How is the capacity of the battery defined?

The unit of capacity of the battery is AH (Ah), which is the product of current and time. The battery of 100AH capacity can be discharged after being fully charged and discharged at a current of 100A for one hour, 50A current for two hours, 20A for five hours! Of course, this is a theoretical value, and it is actually impossible to discharge at a constant current. Because the internal resistance of the battery increases as the battery capacity decreases, the terminal voltage gradually decreases, the discharge current decreases, and finally becomes the terminal voltage = 0 (this time has become excessively discharged). The over-discharge is harmful to the battery. If the battery that has been discharged for a lifetime is not charged in time, the strong acid attached to the plate within a few hours will corrode the plate and eventually cause the battery to be scrapped. Therefore, there is a battery protection circuit in the general circuit. Once the battery voltage is lower than 10.8V, the power is automatically cut off to prevent the battery from being damaged due to over discharge. (The battery inside the six-cell battery with a nominal value of 12V) A good way to measure how much energy a battery can store is to multiply the discharge current of the battery by the discharge time. The greater the battery's ampere-hour value, the more energy the battery can store. But it does not mean that the battery can be discharged with such a large current.

The amount of electricity discharged by the battery under specified conditions (including discharge intensity, discharge current and discharge termination voltage) or the length of discharge time is called battery capacity, and the unit is A·h or A·min. A car battery is a reversible DC power source that converts chemical energy into electrical energy and electrical energy into chemical energy. It is connected in parallel with the generator.

It supplies power to the starting system and the ignition system during engine start.

When the engine is stopped or low idle it supplies power to the car's electrical equipment.

When there is a demand for electricity exceeding the output of the charging system, the current is supplied by this for a limited period of time.

The battery also absorbs the transient overvoltage in the circuit to keep the voltage of the automotive electrical system stable and protect the electronic components.

The battery will not be used for a long time it will slowly discharge itself until it is scrapped. Therefore, the car should be started once every certain time to charge the battery. Another method is to pull out the two electrodes on the battery. It is necessary to remove the positive and negative electrode wires from the electrode column. First, unplug the negative wire or remove the connection between the negative electrode and the chassis of the car. Then remove the other end with the positive mark (+). The battery has a certain service life and will be replaced in a certain period of time. The same order should be followed when replacing, but when the electrode wires are connected, the order is reversed, first connected to the positive electrode and then to the negative electrode.

When the ammeter pointer indicates that the storage capacity is insufficient, it should be charged in time. The battery's storage capacity can be reflected on the dashboard. Sometimes the power is not enough on the road, and the engine can't start. As a temporary measure, you can ask other vehicles for help. Use the battery on the vehicle to start the vehicle, connect the negative and negative poles of the two batteries, and connect the positive pole to the positive pole. .

The density of the electrolyte should be adjusted according to the standard according to different regions and seasons.

Distilled water or special rehydration solution and nano-carbon sol battery activator should be added when the electrolyte is deficient. Never use pure water instead. Because pure water contains a variety of trace elements, it will have an adverse effect on the battery.

Uninterrupted use of the starting opportunity when starting the car causes the battery to be damaged due to excessive discharge. The correct method of use is to take no more than 5 seconds for each time the car is started, and the interval between starts again is not less than 15 seconds. In the case of multiple starts and still not in the car, you should find the reason from other aspects such as circuit, ignition coil or oil circuit.

Always check the small holes in the battery cover for ventilation when driving daily. If the small hole of the battery cover is blocked, the generated hydrogen and oxygen will not be discharged, and when the electrolyte expands, the battery case will be broken and the battery life will be affected.

Check the positive and negative levels of the battery for signs of oxidation. You can use hot water to constantly pour the wire connection of the battery.

Check the presence or absence of aging or short-circuiting in all parts of the circuit to prevent the battery from being decommissioned early due to excessive discharge.

1. Over-discharge

2. The battery is stored for a long time (not charged during storage)

3. Cannot be charged by car engine

4. No electrolyte

5. The electrolyte is too high

6. Charging under high temperature conditions

7. Contaminated by contaminated materials (such as hydrochloric acid, sea water, organic acids, etc.)

8. Add excessive current when charging the battery

9. The deformation of the electrode plate causes the positive plate and the plate to contact each other, thus causing a short circuit.

10. Deposited on the upper and lower parts of the pole, causing a short circuit

11. As long as you pay attention to avoid the above points, the service life of your battery will increase accordingly.

Battery capacity is one of the important performance indicators to measure battery performance. It indicates the amount of electricity discharged by the battery under certain conditions (discharge rate, temperature, termination voltage, etc.) (Discharge test can be performed with JS-150D), that is, the capacity of the battery, usually Ampere · hour is the unit (abbreviated as A·H, 1A·h=3600C).

The battery capacity is divided into actual capacity, theoretical capacity and rated capacity according to different conditions. The calculation formula of battery capacity C is C=∫t0It1dt (integration of current I during t0 to t1), and the battery is divided into positive and negative poles.

The battery capacity is divided into actual capacity, theoretical capacity and rated capacity according to different conditions.

The minimum capacity to be discharged at a certain discharge rate at 25 ° C to the termination voltage is the capacity of the specified battery at the time of design and production. This is called the rated capacity of a certain discharge rate RH.

Square lithium ion battery

Square lithium ion battery

The battery capacity is generally calculated in AH (ampere-hours), and the other is calculated in CELL (unit plate) several watts (W). (W/CELL)

1. Ah (ampere hour) calculation, discharge current (constant current) I × discharge time (hour) T. For example, if the 7AH battery has a continuous discharge current of 0.35A, the time can be continuous for 20 hours.

2. The charging time is based on 15 hours, and the charging current is 1/10 of the battery capacity. Fast charging will reduce battery life.

Battery capacity refers to the amount of battery storage. The unit of battery capacity is “MAH”, and the Chinese name is MAH (when measuring large-capacity batteries such as lead storage batteries, for the sake of convenience, it is generally indicated by “Ah”, the Chinese name is Anshi, 1Ah=1000mAh). If the rated capacity of the battery is 1300mAh, that is, the current of 130mA discharges the battery, the battery can work for 10 hours (1300mAh/130mA=10h). If the discharge current is 1300mA, the power supply time is only about 1 hour (actual working time) there are some differences due to individual differences in the actual capacity of the battery). This is an analysis under ideal conditions. The current of a digital device in actual operation cannot always be constant at a certain value. (Take digital cameras as an example, the working current will change greatly due to the opening or closing of LCD display, flash and other components), so the battery can only provide a certain value for the power supply time of a device, and this value can only be estimated through practical experience.

The page contains the contents of the machine translation.