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1、J IS JAPANESE I N D USTR IAL STANDARD Translated and Published by Japanese Standards Association Method of measuring discharge capacity of hydrogen absorbing alloys for a negative electrode of a rechargeable nickel-metal hydride battery ICs 29.220.99; 77.150.40 Reference number : JIS H 7205 : 2003 (
2、E) PROTECTED BY COPYRIGHT 7s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 23:02:42 MDTNo reproduction or networking permitted without license from IHS -,-,- H 7205 : 2003 Foreword This t
3、ranslation has been made based on the original Japanese Industrial Standard established by the Minister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law. Attention is drawn to the possibility tha
4、t some parts of this Standard may conflict with a patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have technical properties. The relevant Minister and the Japanese Industrial St
5、andards Committee are not responsible for identifying the patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have the said technical properties. This Standard may include hazardous
6、 materials, methods or apparatus, however, does not cope with all the safety problems. The users of this Standard must have responsibility for security against the adequate safety and the health management, and decision of the appropriate applicable limits in the application of this Standard. Date o
7、f Establishment: 2003-03-20 Date of Public Notice in Official Gazette: 2003-03-20 Investigated by: Japanese Industrial Standards Committee Standards Board Technical Committee on Non-Ferrous Metals JIS H 7205 : 2003, First English edition published in 2003-10 Translated and published by: Japanese Sta
8、ndards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA 2003 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
9、 or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Ber
10、nie Not for Resale, 03/12/2007 23:02:42 MDTNo reproduction or networking permitted without license from IHS -,-,- H 7205 : 2003 Contents 1 2 3 4 5 6 7 7.1 7.2 7.3 8 8.1 8.2 8.3 8.4 8.5 9 Scope Normative references Definitions Tolerance . Test apparatus . Test preparation Test method Electrochemical
11、activation treatment Discharge rate characteristics . Acceleration of electrochemical activation Treatment of test results .; Calculation for discharge capacity . Discharge capacity of sample alloy Expression of the diagram for discharge rate characteristics Expression of the diagram for repetitive
12、charge and discharge characteristics in electrochemical activation Expression of discharge curve diagram . Report Page 1 1 1 2 2 4 5 5 6 6 6 6 7 7 7 7 7 (i PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wi
13、ng, Bernie Not for Resale, 03/12/2007 23:02:42 MDTNo reproduction or networking permitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS H 7205 : 2003 Method of measuring discharge capacity of hydrogen absorbing alloys for a negative electrode of a rechargeable nickel-metal hydride
14、battery 1 Scope This Japanese Industrial Standard specifies the method of measuring discharge capacity of hydrogen absorbing alloys necessary for designing nickel-metal hydride battery by judging applicability of hydrogen absorbing alloys to the nega- tive electrode of nickel-metal hydride battery.
15、2 Normative references The following standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. The most recent editions of the standards (including amendments) indicated below shall be applied. JIS B 7411 Solid-stem general purpose liquid-in-glas
16、s thermometers JIS C 1102-2 Direct acting indicating analogue electrical measuring instruments and their accessories Part 2 : Special requirements for ammeters and voltmeters JIS H 7003 Glossary of terms used in hydrogen absorbing alloys JIS H 7201 Method of determining the PCT relations of hydrogen
17、-absorbing alloys JIS Z 8401 Guide to the rounding of numbers JIS Z 8801-1 Test sieves-Part 1 : Test sieves of metal wire cloth 3 Definitions For the purposes of this Standard the definitions in JIS H 7003, and the following shall apply. a) discharge capacity (C,) In a certain sample hydrogen absorb
18、ing alloys elec- trode, a quantity of electricity per unit mass of hydrogen absorbing alloys which is introduced electrically until completion of discharge reaction generally repre- sented by the formula (1) (Ahkg). H(in alloy) + OH- + HzO + e- (1) b) calculation capacity (Ccd Discharge capacity of
