Battery state measuring method

Abstract

A battery state measuring method comprises the following steps: a voltage detection circuit is connected to a motor and a battery; the battery provides a starting voltage to the motor to start the motor; the voltage detection circuit detects the starting voltage to obtain a minimum starting voltage value; the voltage detection circuit transmits the lowest starting voltage value to a comparison unit; the comparison unit is used for comparing the minimum starting voltage value with a starting voltage threshold value to obtain a battery state signal; the comparison unit transmits the battery state signal to a display; the display displays the battery state signal. Therefore, the service life health state of the battery of the load device can be simply measured.

Description

Technical Field

[0001] The present invention relates to a measurement method, and in particular to a battery status measurement method. Background Art

[0002] The car battery (or storage battery) is used to start and supply power to the car's engine starter motor, so the car battery is very important. After long-term use, the internal resistance of the car battery will increase, causing the car battery to gradually age and affect the ability to start and supply power to the car's engine starter motor; therefore, it is very important to measure the life health of the car battery.

[0003] There are many methods for measuring the life health status of a car battery, but these methods all require the car battery to be removed from the fixed end of the power connector of the car's engine starter motor, which is very inconvenient.

[0004] Generally speaking, the specifications of lead-acid batteries for fuel vehicles are as follows: 1.Battery voltage: 12 volts or 24 volts.

[0005] 2. Battery capacity (AH): The time required to discharge at rated current until the battery voltage reaches the calibrated minimum voltage is the battery capacity (AH).

[0006] 3. Cold cranking current CCA (cold cranking amps): The maximum cranking current of the battery at -18 degrees C.

[0007] Traditional battery life measurement instruments simulate and control load current and time, and then reversely estimate the current battery capacity (AH) to be tested, and then input the battery capacity (AH) of the original battery model specification, and then compare and calculate the decay ratio of the current battery capacity (AH) to be tested, which is the health life indicator SoH (State of Health).

[0008] The above-mentioned traditional battery life measuring instrument has the following disadvantages: 1. The battery terminals must be removed to test the battery, which is very troublesome, and if the battery terminals are not securely locked back, the vehicle system may malfunction and cause danger.

[0009] 2. Because the measurement is performed by simulating discharge, the measurement accuracy is not high.

[0010] The following two points are the reasons why traditional discharge measuring instruments cannot accurately determine the difference between the capacity (AH) of the battery under test and the capacity of the original new battery: 1. Because the simulated starting current is very different from the original factory specification condition CCA.

[0011] 2. Because the battery storage capacity (AH) of lead-acid batteries will be affected by ambient temperature. Summary of the invention

[0012] To solve the above problem, an object of the present invention is to provide a battery status measurement method.

[0013] To achieve the above-mentioned purpose of the present invention, the battery status measuring method of the present invention is applied to a digital measuring instrument and a load device, the digital measuring instrument includes a voltage detection circuit, a comparison unit and a display, the load device includes a motor and a battery, and the battery status measuring method includes: the voltage detection circuit of the digital measuring instrument is connected to the motor of the load device and the battery of the load device; the battery of the load device provides a starting voltage to the motor of the load device to start the motor of the load device; the voltage detection circuit of the digital measuring instrument detects the starting voltage to obtain a minimum starting voltage value; the voltage detection circuit of the digital measuring instrument transmits the minimum starting voltage value to the comparison unit of the digital measuring instrument; the comparison unit of the digital measuring instrument compares the minimum starting voltage value with a starting voltage threshold to obtain a battery status signal; the comparison unit of the digital measuring instrument transmits the battery status signal to the display of the digital measuring instrument; and the display of the digital measuring instrument displays the battery status signal.

[0014] Furthermore, in a specific embodiment of the battery status measuring method of the present invention as described above, the battery status measuring method further comprises: the comparison unit of the digital measuring instrument transmits the lowest starting voltage value to the display of the digital measuring instrument.

[0015] Furthermore, in a specific embodiment of the battery status measurement method of the present invention as described above, the battery status measurement method further comprises: the display of the digital measuring instrument simultaneously displays the battery status signal and the minimum starting voltage value.

[0016] Furthermore, in a specific embodiment of the battery status measurement method of the present invention as described above, the battery status measurement method further comprises: the display of the digital measuring instrument alternately displays the battery status signal and the minimum starting voltage value.

