A method and system for quickly testing the internal resistance of a zinc battery

Abstract

The present application provides a method and system for quickly testing the internal resistance of a zinc battery, which is applied to the field of energy storage technology. The method is used to test the internal resistance of a zinc battery. The method includes: obtaining the current number of charging times of the zinc battery, and determining the test current value according to the current number of charging times and a data mapping table. The data mapping table records the test current values ​​corresponding to different charging number intervals. Based on the determined test current value, a test current is provided to the first pole of the zinc battery. A sampled electrical signal of the second pole of the zinc battery is collected, and the internal resistance of the zinc battery is calculated according to the sampled electrical signal. The embodiment of the present application realizes rapid and accurate detection of the internal resistance of the zinc battery.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a method and system for quickly testing the internal resistance of a zinc battery. Background Art

[0002] With the development of technology, social science and technology applications are changing with each passing day. With the continuous iteration and update of technology, the demand for energy is also gradually increasing. Many devices need to store energy. The technical improvement and technical support of energy storage equipment are related to the application of many energy devices, such as new energy vehicles and portable smart devices. A common energy storage device is a battery (or battery system). Batteries can be made of different materials. Batteries of different materials achieve energy storage or power supply based on different chemical reactions. Zinc-based batteries refer to batteries made of metallic zinc. Common zinc-based batteries include zinc-air batteries, zinc flow batteries, and zinc-ion batteries.

[0003] Taking zinc-air battery as an example, it has the following advantages over lithium battery: Advantage 1: High energy density, which is twice the capacity density of lithium-ion battery under the same conditions. Therefore, zinc battery is a very ideal material. Advantage 2: Simple manufacturing process and low cost. Advantage 3: Safe and reliable, which is very advantageous in power battery. It is hoped that the battery will not fail in the case of short circuit, puncture and impact. Advantage 4: Environmental protection. In the case of environmental protection advocated by the whole world, the material of the battery itself also needs to be pollution-free and free of toxic substances. The positive electrode of zinc battery uses activated carbon and copper mesh, and the negative electrode uses metallic zinc, without using some toxic substances. However, zinc battery needs to be tested for battery safety and service life. Therefore, in order to ensure the safety of zinc battery and test its service life. During the use stage of zinc battery, various parameters of the battery need to be tested, including the internal resistance of zinc battery. How to quickly and accurately test the internal resistance of zinc battery is a big problem. Summary of the invention

[0004] The embodiments of the present application provide a method and system for quickly testing the internal resistance of a zinc battery, which enables rapid and accurate detection of the internal resistance of the zinc battery.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In the first aspect, the embodiments of the present application provide a method for quickly testing the internal resistance of a zinc battery, which is used to test the internal resistance of a zinc battery. The method includes: obtaining the current number of charging times of the zinc battery, and determining the test current value according to the current number of charging times and a data mapping table; the data mapping table records the test current values ​​corresponding to different charging number intervals. Based on the determined test current value, a test current is provided to the first pole of the zinc battery. A sampled electrical signal of the second pole of the zinc battery is collected, and the internal resistance of the zinc battery is calculated according to the sampled electrical signal.

[0007] In a possible implementation, the method of providing a test current to the first pole of the zinc battery based on the determined test current value comprises: generating at least one conduction control signal to control the current generating circuit to provide the test current to the first pole of the zinc battery based on the size of the determined test current value. The current generating circuit comprises a plurality of mirror branches and an output branch. Each mirror branch comprises a first transistor, a current source, a first control switch, and a second control switch. In each mirror branch, the second pole of the first transistor is connected to the input end of the current source, and the output end of the current source is grounded. The first control switch is connected between the first pole of the first transistor and the gate of the first transistor. The second control switch is connected between the second pole of the first transistor and the gate of the first transistor. The output branch comprises a second transistor. The gate of the second transistor is connected to the gate of the first transistor in all mirror branches to form a current mirror structure. Each of the at least one conduction control signal is used to control a corresponding first control switch to be turned on and a corresponding second control switch to be turned off, or to control a corresponding first control switch to be turned off and a corresponding second control switch to be turned on. The second pole of the second transistor serves as the output end of the current generating circuit to provide the test current.

