Hook meter system with battery internal resistance measuring function

Abstract

The invention discloses a hook meter system with a battery internal resistance measuring function. The hook meter system comprises a first processing unit, an analog-to-digital conversion circuit, a current measuring circuit, a direct current sensor, a voltage attenuation network and a voltage probe group, the first processing unit utilizes the analog-to-digital conversion circuit, the current measuring circuit, the direct current sensor, the voltage attenuation network and the voltage probe group to measure a battery current and a battery total voltage of a plurality of batteries so as to obtain a second digital current signal and a second digital voltage signal. Subtracting the second digital voltage signal from a first digital voltage signal to obtain a voltage difference; subtracting a first digital current signal from the second digital current signal to obtain a current difference; the voltage difference is divided by the current difference to obtain an overall internal resistance value of each battery. Therefore, the hook meter system with the battery internal resistance measuring function is obtained, so that the internal resistance of the battery can be measured more easily.

Description

Technical Field

[0001] The invention relates to a hook meter system, in particular to a hook meter system with a battery internal resistance measurement function. Background Art

[0002] The internal resistance of the battery is an important basis for evaluating whether the battery is aging; once the battery is seriously aged, it must be replaced with a new battery to avoid affecting the energy storage effect. In addition to the fact that the internal resistance of the battery will slowly increase with the increase of usage time, the internal resistance of the battery is not a constant; during the charging and discharging process, the internal resistance of the battery will continue to change over time, because the composition of the active material, the concentration of the electrolyte and the temperature are constantly changing.

[0003] Although the internal resistance of a battery is an important basis for evaluating whether the battery is aging, the current methods for measuring the internal resistance of a battery are very complicated, which is a pity. Summary of the invention

[0004] To solve the above problems, the object of the present invention is to provide a hook meter system with a battery internal resistance measurement function.

[0005] To achieve the above-mentioned purpose of the present invention, the hook meter system with battery internal resistance measurement function of the present invention is applied to a plurality of batteries, each of the batteries is connected in series and electrically connected to the hook meter system with battery internal resistance measurement function, and the hook meter system with battery internal resistance measurement function comprises: a first processing unit; an analog-to-digital conversion circuit, the analog-to-digital conversion circuit is electrically connected to the first processing unit; a current measurement circuit, the current measurement circuit is electrically connected to the analog-to-digital conversion circuit; a DC current sensor, the DC current sensor is electrically connected to the current measurement circuit; a voltage attenuation network, the voltage attenuation network is electrically connected to the analog-to-digital conversion circuit; and a voltage probe set, the voltage probe The group is electrically connected to the voltage attenuation network and each of the batteries, wherein the first processing unit is configured to utilize the analog-to-digital conversion circuit, the current measurement circuit, the DC current sensor, the voltage attenuation network and the voltage probe group to measure a battery current and a total battery voltage of each of the batteries to obtain a second digital current signal and a second digital voltage signal; the first processing unit is configured to subtract the second digital voltage signal from the first digital voltage signal to obtain a voltage difference; the first processing unit is configured to subtract the first digital current signal from the second digital current signal to obtain a current difference; the first processing unit is configured to divide the voltage difference by the current difference to obtain an overall internal resistance value of each of the batteries.

[0006] Furthermore, in one specific embodiment of the hook meter system with a battery internal resistance measurement function of the present invention as described above, the hook meter system with a battery internal resistance measurement function further includes: a first display, the first display is electrically connected to the first processing unit, wherein the first processing unit is configured to transmit the overall internal resistance value of each of the batteries to the first display to display the overall internal resistance value of each of the batteries; at a first time point, the first processing unit is configured to use the analog-to-digital conversion circuit, the voltage attenuation network and the voltage probe group to measure the total battery voltage of each of the batteries to obtain the first digital voltage signal; the first processing unit sets the first digital current signal to zero; at a second time point, the first processing unit is configured to use the analog-to-digital conversion circuit, the current measurement circuit, the DC current sensor, the voltage attenuation network and the voltage probe group to measure the battery current and the total battery voltage of each of the batteries to obtain the second digital current signal and the second digital voltage signal.

