Why need C&D BHM System

  • Online monitoring and capacity management of valve regulated lead acid (VRLA) battery remains to be a tricky issue for power supply system management.
  • To predict failure according to discharge condition or cell voltage readings has been proven to be an energy-consuming and costly job, and may even spell hazard to reliability of the whole system.
  • With more than 100 years’ experience in manufacturing of batteries, C&D Group is well familiar with every battery feature in entire life cycle
  • C&D battery health management system applies to all lead acid battery products
  • The management functions tailored for C&D batteries can make reasonable and accurate diagnosis of state of health (SOH) of batteries
  • Solution packages are available to allow for complete installation in one go
  • One-stop after-sales service makes battery monitoring an easy job
  • More economical initial investment, more assured use experience and optimal total cost of ownership

Battery Characteristics

Battery Constructions

Battery State of Health(SOH)

  • A battery’s state of health (SOH) indicates its capacity, degree of health, performance and life information. Specifically, it represents the battery’s maximum discharge capacity vs. its rated capacity. It’s no less than 100% for a fresh battery and 0% for a spent battery.
  • VRLA battery is a complicated electrochemical system. Its ageing failure involves a complicated mechanism. Many factors would impact the aging mode. It’s difficult to rely on float data alone to achieve accurate evaluation of a battery’s SOH. It needs combination of various theoretical models and tremendous experimental data, together with some discharge readings, to anticipate the degree of deterioration of batteries.

C&D Accurate SOH Calculation

Multi-parameters calculation method:

  • Theoretical calculation, based on huge C&D Lab and site application data for adjustment
  • Internal resistance tracking and testing analysis
  • Arrhenius temperature rule
  • Floating AH accumulation
  • Discharge AH accumulation
  • EPV comparison and analysis
  • SOC calculation

Internal Resistance Tracking and Testing Analysis

Internal Resistance

Arrhenius Temperature Rule

Arrhenius equation is the relationship between the rate constant of chemical reaction and
temperature, applied for element reactions, Non element reactions and some inhomogeneous
reactions.

Arrhenius-Temperature-Rule

Based on theory and practical battery real temperature (Discharge，Charge，Float mode)

Temperature Profile

Float AH Accumulation

Float-AH-Accumulation

Discharge AH Accumulation

  • Cyclic life- 80 % DOD
    –Cyclic: 1200 cycles
    –Float: 200 cycles
  • Total Discharge AH
    –Cyclic: 96 kAh per 100 Ah capacity
    –Float:16 kAh per 100 Ah capacity
  • Applying temperature compensation

Discharge Remaining Time Forecast

Discharge-Remaining-Time-Forecast

BHM for Data Center UPS

  • Data center UPS power supply system is key equipment of the supply system.

  • During the UPS operation, some batteries lost their element compression, thermal runaway or dry-out. Battery performance degradation brings huge risks to the UPS power system stability.

  • Ensure that all the single battery charge voltage, current and temperature operating parameters is reasonable.

  • Select the deterioration batteries by testing the battery impedance.

  • Record the single cell battery and the alarm state.

BHM for Data Center HVDC

  • Some innovative data center is gradually using HVDC power supply system to replace the UPS system. The HVDC system is simple, low cost, and the reliability is guaranteed.

  • However, HVDC reliability is directly from the highly reliable battery system. If the battery management properly, that will significantly reduce the HVDC system reliability indices.

  • Therefore, in the HVDC system, the battery system monitoring, health management, reliability, security is the most critical aspects. Monitoring the safety of every single battery status, health status, is the essential function of HVDC system.

  • The battery health management system can real-time monitor the running status and the health status of the batteries.

Core Value

  • Real-time online monitoring of every single cell voltage, internal resistance of the cell, cell temperature, battery voltage I current, temperature and other parameters to ensure system reliability work, early detection of weak batteries.
  • Reduce the risk of fire, so as to effectively improve the security of IT equipment.
  • To meet international standards (TIA942-200S).
  • Reducing battery replacement costs in advance.
  • Reducing the waste of lead and damage to the environment.

BHM for Telecom

  • Improve the communication system power supply reliability, eliminate battery failure problems.

  • Reduce the waste of lead and damage to the environment.

  • In the communication system, the communication power supply system always uses batteries to provide a stable, continuous DC power.

  • Improve the communication system power supply reliability, eliminate battery failure problems.

  • Reduce the waste of lead and damage to the environment.