[0008] In a possible implementation, before obtaining the current charging times of the zinc battery, the method further includes: obtaining a plurality of recycled zinc batteries, the plurality of recycled zinc batteries having different charging times. Providing a test current to the first poles of the plurality of recycled zinc batteries respectively, and sampling and obtaining recycling sampling electrical signals of the second poles of the plurality of recycled zinc batteries. Determining a data mapping table according to the charging times corresponding to the plurality of recycled zinc batteries and the values ​​of the recycling sampling electrical signals.

[0009] In a possible implementation manner, the sampled electrical signal includes a sampled voltage and a sampled current.

[0010] In a second aspect, an embodiment of the present application also provides a rapid internal resistance test system for a zinc battery, the system comprising a current generating circuit, a sampling circuit and a control circuit. The control circuit is connected to the current generating circuit and the sampling circuit respectively. The current generating circuit is used to connect to the first pole of the zinc battery. The sampling circuit is used to connect to the second pole of the zinc battery. Among them, the control circuit is used to: obtain the current charging number of the zinc battery, and determine the test current value according to the current charging number and the data mapping table. The data mapping table records the test current values ​​corresponding to different charging number intervals. Based on the determined test current value, the current generating circuit is controlled to provide a test current to the first pole of the zinc battery. The sampling circuit is controlled to collect the sampled electrical signal of the second pole of the zinc battery, and the internal resistance of the zinc battery is calculated according to the sampled electrical signal.

[0011] In a possible implementation, the current generating circuit includes a plurality of mirror branches and an output branch. Each mirror branch includes a first transistor, a current source, a first control switch, and a second control switch. In each mirror branch, the second pole of the first transistor is connected to the input end of the current source, and the output end of the current source is grounded. The first control switch is connected between the first pole of the first transistor and the gate of the first transistor. The second control switch is connected between the second pole of the first transistor and the gate of the first transistor. The output branch includes a second transistor. The gate of the second transistor is connected to the gate of the first transistor in all mirror branches to form a current mirror structure. The second pole of the second transistor serves as the output end of the current generating circuit to provide a test current. The control circuit is specifically used to: based on the size of the determined test current value, output at least one conduction control signal to the current generating circuit, each of the at least one conduction control signal is used to control a corresponding first control switch to be turned on and a corresponding second control switch to be turned off, or to control a corresponding first control switch to be turned off and a corresponding second control switch to be turned on, so as to control the current generating circuit to provide a test current to the first pole of the zinc battery.

[0012] In a possible implementation, the output branch further includes a conduction transistor, a first electrode of the conduction transistor is connected to a second electrode of the second transistor, and the second electrode of the conduction transistor serves as an output end of the current generating circuit to provide a test current.

[0013] In a possible implementation, the data mapping table is determined by the number of charging times corresponding to the plurality of recycled zinc batteries and the value of the recycled sampled electrical signal. The plurality of recycled zinc batteries have different number of charging times. Each recycled sampled electrical signal is an electrical signal of the second pole of the corresponding recycled zinc battery when the test current is input to the first pole of the corresponding recycled zinc battery.

[0014] In one possible implementation, the control circuit includes a battery management module and a controller. The battery management module is connected to the zinc battery. The controller is respectively connected to the battery management module, the current generating circuit and the sampling circuit. The battery management module is used to record the number of times the zinc battery is charged. The controller is used to: obtain the current number of times the zinc battery is charged, and determine the test current value according to the current number of times and the data mapping table. Based on the determined test current value, the current generating circuit is controlled to provide a test current to the first pole of the zinc battery. The sampling circuit is controlled to collect the sampled electrical signal of the second pole of the zinc battery, and the internal resistance of the zinc battery is calculated according to the sampled electrical signal.

[0015] In a possible implementation manner, the sampled electrical signal includes a sampled voltage and a sampled current.

[0016] The embodiments of the present application have the following advantages:

[0017] Advantage 1. With the different number of times the zinc battery is charged (i.e., the different degree of charge and discharge use of the zinc battery), the degree of aging of the zinc battery device is different. Under different degrees of device aging, various parameters of the zinc battery will change, and these parameters include not only the internal resistance parameters. Usually, the degree of change of these parameters is not linear with the degree of device aging. Therefore, in practical applications, it is difficult to accurately calculate the transformation details between each fine parameter and the degree of device aging, and it is impossible to take the changes of other parameters into account when calculating the internal resistance. As a result, there is an error in the calculation result of the internal resistance. In order to eliminate this error, a data mapping table is designed in the embodiment of the present application. Different test currents are designed for zinc batteries with different charging times (i.e., zinc batteries in different use stages). By distinguishing the test currents, different test currents are adapted to the tests under different charging times intervals, so as to obtain better test results. In addition, the detection can be quickly achieved by querying the data mapping table.