[0007] Furthermore, in one specific embodiment of the hook meter system with battery internal resistance measurement function of the present invention as described above, the hook meter system with battery internal resistance measurement function further includes: a first wireless communication transceiver circuit, which is electrically connected to the first processing unit.

[0008] Furthermore, in one specific embodiment of the hook meter system with battery internal resistance measurement function of the present invention as described above, the hook meter system with battery internal resistance measurement function further includes: a second wireless communication transceiver circuit, which is wirelessly connected to the first wireless communication transceiver circuit.

[0009] Furthermore, in one specific embodiment of the hook meter system with a battery internal resistance measurement function of the present invention as described above, the hook meter system with a battery internal resistance measurement function further includes: a second processing unit, the second processing unit is electrically connected to the second wireless communication transceiver circuit, wherein the first processing unit is configured to transmit the overall internal resistance value of each of the batteries to the second processing unit via the first wireless communication transceiver circuit and the second wireless communication transceiver circuit; the second processing unit is configured to compare the overall internal resistance value of each of the batteries with an overall internal resistance threshold; when the overall internal resistance value of each of the batteries is greater than the overall internal resistance threshold, the hook meter system with a battery internal resistance measurement function is configured to execute an individual battery internal resistance measurement procedure for each of the batteries to measure an internal resistance value of each of the batteries.

[0010] Furthermore, in one specific embodiment of the hook meter system with battery internal resistance measurement function of the present invention as described above, the hook meter system with battery internal resistance measurement function further includes: a second display, the second display is electrically connected to the second processing unit, wherein the second processing unit is configured to transmit the overall internal resistance value of each of the batteries to the second display to display the overall internal resistance value of each of the batteries.

[0011] Furthermore, in one specific embodiment of the hook meter system with battery internal resistance measurement function of the present invention as described above, the analog-to-digital conversion circuit is a fast high-resolution analog-to-digital converter to switch the current measurement circuit and the voltage attenuation network, or the analog-to-digital conversion circuit includes a plurality of analog-to-digital converters to be electrically connected to the current measurement circuit and the voltage attenuation network respectively.

[0012] Furthermore, in one specific embodiment of the hook meter system with battery internal resistance measurement function of the present invention as described above, the current measurement circuit is an ammeter; and the voltage attenuation network is an attenuator.

[0013] Furthermore, in one specific embodiment of the hook meter system with battery internal resistance measurement function of the present invention as described above, the first wireless communication transceiver circuit is a Bluetooth wireless communication circuit; the second wireless communication transceiver circuit is a Bluetooth wireless communication circuit.

[0014] Furthermore, in one specific embodiment of the hook meter system with battery internal resistance measurement function of the present invention as described above, the first processing unit is a microprocessor or a microcontroller; the second processing unit is a microprocessor or a microcontroller.

[0015] The present invention is effective in easily measuring the internal resistance of a battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a block diagram of a first embodiment of a hook meter system with a battery internal resistance measurement function according to the present invention.

[0017] Figure 2 It is a schematic diagram of calculating the internal resistance of a battery according to the present invention.

[0018] Figure 3 FIG. 4 is an application block diagram of an embodiment of a portable hook meter of the present invention.

[0019] Figure 4 FIG. 4 is a block diagram of a second embodiment of the hook meter system with a battery internal resistance measurement function of the present invention.

