Lithium battery-a cell balancing hman dan chu eng nge ni?
Cell balancing .
Kum 12 dawn lai battery pack teardown leh BMS design ka lo ti tawh a. Miin "Balancing hian eng nge a tih tak tak? Chu chu thlalak pakhata a thupui ber chu a ni.
Pack tak takah chuan cell te hi an piang vek ngai lo. Tray khat atanga Samsung 50E thar 100 brand-New Samsung 50E cells te hi la rawh: capacity spread chu a tlangpuiin ±30 mAh a ni a, self-discharge rate hi a let 2–3 in a danglam thei a, internal resistance pawh 3–5 mΩ a danglam thei bawk. Cycle 200 hnuah chuan chak lo zawkte chu an tlahniam lehzual ta zawk a ni. Balancing tel lovin pack capacity chu charge-a cell chak lo ber leh discharge-a cell chak berin a dictated a ni. Kum khatnaah chauh khan 20–40 % hman theih capacity i hloh a ni.
Mite’n production-a an balance tak tak dan kawng hnih chauh a awm:
1. Passive (Bleed) Balancing .
Hei hi 20 kWh hnuai lam pack 95 % hman a ni.
Chips tak tak board-a i hmuh tur:
A rilru a buai em em a, a rilru a hah em em bawk a.
A rilru a buai em em a, a rilru a hah em em bawk a. LTC6804 / LTC6811 / LTC6813
A rilru a buai em em a.
NXP MC33771 / MC33772 a ni.
Typical bleed current: 80–150 mA (BQ76952 hian pin pahnih i parallel chuan 220 mA a push thei).
Mass production-a resistor value: 27 Ω emaw 33 Ω 2512 1 W package emaw a ni deuh ber.
Trigger settings ka hman tak tak chu:
CV chhunga pack average aia 15–25 mV-a thisen chhuak tan la, Delta 6–8 mV hnuai lam a tlak hunah chawlhsan rawh.
2 MV chase i tum chuan board chu chatuan atan i siam mai ang.
Heat hi harsatna tak tak a ni. 16S scooter pack 100 MA bleed nei chuan 7–8 W chu BMS PCB-ah a dump nghal thei. Chuvangin, chu man tlawm 20-dollar e-bike boards te chu ni chhuahnaah thlasik khat hnuah an warp leh crack thin.
2. Active balancing .
Vawikhat ~30 kWh aia sang i kal chuan mi zawng zawng deuhthaw chu active ah an inthlak thin.
Real-Khawvel entirnan ka tihchhiat tawh:
Tesla Model S/X (2012–2021): HVJB-a DC{2}}DC brick te tak te, ~1 a module khatah
BMW I3 (kum zawng zawng): inductive transformer module, 24-to-1 ratio, 2 a vel a ni.
BYD Blade Packs: Flying-Capacitor boards infineon hmanga siam Tlf35568 Reference Design
Chinese stationary storage monsters: isolated DC-DC module 15–20 A kal 700 V string pum puiah
Off-the-shelf boards miten an lei tak tak:
1–2 A green aliexpress flying-Capacitor boards (relay te te 8–16 nei te)
Heltec / Orion BMS Gen4 / Rec Q / Dilithium: 5–8 a a cooling tha tak nen.
Car tak takah chuan trigger strategy a awm a.
OEM tam zawk chuan SOC-a top 10–15 %-ah chauh balance an nei a, a chhan chu voltage curve hi 3.45 V (NMC) emaw 3.40 V (LFP) aia hniam lutuk a nih vang a ni.
Tesla waits until >90 % SOC a ni a, a hnuhnung ber 30–60 min charge chhung chauh balancing a nei.
Ka 2017 BMW i3 logs ah chuan inductive balancer chu delta > 30 mV leh pack current < 5 a harh chhuah chauh a ni.
I cheap out leh skip balancing i tih hian eng nge thleng .
Kum 2016–2018 chhunga low-speed EV packs atanga drawer khat ka nei a, chu chuan bleed resistors te delete in $0.80 a humhim a ni. Thla 18 hnuah chuan cell chak lo chu discharge apiangin negative an ni a, copper a dissolve a, dendrites a lo thang lian a, separator a melt a, mei a kang thin. Thla 14 chhunga hman theih 72 V 20 AH packs drop to 8–9 AH. An chungah $12 active balancer pakhat slap la, 18–19 ah an rawn kir leh ang. Zirna harsa tak chu a harsa hle.
A hnuai lam line .
15 kWh → Passive hi a tha a, chatuan atan a awm reng ang (scooters, power tools, drone)
400 V+ or >50 kWh → active emaw kum tin module i swap dawn emaw
Tunlaia EV dik tak hralh apiangin balancing an nei vek. Variable awm chhun chu 33 Ω resistor nge $300 active board a nih leh nih loh a ni.
Chu chu cell balancing a ni. Engmah magical lo. Cell tha tak takte chu kum upa zawk tura thutlukna siamtu unau pakhat lazy tak chuan a hruai thlak loh nan a titawp mai a ni.
