TWI220697B - Method for recognizing the rated capacity of lithium battery - Google Patents

Abstract

There is provided a method capable of recognizing the rated capacity of lithium battery, which performs recognition the particular relation between the rated capacity and voltage variance before and after charging based on the electrical characteristic of lithium battery. The method comprises respectively measuring the initial voltages, the voltages after charging for the same time and the stable voltages after a period of time after completing charging for plural lithium batteries with different rated capacities; and comparing the voltage variance for each battery so that the comparison standard is used as a recognition standard for recognizing the rated capacity of the type of lithium battery in the state. This method is provided with the function of rapidly and accurately recognizing the rated capacity of lithium battery. Furthermore, the method can be applied in a fast charger to recognize the rated capacity of to-be-charged battery before each time of charging, thereby determining an extremely safe and highly efficient charging process.

Description

1220697 5L, description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a method of measuring quantity, especially a method that can be made safer and more efficient with electricity [Previous Technology] As electronic products increase in number, how to make electronics With regard to batteries that have gradually become the trend of today's research and development, high-capacity, rechargeable lithium-based densities, light weight, and small volume issued by R & D projects under a development trend respond to this trend and are also most portable. Type 3C products of notebook computers, V 8 camera plasma batteries, polymer clocks into notebook computer batteries and seven new electric car collar system orders. However, ‘when the battery ’s capacity is taken into consideration, it will lead to a decrease in battery life. The trend in use, such as the popularization of electricity, therefore, it is difficult to exert its function if the amount of battery is not available.

] It can quickly and accurately identify the nominal capacity of lithium batteries used in chargers, so as to identify the nominal capacity of lithium batteries. Consumers reduce the number and type of daily life and reduce the size and portability (p 0 rtab 1 e) Obviously, the characteristics of small size and fast charging as the power supply source for electronic products are all in this standard. Therefore, the Lithium Battery opened by Sony Corporation in 1990 has high energy and fast charging. And non-pollution and other characteristics can meet the needs of today's environmental protection, and make it increasingly a source of power supply. For example, mobile phones and pen electronic products have used ordinary clock batteries (the battery) as the main power source of the product (occupies 90% The market for mobile phone batteries), meanwhile, the domain clock battery is also widely used for its power supply1, which continues to develop and rise, and its charging speed is a major bottleneck for installation, because fast charging is often used, but if the charging time is too long, it cannot meet Today ’s motive cars are too long to charge, and it ’s always difficult to take into account the improvement of charging characteristics, and then they have to use more electricity; the battery ’s charging characteristics ca n’t be grasped 1220697-^^ 11363 57 _ Revised in March of the fifth year, description of the invention (2) -------- ^ ', the main reason is that its characteristics are a non-linear change, so there is no certain formula or law to quickly find the battery Accurate Nominal Capacity (Rated CjP 1 c 11 y) value '_ Generally, the index indicates that the capacity is calculated in ampere-hour units, that is, the time it takes to continuously discharge to completion with a fixed current, for example, f = capacity 6〇 \ A milliampere-hour (mAh) lithium battery means that its battery can be continuously discharged for 30 hours at a small current of 30 amps (m A); most of the batteries used today can only detect its remaining capacity after charging ( Remaining Capaci1 ^ y), as for the total battery capacity (nominal capacity), you can only refer to the inaccurate battery surface labeling. This value is only the average value of the Weiwei battery. The error of 5%, plus the capacity of the clock system battery, tends to decrease with the increase in the number of hours of use, including its external temperature, the internal chemical or material changes, and the quality of the charger used. It can reduce its capacity, and only about 70% of the original nominal capacity is left after one year of use. Therefore, the value indicated on the surface of the battery can not accurately charge the battery capacity of the temple on the day of charging. It will cause uncertainty and danger in fast charging, because when the nominal capacity is unknown, when a 疋 current charger is facing a variety of batteries, if it is charged with a relative current greater than the actual 称 valley 1, its fast charging At this time, the internal temperature production of the battery will rise rapidly and produce a fierce electrochemical reaction. The helmet = electric energy generated at this time will reduce the efficiency of the charging process. It may also cause the charge to be quickly cut off and the battery to automatically cut off the power supply to avoid electricity. The rapid electrochemical reaction inside the core causes an explosion, which is extremely dangerous. If it is charged with a too small current, the charging time will be too long, which does not meet the development trend of fast charging. It can be seen that the nominal capacity of the battery cannot be identified. Therefore, it is difficult to balance the safety and efficiency of battery charging, and may even cause battery damage. 1220697

