Order Online - BMS for Li-Ion Battery Packs
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Current-Logic.com now provides a series of Balancing Board for Li-Fepo4 Battery Packs or Li-CO2/Li-MnO2/Li-NiCoMn based battery packs, and full Li-Ion battery management system (BMS) that include active balancing as well as temperature monitoring, charging, and other features to maximize the life of a battery pack.
Battery balancing and battery redistribution can maximize a battery's capacity to make better use of its energy available and increase the battery's lifetime. It is also called battery balancer or battery regulator. Balancers are often found in Lithium ion battery packs for cell phones and laptop computers, and electric vehicle battery packs. Generally every Lithium ion battery packs should have balancer for safety and effeciency reasons.
Usually, different cells in a battery pack may be at different levels of state of charge (SOC). Without redistribution, the cell with the lowest capacity will go empty sooner, and the whole battery pack will stop outputing(even though other cells are still not empty); this limits the energy that can be taken from the battery.
Without balancing, the cell of smallest capacity can be easily overcharged or over-discharged while cells with higher capacity undergo only partial cycle. For the higher capacity cells to go full charge/discharge cycle of the largest amplitude, balancer should ¡°protect¡± the weaker cells; so that in a balanced battery, the cells with the largest capacity can be fully filled and will not overcharg any other weaker/smaller cell, and they can power out without over-discharging any other weaker/smaller cell. Battery balancing is done by transferring energy from or to individual cells, until the SOC of the cell with the lowest capacity is equal to the battery's SOC.
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603FV1
This spec is an example of balancing board for a battery pack contains 6 polymer lithium ion batteries (rated 4.2V) in series. We also have balancing board for battery packs with 3-17 cells (common types like 3.6V, 3.7V, 4.2 etc) in series connection
The upper one is sealed with metal shield, which provide extra protection and heatsink for the balancing board
The lower one shows the inside structure. Each battery cell is monitored/protected by complete circuit.
The high lighted fields are the key parameters when choosing a battery balancer.
Because now most battery cells are made to a standard, in most cases, to choose a battery protector, user only need to know how many cells are in the battery pack, and what is the cell type.
Usually user can pick a protector by "My battery pack is using xx cells of xxV in series" |
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Details |
Min. |
Typ. |
Max |
Error |
Unit |
| Battery Gas |
Polymer |
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| Battery Links |
6S/1P |
|
Absolute Maximum Rating |
| Input Charging Voltage |
|
25.2 |
|
¡À1% |
V |
| Input Charging Current |
|
2 |
5 |
|
A |
| Output Discharging Voltage |
2.50 |
|
4.20 |
|
V |
| Output Discharging Current |
|
5 |
10 |
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| Continuous Output Discharging Current |
10 |
A |
Ambient Condition |
| Operating Temperature |
-10 |
|
65 |
|
¡æ |
| Humidity (No Water-Drop) |
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RH |
Storage |
| Temperature |
-40 |
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75 |
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¡æ |
| Humidity (No Water-Drop) |
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RH |
Protection Parameters (for Individual Cell). |
| Over-Charge Voltage Protection (OVP) |
4.175 |
4.250 |
4.275 |
|
V |
| Over-Charge Voltage Protection Release (OVPR) |
4.180 |
4.190 |
4.200 |
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V |
| Over-Discharge Voltage Protection (UVP) |
2.550 |
2.500 |
2.450 |
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V |
| Over-Discharge Voltage Protection Release (UVPR) |
2.950 |
3.000 |
3.050 |
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V |
| Over-Current Charge Protection (OCCP) |
None (this is duplicated with SC protection, can be set to customer's requirements) |
A |
| Over-Current Discharge Protection (OCDP) |
35 |
40 |
48 |
|
A |
| Over-Current Protection Delay Time(OCPDT) |
10 |
20 |
40 |
|
mS |
| Over-Current Discharge Protection Release |
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| Short circuit current protection |
180 |
200 |
250 |
|
A |
| Short circuit current protection delay time |
200 |
250 |
350 |
|
uS |
| Short circuit protection Release |
Cut off Load |
| Charging and Discharging Temperature |
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¡æ |
| Charging and Discharging Temperature Protection Release |
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¡æ |
| Balance Temperature |
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¡æ |
| Balance Temperature Protection Release |
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¡æ |
| Cell balance |
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| BleedStartPoint |
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4175 |
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mV |
| BleedAccuracy |
|
10 |
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mV |
| BleedCurrent |
45 |
55 |
60 |
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mA |
| Balance Mode |
Charging |
Current Consumption |
| Normal Mode |
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uA |
| Idle mode |
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100 |
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uA |
| Sleep mode |
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uA |
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