Stray inductance value measurement method, device, equipment, system and storage medium

Abstract

The invention is suitable for the technical field of electrochemical energy storage modules, and provides a stray inductance value measurement method, device, equipment and system and a storage medium, and is realized based on a test circuit, and the test circuit comprises an overcurrent protection device, a switch and a conductive connection structure. The overcurrent protection device and the switch are connected in series between the positive electrode and the negative electrode of the electrochemical energy storage module through the conductive connection structure to form a test loop, and the method comprises the following steps: acquiring a voltage value of the test loop through the voltage detection structure under the condition that the switch is disconnected; under the condition that the switch is closed, the current value of the test loop in the target current rising stage is obtained through a current detection structure; based on the voltage value, the current value of the target current in the rising stage and the stray inductance value of the test circuit, the stray inductance value of the electrochemical energy storage module is obtained and output. The stray inductance value of the electrochemical energy storage module can be simply, efficiently and accurately measured and output, and the test circuit is simple in structure and easy to implement.

Description

Technical Field

[0001] The present application belongs to the field of electrochemical energy storage technology, and in particular, relates to a stray inductance value measurement method, device, equipment, system and storage medium. Background Art

[0002] With the vigorous development of the "double high (i.e. high proportion of new energy and high proportion of power electronic equipment)" power system, the application of new energy in the power system is becoming more and more extensive. Due to the characteristics of new energy such as volatility, randomness and instability, a large number of energy storage modules need to be configured in the power system to store new energy. Energy storage modules based on technologies such as pumped storage and electrochemical energy storage are widely used.

[0003] Depending on the specific topological structure of the electrochemical energy storage module when it is applied, in certain topological structures, it is necessary to accurately know the stray inductance value of the electrochemical energy storage module. Currently, there is a lack of measurement methods for the stray inductance value of the electrochemical energy storage module. Summary of the invention

[0004] In view of this, the embodiments of the present application provide a stray inductance value measurement method, device, equipment, system and storage medium, which can simply, efficiently and accurately measure the stray inductance value of the electrochemical energy storage module and output it, and the test circuit structure is simple and easy to implement.

[0005] A first aspect of an embodiment of the present application provides a stray inductance value measurement method, which is implemented based on a test circuit, wherein the test circuit includes an overcurrent protection device, a switch, and a conductive connection structure, wherein the overcurrent protection device and the switch are used to be connected in series between a positive electrode and a negative electrode of an electrochemical energy storage module through the conductive connection structure to form a test loop, and the method includes:

[0006] When the switch is disconnected, obtaining a voltage value of the test circuit through a voltage detection structure;

[0007] When the switch is closed, obtaining the current value of the test loop in the target current rising stage through the current detection structure;

[0008] Based on the voltage value, the current value in the rising phase of the target current and the stray inductance value of the test circuit, the stray inductance value of the electrochemical energy storage module is obtained and output;

[0009] The target current rising stage includes any current rising stage in the process from the closing of the switch to the opening of the overcurrent protection device.

[0010] In the first aspect, a test circuit consisting of an overcurrent protection device, a switch and a conductive connection structure is provided. The test circuit structure is simple and easy to implement. The overcurrent protection device and the switch are connected in series between the positive electrode and the negative electrode of the electrochemical energy storage module through the conductive connection structure to form a test circuit. When the switch is disconnected, the voltage value of the test circuit can be simply, efficiently and accurately obtained based on the voltage detection structure alone. In any current rising stage (that is, the target current rising stage) in the process from the switch closing to the overcurrent protection device disconnecting, the current value of the test circuit in the target current rising stage can be simply, efficiently and accurately obtained based on the current detection structure alone. Finally, based on the voltage value, the current value in the target current rising stage and the known stray inductance value of the test circuit, the stray inductance value of the electrochemical energy storage module can be further simply, efficiently and accurately obtained and output.

[0011] In a first implementation of the first aspect, the step of obtaining and outputting the stray inductance value of the electrochemical energy storage module based on the voltage value, the current value in the rising phase of the target current, and the stray inductance value of the test circuit includes:

[0012] Based on the voltage value and the current value of the target current in the rising phase, obtaining the stray inductance value of the test loop;

[0013] Based on the stray inductance value of the test loop and the stray inductance value of the test circuit, the stray inductance value of the electrochemical energy storage module is acquired and output.

[0014] The first implementation method of the first aspect can simply, efficiently and accurately obtain the stray inductance value of the test loop based on the voltage value and the current value in the rising stage of the target current; and then based on the stray inductance value of the test loop and the stray inductance value of the test circuit, the stray inductance value of the electrochemical energy storage module can be further simply, efficiently and accurately obtained and output.

[0015] Based on the first implementation of the first aspect, in a second implementation of the first aspect, acquiring the stray inductance value of the test loop based on the voltage value and the current value in the rising phase of the target current includes:

[0016] Based on the voltage value and the current value of the target current in the rising phase, obtaining the resistance value and the inductance value of the test loop;

[0017] The step of obtaining and outputting the stray inductance value of the electrochemical energy storage module based on the stray inductance value of the test loop and the stray inductance value of the test circuit comprises:

[0018] Based on the resistance value of the test loop and the resistance value of the test circuit, obtaining and outputting the resistance value of the electrochemical energy storage module;

[0019] Based on the inductance value of the test loop and the inductance value of the test circuit, the inductance value of the electrochemical energy storage module is acquired and output.

[0020] The second implementation method of the first aspect firstly can simply, efficiently and accurately obtain the two stray inductance values, namely the resistance value and the inductance value of the test loop, based on the voltage value and the current value in the rising stage of the target current, and then based on the resistance value of the test loop and the resistance value of the test circuit, can further simply, efficiently and accurately obtain the stray inductance value of the electrochemical energy storage module and output the resistance value in . Similarly, based on the inductance value of the test loop and the inductance value of the test circuit, can further simply, efficiently and accurately obtain the stray inductance value of the electrochemical energy storage module and output the inductance value in .

