Internal resistance detection circuit and electronic equipment

Abstract

The utility model relates to an internal resistance detection circuit and electronic equipment. The internal resistance detection circuit comprises a battery access module, a current detection resistor and an amplification module; the battery access module comprises a battery to be detected, the battery to be detected and the current detection resistor are connected in series, and the current detection resistor is further connected with the input end of the amplification module. The internal resistance detection circuit can accurately determine the internal resistance of the battery.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to an internal resistance detection circuit and electronic equipment. Background Art

[0002] In the energy storage field, the internal resistance of batteries is a very important parameter. For example, when assembling batteries in energy storage inverters, the internal resistance of the batteries is used to determine whether they are suitable for series or parallel connection.

[0003] Currently, battery specifications often list parameters such as internal resistance, and personnel often use the internal resistance listed in the specifications directly. However, the internal resistance listed in the specifications is not completely accurate. Therefore, how to test the internal resistance of a battery before use is a technical problem that needs to be solved urgently. Utility Model Content

[0004] Based on this, it is necessary to provide an internal resistance detection circuit and electronic equipment that can more accurately determine the internal resistance of a battery in order to address the above technical issues.

[0005] In the first aspect, the present application provides an internal resistance detection circuit, including a battery access module, a current sensing resistor and an amplifier module; the battery access module includes a battery to be detected, the battery to be detected and the current sensing resistor are connected in series, and the current sensing resistor is also connected to the input end of the amplifier module.

[0006] In one embodiment, the internal resistance detection circuit further includes a switch element, which is connected in series between the battery to be detected and the current-sense resistor.

[0007] In one embodiment, the amplification module includes a differential amplifier, a first end of the differential amplifier is connected to the first end of the current-sensing resistor, a second end of the differential amplifier is connected to the second end of the current-sensing resistor, the first end of the differential amplifier is also grounded, and the second end of the differential amplifier is also connected to the output end of the differential amplifier.

[0008] In one embodiment, the amplification module further includes a resistance unit connected to the differential amplifier.

[0009] In one embodiment, the resistor unit includes a first resistor, a second resistor, a third resistor, and a fourth resistor;

[0010] The first resistor is arranged between the first end of the current-sense resistor and the first end of the differential amplifier;

[0011] The second resistor is arranged between the second end of the current-sense resistor and the second end of the differential amplifier;

[0012] The first terminal of the differential amplifier is grounded via a third resistor;

[0013] The fourth resistor is disposed between the second terminal of the differential amplifier and the output terminal of the differential amplifier.

[0014] In one embodiment, the internal resistance detection circuit further includes an electrical parameter measurement module, which is connected to at least one of the battery to be detected, the amplification module, and the current sensing resistor.

[0015] In one embodiment, the electrical parameter measurement module includes at least one of a current measurement unit, a voltage measurement unit, and a resistance measurement unit;

[0016] The current measuring unit is connected to the output end of the amplifying module;

[0017] The voltage measuring unit is connected to the battery to be tested;

[0018] The resistance measuring unit is connected to the current-sense resistor.

[0019] In one embodiment, the internal resistance detection circuit further includes a logic module; the logic module is connected to the current measurement unit, the voltage measurement unit, and the resistance measurement unit respectively.

[0020] In one embodiment, the logic module includes a multiplication unit, a subtraction unit, and a division unit;

[0021] The two input ends of the multiplication unit are connected to the current measurement unit and the resistance measurement unit respectively, and the output end of the multiplication unit is connected to the first input end of the subtraction unit; the second input end of the subtraction unit is connected to the voltage measurement unit, and the output end of the subtraction unit is connected to the first input end of the division unit; the second input end of the division unit is connected to the current measurement unit.

[0022] In a second aspect, the present application further provides an electronic device comprising an internal resistance detection circuit as described above.

[0023] The above-mentioned internal resistance detection circuit and electronic device include a battery access module, a current-sense resistor and an amplifier module. Since the battery access module includes a battery to be detected, and the battery to be detected and the current-sense resistor are connected in series, and the current-sense resistor is also connected to the input end of the amplifier module, the internal resistance of the battery to be detected can be determined more accurately by measuring the current flowing through the current-sense resistor. In addition, the internal resistance detection circuit has a simple structure and is easy to build, which improves the efficiency of determining the internal resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of an internal resistance detection circuit in one embodiment;

[0025] Figure 2 is a schematic diagram of yet another internal resistance detection circuit in one embodiment;

[0026] Figure 3is a schematic diagram of yet another internal resistance detection circuit in one embodiment;

[0027] Figure 4 is a schematic diagram of yet another internal resistance detection circuit in one embodiment;

[0028] Figure 5 FIG. 1 is a schematic diagram of an electronic device according to an embodiment.

