CN119064811B

CN119064811B - Insulation performance detection method, apparatus, device, storage medium, and program product

Info

Publication number: CN119064811B
Application number: CN202411571412.0A
Authority: CN
Inventors: 郭澳凯; 陈伟杰; 李前邓; 王兴昌; 叶伏明
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-11-06
Filing date: 2024-11-06
Publication date: 2025-03-04
Anticipated expiration: 2044-11-06
Also published as: CN119064811A

Abstract

The present application relates to an insulation performance detection method, device, equipment, storage medium and program product. The method includes: obtaining the electrode-to-ground voltage of the battery to be tested collected by the voltage sampling unit, obtaining the reference-to-ground voltage of the battery to be tested collected by the voltage sampling unit according to the sampling error information of the voltage sampling unit, and obtaining the positive electrode insulation resistance and negative electrode insulation resistance of the battery to be tested according to the current balance relationship expression between the positive and negative electrodes of the battery to be tested, the positive electrode-to-ground voltage, the negative electrode-to-ground voltage and the reference-to-ground voltage, and determining the insulation performance detection result of the battery to be tested according to the positive electrode insulation resistance and the negative electrode insulation resistance; the electrode-to-ground voltage includes the positive electrode-to-ground voltage and the negative electrode-to-ground voltage. In the above method, the reference-to-ground voltage is determined based on the sampling error information of the voltage sampling unit, taking into account the influence of the sampling error information of the voltage sampling unit on the detection result, and correspondingly improving the accuracy of the insulation performance detection result.

Description

Insulation performance detection method, apparatus, device, storage medium, and program product

Technical Field

The present application relates to the field of battery detection technology, and in particular, to a method, apparatus, device, storage medium, and program product for detecting insulation performance.

Background

With the continuous development of new energy technology, more and more devices using electric energy as a power source are also available.

Taking a new energy automobile as an example, the new energy automobile takes a battery as a power source, and has the characteristics of high voltage and high current. For high-voltage and high-current power batteries, it is important to maintain good insulation performance. Based on this, in the related art, it is generally necessary to perform insulation performance detection on the battery to determine whether the insulation performance of the battery satisfies the demand.

However, the insulation performance detection of the battery in the related art has a problem of poor accuracy.

Disclosure of Invention

Based on this, it is necessary to provide an insulation performance detection method, apparatus, device, storage medium, and program product in view of the above-described technical problems.

In a first aspect, an embodiment of the present application provides an insulation performance detection method, including:

the method comprises the steps of acquiring electrode grounding voltage of a battery to be tested, wherein the electrode grounding voltage comprises positive electrode grounding voltage and negative electrode grounding voltage;

Acquiring the reference voltage to the ground of the battery to be tested, which is acquired by the voltage sampling unit, according to the sampling error information of the voltage sampling unit;

acquiring an anode insulation resistance value and a cathode insulation resistance value of the battery to be tested according to a current balance relation expression between the anode and the cathode of the battery to be tested, an anode grounding voltage, a cathode grounding voltage and a reference grounding voltage;

and determining the insulation performance detection result of the battery to be detected according to the positive insulation resistance and the negative insulation resistance.

In the embodiment of the application, in the process of insulating property detection, the reference ground voltage is determined based on the sampling error information of the voltage sampling unit, so that the insulating property detection result of the battery to be detected is determined according to the positive ground voltage, the negative ground voltage and the reference ground voltage, the influence of the sampling error information of the voltage sampling unit on the detection result is considered, the accuracy of the insulating property detection result is correspondingly improved, and the current balance relation expression between the positive electrode and the negative electrode of the battery to be detected can be used for accurately reflecting the association relation among the positive ground voltage, the negative ground voltage, the reference ground voltage, the positive electrode insulating resistance and the negative electrode insulating resistance of the battery to be detected, so that the insulating property detection result of the battery to be detected is determined, and the data comprehensiveness and accuracy of the detection result are improved.

In one embodiment, obtaining the electrode-to-ground voltage of the battery to be measured acquired by the voltage sampling unit includes:

Under the condition that the positive electrode measuring circuit and the negative electrode measuring circuit of the battery to be measured are in a conducting state, the positive electrode sampling unit in the voltage sampling unit is controlled to collect the positive electrode grounding voltage of the battery to be measured, and the negative electrode sampling unit in the voltage sampling unit is controlled to collect the negative electrode grounding voltage of the battery to be measured.

In the embodiment of the application, under the condition that the positive electrode measuring circuit and the negative electrode measuring circuit are in a conducting state, the positive electrode voltage to ground of the battery to be measured is acquired through the positive electrode sampling unit, and the negative electrode voltage to ground of the battery to be measured is acquired through the negative electrode sampling unit, so that the insulation performance detection result of the battery to be measured can be determined later, the comprehensiveness of data is improved, and the reliability of the insulation performance detection result is synchronously improved.

In one embodiment, according to sampling error information of the voltage sampling unit, obtaining the reference voltage to ground of the battery to be measured acquired by the voltage sampling unit includes:

Determining a target measuring circuit to be disconnected in an anode measuring circuit and a cathode measuring circuit of a battery to be measured according to sampling error information;

and under the condition that the target measurement circuit is in an off state, controlling the voltage sampling unit to acquire the reference voltage to the ground of the battery to be measured.

In the embodiment of the application, the target measurement circuit to be disconnected is determined based on the sampling error information, so that the ground voltage of the closed measurement circuit is obtained as the reference ground voltage for subsequent determination of the insulation performance detection result of the battery to be tested, the reference ground voltage with higher accuracy is obtained based on the sampling error information, and the accuracy of the insulation performance detection result determined based on the reference ground voltage is correspondingly improved.

In one embodiment, the voltage sampling unit comprises a positive electrode sampling unit and a negative electrode sampling unit, and the method for determining a target measuring circuit to be disconnected in a positive electrode measuring circuit and a negative electrode measuring circuit of the battery to be tested according to sampling error information comprises the following steps:

Determining a reference ratio according to a first sampling error of the positive electrode sampling unit and a second sampling error of the negative electrode sampling unit in the sampling error information;

and determining a target measurement circuit according to the electrode ground voltage and the reference ratio.

In the embodiment of the application, the target measuring circuit is determined simultaneously by the first sampling error of the positive electrode sampling unit and the second sampling error of the negative electrode sampling unit under the condition that the voltage sampling unit comprises the positive electrode sampling unit and the negative electrode sampling unit, and the method is suitable for the application environment of respectively sampling the positive electrode grounding voltage and the negative electrode grounding voltage by the two sampling units, so that the accuracy of the insulation performance detection result under the application environment is improved.

In one embodiment, determining the reference ratio according to the first sampling error of the positive sampling unit and the second sampling error of the negative sampling unit in the sampling error information includes:

obtaining a difference function between a first error function and a second error function, wherein the first error function comprises a first sampling error, and the second error function comprises a second sampling error;

acquiring voltage data acquired by the positive electrode sampling unit and the negative electrode sampling unit under the working conditions of different insulation resistance values;

and determining a reference ratio according to the voltage data and the difference function under each working condition.

