21700 5500mAh リチウムイオン電池セル: 主な仕様とバッテリーパックの用途
As demand for high-capacity rechargeable batteries continues to grow, 21700 cylindrical lithium-ion cells are becoming an important option for professional battery pack manufacturers and energy solution providers.
For companies developing lithium-ion battery packs, selecting the right cell involves more than comparing capacity. 電圧, 放電能力, 内部インピーダンス, 寸法, operating temperature and battery management requirements all influence the final system performance.
あ 21700 lithium-ion cell with a minimum standard discharge capacity of 5500mAh and a nominal voltage of 3.636V offers a high-capacity specification for compatible battery pack engineering projects.
この記事では, we explore its key technical specifications, performance characteristics, design considerations and potential applications.
1. とは何ですか 21700 Lithium-Ion Battery Cell?
あ 21700 battery cell is a cylindrical rechargeable lithium-ion cell with a nominal form factor of approximately 21mm in diameter and 70mm in height.
Compared with smaller cylindrical formats, の 21700 design provides more internal volume for active materials, making it suitable for battery designs that require a combination of capacity and compact cylindrical packaging.
電池パックメーカー様向け, 21700 cells can be arranged in series and parallel configurations to achieve the required voltage and capacity.
The final configuration depends on the electrical requirements, available installation space, thermal design and battery management system.
2. Key Specifications of a 21700 5500mAh Battery Cell
Understanding the technical parameters is essential when evaluating a lithium-ion cell for a new battery project.
The following specifications provide a reference for battery pack engineering.
| Technical Parameter | 仕様 |
|---|---|
| セルのフォーマット | 21700 円筒形 |
| バッテリーの化学 | リチウムイオン |
| 公称電圧 | 3.636V |
| 標準吐出量 | 分. 5500mAh |
| 充電電圧 | 4.2V |
| 充電方法 | CC-CV |
| 標準充電電流 | 0.2C |
| 最大充電電流 | 1C |
| Maximum Continuous Discharge Rate | 2C |
| Maximum Non-continuous Discharge Rate | 3C |
| 放電終止電圧 | 2.50V |
| Initial AC Impedance | マックス. 15mΩ |
| 最大セル重量 | 74g |
| 最大直径 | 21.78mm |
| 最大高さ | 71.00mm |
| 充電温度 | 0℃～45℃ |
| 放電温度 | -20℃～60℃ |
These values should be evaluated under their specified test conditions. Actual battery pack performance depends on the complete system design and operating environment.
3. High Capacity for Battery Pack Development
Capacity is one of the most important factors when selecting lithium-ion cells.
With a minimum standard discharge capacity of 5500mAh, ある 21700 cell can provide a high-capacity option for compatible battery pack configurations.
例えば, connecting cells in parallel increases the overall capacity, while connecting cells in series increases the pack voltage.
しかし, the final configuration must be determined by qualified battery engineers according to the required voltage, 容量, 現在, protection strategy and thermal characteristics.
Choosing a suitable cell configuration helps manufacturers develop battery packs that meet their specific project requirements.
4. Understanding Continuous and Non-continuous Discharge
Discharge capability is another important parameter for battery pack applications.
The cell specification defines:
- Maximum continuous discharge rate: 2C
- Maximum non-continuous discharge rate: 3C
These two values should not be confused.
Continuous discharge refers to current that can be maintained under the specified operating conditions. Non-continuous discharge refers to a higher current capability that is not intended to be maintained continuously.
バッテリーパックプロジェクトの場合, engineers should evaluate the actual operating current, peak current duration, temperature rise and protection settings.
A suitable BMS and thermal management design are essential for safe and reliable battery operation.
5. Charging Method and Operating Temperature
The cell uses a constant-current and constant-voltage charging method, commonly known as CC-CV.
During the charging process, the charger first supplies a controlled constant current. When the cell reaches the specified charging voltage, the charger maintains constant voltage while the charging current gradually decreases.
The specified charging voltage is 4.2V.
The operating temperature ranges are:
- 充電: 0℃～45℃
- 放電中: -20℃～60℃
Battery pack designers must consider temperature monitoring, charging control and over-temperature protection when developing the complete system.
Using an appropriate charger and battery management system helps ensure that the cell operates within its specified limits.
6. Why Internal Impedance Matters
Internal impedance influences voltage drop and heat generation when a battery cell delivers current.
The initial AC impedance of this cell is specified at a maximum of 15mΩ under the test conditions described in the specification.
When evaluating cells for battery pack production, manufacturers should consider:
- Initial impedance consistency
- セル電圧の一貫性
- 容量の一貫性
- Temperature rise under load
- Batch-to-batch quality control
For multi-cell battery packs, cell matching and consistent assembly processes are important parts of overall system design.
7. Potential Applications of 21700 Lithium-Ion Cells
の 21700 cylindrical format can be evaluated for a range of battery pack projects, depending on the electrical requirements and approved end-use applications.
Potential areas for technical evaluation include:
Portable Energy Storage
Portable energy storage products require appropriate cell configurations, charging systems and protection circuits. Battery pack engineers must evaluate the required capacity, output power and operating conditions.
Electric Mobility Battery Packs
Electric mobility battery projects require careful consideration of continuous current, peak current, vibration resistance, thermal management and battery protection.
Cell suitability must be confirmed against the specific vehicle and pack requirements.
Industrial Battery Systems
Industrial battery systems may require customized voltage, capacity and discharge configurations. The cell can be evaluated as part of a professionally engineered battery pack.
Robotics and Automated Equipment
Battery-powered robotics and automated equipment require suitable battery capacity, stable output and reliable protection systems. Engineers should verify operating current, duty cycle and thermal requirements before selecting a cell.
8. Important Considerations Before Selecting a 21700 細胞
Before purchasing lithium-ion cells for a battery pack project, professional buyers should evaluate several factors.
1. Electrical Compatibility
Confirm that the nominal voltage, charging voltage, discharge current and capacity match the intended battery system.
2. Mechanical Compatibility
Check cell dimensions, holder design, insulation and available installation space.
3. Thermal Management
発熱を評価する, セル間隔, cooling conditions and temperature monitoring.
4. バッテリー管理システム
The BMS should provide appropriate overcharge, 過放電, overcurrent and temperature protection.
5. Cell Consistency
For mass production, assess capacity matching, 電圧の一貫性, impedance consistency and incoming inspection procedures.
6. サプライヤーの文書
Request the applicable formal product specification, トレーサビリティ情報, transport documentation and any relevant test reports or certifications.
9. Working with a Professional Battery Pack Supplier
Selecting the right battery cell is only one part of developing a reliable battery solution.
Battery pack manufacturers and system integrators also need to consider cell configuration, 電気接続, BMSの選択, 筐体設計, thermal management and application-specific testing.
YIFANG focuses on lithium battery cells, battery packs and energy storage solutions, supporting B2B customers with product evaluation, technical communication and battery pack OEM/ODM project discussions.
When evaluating a battery cell for your project, providing detailed requirements helps suppliers understand your application and assess technical compatibility.
10. Request a Battery Cell or Battery Pack Quotation
Are you sourcing 21700 lithium-ion cells for a battery pack manufacturing project?
Contact YIFANG and share the following information:
- 対象用途
- Required battery cell quantity
- Target battery pack voltage
- Required battery capacity
- Continuous and peak discharge current
- Battery pack dimensions
- Project development stage
- 目的地の国
- OEM/ODM requirements
Our team can discuss your project requirements and help evaluate suitable battery solutions.
YIFANG – Your Partner for Lithium Battery Cells and Battery Pack Solutions.