Overview
The JIKONG JKBMS JK-QB2A8S20P-CR is an active balance smart BMS (battery management system) for building and managing 3S to 8S battery packs, with 200A continuous charge/discharge capability and 2A active balancing. It supports RS485 communication by default, CAN Bus support, a heating function, and built-in Bluetooth for Android/iOS monitoring.
Key Features
- Battery strings support: 3S to 8S (Li-ion / LiFePO4); 7S to 8S (LTO)
- Active balance (Full State On), balance current: 2000mA (2A)
- Continuous charge current: 200A; continuous discharge current: 200A
- Maximum discharge current (MAX 2min): 350A
- Wiring output / wiring method: Common Port (same port)
- Built-in Bluetooth; supports Android / iOS phone
- Interfaces: RS485 (default); CAN Bus and Heating supported
- Protection and monitoring support: short circuit protection, temperature protection, coulomb counter
Specifications
| Model | JK-QB2A8S20P; JK-QB2A8S20P-CR |
| Number of Battery Strings (Li-ion) | 3S-8S |
| Number of Battery Strings (LiFePO4) | 3S-8S |
| Number of Battery Strings (LTO) | 7S-8S |
| Power supply mode | The battery pack is self-powered |
| Balance method | Active Balance (Full State On) |
| Balance current | 2A (2000mA) |
| Continuous charge current | 200A |
| Continuous discharge current | 200A |
| Maximum discharge current (MAX 2min) | 350A |
| Over charge protection current (ADJ) | 10-200A |
| Conductive resistance in main circuit | 0.3mΩ |
| Wiring output / wiring method | Common Port (same port) |
| Single cell voltage detection range | 0-5V, error <10mV over full operating range; typical error value <5mV |
| Single Cell Voltage Range | 1-5V |
| Support single cell voltage dropout detection | Yes |
| Voltage acquisition accuracy | ±5mV |
| Total voltage detection range | 0-100V, <0.5%FSR (FSR=full scale) |
| Current Sense Shunt | -150A~300A, error <0.5%FSR |
| SoC estimation accuracy | Error <8% (operating conditions) |
| Battery remaining capacity accuracy | Error range is less than 8% |
| Total Cycle AH cumulative value | Half of the charge/discharge value |
| Over charge protection voltage | 1.2-4.35V Adjustable |
| Over charge release voltage | 1.2-4.35V Adjustable |
| Over discharge protection voltage | 1.2-4.35V Adjustable |
| Over discharge release voltage | 1.2-4.35V Adjustable |
| Over current detect delay | 2~120S Adjustable |
| Temperature detection | -40 to 125°C |
| Quantity of temperature detection | 3 pcs |
| Temp protection | YES |
| Short circuit protection | YES |
| Coulomb counter | YES |
| Bluetooth function | Bluetooth built-in; support for Android & iOS phone |
| Other interfaces (Default) | RS485 |
| Other interfaces (Customized) | CANBUS/HEAT |
| Operating power consumption | <5mA (without communication) / 15mA (485/CAN) |
| Standby power consumption | <2mA |
| Operating temperature | -40 to 85°C |
| Storing temperature | -40 to 95°C |
| Size | 228*120*22mm |
Communication, Heating, and LCD Port Notes (from provided material)
- CANBUS: Need customization
- RS485: By default
- LCD: By default
- Heat function: Need customization
Connector pin labels shown in provided material
- CANBUS: GND, CAN_H, CAN_L
- RS485: GND, RX, TX, VCC
- LCD: K-, K+, GND, B, A, VCC
Bluetooth App Notes (from provided material)
- Download the specified Bluetooth application and activate the BMS.
- Open the Bluetooth application and find the relevant serial number, then data can be checked.
Protection Functions (Six Security Protection)
- Over charge protection: Prevent over-charging affects battery life
- Short circuit protection: Automatic protection when short circuit protection
- Over discharge protection: Prevent the battery from running out
- Over current protection: Prevent the current from exceeding the battery range
- All-in protection: Prevent cable drop or poor contact
- Over temp protection: Prevent the battery from over heating
Smart Energy Working Mode Switching (from provided material)
- Storage Mode: In transportation, storage, offline or wireless transmission off mode, the BMS is in storage mode, which does not consume battery pack current.
- Normal Working Mode: When the charger is inserted in the storage mode and off mode, the BMS will immediately return to the normal working mode, and all the protection functions, equalization functions and communication functions will return to normal working.
- Shutdown: To prevent the BMS from wasting power for a long time and damaging the battery pack, the BMS has an automatic shutdown voltage, and the BMS automatically shuts down when a cell falls below the shutdown voltage.
- Standby Mode: When the battery pack is in the static state (no charge and discharge current and no equilibrium current), the BMS will automatically enter the standby state after the set time (1-30 days can be set) is exceeded.
Applications
- DIY battery packs using LiFePO4, Li-ion, or LTO chemistry within the supported string counts
- Energy storage battery packs requiring RS485/CAN monitoring, active balancing, and high continuous current capability
For wiring and configuration assistance (including CANBUS/HEAT customization questions), contact service@tsolar.top or visit https://tsolar.top/.
Additional Model References Appearing in the Provided Materials (for identification only)
- JK-BD6A17S6P: Active Balance BMS; Active Balance Current: 0.6A; Adapt Battery Strings: 10S-17S (LTO), 7S-17S (Li-ion), 8S-17S (Lifepo4); Continuous Discharge/Charge Current: 60A. Device label text includes: “Smart Active Balance BMS”, “Type: JK-bd6a17s6p”, “Balance Method: Active Balance”, “Balance Current: 0.6A”, “Continuous Current: 60A”, “Peak Current: 100A”, “Battery Strings: 03-17S”.
- JK_B2A20S20P-H-C: Active Balance BMS; Active Balance Current: 2A; Adapt Battery Strings: 10S-20S (LTO), 7S-20S (Li-ion), 8S-20S (Lifepo4); Continuous Discharge/Charge Current: 200A; Support Batteries Heating Function / Built-in heating chip; Support RS485 Function Default / Built-in CANBUS Chip.
Details
A layered internal view highlights the control board, connectors, and enclosure layout used in the JIKONG JKBMS design.
Ports are laid out for RS485 by default, with connector positions marked for CANBUS, LCD, and heating options.
Bluetooth monitoring in the mobile app provides live pack data plus individual cell voltage and status readings.
Device scanning, configuration menus, and detailed cell measurements are available from the Android/iOS app.
Smart working modes help manage power use during storage, long idle periods, and normal operation.
A quick spec table compares supported cell counts, balancing approach, current ratings, and available interfaces across models.
