CN117347887B

CN117347887B - Method, system and device for testing self-discharge of battery

Info

Publication number: CN117347887B
Application number: CN202311639065.6A
Authority: CN
Inventors: 冯婷; 张继君; 李志昊; 王少飞
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-12-04
Filing date: 2023-12-04
Publication date: 2024-04-12
Anticipated expiration: 2043-12-04
Also published as: CN117347887A

Abstract

The application discloses a method, a system and a device for testing self-discharge of a battery. By applying the technical scheme of the embodiment of the application, the external resistor with a specific resistance can be selected to be connected in parallel for a certain duration in the process of determining the voltage drop of the battery, and then the self-discharge test of the battery is completed according to the voltage drop result after the parallel connection. Therefore, the effect of accelerating the discharging process of the battery and shortening the obtaining time of the voltage drop of the battery is achieved in a mode of reducing the parallel resistance of the circuit. Thus, the problem of longer self-discharge time of the test battery caused by the fact that a long standing time is needed to be carried out on the battery to measure reliable voltage drop when the capacity of the battery is large or the precision standard of the test instrument is low in the related technology is relieved.

Description

Method, system and device for testing self-discharge of battery

Technical Field

The present application relates to the field of battery technologies, and in particular, to a method, a system, and a device for testing self-discharge of a battery.

Background

Lithium ion power batteries are the primary source of power for contemporary electric devices by virtue of their high energy and high power density.

In the related art, in the process of self-discharging a lithium ion battery, a method for measuring the voltage drop of the battery is mostly adopted by service personnel. However, when the capacity of the battery is large or the accuracy standard of the test instrument is low, it is often necessary to take a long standing time for the battery to measure a reliable voltage drop. This also increases the test duration.

It should be noted that the foregoing statements are merely to provide background information related to the present application and may not necessarily constitute prior art.

Disclosure of Invention

The embodiment of the application provides a method, a system and a device for testing self-discharge of a battery. Thus alleviating the problems that occur in the related art, the self-discharge time of the test battery is longer due to the longer time for determining the voltage drop of the battery.

According to one aspect of the embodiments of the present application, a method for testing self-discharge of a battery is provided, including:

calculating an external resistance value and an external duration based on the electrical parameters of the battery to be tested; performing parallel operation of the external connection duration on the battery to be tested, wherein the parallel operation is used for connecting the battery to be tested and an external resistor with the external connection resistance in parallel; and determining the voltage drop of the battery to be tested obtained through the parallel operation, and calculating the self-discharge result of the battery to be tested based on the voltage drop.

By applying the technical scheme of the embodiment of the application, the external resistor with a specific resistance can be selected to be connected in parallel for a certain duration in the process of determining the voltage drop of the battery, and then the self-discharge test of the battery is completed according to the voltage drop result after the parallel connection. Therefore, the effect of accelerating the discharging process of the battery and shortening the obtaining time of the voltage drop of the battery is achieved in a mode of reducing the parallel resistance of the circuit. Thus, the problem of longer self-discharge time of the test battery caused by the fact that a long standing time is needed to be carried out on the battery to measure reliable voltage drop when the capacity of the battery is large or the precision standard of the test instrument is low in the related technology is relieved.

Optionally, in another embodiment based on the above method of the present application, calculating the external resistance value based on the electrical parameter of the battery to be tested includes: determining an external resistor limit value based on the self-discharge rate limit value of the battery to be tested; and taking the target resistance value smaller than the limit value of the external resistor as the external resistor. By applying the technical scheme of the embodiment of the application, the maximum resistance value of the parallel connection resistor can be determined based on the self-discharge rate limit value of the battery, so that the external resistor smaller than the maximum resistance value is connected with the battery in parallel. Therefore, the defect that the external resistor inhibits the discharge of the battery to be tested due to the fact that the pressure difference between the battery to be tested and the external resistor is large when the external resistance of the external resistor is overlarge is overcome.

Optionally, in another embodiment of the method according to the present application, determining the external resistor limit value based on the self-discharge rate limit value of the battery to be tested includes: calculating a self-discharge current limit value of the battery to be tested based on the self-discharge rate limit value and the battery capacity of the battery to be tested; acquiring a first open-circuit voltage value of the battery to be tested; and calculating the limit value of the external resistor based on the limit value of the self-discharge current and the first open-circuit voltage. By applying the technical scheme of the embodiment of the application, the maximum resistance value of the parallel connection resistor can be further determined based on the self-discharge rate limit value and the battery capacity of the battery, so that the external resistor smaller than the maximum resistance value is connected with the battery in parallel. Therefore, the defect that the external resistor inhibits the discharge of the battery to be tested due to the fact that the pressure difference between the battery to be tested and the external resistor is large when the external resistance of the external resistor is overlarge is overcome.

Optionally, calculating the external connection duration based on the electrical parameter of the battery to be tested includes: calculating a parallel resistance value corresponding to the parallel operation based on the external resistance value and the internal resistance of the battery to be tested; calculating the ratio of the preset voltage variation to the parallel resistance value, and taking the ratio as the sample self-discharge current of the battery to be tested; the preset voltage variation is the lowest voltage variation which can be measured by the voltage measuring module; determining the sample electric quantity variation of the battery to be tested under the condition that the sample voltage variation reaches the preset voltage variation; and calculating the external connection duration based on the sample electric quantity variation and the sample self-discharge current. By applying the technical scheme of the embodiment of the application, the variation degree of the electric quantity capacity which can be achieved by the battery to be tested in the parallel operation period can be calculated and obtained firstly based on the parallel resistance value and the lowest voltage variation of the parallel system, and the most suitable external connection duration for parallel connection of the battery to be tested is determined based on the variation degree, so that the battery to be tested is subjected to the parallel operation based on the external connection duration in the follow-up. Thus, when the external connection time length of the parallel connection is too long, the problem of increasing the self-discharge test time caused by unnecessarily increasing the waiting time length for acquiring the voltage drop of the battery is solved.

Optionally, in another embodiment based on the above method of the present application, determining the amount of change in the electric quantity of the battery to be tested in the case where the amount of change in the sample voltage reaches the preset amount of change in the voltage includes: acquiring a preset numerical association relation for reflecting the electric quantity variation and the voltage variation of the battery to be tested; and inquiring and obtaining the sample electric quantity variation of the battery to be tested from the numerical association relation based on the sample voltage variation. By applying the technical scheme of the embodiment of the application, in the process of determining the most suitable external connection time length for carrying out parallel connection on the battery to be tested, the change degree of the voltage capacity can be determined for the battery to be tested based on the change degree of the electric quantity capacity which can be achieved by the battery during the parallel operation based on the preset numerical association relation, so that the most suitable external connection time length for carrying out parallel connection on the battery to be tested is determined based on the change degree of the voltage capacity. Thus, when the external connection time length of the parallel connection is too long, the problem of increasing the self-discharge test time caused by unnecessarily increasing the waiting time length for acquiring the voltage drop of the battery is solved.