[0017] Furthermore, in a specific embodiment of the battery status measurement method of the present invention as described above, the minimum starting voltage value is greater than or equal to the starting voltage threshold; and the battery status signal is a normal signal indicating that the battery of the load device is normal.

[0018] Furthermore, in a specific embodiment of the battery status measurement method of the present invention as described above, the minimum starting voltage value is less than the starting voltage threshold; and the battery status signal is an abnormal signal indicating that the battery of the load device is abnormal.

[0019] Furthermore, in a specific embodiment of the battery status measurement method of the present invention as described above, the load device is a car using a 12 volt system; and the starting voltage threshold is 6 volts.

[0020] Furthermore, in a specific embodiment of the battery status measurement method of the present invention as described above, the load device is a car using a 24V system; and the starting voltage threshold is 10V.

[0021] Furthermore, in a specific embodiment of the battery status measuring method of the present invention as described above, the digital measuring instrument is a handheld digital measuring instrument; and the comparison unit is a microprocessor or a comparator circuit.

[0022] Furthermore, in a specific embodiment of the battery status measurement method of the present invention as described above, the battery of the load device is fully charged to be detected by the voltage detection circuit of the digital measuring instrument.

[0023] The utility model is to simply measure the life health status of the battery of the load device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 FIG. 4 is a flow chart of an embodiment of a battery status measurement method of the present invention.

[0025] Figure 2 FIG. 4 is a block diagram of an embodiment of a battery status measurement method applied to the present invention.

[0026] Figure 3 Schematic diagram of voltage range of the present invention.

[0027] In the figure: 10: digital measuring instrument; 20: load device; 102: voltage detection circuit; 104: comparison unit; 106: display; 202: motor; 204: battery; 206: starting voltage; 208: minimum starting voltage value; 210: starting voltage threshold; 212: battery status signal; 214: first voltage value; 216: voltage interval; 218: voltage sub-interval; 220: battery voltage; 222: charging threshold; S102: step; S104: step; S106: step; S108: step; S110: step; S112: step; S114: step. DETAILED DESCRIPTION

[0028] 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, but the embodiments are not intended to limit the present invention. 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 these 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 below with the help of the drawings: First, the following describes the origin and concept of the present invention: The important specification of a car battery is how much power the car battery can output instantly when the car's motor (or engine) is at the maximum starting current. 启动 =I 启动 *V 启动 , where I 启动 is the starting current (i.e., cranking amps, referred to as CA), V 启动 is the engine starting voltage. When the battery ages, the internal resistance of the battery increases and the battery's ability to store energy decreases (under the condition that the battery is fully charged). 启动 The currents are mostly similar; therefore, when the car's motor starts, the stored energy of the aging battery is reduced due to the reduction in the engine starting voltage (due to battery aging), that is, the battery's instantaneous starting output power will increase due to battery aging, resulting in a reduction in instantaneous output power. Also, because the battery starting voltage is too low, the car's engine motor and electrical control system cannot be started smoothly.

[0029] According to the standard specification of ISO 16750-2 Part 2 Electrical loads Clause 4.6.3 Starting profile, the electrical load of the car must adapt to and pass a simulated car battery voltage waveform (with a minimum voltage) test, wherein if the car uses a 12 volt system, the minimum voltage is 6 volts, and if the car uses a 24 volt system, the minimum voltage is 10 volts. That is, when the motor of the car is started (starting moment; at this time, the voltage of the battery of the car will drop sharply), if the sudden drop voltage of the battery of the car is lower than the minimum voltage, the electrical load of the car will not work properly; that is, the present invention determines whether the battery is qualified by the minimum voltage and the sudden drop voltage of the battery.

[0030] Therefore, the present invention does not need to remove the car battery from the car motor; when the car motor is started (starting moment; at this time, the voltage of the car battery will drop sharply), the present invention directly measures whether the lowest value of the sudden drop voltage of the car battery is greater than or equal to the above-mentioned lowest voltage to determine whether the battery is qualified.

[0031] Next, the following contents describe the details of the present invention: Please refer to Figure 1 , which is a flow chart of an embodiment of the battery status measurement method of the present invention; please also refer to Figure 2 , which is a block diagram of an embodiment of the battery status measurement method applied to the present invention. The battery status measurement method of the present invention is applied to a digital measuring instrument 10 and a load device 20. The digital measuring instrument 10 can be, for example, but the present invention is not limited to, a handheld digital measuring instrument, a portable digital measuring instrument, or a mobile digital measuring instrument. The load device 20 can be, for example, but the present invention is not limited to, a car.

