A battery internal resistance measurement method and device based on internal resistance measurement equipment

Abstract

The present disclosure relates to a battery internal resistance measurement method based on an internal resistance measurement device, including obtaining a first internal resistance measurement result and a second internal resistance measurement result based on an internal resistance measurement module; the first internal resistance measurement result is the internal resistance measurement result of at least one battery, the second internal resistance measurement result is the internal resistance measurement result of multiple batteries, the multiple batteries are at least one battery and a target battery, the number of control switches contained in the first measurement loop corresponding to the first internal resistance measurement result is the same as the number of control switches contained in the second measurement loop corresponding to the second internal resistance measurement result; the first measurement loop includes at least one battery connected in series, and the second measurement loop includes at least one battery connected in series and a target battery; the first internal resistance measurement result and the second internal resistance measurement result are analyzed for differences to obtain a target internal resistance measurement result corresponding to the target battery. The accuracy of the battery internal resistance measurement for the target battery can be improved by using the embodiments of the present disclosure.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery internal resistance measurement, and in particular to a battery internal resistance measurement method and device based on an internal resistance measurement device. Background Art

[0002] Important indicators for measuring battery performance include battery internal resistance. Battery internal resistance refers to the resistance encountered by current flowing through the battery when the battery is working. It includes ohmic internal resistance and polarization internal resistance. Ohmic internal resistance is composed of the resistance of the battery's electrode materials, electrolyte, diaphragm, current collector and other components, as well as the contact resistance between the components, while polarization internal resistance is the additional resistance generated by the electrode reaction. The measurement of battery internal resistance is of great significance for battery performance evaluation, fault diagnosis and life prediction.

[0003] In the prior art, during the internal resistance measurement of a lithium battery pack, when an electronic switch connects the measurement circuit, the internal resistance fluctuation voltage will generate a fixed voltage bias in the measurement circuit (the influence of the electronic switch impedance and the impedance between other circuits), resulting in inaccurate internal resistance measurement results. Summary of the invention

[0004] In view of the above-mentioned technical problems, the present disclosure proposes a battery internal resistance measurement method and device based on an internal resistance measurement device.

[0005] According to one aspect of an embodiment of the present disclosure, a battery internal resistance measurement method based on an internal resistance measurement device is provided, wherein the internal resistance measurement device includes an internal resistance measurement module, and the method includes:

[0006] Based on the internal resistance measurement module, a first internal resistance measurement result and a second internal resistance measurement result are obtained; the first internal resistance measurement result is an internal resistance measurement result of at least one battery, the second internal resistance measurement result is an internal resistance measurement result of multiple batteries, the multiple batteries are the at least one battery and a target battery, the number of control switches included in a first measurement loop corresponding to the first internal resistance measurement result is the same as the number of control switches included in a second measurement loop corresponding to the second internal resistance measurement result; the first measurement loop includes the at least one battery connected in series, and the second measurement loop includes the at least one battery and the target battery connected in series;

[0007] Performing a difference analysis on the first internal resistance measurement result and the second internal resistance measurement result to obtain a target internal resistance measurement result corresponding to the target battery.

[0008] Optionally, the method further includes:

[0009] Obtaining the number of first connecting bars corresponding to the first measurement loop and the number of second connecting bars corresponding to the second measurement loop; the number of the first connecting bars is the number of battery connecting bars included in the first measurement loop, the number of the second connecting bars is the number of battery connecting bars included in the second measurement loop, and the battery connecting bars are used to realize series connection between two batteries by connecting two battery terminals;

[0010] The performing difference analysis on the first internal resistance measurement result and the second internal resistance measurement result to obtain a target internal resistance measurement result corresponding to the target battery includes:

[0011] Based on the first number of connection bars and the second number of connection bars, a difference analysis is performed on the first internal resistance measurement result and the second internal resistance measurement result to obtain the target internal resistance measurement result.

[0012] Optionally, performing a difference analysis on the first internal resistance measurement result and the second internal resistance measurement result based on the first number of connection bars and the second number of connection bars to obtain the target internal resistance measurement result includes:

[0013] When the number of the first connecting bars is equal to the number of the second connecting bars, internal resistance data difference analysis is performed on the first internal resistance measurement result and the second internal resistance measurement result to obtain the target internal resistance measurement result.

