Vishvatronics Urja Private Limited

IR tester specifications for lithium cells
IR testers, also known as battery internal resistance testers, are crucial for evaluating the performance and health of lithium-ion cells. Here's a breakdown of common specifications and factors to consider:
1. Measurement method
AC 4-terminal method: This is the most common and accurate method for measuring low internal resistance values (e.g., milli-ohms or micro-ohms) typically found in lithium cells. This method uses a constant-current AC signal, usually at 1 kHz frequency, to minimize the effects of contact and wiring resistance.
DC method (DC-IR): This involves applying a large DC current pulse and measuring the instantaneous voltage drop. While simpler, it's generally less accurate for low resistance values and more suitable for larger capacity batteries.
2. Measurement parameters
AC resistance (AC-IR): Measures the battery's impedance at a specific frequency, which at 1 kHz approximates the internal resistance.
DC voltage (OCV): Measures the open-circuit voltage of the battery, which is another crucial indicator of its state of charge and overall health.
3. Measurement range and resolution
Resistance: Look for a broad measurement range, typically starting from micro-ohms to ohms, and high resolution to accurately capture the low internal resistance values characteristic of lithium cells (especially those used in high-power applications like electric vehicles).
Voltage: The voltage range and resolution should be compatible with the specific lithium cell or battery pack you intend to test.
4. Accuracy
High accuracy is essential for reliable IR testing. Look for testers with accuracy ratings within ±0.5% or better for both resistance and voltage measurements.
5. Test speed
Testing speed can range from milliseconds to a few seconds per measurement.
6. Features and considerations
4-Terminal Measurement: Essential for minimizing contact and lead resistance, improving accuracy for low resistance measurements.
Noise Resistance: Crucial for accurate measurements in potentially noisy environments.
Programmable Testing: Allows for customizable test profiles for various battery types and testing scenarios, including cycling, aging, and performance evaluation.
Data Logging and Export: Enables saving, tracking, and analyzing test data over time for trend analysis and report generation.
Safety Features: Look for features like anti-reverse connection protection, over-voltage safeguards, and thermal management to ensure safe operation during testing.
Compatibility: Ensure the tester is compatible with the specific type of lithium cells you are testing (e.g., cylindrical, pouch, prismatic) and their respective chemistries (e.g., LiFePO4, NMC, LFP).
Connectivity: USB or Bluetooth connectivity for data transfer and control with a computer or other smart devices.
In addition, some advanced testers offer features like:
Cole-Cole plot measurement: Provides a detailed analysis of the different resistance components (ohmic, reaction, diffusional) within the battery by varying the measurement frequency.
ESR measurement for capacitors: Some battery testers can also measure the equivalent series resistance (ESR) of capacitors, useful for testing lithium-ion capacitors (LICs) and electric double-layer capacitors (EDLCs).
Ultimately, the best IR tester for you will depend on your specific needs and application. Whether you need a simple tool for quick quality checks or a comprehensive system for in-depth research and development, ensure the chosen tester meets your required accuracy, measurement range, and features while also prioritizing safety.

1 x 2 Battery Cell Holder is a compact and durable holder designed to securely accommodate two battery cells arranged in a single row. Commonly used for AA, AAA, or similar cylindrical cells, this holder ensures stable electrical contact and easy battery replacement. Made from sturdy plastic with metal terminals, it prevents battery movement and short circuits. Ideal for DIY electronics, portable devices, and prototype projects, the holder provides reliable power connectivity while simplifying battery management. Its lightweight and compact design make it suitable for various applications requiring a simple battery mounting solution.

1 x 3 Battery Cell Holder is a sturdy and compact holder designed to securely hold three battery cells arranged in a single row. Typically used for AA, AAA, or similar cylindrical batteries, it provides reliable electrical contact through integrated metal terminals while preventing battery movement or disconnection. Made from durable plastic, this holder ensures safe and easy battery installation and replacement. Ideal for DIY electronics, portable devices, toys, and prototype projects, it offers a convenient way to manage multiple batteries in a compact space, ensuring consistent power supply for your devices.

1 x 1 Inch Battery Cell Holder is a compact and durable holder designed to securely hold a single battery cell with a 1-inch diameter or length, commonly used for cylindrical or coin cells. Made from sturdy plastic with metal contacts, it ensures stable electrical connection and easy battery insertion or replacement. Ideal for small electronic devices, DIY projects, and prototypes, this holder prevents battery movement and short circuits while providing reliable power connectivity. Its simple design and robust construction make it perfect for applications requiring a secure and accessible battery mounting solution.

A 9x10 battery cell holder is a plastic spacer designed to securely hold 90 cylindrical cells in a 9-row by 10-column arrangement. These holders are commonly used in DIY battery packs for applications such as electric vehicles (EVs), solar storage systems, and other high-capacity energy storage solutions.

Mini IR Tester Machine
The Mini IR Tester Machine is a compact and portable device designed to quickly test infrared (IR) signals from remote controls and IR-based systems. Ideal for technicians and electronics hobbyists, it provides instant feedback through LED indicators or digital readouts, ensuring fast diagnostics and troubleshooting of IR emitters.

The SB50 connector, often referred to as an Anderson SB50 connector, is a 50-amp, 600-volt power connector designed for various applications requiring high current connections. It's known for its cost-effectiveness, design flexibility, and safety features, including mechanical keys to prevent cross-mating and color-coded housings for voltage identification.
Here's a more detailed breakdown:
Key Specifications:
Current Rating: 50 Amps (UL rated for up to 120 amps with specific contact configurations)
Voltage Rating: 600 Volts (AC or DC)
Wire Gauge: Accommodates wire sizes from #16 AWG (1.3 mm²) to #6 AWG (13.3 mm²)
Operating Temperature: -20C to 105C [-20C to 105C]
Contact Material: Typically silver-plated copper for low resistance and durability
Housing Material: Polycarbonate (PC)
Keying and Color Coding: Prevents accidental cross-mating of connectors with different voltage ratings
Features and Benefits:
Genderless Design:
The connectors can mate with each other when flipped 180 degrees, simplifying inventory and reducing assembly complexity.
Hot Plugging:
UL rated for hot plugging up to 50 Amps, making it suitable for battery and other applications where interrupting circuits is necessary.
Durability:
Designed for rugged use with features like stainless steel springs to hold contacts in place.
Versatile Mounting:
Available in various mounting options, including wire, PCB, and busbar contacts.
Wide Range of Applications:
Commonly used in battery chargers, solar panels, wind generators, electric vehicles, and other high-power applications.
Additional Information:
The SB50 is part of the larger SB connector series, which includes SB120, SB175, and SB350 connectors for even higher current applications.
Different colored housings (e.g., grey, red) are used to visually identify voltage levels, enhancing safety.
The connectors can be purchased as sets (male and female housings with contacts) or as individual components.