Optionally, in another embodiment based on the method described above, performing the parallel operation of the external connection duration on the battery to be tested includes: acquiring a test instruction for performing self-discharge treatment on a battery to be tested, and determining a preset temperature and humidity environment based on battery materials and current electrical performance indexes of the battery to be tested; and carrying out parallel operation of the external connection duration on the battery to be tested in the preset temperature and humidity environment. By applying the technical scheme of the embodiment of the application, before the batteries are connected in parallel, the temperature and humidity environment which can realize the rapid discharging effect of the batteries is selected based on the electrical performance index of the batteries. So that the subsequent parallel operation of the external connection time length is carried out on the battery to be tested in the temperature and humidity environment. Thereby achieving the effects of further accelerating the discharging process of the battery and further shortening the obtaining time of the voltage drop of the battery.

Optionally, in another embodiment of the method according to the present application, the determining that the parallel operation results in a voltage drop of the battery to be tested includes: acquiring a first open-circuit voltage value of the battery to be tested before the parallel operation; obtaining a second open circuit voltage value of the battery to be tested after the parallel operation; and obtaining the voltage drop of the battery to be tested based on the first open-circuit voltage value and the second open-circuit voltage value. By applying the technical scheme of the embodiment of the application, in the process of determining the voltage drop of the battery, the voltage drop result can be calculated according to the two open-circuit voltage values before and after the parallel connection of the battery, so that the subsequent self-discharge test of the battery is completed based on the voltage drop result. Therefore, the effect of accelerating the discharging process of the battery and shortening the obtaining time of the voltage drop of the battery is achieved in a mode of reducing the parallel resistance of the circuit. Thus, the problem of longer self-discharge time of the test battery caused by the fact that a long standing time is needed to be carried out on the battery to measure reliable voltage drop when the capacity of the battery is large or the precision standard of the test instrument is low in the related technology is relieved.

Optionally, the calculating, based on the voltage drop, a self-discharge result of the battery to be tested includes: and calculating to obtain a self-discharge result of the battery to be tested based on the voltage drop and the external resistance value. By applying the technical scheme of the embodiment of the application, in the process of determining the voltage drop of the battery, the voltage drop result can be calculated according to the two open-circuit voltage values before and after the battery is connected in parallel, so that the subsequent self-discharge test of the battery is completed based on the voltage drop result and the resistance value of the external resistor. Therefore, the effect of accelerating the discharging process of the battery and shortening the obtaining time of the voltage drop of the battery is achieved in a mode of reducing the parallel resistance of the circuit.

According to one aspect of the embodiment of the application, a system for testing self-discharge of a battery is provided, which comprises a voltage measurement module, a parallel resistance module, a battery access device and a processing device; the voltage measurement module is connected with the processing device; the battery access device is used for connecting a battery to be tested, and is used for being connected with the voltage measurement module to form a voltage measurement loop in a first state, and is connected with the parallel resistor module to form a self-discharge loop in a second state.

By applying the technical scheme of the embodiment of the application, the system for automatically connecting the batteries to be tested in parallel can be realized by utilizing the voltage measurement module, the parallel resistance module, the battery access device and the processing device. The effect of accelerating the discharging process of the battery and shortening the obtaining time of the voltage drop of the battery is achieved by reducing the parallel resistance of the circuit. Thus, the problem of longer self-discharge time of the test battery caused by the fact that a long standing time is needed to be carried out on the battery to measure reliable voltage drop when the capacity of the battery is large or the precision standard of the test instrument is low in the related technology is relieved.

Optionally, the parallel resistance module comprises at least one parallel branch; the parallel branch circuit comprises a first external port, a second external port and at least one resistor, wherein one end of a circuit formed by the at least one resistor is connected with the first external port, and the other end of the circuit is connected with the second external port; the first external ports of all the parallel branches are mutually independent, and the second external ports of all the parallel branches are mutually independent; the first external port and the second external port are respectively used for connecting the positive terminal and the negative terminal of the battery access device. By applying the technical scheme of the embodiment of the application, the function of automatically opening and closing the parallel connection of the battery to be tested can be realized by utilizing the parallel branch comprising a plurality of external ports. And the external resistor is connected with the positive and negative terminals of the battery in a mode of mutual control of multiple external ports so as to achieve the effect of reducing the parallel resistor of the circuit.

Optionally, the parallel resistance module comprises at least one parallel branch; the parallel branch circuit comprises a first external port, a second external port and at least one resistor, wherein one end of a circuit formed by the at least one resistor is connected with the first external port, and the other end of the circuit is connected with the second external port; the first external ports of all the parallel branches are mutually independent, and the second external ports of all the parallel branches are mutually independent; the first external port and the second external port are respectively used for connecting the positive terminal and the negative terminal of the battery access device. By applying the technical scheme of the embodiment of the application, the voltage measurement module comprising the scanning element, the measurement element, the first port and the second port can be used for measuring the open-circuit voltage value of the battery before and after parallel connection, and the voltage value is associated with the battery identifier obtained by scanning the scanning element so as to enable the voltage drop result of the battery to be obtained subsequently.

Optionally, the voltage measurement module includes a code scanning element, a measurement element, a first port and a second port; the code scanning element and the measuring element are connected in parallel between the first port and the second port, and the first port and the second port are respectively used for connecting the positive electrode end and the negative electrode end of the battery access device; the code scanning element and the measuring element are both connected with the processing device. Through the application of the technical scheme of the embodiment of the application, the open-circuit voltage value of the battery before and after parallel connection can be measured by using the battery access device comprising the first switch, the second switch, the positive electrode connecting terminal and the negative electrode connecting terminal, and then the effect of reducing the parallel resistance of the circuit by connecting the external resistor with the positive electrode and the negative electrode of the battery in a mode of mutually controlling multiple external ports is achieved.

Optionally, the battery access device includes a first switch, a second switch, a positive connection terminal, and a negative connection terminal; the positive electrode connecting terminal and the negative electrode connecting terminal are respectively used for connecting the positive electrode and the negative electrode of the battery to be tested; one end of the first switch is connected with the positive electrode connecting terminal, and the other end of the first switch is used for switching connection between the positive electrode end of the voltage measuring module or the positive electrode end of the parallel resistor module; one end of the second switch is connected with the negative electrode connecting terminal, and the other end of the second switch is used for switching connection between the negative electrode end of the voltage measuring module or the negative electrode end of the parallel resistor module. Through the application of the technical scheme of the embodiment of the application, the open-circuit voltage value of the battery before and after parallel connection can be measured by using the battery access device comprising the first switch, the second switch, the positive electrode connecting terminal and the negative electrode connecting terminal, and then the effect of reducing the parallel resistance of the circuit by connecting the external resistor with the positive electrode and the negative electrode of the battery in a mode of mutually controlling multiple external ports is achieved.