[0020] In the figure: 10: hook meter system with battery internal resistance measurement function; 20: battery; 22: battery current; 22-1: individual battery current; 24: total battery voltage; 24-1: individual battery voltage; 26: overall internal resistance; 28: internal resistance; 30: load; 102: first processing unit; 104: analog-to-digital conversion circuit; 106: current measurement circuit; 108: voltage attenuation network; 110: voltage probe group; 112: first display; 114: first wireless communication transceiver circuit; 116: second wireless communication transceiver circuit; 118: second processing unit; 120: second display; 122: overall internal resistance threshold; 122-1: internal resistance threshold; 124: first probe; 126: second probe; 127: DC current sensor; 128: portable hook meter; 130: DC to AC inverter; 202: battery element; 204: battery internal resistance; 206: capacitance; I1: first digital current signal; I2: second digital current signal; I3: current difference; I5: second analog current signal; I11: first individual digital current signal; I21: second individual digital current signal; I31: individual current difference; I51: second individual analog current signal; V1: first digital voltage signal; V2: second digital voltage signal; V3: voltage difference; V4: first analog voltage signal; V5: second analog voltage signal; V11: first individual digital voltage signal; V21: second individual digital voltage signal; V31: individual voltage difference; V41: first individual analog voltage signal; V51: The second analog voltage signal. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. In the following embodiments, many specific details are provided to provide a thorough understanding of the specific embodiments of the present invention; however, those skilled in the art should know that the present invention can still be practiced without one or more of the specific details; in other cases, well-known details are not shown or described to avoid obscuring the main technical features of the present invention. The technical content and detailed description of the present invention are described as follows in conjunction with the accompanying drawings: Please refer to Figure 1, which is a block diagram of a first embodiment of a hook meter system 10 with a battery internal resistance measurement function of the present invention. The hook meter system 10 with a battery internal resistance measurement function is applied to a plurality of batteries 20, each of which is connected in series and electrically connected to the hook meter system 10 with a battery internal resistance measurement function. The hook meter system 10 with a battery internal resistance measurement function includes a first processing unit 102, an analog-to-digital conversion circuit 104, a current measurement circuit 106, a voltage attenuation network 108, a voltage probe set 110, a first display 112, a first wireless communication transceiver circuit 114, a second wireless communication transceiver circuit 116, a second processing unit 118, a second display 120 and a DC current sensor 127. Although Figure 1 Only three batteries 20 are shown, but the present invention is not limited thereto. For example, the present invention may include thirty batteries 20 or even more batteries 20. The DC current sensor 127 is hooked to the load current loop line of each battery 20.

[0022] Each of the batteries 20, the first processing unit 102, the analog-to-digital conversion circuit 104, the current measurement circuit 106, the voltage attenuation network 108, the voltage probe set 110, the first display 112, the first wireless communication transceiver circuit 114, and the DC current sensor 127 are electrically connected to each other, the second wireless communication transceiver circuit 116 is wirelessly connected to the first wireless communication transceiver circuit 114, the second wireless communication transceiver circuit 116, the second processing unit 118, and the second display 120 are electrically connected to each other. The voltage probe set 110 includes a first probe 124 and a second probe 126; the first probe 124 is connected to Figure 1 The top of each battery 20 is shown, and the second probe 126 is connected to Figure 1 The batteries 20 are shown at the bottom.

[0023] The battery 20 may be, for example, but the present invention is not limited to a lithium battery; the analog-to-digital conversion circuit 104 may be, for example, but the present invention is not limited to a fast high-resolution analog-to-digital converter to switch the current measurement circuit 106 and the voltage attenuation network 108, or the analog-to-digital conversion circuit 104 includes a plurality of analog-to-digital converters to be electrically connected to the current measurement circuit 106 and the voltage attenuation network 108 respectively; the current measurement circuit 106 may be, for example, but the present invention is not limited to an ammeter; the voltage attenuation network 108 may be For example, but the present invention is not limited to an attenuator; the first wireless communication transceiver circuit 114 can be, for example, but the present invention is not limited to a Bluetooth wireless communication circuit; the second wireless communication transceiver circuit 116 can be, for example, but the present invention is not limited to a Bluetooth wireless communication circuit; the first processing unit 102 can be, for example, but the present invention is not limited to a microprocessor or a microcontroller, which at least has control, calculation and recording functions; the second processing unit 118 can be, for example, but the present invention is not limited to a microprocessor or a microcontroller, which at least has control, calculation and recording functions.

