Battery internal resistance measurement system and method

Abstract

A battery internal resistance measuring system is used for measuring an internal resistance value of a battery under test, the battery under test includes a first end and a second end, and the first end has an oxide layer; the battery internal resistance measuring system includes: a power supply device including a first connection terminal and a second connection terminal, the first connection terminal and the second connection terminal are respectively used to be electrically connected with the first end and the second end of the battery under test, wherein one of the first connection terminal and the second connection terminal has a probe; wherein the probe is used to contact the oxide layer of the battery under test, and the battery under test is powered through the probe, so that electrons can pass through the oxide layer to reach the first end, thereby generating a tunneling current; a data acquisition device electrically connected with the battery under test and the power supply device to form a loop; wherein the data acquisition device measures a current value of the tunneling current and a voltage value of the battery under test after the tunneling current is generated; and a computing device communicatively connected with the power supply device and / or the data acquisition device, the computing device calculates the internal resistance value of the battery under test according to the voltage value and the current value.

Description

Technical Field

[0001] This invention relates to a battery internal resistance measurement system and method, and more particularly to a battery internal resistance measurement system and method that can measure battery internal resistance without first removing oxides from the battery end cap. Specifically, it relates to a battery internal resistance measurement system and method utilizing the field emission (RE) principle, also known as the carrier tunneling principle. Background Technology

[0002] Currently, after battery assembly, oxides easily form on the battery end caps. This oxide (which can be considered an insulating layer) hinders contact resistance, making it difficult for users to accurately measure the battery's internal resistance. While users can remove the oxides using lasers, etching, or other methods before measuring the battery's internal resistance, this method is cumbersome and inefficient. Therefore, there is a need for a battery internal resistance measurement system and method that is simpler to operate and more efficient. Preferably, there is a need for a battery internal resistance measurement system and method that can measure the battery's internal resistance without first removing the oxides above the battery end caps. Summary of the Invention

[0003] To address the aforementioned problems, one aspect of this invention is to provide a battery internal resistance measurement system and method that is simple to operate and highly efficient. Another aspect of this invention is to provide a battery internal resistance measurement system and method that can measure battery internal resistance without first removing oxide from the battery end cap. A further aspect of this invention is to provide a battery internal resistance measurement system and method that utilizes the field emission (RE) principle, also known as the carrier tunneling principle.

[0004] Based on the aforementioned concept, the present invention provides a battery internal resistance measurement system for measuring the internal resistance value of a battery under test. The battery under test includes a first end and a second end, and the first end has an oxide layer. The battery internal resistance measurement system includes: a power supply device including a first connection terminal and a second connection terminal, the first connection terminal and the second connection terminal being respectively used for electrical connection with the first end and the second end of the battery under test, wherein one of the first connection terminal and the second connection terminal has a probe; wherein the probe is used to contact the... The probe supplies power to the battery under test through the oxide layer, allowing electrons to pass through the oxide layer to reach the first end, thereby generating a tunneling current; a data acquisition device is electrically connected to the battery under test and the power supply device to form a loop; wherein, after the tunneling current is generated, the data acquisition device measures a current value of the tunneling current and a voltage value of the battery under test; and a computing device is communicatively connected to the power supply device and / or the data acquisition device, and the computing device calculates the internal resistance value of the battery under test based on the voltage value and the current value.

[0005] In one preferred embodiment of the invention, the probe has a blunt end and a sharp end, and the power supply device provides an electron flow along the direction from the blunt end of the probe to the sharp end.

[0006] In one preferred embodiment of the present invention, the first end is a positive terminal, the second end is a negative terminal, and the power supply device provides an electron flow along the direction from the positive terminal to the negative terminal of the battery under test.

[0007] In one preferred embodiment of the present invention, the power supply device provides a test current to the battery under test, the test current flowing from the negative terminal to the positive terminal of the battery under test.

[0008] In one preferred embodiment of the present invention, the probe has a blunt end and a sharp end; wherein the power supply device provides a test current to the battery under test, the test current flowing from the sharp end of the probe to the blunt end.

[0009] In one preferred embodiment of the present invention, the power supply device provides a voltage to the battery under test such that the potential of the first end is lower than the potential of the second end.

[0010] In one preferred embodiment of the present invention, the power supply device applies a detection voltage to the battery under test via the probe, so that the battery under test undergoes a tunneling effect and generates a tunneling current.

[0011] In one preferred embodiment of the present invention, the first end of the battery under test is a positive terminal, the second end of the battery under test is a negative terminal, the probe of the first connection terminal of the power supply device is connected to the positive terminal, and the second connection terminal of the power supply device is connected to the negative terminal.

[0012] In one preferred embodiment of the present invention, the power supply device provides a detection current in the circuit, and the data acquisition device measures the voltage across the battery under test; wherein the calculation device calculates the internal resistance value of the battery under test based on the detection current and the voltage across the circuit.

[0013] In one preferred embodiment of the present invention, the detection current increases with the increase of the thickness of the oxide layer.

