TW201333505A - Intelligent capacity measurement method for battery set - Google Patents

Abstract

The present invention relates to an intelligent capacity measurement method for battery set, for measuring a battery set of an electric vehicle, including the steps of: measuring a voltage value of the battery set; obtaining a first current voltage value and a first prior voltage value obtained earlier than the first current voltage value; obtaining a second current voltage value and a second prior voltage value obtained earlier than the second current voltage value if the first prior voltage value is smaller than the first current voltage value; displaying a corrected voltage value if the second the prior voltage value is greater than the second current voltage value, where the corrected voltage value includes summation of a prior corrected voltage value and the second current voltage value, in which the prior corrected voltage value and the second current voltage value are each multiplied by a parameter in advance. By means of the foregoing steps, the present invention effectively overcomes the defect of inaccurate capacity measurement of battery set caused by instant load changes .

Description

Smart battery pack capacity measurement method

The invention relates to a battery capacity measuring method, in particular to a smart battery capacity measuring method for an electric vehicle.

Since the outbreak of the energy crisis in 1975, the search for alternative energy sources to reduce excessive dependence on fossil fuels has become one of the goals of all countries in the world. Among them, electric vehicles that can effectively reduce pollution and reduce oil dependence have become the direction that countries are committed to research and development. As a power source for electric vehicles, batteries can be the key to the success of electric vehicles. Currently, lead-acid batteries, nickel-cadmium batteries, nickel-iron batteries, nickel-zinc batteries, nickel-hydrogen batteries, sodium-nickel-nickel batteries, and lithium batteries are under development. Lithium iron batteries, lithium ion batteries, fuel cells and solar cells, etc., have the highest fuel cell efficiency, but their cost is also high.

The existing battery pack capacity display is mostly applied to lead-acid battery packs, and the characteristics cannot be adjusted in time. Take 4 series 12V lead-acid batteries as an example. The working voltage range is 42V (10.5V*4 batteries) to 54V (13.5V*4 batteries). If the voltage capacity display uses 16-string lithium-iron batteries, its working voltage range 40V (2.5V * 16 batteries) to 58.4V (3.65V * 16 batteries), if the lithium iron battery pack is fully charged, use 54V, according to the lithium iron battery discharge curve about half capacity, but at this time lead acid The battery's capacity display is full and has significant errors.

Taking 48V12 string lithium iron battery as an example, about 90% of the capacity voltage falls at 51-54V. The battery discharge voltage (58.4V to 54V) and the final phase (51V to 40V) voltage drop rapidly. The average user does not know the battery. The feature will assume that the battery pack is faulty.

The principle is that the current battery voltage measurement method is an immediate voltage response, but it is limited by the chemical reaction of the line power group, the battery inner group and the battery. The instantaneous voltage response cannot correctly express the remaining capacity of the battery, especially when the motor accelerates. The battery output current is large, and the displayed capacity is instantaneously dropped. When the motor speed is stable, the capacity is increased and the user is confused.

Therefore, how to solve the above problems and deficiencies in the above-mentioned applications, that is, the inventors of the present invention and those involved in the industry are eager to study the direction of improvement.

Therefore, in view of the above-mentioned deficiencies, the inventors of the present invention have collected relevant materials, and have evaluated and considered such patents through continuous evaluation and modification through multi-party evaluation and consideration, and through years of experience in the industry.

The main object of the present invention is to provide a smart battery pack capacity measuring method applied to an electric vehicle.

In order to achieve the above object, the present invention provides for measuring a battery pack of an electric vehicle in accordance with the following steps:

Step (110): measuring a voltage value of the battery pack;

Step (120): obtaining a first current voltage value and a first previous voltage value that is earlier than the first current voltage value;

Step (130): if the first previous voltage value is less than the first current voltage value;

Step (140): obtaining a second current voltage value and a second previous voltage value that is earlier than the second current voltage value;

Step (150): if the second previous voltage value is greater than the second current voltage value;

Step (160): displaying a correction voltage value, the correction voltage value comprising a sum of a previous correction voltage value and the second current voltage value, wherein the previous correction voltage value and the second current voltage value are respectively multiplied by One parameter.

Wherein, since the step (160) of the present invention includes displaying a correction voltage value, the correction voltage value includes a sum of a previous correction voltage value and the second current voltage value, whereby the present invention is effective for the prior art electric vehicle The problem of the battery pack capacity error caused by the instantaneous change of the load is broken. The battery capacity measuring method of the present invention detects the current battery capacity display error by the steps (130) and (150), when the battery capacity is generated. When the display generates an error, a correction voltage value is displayed to improve the battery pack capacity error caused by the instantaneous change of the load.