[0018] Advantage 2: An improved current mirror structure is formed by using multiple first transistors and one second transistor, and a current generating circuit that can generate different values ​​and output current values ​​that are stable and accurate is designed to generate an accurate and stable test current. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the system structure of a zinc battery internal resistance rapid test system provided in the embodiment of the present application Figure 1 ;

[0020] Figure 2 A schematic diagram of the system structure of a zinc battery internal resistance rapid test system provided in the embodiment of the present application Figure 2 ;

[0021] Figure 3A schematic diagram of a current generating circuit provided in an embodiment of the present application Figure 1 ;

[0022] Figure 4 It is a structural schematic diagram of a traditional current mirror structure;

[0023] Figure 5 A schematic diagram of a current generating circuit provided in an embodiment of the present application Figure 2 ;

[0024] Figure 6 A schematic diagram of a flow chart of a method for quickly testing the internal resistance of a zinc battery provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] It should be noted that the terms "first", "second", etc. involved in the embodiments of the present application are only used to distinguish features of the same type and cannot be understood as indicating relative importance, quantity, order, etc.

[0026] The terms "exemplary" or "for example" and the like in the embodiments of the present application are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the related concepts in a specific way.

[0027] The term "connection" involved in the embodiments of the present application should be understood in a broad sense. For example, it may refer to a physical direct connection, or it may refer to an indirect connection achieved through electronic devices, such as a connection achieved through resistors, inductors, capacitors or other electronic devices.

[0028] First, some basic concepts involved in the embodiments of the present application are explained:

[0029] With the development of technology, social science and technology applications are changing with each passing day. With the continuous iteration and update of technology, the demand for energy is also gradually increasing. Many devices need to store energy. The technical improvement and technical support of energy storage equipment are related to the application of many energy devices, such as new energy vehicles and portable smart devices. A common energy storage device is a battery (or battery system). Batteries can be made of different materials. Batteries of different materials achieve energy storage or power supply based on different chemical reactions. Zinc-based batteries refer to batteries made of metallic zinc. Common zinc-based batteries include zinc-air batteries, zinc flow batteries, and zinc-ion batteries.

[0030] Taking zinc-air battery as an example, it has the following advantages over lithium battery: Advantage 1: High energy density, which is twice the energy density of lithium-ion battery under the same conditions. Therefore, zinc battery is a very ideal material. Advantage 2: Simple manufacturing process and low cost. Advantage 3: Safe and reliable, which is very advantageous in power battery. It is hoped that the battery will not fail in the case of short circuit, puncture and impact. Advantage 4: Environmental protection. In the case of environmental protection advocated by the whole world, the material of the battery itself also needs to be pollution-free and free of toxic substances. The positive electrode of zinc battery uses activated carbon and copper mesh, and the negative electrode uses metal zinc, without using some toxic substances. However, zinc battery needs to be tested for battery safety and service life. Therefore, in order to ensure the safety of zinc battery and test its service life. During the use stage of zinc battery, various parameters of the battery need to be tested, including the internal resistance of zinc battery. How to quickly and accurately test the internal resistance of zinc battery is a big problem.

[0031] The internal resistance of a battery refers to the resistance to the flow of current through the battery when the battery is working. It includes ohmic internal resistance and polarization internal resistance. Polarization internal resistance includes electrochemical polarization internal resistance and concentration polarization internal resistance. Zinc batteries, also known as zinc-air batteries or wet zinc batteries, are secondary batteries that are widely used in portable electronic devices and wearable technologies. Its internal resistance is mainly determined by several factors: First, electrode material resistance: The purity, particle size and contact area of ​​electrode materials (such as zinc metal and air oxide) affect its internal resistance. Second, electrolyte resistance: The resistance to ion flow in the electrolyte solution, including the solubility and conductivity of water and electrolyte salts. Third, ion diffusion: During the charge and discharge process, the speed at which ions move in the electrolyte affects the current transmission, and a slower diffusion rate will increase the internal resistance. Fourth, electrode surface activity: If there is unevenness or sediment on the electrode surface, this may lead to increased resistance. Fifth, contact resistance: The contact resistance of the connecting parts between battery components (such as joints, diaphragms) will also contribute to part of the internal resistance. The internal resistance of a zinc battery will change with the charge and discharge state, usage time and environmental conditions. Well-designed zinc batteries typically reduce internal resistance by optimizing materials and structures to provide higher energy density and longer service life.