[0014] Optionally, the method further includes:

[0015] Acquiring connection bar impedance data of the battery connection bar; the connection bar impedance data represents the impedance of a single battery connection bar;

[0016] Accordingly, performing a difference analysis on the first internal resistance measurement result and the second internal resistance measurement result based on the first number of connection bars and the second number of connection bars to obtain the target internal resistance measurement result includes:

[0017] When the number of the first connecting bars is not equal to the number of the second connecting bars, a difference analysis is performed on the first internal resistance measurement result and the second internal resistance measurement result based on the connecting bar impedance data, the first connecting bar number and the second connecting bar number to obtain the target internal resistance measurement result.

[0018] Optionally, performing a difference analysis on the first internal resistance measurement result and the second internal resistance measurement result based on the connection bar impedance data, the first connection bar quantity, and the second connection bar quantity to obtain the target internal resistance measurement result includes:

[0019] Performing a quantity difference analysis on the quantity of the first connecting bars and the quantity of the second connecting bars to obtain quantity difference data; the quantity difference data is used to characterize the degree of difference between the quantity of the first connecting bars and the quantity of the second connecting bars;

[0020] Determining loop difference impedance data based on the quantity difference data and the connection bar impedance data; the loop difference impedance data characterizes the degree of difference between the impedance of the battery connection bar included in the first measurement loop and the impedance of the battery connection bar included in the second measurement loop;

[0021] The internal resistance data in the second internal resistance measurement result is subtracted from the internal resistance data in the first internal resistance measurement result, and the loop difference impedance data is subtracted to obtain the target internal resistance measurement result.

[0022] Optionally, the connecting bar impedance data is obtained in the following manner:

[0023] Acquire connection bar size data corresponding to the battery connection bar and material property information corresponding to the battery connection bar;

[0024] Based on the connecting bar size data and the material property information, impedance analysis is performed on the battery connecting bar to obtain the connecting bar impedance data.

[0025] Optionally, the internal resistance measurement device further includes a switch control module; and the first internal resistance measurement result is obtained by:

[0026] Based on the switch control module, controlling at least one first control switch to be closed; the at least one first control switch is a control switch included in the first measurement loop;

[0027] When the at least one first control switch is closed, the internal resistance of the first measurement loop is measured based on the internal resistance measurement module to obtain the first internal resistance measurement result.

[0028] Optionally, the internal resistance measurement device further includes a switch control module; and the second internal resistance measurement result is obtained by:

[0029] Based on the switch control module, controlling at least one second control switch to be closed; the at least one second control switch is a control switch included in the second measurement loop;

[0030] When the at least one second control switch is closed, the internal resistance of the second measurement loop is measured based on the internal resistance measurement module to obtain the second internal resistance measurement result.

[0031] Optionally, switch configuration information of the control switch in the first measurement loop is the same as switch configuration information of the control switch in the second measurement loop.

[0032] According to another aspect of an embodiment of the present disclosure, a battery internal resistance measuring device based on an internal resistance measuring device is provided, the device comprising:

[0033] a measurement result acquisition module, configured to acquire a first internal resistance measurement result and a second internal resistance measurement result based on the internal resistance measurement module; the first internal resistance measurement result is an internal resistance measurement result of at least one battery, the second internal resistance measurement result is an internal resistance measurement result of multiple batteries, the multiple batteries are the at least one battery and a target battery, the number of control switches included in a first measurement loop corresponding to the first internal resistance measurement result is the same as the number of control switches included in a second measurement loop corresponding to the second internal resistance measurement result; the first measurement loop includes the at least one battery connected in series, and the second measurement loop includes the at least one battery and the target battery connected in series;

[0034] The difference analysis module is used to perform a difference analysis on the first internal resistance measurement result and the second internal resistance measurement result to obtain a target internal resistance measurement result corresponding to the target battery.

