TW201803242A - Battery internal resistance detection device with electricity recharge, and application method thereof capable of recovering energy consumed during battery internal resistance measurement - Google Patents

Abstract

The present invention provides a battery internal resistance detection device with electricity recharge and application method thereof, which comprises: a battery unit, a capacitor, a bidirectional conversion unit, a first voltage detection unit connected in parallel with the battery, a current detection unit connected in series with the battery, and a control unit. The battery unit comprises a battery electrically connected to the capacitor. The bidirectional conversion unit is electrically connected between the battery and the capacitor. The control unit is electrically connected to the bidirectional conversion unit, the first voltage detection unit, and the current detection unit. The control unit comprises a DC resistance detection module, an AC impedance detection module, and an electricity recharge module. After measuring the DC resistance or the AC internal resistance of the battery, the electricity recharge module may control the electricity recharged to the battery for recovering the energy consumed by the battery during charging and discharging, so as to maintain the energy of the battery.

Description

Battery internal resistance detection device with electric energy recharging and application method thereof

The invention relates to a battery internal resistance detection device and an application method thereof, in particular to a battery internal resistance detection device with electric energy recharging capable of recovering to the original power and an application method thereof.

Please refer to FIG. 1, which is an equivalent circuit 1 of a general battery. The equivalent circuit 1 includes a battery terminal voltage 10, a battery internal potential 11 and an electrical connection between the battery terminal voltage 10 and the battery. Battery internal resistance 12 between potentials 11. The battery internal resistance 12 is generally divided into a DC internal resistance and an AC internal resistance. The DC internal resistance is a resistance received by a DC current flowing through the battery, and the AC internal resistance is a resistance received by the AC current flowing through the battery. The battery internal resistance 12 is a combination of an ohmic resistance 13, a polarization resistance 14, and an electric double layer capacitor (Double Layer Capacitance) 15.

The ohmic resistance 13 is mainly composed of an electrode resistance, an electrolyte resistance, a separator resistance, and a connection line resistance. The polarization resistance 14 refers to internal resistance caused by polarization of the battery during an electrochemical reaction, and includes charge transfer resistance and mass transfer impedance.

Please refer to FIG. 2, which is a DC measurement circuit 2 of a conventional DC internal resistance measurement method. The DC measurement circuit 2 includes a battery 20, an ammeter 21 electrically connected to the positive end of the battery 20, and an electrical property. A voltmeter 22 connected between the ammeter 21 and the negative terminal of the battery 20, a switch 23 electrically connected to a connection terminal between the ammeter 21 and the voltmeter 22, and an electrical terminal electrically connected to the other end of the switch 23 and electrically A load resistor 24 is connected between the voltmeter 22 and the negative terminal of the battery 20. The battery 20 has an open-circuit voltage 200 and a DC internal resistance 201 internally connected in series with the open-circuit voltage 200.

(1) ；其中，

代表為該直流內阻201，

代表為該開路電壓200，

代表為該負載電阻24兩端的電壓，

代表為該電流表21量測到的電流。When the switch 23 is not turned on (also referred to as not conducting), the voltage measured by the voltmeter 22 is the open-circuit voltage 200. When the switch 23 is turned on (also called on), the voltage measured by the voltmeter 22 is the voltage across the load resistor 24. The current measured by the ammeter 21 is the output current of the battery 20, so the DC internal resistance 201 can be obtained by the following equation,

(1); of which

This is the DC internal resistance 201,

This is the open circuit voltage 200,

Is the voltage across the load resistor 24,

Represents the current measured for this ammeter 21.

(2) ；其中，

代表為該負載電阻24。If the load resistance 24 is known, the equation (1) can be replaced by the following equation,

(2); of which

Represented as the load resistance 24.

Measure the ohmic resistance 13 and polarization resistance 14 through the length of the discharge test. When the test time is less than a preset value, the measured internal resistance is ohmic resistance 13, and when the time is greater than the preset value, the measured The measured internal resistances are ohmic resistance 13 and polarization resistance 14. However, because the traditional DC internal resistance measurement method is to discharge the resistance, each time the internal resistance of the battery is measured, it will cause the battery to consume some power, especially for series battery packs. When the individual battery power is reduced, Causes the capacity balance problem of series battery packs, and even shortens the battery pack life.