[0032] In the production stage of batteries, internal resistance testing is usually an important part of early quality control. Battery internal resistance is an important indicator to measure the performance and efficiency of internal materials in batteries. It affects the battery's charge and discharge efficiency, cycle life, and temperature rise. Manufacturers conduct rigorous internal resistance tests on batteries during the manufacturing process to ensure that each battery meets specifications and reduce possible quality problems. However, during the use stage of the battery, especially for some applications that require precise monitoring of battery health, such as electric vehicles or wearable devices, internal resistance testing is also performed regularly to detect aging, performance degradation, or potential failures in a timely manner. Users or maintenance personnel may use dedicated instruments for long-term monitoring to evaluate the actual performance of the battery and make replacement decisions. For zinc-based batteries, the detection of their performance and service life is very important. Therefore, how to detect some important parameters of zinc-based batteries is a major design requirement, such as detecting internal resistance. Common zinc-based batteries include but are not limited to zinc-air batteries, zinc flow batteries, and zinc-ion batteries. Take zinc-air batteries (also known as zinc-oxygen batteries) as an example. They are a common type of rechargeable battery that generates electricity through the reaction of zinc and oxygen. Zinc flow battery is an energy storage system that uses metallic zinc materials, has low cost characteristics, and can be charged and discharged in large capacity and for a long time. Zinc-ion battery (ZIB) is a new type of secondary battery. It is based on metallic zinc as the negative electrode material, usually using zinc-rich compounds (such as zinc oxide or zinc sulfide) as the positive electrode material, and the electrolyte uses a solution or solid electrolyte that can conduct zinc ions. Zinc-ion batteries have a variety of positive electrode material options, and the energy density and cycle performance of the battery can be optimized as needed. Zinc-ion batteries also have a high power density and are suitable for some application scenarios that require fast charging and discharging. Internal resistance testing is crucial for evaluating battery performance, efficiency, and health. In zinc batteries, internal resistance testing usually involves the following steps:

[0033] First, measurement equipment preparation: Use a high-precision electronic measuring instrument, such as a digital multimeter or battery tester, which has a built-in function for measuring internal resistance.

[0034] Second, disconnect the battery: Make sure the battery is completely disconnected from the load and power source when testing to avoid external factors interfering with the test results.

[0035] Next, set up the DC voltage drop: This is a common method that applies a known constant voltage across the battery and measures the current flowing through the battery. The internal resistance can be calculated using the formula R = (V - Eo) / I, where R is the internal resistance, V is the voltage, I is the current, and Eo is the open circuit voltage (the voltage when there is no load).

[0036] Then, in order to improve the test accuracy, optionally, a periodic test can be performed: in order to obtain an accurate average value, it may be necessary to test the battery multiple times under different charge and discharge conditions, record the data and take the average value.

[0037] Finally, perform data analysis: By comparing the internal resistance values ​​at different time points or battery states, it is possible to analyze whether the battery performance decreases over time, whether there is any aging phenomenon, etc.

[0038] The present application embodiment provides a zinc battery internal resistance rapid testing system, such as Figure 1 As shown, the system 1000 includes a current generating circuit 100, a sampling circuit 200 and a control circuit 300. The control circuit 300 is connected to the current generating circuit 100 and the sampling circuit 200 respectively. The current generating circuit 100 is used to connect to the first pole of the zinc battery X. The sampling circuit 200 is used to connect to the second pole of the zinc battery X. Among them, the control circuit 300 is used to: obtain the current charging number of the zinc battery X, and determine the test current value according to the current charging number and the data mapping table; the data mapping table records the test current values ​​corresponding to different charging number intervals. Based on the determined test current value, the current generating circuit 100 is controlled to provide a test current to the first pole of the zinc battery X. The sampling circuit 200 is controlled to collect the sampling electrical signal of the second pole of the zinc battery X, and the internal resistance of the zinc battery X is calculated according to the sampling electrical signal.