Optionally, the system further comprises a transport mechanism; the battery access device is arranged on the conveying mechanism, and the conveying mechanism is connected with the processing device; the processing device is used for controlling the conveying mechanism to drive the battery access device to move towards the voltage measurement module in the first state, and controlling the conveying mechanism to drive the battery access device to move towards the parallel resistor module in the second state. Through the application of the technical scheme of the embodiment of the application, the connection and separation functions of the measuring battery and the external resistor can be realized by utilizing the transmission mechanism. Therefore, the self-discharge system which can automatically connect the batteries to be tested in parallel when the starting instruction is detected and further reduce the parallel resistance of the circuit is realized.

Optionally, the conveying mechanism comprises a bracket and a conveyor belt; the bracket is arranged between the voltage measurement module and the parallel resistor module; the battery access device is in sliding connection with the bracket, and the conveyor belt is fixedly connected with the battery access device; the processing device is used for controlling the conveyor belt to drive the battery access device to move on the support. By applying the technical scheme of the embodiment of the application, the automatic connection and automatic separation functions of the measuring battery and the external resistor can be realized by using a conveying mechanism comprising the bracket and the conveying belt. Therefore, the self-discharge system which can automatically connect the batteries to be tested in parallel when the starting instruction is detected and further reduce the parallel resistance of the circuit is realized.

According to still another aspect of the embodiments of the present application, there is provided an apparatus for testing self-discharge of a battery, including:

the calculating module is configured to calculate an external resistance value and an external duration based on the electrical parameters of the battery to be tested;

the processing module is configured to perform parallel operation of the external connection duration on the battery to be tested, wherein the parallel operation is used for connecting the battery to be tested and an external resistor with the external connection resistance in parallel;

And the determining module is configured to determine the voltage drop of the battery to be tested obtained through the parallel operation and calculate the self-discharge result of the battery to be tested based on the voltage drop.

According to still another aspect of the embodiments of the present application, there is provided an electronic device including:

a memory for storing executable instructions; and

and a processor for executing the executable instructions with the memory to perform operations of any of the methods described above.

According to yet another aspect of the embodiments of the present application, there is provided a computer-readable storage medium storing computer-readable instructions that, when executed, perform the operations of any of the methods described above.

The foregoing description is merely an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other effects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

The present application will be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

FIG. 1 is a schematic diagram of a method for testing self-discharge of a battery according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a method for testing self-discharge of a battery according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a system architecture for testing battery self-discharge according to an embodiment of the present application;

FIG. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure;

fig. 6 shows a schematic diagram of a storage medium according to an embodiment of the present application.

Detailed Description

Embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical solutions of the present application, and thus are only examples, and are not intended to limit the scope of protection of the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the figures above are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first," "second," etc. are used merely to distinguish between different objects and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated, a particular order or a primary or secondary relationship. In the description of the embodiments of the present application, the meaning of "plurality" is two or more unless explicitly defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is merely an association relationship describing an association object, which means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

A method for performing a test battery self-discharge according to an exemplary embodiment of the present application is described below with reference to fig. 1 to 3. It should be noted that the following application scenario is only shown for the convenience of understanding the spirit and principles of the embodiments of the present application, and the embodiments of the present application are not limited in any way in this respect. Rather, embodiments of the present application may be applied to any scenario where applicable.

The electronic device disclosed in the embodiments of the present application may be one or more computing devices, or may be one server or a server cluster formed by a plurality of servers.

In the related art, a power battery is a core component of an electric device such as an electric automobile. As an example, the power battery may be a lithium battery. The lithium battery is used as an efficient and convenient energy storage mode, and is deep in all corners of our lives.

In one approach, in mobile/non-mobile electronic devices, such as cell phones, tablet computers, notebook computers, digital cameras, etc., the lithium battery is kept away from the mobile, permanent power supply for these devices.

Further, lithium batteries also play an important role in the field of electric automobiles. Nowadays, more and more electric automobiles adopt lithium batteries as power sources, and the electric automobiles have the advantages of higher energy density and environmental protection, so that the electric automobiles have longer endurance mileage and lower emission.

In one approach, testing of power cells involves various types. Including, for example, external short circuit testing, thermal shock testing, pinch testing, overshoot testing, self-discharge testing, and the like.

Among them, for the self-discharge test of the battery, it is generally known to measure parameters such as voltage, current, capacity, internal resistance, temperature, etc. of the battery during the discharge process by using a certain instrument and procedure, so as to evaluate the performance and life of the battery.

In one mode, there are various methods for performing self-discharge test on the battery, and in this embodiment of the present application, an appropriate method may be selected according to factors such as different types, specifications, application environments, and service lives of the battery to be tested.

As an example, the self-discharge test of the battery in the embodiments of the present application may be a discharge test of the battery in a normal use scenario, a discharge test of the battery in a limit scenario, or a discharge test of the battery in a destructive scenario.

As an example, the self-discharge test of the embodiment of the present application under normal use scenarios is: the discharging process of the battery under normal use conditions is simulated, for example, the battery is used in a mobile phone, a computer, an electric vehicle and other equipment, and the discharging time, the voltage change, the temperature change and other data of the battery are recorded so as to evaluate the self-discharging result of the battery.

As an example, the self-discharge test in the extreme scenario of the embodiment of the present application is: the battery is subjected to discharge tests under some extreme conditions, such as high temperature, low temperature, high voltage, high rate, overdischarge, etc., to evaluate the self-discharge result of the battery.

As another example, the self-discharge test of the application embodiments in a destructive scenario is: the battery is subjected to some destructive operations such as needling, burning, high-altitude dropping, collision, etc., to observe the reaction and damage degree of the battery, thereby evaluating the self-discharge result of the battery.

As another example, the self-discharge test of the application embodiment in an electrochemical scenario is: some electrochemical tests, such as cyclic voltammetry, electrochemical impedance, charge-discharge, differential voltage/capacitance, rate, cycling, etc., are performed on the battery using some specialized electrochemical instrumentation, such as battery test systems, electrochemical workstations, etc., to analyze the electrochemical reaction processes and parameters of the battery to evaluate the capacity, internal resistance, power, cycle life, electrochemical stability, etc., of the battery to evaluate the self-discharge results of the battery.

In the related art, there is a problem in the process of performing self-discharge test on a battery in the prior art, that is, a method for detecting voltage drop is mostly adopted for identifying self-discharge abnormal cells of a lithium ion battery, but when the capacity of the battery is large or the accuracy of a test instrument is limited, a long standing time is often required to detect reliable voltage drop. So that the self-discharge result of the battery can be obtained.

Therefore, in order to solve the above-mentioned problems, the related art only has a long time for determining the voltage drop of the battery, which results in a long self-discharge time of the test battery. The embodiment of the application provides a method for testing self-discharge of a battery. In the process of determining the voltage drop of the battery, the battery is connected with an external resistor with a specific resistance value in parallel for a certain duration, and then the self-discharge test of the battery is completed according to the voltage drop result after the parallel connection.

In one mode, the embodiment of the application also provides a method, a system and a device for testing self-discharge of a battery.

Fig. 1 schematically shows a flow diagram of a method of testing self-discharge of a battery according to an embodiment of the present application. As shown in fig. 1, the method includes:

s101, calculating an external resistance value and an external duration based on the electrical parameters of the battery to be tested.