19、sample alloy to be expected from pressure-composition isotherm of sample hydrogen absorbing alloys (here- after referred to as “sample alloy”) (Ahkg). When the percentage in mass of hydrogen to alloy which is measured from pressure-composition isotherm of sample alloy at 60 “C and 0.5 MPa based on J
20、IS H 7201 as W, the calculation capacity (Ccaic) is obtained according to the formula (2). . (2) W Ccalc = 26 800 X - 100 where, Ccalc : calculation capacity ( A h k g ) W : percentage of hydrogen to alloys (%) PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under lic
21、ense with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 23:02:42 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 H 7205 : 2003 c) electrochemical activation bilized electric capacity is obtained. Charge and discharge are repeated until
22、 a sta- 4 Tolerance A controlled value or a measured value shall be within the follow- ing tolerance ranges. a) Set voltage al % b) Set current -tl% c) Quantity of electricity t 1 % d) Temperature + 1 “C e) Time k0.1 % 0 Mass k l m g Those tolerances mean general precision to be generated by the sou
23、rce for gen- erating all errors in the measuring instrument, measuring technique to be used, and the procedure of a test. 5 Test apparatus The basic structure of a test apparatus is shown in Fig. 1. The test apparatus shall be composed of a charging and discharging apparatus Fig. 1 a) for charging a
24、nd discharging the test cell comprising a d.c. constant current power source, an ammeter and a voltmeter, and a test cell Fig. 1 b) or c) open to the atmospheric pressure. The test cell shall be installed in a room capable of keeping a peripheral temperature at 20 “C to 25 “C. PROTECTED BY COPYRIGHT
25、 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 23:02:42 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 H 7205 : 2003 !I I a) Chargingand I- discharging e Sepa
26、rator J I 1 Separator electrode Separator Luggin Test b) Three-Pole me capillary electrode c) Two-pole type test ceil test cell Remarks : Connection from the charging and discharging apparatus Fig. 1 a ) to the test cells Fig. 1 b)I Fig. 1 c) shall be carried out as shown by the solid line for three
27、-pole type test cell and as shown by the bro- ken line for two-pole type test cell. Fig. 1 Electrode testing apparatus Test cell Either of the test cells stated below shall be used. One is a three-pole type test cell Fig. 1 b) consisting of a test sample alloy electrode containing a sample alloy (he
28、reafter referred to as “test electrode”), a reference electrode made of mercury oxide electrode, a counter electrode made of any one of a nickel hy- droxide electrode, a nickel plate or a platinum plate, and a separator between the test electrode and the reference electrode, and the counter electrod
29、e. The other is a two-pole type test cell Fig. 1 c) consisting of the test electrode, a nickel hy- droxide electrode having a discharging capacity of at least twice the calculated capacity of the test electrode and a separator. DC constant current power source A stabilized d.c. constant current powe
30、r source capable of being set at any current value, shall be used. Time meter A measuring instrument for time shall have a tolerance speci- fied in 4 e) or at least equivalent in precision thereto. Voltmeter An instrument to be used for measuring a voltage shall be an ana- logue type voltmeter of cl
31、ass 0.5 in rank specified in JIS C 1102-2 or a digital type voltmeter having a precision at least equivalent thereto. An input resistance of the voltmeter shall be at least 1 GR in the case of measuring a voltage between PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS
32、 under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 23:02:42 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 H 7205 : 2003 a test electrode and a reference electrode in three-pole type test cell, and at least 100 kO in th
33、e case of measuring the voltage between a test electrode and a counter electrode in two-pole type test cell. e) Ammeter An instrument to be used for measuring a current shall be an ana- logue type ammeter of class 0.5 in rank specified in JIS C 1102-2 or a digital type ammeter having a precision at
