Highly integrated single-chip Li-ion battery protection solution
Posted By admin on February 3, 2010
When this request increasingly extensive lithium batteries from mobile phones, MP3, MP4, GPS, toys and other portable devices, the need for Sony VGP-BPS2B Sony VGP-BPS2C data preservation, natural gas, its market capacity has reached hundreds of millions per month. To prevent batteries lithium excessive pricing, excessive discharge, over current and other abnormal conditions affecting the life of the battery, usually through the protective device of the lithium battery to prevent the abnormal state of cell damage.
Lithium battery protection device schema in Figure 1 is mainly controlled by the battery protection IC, and external, M1 and M2 discharge switch load switch to achieve. When the P + / P-side connection charger, charging the battery normally, M1, M2 are in a state of conduction when the charge control IC detects abnormalities, it will terminate the charge off M2. When the P + / P-side connection load, the normal battery discharge, M1, M2 are conduction; When the control IC to detect abnormal discharge, it will terminate the M1 output levels off.
Several existing lithium-protection program
2 is based on the above battery lithium to protect the principle of a common council of the lithium battery protection. Included in the SOT23-6L package, the control IC, SOP8 package is a two switch M1, M2. While control of the manufacturing process of ICs and switching manufacturing processes differ, Figure 2, two chips are manufactured in a different process, usually the two chips are chips from different vendors. Inspiron 1520 battery Inspiron 1521 battery
In recent years, the industry, there will be a set of little chips together to improve integration, reduce the size of the trend in the final program. Market lithium protection is no exception. Figure 3 The two types of lithium battery protection scheme A & B appears in Figure 2 in the two chips in one chip, but in fact its packaging in the controller and the chip switch IC is still separated from different suppliers, the program is simply combined the two letters together, commonly called “core-2-one.”
Due to internal two chips from different vendors is still very real, the form is not enough, leading to the final packaging, various forms and in many cases can not adopt a common set. The relatively large size of the package, but we can not save external components, thus “two cores in a single program, in fact, not much room for the provinces. In terms of cost, although the cost of two packets in a series of measures to reduce costs, but because of this package is usually relatively large, and some is not a common package, and some in order to reduce the size of the package should form stacking boxes and therefore the traditional two programs smart relative to its cost advantage is not obvious. Vostro 1500 battery Vostro 1700 battery
4 is a real bullet and switch the controller chip on the same wafer of single-chip solution. Diagram of a traditional program in the switch is an N-type tube, then in Figure 1, B and P in-between, commonly called “negative protection. Figure 4 in the program because of technical reasons, the switch can be replaced by P-type tube connected between B + and P +, commonly called cathodic protection. Use this chip after the completion of this program to protect the tips in the detection of the user must be replaced when the shield of the test material and ideas. This program, while a certain amount of packaging to reduce costs, but the cost of chips has been reduced, with the vast amount of competition both in the traditional program has no real cost advantage. Unlike traditional programs have become incompatible with the concept of positive protection enormous obstacles in their commercialization process. TD347 C1295
The “more than two nuclei in a” program, one program of the anode chip protection while in the program area and the cost to the user brings some advantages, but the benefit is not yet clear . These programs have also made a number of drawbacks, and the program’s traditional customers competitive and mature in the process ultimately can only reduce the space margin to price competition. Because the cost true origin of these programs, and there is no obvious advantage, therefore, with the traditional program, and passing control IC chip price cuts, these “core-2-one” option or the protection program positively and had not been able to shake the traditional program of market dominance status. hp Pavilion DV1000 battery hp Pavilion dv4000 battery
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