S102, carrying out external connection operation on the battery to be tested for a long time, wherein the parallel connection operation is used for connecting the battery to be tested with an external resistor with an external resistance value in parallel.

S103, determining parallel operation to obtain voltage drop of the battery to be tested, and calculating to obtain self-discharge result of the battery to be tested based on the voltage drop.

In the related art, in the actual testing of the battery, it is generally selected to identify the voltage drop of the battery to be tested, so as to obtain the self-discharge result.

In one mode, the embodiment of the application can select an external resistor with a proper resistance value and a proper external duration for the battery to be tested based on the current electrical parameters of the battery to be tested in advance. So that the effect of accelerating the voltage drop of the battery is achieved by connecting the two in parallel for a certain period of time. It will be appreciated that this also reduces the accuracy limitations of the voltage testing apparatus, thereby enabling rapid identification of self-discharge.

In one manner, the electrical parameter of the battery to be tested may be a self-discharge rate limit of the battery, a battery capacity, a battery resistance, and the like.

In one mode, the embodiment of the application can calculate the self-discharge result of the battery to be tested through the following steps:

and a, acquiring the electrical parameters of the battery to be tested.

The electrical parameters may include, among others, the self-discharge rate limit value of the battery to be tested, the battery capacity, the battery resistance, etc.

And b, standing the battery to be tested for a period of time to remove the voltage polarization phenomenon generated in the last charge and discharge process.

As an example, the rest period of the battery to be tested may be determined by the cell system, the battery material, and the current level of the battery to be tested.

For example, when it is detected that the positive electrode material of the battery to be tested uses a lithium iron phosphate material, the battery material of the battery to be tested is determined to be "lithium iron phosphate material", and then it is subjected to a standing period for a long time.

For another example, when it is detected that the positive electrode material of the battery to be tested uses a ternary lithium material, the battery material of the battery to be tested is determined to be a "ternary lithium material" and is subjected to a standing period of a relatively short time.

And c, measuring a first open-circuit voltage value of the battery to be tested by using a voltage measuring module.

As an example, the first open circuit voltage value of the battery to be tested is the voltage value thereof before the parallel operation is performed, and is denoted as OCV1.

And d, connecting the battery to be tested with the external resistor with the external resistance in parallel, wherein the duration reaches the external duration.

And e, after the external connection time, separating the battery to be tested from the external connection resistor, and measuring a second open-circuit voltage value of the battery to be tested by using a voltage measuring module.

And f, obtaining the voltage drop of the battery to be tested based on the first open-circuit voltage value and the second open-circuit voltage value.

And g, calculating to obtain a self-discharge result of the battery to be tested based on the voltage drop and the external resistance value.

As an example, the battery discharge rate calculation process of the battery to be tested is:

firstly, calculating a difference value between a first open-circuit voltage value and a second open-circuit voltage value, and obtaining the self-discharge rate of the battery based on the difference value and an external resistance value of an external resistor.

In summary, in the technical scheme of the embodiment of the application, in the process of determining the voltage drop of the battery, the battery is selected to be connected in parallel with an external resistor with a specific resistance for a certain duration, and then the self-discharge test of the battery is completed according to the voltage drop result after the parallel connection. Therefore, the effect of accelerating the discharging process of the battery and shortening the obtaining time of the voltage drop of the battery is achieved in a mode of reducing the parallel resistance of the circuit.

The foregoing description of various embodiments is intended to highlight differences between the various embodiments, which may be the same or similar to each other by reference, and is not repeated herein for the sake of brevity.

Optionally, in another embodiment based on the above method of the present application, calculating the external resistance value based on the electrical parameter of the battery to be tested includes: determining an external resistor limit value based on a self-discharge rate limit value of the battery to be tested; and taking the target resistance value smaller than the limit value of the external resistor as the external resistor.

In one mode, the embodiment of the application can calculate the external resistor limit value corresponding to the external resistor according to the self-discharge rate limit value defined for the battery to be tested in advance.

In one mode, the self-discharge rate limit value of the battery to be tested is a preset value of the battery to be tested. As an example, the self-discharge rate limit value may be a month self-discharge rate limit value having a value of 2%. I.e. the self-discharge frequency of the battery should not exceed 2% within one month.

In another mode, the limit value of the external resistor is the upper limit value of the external resistor. It can be understood that when the resistance value of the external resistor is too high, the self-discharge rate requirement of the battery to be tested cannot be met.

It can be understood that after determining the limit value of the external resistor corresponding to the external resistor, a certain resistance value (but greater than 0) smaller than the limit value of the external resistor can be used as the external resistance value of the external resistor.

As an example, when the limit value of the external resistor corresponding to the external resistor is 10 ohms, the external resistance value of the external resistor may be 3 ohms, 5 ohms, or the like.

By applying the technical scheme of the embodiment of the application, the maximum resistance value of the parallel connection resistor can be determined based on the self-discharge rate limit value of the battery, so that the external resistor smaller than the maximum resistance value is connected with the battery in parallel. Therefore, the defect that the external resistor inhibits the discharge of the battery to be tested due to the fact that the pressure difference between the battery to be tested and the external resistor is large when the external resistance of the external resistor is overlarge is overcome.

Optionally, in another embodiment based on the method described above, determining the external resistance limit value based on the self-discharge rate limit value of the battery to be tested includes: calculating to obtain a self-discharge current limit value of the battery to be tested based on the self-discharge rate limit value and the battery capacity of the battery to be tested; acquiring a first open-circuit voltage value of a battery to be tested; and calculating an external resistor limit value based on the self-discharge current limit value and the first open circuit voltage value.

In one mode, in the process of calculating the limit value of the external resistor, the embodiment of the application may implement the following steps:

as an example, consider for example a battery to be tested defining a monthly self-discharge rate limit of k1 (calculated 30 days per month), a battery cell capacity of Q, a first open circuit voltage value of OCV 1:

the self-discharge current limit value of the battery to be tested is then:

I_max= k1*Q/30/24。

it will be appreciated that 30 is the number of days of a month and 24 is the number of hours of a day.

As another example, the external resistor limit value R of the external resistor is calculated by:

R=OCV1/I_max。

as another example, the external resistance of the external resistor is denoted as R ', where R' >0.

As an example, the external resistance R' of the external resistor may be greater than 1/3R. It can be understood that when the external resistance is too small, the voltage drop signal of the external resistor can mask the voltage drop signal generated by self-discharging of the battery to be tested.

By applying the technical scheme of the embodiment of the application, the maximum resistance value of the parallel connection resistor can be further determined based on the self-discharge rate limit value and the battery capacity of the battery, so that the external resistor smaller than the maximum resistance value is connected with the battery in parallel. Therefore, the defect that the external resistor inhibits the discharge of the battery to be tested due to the fact that the pressure difference between the battery to be tested and the external resistor is large when the external resistance of the external resistor is overlarge is overcome.