^^ # 36357 V. Description of the invention (3) fc Known value The charging method of Λ battery when its true nominal capacity is unknown is 1-Γ 60. Α Charging current (compared with a battery with a capacity of 600 niAh, but as previously mentioned, the capacity indicated on the surface of the battery is not # ”: Dream I,:, this charging method has been used for a long time and the capacity has decreased. The phenomenon of overcharging is also caused by overcharging. At the same time, this constant current charging is not suitable.] Once the battery of various capacities is charged, its capacity: and pre :: the value of charging C is too different. Then it is impossible to achieve a safe and effective rate. = Master = —A conventional charger uses a selection switch (JumPe: 0) to set the nominal capacity value of the battery and change it accordingly; the electrical parameters, but This method still cannot automatically measure the true capacity of the battery, ^ Many users who are not familiar with the nominal capacity are extremely inconvenient, and the sub-appliance cannot perform a high level for the battery that has been used for a long time and the nominal capacity has decreased. Efficient and safe charging. The only way to measure or identify the nominal capacity in the current practice is to use ~ small current charging and discharging methods, such as a small current of c / 1 0 ~ C / 3 Electricity or charge to a certain voltage, then A small constant current is slowly discharged to / push the total capacity charged. Take C / 3 current charge and discharge as an example. This is too light for at least 6 to 8 hours, and if the current of C / 10 is used, it will It takes more time, and this method of extremely high time cost obviously cannot be applied to the charger, because ^ you need to perform more than 6 hours of testing before charging, then the right rate is far better than directly testing without testing. Charging with low current comes fast because there is no concern about overcharging with low current charging. It can be seen that this method can not = solve the existing problems; In addition, the newly developed mobile phone battery capacity must be ▲▲, meter, and its operation is also related to The charging and discharging test principle is adopted, and the test time $ needs to be as long as 1 ~ 3 hours, which does not solve the need for fast charging; therefore, if

1220697 more: ¾-丄 ·] Erli ftlf36357 V. Description of the invention (4) How to develop a recognizable lithium-based charger to increase the recognition time of charging and cause the key issues of charging. [Summary of the Invention] Therefore, the method of the nominal capacity of the present invention; another aspect of the present invention is a battery with a nominal capacity. Another aspect of the present invention is a safe and efficient method that can be identified as the aforementioned and other pool nominal capacities. The steps between the measurement and its nominal capacity: select a plurality of devices to measure the plurality of lithium V1 separately; measure the plurality of lithium systems individually to the plurality individually as v 2; measure the voltages at the same time separately, and Let the measured voltage difference between VI, V2 and V3 be compared with the classification criterion as the discrimination criterion. Among them, the method of revising the safety of the battery ’s nominal capacity for the same nominal battery is applied to reduce the efficiency quickly, so as not to take too long. This is an urgent need in this field. The purpose is to provide a discernible lithium-based battery. The purpose is to provide a method to recognize the battery of the clock. The purpose of the present invention is to charge a certain number of lithium-based batteries to the battery of the electric clock-based battery that has different nominal series batteries according to a certain proportion of lithium-based batteries, which is V 3; divided into individual voltages. Compare and classify, identify the battery capacity of the method in this state can quickly and accurately identify a kind of battery that can provide the nominal capacity of the battery before and after the charge is designed, the capacity of the battery to be charged 'And make it a charging method for the same time; identify the voltage changes of lithium-based batteries include the following lithium-based batteries; charge the initial voltage; divide the voltage, and make the battery after the charge is completed a period after the charge is completed Calculate the value of each lithium battery separately and obtain a classification standard for different lithium batteries; and the initial capacity of the nominal capacity VI charge and measure to get more of this type of lithium-based battery in different batteries

