Fuel Cell Voltage Monitor CVM KPJ07 Series 220 Channels 0.5% Accuracy IP67 Protection

Fuel Cell Dedicated CVM Cell Voltage Inspection Controller KPJ07 Series 220 Channels 0.5% Sampling Accuracy Cascade Expandable to 330 Cells Automotive Grade Design

Quick Detail:

• Cell voltage inspection controller (CVM) developed specifically for proton exchange membrane fuel cell (PEMFC) systems
• Core function: real-time acquisition of each cell voltage inside the stack, diagnosis of voltage abnormality and disconnection faults, providing stack health status data for the FCU
• Measurement channels: 220 channels (supporting cascade expansion to 330 cell voltage measurements)
• Measurement range: -3V ~ +3V (supporting full-channel negative voltage measurement)
• Resolution: 1mV
• Measurement accuracy: 0.5% + 10mV
• Voltage mis-connection protection: +/-27V
• Communication interface: CAN2.0B (2 CAN channels: CAN0 output / CAN1 diagnosis)
• Data update period: 120ms
• Supply voltage: 9~32V (compatible with 12V/24V systems)
• Power consumption: <9W
• Working temperature: -40C ~ +105C
• Protection class: IP67
• Functional safety: ASIL D/ASIL B level
• Dimensions: 337x146x32mm
• Installation: fixed with 4 M5 bolts

Description:

A fuel cell stack is composed of hundreds of cells connected in series, and the performance of each cell directly affects the overall stack output. If a cell has an abnormal voltage (such as too low a voltage, reverse polarity or disconnection), it will cause the stack performance to decline or even irreversible damage. The CVM (Cell Voltage Monitor) is precisely the core electronic control component that monitors each cell voltage in real time and ensures safe stack operation.

The KPJ07 series cell voltage inspection controller for fuel cell systems is a high common-mode voltage cumulative differential input voltage measurement module, suitable for differential voltage measurement of high-voltage, potential-cumulative systems, and especially suitable for fuel cell cell inspection voltage measurement. The product uses an automotive microprocessor for calculation and includes 220 high-voltage isolation channels, able to provide accurate voltage measurement data.

High performance:

• 2mV precision cell voltage measurement, 0.5%+10mV measurement accuracy
• +/-4V cell voltage measurement range (supporting -3V~+3V), supporting full-channel negative voltage measurement
• 36~330 cells voltage measurement and supporting cascade expansion
• 30ms/90ms cell polling measurement period, data update period 120ms
• 0.1% accuracy stack total current measurement

High reliability:

• ASIL D/ASIL B level functional safety
• Hardware redundancy design for key functions
• High EMC performance, wide temperature environment adaptability (-40C~+105C)
• IP67/IP68 level waterproof design
• 10kPa~200kPa air pressure adaptability

Distinctive features:

• Open graphical programming, flexible stack matching and calibration
• Up to 2GB automotive-grade large-capacity storage, supporting custom historical fault record storage and playback
• Supports 20Hz~1kHz current perturbation internal resistance measurement
• Supports reverse-order sampling line connection, optimizing the harness layout inside the stack

Key functions:

• Voltage measurement: acquires each cell voltage in real time, actively uploads key information via the CAN bus at a 30ms period; cell voltage and diagnosis information are uploaded in an extraction-frame triggered manner
• Fault diagnosis: can diagnose each cell voltage fault (E001~E220) and disconnection faults, reported via the CAN bus (ID 0x314~0x317)
• Hardware interlock: has one hardware interlock detection function, detecting the connection status of the fuel cell stack main current output connector
• Status monitoring: real-time monitoring of controller temperature (CVM_Temp), life (Life), voltage range (VoltageRange) and communication status (CVMStatus)

Specifications:

Electrical / Optical Characteristics (Ta=25C +/-3C). See product specification image.