[0032] The digital measuring instrument 10 includes a voltage detection circuit 102, a comparison unit 104, a display 106 and an analog-to-digital converter (not shown). Figure 2 The load device 20 includes a motor 202 and a battery 204; the motor 202 may also be referred to as an "engine starter motor" or a "load starter motor", the battery 204 may be, for example, but the present invention is not limited to, a lead-acid battery or a battery, and the comparison unit 104 may be, for example, but the present invention is not limited to, a microprocessor or a comparator circuit.

[0033] The battery status measurement method comprises the following steps: Step S102: The voltage detection circuit 102 of the digital measuring instrument 10 is connected to the motor 202 of the load device 20 and the battery 204 of the load device 20; then, the battery status measurement method enters step S104 and step S106. In more detail, the voltage detection circuit 102 of the digital measuring instrument 10 has a positive terminal test rod (not shown). Figure 2 ) and a negative terminal test rod (not shown Figure 2 ), the battery 204 of the load device 20 has a positive terminal (not shown in Figure 2 ) and a negative terminal (not shown Figure 2 ), the positive terminal test rod of the voltage detection circuit 102 is connected to the positive terminal of the battery 204, the negative terminal test rod of the voltage detection circuit 102 is connected to the negative terminal of the battery 204, and the positive terminal and the negative terminal of the battery 204 are also connected to the motor 202 of the load device 20 to supply power to the motor 202.

[0034] Step S104 : The battery 204 of the load device 20 provides a starting voltage 206 to the motor 202 of the load device 20 to start the motor 202 of the load device 20 , and the battery status measurement method also executes step S106 at the same time.

[0035] Step S106 : The voltage detection circuit 102 of the digital measuring instrument 10 detects the start-up voltage 206 to obtain a minimum start-up voltage value 208 ; then, the battery status measurement method enters step S108 .

[0036] In more detail, before the battery status measurement method executes step S104 and step S106, the battery 204 of the load device 20 is fully charged to be detected by the voltage detection circuit 102 of the digital measuring instrument 10. When the load device 20 is to be used, the load device 20 is remotely started or key-started from a static state, so that the battery 204 of the load device 20 provides the starting voltage 206 to the motor 202 of the load device 20 to start the motor 202 of the load device 20, and the act of starting the motor 202 of the load device 20 will cause the voltage of the battery 204 of the load device 20 to drop suddenly and then pull up again, and the lowest value of the voltage that drops suddenly is the lowest starting voltage value 208. The digital measuring instrument 10 can continuously detect the voltage over a period of time to indicate / record the lowest value of the voltage during this period of time.

[0037] Step S108 : the voltage detection circuit 102 of the digital measuring instrument 10 transmits the lowest starting voltage value 208 to the comparison unit 104 of the digital measuring instrument 10 ; then, the battery status measurement method enters step S110 .

[0038] Step S110: The comparison unit 104 of the digital measuring instrument 10 compares the minimum startup voltage value 208 with a startup voltage threshold 210 to obtain a battery status signal 212; then, the battery status measurement method enters step S112. In more detail, the comparison unit 104 stores the startup voltage threshold 210 in advance, or not shown in FIG. Figure 2A memory system of the present invention stores the startup voltage threshold 210 in advance and transmits the startup voltage threshold 210 to the comparison unit 104; if the load device 20 is the car using a 12 volt system, the startup voltage threshold 210 is 6 volts; if the load device 20 is the car using a 24 volt system, the startup voltage threshold 210 is 10 volts. If the minimum startup voltage value 208 is greater than or equal to the startup voltage threshold 210, the battery status signal 212 is a normal signal indicating that the battery 204 of the load device 20 is normal; if the minimum startup voltage value 208 is less than the startup voltage threshold 210, the battery status signal 212 is an abnormal signal indicating that the battery 204 of the load device 20 is abnormal.

[0039] Step S112 : The comparison unit 104 of the digital measuring instrument 10 transmits the battery status signal 212 to the display 106 of the digital measuring instrument 10 ; then, the battery status measurement method enters step S114 .

[0040] Step S114 : the display 106 of the digital measuring instrument 10 displays the battery status signal 212 .

[0041] Between step S112 and step S114, the comparison unit 104 of the digital measuring instrument 10 may also transmit the minimum starting voltage value 208 to the display 106 of the digital measuring instrument 10, so that in step S114, the display 106 of the digital measuring instrument 10 simultaneously displays the battery status signal 212 and the minimum starting voltage value 208, or the display 106 of the digital measuring instrument 10 alternately displays the battery status signal 212 and the minimum starting voltage value 208.