[0021] Based on the second implementation of the first aspect, in a third implementation of the first aspect, the expression of the current value in the target current rising stage is:

[0022]

[0023] Among them, I(t) represents the current value at any time t in the rising stage of the target current, V represents the voltage value, R represents the resistance value of the test loop, L represents the inductance value of the test loop, and e represents a natural constant.

[0024] The third implementation method of the first aspect utilizes the expressions between the voltage value, current value, resistance value and inductance value of the test loop at any time in the target current rising stage. When the voltage value and current value at different times in the target current rising stage are known, the voltage value and current value at different times in the target current rising stage are substituted into the expressions, and then the expressions at different times in the target current rising stage are solved jointly, so that the resistance value and inductance value of the test loop can be obtained simply, efficiently and accurately.

[0025] Based on the first aspect or any one of the first to third implementations of the first aspect, in a fourth implementation of the first aspect, acquiring the current value of the test loop in the target current rising stage through the current detection structure includes:

[0026] Acquiring the current value from the closing of the switch to the disconnection of the overcurrent protection device through the current detection structure;

[0027] Determine the peak value of the current value during the process from when the switch is closed to when the overcurrent protection device is opened;

[0028] Based on the current value in the process from when the switch is closed to when the current value reaches the target current value, obtaining the current value of the test loop in the target current rising stage;

[0029] The target current value is a preset ratio of the peak value, the preset ratio is greater than 0% and less than or equal to 100%, and the target current rising stage includes any stage in the process from when the switch is closed to when the current value reaches the target current value.

[0030] The fourth implementation method of the first aspect is based on the current detection structure, which can simply, efficiently and accurately obtain the current value in the process from switch closure to overcurrent protection device disconnection; on this basis, further determine the peak current value in the process from switch closure to overcurrent protection device disconnection; and then based on the current value in the process from switch closure to the current value reaching the target current value, the current value of the test loop in the target current rising stage can be simply, efficiently and accurately obtained; wherein, by setting the target current value to a preset ratio of the peak value, so that the preset ratio is greater than 0% and less than or equal to 100%, the target current rising stage is set to include any stage in the process from switch closure to the current value reaching the target current value, which has high flexibility.

[0031] Based on the fourth implementation manner of the first aspect, in a fifth implementation manner of the first aspect, after acquiring the current value in the process from closing the switch to disconnecting the overcurrent protection device through the current detection structure, the method includes:

[0032] Based on the current value in the process from closing the switch to opening the overcurrent protection device, generating a first time-current curve of the current value changing with time;

[0033] The determining of the peak value of the current value during the process from when the switch is closed to when the overcurrent protection device is disconnected comprises:

[0034] Determining, based on the peak of the first time-current curve, a peak value of a current value during a process from when the switch is closed to when the overcurrent protection device is opened;

[0035] The step of obtaining the current value of the test loop in the target current rising stage based on the current value in the process from when the switch is closed to when the current value reaches the target current value comprises:

[0036] Based on the first time-current curve and the target current value, intercepting a second time-current curve of the current value changing with time during the process from when the switch is closed to when the current value reaches the target current value;

[0037] Based on the second time-current curve, a current value of the test loop in the target current rising stage is obtained.

[0038] The fifth implementation method of the first aspect first generates a first time-current curve that can intuitively reflect the change of current value over time based on the current value in the process from switch closure to overcurrent protection device disconnection; then, based on the peak of the first time-current curve, the peak value of the current value in the process from switch closure to overcurrent protection device disconnection can be simply, efficiently and accurately determined; then, based on the first time-current curve and the peak value of a preset ratio (that is, the target current value) set in advance, the second time-current curve of the current value changing with time in the process from switch closure to the current value reaching the target current value can be intercepted according to actual needs, with high flexibility; finally, based on the second time-current curve, the current value of the test loop in the target current rising stage can be simply, efficiently and accurately obtained according to actual needs, with high flexibility.

[0039] Based on the first aspect or any one of the first to fifth implementations of the first aspect, in a sixth implementation of the first aspect, the electrochemical energy storage module is applied to an electrical box or an electrical cabinet, and the overcurrent protection device is a fuse.

[0040] A sixth implementation of the first aspect can effectively reduce the cost of the test circuit by using the overcurrent protection device of an electric box or electric cabinet when the electrochemical energy storage module is applied to the electric box or electric cabinet.

[0041] Based on the first aspect or any one of the first to sixth implementations of the first aspect, in a seventh implementation of the first aspect, before obtaining the stray inductance value of the electrochemical energy storage module based on the voltage value, the current value in the target current rising stage, and the stray inductance value of the test circuit and outputting it, the method includes:

[0042] Based on the bridge method, the stray inductance value of the test circuit is obtained.

[0043] The seventh implementation method of the first aspect is based on the bridge method, which can simply, efficiently and accurately obtain the stray inductance value of the test circuit.

[0044] A second aspect of an embodiment of the present application provides a stray inductance value measuring device, which is implemented based on a test circuit. The test circuit includes an overcurrent protection device, a switch, and a conductive connection structure. The overcurrent protection device and the switch are used to be connected in series between the positive electrode and the negative electrode of the electrochemical energy storage module through the conductive connection structure to form a test loop. The device includes:

[0045] A voltage acquisition unit, used for acquiring a voltage value of the test loop through a voltage detection structure when the switch is disconnected;

[0046] A current acquisition unit, used for acquiring the current value of the test loop in the target current rising stage through the current detection structure when the switch is closed;

[0047] A stray inductance value acquisition unit, configured to acquire and output the stray inductance value of the electrochemical energy storage module based on the voltage value, the current value in the rising stage of the target current, and the stray inductance value of the test circuit;

[0048] The target current rising stage includes any current rising stage in the process from the closing of the switch to the opening of the overcurrent protection device.

