TWI509269B - Cell voltage monitoring and self-calibrating device - Google Patents

Description

Battery voltage monitoring and self-calibration device

The invention relates to a battery voltage monitoring and self-correcting device, in particular to a battery voltage monitoring and self-correcting device for a plurality of batteries connected in series. The invention can be applied to measuring the voltage of individual cells within a battery pack. The battery pack can be used in battery powered devices such as electric vehicles, power tools, and the like.

A rechargeable battery is a combination of one or more electrochemical units, and because the electrochemical reaction is electrically reversible, it is called a secondary battery. Among all rechargeable batteries, lithium batteries are the most commonly used. It can be used in many electrical products, such as electric vehicles, electric motorcycles, power tools and toys. Stable power supply, light and short form factor and refillability are the application advantages.

Lithium battery power management requires a very accurate voltage measurement circuit. Regardless of electric vehicles, electric motorcycles, power tools or toys, lithium battery applications require many serial lithium batteries. In general, an analog digital converter or a digital analog converter for high voltage is a necessary component. However, each analog-to-digital converter has different characteristics than other analog-to-digital converters. In other words, the measurement of each analog-to-digital converter will be different from other analog-to-digital converters. The analog digital converter must be calibrated before the measurement job begins. This is great if an analog-to-digital converter can self-calibrate at work. In addition, analog digital conversion The calibration cost of the device is very expensive. The power management of lithium batteries still needs to be improved.

In order to overcome this disadvantage, a charge and discharge supply system is disclosed in U.S. Patent No. 7,554,291. Please refer to Figure 1. The system includes a plurality of batteries connected in series; a plurality of battery state detecting segments, the detecting segments are installed for the respective battery segments, configured to detect the charging state of the respective corresponding battery segments; and a power control segment configured to Performing power control of the battery segment; a first electrical isolation segment, the first electrical isolation segment is disposed on a first signal router, and the power control segment is connected to one of the battery state detection segments, and the battery state detection segment is used And a second electrical isolation segment is disposed on a second signal router, wherein the battery state detection segment is used for a lowest potential battery segment.

Next, please refer to Figure 2. Another prior disclosure is disclosed in U.S. Patent Application Serial No. 2006/0132139. A device measures a battery voltage while scanning a battery in a battery group, wherein a plurality of batteries are connected in series with each other. The device has a first switching device and a voltage detecting device. The first switching device is connected in series with a signal line carrying a battery voltage. The voltage detecting device detects the battery voltage, and the battery is electrically connected to the signal line, and the signal line carries the voltage value of the battery belonging to the battery group. When the first switching device is electrically connected to a connection point (between two consecutive battery groups), the first switching device is shared by the two battery groups.

The above predecessor reveals some breakthroughs in battery voltage detection. However, they require additional components and integrated circuits for voltage conversion, which incurs additional cost. At the same time, self-correction is not feasible. Although the correction problem can be solved by connecting each battery to a corrector, if a battery pack With multiple batteries, the number of correctors required will be quite large, and the overall manufacturing cost will undoubtedly increase. In addition, if a single corrector is used for a plurality of batteries, the overall voltage requirement of the corrector will become very high, and as a result, the manufacturing cost will also increase significantly. Therefore, there is a need for a battery voltage monitoring device that has self-correcting capabilities and does not have to rely on a large number of correctors to reduce overall production costs.

This paragraph of text extracts and compiles some of the features of the present invention; other features will be described in subsequent paragraphs. Its purpose is to cover the spirit and scope of the subsequent patent scope, different retouching and similar arrangements.

According to one aspect of the present invention, a battery voltage monitoring and self-correcting apparatus for a plurality of batteries includes: a first voltage measuring unit for measuring a voltage value of a first battery and a second battery; a second voltage measuring unit for measuring voltage values of the second battery and a third battery; a first compensation unit connected to the first voltage measuring unit, wherein the first and second batteries are The measured voltage value is multiplied by a first compensation value to adjust the voltage values of the first and second batteries; a second compensation unit is connected to the second voltage measuring unit, by the second and the second The voltage value measured by the three batteries is multiplied by a second compensation value to adjust the voltage values of the second and third batteries; and a calculating unit is connected to the first voltage measuring unit and the second voltage measuring unit The first compensation unit and the second compensation unit are measured by the first voltage measuring unit and the second voltage measuring unit. The voltage value of the battery is used to calculate the first compensation value and the second compensation value, so that the voltage value of the second battery is adjusted after being adjusted by the first compensation unit and the second compensation unit respectively, so that each The systematic measurement error of the battery can be incorporated into a single variable for self-correction.