Optionally, calculating the external connection duration based on the electrical parameter of the battery to be tested includes: calculating a parallel resistance value corresponding to parallel operation based on the external resistance value and the internal resistance of the battery to be tested; calculating the ratio of the preset voltage variation to the parallel resistance value, and taking the ratio as the sample self-discharge current of the battery to be tested; the preset voltage variation is the lowest voltage variation which can be measured by the voltage measuring module; determining the sample electric quantity variation of the battery to be tested under the condition that the sample voltage variation reaches the preset voltage variation; and calculating to obtain the external connection time length based on the sample electric quantity variation and the sample self-discharge current.

As an example, the embodiment of the application uses a capacity of 300Ah of the battery to be tested, and a self-discharge rate limit value of not higher than 3%. And the minimum voltage variation DeltaV is more than or equal to 10mV (namely, the voltage measurement module is required to be reliable under the condition that DeltaV is more than or equal to 10 mV). The first open-circuit voltage value is OCV1, the internal resistance of the battery to be tested is r_leak, and the external resistance value of the external resistor is R' for illustration:

in the first aspect, the embodiment of the present application needs to calculate the parallel resistance value R1 corresponding to the parallel operation:

R1=1/2*（R_leak+R’）

wherein R' is the external resistance value of the external resistor, and R_leak is the internal resistance of the battery to be tested.

In a second aspect, embodiments of the present application first require calculating a sample self-discharge current i_leak of a battery to be tested:

I_leak=△V/R1。

wherein DeltaV is the minimum voltage variation, and R1 is the parallel resistance.

In a third aspect, embodiments of the present application require calculating a sample power variation Δq of a battery to be tested:

△Q=1*△V。

as an example, the embodiment of the present application may obtain a preset value for reflecting a numerical association relationship between an electric quantity variation and a voltage variation of a battery to be tested; and inquiring and obtaining the sample electric quantity variation of the battery to be tested from the numerical association relation based on the sample voltage variation.

In a fourth aspect, according to the calculation result, the embodiment of the present application may calculate the external connection duration t of the external connection resistor:

t=△Q/I_leak。

by applying the technical scheme of the embodiment of the application, the variation degree of the electric quantity capacity which can be achieved by the battery to be tested in the parallel operation period can be calculated and obtained firstly based on the parallel resistance value and the lowest voltage variation of the parallel system, and the most suitable external connection duration for parallel connection of the battery to be tested is determined based on the variation degree, so that the battery to be tested is subjected to the parallel operation based on the external connection duration in the follow-up. Thus, when the external connection time length of the parallel connection is too long, the problem of increasing the self-discharge test time caused by unnecessarily increasing the waiting time length for acquiring the voltage drop of the battery is solved.

Optionally, in another embodiment of the method according to the present application, determining the amount of change in the electric quantity of the battery to be tested in the case of a preset amount of change in the voltage includes: acquiring a preset numerical association relation for reflecting the electric quantity variation and the voltage variation of the battery to be tested; and inquiring and obtaining the sample electric quantity variation of the battery to be tested from the numerical association relation based on the sample voltage variation.

By applying the technical scheme of the embodiment of the application, in the process of determining the most suitable external connection time length for carrying out parallel connection on the battery to be tested, the change degree of the voltage capacity can be determined for the battery to be tested based on the change degree of the electric quantity capacity which can be achieved by the battery during the parallel operation based on the preset numerical association relation, so that the most suitable external connection time length for carrying out parallel connection on the battery to be tested is determined based on the change degree of the voltage capacity. Thus, when the external connection time length of the parallel connection is too long, the problem of increasing the self-discharge test time caused by unnecessarily increasing the waiting time length for acquiring the voltage drop of the battery is solved.

Optionally, in another embodiment based on the method described above, performing the parallel operation of the external connection duration of the battery to be tested includes: acquiring a test instruction for performing self-discharge treatment on a battery to be tested, and determining a preset temperature and humidity environment based on battery materials and current electrical performance indexes of the battery to be tested; and carrying out external-connection long-duration parallel operation on the battery to be tested in a preset temperature and humidity environment.

In one mode, the embodiment of the application can select the temperature and humidity environment which can accelerate the self-discharge speed of the battery to be tested in different electrical performance states.

For example, for a battery of "lithium iron phosphate material" and a basic electrical property interval is interval a, and its fastest discharge temperature environment is 78 ℃ -82 ℃ ". Therefore, the embodiment of the application can select the temperature environment to perform the parallel operation of the external connection time length on the battery to be tested.

For another example, for a battery of "ternary lithium material" and a basic electrical property interval is interval B, the fastest discharge temperature environment is 60 ℃ -62 ℃ ". Therefore, the embodiment of the application can select the temperature environment to perform the parallel operation of the external connection time length on the battery to be tested.

By applying the technical scheme of the embodiment of the application, before the batteries are connected in parallel, the temperature and humidity environment which can realize the rapid discharging effect of the batteries is selected based on the electrical performance index of the batteries. So that the subsequent parallel operation of the external connection time length is carried out on the battery to be tested in the temperature and humidity environment. Thereby achieving the effects of further accelerating the discharging process of the battery and further shortening the obtaining time of the voltage drop of the battery.

Optionally, in another embodiment based on the above method of the present application, determining that the parallel operation results in a voltage drop of the battery to be tested includes: acquiring a first open-circuit voltage value of a battery to be tested before parallel operation; obtaining a second open circuit voltage value of the battery to be tested after parallel operation; and obtaining the voltage drop of the battery to be tested based on the first open-circuit voltage value and the second open-circuit voltage value.

In one mode, the calculation process of the voltage drop of the battery to be tested in the embodiment of the application is as follows:

△OCV=(OCV1-OCV2)。

wherein OCV1 is a first open circuit voltage value and OCV2 is a second open circuit voltage value.

By applying the technical scheme of the embodiment of the application, in the process of determining the voltage drop of the battery, the voltage drop result can be calculated according to the two open-circuit voltage values before and after the parallel connection of the battery, so that the subsequent self-discharge test of the battery is completed based on the voltage drop result. Therefore, the effect of accelerating the discharging process of the battery and shortening the obtaining time of the voltage drop of the battery is achieved in a mode of reducing the parallel resistance of the circuit. Thus, the problem of longer self-discharge time of the test battery caused by the fact that a long standing time is needed to be carried out on the battery to measure reliable voltage drop when the capacity of the battery is large or the precision standard of the test instrument is low in the related technology is relieved.

Optionally, based on the voltage drop, calculating to obtain a self-discharge result of the battery to be tested, including: and calculating to obtain the self-discharge result of the battery to be tested based on the voltage drop and the external resistance.

In one mode, the process of calculating the discharge rate of the battery to be tested in the embodiment of the application is as follows:

I=(OCV1-OCV2)/R1；

Wherein R1 is the corresponding parallel resistance value after the battery to be tested and the external resistor are in parallel connection.

In another way, the calculation process of the self-discharge rate of the battery to be tested in the embodiment of the present application is:

I_leak=I-(OCV1-OCV2)/R’；

wherein R' is the external resistance of the external resistor.