After the completion of the group's electrical voltage change meter, the (CV) > characteristics of the invention of the cell voltage and the multi-stage voltage difference value will be measured by the method, which will charge the fast charging current to the upper stage. In order to find a more accurate method, when the lithium system has a certain voltage difference test, the electrical system is set to a certain electrical limit, and various types of battery charging can be identified according to the nominal proportional relationship value of the lithium-ion battery. cc-cv) (Return to the fixed charging method, the classification basis. (L i +) The electrical characteristics of the battery, the amount of grain and the terminal power before and after charging. 'Therefore, the nominal capacity set by the present invention can be used, and In the test parameters, input a fast charger constant current (CC), the constant voltage is first charged with the constant current, and the voltage charging method is used), and the pulse charging is no matter what method is used at this time,

Before each charge, the charger can perform a charging test on the battery to be recharged of any model and any life to identify the existing nominal capacity of the battery, and perform the safest and most efficient operation based on this capacity. At the same time, we can also design a shortest charging test time 'to minimize the test time of fast chargers to meet the needs of fast charging'. For the characteristics of lithium batteries, the test time will be 玎Reduced to less than a minute. [Embodiment]

The method for identifying the nominal capacity of the clock battery according to the present invention is based on the charging characteristics of the warp battery shown in Fig. 1. It can be seen from the figure that the terminal voltage of the iron battery will decrease slightly to z stable after a period of time when the child's electricity unit is formed. State (Steady State). There is a certain relationship between this voltage drop and the nominal capacity of the battery. This is the electrical characteristics of a lithium ion (Li +) battery. Therefore, if you can find the simplicity between the two, Relationship, that is, the nominal capacity of the battery is identified; Figure 2 is a flowchart of the method of the present invention 'It calculates the terminal voltage change before and after the lithium battery is charged # i < I y

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The established lithium battery identification criterion is used to determine the nominal capacity of the lithium battery. As shown in the figure, in step s1, the initial voltage VI of the lithium battery before charging is measured. The battery is charged for a specified period of time. This specified period of time can be determined according to the charging parameters of the recognition criterion (see Figure 3) obtained in advance. 'Step S3 measures the battery voltage yg of the charging element, and rests the battery at step S4. For a period of time, the length of this rest period is also determined by the parameters of the known recognition standard. Finally, the battery voltage V3 after the rest is measured in step S5, and the measured amount is identified based on the known lithium battery identification standard in step S6. What is the nominal capacity of the lithium-based battery measured, this is the identification method flow of the present invention. Figure 3 shows the flow chart of the method for obtaining the lithium battery identification standard in the present invention. We can perform test experiments on clock batteries with different capacities and different charging states according to the process disclosed in this figure. Take multiple sets of identification benchmarks, the more identification benchmarks you get, you can have a more complete lithium battery identification database, and you can turn this database into the memory unit of a fast charger, so that The battery can be tested for its nominal capacity before charging. Step S6 in Figure 2 is identified based on the database obtained in this process, and the setting time of steps 2 and 4 is also set according to this database. It is designed based on a certain = example relationship between the battery voltage change value and its nominal capacity. As shown in FIG. 3, in step S10, a plurality of clock-type batteries to be charged with different nominal capacities are selected first; At step ^ 5, the initial terminal voltages VI of the plurality of lithium-based batteries are measured respectively; step S20 indicates that the plurality of lithium-based batteries are charged at the same time respectively. The two charging times and charging conditions are visible. need Adjusted to an appropriate value, for example, a constant current mode if the charge collection "g test if required to set a longer charging time can have on the nominal