Moreover, the present invention can be easily installed on an existing electric vehicle, and the program can be easily changed by using the online burning method without changing the circuit, and can be applied to various battery packs and various battery packs. The invention has the advantages of easy modification and high compatibility.

In order to achieve the above objects and effects, the technical means and the structure of the present invention will be described in detail with reference to the preferred embodiments of the present invention.

Please refer to the first embodiment and the second figure, which are flowcharts and block diagrams of a preferred embodiment of the present invention. It can be clearly seen from the figure that the smart battery capacity measuring method of the present invention is provided for measurement. One of the electric vehicle battery packs, as shown in the first figure, is executed according to the following steps:

Step (110): measuring a voltage value of the battery pack;

Step (120): obtaining a first current voltage value and a first previous voltage value that is earlier than the first current voltage value;

Step (130): if the first previous voltage value is less than the first current voltage value;

Step (140): obtaining a second current voltage value and a second previous voltage value that is earlier than the second current voltage value;

Step (150): if the second previous voltage value is greater than the second current voltage value;

Step (160): displaying a correction voltage value, the correction voltage value comprising a sum of a previous correction voltage value and the second current voltage value, wherein the previous correction voltage value and the second current voltage value are respectively multiplied by One parameter.

It should be noted that the smart battery pack capacity measuring method of the present invention is an electric vehicle that uses a battery as a power source, such as an electric motor vehicle, an electric bicycle, or an electric vehicle, and is merely an example and is not a limitation; The battery pack may be a lead acid battery, a lithium iron battery, a lithium poly battery, a lithium manganese battery, or other battery packs that are connected in series and in parallel.

In the step (110), the voltage value of the battery pack is measured first.

In the step (120), after the battery pack is measured through the step (110), the battery pack is respectively measured to obtain a first current voltage value and one of the first current voltage values at different times. The previous voltage value, which can be set to 0.1 second.

In the step (130), the first current voltage value obtained in the step (120) and the first previous voltage value are compared, and the step is performed if the first previous voltage value is less than the first current voltage value. (140). If the first previous voltage value is greater than the first current voltage value, setting the first previous voltage value to the first current voltage value, performing step (120).

In the step (140), the battery pack is respectively measured to obtain a second current voltage value and a second previous voltage value that is earlier than the second current voltage value.

In the step (150), the second current voltage value obtained in the step (140) and the second previous voltage value are compared, and the step is performed if the second previous voltage value is greater than the second current voltage value. (160). If the second previous voltage value is less than the second current voltage value, setting the second previous voltage value to the second current voltage value, performing step (140).

In the step (160), after confirming the foregoing steps, it can be determined that the current battery capacity display of the electric vehicle is incorrect at this time, so a correction voltage value needs to be displayed to display the correct battery capacity, and the correction voltage value includes a previous And a sum of the corrected voltage value and the second current voltage value, wherein the previous corrected voltage value and the second current voltage value are respectively multiplied by a parameter. Can be embodied as the following formula:

Vdisp=m×Vnow+(1-m)×Vo

Where Vdisp is the correction voltage value, m is the parameter, and can be set to 0.8, Vnow is the second current voltage value, and Vo is the previous correction voltage value.

It should be particularly noted that if the electric vehicle is the first method of the present invention, the Vo is measured by the battery pack for a long time, for example, the first current voltage value is taken as Vo, and the Vo is utilized. The ROM or EEPROM or other medium is used for storage. If the method of the present invention is not performed for the first time, the Vdisp of the method of the present invention is used last time as Vo.

After the calibration voltage value is corrected, in order to avoid an error in the next battery capacity display, the step (120) must be repeated.

Further, as shown in the second figure, the smart battery capacity measuring method of the present invention is applied to an electric vehicle, and the system block diagram thereof includes a battery pack 1, a voltage stabilizing circuit 2, a central processing unit 3, and a display module 4, which are respectively briefly described as follows :

The battery pack 1 may be a lead acid battery, a lithium iron battery, a lithium poly battery, a lithium manganese battery, or other battery packs 1 in which various types are connected in series and in parallel.

The voltage stabilizing circuit 2 provides low system power consumption and provides a system constant pressure environment, and the battery pack itself supplies system energy without additional power supply.