[0014] In one preferred embodiment of the present invention, the power supply device provides a detection voltage in the circuit, and the data acquisition device measures a current in the circuit; wherein the calculation device calculates the internal resistance value of the battery under test based on the detection voltage and the current.

[0015] In one preferred embodiment of the present invention, the detection voltage increases with the increase of the thickness of the oxide layer.

[0016] According to the present invention, a method for measuring the internal resistance of a battery is further provided for measuring the internal resistance value of a battery under test, the battery under test comprising a first end and a second end, wherein the first end has an oxide layer; the method for measuring the internal resistance of a battery comprises the following steps: connecting a first connection terminal and a second connection terminal of a power supply device to the first end and the second end of the battery under test, respectively, wherein one of the first connection terminal and the second connection terminal has a probe, and the probe of the power supply device contacts the oxide layer of the battery under test; and transmitting a data... The data acquisition device is connected to the battery under test and the power supply device; a computing device is communicatively connected to the power supply device and / or the data acquisition device; the power supply device supplies power to the battery under test through the probe, allowing electrons to pass through the oxide layer to reach the first end, thereby generating a tunneling current, wherein the power supply device is electrically connected to the data acquisition device and the battery under test to form a loop; the data acquisition device measures a current value of the tunneling current and a voltage value of the battery under test; and the computing device calculates the internal resistance value of the battery under test based on the voltage value and the current value.

[0017] In one preferred embodiment of the present invention, the probe has a blunt end and a sharp end, and the battery internal resistance measurement method further includes the following steps: providing an electron flow from the blunt end of the probe to the sharp end of the probe.

[0018] In a preferred embodiment of the present invention, the first end is a positive terminal and the second end is a negative terminal. The battery internal resistance measurement method further includes the following steps: providing an electron flow from the positive terminal to the negative terminal of the battery under test by the power supply device.

[0019] In a preferred embodiment of the present invention, the battery internal resistance measurement method further includes the following steps: the power supply device provides a test current to the battery under test along the direction from the negative terminal to the positive terminal of the battery under test.

[0020] In a preferred embodiment of the present invention, the probe has a blunt end and a sharp end; wherein the battery internal resistance measurement method further includes the following steps: the power supply device provides a test current to the battery under test along the direction from the sharp end of the probe to the blunt end.

[0021] In a preferred embodiment of the present invention, the battery internal resistance measurement method further includes the following steps: providing a voltage to the battery under test by the power supply device, such that the potential of the first end is lower than the potential of the second end.

[0022] In a preferred embodiment of the present invention, the battery internal resistance measurement method further includes the following steps: the power supply device applies a detection voltage to the battery under test through the probe, so that the battery under test undergoes a tunneling effect and generates a tunneling current.

[0023] In a preferred embodiment of the present invention, the first end of the battery under test is a positive terminal, the second end of the battery under test is a negative terminal, and the battery internal resistance measurement method further includes the following steps: connecting the probe of the first connection terminal of the power supply device to the positive terminal, and connecting the second connection terminal of the power supply device to the negative terminal.

[0024] In a preferred embodiment of the present invention, the battery internal resistance measurement method further includes the following steps: the power supply device provides a detection current in the circuit; the data acquisition device measures the cross voltage in the circuit; and the calculation device calculates the internal resistance value of the battery under test based on the detection current and the cross voltage.

[0025] In a preferred embodiment of the present invention, the battery internal resistance measurement method further includes the following steps: the power supply device provides a detection voltage in the circuit; the data acquisition device measures a current in the circuit; and the calculation device calculates the internal resistance value of the battery under test based on the detection voltage and the current.

[0026] In a preferred embodiment of the present invention, the battery internal resistance measurement method further includes the following step: the detection voltage increases with the increase of the thickness of the oxide layer.

[0027] The foregoing aspects and other aspects of the present invention will become clearer from the following detailed description of non-limiting specific embodiments and with reference to the accompanying drawings. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a specific embodiment of the battery internal resistance measurement system of the present invention.

[0029] Figure 2a This is a schematic diagram of the potential energy distribution between the probe and the battery under test, and the tunneling effect, in a specific embodiment of the battery internal resistance measurement system of the present invention after applying an electric field in a specific direction.

[0030] Figure 2b for Figure 2a The equivalent circuit diagram.

[0031] Figure 3 This is a side view of the probe of a power supply device according to one specific embodiment of the present invention.

[0032] Figure 4 This is a top view of the probe of a power supply device according to one specific embodiment of the present invention.

[0033] Figure 5 This is a schematic diagram of a specific embodiment for calculating the internal resistance value of a battery under test.

[0034] Figure 6 This is a flowchart of a specific embodiment of the battery internal resistance measurement method of the present invention.