Please refer to FIG. 3, which is an AC measurement circuit 3 of a conventional AC internal resistance measurement method. The AC measurement circuit 3 includes a battery 30, an AC current source 31 electrically connected in parallel with the battery 30, and A voltmeter 32 electrically connected and connected in parallel with the battery 30. The battery 30 has an open circuit voltage 300 and an AC internal resistance 301 which is internally connected in series with the open circuit voltage 300.

It is known that the AC internal resistance measurement method is to inject AC current to the battery 30, and measure the AC voltage change value after the battery 30 is injected with AC current, and calculate the AC internal resistance 301 according to the voltage and current change values. . When the AC current source 31 is a positive half cycle, the AC current source 31 charges the battery 30, and when the AC current source 31 is a negative half cycle, the battery 30 is discharged. However, since the charging and discharging efficiency of the battery 30 is not the same, the AC internal resistance 301 still consumes a small amount of electricity when the AC internal resistance 301 is measured.

As mentioned above, when the DC internal resistance or the AC internal resistance is measured through the DC measurement circuit 2 or the AC measurement circuit 3 respectively, the batteries 20 and 30 will consume some power. Therefore, it is necessary to improve the device for measuring internal resistance.

An object of the present invention is to provide a battery internal resistance detection device with electric energy recharging and an application method thereof, which has electric energy recharging to solve the lack of power consumption during conventional measurement.

According to the foregoing object, the present invention provides a battery internal resistance detection device with electric energy recharging, which includes a battery unit, a capacitor, a bidirectional conversion unit, a first voltage detection unit, a current detection unit, and a control unit. The battery unit includes a battery electrically connected to the capacitor; the bidirectional conversion unit is electrically connected between the battery and the capacitor; the first voltage detection unit is connected in parallel with the battery; and the current detection unit is electrically connected to the battery. Between the bidirectional conversion unit and one end of the battery, the current detection unit is connected in series with the battery; the control unit is electrically connected to the bidirectional conversion unit, the first voltage detection unit and the current detection unit, and the control unit includes a DC A resistance detection module, an AC impedance detection module, and an electric energy recharging module. The electric energy recharging module is used to control the electric energy recharged to the battery.

；其中，

為該電池回充的電量，

為該電池之充電電流，

為該電池充電效率。Further, the electric energy recharging equation for controlling the electric energy recharging module to recharge to the battery is the following equation:

;among them,

The amount of charge recharged for the battery,

To charge the battery,

Charge the battery efficiently.

Further, it further includes a second voltage detection unit connected in parallel with the capacitor, and the control unit is electrically connected to the second voltage detection unit.

Further, it further comprises an AC / DC conversion unit electrically connecting the capacitor to the control unit, and an external AC power supply electrically connected to the AC / DC conversion unit; wherein the capacitor is electrically connected to the AC / DC Between the conversion unit and the bidirectional conversion unit, the AC / DC conversion unit is electrically connected between the external AC power source and the capacitor.

Further, the control unit is set as a chip or a microprocessor.

Furthermore, the present invention further provides an application method using a detection device as an application, which includes the following steps:

Step 1: The battery is discharged through the bi-directional conversion unit in an instant to cause the capacitor to discharge a large current, and the discharge energy is stored in the capacitor;

Step 2: measuring the instantaneous change of the DC voltage discharged by the battery through the first voltage detection unit, and measuring the instantaneous change of the DC current discharged by the battery through the current detection unit;

Step 3: Capture the instantaneous change in DC voltage and instantaneous change in DC current through the DC resistance detection module to calculate the DC internal resistance of the battery;

Step 4: The electric energy recharging module controls the DC electric energy recharged to the battery through switching of the bidirectional conversion unit;

Step 5: Inject an AC test signal to the battery;

Step 6: measuring the AC voltage of the battery through the first voltage detection unit, and measuring the AC current of the battery through the current detection unit; and

Step 7: Acquire AC voltage and AC current through the AC impedance detection module to calculate the AC internal resistance of the battery.

Further, after step 7, a step is further included: the electric energy recharging module controls the electric energy recharged to the battery through the switching of the bidirectional conversion unit.

Further, between step 1 and step 7, a step is further included: detecting whether the energy of the capacitor is lost through a second voltage detecting unit.

