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2 vgel technique specification
1.
2V GEL Battery Product
Description
2.
2VGEL Product Description ZTE
Confidential Proprietary © 2009 ZTE Corporation. All rights reserved. I Product Description Version Date Author Approved By Remarks V1.00 2009-11-12 Liu Yong Hu Jian Not open to the Third Party © 2009 ZTE Corporation. All rights reserved. ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed or used without the prior written permission of ZTE. Due to update and improvement of ZTE products and technologies, information in this document is subjected to change without notice.
3.
2VGEL Technique specification II
© 2009 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary TABLE OF CONTENTS 1 Battery Model, Technical Parameters Table......................................................... 1 2 Technical Features of 2V GEL Battery.................................................................. 1 2.1 Chemistry Reaction during Charge and Discharge................................................... 1 2.1.1 Electrochemical Process in a Battery as Follow....................................................... 1 2.1.2 Chemistry Reaction of the Final Charging Stage...................................................... 2 2.2 Charging Characteristics ......................................................................................... 2 2.3 Discharging Performance........................................................................................ 3 2.4 Life.......................................................................................................................... 6 2.5 Certificate................................................................................................................ 7
4.
2VGEL Product Description ZTE
Confidential Proprietary © 2009 ZTE Corporation. All rights reserved. III FIGURES Figure 1 Curves between equalization charging voltage, current, capacity and time at different discharge depth......................................................................................................... 3 Figure 2 Discharging characteristic curves at different discharge rate at 20℃.......................... 4 Figure 3 Relationship curve between discharge capacity and temperature .............................. 5 Figure 4 Relationship curves between remaining capacity and temperature............................. 5 Figure 5 Relationship curve between OCV and DOD............................................................... 6 Figure 6 Relationship curve between floating service life and temperature............................... 6 TABLES Table 1 Storage time, recharging voltage, current and time.................................................... 3 Table 2 Relationship between discharge rate and cut-off voltage............................................ 4
5.
2VGEL Product Description ZTE
Confidential Proprietary © 2009 ZTE Corporation. All rights reserved. 1 1 Battery Model, Technical Parameters Table Model Rated Voltage Rated Capacity Dimension(mm) Weight(Kg) C10, 25℃, 1.8V Length Width Height Total Height 2V200AH 2 200 206~207 103~105 354~355 386~399 18.5~20.5 2V300AH 2 300 206~207 145~147 354~355 386~399 27~29 2V420AH 2 420 206~207 145~147 470~471 500~512 34.5~ 36.5 2V490AH 2 490 206~207 166~168 470~471 500~512 39.5~ 42 2V600AH 2 600 206~207 145~147 645~647 675~688 48~50 2V800AH 2 800 210~211 191~193 645~647 675~688 64.5~ 68 2V1000AH 2 1000 210~211 233~275 645~647 675~688 80~82 2V1500AH 2 1500 210~ 212 340~397 645~772 677~813 115~120 2V2000AH 2 2000 212~ 214 397~399 772~774 809~813 156~160 2 Technical Features of 2V GEL Battery 2.1 Chemistry Reaction during Charge and Discharge 2.1.1 Electrochemical Process in a Battery as Follow Discharge PbO2 + 2H2SO4 + Pb 2PbSO4 + 2H2O Charge From the reaction equation, the following results can be obtained: • Discharging: PbO2 in positive plate reacts with Pb in negative plates and H2SO4 in electrolyte. This reaction generates PbSO4, and the density of H2SO4 decreased. • Charging: PbSO4 is deoxidized to PbO2 and Pb, and the density of H2SO4 increased.
6.
2VGEL Technique specification 2
© 2009 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary 2.1.2 Chemistry Reaction of the Final Charging Stage 1 At the end of charging, the voltage of battery is up to a certain value, and the positive pole will give off O2, because of dissolution of water. The reaction is: H2O→2H+ +1/2O2+2e- 2 The generated O2 is transferred to the negative pole through the separators, and then reacts with Pb. 2Pb+O2→2PbO 3 PbO is alkalescence oxide, which reacts with H2SO4 immediately and generates PbSO4. PbO+H2SO4→PbSO4+H2O 4 PbSO4 is transformed into sponginess Pb via charging. PbSO4+2H+ +2e - →Pb+H2SO4 5 The reaction at the negative plate is: O2+4H + +4e - →2H2O During charging, the water wasted on positive plate will be supplemented by the water produced on negative plate, so there is no need to add water, which makes battery easy to be maintained. 2.2 Charging Characteristics • Float and equalization charging range: Float charging voltage: (2.23~2.27) V/ cell (20℃) Equalization charging voltage: (2.30- 2.35)V/ cell (20℃) • Max charging current: Float charging current: 0.20 C10 A Equalization charging current: 0.20 C10 A • Charging characteristics curves: Charging characteristics curves of 2V GEL battery at different discharge depth:
7.
