Discussion with domestic client of Shivalik from auto industry
Shunt helps measure current, both low and high amperage
Shunt is an intrusive tech- you need to put it in and measure the throb. There is non intrusive tech – hall effect sensor. Advantage of shunt Is lower cost and higher speed (Speed at which u want to measure current bandwidth) – Need high speed sensing for short circuit currents
In hall current sensor- Inaccuracy is a problem
Shunt has problem of thermal dissipation – if current flowing through go very high, this dissipates heat which could affect overall casing and architecture and cause other parts to get heated
Bigger battery or high performance battery – could go for hall current sensor. It is 3-4x more expensive than shunts however
This client will stick with shunt for now though
Use a low ohmic shunt resistor … for high current measurement impact- temp impact should be minimal to ensure drift away is lower.
Besides these 2, there are no other technology in the works.
Use Shivalik shunt resistor. Have 2 more vendors but their cost is more expensive. Also work with Vishay. Shivalik offer same specifications… peers are 3-4x more costly
Primary vendor- Shivalik, other 2 are secondary
No reliability issue faced with Shivalik in the past
BMS – Shunt costs is 8 rupees x 2 No of shunts in BMS (There can be shunt requirement outside of BMS as well)
Does product % of overall cost matter when it comes to negotiating on pricing with part supplier? OEM will attack the bigger cost Products first, but over time will squeeze the other vendors as well
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