KR20120024009A

KR20120024009A - Battery sensor module

Info

Publication number: KR20120024009A
Application number: KR1020100086533A
Authority: KR
Inventors: 서성석; 조성우
Original assignee: 현대모비스 주식회사
Priority date: 2010-09-03
Filing date: 2010-09-03
Publication date: 2012-03-14

Abstract

PURPOSE: A battery sensor module is provided to eliminate a resistance value measuring unit installed between a (-) terminal and a cable of a battery by calculating a current value and checking the state of battery. CONSTITUTION: A cable(5) connects a (-) terminal and a ground of a battery. A control unit(7) measures the voltage values of both ends of the cable and calculates a current value applied to the cable based on the voltage values of the both ends and an internal resistance value. The internal resistance value is set at the cable.

Description

Battery sensor module

The present invention relates to a battery sensor module, and more particularly, to a battery sensor module that can delete the resistance value measuring means installed between the cable and the negative terminal of the battery to check the state of the battery.

In general, a battery is disposed in an engine room of a vehicle to supply the overall electricity required for the vehicle.

Recently, a hybrid car equipped with an internal combustion engine and a battery engine at the same time, and an electric vehicle that can be driven only by the battery engine have been developed, thereby contributing to an environmentally friendly business by reducing emissions.

Since the hybrid car and the electric vehicle receive engine power from the battery, it is important to manage the battery.

Therefore, the battery is equipped with a battery sensor module for calculating the current value of the battery so as to determine the state of charge of the battery, the degree of aging and the ability to restart.

An object of the present invention is to provide a battery sensor module that can delete the resistance value measuring means that was installed between the (-) terminal and the cable of the battery to check the state of the battery.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the battery sensor module according to an embodiment of the present invention, the cable connecting the negative terminal of the battery and the vehicle ground, and measures the voltage value between both ends of the cable and the voltage value between both ends and the cable And a controller configured to calculate a current value applied to the cable based on the set internal resistance value of.

Specific details of other embodiments are included in the detailed description and drawings.

The battery sensor module according to the present invention measures a voltage value at both ends of a cable connecting a negative terminal of a battery and a vehicle body ground, and is applied to the cable based on the voltage value at both ends and a set internal resistance value of the cable. Since the state of the battery can be confirmed by calculating the current value, the resistance value measuring means provided between the negative terminal of the battery and the cable can be deleted to calculate the current value.

The effects of the present invention are not limited to the above-mentioned effects, and other effects that are not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a perspective view illustrating a state in which a cable included in a battery sensor module according to an embodiment of the present invention is coupled between a battery and a vehicle body;
2 is a schematic diagram of a battery sensor module according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Hereinafter, a battery sensor module according to an embodiment of the present invention will be described with reference to the drawings.

1 is a perspective view illustrating a state in which a cable included in a battery sensor module according to an embodiment of the present invention is coupled between a battery and a vehicle body, and FIG. 2 is a schematic view of a battery sensor module according to an embodiment of the present invention.

1 and 2, a battery sensor module according to an embodiment of the present invention includes a cable 5 connecting the ground terminal of the battery 1 to the ground of the vehicle body 2, and a cable 5. The control unit 7 for checking the state of the battery 1 by calculating the current value (I) applied to the).

The control unit 7 measures the voltage value V at both ends of the cable 5 and applies it to the cable 5 based on the voltage value V at both ends and the set internal resistance value R of the cable 5. The state of the battery 1 is checked by calculating the current value I to be obtained. Therefore, it is possible to delete the shunt resistor, which is the resistance value measuring means that was provided between the existing (-) terminal 3 and the cable (5).

When the voltage value V between both ends of the cable 5 is measured, the controller 7 may calculate the current value I applied to the cable 5 through Equation 1 below.

[Equation 1]

Here, I: current value applied to the cable 5

V: Voltage value at both ends of cable 5

R: Internal resistance value of the cable (5)

The internal resistance value R of the cable 5 may be calculated through Equation 2 below.

[Equation 2]

Where R is the internal resistance of the cable 5

: Specific resistance value of cable (5)

L: length of cable (5)

A: cross section of the cable 5

By the way, the cable 5 consists of a conductive conductor (for example, copper). Therefore, the cable 5 has a very low resistance value, which may not accurately calculate the current value I.