The central processing unit 3 is responsible for detecting the battery pack voltage, and estimating the remaining capacity of the battery pack with reference to the pre-stored and internal memory information, and displays the same on the display module. This internal memory information varies with different models and battery packs, and the hardware circuits are the same, as long as the information can be changed by the online burner.

The display module 4 uses a plurality of LEDs, and allows the user to know the remaining capacity of the battery pack in terms of the number of bright ones. It should also be a feasible solution if the pointer display is used.

In a preferred embodiment, the electric motorcycle or the electric bicycle is the best application range. After the manufacturer uses the online burner to program, it can be installed on the electric motorcycle panel or the bicycle handlebar, and the user can see The remaining capacity of the battery pack, and then the estimated number of miles that can be traveled. In practical applications, the present invention can be applied to an existing voltmeter without increasing the manufacturing cost, and only the original microprocessor program needs to be rewritten, and those skilled in the art should be able to easily understand.

Please refer to the third, fourth and fifth figures, which are schematic diagrams of the first embodiment, the second embodiment and the third embodiment of the preferred embodiment of the present invention. It can be clearly seen from the figure that the measurement condition of the embodiment is The 40Kg500W electric bicycle uses a 48V lithium battery pack. As shown in the third figure, after the start, the throttle is added to the end and continues to 10 seconds to return to the throttle. In 15 seconds, the throttle is added to the end and the throttle is returned in 17 seconds.

This step (130) is approximately between 2 and 5 seconds in the figure, and the step (150) is approximately between 5 and 10 seconds in the figure. Since both are eligible, step (160) is performed.

As shown in the fourth figure, the LED capacity display map before uncorrected, it can be seen from the figure that the LED capacity display before uncorrected has a considerable error, and the condition is that 10 LEDs are used to display the instantaneous battery voltage, of which 42V to 55V. It is divided into 10 equal parts. Above 55V, it means that there are still 10 LEDs above the full scale, and 42V or less means no capacity, so it will not light.

As shown in the fifth figure, the corrected LED capacity display is the same as the fourth figure, but as can be seen from the figure, after the correction of the method of this patent, the corrected battery capacity is displayed.

Through the above detailed description, it can fully demonstrate that the object and effect of the present invention are both progressive in implementation, highly industrially usable, and are new inventions not previously seen on the market, and fully comply with the invention patent requirements. , 提出 apply in accordance with the law. The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention. All changes and modifications made in accordance with the scope of the invention shall fall within the scope covered by the patent of the invention. I would like to ask your review committee to give a clear explanation and pray for it.

Steps (110) to (160)

1. . . Battery

2. . . Regulator circuit

3. . . Central processing unit

4. . . Display module

The first figure is a flow chart of a preferred embodiment of the invention.

The second drawing is a block diagram of a preferred embodiment of the invention.

The third figure is a first embodiment of the preferred embodiment of the present invention.

The fourth figure is a second embodiment of the preferred embodiment of the present invention.

The fifth drawing is a third embodiment of the preferred embodiment of the present invention.

Steps (110) to (160)

Claims (5)

A smart battery capacity measuring method for measuring a battery pack of an electric vehicle is performed according to the following steps: step (110): measuring the voltage value of the battery pack; step (120): obtaining a first present And a voltage value and a first previous voltage value that is earlier than the first current voltage value; step (130): if the first previous voltage value is less than the first current voltage value; and step (140): obtaining a second current voltage a value and a second previous voltage value that is earlier than the second current voltage value; step (150): if the second previous voltage value is greater than the second current voltage value; and step (160): displaying a corrected voltage value, The correction voltage value includes a sum of a previous correction voltage value and the second current voltage value, wherein the previous correction voltage value and the second current voltage value are respectively multiplied by a parameter. The smart battery capacity measuring method according to claim 1, wherein the electric vehicle is an electric motor vehicle, an electric bicycle or an electric vehicle. The smart battery capacity measuring method according to claim 1, wherein if the first previous voltage value is greater than the first current voltage value, setting the first previous voltage value to the first current voltage value, and executing Step (120). The smart battery capacity measuring method according to claim 1, wherein if the second previous voltage value is less than the second current voltage value, setting the second previous voltage value to the second current voltage value, performing Step (140). The smart battery capacity measuring method according to claim 1, wherein the step displays a correction voltage value, the correction voltage value comprising a sum of a previous correction voltage value and the second current voltage value, wherein After the previous correction voltage value and the second current voltage value are respectively multiplied by a parameter, step (120) is performed.