34、least equivalent thereto. Thermometer An instrument to be used for measuring a temperature shall be a solid-stem general purpose liquid-in-glass (all immersion) of zk 1 “C in tol- erance specified in JIS B 7411 or having a precision equivalent thereto, or a digital type thermometer of 1 O C or lower
35、 in the minimum value. The absolute precision of the digital type thermometer shall be k0.5 “C. f) 6 Test preparation The test preparation shall be as follows. When the sample alloy powder is extremely oxidized by oxygen in the air, the following operations shall be carried out in the atmosphere of
36、inert gas. a) Surface preparation for sample alloy powder Grind a sample alloy pre- liminarily classified to a particle size for passing all through the wire sieve of 149 pm in aperture specified in JIS Z 8801-1 with a mortar for about 5 min. Weighing out of sample alloy powder and copper powder and
37、 mixing Weigh out the sample alloy powder and copper powder to the nearest 1 mg so that the mass ratio Xa of the sample alloy powder and the copper powder which is ob- tained by the formula (3) becomes (25 I 1) %. After recording, mix them with a mortar for about 5 min. The copper powder used in thi
38、s case shall be 5 pm or less in average particle size and not more than 0.4 % in reduction loss. b) . x 100 (3) Ma M a + M C Xa = where, Xa : mass ratio of sample alloy powder to copper pow- der (%) Ma : mass of mixed sample alloy powder (kg) Mcu : mass of mixed copper powder (kg) c) Preparation of
39、pellet Weigh out about 1 g of the mixed powder prepared in b), and fill into a mold of 12 mm to 15 mm in diameter. After leveling the up- per surface of the powder, prepare a pellet by pressing with a load of 50 kN to 100 kN per 1 cm2. Weigh the mass of the pellet to the nearest 1 mg. Obtain the mas
40、s (ma) of sample alloy in the pellet to the nearest 100 yg by the formu- las (3) and (41, and record to the nearest 1 mg by rounding it off according to JIS Z 8401. Further, measure the thickness of the pellet to the nearest 0.01 mm and record it. (4) . ma=Mx- Xa 100 where, ma: mass of sample alloy
41、in the pellet (kg) xa : mass ratio of sample alloy powder to copper pow- der obtained in b) (%) M : mass of pellet (kg) PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/200
42、7 23:02:42 MDTNo reproduction or networking permitted without license from IHS -,-,- 5 H 7205 : 2003 d) Preparation of test electrode Pinch the pellet prepared in c) with a nickel net of an appropriate aperture, and fix the pellet by spot welding of the periph- ery. Further, weld a nickel wire as a
43、lead wire or a nickel plate (either is not less than 0.5 mm2 in sectional area and not more than 15 cm in total length) to a nickel net wherein the pellet is pinched to make a test electrode. The test electrode is shown in Fig. 2. .ckel net Remarks : The X is the position of spot welding. Fig. 2 Tes
44、t electrode Assembly of test cell Attach the electrode prepared in d) to a test cell and inject potassium hydroxide aqueous solution of 6 mol/dm3 in concentration as an electrolyte. After standing still, the completed test cell at a test position for not less than 30 min, carry out the test. e) 7 Te
45、st method 7.1 Electrochemical activation treatment 7 . 1 . 1 Charge and discharge cycle Connect the test cell assembled in 6 e) to the charge and discharge apparatus as given in Fig. 1, make charge, pause of charge, discharge under the following conditions of a) to c) as one cycle, and repeat by mak
46、- ing 20 cycles the upper limit. a) Charge Introduce the quantity of electricity of 1.2 times the calculated ca- pacity (Ccaic) at 100 A/kg in current density per sample alloy. During the charge, record deterioration with age of an electrode potential or a terminal voltage. Obtain the charge time tc
47、 (h) from the formula (5). (5) . 1.2 CeAc 100 t c = where, tc : charge time (h) Ccale : calculated capacity (Ahkg) b) Pause of charge 30 min c) Discharge Carry out discharge at 100 A/kg in current density per sample alloy until the potential of the test electrode becomes -0.65 V to a mercury oxide e
48、lec- trode for three-pole type test cell or until the terminal voltage becomes 0.8 V PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/12/2007 23:02:42 MDTNo reproduction or networking permitted without license from IHS -,-,- 6 H 7205 : 2003 for a two-pole test cell, and record deterioration with age of electrode potential or terminal voltage and discharge duration t d (h). Obtain a current I