[0029] Description of reference numerals:

[0030] 100 - internal resistance detection circuit, 101 - battery access module, 1011 - battery to be detected, 102 - current sensing resistor, 103 - amplification module, 1031 - differential amplifier, 1032 - resistance unit, 1032a - first resistor, 1032b - second resistor, 1032c - third resistor, 1032d - fourth resistor, 104 - switching element, 105 - electrical parameter measurement module, 1051 - current measurement unit, 1052 - voltage measurement unit, 1053 - resistance measurement unit, 106 - logic unit, 1061 - multiplication unit, 1062 - subtraction unit, 1063 - division unit, 200 - electronic device. DETAILED DESCRIPTION

[0031] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0032] The serial numbers assigned to the components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any order or technical meaning. The terms "connection" and "coupling" used in this application, unless otherwise specified, include both direct and indirect connections (couplings). In the description of this application, it should be understood that the terms "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," and the like, indicating positions or positional relationships, are based on the positions or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this application and simplify the description. They are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0033] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0035] In the following embodiments, although terms such as "first," "second," and the like may be used to describe various components, these components are not necessarily limited to the above terms. The above terms are used only to distinguish one component from another. It will also be understood that expressions used in the singular include plural expressions, unless the singular expression has a significantly different meaning in the context. In addition, in the following embodiments, it will also be understood that the terms "including" and / or "having" used herein indicate the presence of the stated features or components, but do not exclude the presence or addition of one or more other features or components.

[0036] In the following embodiments, when a layer, region, or element is “connected,” it can be interpreted that the layer, region, or element is not only directly connected but also connected via other constituent elements interposed therebetween. For example, when a layer, region, element, etc. is described as being connected or electrically connected, the layer, region, element, etc. can be connected or electrically connected not only directly or directly but also via another layer, region, element, etc. interposed therebetween.

[0037] It is understood that “at least one” refers to one or more, “a plurality” refers to two or more, and “at least a portion of an element” refers to a portion or all of an element.

[0038] It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] Figure 1 FIG. 1 is a schematic diagram of an internal resistance detection circuit in one embodiment, Figure 1 As shown, the internal resistance detection circuit 100 includes a battery access module 101 , a current sensing resistor 102 and an amplification module 103 .

[0041] The battery access module 101 includes a battery to be detected 1011 . The battery to be detected 1011 and a current-sensing resistor 102 are connected in series. The current-sensing resistor 102 is also connected to the input end of the amplification module 103 .

[0042] Battery 1011 to be tested refers to the battery whose internal resistance needs to be measured. For the convenience of subsequent description, the internal resistance of battery 1011 to be tested is denoted as Ri. Battery 1011 to be tested may include, but is not limited to, a lithium battery. Battery 1011 to be tested may include only a single cell or multiple cells, which is not a limitation in this embodiment.

[0043] The current-sense resistor 102 is used to measure the internal resistance Ri of the battery 1011 to be tested. The resistance value of the current-sense resistor 102 is known. For example, the user can measure the resistance value of the current-sense resistor 102 in advance, or the resistance value can be determined by the specification sheet of the current-sense resistor 102.

[0044] The input end of the amplifier module 103 is connected to the current-sense resistor 102 , and the output end of the amplifier module 103 is used to output the current I2 flowing through the current-sense resistor 102 . In other words, the amplifier module 103 is used to determine the current I2 flowing through the current-sense resistor 102 .

[0045] The amplifying module 103 includes but is not limited to a differential amplifier 1031 , a common-emitter amplifier or an operational amplifier, but the present embodiment is not limited thereto.

