How to judge the battery power of the car?

Appearance inspection, some batteries will be deformed after the battery is broken, and some even leak, so it can be intuitively judged whether the battery is good or bad.

Method for judging battery life

Open circuit check, after the battery terminal or internal open circuit, there will be a failure that the battery cannot be charged and discharged. When charging, the battery segment voltage directly reaches the highest voltage value of the charger output, and after the charger is removed, the battery terminals are measured. No voltage, if there is no voltage, the battery is broken.

Short-circuit inspection, battery terminals or internal short-circuit, will cause serious battery self-discharge and large charging current.

Capacity decreased, the actual discharge of battery capacity is less than about 60% of the rated capacity, the maintenance has no obvious rise, scrap can be determined.

When the battery is charged and heated, when the positive electrode of the battery softens, causing the active material to fall off, the internal resistance is increased, and the impurities in the plate are largely detached, which increases the gas-discharging rate during charging, which not only increases the heat generation during charging of the battery, but also increases the weight. The self-discharge of the battery causes the battery to be out of power in a short period of time. At this time, the battery should be replaced.

First, detect the battery storage capacity with voltmeter and load

Detecting the battery storage capacity, it is difficult to be accurate only by using the voltmeter or the multimeter voltage without load block to check whether the battery is fully charged. When measuring voltage alone, the current consumption is extremely small, so there is no large voltage drop inside the battery, so the display voltage is not low, but if a considerable load is added, such as turning on the headlight (load current 10 to 15A), press The horn (load current 6 ~ 12A), the battery will make the light dim, the horn is hoarse, thus showing insufficient power storage.

Accurate and reliable detection method is through to start the machine in the car battery voltage, the steps are as follows: under normal temperature in engine will be a meter on the positive and negative of battery, pull out the fuel injector wires, the engine won't start.5 ~ 10 seconds, start the engine run continuously at the same time observe the voltmeter readings, under the condition of the starter and wiring of good, in 9.6 V or 12 V battery voltage is higher than 9.6 V, that battery technology is in good condition; If the voltage is lower than the value, then battery lost electricity, save electricity shortage.

Second, use a hydrometer to check the battery storage capacity

Using hydrometer to detect battery remaining power is also a kind of commonly used methods. Generally charged battery electrolyte in 20 ℃ standard proportion is 1.25 ~ 1.29 kg/l; If the battery at 20 ℃ electrolyte specific gravity is less than the value, is greater than 1.06 kg/l battery storage battery is low, need to recharge; If the battery at 20 ℃ electrolyte specific gravity of 1.06 kg/l or less means that the battery has been completely discharge or damage. According to this principle, the use of balance to measure the proportion of battery electrolyte can know battery to save electricity, also can further determine the condition of the battery.

Third, battery detector to detect battery power

In the daily maintenance and repair, it is really necessary to quickly and accurately detect the amount of battery storage, or use a battery tester. When using the battery monitor access to the battery 10 ~ 15 seconds, keep the voltage at 10.5 ~ 11.6 V, said capacity is enough, storage battery trouble-free. Keep the voltage at 9.6 V ~ 10.5 V, said capacity is insufficient, battery trouble-free; Voltage has dropped below 9.6 V, a serious shortage of capacity or the battery is faulty. This is just a simple battery tester, only in the condition of large current discharge test the battery voltage, roughly assess the battery power. At present more advanced battery discharge detector in addition to start, can accurately measure the cold start current (CCA).

Fourth, conclusion

Above all, car storage battery capacity testing method is: the voltmeter or multimeter voltage blocking and load detection, hydrometer detection capacity, with dedicated detector to detect battery capacity.

The nominal capacity of the battery is ampere (AH), where the (A) discharge current and the time (H) is the discharge time. Therefore, accurate measurement of battery capacity is the product of discharge current and discharge time.

The required materials are: battery, ammeter, voltmeter, high-power discharge resistor (loading appliance), switch and stopwatch.

First fully charge the battery to be measured to ensure that the capacity is optimal.

The battery current meter with the switch in series, high-power discharge resistance, and parallel voltmeter resistance at both ends and adjustable resistance is used to control the discharge current.(note, there is no discharge resistor load appliances can be used instead of).

At the start of the measurement should be recorded, close the switch at the same time press the stopwatch, at this time to record the voltmeter and ammeter reading. Observe voltmeter and ammeter reading changes, when the two pieces of electric meter reading became hours, stop the stopwatch, recording time.

Calculate the current value of battery capacity is the ampere, time is hours, to record the current times the time is the capacity of the battery.

1, detect the battery storage capacity with voltmeter and load

Test battery to save electricity, use only the voltmeter or multimeter voltage without load block to check whether the battery of electricity is enough, is difficult to accurately. Just measure the voltage, the current consumption is few, so will have big pressure drop inside the battery, so according to the voltage is not low, but with quite a load, such as open headlight (load current 10 ~ 15 a), the horn (load current 6 ~ 12 a), the battery will dim the lights, horn husky, which shows a lack of electricity.

Accurate and reliable detection method is through to start the machine in the car battery voltage, the steps are as follows:

A under normal temperature, the engine will be a meter on the positive and negative of battery, pull out the fuel injector wires, the engine won't start;

B, Start the engine for 5 to 10 seconds continuously, and observe the degree of the voltmeter;

C, When the starter and the line are well connected, the battery voltage of 12V is 9.6V or higher than 9.6V, indicating that the battery technology is in good condition; if the voltage is lower than the above value, the battery is in a deficient state and the stored power is insufficient.

2, use a hydrometer to check the battery storage capacity

It is also a common method to use the hydrometer to detect the storage capacity of the battery. Generally, the standard specific gravity of the electrolyte at 20 ° C is 1.25 ~ 1.29 kg / L; if the battery is at 20 ° C, the specific gravity of the electrolyte is less than the above value If it is greater than 1.06kg/L, the battery storage capacity is insufficient and needs to be charged. If the battery has a specific gravity of 1.06kg/L or less at 20 °C, the battery is completely discharged or damaged. According to this principle, the specific gravity of the battery electrolyte can be measured by a hydrometer to know the storage capacity of the battery, and the condition of the battery can be further determined.

3, battery detector to detect battery power

Real in the daily maintenance and repair can rapidly and accurately detect the battery how much to save electricity, or to use the battery tester.

When using the battery monitor access to the battery 10 ~ 15 seconds, keep the voltage at 10.5 ~ 11.6 V, said capacity is enough, storage battery trouble-free.

Keep the voltage at 9.6 V ~ 10.5 V, said capacity is insufficient, battery trouble-free;

Voltage has dropped below 9.6 V, a serious shortage of capacity or the battery is faulty.

This is just a simple battery tester, only in the condition of large current discharge test the battery voltage, roughly assess the battery power. At present more advanced battery discharge detector in addition to start, can accurately measure the cold start current (CCA), such as boschbat131 battery tester.

The BoschBAT131 battery conductance and electrical system analyzer can test 6V and 12V wet batteries, flat AGM, spiral AGM and gel batteries, as well as test 12V and 24V start and charge systems for passenger cars and light trucks. It displays the test results in seconds and provides the print results.

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