Briefly describe the basics of battery design
1 Purpose and basic principles of battery design
The battery design is to provide the working power or power supply with the best performance according to the requirements of the equipment. Therefore, the battery design must first meet the requirements of the electrical appliance and optimize it to have the best overall performance to determine the parameters of the battery's electrodes, electrolytes, diaphragms, casings and other components. Properly matched to make a battery or battery pack with certain specifications and specifications.
2 Battery design requirements
The battery design is designed to meet the requirements of the object (user or instrument). Therefore, before designing the battery, you must first thoroughly understand the requirements of the battery performance indicators and conditions of use, generally including the following aspects:
The operating voltage of the battery;
The operating current of the battery, that is, the normal discharge current and peak current;
Battery operating time, including continuous discharge time, service life or cycle life;
The working environment of the battery, including the state of the battery when it is working and the ambient temperature;
The maximum allowable volume of the battery.
At the same time, consideration should be given to: material source; battery performance; determinants of battery characteristics; battery technology; economic indicators; Main indicators for evaluating battery performance
Battery performance is generally evaluated mainly by the following aspects.
(1) Capacity Battery capacity refers to the amount of electricity that can be obtained from the battery under certain discharge conditions, that is, the integration of current and time. Generally, it is represented by Ah or mAh, which directly affects the maximum operating current and working time of the battery.
(2) Discharge characteristics and discharge characteristics of the internal resistance battery are the stability of the operating voltage of the batch battery under a certain discharge system, the level of the voltage platform and the high current discharge performance, etc., which indicates the capacity of the battery with load. The internal resistance of the battery includes the ohmic internal resistance and the electrochemical polarization internal resistance. When the large current is discharged, the internal resistance has a significant influence on the discharge characteristics.
(3) The working temperature range has the working environment and operating conditions of the electrical appliance, and the battery has good performance in a specific temperature range.
(4) Storage performance After the battery is stored for a period of time, the performance will change due to certain factors, resulting in self-discharge of the battery; electrolyte leakage; short circuit of the battery.
(5) Cycle life (secondary battery) The cycle life is the number of cycles when the secondary battery is charged and discharged according to a certain system, and its performance is reduced to a certain extent (for example, 60% of the initial value of the capacity).
(6) Internal pressure and overcharge resistance (secondary battery) For sealed secondary batteries such as Ni-Cd and MH-Ni, the internal pressure of the battery can be balanced during high-current charging, the balance pressure is high, and the battery is resistant. High current overcharge performance is an important indicator to measure the performance of the battery. If the internal pressure of the battery is not balanced or the equilibrium pressure is too high, the battery voltage limiting device (such as an explosion-proof ball) will be opened to cause the battery to leak or leak. Liquid, which quickly causes battery failure. If the pressure limiting device fails, it may cause the battery case to crack or explode.
3 Basic steps in battery design
The battery designer can design after clear design tasks and adequate preparation.
According to the requirements of battery users, there are two ideas for battery design: one is to supply power for rated equipment for electrical equipment and instruments; the other is to specify the size of a power supply, develop a new specification battery or profile with excellent performance. battery.
1, determine the capacity battery design steps
Determine the number of body batteries in the assembled battery, the operating voltage of the cells and the operating current density.
According to the user's requirements, determine the total working voltage of the battery pack, working current and other indicators, select the battery series, and refer to the "volt-ampere curve" (experience data or experimental results) of the series to determine the working voltage and working current density of the single battery.
Determine the number of cells in the battery pack.
Number of single cells = total battery operating voltage single cell / battery operating voltage
Calculate battery capacity
The rated capacity is calculated based on the required operating current and working time. Rated capacity = operating current * working time
Determine design capacity design capacity = rated capacity * design factor
The design factor is set to ensure the reliability and service life of the battery, generally taking 1.1-1.2
LED outdoor lighting provides aesthetic
beauty and utility to architecture. It light building, pathways, walls, garden,
fountain, etc. almost anything outdoors you want to illuminate. Our high
quality fixtures come in variety of finishes, sizes and styles to reflect
project requirement.
LED outdoor lights are either a wide voltage AC85-265V system or low voltage
12V/24V system. Of course wide voltage is very convenient for installation and
use. Low voltage systems require a transformer or power supply which converts
the high voltage to 12V/24V. It has advantages allowing the lighting fixtures
to be smaller in size and is safer round people and pets.
Our LED outdoor lighting technology and quality control system will bring the
outdoor illumination solution perfectly and make the project more economical in
its operation.
LED outdoor lighting cover kinds of category, there are Led Flood Light, street
light, High Bay Light, wall washer light, underground light, underwater light,
spike light, wall light, step light, Digital Tube light, point light, strip
light and other Decoration Lighting.
We are manufacturer, not only product we care, but also lighting solution. You
will get suitable advice.
Led Outdoor Light,Led Flood Light,Led High Bay Light,Led Street Light
ZHONGSHAN G-LIGHTS LIGHTING CO., LTD. , https://www.glightsled.com