[0024] The first processing unit 102 is configured to utilize the analog-to-digital conversion circuit 104, the current measurement circuit 106, the DC current sensor 127, the voltage attenuation network 108, and the voltage probe set 110 to measure a battery current 22 and a total battery voltage 24 of each of the batteries 20 to obtain a second digital current signal I2 and a second digital voltage signal V2; the first processing unit 102 is configured to subtract the second digital voltage signal V2 from a first digital voltage signal V1 to obtain a voltage difference V3; the first processing unit 102 is configured to subtract the first digital current signal I1 from the second digital current signal I2 to obtain a current difference I3; the first processing unit 102 is configured to divide the voltage difference V3 by the current difference I3 to obtain an overall internal resistance value 26 of each of the batteries. At a first time point, the first processing unit 102 is configured to use the analog-to-digital conversion circuit 104, the voltage attenuation network 108 and the voltage probe group 110 to measure the total battery voltage 24 of each of the batteries 20 to obtain the first digital voltage signal V1; the first processing unit 102 sets the first digital current signal I1 to zero; in more detail, at the first time point, the voltage attenuation network 108 and the voltage probe group 110 measure the total battery voltage 24 of each of the batteries 20 to obtain a first analog voltage signal V4 and transmit the first analog voltage signal V4 to the analog-to-digital conversion circuit 104, and then the analog-to-digital conversion circuit 104 converts the first analog voltage signal V4 into the first digital voltage signal V1 and transmits the first digital voltage signal V1 to the first processing unit 102. At the first time point, each of the batteries 20 may be, for example, but the present invention is not limited to, light load or no load (that is, please refer to Figure 2, the battery 20 supplies power to a load 30, and the power consumption of the load 30 makes the battery 20 lightly loaded or unloaded).

[0025] Next, at a second time point after the first time point, the first processing unit 102 is configured to utilize the analog-to-digital conversion circuit 104, the current measurement circuit 106, the DC current sensor 127, the voltage attenuation network 108, and the voltage probe set 110 to measure the battery current 22 of each of the batteries 20 and the total battery voltage 24 to obtain the second digital current signal I2 and the second digital voltage signal V2. More specifically, at the second time point, the DC current sensor 127 and the current measurement circuit 106 measure the battery current 22 of each of the batteries 20 to obtain a second analog current signal I5 The second analog current signal I5 is transmitted to the analog-to-digital conversion circuit 104, and the voltage attenuation network 108 and the voltage probe group 110 measure the total battery voltage 24 of each battery 20 to obtain a second analog voltage signal V5 and transmit the second analog voltage signal V5 to the analog-to-digital conversion circuit 104. Then, the analog-to-digital conversion circuit 104 converts the second analog current signal I5 and the second analog voltage signal V5 into the second digital current signal I2 and the second digital voltage signal V2 and transmits the second digital current signal I2 and the second digital voltage signal V2 to the first processing unit 102. At the second time point, each battery 20 may be, for example, but the present invention is not limited to being overloaded (that is, please refer to Figure 2 , the battery 20 supplies power to the load 30, and the power consumption of the load 30 makes the battery 20 overloaded).

[0026] The first processing unit 102 is configured to subtract the second digital voltage signal V2 from the first digital voltage signal V1 to obtain the voltage difference V3; the first processing unit 102 is configured to subtract the first digital current signal I1 from the second digital current signal I2 to obtain the current difference I3; the first processing unit 102 is configured to divide the voltage difference V3 by the current difference I3 to obtain the overall internal resistance value 26 of each battery 20. That is, from the perspective of mathematical formula: (the first digital voltage signal V1-the second digital voltage signal V2) / (the second digital current signal I2-the first digital current signal I1)=the voltage difference V3 / the current difference I3=the overall internal resistance value 26; the following Figure 2 The origin of the above mathematical formula will be described.

[0027] Please refer to Figure 2 , which is a schematic diagram of calculating the internal resistance of a battery according to the present invention; to make the calculation of the overall internal resistance 26 easier to understand: Figure 2 Only one battery 20 is shown, and the components in the hook meter system 10 with battery internal resistance measurement function are ignored. Figure 2 The measured voltage and current are analog signals, but Figure 2 The aforementioned digital signals are still used for convenience of explanation. The equivalent circuit of the battery 20 includes a battery element 202, a battery internal resistor 204 and a capacitor 206. The battery 20 is connected to a load 30. Figure 2 It can be known that: the first digital voltage signal V1+the first digital current signal I1*the internal resistance value of the battery internal resistor 204=the second digital voltage signal V2+the second digital current signal I2*the internal resistance value of the battery internal resistor 204. Then, the first digital voltage signal V1-the second digital voltage signal V2=the second digital current signal I2*the internal resistance value of the battery internal resistor 204-the first digital current signal I1*the internal resistance value of the battery internal resistor 204=(the second digital current signal I2-the first digital current signal I1)*the internal resistance value of the battery internal resistor 204. Finally, (the first digital voltage signal V1-the second digital voltage signal V2) / (the second digital current signal I2-the first digital current signal I1)=the internal resistance value of the battery internal resistor 204. In this way, the battery internal resistance value is calculated.