[0035] Figure 7 This is a schematic diagram of the potential energy distribution between the probe and the battery under test in a battery internal resistance measurement system according to a specific embodiment of the present invention after applying an electric field in a specific direction. Detailed Implementation

[0036] Please see Figure 1 The illustration shows a schematic diagram of a specific embodiment of the battery internal resistance measurement system according to the present invention. Figure 1 In the illustrated embodiment, the battery internal resistance measurement system 100 can be used to measure the internal resistance value of a battery under test 900. The battery under test 900 includes a first end 910 and a second end 920. In one specific embodiment, the first end 910 of the battery under test 900 has an oxide layer. The formation of the oxide layer may be due to oxidation of the first end 910, but is not limited thereto. The battery internal resistance measurement system 100 may include a power supply device 110, a data acquisition device 120, and a computing device 130.

[0037] The power supply device 110 includes a first connection terminal 112 and a second connection terminal 114. At least one of the first and second connection terminals has a probe. In one specific embodiment, the first connection terminal 112 has a probe 116. During measurement, the first connection terminal 112 and the second connection terminal 114 can be electrically connected to the first end 910 and the second end 920 of the battery under test 900, respectively. In one specific embodiment, the probe 116 of the first connection terminal 112 is electrically connected to the first end 910, and the second connection terminal 114 is electrically connected to the second end 920. Figure 1 As shown in the image.

[0038] The data acquisition device 120 can be electrically connected to the battery under test 900 and the power supply device 110 to form a loop (i.e., the power supply device 110, the data acquisition device 120, and the battery under test 900 form a loop). In one specific embodiment, as... Figure 1 As shown, the power supply device 110 is connected in parallel with the battery under test 900, and the data acquisition device 120 is connected in series with the battery under test 900. It should be understood that the series connection described here does not mean that the data acquisition device 120 and the battery under test 900 must be directly connected. In fact, if other electronic components (such as resistors or other measuring devices, but not limited to this) are connected between the data acquisition device 120 and the battery under test 900, thus indirectly connecting them in series, this also constitutes a form of series connection. It should be understood that the battery internal resistance measurement system 100 can choose to use either a two-terminal method or a four-terminal method to measure the internal resistance value of the battery under test 900, depending on the requirements, but is not limited to this.

[0039] The probe 116 of the power supply device 110 can contact the oxide layer of the battery 900 under test, and the power supply device 110 can supply power to the battery 900 under test through the probe 116. It should be understood that the probe 116 is made of metal, and preferably, the probe 116 may have a pointed shape. In one embodiment, the probe 116 of the power supply device 110 is at least partially made of copper (e.g., the probe 116 of the power supply device 110 may be made of copper, or the portion of the probe 116 that contacts the oxide layer may be made of copper, or the probe 116 of the power supply device 110 may contain copper). In one embodiment, the probe 116 may have a pointed tip 116a and a blunt tip 116b, such as... Figure 1As shown, probe 116 contacts the oxide layer of the battery under test 900 with its tip 116a. The shape of the probe tip 116 has a significant impact on field emission. When the metal surface has a sharp point or minute protrusions, the electric field strength at the tip 116a is greatly enhanced; this is known as the tip effect or field enhancement effect. Thus, at the tip of probe 116, applying a voltage in a specific direction, even a relatively low voltage, will trigger tunneling or field emission due to localized electric field concentration.

[0040] One of the first and second ends of the battery under test is the positive terminal, and the other is the negative terminal. In one specific embodiment, the first end 910 of the battery under test 900 is the positive terminal, and the second end 920 is the negative terminal. In one specific embodiment, the first end 910 and the second end 920 are opposite to each other. It should be understood that when the positive terminal of the battery under test 900 has an oxide layer and cannot conduct, a specific electric field can be applied to the probe 116 of the power supply device to induce a tunneling effect and thus conduct. Specifically, the tip 116a of the probe 116 can contact the oxide layer of the positive terminal and provide a specific voltage, current, or electron flow to the battery under test 900, so that electrons can leave the tip of the probe, pass through the oxide layer, and reach the battery end under the oxide layer, generating a tunneling current. The battery under test 900, the power supply device 110, and the data acquisition unit 120 are electrically connected to each other to form a circuit.

[0041] While a specific embodiment has been disclosed above, it should be understood that the present invention primarily involves contacting the oxide layer of the battery under test with a probe of a power supply device, and supplying power to the battery under test through the probe so that electrons can pass through the oxide layer to reach the battery end below the oxide layer, thereby generating a tunneling current. Under this premise, if the negative terminal (i.e., the second end 920) of the battery under test 900 has an oxide layer, the probe 116 of the power supply device 110 can also contact the negative terminal of the battery under test 900, and apply an external electric field (including applying voltage, providing current, electron flow, etc.) in a specific direction to cause the target battery 900 to undergo a tunneling effect.

[0042] In one embodiment, the probe 116 has a blunt end 116b and a pointed end 116a. The power supply device 110 can provide an electron flow to the battery 900 under test along the direction from the blunt end 116b of the probe 116 to the pointed end 116a. In one embodiment, the first end 910 of the battery 900 under test is a positive terminal, and the second end 920 of the battery 900 under test is a negative terminal. The power supply device 110 can provide an electron flow along the direction from the positive terminal to the negative terminal of the battery 910 under test.

