In recent years, underwater sports have turned into a popular lifestyle.
Some popular underwater sports products come out such as underwater drones, electric surfboards, jet skis, electric swimming rings, electric remote, control lifebuoys, etc which match with a powerful battery system. Not only the battery should be with strong life cycles but also need one accurate SOC power metering function.
The whole battery should have waterproof IP68 in 50m-100m.In addition, one stable and reliable communication protocol (UART/RS485/Canbus) is required to be connected to the host to ensure personal safety and equipment reliability.
The design idea of our underwater battery is the inheritance of the long-term historical experience of the design and production for plenty of industries that require the best battery construction, safety and reliability, and extremely waterproof function.
The development and testing process of our surfboard battery pack is as below:
BMS design solution:
UART communication
-The intelligent balance process of the cells and the balance voltage can be flexibly adjusted by the upper computer
-TI(Texas Instruments, USA) front-end detection chip
-Temperature protects when the battery pack is charging and discharging
-NTC detects the temperature and the detection value is accurate
-All protection delays are programmable
-Overcharge, over-discharge, over current, short circuit, over-temperature, low temperature, and other protection functions.
-Max continuous discharge current up 100A,instant 170A(10S)
-20A charge current
-High-precision detection of voltage and current
-Abnormal data storage, intelligent voltage alarm, which supports after-sales service
-Accurately report the current battery information, record the charge and discharge cycle of the battery pack, record the usage situation, and provide the basis for after-sales
-Multiple operating modes for flexible control of quiescent current consumption
One case of our battery pack solution: 12S14P
The accessory-LED display solution:
| 电源开关与电量显示复合使用;关机状态下，单次短按1秒显示电量。The switch is combined with the power display; In the off state, the led display work by pressing for 1 second. |
| 关机状态，长按3秒开机状态，电量显示的LED灯是长亮的。In the off state, press for 2 seconds to turn on, and the LED indicator stays work. |
| 开机状态，长按4秒关机In the on state, press for 4 seconds to turn off. |
| 关机是将BMS供电切断，如果开机后，在没有负载1h后，会自动关机。Turn off, The BMS does not supply the power, If it is turned on, it will be automatically shut down after 1h of no load. |
| 通过充放电，同时通过BMS记录SOC数据，最终放电电时可通过放电数据及BMS记录的SOC数据确认BMS SOC计算是否准确。最终有数据报告。By charging and discharging, the SOC data is recorded by the BMS at the same time, and the final discharge electric power can confirm whether the BMS SOC calculation is accurate by the discharge data and the SOC data |
见图示，5个LED采用BMS直接驱动的方式。 |
The BMS Specification:
How to test the battery pack’s waterproof function?
We can the testing equipment for waterproof testing.
| 设置参数 Data Setting | |
| 压力控制方式 Pressure control method | 自动调节 Automatic adjustment |
| 压力误差值Pressure error value | ±0.002 Mpa |
| 传感器显示精度Sensor display accuracy | 0.001Mpa |
| 试验水深Test water depth | 2m/5m |
| 压力设置 Pressure setting | 0.02Mpa |
| 安全阀排气压力 Safety valve discharge pressure | 0.55Mpa |
| 测试时间设定 Test time setting | 360 min/120 min |
Test data underwater:
| Series NO. | Testing content | Test water depth | Test time | Test result | Remark |
| 1 | 43.2V35Ah | 2 meters | 360minutes | PASS | |
| 2 | 43.2V 35Ah | 5 meters | 180 minutes | PASS |
Underwater testing data:
The following are the test results which include information about Series No., Testing Content, Water Depth of Testing, and Testing Time.
1 43.2V35Ah 2 meters 360minutes PASS
2 43.2V 35Ah 5 meters 180 minutes PASS
In terms of waterproof battery pack solution， special attention should be paid to the following tips:
- Choose the suitable waterproof glue
- A professional waterproof design like perfect housing construction, LED display materials
- The connector should be IP68 grade and the connector support A discharge current
- BMS design, and choose the competitive cells for the battery pack solution
- Control the production with a good figure
- Use the equipment to test the battery pack
We have gained rich experience from testing, research, and development. If you are looking for a custom battery pack solution, feel free to contact us!
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