According to the concept of the present invention, the first, second and third batteries are connected in series.

According to the present concept, the first compensation value is set to 1.

According to the present concept, the second compensation value is set to 1.

According to the present invention, the battery voltage monitoring and self-correcting device further includes a voltage reference unit for providing a standard voltage reference to the computing unit.

According to the present invention, the standard voltage reference is an actual voltage value of the plurality of series connected batteries or an actual voltage value of one of the batteries.

According to the present concept, the calculation unit calculates a third compensation value by dividing the standard voltage reference by the corresponding adjustment voltage value.

According to the present invention, the voltage values of the first and second batteries are adjusted by multiplying the voltage values measured by the first and second batteries by the first compensation value and the third compensation value. The three-cell voltage value is adjusted by multiplying the voltage value measured by the third battery by the second compensation value and the third compensation value, thereby achieving the purpose of self-correction.

According to the present invention, the battery voltage monitoring and self-correcting device further includes a first multiplexer for mutually receiving voltage values of the first battery and the second battery, and sequentially outputting the voltage value to the first voltage a measuring unit; and a second multiplexer for mutually receiving the second battery and the third The voltage value of the battery, and the voltage value is sequentially output to the second voltage measuring unit.

According to the present invention, the voltage value of the second battery measured by the first voltage measuring unit is multiplied by the first compensation value, which is equivalent to the second battery measured by the second voltage measuring unit. The voltage value is multiplied by the second compensation value.

According to the present concept, the battery is a rechargeable battery.

According to the present invention, the rechargeable battery is a lithium battery.

According to the concept of the present invention, the first voltage measuring unit can simultaneously measure voltage values of more than two batteries.

According to the present concept, the second voltage measuring unit can simultaneously measure the voltage values of more than two batteries.

According to another aspect of the present invention, a battery voltage monitoring and self-correcting apparatus includes: at least two voltage measuring units for measuring voltage values of a plurality of batteries, wherein at least one of the batteries is measured by two of the voltages The unit is measured; at least two compensation units are respectively connected to a voltage measuring unit, and the voltage value of the battery is adjusted by multiplying the voltage value measured by the battery by a first compensation value; a calculating unit, Connected to the voltage measuring unit and the compensation unit, the first compensation value is calculated by the voltage value of the battery measured by the two voltage measuring units, so that the voltage value of the battery is respectively via the two The compensation unit is adjusted to be consistent so that the systematic measurement error of each battery can be incorporated into a single variable for self-correction.

According to the concept of the case, the battery voltage monitoring and self-correcting device further A voltage reference unit is included to provide a standard voltage reference to the computing unit.

According to the present invention, the standard voltage reference is an actual voltage value of the plurality of series connected batteries or an actual voltage value of one of the batteries.

According to the present concept, the calculation unit calculates a second compensation value by dividing the standard voltage reference by the corresponding adjustment voltage value.

According to the present invention, the voltage value of the battery is adjusted by multiplying the voltage value measured by the battery by the first compensation value and the second compensation value, thereby achieving the purpose of self-correction.

According to the present invention, the battery voltage monitoring and self-correcting device further includes at least one multiplexer to alternately receive the voltage value of the battery and output the voltage value to the voltage measuring unit.

The invention will be more clearly described with reference to the following examples. It is to be noted that the following description of the embodiments of the present invention is intended to be illustrative only.

For a better understanding of the present invention, a detailed description will be given by way of two embodiments.

First embodiment

Please refer to FIG. 3, which illustrates a first embodiment. It shows the layout design of a battery voltage monitoring device 10. The battery voltage monitoring device 10 can Self-corrected and applied to several batteries in series. In this embodiment, the battery voltage monitoring device 10 is connected to a battery pack 20. The battery pack 20 has a first battery 201, a second battery 202, and a third serially connected in series as shown in FIG. Battery 203. All of the batteries mentioned above are rechargeable batteries. Preferably, it is actually a lithium battery.

The battery voltage monitoring device 10 includes a first multiplexer 111, a first voltage measuring unit 112, a first compensation unit 113, a second multiplexer 121, a second voltage measuring unit 122, and a first The second compensation unit 123 and a calculation unit 150.