In the embodiment of the application, the process of determining the reference ratio is converted into the function problem, so that the method is suitable for program implementation, and the efficiency of determining the reference ratio is improved.

In one embodiment, determining the reference ratio from the voltage data and the difference function under each operating condition includes:

inputting the positive electrode grounding voltage, the negative electrode reference grounding voltage and the positive electrode reference grounding voltage in the voltage data into a difference function aiming at each working condition to obtain a difference value under the working condition;

and determining a reference ratio according to the difference value under each working condition.

In the embodiment of the application, the difference value is determined based on the voltage data under the actual working condition, so that the reference ratio is determined according to the specific difference value, the matching degree between the obtained reference ratio and the actual working condition is improved, and the accuracy of the insulation performance detection result obtained based on the reference ratio can be correspondingly improved.

In one embodiment, determining the reference ratio based on the difference value under each condition includes:

determining a working condition corresponding to the difference value with the minimum absolute value in the working conditions as a target working condition;

and acquiring the positive electrode grounding voltage and the negative electrode grounding voltage under the target working condition, and determining a reference ratio according to the ratio of the positive electrode grounding voltage to the negative electrode grounding voltage under the target working condition.

In the embodiment of the application, the target working condition corresponds to the working condition with the minimum absolute value difference value, the reference ratio is determined based on the positive electrode voltage to ground and the negative electrode voltage to ground under the target working condition, and the accuracy of the insulating property detection result obtained based on the reference ratio can be correspondingly improved.

In one embodiment, determining a target measurement circuit from an electrode-to-ground voltage and a reference ratio comprises:

acquiring positive and negative voltage ratio values of positive electrode grounding voltage and negative electrode grounding voltage;

Under the condition that the positive and negative voltage ratio value is larger than the reference ratio value, determining the target measuring circuit as an anode measuring circuit of the battery to be measured;

And under the condition that the positive and negative voltage ratio value is smaller than or equal to the reference ratio value, determining the target measuring circuit as a negative electrode measuring circuit of the battery to be measured.

In the embodiment of the application, the reference ratio is the critical parameter determined based on different actual working conditions and the sampling error information of the voltage sampling unit, and the influence of the sampling error on different actual working conditions of the battery is considered, so that the accuracy and the reliability of the detection result are improved.

In one embodiment, the current balance relation expression comprises an expression of a first state and an expression of a second state, and the method comprises the steps of obtaining an anode insulation resistance and a cathode insulation resistance of the battery to be tested according to the current balance relation expression between the anode and the cathode of the battery to be tested, the anode ground voltage, the cathode ground voltage and the reference ground voltage, and comprises the following steps:

Inputting the positive electrode grounding voltage, the negative electrode grounding voltage, the resistance value of a resistance unit in a positive electrode measuring circuit of the battery to be measured and the resistance value of the resistance unit in a negative electrode measuring circuit into an expression in a first state, inputting the positive electrode grounding voltage, the negative electrode grounding voltage, the resistance value of the resistance unit in the positive electrode measuring circuit, the resistance value of the resistance unit in the negative electrode measuring circuit and the reference grounding voltage into an expression in a second state, and solving to obtain the positive electrode insulation resistance value and the negative electrode insulation resistance value of the battery to be measured;

The first state indicates that the positive electrode measuring circuit and the negative electrode measuring circuit of the battery to be measured are in a conducting state, and the second state indicates that one of the positive electrode measuring circuit and the negative electrode measuring circuit is in a disconnecting state and the other is in a conducting state.

In the embodiment of the application, the positive insulation resistance and the negative insulation resistance of the battery to be tested are determined based on the first state expression and the second state expression formed by the positive measurement circuit and the negative measurement circuit under different on-off states, and the positive insulation resistance and the negative insulation resistance are solved in a mode of combining the two state expressions, so that the detection efficiency is improved.

In a second aspect, an embodiment of the present application further provides an insulation performance detection apparatus, including:

The first acquisition module is used for acquiring the electrode grounding voltage of the battery to be tested acquired by the voltage sampling unit, wherein the electrode grounding voltage comprises an anode grounding voltage and a cathode grounding voltage;

The second acquisition module is used for acquiring the reference voltage to the ground of the battery to be tested acquired by the voltage sampling unit according to the sampling error information of the voltage sampling unit;

The resistance value acquisition module is used for acquiring an anode insulation resistance value and a cathode insulation resistance value of the battery to be tested according to a current balance relation expression between the anode and the cathode of the battery to be tested, an anode grounding voltage, a cathode grounding voltage and a reference grounding voltage;

and the result determining module is used for determining the insulation performance detection result of the battery to be detected according to the positive insulation resistance and the negative insulation resistance.

In a third aspect, an embodiment of the present application further provides a computer device, including a memory and a processor, where the memory stores a computer program, and the processor implements the steps in the insulation performance detection method provided in any one of the embodiments of the first aspect when executing the computer program.

In a fourth aspect, embodiments of the present application further provide a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps in the insulation performance detection provided by any of the embodiments of the first aspect described above.

In a fifth aspect, embodiments of the present application also provide a computer program product comprising a computer program which, when executed by a processor, implements the steps in the insulation performance detection provided by any of the embodiments of the first aspect.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

FIG. 1 is a schematic view of an application environment of an insulation performance detection method in an embodiment;

FIG. 2 is a flow chart of a method for detecting insulation performance according to an embodiment;

FIG. 3 is a flow chart of a method for obtaining a reference voltage to ground according to one embodiment;

FIG. 4 is a flow diagram of a determination target measurement circuit in one embodiment;

FIG. 5 is a flow chart of determining a reference ratio in one embodiment;

FIG. 6 is a flow chart of determining a reference ratio in another embodiment;

FIG. 7 is a flow chart of determining a reference ratio in another embodiment;

FIG. 8 is a flow chart of another embodiment of determining a target measurement circuit;

FIG. 9 is a flow chart of an insulation performance detection method according to another embodiment;

FIG. 10 is a flow chart of reference ratio in another embodiment;

FIG. 11 is a block diagram showing the structure of an insulation performance detecting apparatus in one embodiment;

fig. 12 is an internal structural diagram of a computer device in one embodiment.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the 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 terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "comprising" and any variations thereof in the description of the application and the claims and the above description of the drawings are intended to cover non-exclusive inclusions.

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 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 embodiment of the present application, the term "and/or" is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B, and may indicate that a exists alone, while a and B exist together, and B exists alone. In the description of embodiments of the present application, the term "plurality" refers to two or more (including two) unless specifically defined otherwise.

Taking a new energy automobile as an example, the new energy automobile takes a battery as a power source, and has the characteristics of high voltage and high current. For high-voltage and high-current power batteries, it is important to maintain good insulation performance.