  • In the communication system, the communication power supply system always uses batteries to provide a stable, continuous DC power.

BHM-for-Telecom

Use battery health management system, to achieve:

  • Real-time online monitoring of every single cell voltage, internal resistance of the cell, cell temperature, battery voltage / current, temperature and other parameters to ensure system reliability work, early detection of weak batteries
  • On-line detection of single cell resistance, accurately determine the deterioration of the battery in the battery

  • Determine and record the alarm state of the single cell battery.
  • Accessing communication system power and environmental monitoring, it can remote monitor battery parameters.
  • Improve the communication system power supply reliability, eliminate battery failure problems.
  • Reduce the waste of lead and damage to the environment.
BHM-for-Telecom-1

C&D BHM System Components

BHM Unit

BHM Unit

Max-managing 4 strings or 250 blocks of batteries in 1 power system
BHM-LCD

BHM-LCD

Connected BHM Unit, for local demonstration
CDM Data Detected Module

CDM Data Detected Module

1 pc for a cell, monitoring single cell voltage, internal resistance, and temperature
CDM-C Current Detected Module

CDM-C Current Detected Module

Each string has 1 unit; collected string current data and ambient temperature
CDM detected wire

CDM detected wire

Connected battery and CDM detected module
Hall current sensor

Hall current sensor

0~3000A optional, measure current of battery string
CDM communication wire

CDM communication wire

For communication between CDM detected modules
CDM detected wire

CDM detected wire

Connected the first battery in the string and current detected module

Functions and Features of C&D BHM System

  • Real-time monitoring battery, including total voltage and string current of batteries, voltage, internal resistance and temperature of each cell, and ambient temperature etc. Fully covered all the monitoring scope.
  • Loop type data collection path management: The end-to-end design and independent work mode improves serviceability of the system.
  • Accurate internal resistance reading due to core battery design model-based automatic adapted internal resistance testing technology: Combining C&D’s more than 100 years’ experience in battery production and technology, the system achieves more accurate calculation and display of battery SOH.
  • Recording of entire battery charging and discharge process: Through real-time data analysis, it gives and records audible and visual warnings of overranging parameters.
  • Independent networking feature spells stable and reliable system firmware integration. Also, communication port allows for access to dynamic environmental monitoring system. Supporting MODBUS protocol.
  • Complied with CE certification
  • Compliant with requirements of ANSI/TIA-942 and GB50174-2008

System Topology Map

System-Topology-Map

Connection Diagram

connection-diagram

Software Interface

C&D Battery Health Management System
Battery Health Management System

User-friendly software interface features simple operation, intuitional display of data and alarms, and storage and export of historical data.

Data Detected Module Info

Parameters Model
CDM-12V/CDM-6V CDM-2V
Battery capacity range 7~300Ah 200~3000Ah
Single cell voltage scope 0~16V 0~4V
Single cell Internal resistance scope 0~100mΩ
Single cell temperature scope -30~85℃
Single cell voltage accuracy ±0.5%
Single cell Internal resistance accuracy ±2%
Single cell temperature accuracy ±1℃
Rated temperature and humidity 0~40℃，5~95%RH
Communication interface RJ45
Size 100x50x25mm

System Configuration for Example

Data center UPS battery health management system typical configuration

Site conditions Model Quantity Remarks
2 strings batteries for each UPS, each battery string including 34 blocks 12V batteries. Total 20 sets UPS. CDM-12V
Detected Module		 1360 pcs 34block*2strings*20sets battery data inspection (Inspect battery voltage, internal resistance, and temperature)CDM-2V
Hall Current Sensor 40pcs Hall current sensor
CDM-C Current detected module 40pcs Detected current data and ambient temperature
BHM Unit 10sets Battery Management System
Site Monitoring/Server 1set Industrial PC
Battery Cable 20sets Flame Retardant Cable

Data center HVDC battery health management system typical configuration

Site conditions Model Quantity Remarks
2 strings batteries for HVDC, each battery string including 20 blocks 12V batteries. CDM-2V
Detected Module		 109pcs 109block*1strings battery data inspection (Inspect battery voltage, internal resistance, and temperature)
Hall Current Sensor 1pc Hall Current Sensor
CDM-C Current detected module 1pc Detected current data and ambient temperature
BHM Unit 1set Battery Management System
Site Monitoring/Server 1set Industrial PC
Battery Cable 1set Flame Retardant Cable