[0043] In one specific embodiment, the first end 910 of the battery under test 900 is a positive terminal, and the second end 920 of the battery under test 900 is a negative terminal. The power supply device 110 can provide a test current in a specific direction to the circuit formed by the battery under test 900 and / or the battery under test 900, the power supply device 110, and the data acquisition device 120. The direction of the test current is from the negative terminal of the battery under test 900 to the positive terminal.

[0044] In one specific embodiment, the probe 116 has a blunt end 116b and a sharp end 116a. The power supply device 110 can provide a test current to the circuit formed by the battery under test 900 and / or the battery under test 900, the power supply device 110 and the data acquisition device 120, and the test current flows from the sharp end 116a of the probe 116 to the blunt end 116b of the probe 116.

[0045] In one embodiment, the power supply device 110 can provide a voltage to the battery under test 900, with the potential of the first end 910 being lower than the potential of the second end 920. In another embodiment, the power supply device 110 can apply a detection voltage to the battery under test 900 via a probe 116, such that the potential of the first end 910 of the battery under test is lower than the potential of the second end 920. Applying a voltage in a specific direction can generate an electron flow in a specific direction. For example, the electric field formed at the tip 116a of the probe 116 can cause electrons to rearrange and accumulate at the probe tip, eventually detaching from the probe tip surface and passing through the oxide layer, resulting in a tunneling effect and generating a tunneling current.

[0046] In one specific embodiment, the battery internal resistance measurement system 100 may include a carrier device for carrying the battery 900 under test. When an electric field of a specific direction is to be applied, the placement direction of the battery under test in the carrier device can be changed, for example, by inverting it vertically or reversing it horizontally, or by changing the connection direction between the battery under test and the power supply device. For example, the first end of the battery under test, which was originally connected to the first connection terminal of the power supply device, can be changed to be connected to the second connection terminal of the power supply device. Under the premise that the other wiring and power supply settings remain unchanged, the purpose of forming an electric field, voltage, current, or electron flow of a specific direction can be achieved. In one specific embodiment, the battery under test 900 is placed in the carrier device such that the probe 116 of the first connection terminal 112 of the power supply device 110 is connected to, abuts against, or contacts the positive terminal of the battery under test 900. Figure 1 In the middle, the positive terminal can be the first end 910), the second connection terminal 114 of the power supply device 110 is connected to, abuts against or contacts the negative terminal of the battery under test 900 (in Figure 1 In the middle, the negative terminal can be the second end 920). When tunneling occurs, the tunneling current will flow along the positive terminal of the battery under test (in Figure 1In the process, the positive terminal (the first end 910) can flow towards the probe 116 of the power supply device 110, or it can move from the negative terminal of the battery under test to the positive terminal. The electron flow will move along the probe towards the positive terminal of the battery under test.

[0047] Please also refer to Figure 2a as well as Figure 2b , Figure 2a This is a schematic diagram illustrating the potential energy distribution between the probe and the battery under test, and the tunneling effect, in a specific embodiment of the battery internal resistance measurement system of the present invention after applying an electric field in a specific direction. Figure 2b for Figure 2a The equivalent circuit diagram. For example... Figure 2a as well as Figure 2b In the embodiment shown, when the probe 216 of the power supply device contacts the oxide layer 912 of the first end 910 of the battery under test 900 and applies an electric field in a specific direction to the battery under test 900, specifically by applying a current (e.g., the aforementioned detection current), electron flow, voltage (e.g., the aforementioned detection voltage) in a specific direction, or when the battery under test is placed in the carrier device in a specific direction, the electric field will cause the charges on the surface of the probe tip 216a to rearrange and stack on the tip, helping the electrons 800 to detach from the surface of the probe tip 216a and pass through the oxide layer 912 of the first end 910, which was originally impassable, to reach the first end 910 of the battery under test, resulting in a tunneling effect. Figure 2b That is, to illustrate the tunneling effect (or field emission effect) after it occurs. Figure 2a The equivalent circuit diagram shows that once the tunneling effect occurs, the battery under test (BUT) and the battery internal resistance measurement system form a loop. Vd is the voltage across the BUT 900, Id is the current generated after the tunneling effect occurs, Rin is the internal resistance of the BUT 900, and RL is the load in the loop (including the power supply device, data acquisition device, etc., which are all simplified as loads). The electron flow direction 250 can be from the blunt end 216b of the probe to the tip 216a, from the positive terminal of the BUT 900 to the negative terminal, or from the first end 910 of the BUT 900 to the second end 920. The current direction 260 can be from the tip 216a of the probe to the blunt end 216b, from the negative terminal of the BUT 900 to the positive terminal, or from the second end 920 of the BUT 900 to the first end 910.