[0046] For example, a user can use a measuring device, such as a multimeter, to measure the voltage V1 of the battery to be tested 1011 when it is not connected to the internal resistance detection circuit 100, and then connect the battery to be tested 1011 to the internal resistance detection circuit 100. Since the battery to be tested 1011 and the current-sense resistor 102 are connected in series, a voltage drop will occur across the current-sense resistor 102, and the current I2 flowing through the current-sense resistor 102 can be intercepted by the amplification module 103. Furthermore, the user can use the measuring device to obtain the current I2 flowing through the current-sense resistor 102 output by the amplification module 103. After that, the user can use Ohm's law to calculate the internal resistance Ri of the battery to be tested 1011 by Ri = (V1-R1×I2) / I2. Where R1 represents the resistance value of the current-sense resistor 102.

[0047] The above-mentioned internal resistance detection circuit 100 includes a battery access module 101, a current-sense resistor 102 and an amplification module 103. Since the battery access module 101 includes a battery to be detected 1011, and the battery to be detected 1011 and the current-sense resistor 102 are connected in series, and the current-sense resistor 102 is also connected to the input end of the amplification module 103, the internal resistance of the battery to be detected 1011 can be determined more accurately by measuring the current flowing through the current-sense resistor 102. In addition, the internal resistance detection circuit 100 has a simple structure and is easy to build, which improves the efficiency of determining the internal resistance.

[0048] Figure 2 FIG. 1 is a schematic diagram of another internal resistance detection circuit in an embodiment, Figure 2 As shown, in an exemplary embodiment, the internal resistance detection circuit 100 optionally further includes a switch element 104, which is connected in series between the battery to be detected 1011 and the current-sense resistor 102. The switch element 104 includes, but is not limited to, a mechanical switch, an electronic switch, a touch switch, a button, a dip switch, etc., and this embodiment is not limited thereto.

[0049] In this way, the switch element 104 can be used to control whether the battery to be tested 1011 is connected to the internal resistance detection circuit 100. For example, when the switch element 104 is in the open state, the battery to be tested 1011 can be controlled not to be connected to the internal resistance detection circuit 100, and when the switch element 104 is in the closed state, the battery to be tested 1011 can be controlled to be connected to the internal resistance detection circuit 100.

[0050] Continuing with the above example, the user can first disconnect the switch element 104 and measure the voltage V1 across the battery to be tested 1011 using a measuring device. Then, the user can close the switch element 104 to connect the battery to be tested 1011 to the internal resistance detection circuit 100. The user can then obtain the current I2 flowing through the current-sense resistor 102 intercepted by the amplification module 103 using the measuring device to calculate the internal resistance Ri of the battery to be tested 1011 using Ri = (V1 - R1 × I2) / I2.

[0051] In the above embodiment, since the internal resistance detection circuit 100 further includes a switch element 104, the switch element 104 is connected in series between the battery to be detected 1011 and the current-sense resistor 102. Therefore, the state of the internal resistance detection circuit 100 can be quickly switched through the switch element 104 to efficiently determine the internal resistance of the battery to be detected 1011.

[0052] Figure 3 FIG. 1 is a schematic diagram of another internal resistance detection circuit in an embodiment, Figure 3 As shown, in an exemplary embodiment, optionally, the amplification module 103 includes a differential amplifier 1031, a first end of the differential amplifier 1031 is connected to the first end of the current-sensing resistor 102, a second end of the differential amplifier 1031 is connected to the second end of the current-sensing resistor 102, the first end of the differential amplifier 1031 is also grounded, and the second end of the differential amplifier 1031 is also connected to the output end of the differential amplifier 1031.

[0053] It should be noted that Figure 3 The battery access module 101 shown in FIG. 1 is an equivalent circuit of a battery to be detected 1011 , and the battery to be detected 1011 includes an internal resistance Ri of the battery to be detected.

[0054] In the above embodiment, since the amplification module 103 includes the differential amplifier 1031, the first end of the differential amplifier 1031 is connected to the first end of the current-sensing resistor 102, the second end of the differential amplifier 1031 is connected to the second end of the current-sensing resistor 102, the first end of the differential amplifier 1031 is also grounded, and the second end of the differential amplifier 1031 is also connected to the output end of the differential amplifier 1031. In this way, the differential amplifier 1031 can amplify the current I2 flowing through the current-sensing resistor 102.