122069¾

. • ▼▼ Ί. Deng:…: ¾ Λϊ 91136357 V. Description of the invention (7) The battery with a small capacity is overcharged, and it can also be considered whether the # time setting is too long to cause this method to be applied to the charger. The charging method meets the needs of fast charging; step S25 indicates that the voltage V2 of a possible number of lithium-based batteries at the time of completion of charging will be respectively; and in the restoration, the plurality of lithium-based batteries will be rested for the same period of time. ^ Step S 3 〇 Stable voltage V3 after charging. Generally for warp-type batteries, it takes 17 seconds for the voltage to drop and stabilize after charging. After step S35 \, each lithium-based battery is required to measure its voltage. V3 value; then, in step 34 respectively, do not measure the individual voltage difference between V1, V2, and V3 for each lithium battery. (V3-V1), (V2-V3), (V2) -V1) Measurement value; Step S45 is a block, that is, a block, which is used to determine whether the measured data value is sufficient. If the "column is" No ", go to step S50 and use a phase Different initial results of the electric test in step S15, and if the discrimination result in step S45 is, From step S55, ♦ = calculated from all the foregoing cyclic tests, then the plurality of batteries are compared and classified to obtain a point \ & $ value, step S60 is also a -judgment block, which is used In order to determine whether the voltage difference obtained by the γ standard can be used to clearly obtain the classification standard of each battery, ^ / ten different is " yes ", then this test is completed, and the classification standard is this one = Under the identification criteria of the plurality of warp batteries, if the result is " No " charge two, step S65, subdivide and compare the plurality / entry voltage difference data at different initial voltages π to obtain different values ^ The battery is divided into% and-subdivisions, and the classification criteria are different in this charging condition. Under Ray II VI, the multiple electric waves are attached to her, and she is pushed to a σ voltage 1220697If it is redundant if ^ 2 · ~ 36357 Five descriptions of the invention (8) Revise the flow chart shown, select 600mAh,

900mAh, 1500mAh three nominal capacity mobile phone batteries are targeted at 0. 〇 ~ 4 5 C is charged with a constant current method. After measuring the initial voltages V1 of the three internal batteries, the two batteries are charged with a smaller constant current of 3 q 〇ma for 2 minutes. (The reason for using constant current charging at 300 m A is to avoid overcharging the battery.) Once the charging is completed, the voltage V2 of the battery after charging is measured, and after 8 minutes, the amount is measured. Measure the battery's stable voltage value V3 after charging, and then complete one test, then 'restart with a different initial voltage V 1 for a second 2 minute 3 0 0mA constant current charging, and measure its V2, V3 Value, repeat the electric charging and voltage measurement with different initial voltage V1 values, and record the results as shown in Table 1: Table 1 shows 6 complete test results, including 6 0 0 mAh, 9 0 0 mAh, 1 5 0 0mAh three lithium-based batteries have measured 6 sets of V2 and V3 values under 6 different initial voltage VI values. We can find the law for the change of the terminal voltage of the battery according to the electrical characteristics of lithium ions. The V4 value in Table 1 Data for each battery and group The difference between V2 and V3 can be found from the value of V4 / Yuechu. There is a clear demarcation between the V 4 values of the two sets of different nominal valley batteries. This demarcation can be used as the reference for the identification of the three batteries. According to the embodiment, under the charging conditions, the V4 value of the Li-ion battery with a nominal capacity of 1 500 mAh is smaller than 0.063, and the nominal capacity is 90. For a 0 mAh battery, its V4 value is approximately between 0.07 and 0.09. In addition, for a lithium battery with a nominal capacity of 60 0mAh, its V 4 value is lower than 0 · 1 It is large and is a very obvious identification reference. We can enter this identification reference into the memory unit of the fast charger so that any battery can be automatically tested by the fast charger before charging.