[0049] A third aspect of an embodiment of the present application provides a stray inductance value measuring device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the stray inductance value measuring device is used to be connected to the current detection structure and the voltage detection structure, respectively, or the stray inductance value measuring device is used to be connected to the switch, the current detection structure, and the voltage detection structure, respectively, and when the processor executes the computer program, the steps of the stray inductance value measuring method provided in the first aspect of the embodiment of the present application are implemented.

[0050] A fourth aspect of the embodiments of the present application provides a stray inductance value measurement system, comprising the stray inductance value measurement device provided by the third aspect of the embodiments of the present application and the test circuit.

[0051] A fifth aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the stray inductance value measurement method provided in the first aspect of the embodiment of the present application are implemented.

[0052] It can be understood that the beneficial effects of the second to fifth aspects mentioned above can be found in the relevant description of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0054] Figure 1 It is the topological structure of the three-phase AC chain energy storage converter system provided in the embodiment of the present application;

[0055] Figure 2 This is the topological structure of the DC energy storage valve system provided in the embodiment of the present application;

[0056] Figure 3It is the topological structure of the energy storage converter system provided in the embodiment of the present application;

[0057] Figure 4 It is an equivalent model of the electrochemical energy storage module provided in the embodiment of the present application;

[0058] Figure 5 It is the first equivalent model of the test circuit provided in the embodiment of the present application;

[0059] Figure 6 It is the second equivalent model of the test circuit provided in the embodiment of the present application;

[0060] Figure 7 This is a schematic diagram of a first flow chart of a stray inductance value measurement method provided in an embodiment of the present application;

[0061] Figure 8 1 is a second flow chart of the stray inductance value measurement method provided in an embodiment of the present application;

[0062] Fig. 9 1 is a third flow chart of the stray inductance value measurement method provided in the embodiment of the present application;

[0063] Fig.10 is a schematic diagram of a second time-current curve provided in an embodiment of the present application;

[0064] Fig.11 4 is a schematic diagram of a fourth flow chart of a stray inductance value measurement method provided in an embodiment of the present application;

[0065] Fig.12 is a structural schematic diagram of a stray inductance value measuring device provided in an embodiment of the present application;

[0066] Fig.13 It is a structural schematic diagram of a stray inductance value measuring device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0067] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0068] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or combinations thereof.

[0069] It should also be understood that the term “and / or” used in the specification and appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0070] As used in the specification and appended claims of this application, the term "if" can be interpreted as "when" or "uponce" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "uponce it is determined" or "in response to determining" or "uponce [described condition or event] is detected" or "in response to detecting [described condition or event]", depending on the context.

[0071] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0072] References to "one embodiment" or "some embodiments" etc. described in the specification of this application mean that one or more embodiments of the present application include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0073] The embodiment of the present application provides a stray inductance value measurement method applied to a stray inductance value measurement device, which can be executed by a processor of the stray inductance value measurement device when running a computer program with corresponding functions, and is implemented by relying on a test circuit composed of an overcurrent protection device, a switch and a conductive connection structure. The test circuit structure is simple and easy to implement. When the switch is disconnected, the voltage value of the test loop can be simply, efficiently and accurately obtained only through the voltage detection structure, and in any current rising stage (that is, the target current rising stage) in the process from the switch closing to the overcurrent protection device disconnecting, the current value of the test loop in the target current rising stage can be simply, efficiently and accurately obtained only through the current detection structure. Finally, based on the voltage value, the current value in the target current rising stage and the known stray inductance value of the test circuit, the stray inductance value of the electrochemical energy storage module can be further simply, efficiently and accurately obtained and output, and the technical difficulty and cost are relatively low.

[0074] In the application, the stray inductance value measuring device can also be any computing device that can be connected to the current detection structure and the voltage detection structure, or connected to the switch, the current detection structure and the voltage detection structure, and can obtain the current value detected by the current detection structure and the voltage value detected by the voltage detection structure, and based on the obtained current value and voltage value, combined with the known stray inductance value of the test circuit, analyze and calculate, and finally obtain the stray inductance value of the electrochemical energy storage module and output it. The computing device can be an industrial computer, a server, a mobile phone, a tablet computer, a laptop computer, a personal computer (Personal Computer, PC), a netbook, a personal digital assistant (Personal Digital Assistant, PDA), etc. The embodiment of the present application does not impose any restrictions on the specific type of the stray inductance value measuring device.

[0075] In applications, the switch may be a mechanical switch that supports manual operation (e.g., a rotary band switch, a straight key (piano key) band switch, a toggle band switch, a dial (dial) band switch, etc.) or an electronic switch that supports electric operation (e.g., an electronic switch implemented based on a controllable electronic driver such as a thyristor, a transistor, a field effect transistor, a thyristor, a relay, etc.), or a switch that supports both manual and electric operation, such as a circuit breaker (CB). In the case where the switch supports manual operation, the switch device may be manually controlled by the user to achieve manual closing or manual opening; in the case where the switch supports electric operation, the switch device may be automatically controlled by an inductance value measuring device to achieve automatic closing or automatic opening.

[0076] In applications, the conductive connection structure is a connection bar, and may also include a plurality of conductive wires; wherein the connection bar and the conductive wires may be implemented based on any good electrical conductor, for example, the connection bar may be a copper bar, and the conductive wires may be copper wires.

[0077] In application, based on the principle that the voltage of parallel circuits is equal, the voltage detection structure can be based on a first voltmeter connected in parallel between the positive and negative electrodes of the electrochemical energy storage module, and the voltage value of the test circuit can be obtained based on the reading of the first voltmeter; or, the voltage detection structure can also be implemented based on a voltage detection resistor and a first ammeter connected in series between the positive and negative electrodes of the electrochemical energy storage module, the resistance value of the voltage detection resistor is known, and the voltage value of the test circuit can be obtained based on the resistance value of the voltage detection resistor and the reading of the first ammeter according to Ohm's law. Based on the principle that the current of a series circuit is equal everywhere, the current detection structure can be implemented based on a second ammeter connected in series in the test circuit, and the current value of the test circuit can be obtained based on the reading of the second ammeter; or, the current detection structure can be implemented based on a current detection resistor connected in series in the test circuit and a second voltmeter connected in parallel at both ends of the current detection resistor, the resistance value of the current detection resistor is known, and the current value of the test circuit can be obtained based on the resistance value of the current detection resistor and the reading of the second voltmeter according to Ohm's law. The test circuit may include a voltage detection structure and a current detection structure.