[0048] Regarding the tunneling effect (or field emission effect), field emission typically occurs when charge is concentrated at the negative terminal (cathode). This is because field emission is primarily generated by the high-intensity electric field on the cathode. This strong electric field can create localized field enhancement at the tips or protrusions on the cathode surface, allowing electrons to pass through the barrier layer. Simultaneously with the field enhancement, the barrier layer near the cathode (such as an oxide layer) is compressed (i.e., the thickness or height of the barrier layer decreases due to the electric field). This compression phenomenon makes it easier for electrons to pass through the barrier layer under the localized electric field.

[0049] Figure 3 A side view of the probe of a power supply device according to one specific embodiment of the present invention is shown. Figure 4 A top view illustrating the probe of a power supply device according to one specific embodiment of the present invention is provided. Figure 3 and Figure 4 The probe 340 of the power supply device may have a central portion 342 and an edge portion 344. The central portion 342 includes a plurality of needle-like structures, each needle-like structure including a tip 340a and a blunt end 340b. The tip 340a is a free end used to contact the surface of the object to be tested. The edge portion 344 includes a plurality of needle-like structures, each needle-like structure including a tip 340a and a blunt end 340b. The tip 340a is a free end used to contact the surface of the object to be tested. Preferably, the power supply device can provide voltage and current to the battery under test through the central portion 342 and / or the edge portion 344 of the probe 340, respectively. The probe of the power supply device may be, for example, a four-point probe or a four-terminal clamp probe, or the probe of the power supply device may be similar to a four-terminal clamp probe, but is not limited thereto.

[0050] The data acquisition device 120 can measure the current value of the tunneling current and the voltage value of the battery under test 900 after the tunneling current is generated. The computing device 130 can be communicatively connected to the power supply device 110 and / or the data acquisition device 120. The computing device 130 can calculate the internal resistance value of the battery under test 900 based on the voltage and current values ​​measured by the data acquisition device 120. In a specific embodiment, the power supply device 110 can provide a detection current in the circuit formed by the power supply device 110, the data acquisition device 120, and the battery under test 900 (the power supply device 110 providing a detection current to the battery under test 900 can also be regarded as a practice of the power supply device 110 providing a detection current in the circuit formed by the power supply device 110, the data acquisition device 120, and the battery under test 900). The data acquisition device 120 can measure the cross voltage in the circuit (the cross voltage can be, for example, the cross voltage of the battery under test 900), and the calculation device 130 can calculate the internal resistance value of the battery under test 900 based on the detection current and cross voltage measured by the data acquisition device 120.

[0051] Please see Figure 5The illustration shows a schematic diagram of a specific embodiment for calculating the internal resistance value of the battery under test, such as... Figure 5 In the illustrated embodiment, when the power supply device provides power to the battery under test 900, causing the battery under test 900 to tunnel, the battery under test will have a voltage V and a current I will flow through the battery under test 900. At this time, the calculation device of the battery internal resistance measurement system can calculate the internal resistance value Rin of the battery under test 900 based on the voltage V and the current I. Wherein, the voltage V is equal to the positive terminal potential V+ of the battery under test 900 minus the negative terminal potential V-. The internal resistance value Rin of the battery under test 900 is equal to the voltage V divided by the current I. The calculation method is as follows (R1 is the positive terminal resistance, R2 is the negative terminal resistance):

[0052] V = V+ - V- = I * (R1 + Rin - R2)

[0053] V / I = Rin

[0054] The detection current applied by the power supply device 110 can be either alternating current (AC) or direct current (DC). In one specific embodiment, the power supply device 110 provides DC current, and once the tunneling effect occurs, the resulting tunneling current is DC current. Thus, the user can calculate the internal resistance of the battery 900 under test based on the applied detection current value and the trans-voltage value (or voltage value) measured by the data acquisition device 120. For example, the user can divide the trans-voltage value measured by the data acquisition device 120 by the detection current value to calculate the internal resistance of the battery 900 under test.

[0055] In one specific embodiment, the power supply device 110 can provide a detection voltage to the circuit formed by the power supply device 110, the data acquisition device 120, and the battery under test 900 (the power supply device 110 providing a detection voltage to the battery under test 900 can also be considered as a practical way for the power supply device 110 to provide a detection voltage to the circuit formed by the power supply device 110, the data acquisition device 120, and the battery under test 900), thereby generating a tunneling current. The data acquisition device 120 can measure the current in the circuit (the current can be, for example, the current flowing through the battery under test 900 or the current flowing through the data acquisition device 120), and the calculation device 130 can calculate the internal resistance value of the battery under test 900 based on the detection voltage and current measured by the data acquisition device 120.

[0056] The detection voltage applied by the power supply device 110 can be either AC or DC. In one specific embodiment, the detection voltage applied by the power supply device 110 is a DC voltage, and the resulting tunneling current after the tunneling effect occurs is a DC current. Thus, the user can calculate the internal resistance of the battery 900 under test based on the applied detection voltage value and the current value measured by the data acquisition device 120. For example, the user can divide the detection voltage value by the current value measured by the data acquisition device 120 to calculate the internal resistance of the battery 900 under test.