2VGEL Product Description ZTE
Confidential Proprietary © 2009 ZTE Corporation. All rights reserved. 3 Figure 1 Curves between equalization charging voltage, current, capacity and time at different discharge depth • Charging temperature compensation: When the temperature is over 25℃, the float or equalization charging voltage will decrease 3mV when the temperature goes up by 1℃, and the float or equalization charging voltage will increase 3mV when the temperature goes down by 1℃. • Storage time, recharging voltage, current, time: Table 1 Storage time, recharging voltage, current and time Storage Time (Month) Recharging Voltage(V) Recharging Current(A) Recharging Time(h) Remarks 1 2.35 0.15C10 1~10h concrete time determined by the condition of the exit of average charge; Storage Time≤6 month 3 2.35 0.15C10 6 2.35 0.15C10 9 2.35 0.15C10 12 2.35 0.15C10 2.3 Discharging Performance • Rated capacity: Under condition of ambient temperature 25℃, discharging with I10 until the terminal voltage is down to 1.8V, the discharging capacity is rated capacity. • Capacity with different discharge rate(refers to YD/T 1360-2005, at 25℃) C10——rated capacity of 10 hours discharge current (A·h), the value is 1.0 C10 C3—— rated capacity of 3 hours discharge current (A·h), the value is 0.75 C10
8.
2VGEL Technique specification 4
© 2009 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary C1—— rated capacity of 1 hours discharge current (A·h), the value is 0.50 C10 Ct —— Ct is the product of discharge current I(A) multiplicative the discharge time(A·h) Ce—— actual capacity at 25℃ (A·h) I10——10 hours discharge current, the value is 1.0I10 (A) or 0.1C10 I3 —— 3 hours discharge current, the value is 2.5I10 (A) or 0.25C10 I1 —— 1 hours discharge current, the value is 5.0I10 (A) or 0.50C10 • Discharging characteristic curves: The discharge curves of 2V GEL battery at different discharge rate are shown in Figure2. Figure 2 Discharging characteristic curves at different discharge rate at 20℃ • The corresponding table between cut-off voltage and discharge rate: Table 2 Relationship between discharge rate and cut-off voltage Discharge Rate (h) Terminal Voltage (V) 1 1.75 3 1.80 5 1.80 8 1.80 10 1.80 20 1.85
9.
2VGEL Product Description ZTE
Confidential Proprietary © 2009 ZTE Corporation. All rights reserved. 5 • Relationship curve between discharge capacity and temperature: Figure 3 Relationship curve between discharge capacity and temperature The general principle is: in the working condition below 25℃, GEL battery’s effective capacity would decrease 8% when the temperature drops every 10℃. Therefore, it is necessary to consider the influence incurred by the temperature of working condition when calculating the effective capacity. • Self-discharge characteristics: The capacity could remain above 90% after storage 3 months at 25℃. • Relationship curves between remaining capacity and temperature: Figure 4 Relationship curves between remaining capacity and temperature
10.
2VGEL Technique specification 6
© 2009 ZTE Corporation. All rights reserved. ZTE Confidential Proprietary • Relationship curve between open circuit voltage and discharge depth: Figure 5 Relationship curve between OCV and DOD 2.4 Life • Design life of battery ≥ 20 years (20℃): Temperature has a great impact on battery’s cycle life. Designed life is in float charging at 20-25℃. Actual life varies with the ambient temperature. For example: as temperature increased by 10℃, the cycle life of battery decreased by 50%. • Relationship curve between float service life and temperature: Figure 6 Relationship curve between floating service life and temperature
11.
2VGEL Product Description ZTE
Confidential Proprietary © 2009 ZTE Corporation. All rights reserved. 7 2.5 Certificate • ISO9001-2000, ISO14001 Certification • TLC Certificate • UL Certificate • CE Certificate
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