First, the first multiplexer 111 alternately receives the voltages of the first battery 201 and the second battery 202, and sequentially outputs the voltage to the first voltage measuring unit 112. At the same time, the second multiplexer 121 alternately receives the voltages of the second battery 202 and the third battery 203, and sequentially outputs the voltage to the second voltage measuring unit 122.

After the first voltage measuring unit 112 receives the voltage from the first multiplexer 111 via the channels VSS_1.1, VCC_1.1, VSS_1.2, and VCC_1.2, the first voltage measuring unit 112 will measure the first The voltage value of one battery 201 and second battery 202. The measured voltage value of the first battery 201 is V _{1_1} and the measured voltage value of the second battery 202 is V _{2_1} . Similarly, after the second voltage measuring unit 122 receives the voltage from the second multiplexer 121 via the channels VSS_2.1, VCC_2.1, VSS_2.2, and VCC_2.2, the second voltage measuring unit 122 measures the voltage. The voltage values of the second battery 202 and the third battery 203. The voltage value measured by the second battery 202 is V _{2_2} and the voltage value measured by the third battery 203 is V _{3_2} .

When the first multiplexer 111, the first voltage measuring unit 112, the second multiplexer 121, or the second voltage measuring unit 122 operates, a system measurement error may be caused. Traditionally, such problems can be solved by a corrector. However, for a battery pack containing a plurality of batteries, a plurality of correctors are required; if each of the correctors corresponds to one battery, this undoubtedly increases the overall manufacturing cost. Accordingly, it is a primary feature of the present invention to provide a battery voltage monitoring device that has self-correcting capabilities without relying on multiple correctors, thereby reducing overall manufacturing costs.

To achieve this goal, the first compensation unit 113 and the second compensation unit 123 adjust the voltage values of the batteries 201, 202, and 203 by providing a voltage gain.

The first compensation unit 113 is connected to the first voltage measuring unit 112 for adjusting the voltage values of the first battery 201 and the second battery 202. It is adjusted by multiplying the voltage value measured by the first battery 201 and the second battery 202 by a first compensation value C ₁ . The voltage value of the first battery 201 is adjusted from V _{1_1} to V _{1_1A} , and V _{1_1A is} equivalent to V _{1_1} × C ₁ . The voltage value 201 of the second battery is adjusted from V _{2_1} to V _{2_1A} , and V _{2_1A is} equivalent to V _{2_1} × C ₁ .

Similarly, the second compensation unit 123 is connected to the second voltage measuring unit 122 for adjusting the voltage values of the second battery 202 and the third battery 203. It is adjusted by multiplying the voltage value measured by the second battery 202 and the third battery 203 by a second compensation value C ₂ . The voltage value of the second battery 202 is adjusted from V _{2_2} to V _{2_2A} , and V _{2_2A is} equivalent to V _{2_2} × C ₂ . The third battery voltage value V _{3_2} adjusted from 203 to _V 3_2A, V 3_2A equivalent to V _{3_2} × C _2.

The calculation unit 150 is connected to the first voltage measurement unit 112, the second voltage measurement unit 122, the first compensation unit 113 and the second compensation unit 123. The calculating unit 150 calculates the first compensation value C ₁ and the second by the voltage values (V _{2_1} and V _{2_2} ) of the second battery 202 measured by the first voltage measuring unit 112 and the second voltage measuring unit 122. The compensation value C _{2 is} such that the voltage value of the second battery 202 is adjusted after being adjusted by the first compensation unit 113 and the second compensation unit 123, respectively. That is, the voltage values V _{2_1A} and V _{2_2A} of the second battery after adjustment will be identical. In other words, the first compensation value C _{1 is} multiplied by the voltage value (V _{2_1} ) of the second battery 202 measured by the first voltage measuring unit 112, which is equivalent to the second compensation value C ₂ multiplied by the second voltage measurement. The voltage value (V _{2_2} ) of the second battery 202 measured by the unit 122. Next, the first compensation value C ₁ or the second compensation value C _{2 is selected to be} set to 1. In the present embodiment, the first compensation value C _{1 is} set to 1, so C ₂ = V _{2_1} ÷ V _{2_2} . In other cases, the second compensation value C ₂ may alternatively be set to one.

In order to obtain an accurate battery voltage value of 201, 202 and 203, the battery voltage monitoring device 10 further comprises a voltage reference unit 140 for providing a standard reference voltage V _R to the calculating unit 150.