In order to prevent this, the control unit 7 has the length (L), cross-sectional area (A) and the specification resistance value according to the material of the cable 5, which is the resistance value calculated through Equation 2, as it is, The resistance value calculated by correcting the deviation from the experimental resistance value which can be calculated by Equation 1 through the experiment without setting the internal resistance value R is the internal resistance value R of the cable 5. Is set.

That is, an experiment calculated through Equation 1 using the spec resistance value and the voltage value V between both ends of the cable 5 measured when the predetermined current value I is applied to the cable 5. The resistance value calculated by correcting the deviation from the resistance value is set to the internal resistance value R of the cable 5.

For example, the resistance value according to the length (L), the cross-sectional area (A) and the material of the cable 5 in the product production line is determined as the specification resistance value through [Equation 2]. Then, when the voltage value (V) between both ends of the cable 5 is measured by applying a current value I of -100 amps and +100 amps to both ends of the cable 5, the cable (Equation 1) The experimental resistance value of 5) can be calculated. As such, the resistance value calculated by correcting the deviation between the spec resistance value determined through [Equation 2] and the experimental resistance value calculated through [Equation 1] is the internal resistance value R of the cable 5. Is set in the control unit 7.

Therefore, when the control unit 7 measures the voltage value V between both ends of the cable 5, the control unit 7 uses the set internal resistance value R of the cable 5 to connect the cable 5 through [Equation 1]. The state of the battery 1 can be confirmed by calculating the current value I applied. Here, the state of the battery 1 means the state of charge of the battery 1, the degree of aging, the ability to restart. That is, the controller 7 may determine whether the battery 1 is charged by calculating the current value I applied to the cable 5.

The controller 7 may determine that the battery 1 is not charged when the current value I applied to the calculated cable 5 is equal to or less than the set reference current value, and inform the driver.

On the other hand, the resistance value of the cable 5 changes according to the ambient temperature. Therefore, the control unit 7 should correct the internal resistance value R of the set cable 5 in real time according to the ambient temperature.

The controller 7 may correct the internal resistance value R of the cable 5 according to temperature through Equation 3 below.

&Quot; (3) "

Where R is the internal resistance of the cable 5

: 0 ° C reference resistance of cable (5)

: Temperature constant of cable (5)

T-T ': temperature change

In order for the controller 7 to correct the internal resistance value R through the above Equation 3, it is necessary to find out the change in the ambient temperature. Therefore, the battery sensor module according to the embodiment of the present invention further includes a temperature sensor 9. The temperature sensor 9 may be disposed on the circuit board together with the control unit 7.

Meanwhile, the cable 5 may generate noise due to a sudden current applied from the battery 1. The noise is processed by a hardware / software filter. The hardware filter may be an RC filter, and the software filter may be a sinc3 filter.

As described above, the battery sensor module according to the present invention measures the voltage value V between both ends of the cable 5 connecting the (-) terminal 3 of the battery 1 to the ground of the vehicle body 2 and the voltage between both ends. On the basis of the value V and the set internal resistance value R of the cable 5, the current value I applied to the cable 5 can be calculated to confirm the state of the battery 1, so that the current value In order to calculate (I), the shunt resistor, which is a resistance value measuring means that was provided between the negative terminal 3 and the cable 5 of the battery 1, can be deleted.

Those skilled in the art will appreciate that the present invention can be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalent concept are included in the scope of the present invention. Should be interpreted.

1: battery 2: body
3: (-) terminal 5: cable
7: control unit 9: temperature sensor

Claims

A cable connecting the negative terminal of the battery to the vehicle body ground; And
And a controller which measures a voltage value at both ends of the cable and calculates a current value applied to the cable based on the voltage value at both ends and a set internal resistance value of the cable.

The method according to claim 1,
The internal resistance value is a test resistance value calculated using a spec resistance value according to the cross-sectional area, length and material of the cable, and a voltage value measured at both ends of the cable when a predetermined current value is applied to the cable. Battery sensor module calculated by correcting the deviation.

The method according to claim 1,
Further comprising a temperature sensor for detecting the ambient temperature,
The control unit is a battery sensor module for correcting the internal resistance value according to the temperature sensed by the temperature sensor.

The method according to claim 1,
The controller checks whether the battery is charged based on the current value.

The method according to claim 1,
The controller determines that the battery is not charged when the current value is less than the set reference current value.