放過電的蓄電池應(yīng)及時充電，隨著充電進(jìn)行，電池兩極的放電生成物PbSO₄與電解液中H₂SO₄發(fā)生反應(yīng)將兩極完全充電后，把原先放電時消耗的H₂SO₄又復(fù)返回，因此電解液中H₂SO₄濃度越來越濃，達(dá)到放電前電解液中H₂SO₄的濃度。
充電過程，電解液中H₂SO₄相對密度會變化，理論上和放電時電解液相對密度變化相反，伴隨著充電進(jìn)行，電解液中的水會在充電反應(yīng)中消耗，硫酸的生成與充電量成比例，即消耗0.672g/A·h水，生成3.6579/A﹒h 硫酸，生成的硫酸在電解液里快速擴(kuò)散達(dá)到濃度均一，充電量與電解液相對密度變化的關(guān)系類似于放電量與電解液相對密度變化的關(guān)系。實際上，因充電而產(chǎn)生的H₂SO₄。會在極群間滯留，由極群內(nèi)擴(kuò)散至電解液里比較慢，充電結(jié)束前．電解液中H₂SO₄濃度不可能很均勻，正好這時充電末期會發(fā)生水的電解產(chǎn)生氣體，氣體從電解液中逸出，起著攪拌作用，電解液中H₂SO₄。的均勻性會改善，這時測得的相對密度可作為充電結(jié)束的一個指標(biāo)來判斷是否還要充電。
The storage battery that passes an electricity should refresh in time, along with refresh to carry on, in battery two turning on electricity of poleses born thing PbSO4 and electrolyte the H2 SO4 occurrence reaction two after very and completely refreshing, again returned the H2 SO4 turning on electricity depletion at first, therefore the H2 SO4 densitieses in the electrolyte are more and more thick, attain before turning on electricity electrolyte in the density of H2 SO4.
Refresh process, the H2 SO4 opposite density will change in the electrolyte, theoretically and turn on electricity electrolyte the opposite density change contrary, accompany with and refresh and carry on, water in the electrolyte will be refreshing and consuming in the reaction, sulfuric acid of born with refresh and measure into a proportion, then consume a 0.672 gs|A ·h water, born 3.6579| h sulfuric acid of A ﹒ , the born sulfuric acid quickly spreads and attains a density in the electrolyte uniform, refresh and measure and electrolyte the opposite density change of relation similar in turn on electricity and measure and electrolyte the opposite density change of relation.Actually, because of refresh but produce of H2 SO4.Meeting at pole cluster be detained, from spread into electrolyte slower inside the cluster very much, before refreshing be over.the H2 SO4 densitieses in the electrolyte are impossibly very even, at the right moment at this time refresh will take place in last phase the aqueous electrolysis creation air, the air diverts from the electrolyte and mixs blend a function, in the electrolyte H2 SO4.Of the even will improve and measure at this time of the opposite density can be an index sign that refreshes be over to judge whether still need to refresh.

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