The standard reference voltage V _R for the series-connected batteries 201, 202 and 203 of an actual battery voltage or one of 201, 202 and 203 in which the actual voltage. For example, if the standard voltage reference V _R is the actual voltage of the first battery 201, the calculation unit 150 calculates by dividing the standard voltage reference V _R by the voltage value of the corresponding adjusted first battery 201. A third compensation value C ₃ . The voltage value of the first battery 201 is V _{1_1A} . That is, C ₃ = V _R ÷ (V _{1_1} × C ₁ ), and since C _{1 is} set to 1, C ₃ = V _R ÷ V _{1_1} . After the calculated C _3, battery voltage values 201, 202 and 203 will be compensated by the first compensation unit 113 and second unit 123 precisely adjusted, so as to achieve the purpose of self-calibration. In detail, the adjusted voltage values of the first battery 201 and the second battery 202 are multiplied by the first compensation value C ₁ and the voltage values (V _{1_1} and V _{2_1} ) measured by the first battery 201 and the second battery 202. The third compensation value C ₃ , and the adjusted voltage value of the third battery 203 is the voltage (V _{3_2} ) measured by the third battery 203 multiplied by the second compensation value C ₂ and the third compensation value C ₃ .

In the present embodiment, the reference voltage unit 140 is contained in the battery voltage monitoring means 10 to provide a standard reference voltage V _R to the computing unit 150, but may use a foreign voltage reference unit providing the standard reference voltage.

The main idea of the present invention is to have the first voltage measuring unit 112 and the second voltage measuring unit 122 measure the same battery regardless of whether the battery is placed between the other two batteries. Therefore, the first battery 201, the second battery 202, and the third battery 203 are not limited to being serially connected in series as in FIG. In other words, even if the second battery 202 is repeatedly measured by the first voltage measuring unit 112 and the second voltage measuring unit 122, the first battery 201 can be placed between the second battery 202 and the third battery 203. That is, although the first battery 201, the second battery 202, and the third battery 203 are serially connected in this embodiment, they are not limited to this configuration sequence.

Traditionally, if a single corrector is used to calibrate multiple batteries, the overall voltage required by the corrector can become very high, and as a result, manufacturing costs will also increase significantly. In this embodiment, each voltage measuring unit only needs to measure two batteries, so that the voltage requirement of each voltage measuring unit is low; thereby reducing the manufacturing cost. It should be understood that the voltage measuring unit is not limited to the same time Only two batteries are measured, and according to the present invention, more than two batteries can be simultaneously measured. For example, when the first voltage measuring unit 112 is simultaneously responsible for measuring four batteries, the second voltage measuring unit 122 will be responsible for measuring the four batteries measured by the first voltage measuring unit 112. One of the three batteries that are not measured by the first voltage measuring unit 112.

With the present invention, the systematic measurement error of each battery can be incorporated into a single variable and, therefore, only needs to be corrected by a standard voltage reference. In addition, when the number of batteries is increased, the purpose of the correction can be achieved by stacking a plurality of voltage measuring units together without increasing the number of voltage reference units or correctors.

Second embodiment

The invention is not limited to measuring a battery pack having only three batteries. It can also be used for battery packs containing more than three batteries. This embodiment will be exemplified by a battery pack having four batteries.

Please refer to Figure 4. The second embodiment is disclosed herein. Components of the same function will use the same component symbols as in the previous examples, and repeated description will not be repeated.

The difference between the first embodiment and the second embodiment is that the battery pack 20 further includes a fourth battery 204, and the battery voltage monitoring device 10 further includes a third multiplexer 131 and a third voltage amount in the second embodiment. The measuring unit 132 and a third compensation unit 133.

The third multiplexer 131 is connected in parallel to the third battery 203 and the fourth battery 204, and alternately receives the voltage of the fourth battery 204 of the third battery 203. The values are output to the third voltage measuring unit 132 in sequence.

After the third voltage measuring unit 132 receives the voltage from the third multiplexer 131 via the channels VSS_3.1, VCC_3.1, VSS_3.2, and VCC_3.2, the third voltage measuring unit 132 will measure the third. The voltage values of the battery 203 and the fourth battery 204. Voltage third battery 203 measured values V _{3_3} and fourth battery 204 measured voltage value V _{4_3.}

As with the battery voltage monitoring device 10 of the first embodiment, a third measurement error may occur when the third multiplexer 131 and the third voltage measuring unit 132 operate.

To overcome this problem, the third compensation unit 133 adjusts the voltage values of the batteries 203 and 204 by providing a voltage gain.