[0078] In application, the electrochemical energy storage module can be one of a single cell, a battery pack, an energy storage structure consisting of multiple battery packs connected in series, an energy storage structure consisting of multiple battery packs connected in parallel, an energy storage structure consisting of multiple battery packs connected in series and parallel, etc., that is, the stray inductance value measurement method of the embodiment of the present application can be used to measure the stray inductance value of any energy storage structure with a single cell as the smallest energy storage unit.

[0079] In applications, electrochemical energy storage modules can be applied to AC direct-mounted energy storage systems (e.g., chain-type energy storage inverters), DC direct-mounted energy storage systems (e.g., DC energy storage valves), energy storage inverters and other energy storage systems. When applied to these energy storage systems, electrochemical energy storage modules can exist in the form of electrical boxes or electrical cabinets.

[0080] like Figure 1 As shown, a topological structure of a three-phase AC chain energy storage converter system is shown as an example; wherein, u a 、u b 、u c Respectively represent the voltage of phase a, phase b, and phase c of the three-phase AC power supply, i a 、i b 、i c They represent the current of phase a, phase b, and phase c of the three-phase AC power supply, respectively. a , L b , L c represents the main circuit inductor, 11 represents the full rectifier bridge, 12 represents the capacitor, 13 represents the branch circuit inductor, 14 represents the electrochemical energy storage module, and there may be more than one electrochemical energy storage module;

[0081] Figure 1The number of electrochemical energy storage modules is shown as exemplarily more than 9, and the nominal capacities of different electrochemical energy storage modules may be the same or different.

[0082] like Figure 2 As shown, a topological structure of a DC energy storage valve system is exemplarily shown; wherein K represents a switch, L represents an inductor, 21, 22, ..., 2(M-1), 2M represent energy storage submodules, M is a natural number greater than 0, and there may be more than one energy storage submodule;

[0083] Figure 2 The number of energy storage submodules is exemplarily shown as being more than 4, the nominal capacities of different energy storage submodules may be the same or different, and the electrochemical energy storage module may include one or more than two energy storage submodules.

[0084] like Figure 3 As shown, a topological structure of an energy storage converter system is exemplarily shown; wherein 31 represents a step-up transformer, 321, 322, ..., 32N represent energy storage converters, 331, 332, ..., 33N represent energy storage submodules, wherein N is a natural number greater than 0, and there may be more than one energy storage submodule;

[0085] Figure 3 The number of energy storage submodules is exemplarily shown as more than 3, the nominal capacities of different energy storage submodules may be the same or different, and the electrochemical energy storage module may include one or more than two energy storage submodules.

[0086] In application, the stray inductance value measurement method provided in the embodiment of the present application can be used to accurately measure the stray inductance value of the electrochemical energy storage module according to the following principle:

[0087] like Figure 4 As shown, an equivalent model of an electrochemical energy storage module is exemplarily shown, including a voltage source (not shown in the figure) connected in series from beginning to end, a first inductor L0, a first resistor R0 and n resistor-capacitor circuits;

[0088] Wherein, the first inductor L0 and the first resistor R0 are equivalent stray inductances of the electrochemical energy storage module;

[0089] The i-th RC circuit consists of the i-th equivalent capacitor C of an energy storage submodule. i and the i-th internal resistance R i Parallel configuration (i.e., the first RC circuit is formed by the equivalent capacitor C1 and internal resistor R1 of the first energy storage submodule in parallel, the second RC circuit is formed by the equivalent capacitor C2 and internal resistor R2 of the second energy storage submodule in parallel, ..., the nth RC circuit is formed by the equivalent capacitor C n and internal resistance R nParallel connection), i∈[1,n], n is a natural number greater than 0, that is, there can be more than one energy storage submodule, the nominal capacities of different energy storage submodules can be the same or different, and the electrochemical energy storage module includes all energy storage submodules;

[0090] Figure 4 The example in FIG. 1 shows a case where the number of energy storage submodules is more than 3;

[0091] based on Figure 4 The equivalent model of the electrochemical energy storage module shown can indirectly obtain the stray inductance value of the electrochemical energy storage module by using a short-circuit current test method. The short-circuit current test method is to short-circuit the resistance-capacitance circuit in the equivalent model of the electrochemical energy storage module to form a path, so that the electrochemical energy storage module can be regarded as a target equivalent model consisting of a voltage source, a first inductor L0, and a first resistor R0 connected in series in sequence from beginning to end;

[0092] Based on the target equivalent model, in order to measure the stray inductance value of the electrochemical energy storage module, an embodiment of the present application provides a test circuit, including an overcurrent protection device, a switch and a conductive connection structure, wherein the overcurrent protection device and the switch are connected in series between the positive electrode and the negative electrode of the electrochemical energy storage module through the conductive connection structure to form a test circuit;

[0093] When the electrochemical energy storage module is applied to a device such as an electric box or an electric cabinet that has a built-in overcurrent protection device (for example, a fuse), there is no need to provide an additional overcurrent protection device;

[0094] based on Figure 4 The equivalent model of the electrochemical energy storage module shown in Figure 5 and Figure 6 As shown, the embodiment of the present application provides an equivalent model of a test circuit, including a second inductor L2, a second resistor R2, an overcurrent protection device (not shown in the figure), a switch K1, an ammeter (a device marked as "A" in the figure) and a voltmeter (a device marked as "V" in the figure), the second inductor L2, the second resistor R2, the overcurrent protection device, the switch K1 and the ammeter are used to be sequentially connected in series between the positive electrode + and the negative electrode - of the electrochemical energy storage module (the device marked as "+" and "-" in the figure) to form a test circuit, and the voltmeter is used to be connected in parallel between the positive electrode and the negative electrode of the electrochemical energy storage module to measure the voltage of the electrochemical energy storage module;

