Ts'ebeliso ea ho leka-lekanya lisele ka libeteri tsa lithium ke efe?

Ke qetile lilemo tse ka bang 12 ke etsa betri pack teardown le moralo oa BMS. Nako le nako ha motho e mong a mpotsa "hantle-ntle ho leka-lekanya ho etsa eng?", ke ba bontša linepe tse peli feela: e 'ngoe ke pakete ea 36 V e-baesekele ea 2-ea lilemo tse 36 e se nang ho leka-lekanya (halofo ea lisele ho 1.8 V, tse ling ke 4.18 V), e' ngoe ke beche e le 'ngoe e nang le 100 mV e sa ntse e le teng ka mor'a lilemo tse tharo. Ke eona ntlha eohle setšoantšong se le seng.

Lipaketeng tsa 'nete, lisele ha li tsoaloe li lekana. Nka 100 brand-lisele tse ncha tsa Samsung 50E ho tloha tereing e le 'ngoe: matla a pharalletseng hangata ke ±30 mAh, sekhahla sa ho itlhatsoa se ka fapana ka makhetlo a 2-3, 'me ho hanyetsa ka hare ho ka fapana 3–5 mΩ. Ka mor'a lipotoloho tse 200 ba fokolang ba salla morao le ho feta. Ntle le ho leka-lekanya, bokhoni ba pakete bo laeloa ke sele e fokolang ka ho fetisisa e lefelloang le sele e matla ka ho fetisisa ha e tsoa. O lahleheloa ke 20-40% ea bokhoni bo ka sebelisoang selemong sa pele feela.

Active Cell Balancing

Ho na le litsela tse peli feela tseo batho ba hlileng ba leka-lekaneng ka tsona tlhahisong:

Sena ke seo 95% ea lipakete tse ka tlase ho 20 kWh e se sebelisang.
Li-chips tsa 'nete u tla li bona libotong:

TI BQ769x2 / BQ769x3 / BQ78z100

Lisebelisoa tsa Analog LTC6804 / LTC6811 / LTC6813

Boholo MAX14920 / MAX14921

NXP MC33771 / MC33772

Tlhōlo e tloaelehileng ea hona joale: 80–150 mA (BQ76952 e ka sutumetsa 220 mA haeba u bapisa lithakhisa tse peli).
Boleng bo hanyetsanang tlhahisong ea bongata: hoo e batlang e le 27 Ω kapa 33 Ω 2512 1 sephutheloana sa W.
Litlhophiso tsa "trigger" tseo ke hlileng ke li sebelisang:
Qala ho tsoa mali ka 15-25 mV ka holimo ho karolelano ea pakete nakong ea CV, emisa ha delta e theoha ka tlase ho 6-8 mV.
Haeba u leka ho lelekisa 2 mV u tla pheha boto ka ho sa feleng.

Mocheso ke bothata ba sebele. Pakete ea 16s ea scooter e nang le 100 mA mali e ka lahlela 7–8 W ka kotloloho ho BMS PCB. Ke ka lebaka leo liboto tsa lie-baesekele tsa lidolara tse 20- li sothang le ho pshatleha ka mor'a lehlabula le le letsatsing.

Hang ha o feta ~ 30 kWh hoo e batlang e le motho e mong le e mong o fetohela ho sebetsa.

-mehlala ea 'nete ea lefats'e eo ke e senyelitseng:

Tesla Model S/X (2012–2021): DC e nyane-DC litene tsa HVJB, ~1 A mojuleng ka mong.

BMW i3 (lilemo tsohle): module ea inductive transformer, 24-to-1 ratio, hoo e ka bang 2 A

Lipakete tsa BYD Blade: -liboto tsa capacitor tse fofang li ipapisitse le moralo oa litšupiso oa Infineon TLF35568

Liphoofolo tsa litonanahali tsa polokelo tse sa emeng tsa Machaena: li-module tsa DC tse ikhethileng-DC tse tsamaeang 15–20 A ho pholletsa le likhoele tsa 700 V

Kantle ho-{1}}ka liboto tseo batho ba li rekang:

1–2 AliExpress e tala e fofang-liboto tsa capacitor (tse nang le li-relay tse nyane tse 8–16)

Heltec / Orion BMS Gen4 / REC Q / Dilithium: 5–8 A e nang le pholiso e ntle

Cell Balancing

Li-OEM tse ngata li leka-lekana feela ka holimo ho 10–15 % ea SoC hobane lebelo la motlakase le bataletse haholo ka tlase ho 3.45 V (NMC) kapa 3.40 V (LFP).
Tesla waits until >90% SoC mme e sebetsa feela ho leka-lekanya metsotso e 30-60 ea ho qetela ea tefo.
Li-logs tsa ka tsa BMW i3 tsa 2017 li bonts'a sekala sa inductive se tsoha feela ha delta> 30 mV ebe se paka hajoale <5 A.

Ke na le lae e tletseng liphutheloana tsa 2016–2018 tse tlase{2}} tsa EV tsa lebelo ho tsoa naheng ea China tse bolokileng $0.80 ka ho hlakola lintho tse thibelang ho tsoa mali. Ka mor'a likhoeli tse 18 lisele tse fokolang li ea mpeng ho tsoa ho hong le ho hong, koporo e qhibiliha, li-dendrites lia hola, karohano ea qhibiliha, mollo. Ke bone lipakete tsa 72 V 20 Ah li theohela ho 8–9 Ah, e ka sebelisoang ka likhoeli tse 14. Ba otle ka $12 'me ba khutlela ho 18-19 Ah. Thuto e ithutile ka thata.

Tlas'a 15 kWh → passive e lokile 'me e tla lula ka ho sa feleng (li-scooters, lisebelisoa tsa motlakase, li-drones)

400 V+ or >50 kWh → e sebetsa kapa o tla be o fapanyetsana li-module selemo se seng le se seng

EV e 'ngoe le e' ngoe e nepahetseng e rekisoang kajeno e na le ho leka-lekana. Phapang feela ke hore na ke mohanyetsi oa 33 Ω kapa boto e sebetsang ea $300.

Ke ho leka-lekanya sele. Ha ho letho la boselamose. Ho emisa feela lisele tse ntle hore li se ke tsa huleloa fatše ke moena a le mong ea botsoa ea ileng a etsa qeto ea ho tsofala kapele.

Cell Balancing