[0028] Please refer to Figure 3 , which is an application block diagram of an embodiment of a portable hook meter 128 of the present invention, and please also refer to Figure 1 . Figure 1 The first processing unit 102, the analog-to-digital conversion circuit 104, the current measurement circuit 106, the voltage attenuation network 108, the voltage probe set 110, the first display 112, the first wireless communication transceiver circuit 114 and the DC current sensor 127 form Figure 3 The portable hook meter 128 is shown. The portable hook meter 128 is applied to a DC to AC inverter 130 and a load 30.

[0029] Please refer to Figure 1The first processing unit 102 is configured to transmit the overall internal resistance value 26 of each of the batteries 20 to the first display 112 to display the overall internal resistance value 26 of each of the batteries 20 . The first processing unit 102 is configured to transmit the overall internal resistance value 26 of each of the batteries 20 to the second processing unit 118 via the first wireless communication transceiver circuit 114 and the second wireless communication transceiver circuit 116; the second processing unit 118 is configured to compare the overall internal resistance value 26 of each of the batteries 20 with an overall internal resistance threshold 122 (which may be, for example, but the present invention is not limited to being provided by the manufacturer of each of the batteries 20); when the overall internal resistance value 26 of each of the batteries 20 is greater than the overall internal resistance threshold 122 (which means that at least one of the batteries 20 is seriously aged), the hook meter system 10 with battery internal resistance measurement function is configured to perform an individual battery internal resistance measurement procedure on each of the batteries 20 to measure an internal resistance value 28 of each of the batteries 20 (so as to find out the battery 20 that is seriously aged, which will be described in detail later). Figure 4 ). The second processing unit 118 is configured to transmit the overall internal resistance value 26 of each battery 20 to the second display 120 to display the overall internal resistance value 26 of each battery 20; the present invention can also draw a plurality of overall internal resistance values ​​26 into a graph to observe the change of each overall internal resistance value 26. Furthermore, the wireless transmission and reception of signals between the first wireless communication transceiver circuit 114 and the second wireless communication transceiver circuit 116 belongs to the conventional technology, so it is not repeated here.

[0030] Furthermore, please refer to Figure 4 , which is a block diagram of a second embodiment of the hook meter system 10 with a battery internal resistance measurement function of the present invention; Figure 4 The components shown are Figure 1 The same components are shown in the figure, and for the sake of simplicity, their description will not be repeated here; the first probe 124 is connected to Figure 4 The second probe 126 is connected to the upper portion of the first battery 20 from top to bottom. Figure 4 The lower part of the first battery 20 from the top to the bottom of each of the batteries 20 shown. As mentioned above, when the overall internal resistance value 26 of each of the batteries 20 is greater than the overall internal resistance threshold value 122 (this means that at least one of the batteries 20 is seriously aged), the hook meter system 10 with battery internal resistance measurement function is configured to perform the individual battery internal resistance measurement procedure on each of the batteries 20 to measure the internal resistance value 28 of each of the batteries 20 (so as to find the battery 20 that is seriously aged), as described in detail as follows: At a third time point, the first processing unit 102 is configured to use the analog-to-digital conversion circuit 104, the voltage attenuation network 108, and the voltage probe set 110 to measure one of the batteries 20 (eg, Figure 4 As shown, from top to bottom, the individual battery voltage 24-1 of the first battery 20) is measured to obtain a first individual digital voltage signal V11; the first processing unit 102 sets a first individual digital current signal I11 to zero; in more detail, at the third time point, the voltage attenuation network 108 and the voltage probe set 110 measure one of the batteries 20 (that is, Figure 4 The individual battery voltage 24-1 of the first battery 20 shown from top to bottom is obtained to obtain a first individual analog voltage signal V41 and transmit the first individual analog voltage signal V41 to the analog-to-digital conversion circuit 104, and then the analog-to-digital conversion circuit 104 converts the first individual analog voltage signal V41 into the first individual digital voltage signal V11 and transmits the first individual digital voltage signal V11 to the first processing unit 102. At the third time point, each of the batteries 20 may be, for example, but the present invention is not limited to, lightly loaded or unloaded (i.e., please refer to Figure 2 , the battery 20 supplies power to a load 30, and the power consumption of the load 30 makes the battery 20 lightly loaded or unloaded).