In the related art, an insulation detection circuit is generally configured for a battery to be tested to detect insulation performance of the battery, so as to determine whether the insulation performance of the battery meets requirements. The insulation detection circuit comprises a voltage sampling unit for sampling voltage, and the control chip can calculate the insulation resistance value of the battery to be detected based on the voltage data acquired by the voltage sampling unit and serve as an insulation performance detection result of the battery to be detected.

However, due to the influence of electrical components (such as an analog-to-digital converter) in the voltage sampling unit, an inherent sampling error exists in the voltage sampling unit, the accuracy of the acquired voltage data is directly influenced, and the accuracy of an insulation performance detection result based on the voltage data is correspondingly reduced. In addition, aiming at the situation that two voltage sampling units are included to sample the positive electrode voltage to the ground and the negative electrode voltage to the ground of the battery to be detected respectively, sampling errors between the two voltage sampling units deviate, the problem of voltage data accuracy is aggravated, the gap between the detection result and the actual situation is increased, and the accuracy of the detection result is reduced.

For this purpose, the application provides an insulation performance detection method which can be applied to the application environment shown in fig. 1. The positive electrode of the battery 100 to be measured is connected with the resistor unit M1 through the switch S1 and grounded to form a positive electrode measuring circuit, and the negative electrode is connected with the resistor unit M2 through the switch S2 and grounded to form a negative electrode measuring circuit. The positive electrode measuring circuit and the negative electrode measuring circuit are connected with the voltage sampling unit A so as to collect the positive electrode grounding voltage of the battery to be measured under the condition that the switch S1 is closed and the negative electrode grounding voltage of the battery to be measured under the condition that the switch S2 is closed through the voltage sampling unit. The control chip 200 may acquire voltage data acquired by the voltage sampling unit a to determine an insulation performance detection result of the battery 100 to be tested according to the voltage data.

It will be appreciated by those skilled in the art that the architecture shown in fig. 1 is merely a block diagram of some of the architecture relevant to the embodiments of the present application and is not intended to limit the computer device to which the embodiments of the present application may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.

In one embodiment, the present application provides an insulation performance detection method, for example, the method is applied to the control chip in fig. 1, as shown in fig. 2, and the method includes the following steps:

and S210, acquiring electrode grounding voltage of the battery to be tested, wherein the electrode grounding voltage comprises positive electrode grounding voltage and negative electrode grounding voltage, and the electrode grounding voltage is acquired by the voltage sampling unit.

The voltage acquisition unit comprises a positive electrode sampling unit and a negative electrode sampling unit, wherein the positive electrode sampling unit is used for sampling to obtain the positive electrode ground voltage of the battery to be tested, and the negative electrode sampling unit is used for sampling to obtain the negative electrode ground voltage of the battery to be tested.

Optionally, the control chip may obtain the sum of the positive electrode ground voltages collected by the positive electrode sampling unit and the negative electrode ground voltage collected by the negative electrode sampling unit, and use the positive electrode ground voltage and the negative electrode ground voltage of the battery to be tested together as the electrode ground voltage of the battery to be tested.

S220, acquiring the reference ground voltage of the battery to be tested, which is acquired by the voltage sampling unit, according to the sampling error information of the voltage sampling unit.

In practical application, the voltage sampling unit comprises an analog-to-digital converter (Analog to Digital, ADC), and the sampling error information of the voltage sampling unit can be obtained based on the sampling digital quantity bit number and the error unit value calculation of the ADC, and can be directly read in practical application. Illustratively, the error unit values include, but are not limited to, non-adjustable errors, integral non-linearity errors, gain errors, differential non-linearity errors, offset errors, root mean square noise errors, and the like.

Optionally, the control chip may read sampling error information of the positive electrode sampling unit and the negative electrode sampling unit, which are configured in advance, respectively, or may calculate, according to the number of sampling digital numbers and the number of error units of the ADC in the positive electrode sampling unit and the negative electrode sampling unit, which are input by the user, to obtain the sampling error information of the positive electrode sampling unit and the sampling error information of the negative electrode sampling unit, respectively. Where the sampling error information is typically characterized by a percentage of error.

After sampling error information of the positive electrode sampling unit and the negative electrode sampling unit is obtained, the control chip can control the positive electrode voltage to ground or the negative electrode voltage to ground of the battery to be measured, which is acquired by the positive electrode sampling unit or the negative electrode sampling unit again, based on the sampling error information of the two sampling units, and the positive electrode voltage to ground or the negative electrode voltage to ground of the battery to be measured is used as a reference voltage to ground of the battery to be measured.

Illustratively, the larger the sampling error information, the worse the sampling accuracy. Based on the above, the control chip can compare the sampling error information of the obtained positive electrode sampling unit with the sampling error information of the negative electrode sampling unit to determine the sampling unit with smaller sampling error information, so as to obtain the ground voltage obtained by sampling by the sampling unit as the reference ground voltage.

For example, the negative electrode ground voltage of the battery to be measured collected by the negative electrode sampling unit is obtained as the reference ground voltage when the sampling error information of the positive electrode sampling unit is larger than the sampling error information of the negative electrode sampling unit, the positive electrode ground voltage of the battery to be measured collected by the positive electrode sampling unit is obtained as the reference ground voltage when the sampling error information of the positive electrode sampling unit is smaller than the sampling error information of the negative electrode sampling unit, and the positive electrode ground voltage of the battery to be measured collected by the positive electrode sampling unit is obtained as the reference ground voltage when the sampling error information of the positive electrode sampling unit is equal to the sampling error information of the negative electrode sampling unit.

S230, acquiring an anode insulation resistance value and a cathode insulation resistance value of the battery to be tested according to the current balance relation expression between the anode and the cathode of the battery to be tested, the anode grounding voltage, the cathode grounding voltage and the reference grounding voltage.

The current balance relation expression between the positive electrode and the negative electrode of the battery to be tested can be obtained based on kirchhoff voltage law. The current balance relation expression comprises an anode grounding voltage, a cathode grounding voltage, a reference grounding voltage and a relation between an anode insulation resistance and a cathode insulation resistance of the battery to be tested.

Optionally, the control chip may directly read a current balance relation expression between the positive electrode and the negative electrode of the battery to be measured, which is constructed in advance based on kirchhoff's voltage law, and input the collected positive electrode voltage to ground, the collected negative electrode voltage to ground and the collected reference voltage to ground into the current balance relation expression, so as to calculate and obtain the positive electrode insulation resistance and the negative electrode insulation resistance of the battery to be measured.

S240, determining an insulation performance detection result of the battery to be detected according to the positive insulation resistance and the negative insulation resistance.

The insulation performance detection result of the battery to be detected is used for representing the insulation performance of the battery to be detected. The insulation performance detection result may include a classification result of whether the battery to be tested meets an insulation requirement, or may include an insulation resistance value of the battery to be tested.

Optionally, the control chip may directly use the obtained positive insulation resistance and negative insulation resistance of the battery to be tested as an insulation performance detection result of the battery to be tested, or may determine whether the battery to be tested meets an insulation requirement based on the positive insulation resistance and the negative insulation resistance, and use whether the battery to be tested meets the insulation requirement as an insulation performance detection result of the battery to be tested.