1220697 Amendment No. 91136357 V. Description of the invention (9) The processing unit uses this criterion to determine the nominal capacity of the lithium-based battery ’and to perform the safest and most efficient formal charging. In the first embodiment described above, “It takes 20 minutes for each test of a lithium-based battery. When this test parameter is entered in the fast charger”, it takes a 20-minute test before each charge. The conventional identification technology is fast, but it is still possible to further find the shortest test time that conforms to the electrical characteristics of the clock battery, so as to give more play to the effect of the present invention that can be used for fast charging. Therefore, the second embodiment of the present invention proposes Another faster test method is also to use the common 600mAh, 900mAh, and 1500mAh three kinds of internal batteries at 0 ° C ~ 4 5 ° C for comparison, which is 1 500 m The constant current of A is charged for 20 seconds, and its voltage values V1 and V2 are recorded before and after charging. At this time, because the charging time is extremely short, although the charging current used is relatively large, it will not affect 600 mAh, 90 0mAh capacity battery is overcharged, but a clearer identification result can be obtained; and in order to shorten the test time, we measure the battery voltage V3 only after 17 seconds after measuring the V2 value. The design department is obtained through experiments. The results show that the terminal voltage value of a typical lithium-based battery can reach a stable state after only about 17 seconds; therefore, the two embodiments only take about 37 seconds, which is more efficient than the first implementation. Table 2 is the test result of this second embodiment. The charging time of only two or two batteries in 1 is shorter than that in the first embodiment, so its voltage = is not as large as that in the first embodiment. Naturally, the embodiment is not clear, so 'we especially have 10 sets of different initial electricity for each: electricity, also = u group) than the first embodiment. The total number of hours is still far longer than that of the first embodiment. Short), to judge more (but the identification criterion between tests, from Table 2 we can see that except (V3_vi) = broken different batteries 1220697

Case No. 91136357_ ^ year S Amendment V. Description of the invention (10) Judgment in this example Recalculate the difference between V 2 and V 3 to make the amount of voltage change between the batteries more clear; the list in Table 3 is the embodiment The identification criterion is that if the difference between V2 and V3 is compared first, a lithium-ion battery with a nominal capacity of 600mAh can be identified first. The (V2-V3) value of this type of battery will be greater than 0.N06V, then Then, use the difference between V3 and ¥ 1 to identify the other two types of batteries. From Table 3, we can see that if the 900mAh UOOmAh battery is identified at different initial voltage values, the identification benchmark can be Appears, as shown in the data in Table 1, and it can also be observed from the results that when the initial voltage v 1 is large, the (V3-V1) values of the two types of lithium-based batteries will be larger, at this time ~ 9 0 0 mAh The identification criteria for the two types of batteries and 1500mAh batteries will also be unclear. The total test time owed to this second embodiment is less than two minutes, so the amount of voltage change before and after charging for type j :: is bound to be different from that described in the first embodiment. It ’s small, so whether this identification criterion is accurate, we can take a random verification test as shown in Table 42: A kind of lithium 糸 battery, according to the identification criteria summarized in Table 3, I fall value pair meets Table 2 m α ^ All results of the test are present. Therefore, we can find that if you want to shorten the charging test to be accurate = confirmed; the discrimination is often f. The identification criterion for identification through a comparison of more stages is indeed possible. The time required for identification; 2 i is enough to adjust the test parameters as needed to obtain a fast "乂 t we can measure the time it takes to charge before charging" = the% method applied to 疋 is too long Lose what you want to achieve in the present invention = So if you set it to be longer = Charging work _____________ —---------, Repeatedly seeking—Positive page 1212697 Case No. 91136357 V. Description of the invention (11) The test before accurately identifying the reference power can therefore, The speed of the charger is officially charged from the nominal capacity processed by the charger, which is officially charged. In summary, the capacity is called, and if the charger is quickly identified, it is also a charge that extends the invention to other standard time. The capacity of the front and rear voltage values is changed to determine the capacity. However, the spirit used to limit the disclosure of the present invention is described by the following. It is also required to move the first memory unit to the shortest, and further, the present invention adjusts its lithium-like system to be safe. Identify the identification characteristics of capacity conditions.