[0057] Preferably, the detection voltage and detection current values ​​can be determined as needed. In one specific embodiment, the detection current increases with the thickness of the oxide layer to sufficiently induce the tunneling effect. In another specific embodiment, the detection voltage increases with the thickness of the oxide layer, or the detection voltage value can be adjusted according to the degree of oxidation or the thickness of the oxide layer (i.e., the thickness of the oxide layer 912 at the first end 910 of the battery under test 900) to ensure that a voltage value sufficient to induce the tunneling effect is provided. The reference formula is E=V / d, where E represents the electric field, V represents the potential difference, and d represents the distance along the direction of the electric field. For example, the greater the degree of battery oxidation, the thicker the oxide layer on the surface of the electrode of the battery under test, which means a larger distance (d) along the direction of the electric field. At this time, a larger voltage (V) will be required to form a larger electric field (E). The electric field will cause the charge on the surface of the probe 116 to rearrange and stack on the tip of the probe, helping electrons to escape from the tip of the probe, tunnel through the oxide layer (or insulating layer) and reach the electrode surface of the battery under test.

[0058] It is worth noting that when an electric field is applied in a specific direction, the potential energy of the material will change, which may directly affect the ionization energy of electrons (that is, the energy required for electrons to detach from the surface of the material), and may also indirectly change the potential energy difference between materials, thus increasing or decreasing the difficulty of electron conduction between materials. Figure 7 This is a schematic diagram illustrating the potential energy distribution between a probe and the battery under test in a battery internal resistance measurement system according to a specific embodiment of the present invention after applying an electric field in a specific direction. Please refer to... Figure 7 When the battery internal resistance measurement system applies an electric field in the opposite direction, the potential energy of the probe tip 16a is low, and the electron ionization energy is high. At this time, electrons 8 are not easily detached from the surface of the probe tip 16a. Furthermore, the potential energy difference between the probe tip 16a and the oxide layer 12 is relatively large. In summary, electrons 8 are neither easily detached from the surface of the probe tip 16a nor easily overcome the potential energy difference between the probe tip 16a and the oxide layer 12. Therefore, the electron tunneling effect is not easily generated, with a success rate of only about 11.1%. In contrast, according to... Figure 2aand 2b When an electric field is applied in a specific direction, the potential energy of the probe tip 216a increases under the action of the electric field, and the potential energy difference between it and the oxide layer 912 decreases. The electric field causes the electrons 800 of the probe tip 216a to rearrange and stack on the tip. Finally, the electrons detach from the surface of the probe tip 216a and can pass through the oxide layer 912 to reach the first end 910 of the battery under test. The electron tunneling effect is easy to generate, with a success rate of about 88.8%.

[0059] Please see Figure 6 The flowchart illustrating a specific embodiment of the battery internal resistance measurement method according to the present invention is shown below. Figure 6 In the illustrated embodiment, the battery internal resistance measurement method 600 is used to measure the internal resistance value of a battery under test. The battery under test includes a first end and a second end, and the first end of the battery under test has an oxide layer. The battery internal resistance measurement method 600 begins at step 610, by electrically connecting a first connection terminal and a second connection terminal of a power supply device to the first end and the second end of the battery under test, respectively (wherein one of the first connection terminal and the second connection terminal has a probe), and by making the probe of the power supply device contact (or electrically connect) the oxide layer of the battery under test.

[0060] Next, step 620 is executed, connecting the data acquisition device to the battery under test and the power supply device. Next, step 630 is executed, establishing a communication connection between the computing device and the power supply device and / or the data acquisition device. Next, step 640 is executed, where the power supply device supplies power to the battery under test via a probe, allowing electrons to pass through the oxide layer to reach the first end, thereby generating a tunneling current. The power supply device is electrically connected to the data acquisition device and the battery under test, forming a closed loop. Next, step 650 is executed, where the data acquisition device measures the tunneling current and the voltage of the battery under test. Next, step 660 is executed, where the computing device calculates the internal resistance of the battery under test based on the voltage and current values ​​measured by the data acquisition device.

[0061] In one specific embodiment, the battery internal resistance measurement method 600 may further include the following steps: connecting the power supply device and the battery under test in parallel. In one specific embodiment, the battery internal resistance measurement method 600 may further include the following steps: connecting the data acquisition device and the battery under test in series. In one specific embodiment, the battery internal resistance measurement method 600 may further include the following steps: forming a circuit with the power supply device, the data acquisition device, and the battery under test.

[0062] In one embodiment, the probe may have a blunt end and a sharp end. The battery internal resistance measurement method 600 may further include the step of supplying an electron flow from the blunt end to the sharp end of the probe via a power supply device. In one embodiment, a first end of the battery under test is the positive terminal, and a second end of the battery under test is the negative terminal. The battery internal resistance measurement method 600 further includes the step of supplying an electron flow from the positive terminal to the negative terminal of the battery under test via a power supply device.

