Nsonsonoe a ɛda emu resistance ne impedance ntam ntease ho hia ma obiara a ɔde UPS batere, BMS nhyehyɛe, anaa power electronics yɛ adwuma. Bere a wɔtaa de di dwuma de sesa wɔn ho wɔn ho no, wogyina hɔ ma anyinam ahoɔden ahorow a ɛsono emu biara titiriw – biako ma DC amansin, biako ma AC. Saa akwankyerɛ yi de ntotoho a emu da hɔ, mfiridwuma mu a ɛkyerɛ mfaso a ɛwɔ so ma batere a wɔhwɛ so ma.
Internal resistance yɛ ɔsɔretia a ɛne current flow wɔ battery mu bere a wɔde direct current (DC) di dwuma no. Ɛfiri electrolyte, electrode, ne emu nkitahodi ahorow a ɛko tia no mu. Mfinimfini ahoɔden a ɛko tia yɛ dodow ankasa (sɛ nhwɛso no, 5.3 mΩ) na ɛnsakra ne mpɛn dodow. Ɛyɛ nneɛma a ɛho hia sen biara a ɛkyerɛ batere akwahosan no mu biako – nkɔanim a ɛba wɔ emu ahoɔden a ɛko tia mu no taa kyerɛ sɛ sulfation, grid corrosion, anaasɛ tumi a ɛyera.
Impedance yɛ ɔsɔretia a ɛwɔ alternating current (AC) a ɛwɔ circuit bi mu nyinaa. Ɛka ho ne resistance (ɔfã ankasa) ne reactance (ɔfã a wɔde adwene yɛ, efi capacitance ne inductance). Impedance gyina frequency so na wɔda no adi sɛ akontaahyɛde a ɛyɛ den (R + jX). Wɔ battery monitoring mu no, wɔde AC impedance susudua di dwuma de hwɛ emu su ahorow a wɔmfa battery no nkɔ.
Table 1: Nsonsonoeɛ titire a ɛda emu resistance (DC) ne impedance (AC) ntam wɔ anyinam ahoɔden mfiridwuma mu.
| Aspect of Electrical Property | Mfinimfini Nneɛma a Ɛko Tia (R) | Impedance (Z) . |
|---|---|---|
| Circuit Dwumadie a Wɔde Di Dwuma | Wɔde di dwuma titiriw wɔ amansin a ɛyɛ adwuma wɔ direct current (DC) so. | Wɔde di dwuma titiriw wɔ amansin a wɔayɛ ama alternating current (AC) mu. |
| Ɔmansin a Ɛwɔ Hɔ | Wotumi hu wɔ alternating current (AC) ne direct current (DC) circuits nyinaa mu. | Ɛyɛ alternating current (AC) circuits nkutoo, a enni DC mu. |
| Abɔseɛ | Efi nneɛma a esiw anyinam ahoɔden a ɛsen no kwan mu. | Ɛsɔre fi nneɛma a wɔaka abom a ɛko tia anyinam ahoɔden no na ɛyɛ n’ade. |
| Nkontaabu mu Nkyerɛkyerɛmu | Wɔde akontaahyɛde ankasa a ɛyɛ pintinn na ɛkyerɛ, sɛ nhwɛso no, 5.3 mΩ. | Wɔnam akontaahyɛde ankasa ne nneɛma a wɔde wɔn adwene bu nyinaa so da no adi, a wɔde R + jX yɛ ho nhwɛso. |
| Mpɛn dodow a Wɔde Di Dwuma | Ne bo kɔ so yɛ nea ɛkɔ so daa ɛmfa ho mpɛn dodow a DC current no ba. | Ne bo no sakra bere a AC current no mpɛn dodow a ɛsakra no. |
| Phase Su a Ɛwɔ Hɔ | Ɛnkyerɛ phase angle anaa magnitude su biara. | Nea ɛda nsow ne sɛ ɛyɛ phase angle a ɛyɛ pintinn ne ne kɛse. |
| Suban wɔ Electromagnetic Field mu | Ɛda tumi a ɛyera nkutoo adi bere a ɛda anyinam ahoɔden a ɛwɔ anyinam ahoɔden mu no adi no. | Kyerɛ tumi a wɔsɛe no ne tumi a wɔde sie ahoɔden wɔ anyinam ahoɔden mu nyinaa. |
Wɔ nnɛyi Battery Management Systems (BMS) mu no, wɔhwɛ emu ahoɔden a ɛko tia ne nea ɛko tia nyinaa so de yɛ battery akwahosan ho mfonini a edi mũ. Nneɛma a ɛko tia nneɛma a ɛwɔ nipadua no mu a ɛkɔ soro no yɛ kɔkɔbɔ a wɔde ma ntɛm wɔ ɔsɛe ho, bere a impedance spectroscopy betumi ada nnuru mu nsakrae adi. DFUN BMS de AC susuw akwan a ɛyɛ pɛpɛɛpɛ di dwuma de di emu ahoɔden a ɛko tia no akyi na wohu anomalies ansa na ɛde huammɔdi aba.
DFUN BMS de fixed-frequency AC current di dwuma wɔ battery cell biara mu na ɛsusuw voltage a ɛba fam a efi mu ba no. Wɔde Ohm mmara na ɛbu emu ahoɔden a ɛko tia no, a ɛyɛ pɛpɛɛpɛ ±1-2%. Saa kwan yi nyɛ nea wɔde hyɛ mu, enhia sɛ wotwa batere no mu, na ɛma wonya bere ankasa mu nsɛm a wɔde besiesie a wɔahyɛ ho nkɔm.
Mfinimfini resistance (R) yɛ DC su a ɛsɔre tia current flow, bere a impedance (Z) yɛ AC su a ɛka resistance ne reactance nyinaa ho.
Nneɛma a ɛko tia batere a ɛkɔ soro no yɛ nneɛma a edi kan a ɛkyerɛ sɛ batere no sɛe, sulfation, ne ahoɔden a ɛyera no mu biako.
DFUN BMS de fixed-frequency AC current injection kwan di dwuma de susuw emu resistance a ɛyɛ pɛpɛɛpɛ 1-2%, a entwa battery adwumayɛ mu.