As an example, a method for testing self-discharge of a battery according to an embodiment of the present application is specifically described with reference to fig. 2:

and step 1a, determining an external resistor limit value based on the self-discharge rate limit value of the battery to be tested.

It should be noted that, in the embodiment of the present application, the step 1a and the step 1b may be performed simultaneously or not sequentially.

In one mode, in the process of determining the limit value of the external resistor, the embodiment of the application can calculate the limit value of the self-discharge current of the battery to be tested based on the limit value of the self-discharge rate of the battery to be tested and the battery capacity; and obtaining a first open-circuit voltage value of the battery to be tested, so that an external resistor limit value is calculated based on the self-discharge current limit value and the first open-circuit voltage value.

And 2a, taking the target resistance value smaller than the limit value of the external resistor as the external resistor. And then step 4 is entered.

As an example, the target resistance value may be one third of the external resistance limit value.

And step 1b, calculating a parallel resistance value corresponding to parallel operation based on the external resistance value and the internal resistance of the battery to be tested.

In one mode, the parallel resistance is a circuit resistance obtained by connecting the external resistance and the battery to be tested in parallel.

Step 2b, calculating the ratio of the preset voltage variation to the parallel resistance value, and taking the ratio as the sample self-discharge current of the battery to be tested; the preset voltage variation is the lowest voltage variation which can be measured by the voltage measuring module.

And 3b, determining the sample electric quantity variation of the battery to be tested under the condition that the voltage variation is preset, and calculating the external connection duration based on the sample electric quantity variation and the sample self-discharge current. And then step 4 is entered.

And 4, determining a preset temperature and humidity environment based on battery materials and current electrical performance indexes of the battery to be tested.

And 5, carrying out external-connection long-duration parallel operation on the battery to be tested in a preset temperature and humidity environment.

The parallel operation is used for connecting the battery to be tested with an external resistor with an external resistance value in parallel.

Step 6, obtaining a first open-circuit voltage value of the battery to be tested before parallel operation; and obtaining a second open circuit voltage value of the battery to be tested after parallel operation.

And 7, obtaining the voltage drop of the battery to be tested based on the first open-circuit voltage value and the second open-circuit voltage value.

And 8, calculating to obtain a self-discharge result of the battery to be tested based on the voltage drop and the external resistance value.

By applying the technical scheme of the embodiment of the application, in the process of determining the voltage drop of the battery, the voltage drop result can be calculated according to the two open-circuit voltage values before and after the battery is connected in parallel, so that the subsequent self-discharge test of the battery is completed based on the voltage drop result and the resistance value of the external resistor. Therefore, the effect of accelerating the discharging process of the battery and shortening the obtaining time of the voltage drop of the battery is achieved in a mode of reducing the parallel resistance of the circuit.

Fig. 3 schematically shows an architecture diagram of a system for testing battery self-discharge according to an embodiment of the present application. As shown in fig. 3, the system includes a voltage measurement module, a parallel resistance module, a battery access device, and a processing device, wherein:

the voltage measuring module is connected with the processing device;

the battery access device is used for connecting a battery to be tested, and is used for being connected with the voltage measurement module to form a voltage measurement loop in a first state and being connected with the parallel resistor module to form a self-discharge loop in a second state.

In one mode, the voltage measurement module in the system for testing the self-discharge of the battery in the embodiment of the application can be used for measuring two open-circuit voltage values (namely, a first open-circuit voltage value and a second open-circuit voltage value) of the battery to be tested before and after parallel connection, and calculating a voltage drop result according to the two open-circuit voltage values, so that the subsequent self-discharge test of the battery is completed based on the voltage drop result.

In another way, the parallel resistor module in the embodiment of the application can be used for performing parallel operation with a battery to be tested for a certain external connection time period.

As an example, the embodiment of the present application does not limit the number of parallel resistor modules, and for example, one resistor module may be used, or a plurality of resistor modules may be used.

As another example, a parallel resistor module in an embodiment of the present application may include one or more external resistors of fixed resistance value. One or more external resistors with variable resistance characteristics may also be included.

In another manner, the battery access device in the embodiments of the present application may be used to perform a connection operation with a battery to be tested.

In one manner, the processing device in the embodiments of the present application may be configured to store two open circuit voltage values (i.e., a first open circuit voltage value and a second open circuit voltage value) of the battery to be tested before and after the parallel connection. And calculating a voltage drop result and a self-discharge result based on the first open-circuit voltage value and the second open-circuit voltage value.

In an alternative, the parallel resistance module includes at least one parallel branch; the parallel branch circuit comprises a first external port, a second external port and at least one resistor, wherein one end of a circuit formed by the at least one resistor is connected with the first external port, and the other end of the circuit is connected with the second external port; the first external ports of the parallel branches are mutually independent, and the second external ports of the parallel branches are mutually independent; the first external port and the second external port are respectively used for connecting the positive terminal and the negative terminal of the battery access device.

In one manner, the number of parallel branches in embodiments of the present application may be one or more.

As an example, in the case of a plurality of parallel branches, the resistance value of the resistance of each branch may be the same or different. For example, if the resistance values of the branches are different, the processor may select, based on the calculated resistance limit value of the external resistor, a resistor capable of reaching less than the resistance limit value from the plurality of branches as the external resistor, so that the battery to be tested is connected with the selected branch in a manner of controlling the transmission mechanism.

As another example, in the case of one parallel branch, the resistance value of the resistance of the branch may have a variable resistance characteristic. The processor can convert the resistance of the branch circuit into a resistance which can reach less than the resistance limit value based on the calculated resistance limit value of the external resistor, and the resistance can be used as the external resistor, so that the battery to be tested is connected with the selected branch circuit.

In one mode, each parallel branch is connected with the battery access device through two external ports (namely a first external port and a second external port).

In one mode, the positive and negative electrode segments of the battery access device of the embodiments of the present application are interconnected with the first and second ports. So as to realize the connection of the parallel resistor module and the battery access device.

By applying the technical scheme of the embodiment of the application, the function of automatically opening and closing the parallel connection of the battery to be tested can be realized by utilizing the parallel branch comprising a plurality of external ports. And the external resistor is connected with the positive and negative terminals of the battery in a mode of mutual control of multiple external ports so as to achieve the effect of reducing the parallel resistor of the circuit.

Optionally, the voltage measurement module includes a code scanning element, a measurement element, a first port and a second port; the code scanning element and the measuring element are connected in parallel between a first port and a second port, and the first port and the second port are respectively used for connecting the positive electrode end and the negative electrode end of the battery access device; the code scanning element and the measuring element are both connected with the processing device.

In one mode, the measuring element in the embodiment of the application may be a voltmeter, and the code scanning element may be used for scanning a battery number of the battery to be tested.

It can be understood that the code scanning element and the measuring element in the embodiments of the present application may be connected to the battery access device through the first port and the second port.

By applying the technical scheme of the embodiment of the application, the voltage measurement module comprising the scanning element, the measurement element, the first port and the second port can be used for measuring the open-circuit voltage value of the battery before and after parallel connection, and the voltage value is associated with the battery identifier obtained by scanning the scanning element so as to enable the voltage drop result of the battery to be obtained subsequently.