[0031] Next, at a fourth time point after the third time point, the first processing unit 102 is configured to utilize the analog-to-digital conversion circuit 104, the current measurement circuit 106, the DC current sensor 127, the voltage attenuation network 108, and the voltage probe set 110 to measure one of the batteries 20 (i.e., Figure 4 1 and 106. In the fourth time point, the DC current sensor 127 and the current measurement circuit 106 measure one of the batteries 20 (i.e., Figure 4 The individual battery current 22-1 of the first battery 20 shown from top to bottom is used to obtain a second individual analog current signal I51 and transmit the second individual analog current signal I51 to the analog-to-digital conversion circuit 104, and the voltage attenuation network 108 and the voltage probe set 110 measure one of the batteries 20 (that is, Figure 4The individual battery voltage 24-1 of the first battery 20 shown from top to bottom is used to obtain a second individual analog voltage signal V51 and transmit the second individual analog voltage signal V51 to the analog-to-digital conversion circuit 104. Then, the analog-to-digital conversion circuit 104 converts the second individual analog current signal I51 and the second individual analog voltage signal V51 into the second individual digital current signal I21 and the second individual digital voltage signal V21 and transmits the second individual digital current signal I21 and the second individual digital voltage signal V21 to the first processing unit 102. At the fourth time point, each of the batteries 20 may be, for example, but the present invention is not limited to being overloaded (i.e., please refer to Figure 2 , the battery 20 supplies power to the load 30, and the power consumption of the load 30 makes the battery 20 overloaded).

[0032] The first processing unit 102 is configured to subtract the second individual digital voltage signal V21 from the first individual digital voltage signal V11 to obtain an individual voltage difference V31; the first processing unit 102 is configured to subtract the first individual digital current signal I11 from the second individual digital current signal I21 to obtain an individual current difference I31; the first processing unit 102 is configured to divide the individual voltage difference V31 by the individual current difference I31 to obtain one of the batteries 20 (i.e., Figure 4 The internal resistance value 28 of the first battery 20 is shown from top to bottom. That is, from the perspective of a mathematical formula: (the first individual digital voltage signal V11-the second individual digital voltage signal V21) / (the second individual digital current signal I21-the first individual digital current signal I11)=the individual voltage difference V31 / the individual current difference I31=the internal resistance value 28.

[0033] The first processing unit 102 is configured to transmit the internal resistance value 28 to the first display 112 to display the internal resistance value 28. The first processing unit 102 is configured to transmit the internal resistance value 28 to the second processing unit 118 via the first wireless communication transceiver circuit 114 and the second wireless communication transceiver circuit 116; the second processing unit 118 is configured to compare the internal resistance value 28 with an internal resistance threshold 122-1 (which may be, for example, but the present invention is not limited to, provided by the manufacturer of each of the batteries 20); when the internal resistance value 28 is greater than the internal resistance threshold 122-1, the second processing unit 118 is configured to determine that the battery 20 (that is, Figure 4 The first battery 20 shown from top to bottom is seriously aged. The second processing unit 118 is configured to transmit the internal resistance value 28 to the second display 120 to display the internal resistance value 28. Figure 4After the internal resistance value 28 of the first battery 20 from top to bottom is shown, the present invention can measure and determine the remaining batteries 20. Furthermore, the wireless transmission and reception of signals between the first wireless communication transceiver circuit 114 and the second wireless communication transceiver circuit 116 belongs to the conventional technology, so it will not be repeated here.

[0034] The present invention is effective in easily measuring the internal resistance of a battery.