；其中，

為該電池回充的電量，

為該電池之充電電流，

為該電池充電效率。Further, the electric energy recharging equation for controlling the electric energy recharging module to recharge to the battery is the following equation:

;among them,

The amount of charge recharged for the battery,

To charge the battery,

Charge the battery efficiently.

It further includes an AC / DC conversion unit electrically connecting the capacitor to the control unit, and an external AC power supply electrically connected to the AC / DC conversion unit; the external AC power supply is switched via the AC / DC conversion unit It recharges the capacitor.

The invention is characterized by:

1. In this case, the capacity of the battery can be stored when the battery is discharged through the setting of the capacitor, and then the battery can be recharged by the energy on the capacitor when the battery is charged, so that the battery can be used for internal resistance measurement. Does not consume power.

2.Because the capacitor needs to consider the charging current and the charging voltage when the capacitor is used to recharge the battery, the recharged electricity in this case uses the constant voltage and constant current charging method and cooperates with the electric energy recharge equation to avoid overvoltage. Charging damages the life of the battery.

3. In this case, the DC internal resistance measurement of the battery is performed by discharging the capacitor with a large current. The large current discharge can increase the accuracy of the battery internal resistance measurement.

4. In this case, the cooperation of the AC / DC conversion unit, the external AC power supply and the bidirectional conversion unit enables it to replenish approximately 100% of the electric energy to the battery.

The following is a detailed description of how the structures of the present invention are combined and used in conjunction with the accompanying drawings. It should be easier to understand the purpose, technical content, features and effects achieved by the present invention.

Please refer to FIG. 4, which is a battery internal resistance detection device with electric energy recharge provided by the present invention. The detection device 4 includes a battery unit 40, a capacitor 41, a bidirectional conversion unit 42, and a first voltage detection device. A measurement unit 43, a current detection unit 44, and a control unit 45. among them,

The battery unit 40 includes a battery 400 electrically connected to the capacitor 41. The bidirectional conversion unit 42 is electrically connected between the battery 400 and the capacitor 41. Two ends of one conversion side of the bidirectional conversion unit 42 are electrically connected to the positive terminal and the negative terminal of the battery 400, and the bidirectional conversion The two ends of the unit 42 opposite to the other conversion side of the battery 400 are electrically connected to the two ends of the capacitor 41 respectively.

The first voltage detection unit 43 is connected to the battery 400 in parallel, thereby measuring the voltage across the battery 400. The current detection unit 44 is electrically connected between the bidirectional conversion unit 42 and one end of the battery 400. The current detection unit 44 is connected in series with the battery 400 to measure the current of the battery 400. The current detection unit 44 includes a current measurement resistor (not shown) connected to the battery 400 in series, and a current detector (not shown) connected to the current measurement resistor in parallel.

The control unit 45 is electrically connected to the bidirectional conversion unit 42, the first voltage detection unit 43 and the current detection unit 44. The control unit 45 includes a DC resistance detection module 450 and an AC impedance detection module. 451, and a power recharge module 452. The DC resistance detection module 450 is electrically connected to the first voltage detection unit 43 and the current detection unit 44. The AC impedance detection module 451 is electrically connected to the first voltage detection unit 43 and the current detection unit 44. The power recharging module 452 is used to control the power recharged to the battery 400.

Please refer to FIG. 6 for the continuation, which is the application method 5 using the detection device 4 in this case, which includes the following steps:

Step 1: Instantly switch the battery 400 through the bidirectional conversion unit 42 to discharge the capacitor 41 with a large current, and store the discharged energy in the capacitor 41. In detail, the control unit 45 controls the bidirectional conversion unit 42. The conducting direction causes the battery 400 to instantly discharge the capacitor 41 through the bidirectional conversion unit 42, and the capacitor 41 stores the energy discharged by the battery 400;

Step 2: Measure the instantaneous change of the DC voltage discharged by the battery 400 through the first voltage detection unit 43 and measure the instantaneous change of the DC current discharged by the battery 400 through the current detection unit 44;