[0063] In one embodiment, the battery internal resistance measurement method 600 may further include the following steps: providing a test current to the battery under test via a power supply device in a direction from the negative terminal to the positive terminal. In one embodiment, the probe may have a blunt end and a pointed end. The battery internal resistance measurement method 600 further includes the following steps: providing a test current to the battery under test via a power supply device in a direction from the pointed end to the blunt end of the probe. In one embodiment, the battery internal resistance measurement method 600 may further include the following steps: providing a voltage to the battery under test via the power supply device, such that the potential at the first end is lower than the potential at the second end.

[0064] In one specific embodiment, the battery internal resistance measurement method 600 may further include the following steps: applying a detection voltage to the battery under test through a probe using a power supply device, thereby causing the battery under test to undergo a tunneling effect and generate a tunneling current. In one specific embodiment, the first terminal of the battery under test is the positive terminal, and the second terminal of the battery under test is the negative terminal. The battery internal resistance measurement method 600 may further include the following steps: connecting the probe of the first connection terminal of the power supply device to the positive terminal, and connecting the second connection terminal of the power supply device to the negative terminal.

[0065] In one specific embodiment, the battery internal resistance measurement method 600 may further include the following steps: providing a detection current to the circuit via the power supply device; measuring the voltage across the circuit via the data acquisition device; and calculating the internal resistance value of the battery under test via the calculation device based on the detection current and voltage across the circuit measured by the data acquisition device. In another specific embodiment, the battery internal resistance measurement method 600 may further include the following steps: providing a detection voltage to the circuit via the power supply device; measuring the current in the circuit via the data acquisition device; and calculating the internal resistance value of the battery under test via the calculation device based on the detection voltage and current measured by the data acquisition device. In one specific embodiment, the detection voltage increases with the thickness of the oxide layer.

[0066] Thus, the battery internal resistance measurement system and method of the present invention have been described above with reference to the figures. It should be understood that, using the battery internal resistance measurement system and method of the present invention, the user can measure the internal resistance value of the target battery 900 through the field emission (FE) principle, also known as the carrier tunneling effect, without first removing the oxide layer on the first end of the battery under test. It should be understood that the above embodiments are not limited to individual implementations, but can be selectively combined and implemented as needed. Furthermore, the various specific embodiments of the present invention are merely illustrative, and various modifications can be made without departing from the scope and spirit of the present invention, and all such modifications should be included within the scope of the present invention. Therefore, the specific embodiments described in this specification are not intended to limit the present invention, and the true scope and spirit of the present invention are disclosed in the following patent claims.

[0067] [Symbol Explanation]

[0068] 5 electron flow

[0069] 8 Electronics

[0070] 10 First end

[0071] 12 Oxide Layer

[0072] 16a probe tip

[0073] 100 Battery Internal Resistance Measurement System

[0074] 110 power supply unit

[0075] 112 First connecting terminal

[0076] 114 Second Connection Terminal

[0077] 116 probe

[0078] 116a tip

[0079] 116b blunt end

[0080] 120 data acquisition device

[0081] 130 computing device

[0082] 216a tip

[0083] 250 electron flow direction

[0084] 260 Current Direction

[0085] 340 probe

[0086] 340a tip

[0087] 340b blunt end

[0088] 342 Central Department

[0089] 344 edge

[0090] Method for measuring the internal resistance of a 600 battery

[0091] Steps 610-660

[0092] 800 Electronics

[0093] 900 batteries under test

[0094] 910 First end

[0095] 912 oxide layer

[0096] 920 Second End

Claims

1. A battery internal resistance measurement system for measuring an internal resistance value of a battery under test, the battery under test comprising a first end and a second end, wherein the first end has an oxide layer; the battery internal resistance measurement system comprising: A power supply device includes a first connection terminal and a second connection terminal, the first connection terminal and the second connection terminal being used for electrical connection to a first end and a second end of a battery under test, respectively, wherein one of the first connection terminal and the second connection terminal has a probe; wherein, The probe is used to contact the oxide layer of the battery under test and to supply power to the battery under test through the probe, so that electrons can pass through the oxide layer to reach the first end, thereby generating a tunneling current. A data acquisition device is electrically connected to the battery under test and the power supply device to form a circuit; wherein, after the tunneling current is generated, the data acquisition device measures a current value of the tunneling current and a voltage value of the battery under test; and A computing device, communicatively connected to the power supply device and / or the data acquisition device, calculates the internal resistance value of the battery under test based on the voltage value and the current value.

2. The battery internal resistance measurement system of claim 1, wherein the probe has a blunt end and a sharp end, and the power supply device provides an electron flow along the direction from the blunt end of the probe to the sharp end.

3. The battery internal resistance measurement system of claim 1, wherein the first end is a positive terminal, the second end is a negative terminal, and the power supply device provides an electron flow along the direction from the positive terminal to the negative terminal of the battery under test.