The control chip determines that the insulation performance detection result of the battery to be tested is that the battery to be tested meets the insulation requirement under the condition that the positive insulation resistance value of the battery to be tested is larger than the positive insulation threshold value and the negative insulation resistance value of the battery to be tested is larger than the negative insulation threshold value, and otherwise determines that the insulation performance detection result of the battery to be tested is that the battery to be tested does not meet the insulation requirement under the condition that the positive insulation resistance value of the battery to be tested is smaller than the positive insulation threshold value or the negative insulation resistance value of the battery to be tested is smaller than the negative insulation threshold value.

According to the embodiment of the application, the electrode grounding voltage of the battery to be detected, which is acquired by the voltage sampling unit, is acquired according to the sampling error information of the voltage sampling unit, so that the insulation performance detection result of the battery to be detected is determined according to the electrode grounding voltage and the reference grounding voltage, wherein the electrode grounding voltage comprises the positive electrode grounding voltage and the negative electrode grounding voltage. In the method, in the process of insulating property detection, the reference ground voltage is determined based on the sampling error information of the voltage sampling unit, so that the insulating property detection result of the battery to be detected is determined according to the positive ground voltage, the negative ground voltage and the reference ground voltage, the influence of the sampling error information of the voltage sampling unit on the detection result is considered, the accuracy of the insulating property detection result is correspondingly improved, and the current balance relation expression between the positive electrode and the negative electrode of the battery to be detected can be used for accurately reflecting the relation among the positive ground voltage, the negative ground voltage, the reference ground voltage, the positive electrode insulation resistance and the negative electrode insulation resistance of the battery to be detected, so that the insulating property detection result of the battery to be detected is determined, and the data comprehensiveness and the accuracy of the detection result are improved.

Based on this, in one embodiment, the step S210 of acquiring the electrode-to-ground voltage of the battery to be tested acquired by the voltage sampling unit includes:

As shown in fig. 1, the positive electrode sampling unit A1 is used for sampling voltages at two ends of the resistor unit M1 in the positive electrode measuring circuit to serve as a positive electrode ground voltage Up1 of the battery to be measured, and the negative electrode sampling unit A2 is used for sampling voltages at two ends of the resistor unit M2 in the negative electrode measuring circuit to serve as a negative electrode ground voltage Un1 of the battery to be measured.

Optionally, the control chip may control the switches S1 and S2 to turn on the positive electrode measurement circuit and the negative electrode measurement circuit of the battery to be measured, so as to control the positive electrode sampling unit to collect the positive electrode ground voltage of the battery to be measured and control the negative electrode sampling unit to collect the negative electrode ground voltage of the battery to be measured under the condition that the positive electrode measurement circuit and the negative electrode measurement circuit are in a conductive state.

In the embodiment of the application, the electrode grounding voltage comprises an anode grounding voltage and a cathode grounding voltage, and under the condition that an anode measuring circuit and a cathode measuring circuit of a battery to be tested are in a conducting state, an anode sampling unit in a voltage sampling unit is controlled to collect the anode grounding voltage of the battery to be tested, and a cathode sampling unit in the voltage sampling unit is controlled to collect the cathode grounding voltage of the battery to be tested. In the method, under the condition that the positive electrode measuring circuit and the negative electrode measuring circuit are in the conducting state, the positive electrode voltage to ground of the battery to be measured is acquired through the positive electrode sampling unit, and the negative electrode voltage to ground of the battery to be measured is acquired through the negative electrode sampling unit, so that the insulation performance detection result of the battery to be measured can be determined later, the comprehensiveness of data is improved, and the reliability of the insulation performance detection result is synchronously improved.

The reference voltage to ground of the battery to be measured is the voltage to ground of the measuring circuit which is in the conducting state and is collected under the condition that one of the positive electrode measuring circuit and the negative electrode measuring circuit is in the disconnecting state. Therefore, in one embodiment, as shown in fig. 3, S220, according to the sampling error information of the voltage sampling unit, the obtaining the reference voltage to ground of the battery to be measured acquired by the voltage sampling unit includes:

s310, determining a target measuring circuit to be disconnected in an anode measuring circuit and a cathode measuring circuit of the battery to be tested according to sampling error information.

Optionally, after error information of the positive electrode sampling unit and the negative electrode sampling unit is obtained respectively, the control chip can compare the positive electrode sampling unit and the negative electrode sampling unit, so that a measurement circuit to be disconnected in the positive electrode measurement circuit and the negative electrode measurement circuit is determined as a target measurement circuit according to a comparison result.

The control chip may determine that the positive electrode measurement circuit is a target measurement circuit to be disconnected when the sampling error information of the positive electrode sampling unit is greater than the sampling error information of the negative electrode sampling unit, and may determine that the negative electrode measurement circuit is a target measurement circuit to be disconnected when the sampling error information of the positive electrode sampling unit is less than the sampling error information of the negative electrode sampling unit, and may determine that any one of the positive electrode measurement circuit and the negative electrode measurement circuit is a target measurement circuit to be disconnected when the sampling error information of the positive electrode sampling unit is equal to the sampling error information of the negative electrode sampling unit.

S320, under the condition that the target measurement circuit is in an off state, the voltage sampling unit is controlled to acquire the reference voltage to the ground of the battery to be measured.

Optionally, after determining the target measurement circuit to be disconnected, the control chip may control the switch in the target measurement circuit to be disconnected, so as to control the voltage sampling unit to collect the reference voltage to ground of the battery to be tested under the condition that the target measurement circuit is in a disconnected state.

The control chip may control the switch S1 to be opened and the switch S2 to be closed to control the negative electrode sampling unit to collect the negative electrode ground voltage Un2 of the battery to be measured as the reference ground voltage (i.e., the negative electrode reference ground voltage) after obtaining the positive electrode ground voltage and the negative electrode ground voltage in the on state of the positive electrode measurement circuit and the negative electrode measurement circuit, and control the switch S2 to be opened and the switch S1 to be closed to control the positive electrode sampling unit to collect the positive electrode ground voltage Up2 of the battery to be measured as the reference ground voltage (i.e., the positive electrode reference ground voltage) when determining that the target measurement circuit is the negative electrode measurement circuit.

In the embodiment of the application, a target measuring circuit to be disconnected in an anode measuring circuit and a cathode measuring circuit of a battery to be measured is determined according to sampling error information, and a voltage sampling unit is controlled to acquire the reference voltage to the ground of the battery to be measured under the condition that the target measuring circuit is in a disconnected state. According to the method, the target measurement circuit to be disconnected is determined based on the sampling error information, so that the ground voltage of the closed measurement circuit is obtained as the reference ground voltage, the insulation performance detection result of the battery to be detected is determined later, the reference ground voltage with higher accuracy is obtained based on the sampling error information, and the accuracy of the insulation performance detection result determined based on the reference ground voltage is improved correspondingly.