Step 3: Capture the instantaneous change in DC voltage and instantaneous change in DC current through the DC resistance detection module 450 to calculate the DC internal resistance of the battery 400. In detail, the electrical resistance of the DC resistance detection module 450 The first voltage detection unit 43 and the current detection unit 44 are connected to capture the instantaneous change in voltage and the instantaneous change in current, respectively, and thereafter divide the instantaneous change in voltage by the instantaneous change in current, thereby obtaining DC internal resistance of the battery 400;

Step 4: The electric energy recharging module 452 controls the DC electric energy recharged to the battery 400 through the switching of the bidirectional conversion unit 42. In other words, after measuring the DC internal resistance of the battery 400, the bidirectional conversion is switched. The conduction direction of the unit 42 enables the electric energy on the capacitor 41 to charge the battery 400 to make up for the energy consumed when the battery 400 is discharged;

Step 5: Inject an AC test signal into the battery 400 as a low-frequency signal; it controls the conduction direction of the bidirectional conversion unit 42 through the control unit 45 to inject the AC test signal into the battery 400; In the example, the frequency of the AC test signal is selected to be less than 1 Hertz (Hz);

Step 6: Measure the AC voltage of the battery 400 through the first voltage detection unit 43 and measure the AC current of the battery 400 through the current detection unit 44; and

Step 7: Acquire AC voltage and AC current through the AC impedance detection module 451 to calculate the AC internal resistance of the battery 400. In other words, the AC impedance detection module 451 is electrically connected to the first voltage detection unit. 43 and the current detection unit 44 respectively capture an AC voltage and an AC current, and then divide the AC voltage by the AC current to obtain the AC internal resistance of the battery 400.

及該電流偵測單元44所測得的電流瞬間變化量

傳至該直流電阻偵測模組450，利用該直流電阻偵測模組450內嵌的程式來計算該電壓瞬間變化量與該電流瞬間變化量之間的比值，藉此得到該電池400的直流內阻，即

。More specifically, the measurement steps of the DC internal resistance will be described. During the measurement, the control unit 45 will control the conduction direction of the bidirectional conversion unit 42 to cause the battery 400 to instantly discharge the capacitor 41 through the bidirectional conversion unit 42. The battery 400 discharges energy. The amount of instantaneous change in voltage measured by the first voltage detection unit 43 thereafter

And the instantaneous change in current measured by the current detection unit 44

It is transmitted to the DC resistance detection module 450, and the program embedded in the DC resistance detection module 450 is used to calculate the ratio between the instantaneous change in voltage and the instantaneous change in current, thereby obtaining the DC of the battery 400. Internal resistance, ie

.

Generally, the internal resistance of a battery is relatively small, usually only tens of milliohms, and the internal resistance of a large capacity is even lower, so it will not be easily detected. Therefore, in order to improve the accuracy of the internal resistance measurement, in this case, the DC internal resistance measurement of the battery 400 is performed by discharging a large current to the capacitor 41. The large current discharge can increase the accuracy of the internal resistance measurement of the battery 400. In addition, the closer the discharge current tested to the load current during normal use, the more accurate the internal resistance value obtained, and the more it can represent the true internal resistance value of the battery 400.

及該電流偵測單元44所測得的交流電流

傳至該交流阻抗偵測模組451，利用該交流阻抗偵測模組451內嵌的程式來將該交流電壓除以該交流電流，藉此得到該電池400的交流內阻，即

。More specifically, the AC internal resistance measurement step is described. During the measurement, the control unit 45 controls the conduction direction of the bidirectional conversion unit 42 so that the DC voltage on the capacitor 41 is converted into an AC voltage to inject a low frequency signal to the battery 400. The AC test signal, and the AC voltage measured by the first voltage detection unit 43 thereafter

And the AC current measured by the current detection unit 44

Transmitted to the AC impedance detection module 451, and uses the program embedded in the AC impedance detection module 451 to divide the AC voltage by the AC current, thereby obtaining the AC internal resistance of the battery 400, that is,

.

It is inherited that when the internal resistance measurement of the battery 400 is performed in this case, the capacity of the battery 400 can be stored when the battery is discharged through the setting of the capacitor 41, and then the internal resistance can be used to charge the battery 400 through the capacitor. The energy at 41 replenishes the battery 400, so that the battery 400 does not consume power when performing internal resistance measurement, and effectively improves the lack of power consumption during conventional measurement.