[0042] Furthermore, please refer to Figure 3 , which is a schematic diagram of the voltage range of the present invention, and please also refer to Figure 2 The comparison unit 104 of the digital measuring instrument 10 also stores a first voltage value 214 (or the memory system stores the first voltage value 214 and transmits the first voltage value 214 to the comparison unit 104). The first voltage value 214 is greater than the start-up voltage threshold 210. The comparison unit 104 of the digital measuring instrument 10 divides a voltage interval 216 between the first voltage value 214 and the start-up voltage threshold 210 into a plurality of voltage sub-intervals 218. The comparison unit 104 of the digital measuring instrument 10 determines which of the voltage sub-intervals 218 the minimum start-up voltage value 208 is located and generates the battery status signal 212 accordingly.

[0043] For example, the first voltage value 214 is 14 volts, the start voltage threshold 210 is 6 volts, and the voltage interval 216 has three voltage sub-intervals 218, namely 14 volts to 10 volts, 10 volts to 8 volts, and 8 volts to 6 volts; if the minimum start voltage value 208 is 12 volts (between 14 volts and 10 volts), the battery status signal 212 is displayed as "excellent"; if the minimum start voltage value 208 is 9 volts (between 10 volts and 8 volts), the battery status signal 212 is displayed as "good"; if the minimum start voltage value 208 is 7 volts (between 8 volts and 6 volts), the battery status signal 212 is displayed as "caution". If the minimum start voltage value 208 is 5 volts (less than 6 volts), the battery status signal 212 is displayed as "abnormal" or "bad".

[0044] Furthermore, before the battery 204 of the load device 20 provides the starting voltage 206 to the motor 202 of the load device 20 to start the motor 202 of the load device 20, the voltage detection circuit 102 of the digital measuring instrument 10 detects a battery voltage 220 of the battery 204 of the load device 20 and notifies the comparison unit 104 of the digital measuring instrument 10 of the battery voltage 220, so that the comparison unit 104 of the digital measuring instrument 10 determines the starting voltage threshold 210 based on the battery voltage 220.

[0045] For example, before the battery 204 of the load device 20 provides the starting voltage 206 to the motor 202 of the load device 20 to start the motor 202 of the load device 20, the voltage detection circuit 102 of the digital measuring instrument 10 detects that the battery voltage 220 of the battery 204 of the load device 20 is 12 volts and notifies the comparison unit 104 of the digital measuring instrument 10 that the battery voltage 220 is 12 volts, so that the comparison unit 104 of the digital measuring instrument 10 determines the starting voltage threshold 210 to be 6 volts based on the battery voltage 220.

[0046] Furthermore, before the battery 204 of the load device 20 provides the starting voltage 206 to the motor 202 of the load device 20 to start the motor 202 of the load device 20, the voltage detection circuit 102 of the digital measuring instrument 10 detects the battery voltage 220 of the battery 204 of the load device 20 and notifies the comparison unit 104 of the digital measuring instrument 10 of the battery voltage 220, so that if the battery voltage 220 is less than a charging threshold 222 (pre-stored in the comparison unit 104 of the digital measuring instrument 10; or the memory system stores the charging threshold 222 and transmits the charging threshold 222 to the comparison unit 104), the comparison unit 104 of the digital measuring instrument 10 controls the display 106 of the digital measuring instrument 10 to display that the battery 204 of the load device 20 needs to be charged. Thereby, the battery 204 of the load device 20 is fully charged to be detected by the voltage detection circuit 102 of the digital measuring instrument 10 .

[0047] Again, please refer to Figure 2 The present invention also provides a digital measuring instrument 10, which is applied to a load device 20, the load device 20 includes a motor 202 and a battery 204, the digital measuring instrument 10 includes a voltage detection circuit 102, a comparison unit 104 and a display 106, the voltage detection circuit 102 is connected to the motor 202 and the battery 204, the comparison unit 104 is electrically connected to the voltage detection circuit 102, and the display 106 is electrically connected to the comparison unit 104. The rest of the content of the digital measuring instrument 10 of the present invention is the same as the content of the battery status measurement method of the present invention, and for the sake of brevity, the description thereof will not be repeated here.