[0095] Wherein, the second inductor L2 and the second resistor R2 are equivalent stray inductances of the test circuit;

[0096] The connection method of the voltmeter in parallel between the positive and negative electrodes of the electrochemical energy storage module is not limited, as long as the voltage detection structure can measure the voltage value of the test circuit. Figure 5The first connection mode of the voltmeter is shown as an example. The voltmeter is connected between the end of the second resistor R2 away from the second inductor L2 and the output end of the switch K1. Figure 6 The second connection mode of the voltmeter is shown as an example, where the voltmeter is connected between the input terminal and the output terminal of the switch K1;

[0097] When switch K1 is disconnected, the test circuit is open. Figure 5 and Figure 6 In the connection mode of the voltmeter shown, the voltage value of the test circuit measured by the voltmeter is the same;

[0098] When the switch K1 is closed, the test circuit is short-circuited, and the current value of the test circuit is measured by the ammeter. Then, according to the voltage value measured by the voltmeter when the switch K1 is open, the stray inductance value of the test circuit can be calculated based on Ohm's law;

[0099] Since the test loop is short-circuited when the switch K1 is closed, the resistance-capacitance circuit in the equivalent model of the electrochemical energy storage module is short-circuited to form a path, and the electrochemical energy storage module can be regarded as a target equivalent model. Therefore, the stray inductance value of the test loop is equal to the sum of the stray inductance value of the electrochemical energy storage module (that is, the value of the first inductor L0 and the first resistor R0) and the stray inductance value of the test circuit (that is, the value of the second inductor L2 and the second resistor R2). It is only necessary to know the stray inductance value of the test circuit to calculate the stray inductance value of the electrochemical energy storage module.

[0100] Based on the principle of the above short-circuit current test method, such as Figure 7 As shown, the stray inductance measurement method provided in the embodiment of the present application includes the following steps S101 to S103:

[0101] Step S101, when the switch is disconnected, obtain the voltage value of the test circuit through the voltage detection structure, and enter step S102.

[0102] In application, based on the principle of the above short-circuit current test method, when the switch K1 is disconnected, the test loop is open, and the voltage value of the test loop can be directly measured by the voltage detection structure.

[0103] Step S102: When the switch is closed, the current value of the test loop in the target current rising stage is obtained through the current detection structure, and then the process goes to step S103.

[0104] In application, based on the principle of the above short-circuit current test method, when the switch is closed, the test circuit is short-circuited. At this time, the voltage source discharges the stray inductance of the entire test circuit, and the current value of the test circuit measured by the current detection structure changes with time until the overcurrent protection device blows and causes the test circuit to disconnect. In the process from the start of the switch closure to the disconnection of the overcurrent protection device, the current value of the test circuit measured by the current detection structure first rises and then decreases with time until it drops to 0 when the overcurrent protection device blows. The duration of the whole process is equal to the blowing time of the overcurrent protection device. The target current rising stage includes any current rising stage in the process from the start of the switch closure to the disconnection of the overcurrent protection device. Only the current value of the current rising stage is taken, and the stray inductance value of the entire test circuit is calculated in combination with the voltage value of the test circuit measured based on the voltage detection structure.

[0105] In application, the target current rising stage may include any stage in the process from the start of the switch closing (at this time, the current value measured by the current detection structure is 0, that is, 0% of the peak value) to the current value measured by the current detection structure reaching the peak value (at this time, the current value measured by the current detection structure is the maximum, that is, 100% of the peak value). For example, the target current rising stage may include the entire stage in the process of the current value rising from 0% to 100% of the peak value, a continuous sub-stage or multiple discontinuous sub-stages. The more the number of all sub-stages of the target current rising stage or the longer the total duration, the more accurate the stray inductance value of the test loop calculated based on the current value; the fewer the number of all sub-stages of the target current rising stage or the shorter the total duration, the more it can reduce the amount of calculation when calculating the stray inductance value of the test loop based on the current value, and improve the calculation efficiency; the number of all sub-stages of the target current rising stage is moderate or the total duration is moderate, then it can take into account the accuracy and calculation efficiency of the stray inductance value obtained by calculating the test loop based on the current value.

[0106] like Figure 8 As shown, in one embodiment, step S102 includes the following steps S201 to S203:

[0107] Step S201, obtaining the current value in the process from the switch closing to the overcurrent protection device opening through the current detection structure, and then proceeding to step S202.

[0108] Step S202, determining the peak value of the current value during the process from the switch closing to the overcurrent protection device opening, and proceeding to step S203;

[0109] Step S203: Based on the current value in the process from when the switch is closed to when the current value reaches the target current value, the current value of the test loop in the target current rising stage is obtained.

[0110] In applications, since the fusing time of the overcurrent protection device is related to its current carrying capacity and is in the millisecond (ms) level, which is very fast, it is difficult to directly obtain the current value in the current rising stage based on the current detection structure. It is necessary to first obtain the current value in the entire process from the start time of switch closure to the time when the overcurrent protection device is disconnected, and then determine the peak current value based on the change of the current value in the entire process. The process from the start time of switch closure to the current value reaching the peak value is the current rising stage, and then determine the target current value from the current rising stage. Finally, based on the current value in the process from the start time of switch closure to the current value reaching the target current value, the current value in the target current rising stage can be obtained.

[0111] In application, the target current value can be a preset ratio of the peak value, and the preset ratio can be set to any ratio greater than 0% and less than or equal to 100% according to actual needs, for example, any ratio between 70% and 90%, specifically 70%, 75%, 80%, 85%, 90%. Since the current value obtained based on the current detection structure is most accurate in the process of rising from 0% of the peak value to 70% to 90%, therefore, setting the preset ratio to 70% to 90% can effectively improve the accuracy of the stray inductance value obtained by the test loop based on the current value calculation. The target current rising stage can include the entire stage, a continuous sub-stage, or multiple intermittent sub-stages in the process of the current value rising from 0% of the peak value to the preset ratio (70% to 90%) of the peak value.