The third compensation unit 133 is connected to the third voltage measuring unit 132 for adjusting the voltage values of the third battery 203 and the fourth battery 204. The adjusted voltage value is multiplied by a fourth compensation value C ₄ by the voltage value measured by the third battery 203 and the fourth battery 204. That is, the voltage value of the third battery 203 is adjusted from V _{3_3} to V _{3_3A} , and V _{3_3A is} equivalent to V _{3_3} × C ₄ . The fourth battery voltage value V _{4_3} adjusted from 204 to _V 4_3A, V 4_3A equivalent to V _{4_3} × C _4.

In this embodiment, the computing unit 150 is connected to the first voltage measuring unit 112, the second voltage measuring unit 122, the third voltage measuring unit 132, the first compensation unit 113, the second compensation unit 123, and the third Compensation unit 133. The calculation unit 150 is used not only to calculate the first compensation value C ₁ , the second compensation value C ₂ and the third compensation value C ₃ , but also by the second voltage measurement unit 122 and the third voltage measurement unit 132 The voltage value (V _{3_2} and V _{3_3} ) of the third battery 203 is measured to calculate a fourth compensation value C ₄ . In other words, after the voltage value of the third battery 203 is adjusted by the second compensation unit 123 and the third compensation unit 133, the two will be identical. Which means, the adjusted third battery 203 and the voltage value _V 3_2A _V 3_3A will be the same. That is, the second compensation value C _{2 is} multiplied by the voltage value (V _{3_2} ) of the third battery 203 measured by the second voltage measuring unit 122, which is equal to the fourth compensation value C ₄ multiplied by the third voltage measuring unit. 132 a third measured battery voltage value of 203 (V _{3_3).} Second, select C ₁ , C ₂ or C _{3 to} be 1. In the present embodiment, C ₁ is selected to be 1, so C ₂ = V _{2_1} ÷ V _{2_2} and C ₄ is calculated by the following formula: V _{3_3} × C ₄ = V _{3_2} × C ₂ = V _{3_2} × (V _{2_1} ÷V _{2_2} )

C ₄ =[V _{3_2} ×(V _{2_1} ÷V _{2_2} )]÷V _{3_3}

As in the first embodiment mentioned above, in order to obtain an accurate battery voltage value, the battery voltage monitoring apparatus 10 further includes a voltage reference unit 140 for providing a standard reference voltage V _R to the computing unit 150. If the standard voltage reference V _R is an actual voltage of the first battery 201, the calculation unit 150 calculates a third compensation value by dividing the standard voltage reference V _R by the corresponding adjusted first battery 201 voltage value. C ₃ , the first battery 201 is V _{1_1A} . That is, C ₃ = V _R ÷ (V _{1_1} × C ₁ ), and since C _{1 is} set to 1, C ₃ = V _R ÷ V _{1_1} . After the calculated C _3, battery voltage value 201, 202 and 203 as in the first embodiment can be said embodiment, it is precisely adjusted, and the battery voltage value 204 may be a voltage value by measuring the fourth battery 204 (V _{4_3} ) is multiplied by the third compensation value C ₃ and the fourth compensation value C ₄ to be accurately adjusted, so that self-correction can be achieved.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art does not deviate. In the spirit and scope of the present invention, the scope of the present invention is defined by the scope of the appended claims.

10‧‧‧Battery voltage monitoring device

111‧‧‧First multiplexer

112‧‧‧First voltage measuring unit

113‧‧‧First compensation unit

121‧‧‧Second multiplexer

122‧‧‧Second voltage measuring unit

123‧‧‧Second compensation unit

131‧‧‧ third multiplexer

132‧‧‧ Third voltage measuring unit

133‧‧‧ Third compensation unit

140‧‧‧Voltage Reference Unit

150‧‧‧Computation unit

20‧‧‧Battery Pack

201‧‧‧First battery

202‧‧‧Second battery

203‧‧‧ third battery

204‧‧‧fourth battery

Figure 1 shows a conventional charge and discharge supply system.

Figure 2 shows a conventional measurement battery voltage device.

Figure 3 illustrates a first embodiment of the present invention.

Figure 4 illustrates a second embodiment of the present invention.