In case that the voltage sampling unit includes a positive electrode sampling unit and a negative electrode sampling unit, the sampling error information of the voltage sampling unit includes a first sampling error of the positive electrode sampling unit and a second sampling error of the negative electrode sampling unit, respectively. Therefore, in one embodiment, as shown in fig. 4, S310, determining, according to the sampling error information, a target measurement circuit to be disconnected from a positive measurement circuit and a negative measurement circuit of the battery to be tested, includes:

S410, determining a reference ratio according to a first sampling error of the positive electrode sampling unit and a second sampling error of the negative electrode sampling unit in the sampling error information.

Wherein the first sampling error is determined based on hardware configuration information of the positive electrode sampling unit, and the second sampling error is determined based on hardware configuration information of the negative electrode sampling unit. The reference ratio voltage is used for indicating a target measuring circuit to be disconnected in the positive electrode measuring circuit and the negative electrode measuring circuit.

Optionally, for the case that the voltage sampling unit includes a positive electrode sampling unit and a negative electrode sampling unit, the control chip may read a first sampling error of the positive electrode sampling unit and a second sampling error of the negative electrode sampling unit in the sampling error information, so as to determine the reference ratio according to the first sampling error and the second sampling error.

S420, determining a target measurement circuit according to the electrode ground voltage and the reference ratio.

Optionally, the control chip may obtain a ratio between the positive electrode ground voltage and the negative electrode ground voltage of the battery to be measured, that is, a positive-negative voltage ratio, so as to determine the target measurement circuit according to the positive-negative voltage ratio and the reference ratio.

In the embodiment of the application, the voltage sampling unit comprises a positive electrode sampling unit and a negative electrode sampling unit, a reference ratio is determined according to a first sampling error of the positive electrode sampling unit and a second sampling error of the negative electrode sampling unit in the sampling error information, and a target measuring circuit is determined according to the electrode ground voltage and the reference ratio. In the method, under the condition that the voltage sampling unit comprises the positive electrode sampling unit and the negative electrode sampling unit, the target measuring circuit is determined simultaneously through the first sampling error of the positive electrode sampling unit and the second sampling error of the negative electrode sampling unit, and the method is suitable for the application environment of respectively sampling the positive electrode grounding voltage and the negative electrode grounding voltage through the two sampling units, so that the accuracy of the insulation performance detection result under the application environment is improved.

In practical application, the reference ratio can be determined by combining voltage data of the battery to be tested under the working conditions of different insulation resistance values. In one embodiment, as shown in fig. 5, the determining the reference ratio according to the first sampling error of the positive sampling unit and the second sampling error of the negative sampling unit in the sampling error information in S410 includes:

S510, obtaining a difference function between a first error function and a second error function, wherein the first error function comprises a first sampling error, and the second error function comprises a second sampling error.

The first error function is used for representing error information generated by the positive electrode sampling unit, and the first error function is used for representing error information generated by the negative electrode sampling unit.

It should be noted that, when the insulation performance detection result of the battery to be detected is determined later, not only the reference voltage to ground is needed, but also the voltage to ground of the other electrode is needed to be determined based on the reference voltage to ground, so that a new voltage error is introduced.

Accordingly, the first error function not only comprises the first sampling error of the positive electrode sampling unit, but also comprises the first voltage error introduced by the positive electrode sampling unit, and correspondingly, the second error function not only comprises the second sampling error of the negative electrode sampling unit, but also comprises the second voltage error introduced by the negative electrode sampling unit.

For example, when the first sampling error of the positive electrode sampling unit is α and the reference ground voltage is the positive electrode reference ground voltage Up2 collected by the positive electrode sampling unit, the first voltage error introduced is Up2×α/(up1+un 1-Up 2), and the first error function F1 is determined based on the first sampling error and the first voltage error. For example, f1=α+up2/(up1+un 1-up2), and up1+un1-up2 represents the negative electrode ground voltage determined based on the positive electrode reference ground voltage Up 2. Similarly, when the second sampling error of the negative electrode sampling unit is β and the reference ground voltage is the negative electrode reference ground voltage Un2 collected by the positive electrode sampling unit, the introduced second voltage error is Un2 β/(up1+un 1-Un 2), and the second error function F2 is determined based on the second sampling error and the second voltage error. For example, f2=β+un2/(up1+un1-un2), up1+un1-un2 represents the positive ground voltage determined based on the negative reference ground voltage Un 2.

Optionally, after the first error function and the second error function are obtained, the control chip may use an expression of subtracting the second error function from the first error function as a difference function between the first error function and the second error function. Wherein the difference function f=f1-F2.

S520, acquiring voltage data acquired by the positive electrode sampling unit and the negative electrode sampling unit under the working conditions of different insulation resistance values.

Optionally, before acquiring the voltage data, the user may replace the battery to be measured in fig. 1 with a reference battery with a known insulation resistance value, the control chip may acquire the voltage data acquired by the positive electrode sampling unit and the negative electrode sampling unit under the working condition, update the reference battery, and the control chip may correspondingly acquire the voltage data under the new working condition.

S530, determining a reference ratio according to the voltage data and the difference function under each working condition.

Optionally, after the voltage data under each working condition is obtained, the voltage data under each working condition can be brought into the determined difference function, so as to obtain a difference value corresponding to each working condition, and a reference ratio is determined based on the difference value corresponding to each working condition.

In the embodiment of the application, the reference ratio is determined according to the voltage data and the difference function under different working conditions by acquiring the difference function between the first error function and the second error function and acquiring the voltage data acquired by the positive electrode sampling unit and the negative electrode sampling unit under the working conditions with different insulation resistance values, wherein the first error function comprises the first sampling error and the second error function comprises the second sampling error, and the process of determining the reference ratio is converted into the function problem, so that the method is suitable for program implementation and improves the efficiency of determining the reference ratio.

The voltage data under each condition includes voltage data collected at different sampling phases. Based on this, in one embodiment, as shown in fig. 6, S530 above, determining the reference ratio according to the voltage data and the difference function under each working condition includes:

And S610, inputting the positive electrode ground voltage, the negative electrode reference ground voltage and the positive electrode reference ground voltage in the voltage data into a difference function aiming at each working condition, and obtaining a difference value under the working condition.

Wherein the different sampling phases comprise a first sampling phase and a second sampling phase subsequent to the first sampling phase. The first sampling stage corresponds to a stage in which the positive electrode measuring circuit and the negative electrode measuring circuit are both in a conducting state, and the second sampling stage corresponds to a stage in which one of the positive electrode measuring circuit and the negative electrode measuring circuit is in a conducting state and the other is in a disconnecting state.

The positive electrode grounding voltage and the negative electrode grounding voltage in the voltage data are correspondingly acquired through the positive electrode sampling unit and the negative electrode sampling unit in the first sampling stage. The negative reference ground voltage and the positive reference ground voltage are correspondingly acquired through a negative sampling unit/a positive sampling unit in the second sampling stage.

Optionally, after obtaining the voltage data under different working conditions, for each working condition, the control chip may input the positive electrode ground voltage, the negative electrode reference ground voltage and the positive electrode reference ground voltage in the voltage data under the working condition into a difference function, and calculate to obtain a difference value under the working condition.