[0112] like Fig. 9 As shown, in one embodiment, after step S201, the following steps are included:

[0113] Step S301, based on the current value in the process from the switch closing to the overcurrent protection device opening, generate a first time-current curve of the current value changing with time, and proceed to step S302;

[0114] Step S202 includes:

[0115] Step S302, based on the peak of the first time-current curve, determine the peak value of the current value during the process from the switch closing to the overcurrent protection device opening, and proceed to step S303;

[0116] Step S203 includes:

[0117] Step S303, based on the first time-current curve and the target current value, intercept a second time-current curve of the current value changing with time during the process from when the switch is closed to when the current value reaches the target current value, and proceed to step S304;

[0118] Step S304: Based on the second time-current curve, obtain the current value of the test loop in the target current rising stage.

[0119] In the application, in order to more intuitively display the process of current value changing with time and quickly obtain the current value of the target current rising stage, a first time-current curve of the current value changing with time can be generated based on the current value in the entire process from the start time of switch closure to the time when the overcurrent protection device is disconnected, and then the peak of the first time-current curve can be determined by numerical comparison method or image recognition method, and the current value corresponding to the peak is the peak value of the current value. Then, a sliding window search method or image recognition method is used to intercept the second time-current curve of the current value changing with time in the process from the start time of switch closure to the current value reaching the target current value (that is, the preset proportion of the peak value) in the first time-current curve. Finally, according to the entire second time-current curve, or a part of the curve or multiple parts of the second time-current curve, the current value in the time period corresponding to this part of the curve is obtained, that is, the current value of the test loop in the target current rising stage is obtained.

[0120] like Fig.10 As shown, a schematic diagram of a second time-current curve is exemplarily shown; wherein the horizontal axis coordinate is time, the unit is second (S), and the vertical axis coordinate is current, the unit is ampere (A).

[0121] Step S103: based on the voltage value, the current value in the target current rising stage and the stray inductance value of the test circuit, the stray inductance value of the electrochemical energy storage module is obtained and output.

[0122] In the application, the current value in the target current rising stage is a function of the voltage value of the test circuit, the stray inductance value of the test circuit and time. Therefore, based on the two known parameters of the voltage value of the test circuit and the current value that changes with time in the target current rising stage, the stray inductance value of the test circuit can be obtained. Since the stray inductance value of the test circuit includes the stray inductance value of the test circuit and the stray inductance value of the electrochemical energy storage module, the stray inductance value of the electrochemical energy storage module can be obtained based on the two known parameters of the stray inductance value of the test circuit and the stray inductance value of the test circuit.

[0123] In applications, the output methods of the stray inductance value of the electrochemical energy storage module include but are not limited to display, voice broadcast, etc. Correspondingly, the stray inductance value measuring device can be connected to or include a display screen, an audio playback device, etc.; wherein the display screen can be a touch display screen.

[0124] like Fig.11 As shown, in one embodiment, step S103 includes the following steps S401 and S402:

[0125] Step S401, based on the voltage value and the current value of the target current rising stage, obtain the stray inductance value of the test loop, and proceed to step S402;

[0126] Step S402: Based on the stray inductance value of the test loop and the stray inductance value of the test circuit, the stray inductance value of the electrochemical energy storage module is obtained and output.

[0127] In application, the stray inductance value of the test loop includes the total stray inductance value of the overcurrent protection device, the switch, the conductive connection structure and the electrochemical energy storage module. When the electrochemical energy storage module is applied to equipment with built-in overcurrent protection devices such as electrical boxes or electrical cabinets, the stray inductance value of the overcurrent protection device can be ignored. Before the overcurrent protection device and the switch are used to form a test loop in series between the positive and negative electrodes of the electrochemical energy storage module through the conductive connection structure, the total stray inductance value of the overcurrent protection device, the switch and the conductive connection structure can be measured based on the bridge method to obtain the stray inductance value of the test circuit. The stray inductance value of the test loop is equal to the sum of the stray inductance value of the test circuit and the stray inductance value of the electrochemical energy storage module, that is, the stray inductance value of the test loop is subtracted from the stray inductance value of the test circuit to obtain the stray inductance value of the electrochemical energy storage module.

[0128] In one embodiment, step S401 includes:

[0129] Based on the voltage value and the current value in the rising phase of the target current, the resistance value and the inductance value of the test loop are obtained;

[0130] Step S402 includes:

[0131] Based on the resistance value of the test loop and the resistance value of the test circuit, the resistance value of the electrochemical energy storage module is obtained and output;

[0132] Based on the inductance value of the test loop and the inductance value of the test circuit, the inductance value of the electrochemical energy storage module is obtained and output.

[0133] In application, the stray inductance value includes resistance value and inductance value, the resistance value of the test loop is equal to the sum of the resistance value of the test circuit and the resistance value of the electrochemical energy storage module, and the inductance value of the test loop is equal to the sum of the resistance value of the test circuit and the inductance value of the electrochemical energy storage module. Therefore, the resistance value of the electrochemical energy storage module can be obtained by subtracting the resistance value of the test circuit from the resistance value of the test loop, and the inductance value of the electrochemical energy storage module can be obtained by subtracting the resistance value of the test circuit from the inductance value of the test loop; wherein, the resistance value and inductance value of the test circuit can be measured based on the bridge method, and the resistance value of the test circuit can be measured separately based on the resistance meter.

[0134] In one embodiment, the expression of the current value in the target current rising stage is:

[0135]

[0136] Wherein, I(t) represents the current value at any time t during the rising phase of the target current, V represents the voltage value, R represents the resistance value of the test loop, L represents the inductance value of the test loop, and e represents a natural constant.