[0039] In the embodiment of the present application, with the different number of times the zinc battery is charged (i.e., the different degree of charge and discharge use of the zinc battery), it represents the different degree of device aging of the zinc battery. Under different device aging degrees, various parameters of the zinc battery will change, and these parameters include not only the internal resistance parameters. Generally, the degree of change of these parameters is not linear with the degree of device aging. Therefore, in practical applications, it is difficult to accurately calculate the transformation details between each fine parameter and the degree of device aging, and it is impossible to take the changes of other parameters into account when calculating the internal resistance. As a result, there is an error in the calculation result of the internal resistance. In order to eliminate this error, a data mapping table is designed in the embodiment of the present application. Different test currents are designed for zinc batteries with different charging times (i.e., zinc batteries in different use stages). By distinguishing the test currents, different test currents are adapted to the tests under different charging times intervals, so as to obtain better test results.

[0040] In some possible implementations, such as Figure 2As shown, the control circuit 300 includes a battery management module 310 and a controller 320. The battery management module 310 is connected to the zinc battery X. The controller 320 is respectively connected to the battery management module 310, the current generating circuit 100 and the sampling circuit 200. The battery management module 310 is used to record the number of times the zinc battery X is charged. The controller 320 is used to: obtain the current number of times the zinc battery X is charged, determine the test current value according to the current number of times and the data mapping table; control the current generating circuit 100 to provide a test current to the first pole of the zinc battery X based on the determined test current value; control the sampling circuit 200 to collect the sampled electrical signal of the second pole of the zinc battery X, and calculate the internal resistance of the zinc battery X according to the sampled electrical signal. In the embodiment of the present application, modern batteries are usually equipped with a battery management system (BMS). The BMS can monitor the voltage, current, temperature and charge and discharge status of the battery. The BMS will stop charging when the battery is charged to a certain degree (usually 80%-90% of the full capacity), and then start discharging when the battery voltage drops to a certain degree, so as to record the charging and discharging cycles. The charge and discharge cycle count can also be performed. For example, the BMS will track each complete charge and discharge process, that is, from full discharge to full charge and then to discharge again, which is called a charge and discharge cycle. This value is an important indicator for evaluating the health of the battery. The number of charging times is recorded by the battery management module 310 (i.e., the battery management system). The controller 320 obtains the recorded number of charging times from the battery management module 310, determines the test current value according to the current number of charging times and the data mapping table; controls the current generation circuit 100 to provide a test current to the first pole of the zinc battery X based on the determined test current value; and controls the sampling circuit 200 to collect the sampled electrical signal of the second pole of the zinc battery X, and calculates the internal resistance of the zinc battery X according to the sampled electrical signal. The above method can quickly complete the accurate measurement of the internal resistance.

[0041] In some possible implementations, such as Figure 3As shown, the current generating circuit 100 includes a plurality of mirror branches 110 and an output branch 120. Each mirror branch 110 includes a first transistor 111, a current source 112, a first control switch 113 and a second control switch 114. In each mirror branch 110, the second electrode of the first transistor 111 is connected to the input end of the current source 112, and the output end of the current source 112 is grounded. The first control switch 113 is connected between the first electrode of the first transistor 111 and the gate of the first transistor 111. The second control switch 114 is connected between the second electrode of the first transistor 111 and the gate of the first transistor 111. The output branch 120 includes a second transistor 121. The gate of the second transistor 121 is connected to the gate of the first transistor 111 in all the mirror branches 110 to form a current mirror (current mirror, CM) structure. The second electrode of the second transistor 121 serves as the output end of the current generating circuit 100 to provide a test current. The control circuit 300 is specifically used to: output at least one conduction control signal to the current generating circuit 100 based on the determined test current value, each of the at least one conduction control signal is used to control a corresponding first control switch 113 to be turned on and a corresponding second control switch 114 to be turned off, or to control a corresponding first control switch 113 to be turned off and a corresponding second control switch 114 to be turned on, so as to control the current generating circuit 100 to provide a test current to the first pole of the zinc battery X.