[0055] Please continue to refer to Figure 3 In an exemplary embodiment, the amplification module 103 optionally further includes a resistor unit 1032, which is connected to the differential amplifier 1031. The resistor unit 1032 is used to improve the performance of the differential amplifier 1031, that is, to improve the amplification effect of the differential amplifier 1031. For example, the resistor unit 1032 can be used for filtering or reducing distortion.

[0056] In the above embodiment, since the amplifying module 103 further includes the resistance unit 1032 and the resistance unit 1032 is connected to the differential amplifier 1031 , it is beneficial to improve the amplification efficiency of the differential amplifier 1031 .

[0057] Please continue to refer to Figure 3In an exemplary embodiment, optionally, the resistance unit 1032 includes a first resistor 1032a, a second resistor 1032b, a third resistor 1032c, and a fourth resistor 1032d.

[0058] The first resistor 1032a is disposed between the first end of the current-sense resistor 102 and the first end of the differential amplifier 1031. The second resistor 1032b is disposed between the second end of the current-sense resistor 102 and the second end of the differential amplifier 1031. The first end of the differential amplifier 1031 is grounded via the third resistor 1032c. The fourth resistor 1032d is disposed between the second end of the differential amplifier 1031 and the output end of the differential amplifier 1031.

[0059] Further optionally, the resistance of the first resistor 1032a is equal to the resistance of the second resistor 1032b, and the resistance of the third resistor 1032c is equal to the resistance of the fourth resistor 1032d. Furthermore, the amplification factor of the differential amplifier 1031 can be determined based on the first resistor 1032a and the third resistor 1032c. For example, the amplification factor of the differential amplifier 1031 is equal to the quotient of the resistance of the third resistor 1032c and the first resistor 1032a.

[0060] In one embodiment, please refer to Figure 3 For example, if the battery to be tested is a lithium battery, the user can first connect the lithium battery to the battery access module 101 and, before closing the switch element 104, use a high-precision voltage and current measuring device (such as a high-precision multimeter) to test the lithium battery voltage to V1. The user then closes the switch element 104 and uses the amplification module 103 to measure the current across the current-sense resistor 102 to I2. Furthermore, the user can use Ohm's law to calculate V2 = I2 × R1, and thus the lithium battery's internal resistance Ri = (V1 - V2) / I2. V2 is the voltage across the current-sense resistor 102.

[0061] Figure 4 FIG. 1 is a schematic diagram of another internal resistance detection circuit in an embodiment, Figure 4 As shown, in an exemplary embodiment, optionally, the internal resistance detection circuit 100 further includes an electrical parameter measurement module 105 .

[0062] The electrical parameter measurement module 105 is connected to at least one of the battery to be tested 1011, the amplification module 103, and the current-sense resistor 102. The electrical parameter measurement module can be used to measure at least one of the voltage V1 of the battery to be tested 1011 when not connected to the internal resistance detection circuit 100, the current I2 output by the amplification module 103 flowing through the current-sense resistor 102, and the resistance value of the current-sense resistor 102. For example, the electrical parameter measurement module can be a multimeter.

[0063] In the above embodiment, since the internal resistance detection circuit 100 also includes an electrical parameter measurement module 105, the electrical parameter measurement module 105 is connected to at least one of the battery to be detected 1011, the amplification module 103 and the current sensing resistor 102. Therefore, the electrical parameters required for determining the internal resistance of the battery to be detected 1011 can be measured quickly and efficiently through the electrical parameter measurement mode.

[0064] Please continue to refer to Figure 4 In an exemplary embodiment, optionally, the electrical parameter measurement module 105 includes at least one of a current measurement unit 1051 , a voltage measurement unit 1052 , and a resistance measurement unit 1053 .

[0065] The current measuring unit 1051 is connected to the output terminal of the amplifying module 103 and is used to measure the current I2 output by the amplifying module 103 and flowing through the current sensing resistor 102. The current measuring unit 1051 may include but is not limited to an ammeter.

[0066] The voltage measuring unit 1052 is connected to the battery to be tested 1011 and is used to measure the voltage V1 of the battery to be tested 1011 when it is not connected to the internal resistance detection circuit 100. The voltage measuring unit 1052 includes but is not limited to a voltmeter.

[0067] The resistance measuring unit 1053 is connected to the current-sense resistor 102 and is used to measure the resistance of the current-sense resistor 102. The resistance measuring unit 1053 includes but is not limited to an ohmmeter.