4. The battery internal resistance measurement system of claim 3, wherein the power supply device provides a test current to the battery under test, the direction of the test current being from the negative terminal to the positive terminal of the battery under test.

5. The battery internal resistance measurement system of claim 1, wherein the probe has a blunt end and a sharp end; wherein the power supply device provides a test current to the battery under test, the direction of the test current being from the sharp end of the probe to the blunt end.

6. The battery internal resistance measurement system of claim 1, wherein the power supply device provides a voltage to the battery under test such that the potential of the first end is lower than the potential of the second end.

7. The battery internal resistance measurement system of claim 1, wherein the power supply device applies a detection voltage to the battery under test via the probe to induce a tunneling effect in the battery under test and generate the tunneling current.

8. The battery internal resistance measurement system as claimed in claim 1, wherein the first end of the battery under test is a positive terminal, the second end of the battery under test is a negative terminal, the probe of the first connection terminal of the power supply device is connected to the positive terminal, and the second connection terminal of the power supply device is connected to the negative terminal.

9. The battery internal resistance measurement system of claim 1, wherein the power supply device provides a detection current in the circuit, and the data acquisition device measures the trans-voltage of the battery under test; The computing device calculates the internal resistance value of the battery under test based on the detected current and the voltage across the battery.

10. The battery internal resistance measurement system of claim 9, wherein the detection current increases with the thickness of the oxide layer.

11. The battery internal resistance measurement system of claim 1, wherein the power supply device provides a detection voltage in the circuit, and the data acquisition device measures a current in the circuit; The computing device calculates the internal resistance value of the battery under test based on the detected voltage and the current.

12. The battery internal resistance measurement system of claim 11, wherein the detection voltage increases with the increase of the thickness of the oxide layer.

13. A method for measuring the internal resistance of a battery, used to measure an internal resistance value of a battery under test, the battery under test comprising a first end and a second end, wherein the first end has an oxide layer; the method for measuring the internal resistance of a battery comprises the following steps: A first connection terminal and a second connection terminal of a power supply device are respectively connected to the first end and the second end of the battery under test, wherein one of the first connection terminal and the second connection terminal has a probe, and the probe of the power supply device contacts the oxide layer of the battery under test. Connect a data acquisition device to the battery under test and the power supply device; Enables a computing device to communicate with the power supply device and / or the data acquisition device; The power supply device supplies power to the battery under test through the probe, allowing electrons to pass through the oxide layer and reach the first end, thereby generating a tunneling current. The power supply device is electrically connected to the data acquisition device and the battery under test to form a circuit. The data acquisition device measures a current value of the tunneling current and a voltage value of one of the batteries under test; as well as The computing device calculates the internal resistance value of the battery under test based on the voltage value and the current value.

14. The battery internal resistance measurement method of claim 13, wherein the probe has a blunt end and a sharp end, and the battery internal resistance measurement method further comprises the following steps: The power supply device provides an electron flow along the direction from the blunt end of the probe to the tip.

15. The battery internal resistance measurement method of claim 13, wherein the first end is a positive terminal and the second end is a negative terminal, the battery internal resistance measurement method further comprising the following steps: The power supply device provides an electron flow from the positive terminal to the negative terminal of the battery under test.

16. The battery internal resistance measurement method of claim 15 further comprises the following step: providing a test current to the battery under test in a direction from the negative terminal to the positive terminal of the battery under test by the power supply device.

17. The battery internal resistance measurement method of claim 13, wherein the probe has a blunt end and a pointed end; The battery internal resistance measurement method further includes the following steps: the power supply device provides a test current to the battery under test along the direction from the tip of the probe to the blunt end.

18. The battery internal resistance measurement method of claim 13 further comprises the following steps: providing a voltage to the battery under test by the power supply device, such that the potential of the first end is lower than the potential of the second end.

19. The battery internal resistance measurement method of claim 13 further comprises the following steps: applying a detection voltage to the battery under test through the probe by the power supply device, so that the battery under test undergoes a tunneling effect and generates the tunneling current.

20. The battery internal resistance measurement method of claim 13, wherein the first end of the battery under test is a positive terminal, the second end of the battery under test is a negative terminal, and the battery internal resistance measurement method further comprises the following steps: This causes the probe of the first connection terminal of the power supply device to connect to the positive terminal, and causes the second connection terminal of the power supply device to connect to the negative terminal.

21. The battery internal resistance measurement method of claim 13, further comprising the following steps: The power supply device provides a detection current to the circuit; The data acquisition device measures the cross voltage across the circuit; and The computing device calculates the internal resistance value of the battery under test based on the detected current and the voltage across the battery.

22. The battery internal resistance measurement method of claim 13, further comprising the following steps: The power supply device provides a detection voltage to the circuit; The data acquisition device measures one of the currents in the circuit; and The computing device calculates the internal resistance value of the battery under test based on the detected voltage and the current.

23. The battery internal resistance measurement method of claim 22 further includes the following step: the detection voltage increases with the increase of the thickness of the oxide layer.

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