[0042] In this application Figure 3 In the embodiment shown, in order to ensure the accuracy of the voltage and current values ​​provided at different stages, a current mirror structure can be used to achieve accurate adjustment of the current and voltage values. The specific principle is as follows: Figure 4 As shown in the figure, it is a schematic diagram of the structure of a traditional current mirror structure. In the traditional current mirror structure, the gates of two transistors are connected together so that the voltage between the gates of the two transistors is equal. The conduction characteristics of the transistor are as follows: according to the different sizes of the threshold voltage Vth received by the gate, the degree of conduction of the channel of the transistor is also different (that is, the voltage flowing from the first pole to the second pole of the transistor is also different), so that there is a proportional relationship between the currents flowing between the two transistors, and the proportional relationship is determined by the ratio of the width and length of the channel between the two transistors. Because the communication width and length of the transistor are fixed, when the current flowing through the transistor connected to the gate and the second pole is controlled, the current flowing through the other transistor of the mirror can be controlled. By improving the current mirror structure, the following can be obtained: Figure 3 The structure shown. Figure 3In the structure shown, multiple mirror branches 110 can be set, and each mirror branch 110 is provided with a current source 112. The current source 112 is a device that can provide a constant current size. The current flowing through each mirror branch 110 is constant through the current source 112. The gate of the first transistor 111 in each mirror branch 110 is connected to the gate of the second transistor 121 of the output branch 120. For a certain mirror branch 110, by controlling the on and off of the corresponding first control switch 113 and the second control switch 114, the first transistor 111 in the corresponding mirror branch 110 can be turned off or on. When the first transistor 111 is turned on, it forms a current mirror structure with the second transistor 121. When the first transistor 111 is turned off, it does not form a current mirror structure with the second transistor 121 and can be regarded as not connected to the second transistor 121 in the equivalent circuit. All the first transistors 111 that are turned on can form a current mirror structure with the second transistor 121, so that the current output by the second pole of the second transistor 121 is proportional to the sum of the currents of all the first transistors 111 that are turned on. Therefore, by adjusting the number of the first control switches 113 and the second control switches 114 that are turned on or off, the numerical control of the current and voltage output by the second transistor 121 can be achieved. The current and voltage output by the second transistor 121 can be set to be proportional to the first transistor 111. Because the current of the first transistor 111 is provided by the current source 112 of the constant current source, the current value and voltage value of the test current output by the second transistor 121 are controllable and accurate values. Based on the electrical signal output by the second transistor 121 as the test current, the accuracy and stability of the test can be improved.

[0043] Exemplarily, when the first control switch 113 is turned on and the second control switch 114 is turned off, the first transistor 111 is turned off. When the first control switch 113 is turned off and the second control switch 114 is turned on, the first transistor 111 is turned on. In the embodiment of the present application, the first electrode of the first transistor 111 is the source electrode, and the second electrode of the first transistor 111 is the drain electrode. By controlling the on and off of the first control switch 113 and the second control switch 114, the gate-source voltage VGS of the first transistor 111 can be controlled, and the on and off control of the first transistor 111 can be achieved by controlling the gate-source voltage VGS.

[0044] For example, the controller 320 may provide at least one conduction control signal to at least one second control switch 114. Each of the at least one conduction control signal is used to control the conduction and disconnection of a corresponding first control switch 113 and second control switch 114.

[0045] In some examples, such as Figure 5 As shown, the output branch 120 further includes a conduction transistor 122, a first electrode of the conduction transistor 122 is connected to a second electrode of the second transistor 121, and the second electrode of the conduction transistor 122 serves as an output end of the current generating circuit 100 to provide a test current. In the embodiment of the present application, the conduction or shutoff of the conduction transistor 122 can be controlled to control whether the output branch 120 outputs the test current.

[0046] Exemplarily, the sampled electrical signal includes a sampled voltage and a sampled current.

[0047] Based on the above Figure 1 , Figure 2 , Figure 3 and Figure 5 The system 1000 of the structure shown can implement a method for quickly testing the internal resistance of a zinc battery X, including the operations of steps S100 to S300 shown below.

[0048] S100, obtaining the current charging times of the zinc battery X, and determining the test current value according to the current charging times and the data mapping table.