[0137] In the application, the current value in the target current rising stage is a function of the voltage value of the test loop, the resistance value and inductance value of the test loop and time. Therefore, the two known parameters, the voltage value of the test loop and the current value that changes with time in the target current rising stage, are substituted into the above function expression to obtain expressions at multiple different times and solved simultaneously, so as to obtain the resistance value and inductance value of the test loop. Then, the resistance value of the test circuit is subtracted from the resistance value of the test loop to obtain the resistance value of the electrochemical energy storage module. The inductance value of the electrochemical energy storage module is subtracted from the resistance value of the test loop to obtain the inductance value of the electrochemical energy storage module. In order to improve accuracy, as many expressions at different times as possible can be solved simultaneously to obtain multiple groups of test loop resistance and inductance values, and then the average of these resistance values ​​can be taken as the final test loop resistance value, and the average of these inductance values ​​can be taken as the final test loop resistance value; the median of these resistance values ​​can be taken as the final test loop resistance value, and the median of these inductance values ​​can be taken as the final test loop resistance value; the maximum and minimum values ​​of these resistance values ​​can be removed first, and then the average value can be taken as the final test loop resistance value, and the maximum and minimum values ​​of these inductance values ​​can be removed, and then the average value can be taken as the final test loop resistance value.

[0138] It should be understood that the size of the serial numbers of the steps in the above embodiments 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.

[0139] like Fig.12 As shown, the embodiment of the present application also provides a stray inductance value measuring device, which is used to perform the steps in the above-mentioned stray inductance value measuring method embodiment. The stray inductance value measuring device can be a virtual device in the stray inductance value measuring device, which is run by the processor of the stray inductance value measuring device, or it can be the stray inductance value measuring device itself.

[0140] like Fig.12 As shown, the stray inductance value measuring device 100 provided in the embodiment of the present application includes:

[0141] The voltage acquisition unit 101 is used to acquire the voltage value of the test circuit through the voltage detection structure when the switch is disconnected;

[0142] The current acquisition unit 102 is used to acquire the current value of the test loop in the target current rising stage through the current detection structure when the switch is closed;

[0143] A stray inductance value acquisition unit 103, used to acquire and output the stray inductance value of the electrochemical energy storage module based on the voltage value, the current value in the rising stage of the target current and the stray inductance value of the test circuit;

[0144] The target current rising stage includes any current rising stage in the process from the switch closing to the overcurrent protection device disconnecting.

[0145] In one embodiment, the stray inductance value acquisition unit is further configured to acquire the stray inductance value of the test circuit based on a bridge method.

[0146] In applications, each unit in the stray inductance value measuring device may be a software program unit, or may be implemented by different logic circuits integrated in a processor, or may be implemented by multiple distributed processors.

[0147] like Fig.13 As shown, the embodiment of the present application also provides a stray inductance value measuring device 200 including: at least one processor 201 ( Fig.13 Only one processor is shown in the figure), a memory 202, and a computer program 203 stored in the memory 202 and executable on at least one processor 201. When the processor 201 executes the computer program 203, the steps in any of the above-mentioned stray inductance value measurement method embodiments are implemented.

[0148] In application, the stray inductance value measuring device may include, but is not limited to, a processor and a memory. The stray inductance value measuring device may also be used to connect to a current detection structure and a voltage detection structure respectively, or the stray inductance value measuring device may also be used to connect to a switch, a current detection structure and a voltage detection structure respectively. Those skilled in the art may understand that Fig.13 It is only an example of a stray inductance value measuring device, and does not constitute a limitation on the stray inductance value measuring device. It may include more or fewer components than shown in the figure, or combine certain components, or different components, for example, it may also include a communication module, an input / output device, a network access device, etc. The input / output device may include a display screen, a touch screen, a touch display screen, an audio playback device, a mouse, a keyboard, a button, a communication interface, etc.

[0149] In applications, the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0150] In application, the memory may be an internal storage unit of the stray inductance value measuring device in some embodiments, such as a hard disk or memory of the stray inductance value measuring device. The memory may also be an external storage device of the stray inductance value measuring device in other embodiments, such as a plug-in hard disk equipped on the stray inductance value measuring device, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. Further, the memory may also include both an internal storage unit of the stray inductance value measuring device and an external storage device. The memory is used to store an operating system, an application program, a boot loader (Boot Loader), data, and other programs, such as program code of a computer program, etc. The memory may also be used to temporarily store data that has been output or is to be output.

[0151] In applications, the display screen can be a thin film transistor liquid crystal display (TFT-LCD), a liquid crystal display (LCD), an organic electroluminesence display (OLED), a quantum dot light emitting diode (QLED) display screen, a seven-segment or eight-segment digital tube, etc.

[0152] In the application, the communication module can be set to any device that can directly or indirectly perform long-distance wired or wireless communication according to actual needs. For example, the communication module can provide communication solutions including wireless local area networks (WLAN) (such as Wi-Fi networks), Bluetooth, Zigbee, mobile communication networks, GNSS, frequency modulation (FM), near field communication technology (NFC), infrared technology (IR), etc., which are applied to network devices. The communication module may include an antenna, and the antenna may have only one array element or an antenna array including multiple array elements. The communication module can receive electromagnetic waves through the antenna, frequency modulate and filter the electromagnetic wave signal, and send the processed signal to the processor. The communication module can also receive the signal to be sent from the processor, frequency modulate and amplify it, and convert it into electromagnetic waves for radiation through the antenna.

[0153] The embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the above-mentioned embodiments of the stray inductance value measurement method can be implemented.

[0154] The embodiment of the present application provides a computer program product. When the computer program product is run on a stray inductance value measuring device, the stray inductance value measuring device can implement the steps in the above-mentioned embodiments of the stray inductance value measuring method when executing.

[0155] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the process in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may at least include: any entity or device capable of carrying the computer program code to the photographic stray inductance value measuring device, recording medium, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal and software distribution medium. For example, a USB flash drive, a mobile hard disk, a disk or an optical disk.

[0156] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0157] Those of ordinary skill in the art will appreciate that the units 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.