S620, determining a reference ratio according to the difference value under each working condition.

Optionally, after obtaining the difference value under each working condition, the control chip may determine the reference ratio based on each difference value. For example, the control chip may select the difference values satisfying the preset value range from all the difference values, and obtain an average value of the positive electrode ground voltage and the negative electrode ground voltage ratios of the difference values as the reference ratio.

In the embodiment of the application, aiming at each working condition, the positive electrode ground voltage, the negative electrode reference ground voltage and the positive electrode reference ground voltage in the voltage data are input into a difference function to obtain a difference value under the working condition, so that a reference ratio is determined according to the difference value under each working condition. According to the method, the difference value is determined based on the voltage data under the actual working condition, so that the reference ratio is determined according to the specific difference value, the matching degree between the obtained reference ratio and the actual working condition is improved, and the accuracy of the insulation performance detection result obtained based on the reference ratio can be correspondingly improved.

The reference ratio is the ratio of the positive electrode to the negative electrode to the ground voltage under the target working condition. In one embodiment, as shown in fig. 7, S620, determining the reference ratio according to the difference value under each working condition includes:

s710, determining the working condition corresponding to the difference value with the minimum absolute value in the working conditions as a target working condition.

Optionally, after obtaining the difference value under each working condition, the control chip may compare each difference value, determine the difference value with the smallest absolute value from the difference value, and determine the working condition corresponding to the difference value with the smallest absolute value as the target working condition.

S720, acquiring the positive electrode grounding voltage and the negative electrode grounding voltage under the target working condition, and determining a reference ratio according to the ratio of the positive electrode grounding voltage to the negative electrode grounding voltage under the target working condition.

Optionally, after determining the target working condition, the control chip may obtain the positive electrode ground voltage and the negative electrode ground voltage in the voltage data under the target working condition, so as to obtain a ratio of the positive electrode ground voltage to the negative electrode ground voltage, and determine the reference ratio according to the ratio.

The control chip may directly use the ratio as a reference ratio, or may perform mathematical processing on the ratio to obtain a reference ratio, for example, the ratio is converted into an expression form of 1/N, where N is a positive integer by using a nearby principle, and the converted 1/N is used as the reference ratio.

In the embodiment of the application, the working condition corresponding to the difference value with the smallest absolute value in the working conditions is determined as the target working condition, so that the positive electrode grounding voltage and the negative electrode grounding voltage under the target working condition are obtained, and the reference ratio is determined according to the ratio of the positive electrode grounding voltage to the negative electrode grounding voltage under the target working condition. In the method, the target working condition corresponds to the working condition with the minimum absolute value difference value, the reference ratio is determined based on the positive electrode voltage to ground and the negative electrode voltage to ground under the target working condition, and the accuracy of the insulating property detection result obtained based on the reference ratio can be correspondingly improved.

The electrode ground voltage includes a positive electrode ground voltage and a negative electrode ground voltage, and in one embodiment, as shown in fig. 8, the determining the target measurement circuit according to the electrode ground voltage and the reference ratio in S420 includes:

s810, acquiring a positive-negative voltage ratio of the positive electrode to the ground voltage and the negative electrode to the ground voltage.

Optionally, after the control chip obtains the positive electrode ground voltage and the negative electrode ground voltage collected in the first sampling stage, the ratio of the positive electrode ground voltage to the negative electrode ground voltage, that is, the ratio of the positive voltage to the negative voltage, can be calculated. Wherein, the positive electrode voltage to ground Up1, the negative electrode voltage to ground Un1, the positive and negative voltage ratio is Up1/Un1.

S820, determining the target measuring circuit as an anode measuring circuit under the condition that the positive and negative voltage ratio value is larger than the reference ratio value.

Optionally, after the positive-negative voltage ratio is obtained, the control chip may compare the positive-negative voltage ratio with the reference ratio, and determine that the target measurement circuit is the positive measurement circuit, that is, determine that the positive measurement circuit needs to be disconnected, if the positive-negative voltage ratio is greater than the reference ratio.

S830, determining that the target measurement circuit is a negative electrode measurement circuit under the condition that the positive and negative voltage ratio value is smaller than or equal to the reference ratio value.

Optionally, after the positive-negative voltage ratio is obtained, the control chip may compare the positive-negative voltage ratio with the reference ratio, and determine that the target measurement circuit is a negative measurement circuit, that is, determine that the negative measurement circuit needs to be disconnected, if the positive-negative voltage ratio is less than or equal to the reference ratio.

In the embodiment of the application, the target measuring circuit is determined to be the positive electrode measuring circuit by acquiring the positive and negative voltage ratio values of the positive electrode voltage to the ground and the negative electrode voltage to the ground and determining that the target measuring circuit is the negative electrode measuring circuit when the positive and negative voltage ratio values are larger than the reference ratio value and when the positive and negative voltage ratio values are smaller than or equal to the reference ratio value. In the method, the reference ratio is a critical parameter determined based on different actual working conditions and sampling error information of the voltage sampling unit, and influences of sampling errors on different actual working conditions of the battery are considered, so that accuracy and reliability of a detection result are improved.

The current balance relation expression includes an expression of a first state and an expression of a second state. In one embodiment, S240, obtaining the positive insulation resistance and the negative insulation resistance of the battery to be measured according to the current balance relation expression between the positive electrode and the negative electrode of the battery to be measured, the positive electrode ground voltage, the negative electrode ground voltage, and the reference ground voltage includes:

Inputting the positive electrode grounding voltage, the negative electrode grounding voltage, the resistance value of a resistance unit in a positive electrode measuring circuit and the resistance value of the resistance unit in a negative electrode measuring circuit into an expression in a first state, inputting the positive electrode grounding voltage, the negative electrode grounding voltage, the resistance value of the resistance unit in a positive electrode measuring circuit of a battery to be measured, the resistance value of the resistance unit in the negative electrode measuring circuit and the reference grounding voltage into an expression in a second state, and solving to obtain the positive electrode insulation resistance value and the negative electrode insulation resistance value of the battery to be measured;

It should be noted that, the expression of the first state is a current balance relation expression between the positive electrode and the negative electrode of the battery to be measured in the first sampling stage, and the expression of the second state is a current balance relation expression between the positive electrode and the negative electrode of the battery to be measured in the second sampling stage.

Based on the application environment in fig. 1, the expression of the first state of the battery to be measured is as follows:

Up 1/Rp+Up1/RS1=Un1/Rn+Un1/RS 2 equation 1

In the case where the reference ground voltage is the negative reference ground voltage (corresponding to the second sampling stage in which the positive electrode measurement circuit is in the off state and the negative electrode measurement circuit is in the on state), the expression of the second state of the battery to be measured is as follows:

(up1+un 1-Un 2)/rp=un 2/rn+un2/RS2 formula 2

In the case where the reference ground voltage is the positive reference ground voltage (corresponding to the second sampling stage in which the positive electrode measurement circuit is in the on state and the negative electrode measurement circuit is in the off state), the expression of the second state of the battery to be measured is as follows:

(Up1+Un1-Up2)/Rp=Up2/Rn+Up2/RS 1 formula 3

Wherein, RS1 represents the resistance value of the resistance unit in the positive electrode measuring circuit, and RS2 represents the resistance value of the resistance unit in the negative electrode measuring circuit. Rp represents the positive insulation resistance value of the battery to be tested, and Rn represents the negative insulation resistance value of the battery to be tested.

