In general, lithium-ion battery consists of three parts: lithium-ion protection circuit (PCM), the shell or shell plastic
1. Battery Category
Lithium-ion VGP-BPS10 battery and a cell phone to the situation, generally divided into an external battery and built-in battery, to name a very easy to understand, external battery that is directly installed in the backs of hands, for example: 191 MOTOROLA, SAMSUNG series, etc.; High battery is charging cell phones, but another shell, one in the loop when cell phone batteries, such as: 998.8088 MOTOROLA, NOKIA most models
1. External Battery
External battery pack in the form of ultrasonic welding and loop two kinds:
1.1 Ultrasonic Welding
Shell
Such packages are below the battery casing points, ABS + PC hardware is generally expected, the shell surface treatment injection, in general, the model names: 191 MOTOROLA, SAMSUNG series, the original battery cover long-term use after treatment with injection does not normally wear flowers, and some brands to spend a few days the Dell Inspiron 1300 battery cell or parallel shells began to fall off the fuel injection. The reasons are: the shell of batteries for mobile phones are cheaper, the cost of treatment is usually injected shell several times (good), so that the processing involves three steps: Spray Varnish (land), injection (the formation of color), then light oil spray (the order should be, if I remember correctly), while some manufacturers to reduce the cost of disposing of the proceedings at first and third work order the cost is very low.
The ultrasonic welding presses
His role as follows:
The best of the industry should be made presses ultrasonic welding of the letter Electric Co., Ltd., Shenzhen, Kuwait product.
Welding
With good presses ultrasonic welding does not OK if the weld with the equipment and presses Shell welding setup has a lot to the outer shell is made primarily with manufacturers of relevant equipment to nozzle doping situation, while parameter configuration must find their own way for the company because it involves a number of F4486B technical, unable to say more.
1.2 cards Button
The principle of snap-in design of stacks of the lower crust to form the snap-in, which is usually only once, if the card is getting better off the user opened strong, then it can not recover, but it is not important for the manufacturer in terms of difficulty (good map then folded open), and its representative models: Ericsson 788, Motorola V66.
2. Built-in battery
Built-in battery, there are two forms of sealing, ultrasonic welding and packages marked (using the brand will be the battery all packed)
Ultrasonic welding of the battery are mainly: NOKIA 8210,8250,8310,7210 and so on.
The subject of the VGP-BPS9 battery a lot, like the previous two years was MOTO998 Hu, 8088 by.
2. Lithium-ion battery circuit protection (PCM)
Section II of lithium-ion batteries by the knowledge that we can see that the lithium-ion batteries need at least triple the protection —– Over-load protection, over-discharge protection, protection short-circuit, then they should generated a circuit protection, the protection requirements of circuit protection for these three objectives:
Protection against overload: Protection against overload principle IC as follows: When an external charger for lithium battery, when, to avoid a temperature rise caused by increased internal pressure must terminate the charge state. At this stage, the need to test the battery voltage to protect IC when the time comes to 4.25V (assuming that the point of overcharging 4.25V) or start on the protection of burden would cut the MOS power since the opening, closing and the load.
Over-discharge protection: over-protection principle of the landfill IC: To prevent over-lithium batteries discharge, lithium batteries connected to the case load, when the battery voltage is lower lithium the more-developed discharge voltage detection (assumed to be 2.5V) will start over-discharge protection, power MOSFET to cut the discharge passage of the open-ended to avoid battery-phenomenon discharge, and keep the battery low quiescent current in standby mode, currently only 0.1U. When the lithium battery is connected to the charger and the battery voltage lithium is greater than this period of excessive discharge voltage, over-discharge protection is lifted. In addition, taking into account the conditions of discharge pulse, excessive discharge detection circuit with time delay to prevent malfunction.
Over discharge protection and support to protect the IC main manufacturers are: Mitsumi (MITSUMI), Seiko, Taiwan Fu Jing (DW01, FS301, 302), Ricoh, Motorola, packaging, etc. mainly for SOT26, SOT6
Overcurrent and short-circuit current
For unknown reasons (discharge or negative by metallic objects inadvertently) caused by over-current circuit or short, to ensure security, you should immediately cease its discharge. Terms runway Principles of protection against overcurrent IC, when the discharge current is too large or too short occurs, the protection of integrated circuits should start (short circuit) the current protection, over current detection at this time is power MOSFET’s Rds (on) as a sensor monitoring the impedance voltage drop in the case, if the ratio set by the A1060 voltage-current detection is higher when the discharge stopped, the formula is:
V = I × Rds (on) × 2 (V-for over-current detection voltage, I the discharge current).
Suppose V = 0.2V, Rds () = 25mΩ, and protect the current size of I = 4A on.
Similarly, too much time current detection delay should also be provided to prevent current flow generated when there are unexpected failures.
Usually, after the election of overheating if they can remove the excess current factors (such as the charge immediately and out) will resume its normal state, may proceed with the normal load, the discharge action.