10‧‧‧Battery voltage monitoring device

111‧‧‧First multiplexer

112‧‧‧First voltage measuring unit

113‧‧‧First compensation unit

121‧‧‧Second multiplexer

122‧‧‧Second voltage measuring unit

123‧‧‧Second compensation unit

140‧‧‧Voltage Reference Unit

150‧‧‧Computation unit

20‧‧‧Battery Pack

201‧‧‧First battery

202‧‧‧Second battery

203‧‧‧ third battery

Claims (11)

A battery voltage monitoring and self-correcting device for a plurality of batteries, comprising: a first voltage measuring unit for measuring a voltage value of a first battery and a second battery; and a second voltage measuring unit, For measuring the voltage values of the second battery and the third battery; a first compensation unit is connected to the first voltage measuring unit, and the voltage measured by the first battery and the second battery Multiplying the value by a first compensation value to adjust the voltage values of the first battery and the second battery; a second compensation unit is connected to the second voltage measuring unit, by using the second battery and the third The voltage value measured by the battery is multiplied by a second compensation value to adjust the voltage values of the second battery and the third battery; a computing unit is connected to the first voltage measuring unit and the second voltage measuring unit The first compensation unit and the second compensation unit calculate the first compensation value by using the voltage values of the second battery measured by the first voltage measuring unit and the second voltage measuring unit. The second compensation value is such that the voltage value of the second battery Adjusted by the first compensation unit and the second compensation unit respectively to be consistent, so that the systematic measurement error of each battery can be incorporated into a single variable for self-correction; and a voltage reference unit for Providing a standard voltage reference to the computing unit, wherein the standard voltage reference is an actual voltage value of the plurality of series connected batteries or an actual voltage value of one of the batteries, The calculation unit calculates a third compensation value by dividing the standard voltage reference by the corresponding adjustment voltage value. The battery voltage monitoring and self-correcting device of claim 1, wherein the first, second, and third batteries are serially connected in series. The battery voltage monitoring and self-correcting device according to claim 1, wherein the first compensation value or the second compensation value is set to 1. The battery voltage monitoring and self-correcting device according to claim 1, wherein the voltage values of the first and second batteries are multiplied by the first and second battery voltage values. The compensation value and the third compensation value are adjusted, and the third battery voltage value is adjusted by multiplying the voltage value measured by the third battery by the second compensation value and the third compensation value, thereby Achieve self-correction purposes. The battery voltage monitoring and self-correcting device of claim 1, further comprising a first multiplexer for mutually receiving voltage values of the first battery and the second battery, and responsive to the voltage value And outputting to the first voltage measuring unit; and a second multiplexer for mutually receiving the voltage values of the second battery and the third battery, and sequentially outputting the voltage value to the second voltage amount Measurement unit. The battery voltage monitoring and self-correcting device according to claim 1, wherein the voltage value of the second battery measured by the first voltage measuring unit is multiplied by the first compensation value, which is equivalent to The voltage value of the second battery measured by the second voltage measuring unit is multiplied by the second compensation value. Battery voltage monitoring and self as described in item 1 of the patent application scope The calibration device, wherein the battery is a rechargeable battery and/or a lithium battery. The battery voltage monitoring and self-correcting device of claim 1, wherein the first voltage measuring unit and/or the second voltage measuring unit can simultaneously measure voltage values of more than two batteries. A battery voltage monitoring and self-correcting device comprises: at least two voltage measuring units for measuring voltage values of a plurality of batteries, wherein at least one battery is measured by two voltage measuring units; at least two The compensation unit is connected to a voltage measuring unit, and the voltage value of the battery is adjusted by multiplying the voltage value measured by the battery by a first compensation value; a calculating unit is connected to the voltage measuring unit and The compensation unit calculates the first compensation value by using the voltage value of the battery measured by the two voltage measuring units, so that the voltage value of the battery is adjusted after being adjusted by the two compensation units respectively, thereby Having a systematic measurement error of each battery incorporated into a single variable for self-correction; and a voltage reference unit for providing a standard voltage reference to the computing unit, wherein the standard voltage reference is the plurality of An actual voltage value of the series battery or an actual voltage value of one of the batteries, wherein the calculation unit divides the standard voltage reference by a corresponding adjusted voltage value Calculating a second compensation value. The battery voltage monitoring and self-correcting device according to claim 9, wherein the voltage value of the battery is obtained by multiplying the voltage value measured by the battery by the first compensation value and the second compensation value. Adjustment from And achieve the purpose of self-correction. The battery voltage monitoring and self-correcting device according to claim 9, further comprising at least one multiplexer for mutually receiving a voltage value of the battery and outputting the voltage value to the voltage measuring unit.