[0068] In one embodiment, optionally, the current measuring unit 1051 , the voltage measuring unit 1052 , and the resistance measuring unit 1053 may also be the same device, such as a multimeter.

[0069] In the above embodiment, since the electrical parameter measurement module 105 includes at least one of the current measurement unit 1051 , the voltage measurement unit 1052 and the resistance measurement unit 1053 , the electrical parameters required for determining the internal resistance of the battery 1011 to be tested can be accurately measured.

[0070] Please continue to refer to Figure 4 In an exemplary embodiment, optionally, the internal resistance detection circuit 100 further includes a logic module 106. The logic module 106 is connected to the current measurement unit 1051, the voltage measurement unit 1052, and the resistance measurement unit 1053 respectively.

[0071] In this way, through the logic module 106, the internal resistance Ri of the battery to be tested 1011 can be calculated using Ri=(V1-R1×I2) / I2 based on the current I2 flowing through the current-sense resistor 102 obtained by the current measuring unit 1051, the voltage V1 of the battery to be tested 1011 when it is not connected to the internal resistance detection circuit 100 obtained by the voltage measuring unit 1052, and the resistance value of the current-sense resistor 102 obtained by the resistance measuring unit 1053.

[0072] In the above embodiment, since the internal resistance detection circuit 100 further includes a logic module 106, and the logic module 106 is respectively connected to the current measurement unit 1051, the voltage measurement unit 1052, and the resistance measurement unit 1053, the internal resistance Ri of the battery to be detected 1011 can be efficiently determined through the logic module 106, thereby reducing dependence on manual labor and improving work efficiency.

[0073] Please continue to refer to Figure 4 In an exemplary embodiment, optionally, the logic module 106 includes a multiplication unit 1061 , a subtraction unit 1062 , and a division unit 1063 .

[0074] The two input terminals of the multiplication unit 1061 are connected to the current measurement unit 1051 and the resistance measurement unit 1053, respectively, and the output terminal of the multiplication unit 1061 is connected to the first input terminal of the subtraction unit 1062. In this way, the output terminal of the multiplication unit 1061 can obtain the result of R1×I2, and the result of R1×I2 is input to the second input terminal of the subtraction unit 1062.

[0075] The second input terminal of the subtraction unit 1062 is connected to the voltage measurement unit 1052, and the output terminal of the subtraction unit 1062 is connected to the first input terminal of the division unit 1063. In this way, the output terminal of the subtraction unit 1062 can obtain the result of V1-R1×I2, and the result of V1-R1×I2 is input to the second input terminal of the division unit 1063.

[0076] The second input terminal of the dividing unit 1063 is connected to the current measuring unit 1051 , so that the output terminal of the dividing unit 1063 can obtain the result of (V1-R1×I2) / I2, that is, the internal resistance Ri of the battery to be tested 1011 is determined.

[0077] In the above embodiment, since the logic module 106 includes the multiplication unit 1061, the subtraction unit 1062, and the division unit 1063, and the two input terminals of the multiplication unit 1061 are respectively connected to the current measurement unit 1051 and the resistance measurement unit 1053, the output terminal of the multiplication unit 1061 is connected to the first input terminal of the subtraction unit 1062; the second input terminal of the subtraction unit 1062 is connected to the voltage measurement unit 1052, and the output terminal of the subtraction unit 1062 is connected to the first input terminal of the division unit 1063; and the second input terminal of the division unit 1063 is connected to the current measurement unit 1051, the internal resistance Ri of the battery to be tested 1011 can be determined based on Ri=(V1-R1×I2) / I2 through the logic module 106.

[0078] In an exemplary embodiment, the internal resistance detection circuit 100 may optionally further include a display module (not shown). The display module is connected to the output terminal of the logic module 106. In this way, the display module can display the internal resistance Ri of the battery to be detected 1011 determined by the logic module 106. The display module may include, but is not limited to, various display screens or digital tubes, and this embodiment does not limit this.

[0079] Figure 5 FIG. 1 is a schematic diagram of an electronic device in one embodiment, such as Figure 5 As shown, the electronic device 200 includes any one of the internal resistance detection circuits 100 described above.

[0080] In an exemplary embodiment, the electronic device 200 may optionally include a housing (not shown), and the internal resistance detection circuit 100 may be disposed inside the housing. It should be noted that this embodiment does not limit the material, shape, etc. of the housing.