[0035] The technical solution provided by the embodiments of the present disclosure brings at least the following beneficial effects:

[0036] Through the internal resistance measurement module, a first internal resistance measurement result and a second internal resistance measurement result are obtained, wherein the first internal resistance measurement result is an internal resistance measurement result of at least one battery, and the second internal resistance measurement result is an internal resistance measurement result of multiple batteries, the multiple batteries are at least one battery and a target battery, the number of control switches included in the first measurement loop corresponding to the first internal resistance measurement result is the same as the number of control switches included in the second measurement loop corresponding to the second internal resistance measurement result, the first measurement loop includes at least one battery connected in series, and the second measurement loop includes at least one battery connected in series and a target battery, and the battery internal resistance measurement of the batteries included in the two measurement loops can be achieved. Then, the first internal resistance measurement result and the second internal resistance measurement result are analyzed for differences to obtain a target internal resistance measurement result corresponding to the target battery, and on the basis of achieving the battery internal resistance measurement of the target battery, the internal resistance measurement error caused by the control switch in the measurement loop can be eliminated, thereby improving the measurement accuracy of the battery internal resistance.

[0037] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The drawings herein are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the description are used to explain the principles of the present disclosure, and do not constitute improper limitations on the present disclosure.

[0039] Figure 1 is a block diagram of an internal resistance measuring device according to an exemplary embodiment;

[0040] Figure 2 is a flow chart of a battery internal resistance measuring method based on an internal resistance measuring device according to an exemplary embodiment;

[0041] Figure 3 is a schematic diagram showing the connection of a control switch and a battery connecting bar during a battery internal resistance measurement process according to an exemplary embodiment;

[0042] Figure 4 is a schematic diagram of an internal resistance measurement process according to an exemplary embodiment;

[0043] Figure 5 is a block diagram of a battery internal resistance measuring device based on an internal resistance measuring device according to an exemplary embodiment;

[0044] Figure 6 is a block diagram of an electronic device for implementing battery internal resistance measurement of a target battery according to an exemplary embodiment;

[0045] Figure 7 is a block diagram of another electronic device for measuring the battery internal resistance of a target battery according to an exemplary embodiment. DETAILED DESCRIPTION

[0046] Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0047] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0048] In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, components and circuits well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0049] See also Figure 1 , Figure 1 is a block diagram of an internal resistance measuring device according to an exemplary embodiment. Figure 1 As shown, the internal resistance measuring device may include a processor, an internal resistance measuring module and a switch control module. The processor may be used to execute the battery internal resistance measuring method based on the internal resistance measuring device. The internal resistance measuring module may be used to implement the internal resistance measurement of any one or more batteries among a plurality of batteries to be measured to output the internal resistance measurement result. The switch control module may be used to implement the on-off control of the control switch to implement the internal resistance measurement of any one or more batteries among a plurality of batteries to be measured. The plurality of batteries to be measured may refer to a plurality of batteries connected in series.

[0050] Specifically, Figure 2 FIG. 1 is a flow chart showing a method for measuring the internal resistance of a battery based on an internal resistance measuring device according to an exemplary embodiment. Figure 2 As shown, the battery internal resistance measurement method based on the internal resistance measurement device can be used in electronic devices such as terminals or servers, and specifically may include the following steps:

[0051] S201: Based on an internal resistance measurement module, obtain a first internal resistance measurement result and a second internal resistance measurement result.

[0052] In a specific embodiment, the first internal resistance measurement result may refer to the internal resistance measurement result of at least one battery. The first internal resistance measurement result may include first internal resistance data corresponding to at least one battery. Among them, the at least one battery may refer to one battery or multiple batteries connected in series among the multiple batteries to be measured. The first internal resistance data may characterize the internal resistance of the at least one battery connected in series. It is understandable that the first internal resistance data at least includes the impedance of the control switch in the first measurement loop.

[0053] In a specific embodiment, the second internal resistance measurement result may be the internal resistance measurement result of multiple batteries. The second internal resistance measurement result may include the second internal resistance data corresponding to the above-mentioned multiple batteries. Among them, the multiple batteries are at least one battery and a target battery. The target battery may refer to the battery that currently needs to be measured to obtain an accurate internal resistance. The second internal resistance data may characterize the internal resistance of the above-mentioned multiple batteries connected in series. Specifically, the target battery may be a battery adjacent to the above-mentioned at least one battery among the multiple batteries to be measured in series. It can be understood that the second internal resistance data at least includes the impedance of the control switch in the second measurement loop.

[0054] In a specific embodiment, the number of control switches included in the first measurement loop corresponding to the first internal resistance measurement result may be the same as the number of control switches included in the second measurement loop corresponding to the second internal resistance measurement result.