[0048] Compared with the prior art battery life health status measurement method, the present invention has the following advantages: 1. No need to disassemble the battery terminals, can be measured directly with an ammeter.

[0049] 2. The test condition is based on the usable health status of the battery in use in the vehicle to be tested. The advantages are as follows: a. The starting current (CA) is based on the vehicle to be tested as the starting condition, rather than simulation.

[0050] b. The ambient temperature is the health condition of the vehicle under test in the environment at that time. If the vehicle and battery under test are tested in a cold region, it is also to confirm whether the vehicle can be started healthily with cold cranking current (CCA) at low temperatures.

[0051] c. The detection speed is fast. As long as the engine of the vehicle to be tested is started, the battery health result can be immediately known.

[0052] The battery specifications can be found at the following website, so I will not go into details here: http: / / www.yuasa.com.tw / product-detail.php The characteristics of the battery can be found at the following website, so I will not go into details here: http: / / www.yuasa.com.tw / service_and_knowledge03.php The utility of the present invention is to simply measure the life health status of the battery 204 of the load device 20 .

[0053] However, the above is only an embodiment of the present invention, and should not limit the scope of the present invention. That is, all equivalent changes and modifications made according to the claims of the present invention should still fall within the scope of the patent coverage of the present invention. The present invention can also have many other embodiments. Without departing from the spirit and essence of the present invention, those familiar with the art can make various corresponding changes and deformations according to the present invention, but these corresponding changes and deformations should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A battery status measurement method, applied to a digital measuring instrument (10) and a load device (20), wherein the digital measuring instrument (10) comprises a voltage detection circuit (102), a comparison unit (104) and a display (106), and the load device (20) comprises a motor (202) and a battery (204), characterized in that: The battery status measurement method comprises: The voltage detection circuit (102) of the digital measuring instrument (10) is connected to the motor (202) of the load device (20) and the battery (204) of the load device (20) (S102); The battery (204) of the load device (20) provides a starting voltage (206) to the motor (202) of the load device (20) to start the motor (202) of the load device (20) (S104); The voltage detection circuit (102) of the digital measuring instrument (10) detects the starting voltage (206) to obtain a minimum starting voltage value (208) (S106); The voltage detection circuit (102) of the digital measuring instrument (10) transmits the lowest starting voltage value (208) to the comparison unit (104) of the digital measuring instrument (10) (S108); The comparison unit (104) of the digital measuring instrument (10) compares the minimum startup voltage value (208) and a startup voltage threshold (210) to obtain a battery status signal (212) (S110); The comparison unit (104) of the digital measuring instrument (10) transmits the battery status signal (212) to the display (106) of the digital measuring instrument (10) (S112); and The display (106) of the digital measuring instrument (10) displays the battery status signal (212) (S114).

2. The battery status measurement method according to claim 1, characterized in that: Further including: The comparison unit (104) of the digital measuring instrument (10) transmits the lowest starting voltage value (208) to the display (106) of the digital measuring instrument (10).

3. The battery status measurement method according to claim 2, characterized in that: Further including: The display (106) of the digital measuring instrument (10) simultaneously displays the battery status signal (212) and the minimum starting voltage value (208).

4. The battery status measurement method according to claim 2, wherein: Further including: The display (106) of the digital measuring instrument (10) alternately displays the battery status signal (212) and the minimum starting voltage value (208).

5. The battery status measurement method according to claim 2, characterized in that: The minimum starting voltage value (208) is greater than or equal to the starting voltage threshold value (210); and the battery status signal (212) is a normal signal indicating that the battery (204) of the load device (20) is normal.

6. The battery status measurement method according to claim 2, characterized in that: The minimum starting voltage value (208) is less than the starting voltage threshold value (210); and the battery status signal (212) is an abnormal signal indicating that the battery (204) of the load device (20) is abnormal.

7. The battery status measurement method according to claim 2, wherein: The load device (20) is a car using a 12-volt system; the starting voltage threshold (210) is 6 volts.

8. The battery status measurement method according to claim 2, wherein: The load device (20) is a car using a 24 volt system; the starting voltage threshold (210) is 10 volts.

9. The battery status measurement method according to claim 2, wherein: The digital measuring instrument (10) is a handheld digital measuring instrument; the comparison unit (104) is a microprocessor or a comparator circuit.

10. The battery status measurement method according to claim 2, wherein: The battery (204) of the load device (20) is fully charged to be detected by the voltage detection circuit (102) of the digital measuring instrument (10).

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