[0081] In an exemplary embodiment, optionally, the electronic device 200 may further include a display device (not shown in the figure), which is used to display the internal resistance Ri of the battery 1011 to be tested.

[0082] In an exemplary embodiment, optionally, the display device may be disposed on the housing, or disposed outside the housing.

[0083] In summary, the circuit design provided in this application is simple, and the voltage, current and other information under different states can be measured by an external multimeter. The internal resistance of the lithium battery can be obtained quickly and conveniently to verify the internal resistance in the specification sheet, and the battery series and parallel connection can be designed according to the actual internal resistance of the battery for subsequent applications.

[0084] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0085] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. An internal resistance detection circuit, characterized in that: The internal resistance detection circuit (100) comprises a battery access module (101), a current-sensing resistor (102), and an amplification module (103); the battery access module (101) comprises a battery to be detected (1011), the battery to be detected (1011) and the current-sensing resistor (102) are connected in series, and the current-sensing resistor (102) is also connected to the input end of the amplification module (103).

2. The internal resistance detection circuit according to claim 1, characterized in that: The internal resistance detection circuit (100) further includes a switch element (104), wherein the switch element (104) is connected in series between the battery to be detected (1011) and the current detection resistor (102).

3. The internal resistance detection circuit according to claim 1, wherein: The amplification module (103) comprises a differential amplifier (1031), wherein a first end of the differential amplifier (1031) is connected to a first end of the current-sensing resistor (102), a second end of the differential amplifier (1031) is connected to a second end of the current-sensing resistor (102), the first end of the differential amplifier (1031) is also grounded, and the second end of the differential amplifier (1031) is also connected to an output end of the differential amplifier (1031).

4. The internal resistance detection circuit according to claim 3, characterized in that: The amplification module (103) further includes a resistance unit (1032), and the resistance unit (1032) is connected to the differential amplifier (1031).

5. The internal resistance detection circuit according to claim 4, characterized in that: The resistance unit (1032) includes a first resistor (1032a), a second resistor (1032b), a third resistor (1032c) and a fourth resistor (1032d); The first resistor (1032a) is arranged between the first end of the current detection resistor (102) and the first end of the differential amplifier (1031); The second resistor (1032b) is arranged between the second end of the current detection resistor (102) and the second end of the differential amplifier (1031); The first end of the differential amplifier (1031) is grounded via the third resistor (1032c); The fourth resistor (1032d) is arranged between the second end of the differential amplifier (1031) and the output end of the differential amplifier (1031).

6. The internal resistance detection circuit according to any one of claims 1 to 5, characterized in that: The internal resistance detection circuit (100) further comprises an electrical parameter measurement module (105), wherein the electrical parameter measurement module (105) is connected to at least one of the battery to be detected (1011), the amplification module (103), and the current detection resistor (102).

7. The internal resistance detection circuit according to claim 6, characterized in that: The electrical parameter measurement module (105) includes at least one of a current measurement unit (1051), a voltage measurement unit (1052), and a resistance measurement unit (1053); The current measuring unit (1051) is connected to the output end of the amplifying module (103); The voltage measuring unit (1052) is connected to the battery to be tested (1011); The resistance measuring unit (1053) is connected to the current-sensing resistor (102).

8. The internal resistance detection circuit according to claim 7, characterized in that: The internal resistance detection circuit (100) further includes a logic module (106); the logic module (106) is respectively connected to the current measurement unit (1051), the voltage measurement unit (1052), and the resistance measurement unit (1053).

9. The internal resistance detection circuit according to claim 8, characterized in that: The logic module (106) includes a multiplication unit (1061), a subtraction unit (1062) and a division unit (1063); The two input ends of the multiplication unit (1061) are respectively connected to the current measurement unit (1051) and the resistance measurement unit (1053); the output end of the multiplication unit (1061) is connected to the first input end of the subtraction unit (1062); the second input end of the subtraction unit (1062) is connected to the voltage measurement unit (1052); the output end of the subtraction unit (1062) is connected to the first input end of the division unit (1063); and the second input end of the division unit (1063) is connected to the current measurement unit (1051).

10. An electronic device, characterized in that: The electronic device (200) comprises the internal resistance detection circuit (100) according to any one of claims 1 to 9.

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