Optionally, the battery access device includes a first switch, a second switch, a positive connection terminal, and a negative connection terminal; the positive electrode connecting terminal and the negative electrode connecting terminal are respectively used for connecting the positive electrode and the negative electrode of the battery to be tested; one end of the first switch is connected with the positive electrode connecting terminal, and the other end of the first switch is used for switching connection between the positive electrode end of the voltage measuring module or the positive electrode end of the parallel resistor module; one end of the second switch is connected with the negative electrode connecting terminal, and the other end of the second switch is used for switching connection between the negative electrode end of the voltage measuring module or the negative electrode end of the parallel resistor module.

In one manner, the positive and negative terminals of the voltage measurement module of the embodiments of the present application are interconnected with the first and second ports. So as to realize the connection of the voltage measurement module and the battery access device.

Through the application of the technical scheme of the embodiment of the application, the open-circuit voltage value of the battery before and after parallel connection can be measured by using the battery access device comprising the first switch, the second switch, the positive electrode connecting terminal and the negative electrode connecting terminal, and then the effect of reducing the parallel resistance of the circuit by connecting the external resistor with the positive electrode and the negative electrode of the battery in a mode of mutually controlling multiple external ports is achieved.

Optionally, the system further comprises a transport mechanism; the battery access device is arranged on the conveying mechanism, and the conveying mechanism is connected with the processing device; the processing device is used for controlling the transmission mechanism to drive the battery access device to move towards the voltage measurement module in the first state, and controlling the transmission mechanism to drive the battery access device to move towards the parallel resistor module in the second state.

Through the application of the technical scheme of the embodiment of the application, the connection and separation functions of the measuring battery and the external resistor can be realized by utilizing the transmission mechanism. Therefore, the self-discharge system which can automatically connect the batteries to be tested in parallel when the starting instruction is detected and further reduce the parallel resistance of the circuit is realized.

Optionally, the conveying mechanism comprises a bracket and a conveyor belt; the bracket is arranged between the voltage measurement module and the parallel resistor module; the battery access device is in sliding connection with the bracket, and the conveyor belt is fixedly connected with the battery access device; the processing device is used for controlling the conveyor belt to drive the battery access device to move on the support.

By applying the technical scheme of the embodiment of the application, the automatic connection and automatic separation functions of the measuring battery and the external resistor can be realized by using a conveying mechanism comprising the bracket and the conveying belt. Therefore, the self-discharge system which can automatically connect the batteries to be tested in parallel when the starting instruction is detected and further reduce the parallel resistance of the circuit is realized.

As an example, the specific explanation is given to the steps performed by a system for testing self-discharge of a battery according to the embodiment of the present application:

step a, a battery to be tested is accessed into a test system, a first switch is accessed into a first port, a second switch Guan Jieru is accessed into a second port, a code scanning element scans codes of the battery, the serial numbers of the battery are recorded, and the serial numbers are input into a processor;

step b, measuring a first open-circuit voltage value OCV1 of the battery to be tested by using a voltmeter, inputting the first open-circuit voltage value OCV1 into a processor, performing one-to-one correspondence with the serial numbers of the battery cells, and switching off a first switch and a second switch;

step c, a first switch is connected to a first external port, a second switch is connected to a second external port, and a resistor R' is connected in parallel to the anode and the cathode of the battery to be tested;

d, after the batteries are connected in parallel, putting the batteries into a warehouse for storage, and after the external connection time t is stored, switching off the first switch and the second switch;

Step e, a first switch is connected to a first port, a second switch Guan Jieru is connected to a second port, a code scanning element scans codes of the battery, the serial numbers of the battery are recorded, and the serial numbers are input into a processor;

step f, measuring a second open-circuit voltage value OCV2 of the battery to be tested by using a voltmeter, inputting the second open-circuit voltage value OCV2 into a processor, performing one-to-one correspondence with the serial numbers of the battery cells, and switching off the first switch and the second switch;

step g, the processor calculates and outputs a self-discharge current value of the battery according to the four parameters of the measured OCV1, OCV2, t and R';

and h, the processor compares the measured self-discharge current value with a preset self-discharge threshold value, controls the battery to be tested meeting the quality requirement to flow into the next process, and otherwise, flows into a bad product bin.

Optionally, in another embodiment of the present application, as shown in fig. 4, the present application further provides an apparatus for testing self-discharge of a battery. The method comprises the following steps:

a calculation module 201 configured to calculate an external resistance value and an external duration based on an electrical parameter of the battery to be tested;

a processing module 202 configured to perform a parallel operation of the external connection duration on the battery to be tested, where the parallel operation is used to connect the battery to be tested and an external resistor of the external connection resistance in parallel;

a determining module 203 is configured to determine that the parallel operation results in a voltage drop of the battery to be tested, and calculate, based on the voltage drop, a self-discharge result of the battery to be tested.

In another embodiment of the present application, the processing module 202 is configured to:

determining an external resistor limit value based on the self-discharge rate limit value of the battery to be tested;

and taking the target resistance value smaller than the limit value of the external resistor as the external resistor.

calculating a self-discharge current limit value of the battery to be tested based on the self-discharge rate limit value and the battery capacity of the battery to be tested; acquiring a first open-circuit voltage value of the battery to be tested;

and calculating the limit value of the external resistor based on the limit value of the self-discharge current and the first open-circuit voltage.

calculating a parallel resistance value corresponding to the parallel operation based on the external resistance value and the internal resistance of the battery to be tested;

calculating the ratio of the preset voltage variation to the parallel resistance value, and taking the ratio as the sample self-discharge current of the battery to be tested; the preset voltage variation is the lowest voltage variation which can be measured by the voltage measuring module;

Determining the sample electric quantity variation of the battery to be tested under the condition that the sample voltage variation reaches the preset voltage variation;

and calculating the external connection duration based on the sample electric quantity variation and the sample self-discharge current.

acquiring a preset numerical association relation for reflecting the electric quantity variation and the voltage variation of the battery to be tested;

and inquiring and obtaining the sample electric quantity variation of the battery to be tested from the numerical association relation based on the sample voltage variation.

acquiring a test instruction for performing self-discharge treatment on a battery to be tested, and determining a preset temperature and humidity environment based on battery materials and current electrical performance indexes of the battery to be tested;

and carrying out parallel operation of the external connection duration on the battery to be tested in the preset temperature and humidity environment.

acquiring a first open-circuit voltage value of the battery to be tested before the parallel operation; obtaining a second open circuit voltage value of the battery to be tested after the parallel operation;

And obtaining the voltage drop of the battery to be tested based on the first open-circuit voltage value and the second open-circuit voltage value.

and calculating to obtain a self-discharge result of the battery to be tested based on the voltage drop and the external resistance value.

