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淺談聚合物鋰電池電芯結(jié)構(gòu)圖

2022-06-10

聚合物鋰電池

聚合物鋰電池電芯由正負(fù)極極片、隔膜、極耳、包裝膜和電解液等重要部分組成,各個(gè)部分都發(fā)揮著各自的作用。

1、正極片:將正極材料涂在鋁箔上再?zèng)_壓成型。

2、負(fù)極片:將正極材料涂在銅箔上再?zèng)_壓成型。

3、極耳:其主要工作是將內(nèi)部正負(fù)極的電能傳輸?shù)酵獠侩娐?。鋰電池的極耳的正極為鋁帶,負(fù)極為鎳帶??紤]到與鋁塑包裝膜的密封,在密封件上有一層電極耳膠。由于陽極鋁帶容易斷裂,因此在加工、運(yùn)輸、儲(chǔ)存和使用過程中要特別注意保護(hù)。

4、隔膜:其置于正極片和負(fù)極片之間,主要是將正極和負(fù)極分開,避免兩極直接接觸造成短路。隔膜沒有導(dǎo)電性,但允許通過電解質(zhì)離子。

5、電解液:電解液在電池中作為能量傳遞的載體。鋰離子電池具有3-4.2V的高電壓,所以只能使用有機(jī)溶劑,不能使用水溶液電解質(zhì)。鋰電池的電解質(zhì)一般都具有電導(dǎo)率高、化學(xué)和電化學(xué)穩(wěn)定性高、溫度范圍寬、安全性好、價(jià)格便宜等特點(diǎn)。

6、包裝膜:聚合物鋰電池采用鋁塑復(fù)合薄膜包裝,可分為三層,中間層為鋁層,具有隔潮作用,外層為橡膠層,可保護(hù)鋁不被外界環(huán)境氧化,內(nèi)層為膠層,密封并防止電解液腐蝕鋁層。


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