(3) ；其中，

為該電池400回充的電量，

為該電池400之充電電流，

為該電池400充電效率。因為電能由該電容41補回該電池400時需要考量充電電流及充電電壓的限制值，因此本案於步驟四中回充至該電池400之直流電量採用定電壓及定電流的充電方式並配合該電能回充方程式(如式子(3))，以避免過電壓充電而損害該電池400的壽命。Further, in this case, the electric energy recharging module 452 controls the electric energy recharging equation to be recharged to the battery 400 as the following equation:

(3); of which

The amount of charge recharged for the battery 400,

To charge the battery 400,

Charge the battery 400 efficiently. Because the capacitor 41 needs to consider the charging current and the charging voltage when the capacitor 400 is used to replenish the battery 400, the DC power recharged to the battery 400 in step 4 uses a constant voltage and constant current charging method and cooperates with The electric energy recharge equation (such as the formula (3)) to avoid over-voltage charging and damage the life of the battery 400.

Furthermore, although the AC test signal charges the battery 400 during the positive half cycle and discharges the battery 400 during the negative half cycle, the charge and discharge efficiency of the battery are not the same. A small amount of power of the battery 400 will still be consumed. In order to solve the deficiency, a step is included after step 7: the electric energy recharge module 452 controls the electric energy recharged to the battery 400 through the switching of the bidirectional conversion unit 42. . In other words, after the AC internal resistance of the battery 400 is measured, the electric power recharge module 452 is used to supplement some of the micro-power consumed by the battery 400.

Further, referring to FIG. 4 and FIG. 5, the detecting device 4 further includes a second voltage detecting unit 46 connected in parallel with the capacitor 41, and an AC electrically connecting the capacitor 41 and the control unit 45. The / DC conversion unit 47 and an external AC power source 48 electrically connected to the AC / DC conversion unit 47. The control unit 45 is electrically connected to the second voltage detection unit 46. The capacitor 41 is electrically connected between the AC / DC conversion unit 47 and the bidirectional conversion unit 42, and the AC / DC conversion unit 47 is electrically connected between the external AC power source 48 and the capacitor 41. The switching of the external AC power source 48 via the AC / DC conversion unit 47 causes the capacitor 41 to replenish its energy, thereby enabling the battery 400 to be restored to approximately 100% power.

More specifically, between step 1 and step 7, a step is further included: detecting whether the energy of the capacitor 41 is lost through the second voltage detecting unit 46. Once the second voltage detection unit 46 detects that the energy on the capacitor 41 is lost, the control unit 45 can immediately control the AC / DC conversion unit 47 to be turned on after receiving the message from the second voltage detection unit 46, so that The external AC power source 48 charges the capacitor 41 so that the energy lost in the capacitor 41 can be replenished, so that when the electric capacity of the capacitor 41 is recharged to the battery 400, the electricity of the battery 400 can be hardly lost. In this case, the cooperation of the AC / DC conversion unit 47, the external AC power source 48, and the bidirectional conversion unit 42 enables it to replenish approximately 100% of the electric energy to the battery 400.

In other words, when the DC internal resistance measurement of the battery 400 is performed, once the second voltage detection unit 46 detects that the energy on the capacitor 41 is lost, the control unit 45 receives the second voltage detection The message from the unit 46 can immediately control the AC / DC conversion unit 47 to be turned on, so that the external AC power source 48 charges the capacitor 41 so that the energy lost in the capacitor 41 can be made up. Similarly, when the AC internal resistance measurement of the battery 400 is performed, once the second voltage detection unit 46 detects that the energy on the capacitor 41 is lost, the control unit 45 receives the second voltage detection unit The message of 46 can immediately control the AC / DC conversion unit 47 to be turned on, so that the external AC power source 48 charges the capacitor 41, so that the energy lost in the capacitor 41 can be made up.

In this case, the embodiment in which the capacitor 41 is charged by using the cooperation between the AC / DC conversion unit 47 and the external AC power source 48 is taken as an example. In another embodiment, the energy lost in the capacitor 41 can also pass through the bidirectional The switching direction of the conversion unit 42 selects to charge the capacitor 41 with an internal power source.