[0158] In the embodiments provided in the present application, it should be understood that the disclosed stray inductance value measuring device and method can be implemented in other ways. For example, the stray inductance value measuring device embodiment described above is only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, 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 an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0159] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0160] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for measuring stray inductance, characterized in that: Based on the test circuit implementation, the test circuit includes an overcurrent protection device, a switch and a conductive connection structure, the overcurrent protection device and the switch are used to be connected in series between the positive electrode and the negative electrode of the electrochemical energy storage module through the conductive connection structure to form a test loop, and the method includes: When the switch is disconnected, obtaining a voltage value of the test circuit through a voltage detection structure; When the switch is closed, obtaining the current value of the test loop in the target current rising stage through the current detection structure; Based on the voltage value, the current value in the rising phase of the target current and the stray inductance value of the test circuit, the stray inductance value of the electrochemical energy storage module is obtained and output; The target current rising stage includes any current rising stage in the process from the closing of the switch to the opening of the overcurrent protection device.

2. The stray inductance measurement method according to claim 1, characterized in that: The step of obtaining and outputting the stray inductance value of the electrochemical energy storage module based on the voltage value, the current value in the rising stage of the target current, and the stray inductance value of the test circuit comprises: Based on the voltage value and the current value of the target current in the rising phase, obtaining the stray inductance value of the test loop; Based on the stray inductance value of the test loop and the stray inductance value of the test circuit, the stray inductance value of the electrochemical energy storage module is acquired and output.

3. The stray inductance measurement method according to claim 2, characterized in that: The step of obtaining the stray inductance value of the test loop based on the voltage value and the current value of the target current in the rising phase includes: Based on the voltage value and the current value of the target current in the rising phase, obtaining the resistance value and the inductance value of the test loop; The step of obtaining and outputting the stray inductance value of the electrochemical energy storage module based on the stray inductance value of the test loop and the stray inductance value of the test circuit comprises: Based on the resistance value of the test loop and the resistance value of the test circuit, obtaining and outputting the resistance value of the electrochemical energy storage module; Based on the inductance value of the test loop and the inductance value of the test circuit, the inductance value of the electrochemical energy storage module is acquired and output.

4. The stray inductance measurement method according to claim 3, characterized in that: The expression of the current value in the target current rising stage is: Among them, I(t) represents the current value at any time t in the rising stage of the target current, V represents the voltage value, R represents the resistance value of the test loop, L represents the inductance value of the test loop, and e represents a natural constant.

5. The stray inductance measurement method according to any one of claims 1 to 4, characterized in that: The step of obtaining the current value of the test loop during the target current rising phase through the current detection structure includes: Acquiring the current value from the closing of the switch to the disconnection of the overcurrent protection device through the current detection structure; Determine the peak value of the current value during the process from when the switch is closed to when the overcurrent protection device is opened; Based on the current value in the process from when the switch is closed to when the current value reaches the target current value, obtaining the current value of the test loop in the target current rising stage; The target current value is a preset ratio of the peak value, the preset ratio is greater than 0% and less than or equal to 100%, and the target current rising stage includes any stage in the process from when the switch is closed to when the current value reaches the target current value.

6. The stray inductance measurement method according to claim 5, characterized in that: After the current value in the process from the switch being closed to the overcurrent protection device being opened is obtained through the current detection structure, the method includes: Based on the current value in the process from closing the switch to opening the overcurrent protection device, generating a first time-current curve of the current value changing with time; The determining of the peak value of the current value during the process from when the switch is closed to when the overcurrent protection device is disconnected comprises: Determining, based on the peak of the first time-current curve, a peak value of a current value during a process from when the switch is closed to when the overcurrent protection device is opened; The step of obtaining the current value of the test loop in the target current rising stage based on the current value in the process from when the switch is closed to when the current value reaches the target current value comprises: Based on the first time-current curve and the target current value, intercepting a second time-current curve of the current value changing with time during the process from when the switch is closed to when the current value reaches the target current value; Based on the second time-current curve, a current value of the test loop in the target current rising stage is obtained.

7. The stray inductance measurement method according to any one of claims 1 to 4, characterized in that: The electrochemical energy storage module is applied to an electrical box or an electrical cabinet, and the overcurrent protection device is a fuse.

8. The stray inductance measurement method according to any one of claims 1 to 4, characterized in that: Before obtaining and outputting the stray inductance value of the electrochemical energy storage module based on the voltage value, the current value of the target current rising stage and the stray inductance value of the test circuit, the method includes: Based on the bridge method, the stray inductance value of the test circuit is obtained.

9. A stray inductance measurement device, characterized in that: Based on the test circuit implementation, the test circuit includes an overcurrent protection device, a switch and a conductive connection structure. The overcurrent protection device and the switch are used to be connected in series between the positive electrode and the negative electrode of the electrochemical energy storage module through the conductive connection structure to form a test circuit. The device includes: A voltage acquisition unit, used for acquiring a voltage value of the test loop through a voltage detection structure when the switch is disconnected; A current acquisition unit, used for acquiring the current value of the test loop in the target current rising stage through the current detection structure when the switch is closed; A stray inductance value acquisition unit, configured to acquire and output the stray inductance value of the electrochemical energy storage module based on the voltage value, the current value in the rising stage of the target current, and the stray inductance value of the test circuit; The target current rising stage includes any current rising stage in the process from the closing of the switch to the opening of the overcurrent protection device.

10. A stray inductance value measuring device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: The stray inductance value measuring device is used to be connected to the current detection structure and the voltage detection structure respectively, or the stray inductance value measuring device is used to be connected to the switch, the current detection structure and the voltage detection structure respectively, and the processor implements the steps of the stray inductance value measuring method according to any one of claims 1 to 8 when executing the computer program.

11. A stray inductance measurement system, characterized in that: The device comprises the stray inductance measuring device as claimed in claim 10 and the test circuit.

12. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the stray inductance measurement method according to any one of claims 1 to 8 are implemented.

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