can be stored in the computer through the detection software (reserved interface). The main functions of BMS are: single cell overcharge protection, single cell undervoltage protection, single cell equalization, single cell temperature sampling and protection, battery charge and discharge current sampling and protection, battery pack total voltage collection and protection, battery pack SOC protection, sleep, intermittent charging, failure self-test function. During the debugging process of the UPS machine, it is necessary to ensure that the protection parameters set by the BMS system and the battery module switching value, alarm value and shutdown value set by the UPS system are set reasonably.

A standard 2U chassis meeting the installation requirements of each interface of the battery module is made, and the module is loaded into the chassis to obtain the scalable modular lithium-ion battery uninterruptible power supply of the present invention.

This embodiment has positive effects such as environmental protection, high volume-to-energy ratio and weight ratio, easy movement, easy disassembly, easy expansion, installation and maintenance. This embodiment can realize the high availability, high adaptability, and high manageability of the load time redundancy, and can meet the rapidly growing demand of the green data center that needs the support of the highly integrated UPS system. The scalable modular lithium-ion battery is not intermittent power supply.

Claims (5)

1. An expandable modular lithium-ion battery uninterruptible power supply is characterized in that: the expandable modular lithium-ion battery uninterruptible power supply cabinet has a host module, a battery charging switching module, and a battery module to connect to form; the host module is composed of The rectifier module, inverter module and control module are connected, and the control module performs system intelligent management and switching program execution; the host module, battery charging switching module and battery module are modular standard 2U chassis, and the cabinet can be installed with several standard 2U Cabinet; the battery module is a battery module of lithium iron phosphate battery. The battery module using lithium iron phosphate battery has a cascading function. The cascading is realized through the parallel connection of battery modules. There is a battery switching management module for switching management. Customers can choose according to the backup time requirements Scalable battery count for load time redundancy. 2. The expandable modular lithium-ion battery uninterruptible power supply according to claim 1 is characterized in that: the battery module has a battery management mechanism, intelligently manages the on-off of the battery, and overcharges, over-discharges, and overheats the battery status is protected. 3. The expandable modular lithium-ion battery uninterruptible power supply according to claim 1 is characterized in that: the control module carries out communication management, and the expandable modular lithium-ion battery uninterruptible power supply is provided with a liquid crystal screen, and through the liquid crystal screen Real-time display of UPS and battery working status, with communication function. 4. The expandable modular lithium-ion battery uninterruptible power supply according to claim 1 is characterized in that: 6 standard 2U cabinets are installed in the cabinet, and a host module, a battery charging switching module and 4 batteries are placed module. 5. The expandable modular lithium-ion battery uninterruptible power supply according to claim 4, characterized in that: the bottom of the cabinet is provided with pulleys for easy movement.