In addition, actions such as detecting whether there is loss of energy in the capacitor 41, electrically connecting the external AC power source 48, and supplementing the energy loss in the capacitor 41 through the external AC power source 48 are only required to measure the DC internal resistance or AC It is sufficient to make up the losses on the capacitor 41 before the resistance, so in practical applications, it can be in each step or between each step. For example, when measuring the DC internal resistance, complete it in step 2 or between step 2 and step 3. If measuring the AC internal resistance, you can complete it in step 6 or in step Fill in between step 6 and step 7, and so on.

In addition, in the embodiment of the present case, the DC resistance of the battery 400 is measured first, and then the AC resistance of the battery 400 is measured to illustrate the steps. In practical applications, the AC resistance of the battery 400 can also be measured first. After that, the DC resistance of the battery 400 is measured, and its sequence can be adjusted elastically.

In the embodiment of the present case, the control unit 45 is set as a chip or a microprocessor, and the DC power group detection module 450, the AC impedance detection module 451, and the power recharge module 452 are embedded in the control. Unit 45. The program of how the control unit 45 controls the conduction direction of the bidirectional conversion unit 42 or the program embedded in the calculation of the DC internal resistance or the AC internal resistance is a very mature technology today, and is not the main direction of this case. I will not repeat them here.

In summary, the following features can be obtained in this case:

1. In this case, the capacity of the battery 400 can be stored when the battery is discharged through the setting of the capacitor 41. After the internal resistance is obtained, the battery 400 can be replenished into the battery 400 by the energy on the capacitor 41 when the internal resistance is obtained. The battery 400 does not consume power when performing internal resistance measurement, which effectively improves the lack of power consumption during conventional measurement.

2. Because the capacitor 41 needs to consider the charging current and the charging voltage limit when recharging the battery 400 by the capacitor 41, the recharged electricity in this case adopts the constant voltage and constant current charging method and cooperates with the electric energy recharge equation (such as the formula (3)) to prevent over-voltage charging from damaging the life of the battery 400.

3. In this case, the DC internal resistance measurement of the battery 400 is performed by discharging a large current to the capacitor 41. The large current discharge can increase the accuracy of the internal resistance measurement of the battery 400.

4. In this case, the cooperation of the AC / DC conversion unit 47, the external AC power source 48, and the bidirectional conversion unit 42 enables it to replenish approximately 100% of the electric energy to the battery 400.

However, the foregoing is only a preferred embodiment of the present invention, and its purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and is not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made to the shapes, structures, and characteristics described in the scope of the application of the present invention shall be included in the scope of the patent application of the present invention.

﹝ Xizhi
1‧‧‧ equivalent circuit
10‧‧‧ Battery terminal voltage
11‧‧‧Battery potential
12‧‧‧ Battery internal resistance
13‧‧‧ohm resistance
14‧‧‧ polarization resistance
15‧‧‧electric double-layer capacitor
2‧‧‧DC measurement circuit
20‧‧‧ Battery
200‧‧‧ open circuit voltage
201‧‧‧DC internal resistance
21‧‧‧ Ammeter
22‧‧‧Voltmeter
23‧‧‧Switch
24‧‧‧Load resistance
3‧‧‧AC measurement circuit
30‧‧‧ battery
300‧‧‧ open circuit voltage
301‧‧‧Internal resistance
31‧‧‧AC current source
32‧‧‧Voltmeter
﹝ 本 发明 ﹞
4‧‧‧ Detection Device
40‧‧‧ battery unit
400‧‧‧ battery
41‧‧‧Capacitor
42‧‧‧Bidirectional conversion unit
43‧‧‧first voltage detection unit
44‧‧‧Current detection unit
45‧‧‧Control unit
450‧‧‧DC resistance detection module
451‧‧‧AC Impedance Detection Module
452‧‧‧Power Recharge Module
46‧‧‧Second voltage detection unit
47‧‧‧AC / DC conversion unit
48‧‧‧External AC Power
5‧‧‧Application method

Figure 1: Circuit diagram of a conventional battery equivalent circuit. Figure 2: Circuit diagram of a conventional DC measurement circuit. Figure 3: Circuit diagram of a conventional AC measurement circuit. FIG. 4 is a circuit diagram of a first embodiment of a detection device according to the present invention. FIG. 5 is a circuit diagram of a second embodiment of the detection device of the present invention. FIG. 6 is a flowchart of an application method of the present invention.