[0035] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. A hook meter system with a battery internal resistance measurement function, applied to a plurality of batteries, each of which is connected in series and electrically connected to the hook meter system with a battery internal resistance measurement function, characterized in that: The hook meter system with battery internal resistance measurement function includes: a first processing unit; an analog-to-digital conversion circuit, the analog-to-digital conversion circuit being electrically connected to the first processing unit; a current measurement circuit electrically connected to the analog-to-digital conversion circuit; a DC current sensor electrically connected to the current measurement circuit; a voltage attenuation network electrically connected to the analog-to-digital conversion circuit; and a voltage probe set, the voltage probe set is electrically connected to the voltage decay network and each of the batteries, Wherein, the first processing unit is configured to utilize the analog-to-digital conversion circuit, the current measurement circuit, the DC current sensor, the voltage attenuation network and the voltage probe group to measure a battery current and a total battery voltage of each of the batteries to obtain a second digital current signal and a second digital voltage signal; the first processing unit is configured to subtract the second digital voltage signal from the first digital voltage signal to obtain a voltage difference; the first processing unit is configured to subtract the first digital current signal from the second digital current signal to obtain a current difference; the first processing unit is configured to divide the voltage difference by the current difference to obtain an overall internal resistance value of each of the batteries.

2. The hook meter system with battery internal resistance measurement function as claimed in claim 1, characterized in that: Further including: a first display electrically connected to the first processing unit, Wherein, the first processing unit is configured to transmit the overall internal resistance value of each of the batteries to the first display to display the overall internal resistance value of each of the batteries; at a first time point, the first processing unit is configured to use the analog-to-digital conversion circuit, the voltage attenuation network and the voltage probe group to measure the total battery voltage of each of the batteries to obtain the first digital voltage signal; the first processing unit sets the first digital current signal to zero; at a second time point, the first processing unit is configured to use the analog-to-digital conversion circuit, the current measurement circuit, the DC current sensor, the voltage attenuation network and the voltage probe group to measure the battery current and the total battery voltage of each of the batteries to obtain the second digital current signal and the second digital voltage signal.

3. The hook meter system with battery internal resistance measurement function as claimed in claim 2, characterized in that: Further including: A first wireless communication transceiver circuit is electrically connected to the first processing unit.

4. The hook meter system with battery internal resistance measurement function as claimed in claim 3, characterized in that: Further including: A second wireless communication transceiver circuit is wirelessly connected to the first wireless communication transceiver circuit.

5. The hook meter system with battery internal resistance measurement function as claimed in claim 4, characterized in that: Further including: A second processing unit, the second processing unit is electrically connected to the second wireless communication transceiver circuit, wherein the first processing unit is configured to transmit the overall internal resistance value of each of the batteries to the second processing unit via the first wireless communication transceiver circuit and the second wireless communication transceiver circuit; the second processing unit is configured to compare the overall internal resistance value of each of the batteries with an overall internal resistance threshold; when the overall internal resistance value of each of the batteries is greater than the overall internal resistance threshold, the hook meter system with battery internal resistance measurement function is configured to execute an individual battery internal resistance measurement procedure for each of the batteries to measure an internal resistance value of each of the batteries.

6. The hook meter system with battery internal resistance measurement function as claimed in claim 5, characterized in that: Further including: a second display electrically connected to the second processing unit, The second processing unit is configured to transmit the overall internal resistance value of each of the batteries to the second display to display the overall internal resistance value of each of the batteries.

7. The hook meter system with battery internal resistance measurement function as claimed in claim 6, characterized in that: The analog-to-digital conversion circuit is a fast high-resolution analog-to-digital converter to switch the current measurement circuit and the voltage attenuation network, or the analog-to-digital conversion circuit includes a plurality of analog-to-digital converters to be electrically connected to the current measurement circuit and the voltage attenuation network respectively.

8. The hook meter system with battery internal resistance measurement function as claimed in claim 7, characterized in that: The current measuring circuit is an ammeter; the voltage attenuation network is an attenuator.

9. The hook meter system with battery internal resistance measurement function as claimed in claim 8, characterized in that: The first wireless communication transceiver circuit is a Bluetooth wireless communication circuit; the second wireless communication transceiver circuit is a Bluetooth wireless communication circuit.

10. The hook meter system with battery internal resistance measurement function as claimed in claim 9, characterized in that: The first processing unit is a microprocessor or a microcontroller; the second processing unit is a microprocessor or a microcontroller.

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