一、Background of the case
Surveying and mapping is a long history and very important discipline developed from human production practice, is the basis of national economic development, and is widely used in land, planning, municipalities, construction, geology, geology, highways, railways, oceans, water, military and many other areas. The development of surveying and mapping technology is based on the development of surveying and mapping instruments, especially the modern surveying and mapping technology, which relies on advanced surveying and mapping instruments to a great extent. With the improvement of the economic level and the development of science and technology, China’s electronics industry has been greatly developed, but also to promote the development and application of electronic measuring instruments, electronic measuring instruments occupy an increasingly important position in the electronics industry. A company in June 2019 asked our company to assist in the development of a mapping instrument battery pack, the project is a set of communication, software protection intelligent battery pack; the project has now been delivered in bulk.
二、Product functions and main features
1. The product has the function of over-charge, over-discharge, over-current, short-circuit, over-temperature and data reading.
2. Charge display
3. SMBus communication interface
4. Adjustable parameter settings
5. Short circuit protection function
6. Integrated IC
7. Low-power, isolated power supply circuit
8. Battery status information reading
三、Introduction to the overall programme
1.Battery parameters: using a brand imported 18650/3200mAh/3.6V battery pack
2.Finished product specifications：18650-2S2P-7.2V-6.4Ah。
3.Protection board: the parameters and schematic diagram of the smart protection board (SMBus interface communication) are as follows.
4.Assembly process: using 18650-2S2P field structure, reasonable use of space.
Protection parameters：
| No | Item | Condition | Specification |
| 1 | 过充电 Overcharge |
保护电压/Detection voltage | 4.28±0.08V |
| 2 | 保护延迟时间/ Detection delay time | 3.0±0.5S | |
| 3 | 过充恢复 Over charge recovery |
过充恢复电压 Over charge recovery voltage |
4.10±0.1V |
| 4 | 过放电 Over discharge |
保护电压/Detection voltage | 2.75±0.1V |
| 5 | 保护延迟时间/ Detection delay time | 3.0±0.5S | |
| 6 | 充电过流 Over charge current |
充电过流保护电流 Detection Over charge current |
4.0±0.5A |
| 7 | 充电过流保护延时 charge Over current detection delay time |
3.0±1S | |
| 8 | 放电过流 Over discharge current |
放电过流保护电流 Detection Over discharge current |
5.0±0.5A |
| 9 | 放电过流保护延时 Discharge Over current detection delay time |
2.0±1S | |
| 10 | 过放恢复 Over discharge recovery |
过放恢复电压 Over discharge voltage |
3.00±0.1V |
| 11 | 短路保护 | 恢复条件/Release Conditions | 断开负载/充电激活Disconnect load/charge activation |
| 12 | 充电温度保护 Overtemperature in Charge Protection |
充电高温保护 Overtemperature |
65±2℃ ，delay 3S |
| 解除温度 Overtemperature release |
45℃±5℃，delay 3S | ||
| 充电低温保护 Undertemperature |
-5±2℃，delay 5S | ||
| 解除温度 Overtemperature release |
0±5℃，delay 5S | ||
| 13 | 放电温度保护 Overtemperature in Discharge Protection |
放电高温保护 Overtemperature |
65±3℃ ，delay 3S |
| 解除温度 Overtemperature release |
55℃±5℃，delay5S | ||
| 放电低温保护 Undertemperature |
-40±5℃，delay 5S | ||
| 解除温度 Overtemperature release |
-35±5℃，delay 5S | ||
| 14 | 建议工作条件 Suggest working conditions |
建议工作温度/suggest working temperature | -20℃～+60℃ |
| 15 | 内阻/IR resistance | PCM内阻/ IR of PCM | ≤50.00 mΩ |
Schematic：
四、产品BOM
| NO | Item | Criteria |
| 1 | Semi-manufactured cell | 18650 3200mAh |
| 2 | PCM | TOPAK-929/C1340/BQ40Z50R1/ 2 strings / with LED indication / FPC |
| 3 | Shell-1 | L*W*H=70*40*34MM,epithelial |
| 4 | Shell-2 | L*W*H=70*40*7.8MM，sump |
| 5 | Key | Φ*H=9*1.4MM,Round/Keypad |
| 6 | Key pads | Φ*H=12*1.5MM,C1340/Round/Key Pad |
| 7 | support | L*W*H=66.5*10.6*6.3mm,C1340，Long stand/black |
| 8 | Label | T*W*L=0.1*29.7*47.6mm/Silver/PC surface lamination, matte finish |
五、Product size and effect display diagram
bomb map
Pictures of the finished product
Custom Mailboxes: Phyllis@topakpower.com
Tel: +86-15920229894
Whatsapp: +86-15920229894 skype:+86-15920229894
Address: 4F, No.2 Industrial Zone, Xinwei, Xinshi Community, Dalang Street, Longhua District, Shenzhen, China.
Branch address: No. 26, Yingfeng 1st Road, Dalang Town, Dongguan City, Guangdong Province (Tuopai Industrial Park)