Make sure the test time is complete. In the second embodiment, the test battery can only be used for less than a short time according to the aforementioned method to identify the capacity value. At the same time, the full and high-efficiency charging method is not limited to the battery and other changes. In addition, the battery is also only covered by what is familiar with the present invention. It can be shortened as much as possible, so that the charging reference can be entered into a fast pool, and the one-minute test can be used to determine the lithium battery's most efficient and accurate lithium identification. It is a standard parameter of the battery, and the method can also be applied to the effect of a fast electric power within one minute. The aforementioned test state can also be used, such as the charging method and other charging methods. The charging method can also be provided by the present invention. It is only a specific embodiment. It is not a technical change or modification specially made by the artist in the present invention.

1220697 ά ά—: '' · ·; ...,: 丨

：: '··. I V-;;;; ΐ J; —1: Case No. 91136357 W year) Month j Revised _ Simple diagram [Schematic diagram] Figure 1 before and after the lithium battery is charged Schematic diagram of terminal voltage change; Figure 2 is a flowchart of a method for identifying the nominal capacity of a lithium-based battery according to the present invention, and Figure 3 is a flowchart of a method for obtaining a lithium-based battery identification standard according to the present invention. [Number description] Initial voltage VI Battery voltage V2

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Claims (1)

☆: Qin No. 9113B357 Amendment 6. Scope of patent application1. A method for identifying the nominal capacity of warp batteries, including the following steps: charge a lithium battery for a first time and measure the voltage immediately after the charge is completed (charge completion voltage V2); Measure the voltage of the lithium battery after resting for a second period of time (post-rest voltage V3); and calculate the voltage difference (V2-V3) between the charging completion voltage V2 and the post-rest voltage V3 and determine the Nominal capacity. 2 · The method for identifying the nominal capacity of a lithium-based battery according to item 1 of the scope of the patent application, where the voltage difference (V2-V 3) and the previously indicated indication capacity and voltage difference of the lithium-based battery ( V 2-V 3), and judge the nominal capacity of the clock battery. 3 · As for the method of identifying the nominal capacity of lithium-based batteries according to item 2 of the scope of the patent application, where the relationship is for lithium-based batteries of various nominal capacities, the voltages (initial voltages) at the start of different charging are measured separately. vi) Accept the charging under the aforementioned conditions, the charging completion voltage 72 during the break and the voltage V3 after the break, and calculate the voltage difference (V2-V3), and then summarize it. 4. If the method of identifying the nominal capacity of a lithium-based battery according to item 2 of the scope of the patent application 'wherein, the first and second relationships are respectively measured for various nominal capacity lithium-based batteries' at different initial levels The voltage v 丨 receives the charging under the conditions described above, the charging completion voltage V2 during the rest and the voltage V3 after the rest, and calculates the voltage difference (V2-V3) and (with -V1), and then summarizes them. 5 · —A method for identifying the nominal capacity of a lithium battery, including the following steps: Page 19 2004.03.24.019 91136357 Sixth, the scope of the patent application is revised to measure the voltage of a lithium-based battery (initial voltage V 1); charge the lithium-based battery for a first time and measure the voltage immediately after the charging is completed (charging completed voltage V2); The voltage of the warp battery after a second period of rest (the voltage V3 after the break); and calculating the voltage difference (V2-V3) between the charging completion voltage V2 and the voltage V3 after the break and the voltage V3 after the break and the initial voltage The voltage difference (V3-VI) of VI, and based on which to judge the nominal capacity of the lithium battery. 