Optionally, when the reference ground voltage is the negative reference ground voltage Un2, the control chip may input the positive ground voltage Up1 and the negative ground voltage Un1 obtained in the first sampling stage, the resistance value RS1 of the resistor unit in the positive measurement circuit, and the resistance value RS2 of the resistor unit in the negative measurement circuit into the formula 1, input the positive ground voltage Up1, the negative ground voltage Un1, and the negative reference ground voltage Un2 obtained in the second sampling stage into the formula 2, and then solve the formula 1 and the formula 2 in a column to obtain the positive insulation resistance value Rp and the negative insulation resistance value Rn of the battery to be measured.

Correspondingly, under the condition that the reference ground voltage is the positive reference ground voltage Up2, the control chip can input the positive ground voltage Up1 and the negative ground voltage Un1 obtained in the first sampling stage, the resistance RS1 of a resistor unit in the positive measurement circuit and the resistance RS2 of a resistor unit in the negative measurement circuit into a formula 1, input the positive ground voltage Up1, the negative ground voltage Un1 and the positive reference ground voltage Up2 obtained in the second sampling stage into a formula 3, and then solve the formula 1 and the formula 3 in a series to obtain the positive insulation resistance Rp and the negative insulation resistance Rn of the battery to be tested.

In the embodiment of the application, the current balance relation expression comprises an expression in a first state and an expression in a second state, wherein the first state indicates that the positive electrode measuring circuit and the negative electrode measuring circuit of the battery to be measured are in a conducting state, and the second state indicates that one of the positive electrode measuring circuit and the negative electrode measuring circuit is in a disconnecting state and the other is in a conducting state by inputting the positive electrode ground voltage, the negative electrode ground voltage, the resistance of the resistance unit in the positive electrode measuring circuit, the resistance of the resistance unit in the negative electrode measuring circuit and the reference ground voltage into the expression in the first state. In the method, the positive insulation resistance and the negative insulation resistance of the battery to be tested are determined based on the first state expression and the second state expression formed by the positive measurement circuit and the negative measurement circuit under different on-off states, and the positive insulation resistance and the negative insulation resistance are solved in a mode of combining the two state expressions, so that the detection efficiency is improved.

In order to facilitate understanding of those skilled in the art, the following describes in detail the insulation performance detection method provided by the present application, as shown in fig. 9, the method may include:

s901, under the condition that an anode measuring circuit and a cathode measuring circuit of a battery to be measured are in a conducting state, acquiring an anode grounding voltage of the battery to be measured, which is acquired by an anode sampling unit in a voltage sampling unit, and acquiring a cathode grounding voltage of the battery to be measured, which is acquired by a cathode sampling unit in the voltage sampling unit;

S902, acquiring positive and negative voltage ratio values of positive electrode grounding voltage and negative electrode grounding voltage;

S903, determining a target measuring circuit to be disconnected in the positive electrode measuring circuit and the negative electrode measuring circuit as a positive electrode measuring circuit under the condition that the positive and negative voltage ratio value is larger than a reference ratio value;

S904, determining a target measuring circuit to be disconnected in the positive electrode measuring circuit and the negative electrode measuring circuit as a negative electrode measuring circuit under the condition that the positive and negative voltage ratio value is smaller than or equal to a reference ratio value;

S905, under the condition that a target measurement circuit is in an off state, acquiring the reference voltage to ground of the battery to be measured, which is acquired by a voltage sampling unit;

S906, inputting the positive electrode grounding voltage, the negative electrode grounding voltage, the resistance value of a resistance unit in the positive electrode measuring circuit and the resistance value of the resistance unit in the negative electrode measuring circuit into a current balance relational expression in a first state, wherein the first state indicates that the positive electrode measuring circuit and the negative electrode measuring circuit of the battery to be measured are in a conducting state;

S907, inputting the positive electrode grounding voltage, the negative electrode grounding voltage, the resistance value of a resistance unit in the positive electrode measuring circuit, the resistance value of a resistance unit in the negative electrode measuring circuit and the reference grounding voltage into a current balance relation expression in a second state, wherein the second state represents that one of the positive electrode measuring circuit and the negative electrode measuring circuit is in an off state and the other is in an on state;

S908, solving the current balance relation expression of the first state and the current balance relation expression of the second state after the input parameters are listed, and obtaining the positive insulation resistance and the negative insulation resistance of the battery to be tested.

In an alternative embodiment, as shown in fig. 10, the process of determining the reference ratio based on the sampling error information of the voltage sampling unit includes:

S1001, determining a first error function according to a first sampling error of a positive electrode sampling unit in sampling error information, wherein the first error function comprises the first sampling error;

s1002, determining a second error function according to a second sampling error of the negative electrode sampling unit in the sampling error information, wherein the second error function comprises a second sampling error;

S1003, obtaining a difference function between the first error function and the second error function;

s1004, acquiring voltage data acquired by the positive electrode sampling unit and the negative electrode sampling unit under the working conditions of different insulation resistance values;

s1005, inputting a difference function of the positive electrode ground voltage, the negative electrode reference ground voltage and the positive electrode reference ground voltage in the voltage data aiming at each working condition to obtain a difference value under the working condition;

s1006, determining the working condition corresponding to the difference value with the minimum absolute value in the working conditions as a target working condition;

s1007, obtaining the positive electrode grounding voltage and the negative electrode grounding voltage under the target working condition, and determining a reference ratio according to the ratio of the positive electrode grounding voltage to the negative electrode grounding voltage under the target working condition.

It should be noted that, for the descriptions in S901-S908 and S1001-S1007, reference may be made to the descriptions related to the above embodiments, and the effects are similar, which are not repeated here.

The sampling error deviation between the two voltage sampling units (namely the positive electrode sampling unit and the negative electrode sampling unit) affects the target measuring circuit which needs to be disconnected in the second sampling stage (corresponding to the second state), the ground voltage of the other electrode is calculated by adopting the ground voltage of the closed measuring circuit obtained by sampling in the second sampling stage in the insulation detection process, and the calculation error is amplified by the existence of the sampling error. Accordingly, the presence of sampling error bias makes the degree of computational error amplification different for different target measurement circuits. In the insulation detection method, the reference ratio is determined based on the sampling error information of each of the two sampling units, and the target measurement circuit is selected by adopting the reference ratio, so that the positive insulation resistance and the negative insulation resistance of the battery to be detected can be calculated in a subsequent mode based on a smaller calculation error amplification degree, and the accuracy of the detection result is improved.

It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.