[0049] In the embodiment of the present application, the data mapping table records the test current values ​​corresponding to different charging times. By obtaining the current charging times of the zinc battery X, the test current value is determined according to the current charging times and the data mapping table.

[0050] Exemplarily, before step S100, the method further includes designing a data mapping table, and the specific design steps include: obtaining a plurality of recycled zinc batteries, wherein the plurality of recycled zinc batteries have different charging times. Providing a test current to the first poles of the plurality of recycled zinc batteries respectively, and sampling and obtaining the recycling sampling electrical signals of the second poles of the plurality of recycled zinc batteries. Determining a data mapping table according to the charging times corresponding to the plurality of recycled zinc batteries and the values ​​of the recycling sampling electrical signals. In an embodiment of the present application, a plurality of zinc batteries are recycled in advance to obtain a plurality of recycled zinc batteries. A mapping data table is obtained by testing and summarizing the experience of the plurality of recycled zinc batteries.

[0051] Exemplarily, the mapping data table may be stored in a memory, which may be an independent storage device or an auxiliary storage structure (such as a register or a buffer) in a control circuit.

[0052] S200 , providing a test current to the first electrode of the zinc battery X based on the determined test current value.

[0053] Exemplarily, step S200 includes the following sub-operations: based on the determined test current value, generating at least one conduction control signal to control the current generating circuit 100 to provide the test current to the first pole of the zinc battery X. In the embodiment of the present application, each of the at least one conduction control signal is used to control the conduction and disconnection of a corresponding first control switch 113 and a second control switch 114.

[0054] Exemplarily, each of the at least one conduction control signal is used to control a corresponding first control switch 113 to be turned on and a corresponding second control switch 114 to be turned off, or to control a corresponding first control switch 113 to be turned off and a corresponding second control switch 114 to be turned on.

[0055] S300, collecting a sampled electrical signal of the second electrode of the zinc battery X, and calculating the internal resistance of the zinc battery X according to the sampled electrical signal.

[0056] Exemplarily, the sampled electrical signal includes a sampled voltage and a sampled current.

[0057] The controller involved in the embodiments of the present application may be a chip. For example, it may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), a central processor unit (CPU), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD), or other integrated chips.

[0058] The memory involved in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example but not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0059] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0060] Those of ordinary skill in the art will appreciate that the modules and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0061] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and modules described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0062] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the modules is only a logical function division. There may be other division methods in actual implementation, such as multiple modules or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or modules, which can be electrical, mechanical or other forms.

[0063] The modules described as separate components may or may not be physically separated, and the components shown as modules may or may not be physical modules, that is, they may be located in one device or distributed on multiple devices. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment.

[0064] In addition, each functional module in each embodiment of the present application may be integrated into one device, or each module may exist physically separately, or two or more modules may be integrated into one device.

[0065] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using a software program, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or may include one or more servers, data centers and other data storage devices that can be integrated with the medium. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a solid state disk (SSD)).

[0066] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for quickly testing the internal resistance of a zinc battery, characterized in that: The method is used to test the internal resistance of a zinc battery; the method comprises: Obtaining a plurality of recycled zinc batteries, wherein the plurality of recycled zinc batteries have different charging times; Providing test currents to the first electrodes of the plurality of recycled zinc batteries respectively, and sampling and obtaining recycling sampling electrical signals of the second electrodes of the plurality of recycled zinc batteries; Determine a data mapping table according to the number of charging times corresponding to the plurality of recycled zinc batteries and the value of the recycled sampled electrical signal; Obtaining the current charging times of the zinc battery, and determining the test current value according to the current charging times and a data mapping table; the data mapping table records the test current values ​​corresponding to different charging times intervals; providing a test current to the first electrode of the zinc battery based on the determined test current value; After providing the test current, a sampling electrical signal of the second pole of the zinc battery is collected, and the internal resistance of the zinc battery is calculated based on the sampling electrical signal.