Applications:

This product is widely used in the stack cell voltage monitoring of various proton exchange membrane fuel cell (PEMFC) systems, specifically including:

• Hydrogen fuel commercial vehicles (heavy trucks, city buses, logistics vehicles) - stack voltage inspection
• Hydrogen fuel passenger vehicles (sedans, SUVs) - stack voltage inspection
• Stationary fuel cell power stations (backup power, distributed energy systems) - stack voltage inspection
• Fuel cell energy storage systems - battery pack voltage monitoring
• Fuel cell test benches - R&D test data acquisition

Typical application position: installed inside or near the stack; connected to the voltage sampling lines of each cell of the stack through JST eZRO series connectors (P1~P5), and communicates with the FCU via the CAN bus to upload voltage data and diagnosis information. It supports reverse-order sampling line connection, facilitating the optimization of the harness layout inside the stack.

Company Advantages:

Shanghai Yibaijia Hydrogen Energy Technology Co., Ltd., as a professional hydrogen energy parts supply platform, distributes the KPJ07 series cell voltage inspection controllers (CVM) dedicated to fuel cells. The KPJ07 series CVM has 220 measurement channels, 1mV resolution, 0.5%+10mV accuracy, CAN2.0B communication and IP67 protection class, supports cascade expansion to 330 cells, and meets ASIL D/ASIL B functional safety requirements. The Shanghai Yibaijia team has more than 10 years of hydrogen energy industry experience and can provide full-process technical support from product selection and system matching to installation and commissioning.

FAQ

Q1: Can you provide samples for testing?
A: Yes, we support sample orders for vehicle installation testing and performance verification, and also accept mixed-model sample orders.

Q2: What is the delivery lead time?
A: Sample orders usually take 5-7 working days; bulk orders (depending on order quantity) generally take 15-30 working days.

Q3: Is there a minimum order quantity (MOQ) limit?
A: There is no strict MOQ limit; 5-piece sample trial orders are supported, and bulk order prices are more favorable.

Q4: What role does the CVM (voltage inspection controller) play in a fuel cell system?
A: The CVM acquires the voltage of each cell inside the stack in real time, diagnoses voltage abnormalities (such as too low a voltage or reverse polarity) and disconnection faults, and provides stack health status data for the FCU. If a cell is abnormal, the CVM can report it in time to prevent stack damage.

Q5: How many measurement channels does the KPJ07 series CVM have?
A: The KPJ07 series provides 220 cell voltage measurement channels, supporting cascade expansion to 330 cells.

Q6: What are the voltage measurement range and accuracy of the KPJ07?
A: Measurement range -3V ~ +3V (supporting full-channel negative voltage measurement), resolution 1mV, measurement accuracy 0.5% + 10mV.

Q7: What is the voltage mis-connection protection capability of the KPJ07?
A: The voltage mis-connection protection capability is +/-27V. Special treatment is applied to the channels crossing connectors, allowing the input voltage to increase to 87V; short-time mis-insertion of adjacent connectors when the average cell voltage is below 1.8V will not damage the controller hardware.

Q8: What communication interface does the KPJ07 use?
A: It uses CAN2.0B communication, providing 2 CAN interfaces - CAN0 for data output (uploading voltage/diagnosis information) and CAN1 for internal diagnosis and program flashing. CAN0 termination resistance 120 Ohm, CAN1 termination resistance 60 Ohm.

Q9: How is the KPJ07 installed?
A: The KPJ07 has 4 mechanical fixing positions; it is recommended to use 4 M5 bolts for installation. The installation position needs to consider stack heat generation, avoiding locations where the temperature is above 95C for a long time. Maintenance convenience must also be considered, ensuring the controller can be removed without opening the stack main body sealing surface.

Q10: How to handle product failures?
A: We implement a strict quality control system, with an out-of-factory defect rate below 0.2%. During the warranty period, small batches of defective products will be replaced with new ones in the next order; batch quality problems will be negotiated for repair or replacement to ensure customer rights.