隨著船舶蓄電池在放電過(guò)程進(jìn)行中，其電解液相對(duì)密度也在不斷地下降，可以利用電解液相對(duì)密度推知其放電量。根據(jù)放電反應(yīng)，電解液中H₂SO₄ 消耗在兩極活性物質(zhì)的反應(yīng)上，它生成水與放電產(chǎn)物PbSO₄ .電解液中H₂SO₄的消耗與放電電量成比例，即每安時(shí)消耗3 . 6579 H₂SO₄就生成0.672g水。

船用蓄電池濃度與相對(duì)密度的關(guān)系，在電池使用的HZ 50 。濃度范圍內(nèi)有一個(gè)如下近似于二次函數(shù)的關(guān)系式。
           S20 = 3.076X10^-1P² + 6.439 X 10^-1P+ 0.998
可以從電解液相對(duì)密度的變化量與放電量之間得到一定關(guān)系。但電解液相對(duì)密度又與溫度變化存在一定關(guān)系，電池電解液溫度通常以20℃ 為基準(zhǔn)，實(shí)際使用時(shí)并非20℃ ，因此20℃ 以外的溫度可以換算為20℃ 時(shí)相對(duì)密度值。
S20=S_t+0.0007（t-20）
式中，S₂₀為換算成20℃ 時(shí)相對(duì)密度值；S_t為在t℃ 時(shí)實(shí)測(cè)相對(duì)密度值；t為電解液溫度，℃ 。

Along with ships storage battery in progress in the process of turning on electricity, the its electrolyte opposite density is constantly also descending, can make use of opposite density of electrolyte to push to know that it turns on electricity quantity.According to turning on electricity reaction, the H2 SO4 consumes on the reaction of two most live materials in the electrolyte, it born water with turn on electricity the outcome PbSO4.In the electrolyte the depletion of H2 SO4 with turn on electricity an electricity to measure into a proportion, namely each Anne consume 3.6579H2 SO4 born 0.672 g water.

The ship is used the relationship with opposite density of the storage battery density, use in the battery of HZ 50.There is a relation type that as follows is looked like to a quadratic function inside the density scope.
S20 = 3.076X10-1P2 + 6.439 X 10-1P+ 0.998
Can the amount of variety from the electrolyte opposite density with turn on electricity an of quantity to get certain relation.But electrolyte the opposite density change with temperature to exist again certain relation, the battery electrolyte temperature usually takes 20 ℃ as basis and physically use not 20 ℃ , therefore 20 ℃ outside of the temperature can convert to 20 ℃ opposite density value.
The S is 20= Sts+0.0007(t-20)
In the type, S20 for convert to 20 ℃ opposite density value;The St is worth for in the t ℃ actually measuring opposite density;The t is an electrolyte temperature, ℃.

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