2. The internal resistance rapid testing method according to claim 1, characterized in that: The step of providing a test current to the first electrode of the zinc battery based on the determined test current value comprises: Based on the determined value of the test current, at least one conduction control signal is generated to control a current generating circuit to provide the test current to the first pole of the zinc battery; the current generating circuit includes a plurality of mirror branches and an output branch; Each of the mirror branches comprises a first transistor, a current source, a first control switch and a second control switch; in each of the mirror branches, the second electrode of the first transistor is connected to the input end of the current source, and the output end of the current source is grounded; the first control switch is connected between the first electrode of the first transistor and the gate of the first transistor; the second control switch is connected between the second electrode of the first transistor and the gate of the first transistor; The output branch includes a second transistor; the gate of the second transistor is connected to the gates of the first transistors in all the mirror branches to form a current mirror structure; each of the at least one conduction control signal is used to control a corresponding first control switch to be turned on and a corresponding second control switch to be turned off, or to control a corresponding first control switch to be turned off and a corresponding second control switch to be turned on; the second electrode of the second transistor serves as the output end of the current generating circuit to provide the test current.

3. The internal resistance rapid testing method according to claim 1 or 2, characterized in that: The sampled electrical signal includes a sampled voltage and a sampled current.

4. A rapid internal resistance test system for a zinc battery, characterized in that: The system comprises a current generating circuit, a sampling circuit and a control circuit; the control circuit is connected to the current generating circuit and the sampling circuit respectively; the current generating circuit is used to be connected to the first pole of the zinc battery; the sampling circuit is used to be connected to the second pole of the zinc battery; wherein the control circuit is used to: The current charging times of the zinc battery are obtained, and the test current value is determined according to the current charging times and a data mapping table; the data mapping table records the test current values ​​corresponding to different charging times intervals; the data mapping table is determined by the charging times corresponding to a plurality of recycled zinc batteries and the values ​​of recycled sampling electrical signals; the plurality of recycled zinc batteries have different charging times; each recycled sampling electrical signal is an electrical signal of the second pole of the corresponding recycled zinc battery when the test current is input to the first pole of the corresponding recycled zinc battery; Controlling the current generating circuit to provide a test current to the first electrode of the zinc battery based on the determined test current value; After providing the test current, the sampling circuit is controlled to collect a sampling electrical signal of the second electrode of the zinc battery, and the internal resistance of the zinc battery is calculated according to the sampling electrical signal.

5. The internal resistance rapid testing system of zinc battery according to claim 4, characterized in that: The current generating circuit comprises a plurality of mirror branches and an output branch; each of the mirror branches comprises a first transistor, a current source, a first control switch and a second control switch; in each of the mirror branches, the second electrode of the first transistor is connected to the input end of the current source, and the output end of the current source is grounded; the first control switch is connected between the first electrode of the first transistor and the gate of the first transistor; the second control switch is connected between the second electrode of the first transistor and the gate of the first transistor; the output branch comprises a second transistor; the gate of the second transistor is connected to the gate of the first transistor in all the mirror branches to form a current mirror structure; the second electrode of the second transistor serves as the output end of the current generating circuit to provide the test current; the control circuit is specifically used for: Based on the determined value of the test current, at least one conduction control signal is output to the current generating circuit, and each of the at least one conduction control signal is used to control a corresponding first control switch to be turned on and a corresponding second control switch to be turned off, or to control a corresponding first control switch to be turned off and a corresponding second control switch to be turned on, so as to control the current generating circuit to provide the test current to the first pole of the zinc battery.

6. The internal resistance rapid testing system of a zinc battery according to claim 5, characterized in that: The output branch further includes a conduction transistor, a first electrode of the conduction transistor is connected to a second electrode of the second transistor, and the second electrode of the conduction transistor serves as an output end of the current generating circuit to provide the test current.

7. The internal resistance rapid testing system according to claim 4, characterized in that: The control circuit includes a battery management module and a controller; the battery management module is connected to the zinc battery; the controller is respectively connected to the battery management module, the current generating circuit and the sampling circuit; the battery management module is used to record the number of times the zinc battery is charged; the controller is used to: Obtaining the current charging number of the zinc battery, and determining the test current value according to the current charging number and a data mapping table; controlling the current generating circuit to provide the test current to the first electrode of the zinc battery based on the determined test current value; The sampling circuit is controlled to collect a sampling electrical signal of the second electrode of the zinc battery, and the internal resistance of the zinc battery is calculated according to the sampling electrical signal.

8. The internal resistance rapid testing system according to any one of claims 4 to 7, characterized in that: The sampled electrical signal includes a sampled voltage and a sampled current.

Images