6 · The method for identifying the nominal capacity of a lithium-based battery as described in item 5 of the scope of patent application, wherein the voltage difference (V2-V3) and the nominal capacity and voltage difference of the lithium-based battery (V2-V3) obtained in advance ) To compare the first relationship, and if necessary, compare the voltage difference (V3-V1) with the second relationship between the nominal capacity and voltage difference (V3-VI) of the lithium battery obtained in advance, and judge The nominal capacity of the clock battery. 7 · A method for identifying the nominal capacity of a Li-ion battery, including the following steps: charging a Li-series battery for a first time and measuring the voltage immediately after the charging is completed (charge completion voltage V2); measuring the lithium-based battery to rest The voltage after a period of time (post-rest voltage V 3); and calculating the voltage difference (V2-V3) between the charging completion voltage V2 and the post-rest voltage V3, and comparing the voltage difference (V2-V3) with the previously obtained Compare the first relationship between the nominal capacity of the lithium-based battery and the voltage difference (V2-V3), and if necessary, compare the voltage difference (V3-V1) with the nominal capacity and voltage of the lithium-based battery obtained in advance The second relationship of the difference (V3-V1) is compared, and Page 20 2004. 03. 24. 020 1220697 /:;,;:;;.: .. Case No. 91136357 _year 屮 屮 修 _ ^ ___ 6. Scope of patent application Judgment of the nominal capacity of the lithium battery. 8 · A method for automatically identifying the nominal capacity of a bell battery, which is a method for automatically identifying the nominal capacity of a warp-type battery by a charger before the lithium battery is officially charged with a charger. The charger includes The voltage measuring unit, the charging unit, the processing unit, and the memory unit. The method includes the following steps: The charging unit charges the lithium battery for a first time and the voltage measuring unit measures the voltage immediately after the charging is completed. (Charging completed voltage V2); the voltage measuring unit measures the voltage after the lithium battery has rested for a second time (post-resting voltage V3); and the processing unit calculates the charging completion voltage V2 and the post-resting voltage The voltage difference (V2-V3) of V3, and the relationship between the voltage difference (V2-V3) and the nominal capacity of the lithium-ion battery stored in the memory in advance is compared with the voltage difference (V 2-V 3) It is judged that the nominal capacity of the surplus battery is 0 nanometers. 9. The method for automatically identifying the nominal capacity of a lithium-based battery as described in item 8 of the scope of the patent application, wherein the relationship is to measure the voltage at the beginning of different charging (initial (Electricity, VI) Accept the charging under the above conditions, the charging during the rest and the voltage V3 'after the rest, and calculate the voltage difference (V2_V3), and then force the second: 10 · — A kind of automatic identification lithium battery charger for a lithium battery The method of positive capacity is called the capacity of the charger. 1220697;-: I Case No. 91136357 Years ^ Month Called Amendment_ VI. Method for identifying the nominal capacity of the lithium-based battery by applying for a patent, the charger includes a voltage measurement section, a charging section, a processing section, and The memory unit, the method includes the following steps: measuring the voltage of the lithium-based battery by the voltage measuring unit (initial voltage VI); charging the internal battery by the charging unit for a first time and using the voltage measuring unit Measure the voltage immediately after the charge is completed (charge completion voltage V2); measure the voltage of the lithium-based battery after the battery has rested for a second time (the voltage V3 after rest) by the voltage measurement unit; and calculate the voltage by the processing unit The voltage difference (V2-V3) between the charging completion voltage V2 and the post-break voltage V3 and the post-break voltage V3 and the initial voltage VI (V3-V1), and the voltage difference (V2-V3) and the The first relationship between the nominal capacity of the lithium-based battery stored in the memory and the voltage difference (V2-V3) is compared, and if necessary, the voltage difference (V3-VI) is stored in the memory. Lithium-based battery's nominal capacity and voltage difference (V3-V1) Two relations comparison, is judged nominal capacity of the lithium battery. Page 22 2004.03.24. 022