In one embodiment, as shown in FIG. 11, there is provided an insulation performance detecting apparatus, comprising a first acquisition module 1101, a second acquisition module 1102, a resistance value acquisition module 1103, and a result determining module 1104, wherein:

The first obtaining module 1101 is configured to obtain an electrode ground voltage of the battery to be tested, where the electrode ground voltage includes an anode ground voltage and a cathode ground voltage;

the second obtaining module 1102 is configured to obtain, according to sampling error information of the voltage sampling unit, a reference voltage to ground of the battery to be tested, where the reference voltage is collected by the voltage sampling unit;

The resistance value obtaining module 1103 is configured to obtain an anode insulation resistance value and a cathode insulation resistance value of the battery to be tested according to a current balance relation expression between the anode and the cathode of the battery to be tested, an anode ground voltage, a cathode ground voltage, and a reference ground voltage;

the result determining module 1104 is configured to determine an insulation performance detection result of the battery to be tested according to the positive insulation resistance value and the negative insulation resistance value.

The respective modules in the above-described insulation performance detection apparatus may be realized in whole or in part by software, hardware, and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.

In an exemplary embodiment, a computer device, which may be a terminal, is provided, and an internal structure thereof may be as shown in fig. 12. The computer device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input means. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the computer device is used to exchange information between the processor and the external device. The Communication interface of the computer device is used for conducting wired or wireless Communication with an external terminal, and the wireless Communication can be realized through WIFI, a mobile cellular network, near field Communication (NEAR FIELD Communication) or other technologies. The computer program is executed by a processor to implement a method of insulation performance detection.

It will be appreciated by those skilled in the art that the structure shown in FIG. 12 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.

In one embodiment, a computer device is provided that includes a memory having a computer program stored therein and a processor that when executing the computer program performs the steps of any of the insulation performance detection methods described above.

In one embodiment, a computer readable storage medium is provided having a computer program stored thereon, which when executed by a processor, implements the steps of any of the insulation performance detection methods described above.

In an embodiment, a computer program product is provided comprising a computer program which, when executed by a processor, implements the steps of any of the insulation performance detection methods described above.

Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims

1. An insulation performance detection method, characterized in that the method comprises:

under the condition that an anode measuring circuit and a cathode measuring circuit of a battery to be measured are in a conducting state, controlling an anode sampling unit in a voltage sampling unit to collect an anode grounding voltage of the battery to be measured, controlling a cathode sampling unit in the voltage sampling unit to collect a cathode grounding voltage of the battery to be measured, and taking the anode grounding voltage and the cathode grounding voltage as electrode grounding voltages;

Determining a target measuring circuit to be disconnected in the positive electrode measuring circuit and the negative electrode measuring circuit according to the first sampling error of the positive electrode sampling unit and the second sampling error of the negative electrode sampling unit;

Under the condition that the target measurement circuit is in an open state, controlling the voltage sampling unit to collect the ground voltage of the closed measurement circuit as the reference ground voltage of the battery to be measured;

Acquiring an anode insulation resistance and a cathode insulation resistance of the battery to be tested according to a current balance relation expression between the anode and the cathode of the battery to be tested, the anode ground voltage, the cathode ground voltage and the reference ground voltage;

And determining an insulation performance detection result of the battery to be detected according to the positive insulation resistance and the negative insulation resistance.

2. The method of claim 1, wherein determining the target measurement circuit to be disconnected from the positive electrode measurement circuit and the negative electrode measurement circuit based on the first sampling error of the positive electrode sampling unit and the second sampling error of the negative electrode sampling unit comprises:

Obtaining a difference function between a first error function and a second error function, wherein the first error function comprises the first sampling error, and the second error function comprises the second sampling error;

Inputting the positive electrode grounding voltage, the negative electrode reference grounding voltage and the positive electrode reference grounding voltage in the voltage data into the difference function aiming at each working condition to obtain a difference value under the working condition;

and determining the reference ratio according to the difference value under each working condition, and determining the target measurement circuit according to the electrode ground voltage and the reference ratio.

3. The method of claim 2, wherein said determining said reference ratio based on a difference value for each of said conditions comprises:

and acquiring the positive electrode grounding voltage and the negative electrode grounding voltage under the target working condition, and determining the reference ratio according to the ratio of the positive electrode grounding voltage to the negative electrode grounding voltage under the target working condition.

4. The method of claim 2, wherein said determining said target measurement circuit from said electrode-to-ground voltage and said reference ratio comprises:

Acquiring positive and negative voltage ratio values of the positive electrode grounding voltage and the negative electrode grounding voltage;

And under the condition that the positive and negative voltage ratio value is smaller than or equal to the reference ratio value, determining the target measuring circuit as the negative electrode measuring circuit of the battery to be measured.

5. The method of claim 1, wherein the current balance relation expression includes an expression of a first state and an expression of a second state, and wherein the obtaining positive electrode insulation resistance and negative electrode insulation resistance of the battery to be measured according to the current balance relation expression between positive and negative electrodes of the battery to be measured, the positive electrode ground voltage, the negative electrode ground voltage, and the reference ground voltage includes:

Inputting the positive electrode grounding voltage, the negative electrode grounding voltage, the resistance value of a resistance unit in a positive electrode measuring circuit of the battery to be measured and the resistance value of the resistance unit in a negative electrode measuring circuit into the expression of the first state, inputting the positive electrode grounding voltage, the negative electrode grounding voltage, the resistance value of the resistance unit in the positive electrode measuring circuit, the resistance value of the resistance unit in the negative electrode measuring circuit and the reference grounding voltage into the expression of the second state, and solving to obtain the positive electrode insulation resistance value and the negative electrode insulation resistance value of the battery to be measured;

6. The method of claim 1, wherein the reference ground voltage is a negative ground voltage collected by the negative sampling unit when the target measurement circuit is a positive measurement circuit, and wherein the reference ground voltage is a positive ground voltage collected by the positive sampling unit when the target measurement circuit is a negative measurement circuit.

7. An insulation performance detection apparatus, characterized in that the apparatus comprises:

The first acquisition module is used for controlling a positive electrode sampling unit in a voltage sampling unit to acquire positive electrode grounding voltage of the battery to be tested under the condition that a positive electrode measuring circuit and a negative electrode measuring circuit of the battery to be tested are in a conducting state, controlling a negative electrode sampling unit in the voltage sampling unit to acquire negative electrode grounding voltage of the battery to be tested, and taking the positive electrode grounding voltage and the negative electrode grounding voltage as electrode grounding voltages;

The second acquisition module is used for determining a target measurement circuit to be disconnected in the positive electrode measurement circuit and the negative electrode measurement circuit according to the first sampling error of the positive electrode sampling unit and the second sampling error of the negative electrode sampling unit;

The resistance value acquisition module is used for acquiring an anode insulation resistance value and a cathode insulation resistance value of the battery to be tested according to a current balance relation expression between the anode and the cathode of the battery to be tested, the anode ground voltage, the cathode ground voltage and the reference ground voltage;

8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.

9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.

10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.