4‧‧‧ Detection Device

40‧‧‧ battery unit

400‧‧‧ battery

41‧‧‧Capacitor

42‧‧‧Bidirectional conversion unit

43‧‧‧first voltage detection unit

44‧‧‧Current detection unit

45‧‧‧Control unit

450‧‧‧DC resistance detection module

451‧‧‧AC Impedance Detection Module

452‧‧‧Power Recharge Module

46‧‧‧Second voltage detection unit

Claims (10)

A battery internal resistance detection device with electric energy recharging includes: a battery unit, the battery unit includes a battery; a capacitor, the capacitor is electrically connected to the battery; a bidirectional conversion unit, the bidirectional conversion unit is electrically Connected between the battery and the capacitor; a first voltage detection unit, the first voltage detection unit is connected in parallel with the battery; a current detection unit, the current detection unit is electrically connected between the bidirectional conversion unit and the Between one end of the battery, the current detection unit is connected in series with the battery; and a control unit electrically connected to the bidirectional conversion unit, the first voltage detection unit and the current detection unit, the control unit includes a DC A resistance detection module, an AC impedance detection module, and an electric energy recharging module. The electric energy recharging module is used to control the electric energy recharged to the battery. The battery internal resistance detection device with electric energy recharging as described in item 1 of the scope of the patent application, wherein the electric energy recharging module that controls the electric energy recharging to the battery is the following equation:

;among them,

The amount of charge recharged for the battery,

To charge the battery,

Charge the battery efficiently. As described in item 1 of the scope of the patent application, the battery internal resistance detection device with electric energy recharging further includes a second voltage detection unit connected in parallel with the capacitor, and the control unit is electrically connected to the second voltage detection unit. For example, the battery internal resistance detection device with electric energy recharge described in item 1 or item 2 or item 3 of the patent application scope further includes an AC / DC conversion unit electrically connecting the capacitor to the control unit, and An external AC power source electrically connected to the AC / DC conversion unit; wherein the capacitor is electrically connected between the AC / DC conversion unit and the bidirectional conversion unit, and the AC / DC conversion unit is electrically connected to the external AC Between the power supply and this capacitor. The battery internal resistance detection device with electric energy recharge according to item 1 or item 2 or item 3 of the patent application scope, wherein the control unit is set as a chip or a microprocessor. An application method of a battery internal resistance detection device with electric energy recharge as described in item 1 of the scope of patent application, which includes the following steps: Step 1: Make the battery instantly switch through the bidirectional conversion unit to The capacitor discharges a large current and stores the discharge energy in the capacitor. Step 2: Measure the instantaneous change in the DC voltage discharged by the battery through the first voltage detection unit, and measure the DC voltage discharged by the battery through the current detection unit. Instantaneous change of current; Step 3: Capture the instantaneous change of DC voltage and instantaneous change of DC current through the DC resistance detection module to calculate the DC internal resistance of the battery; Step 4: The electric energy recharge module passes the The switching of the bidirectional conversion unit enables it to control the DC power recharged to the battery; Step 5: Inject an AC test signal to the battery; Step 6: Measure the AC voltage of the battery through the first voltage detection unit, and pass through the battery The current detection unit measures the AC current of the battery; and step 7: Acquire AC through the AC impedance detection module Voltage alternating current, in order to calculate the AC resistance of the battery. The application method described in item 6 of the scope of patent application, further comprising a step after step 7: the electric energy recharging module controls the electric energy recharged to the battery through the switching of the bidirectional conversion unit. The application method described in item 6 of the scope of patent application, further comprising a step between step one and step seven: detecting whether the energy of the capacitor is lost through a second voltage detecting unit. The application method described in item 6 or item 7 or item 8 of the scope of patent application, wherein the electric energy recharging module for controlling the electric energy recharging module to recharge to the battery is the following equation:

;among them,

The amount of charge recharged for the battery,

To charge the battery,

Charge the battery efficiently. According to the application method described in item 6 or item 7 or item 8 of the scope of patent application, the method further includes an AC / DC conversion unit electrically connecting the capacitor to the control unit, and an AC / DC conversion electrically connected. The unit's external AC power supply; the external AC power supply recharges the capacitor via the AC / DC conversion unit.