The embodiment of the application also provides electronic equipment for executing the method for testing the self-discharge of the battery. Referring to fig. 5, a schematic diagram of an electronic device according to some embodiments of the present application is shown. As shown in fig. 5, the electronic apparatus 3 includes: a processor 300, a memory 301, a bus 302 and a communication interface 303, the processor 300, the communication interface 303 and the memory 301 being connected by the bus 302; the memory 301 stores a computer program that can be executed on the processor 300, and the processor 300 executes the method for testing the self-discharge of the battery according to any of the foregoing embodiments of the present application when executing the computer program.

The memory 301 may include a high-speed random access memory (RAM: random Access Memory), and may further include a non-volatile memory (non-volatile memory), such as at least one magnetic disk memory. The communication connection between the device network element and at least one other network element is achieved through at least one communication interface 303 (which may be wired or wireless), the internet, a wide area network, a local network, a metropolitan area network, etc. may be used.

Bus 302 may be an ISA bus, a PCI bus, an EISA bus, or the like. The buses may be classified as address buses, data buses, control buses, etc. The memory 301 is configured to store a program, and the processor 300 executes the program after receiving an execution instruction, and the method for testing self-discharge of a battery disclosed in any of the foregoing embodiments of the present application may be applied to the processor 300 or implemented by the processor 300.

The processor 300 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 300 or by instructions in the form of software. The processor 300 may be a general-purpose processor, including a processor (Central Processing Unit, CPU for short), a network processor (Network Processor, NP for short), etc.; but may also be a Digital Signal Processor (DSP), application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed.

A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 301, and the processor 300 reads the information in the memory 301, and in combination with its hardware, performs the steps of the above method.

The electronic device provided by the embodiment of the application and the method for testing the self-discharge of the battery provided by the embodiment of the application are the same in the invention conception, and have the same beneficial effects as the method adopted, operated or realized by the electronic device.

The present application further provides a computer readable storage medium corresponding to the method for testing battery self-discharge provided in the foregoing embodiments, referring to fig. 6, the computer readable storage medium is shown as a program product 40, on which a computer program (i.e. a program product) is stored, where the computer program, when executed by a processor, performs the method for testing battery self-discharge provided in any of the foregoing embodiments.

It should be noted that examples of the computer readable storage medium may also include, but are not limited to, a phase change memory (PRAM), a Static Random Access Memory (SRAM), a Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a flash memory, or other optical or magnetic storage medium, which will not be described in detail herein.

The computer readable storage medium provided by the above embodiments of the present application and the method for testing self-discharge of a battery provided by the embodiments of the present application have the same advantageous effects as the method adopted, operated or implemented by the application program stored therein, because of the same inventive concept.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and are intended to be included within the scope of the claims and description. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A method of testing self-discharge of a battery, comprising:

calculating an external resistance value and an external duration based on the electrical parameters of the battery to be tested;

performing parallel operation of the external connection duration on the battery to be tested, wherein the parallel operation is used for connecting the battery to be tested and an external resistor with the external connection resistance in parallel;

determining the voltage drop of the battery to be tested obtained through the parallel operation, and calculating to obtain a self-discharge result of the battery to be tested based on the voltage drop;

wherein, based on the electrical parameter of the battery to be tested, calculate external resistance, include:

taking a target resistance value smaller than the limit value of the external resistor as the external resistor;

wherein the method further comprises:

2. The method of claim 1, wherein determining an external resistance limit based on the self-discharge rate limit of the battery to be tested comprises:

3. The method according to claim 1, wherein the determining the sample power variation of the battery to be tested in the case where the sample voltage variation reaches the preset voltage variation includes:

and inquiring from the numerical association relation based on the sample voltage variation to obtain the sample electric quantity variation of the battery to be tested.

4. The method according to any one of claims 1-2, wherein said parallel operation of said external connection time period for said battery to be tested comprises:

5. The method of any of claims 1-2, wherein said determining that the parallel operation results in a voltage drop of the battery to be tested comprises:

6. The method of any of claims 1-2, wherein calculating a self-discharge result of the battery to be tested based on the voltage drop comprises:

7. A system for testing self-discharge of a battery, characterized in that it comprises a voltage measurement module, a parallel resistance module, a battery access device and a processing device, for performing the method for testing self-discharge of a battery according to any of claims 1-6;

the voltage measurement module is connected with the processing device;

the battery access device is used for connecting a battery to be tested, and is used for being connected with the voltage measurement module to form a voltage measurement loop in a first state, and is connected with the parallel resistor module to form a self-discharge loop in a second state.

8. The system of claim 7, wherein the parallel resistance module comprises at least one parallel branch;

the parallel branch circuit comprises a first external port, a second external port and at least one resistor, wherein one end of a circuit formed by the at least one resistor is connected with the first external port, and the other end of the circuit is connected with the second external port;

the first external ports of all the parallel branches are mutually independent, and the second external ports of all the parallel branches are mutually independent;

the first external port and the second external port are respectively used for connecting the positive terminal and the negative terminal of the battery access device.

9. The system of claim 7 or 8, wherein the voltage measurement module comprises a code scanning element, a measurement element, a first port, and a second port;

the code scanning element and the measuring element are connected in parallel between the first port and the second port, and the first port and the second port are respectively used for connecting the positive electrode end and the negative electrode end of the battery access device;

the code scanning element and the measuring element are both connected with the processing device.

10. The system of claim 7 or 8, wherein the battery access device comprises a first switch, a second switch, a positive connection terminal, and a negative connection terminal;

the positive electrode connecting terminal and the negative electrode connecting terminal are respectively used for connecting the positive electrode and the negative electrode of the battery to be tested;

one end of the first switch is connected with the positive electrode connecting terminal, and the other end of the first switch is used for switching connection between the positive electrode end of the voltage measuring module or the positive electrode end of the parallel resistor module;

one end of the second switch is connected with the negative electrode connecting terminal, and the other end of the second switch is used for switching connection between the negative electrode end of the voltage measuring module or the negative electrode end of the parallel resistor module.

11. The system of claim 7 or 8, wherein the system further comprises a transport mechanism;

the battery access device is arranged on the conveying mechanism, and the conveying mechanism is connected with the processing device;

the processing device is used for controlling the conveying mechanism to drive the battery access device to move towards the voltage measurement module in the first state, and controlling the conveying mechanism to drive the battery access device to move towards the parallel resistor module in the second state.

12. The system of claim 11, wherein the conveyor mechanism comprises a rack and a conveyor belt;

the bracket is arranged between the voltage measurement module and the parallel resistor module;

the battery access device is in sliding connection with the bracket, and the conveyor belt is fixedly connected with the battery access device;

the processing device is used for controlling the conveyor belt to drive the battery access device to move on the support.

13. An apparatus for testing self-discharge of a battery, comprising:

a determining module configured to determine a voltage drop of the battery to be tested obtained by the parallel operation, and calculate a self-discharge result of the battery to be tested based on the voltage drop;

wherein the apparatus further comprises:

14. An electronic device, comprising:

a memory for storing executable instructions; the method comprises the steps of,

a processor for executing the executable instructions to perform the operations of the method of any one of claims 1-6.

15. A computer readable storage medium storing computer readable instructions for performing the operations of the method of any one of claims 1-6.