[0055] In a specific embodiment, the first measurement loop may refer to a measurement loop for measuring and obtaining the first internal resistance measurement result. The first measurement loop may include at least one battery connected in series. Further, the first measurement loop may include at least one battery, at least one control switch and an internal resistance measurement module.

[0056] In a specific embodiment, the second measurement loop may refer to a measurement loop for measuring and obtaining the second internal resistance measurement result. The second measurement loop may include at least one battery and a target battery connected in series. Further, the second measurement loop may include at least one battery, a target battery, at least one control switch and an internal resistance measurement module.

[0057] In a specific embodiment, when the internal resistance measurement device further includes a switch control module, the first internal resistance measurement result may be obtained in the following manner:

[0058] Based on the switch control module, controlling at least one first control switch to be closed;

[0059] When at least one first control switch is closed, the internal resistance of the first measurement loop is measured based on the internal resistance measurement module to obtain a first internal resistance measurement result.

[0060] In a specific embodiment, the at least one first control switch may refer to a control switch included in the first measurement loop.

[0061] In a specific embodiment, when the switch control module receives the first switch control signal for at least one battery sent by the processor, it controls the at least one first control switch to be closed; accordingly, it can control the other control switches except the at least one first control switch among the control switches connected to the multiple batteries to be measured to be opened. The first switch control signal can be used to instruct the switch control module to perform a closing operation on the at least one first control switch. Specifically, the first switch control signal can be sent by the processor to obtain the first internal resistance measurement result.

[0062] In a specific embodiment, when at least one first control switch is closed, the internal resistance of the first measurement loop is measured based on the internal resistance measurement module to obtain first internal resistance data; accordingly, a first internal resistance measurement result can be generated based on the first internal resistance data. Specifically, the first internal resistance measurement result can be generated based on the battery identification information of each of the at least one battery and the first internal resistance data.

[0063] In a specific embodiment, the internal resistance measurement module may perform internal resistance measurement based on any one of a plurality of strategies such as a direct current measurement strategy or an alternating current measurement strategy, which is not limited in the present disclosure.

[0064] In a specific embodiment, when the internal resistance measurement device further includes a switch control module, the second internal resistance measurement result may be obtained in the following manner:

[0065] Based on the switch control module, controlling at least one second control switch to close;

[0066] When at least one second control switch is closed, the internal resistance of the second measurement loop is measured based on the internal resistance measurement module to obtain a second internal resistance measurement result.

[0067] In a specific embodiment, the at least one second control switch may refer to a control switch included in the second measurement loop.

[0068] In a specific embodiment, the switch control module controls the at least one second control switch to be closed when receiving the second switch control signal for multiple batteries sent by the processor; accordingly, the other control switches except the at least one second control switch among the control switches connected to the multiple batteries to be measured can be controlled to be opened. The second switch control signal can be used to instruct the switch control module to perform a closing operation on the at least one second control switch. Specifically, the second switch control signal can be sent by the processor to obtain the second internal resistance measurement result.

[0069] In a specific embodiment, when at least one second control switch is closed, the internal resistance of the second measurement loop is measured based on the internal resistance measurement module to obtain second internal resistance data; accordingly, a second internal resistance measurement result can be generated based on the second internal resistance data. Specifically, the second internal resistance measurement result can be generated based on the battery identification information of each of the at least one battery, the battery identification information of the target battery, and the second internal resistance data.

[0070] In a specific embodiment, the switch configuration information of the control switch in the first measurement loop is the same as the switch configuration information of the control switch in the second measurement loop.

[0071] In the above embodiment, by making the switch configuration information of the control switch in the first measurement loop the same as the switch configuration information of the control switch in the second measurement loop, the impedance of any control switch in the first measurement loop can be equal to the impedance of any control switch in the second measurement loop, thereby making it possible to more accurately eliminate the error caused by the impedance of the control switch in the loop during the difference analysis between the first internal resistance measurement result and the second internal resistance measurement result, thereby improving the measurement accuracy of the battery internal resistance.

[0072] In a specific embodiment, Figure 3FIG. 1 is a schematic diagram showing the connection of a control switch and a battery connection bar during a battery internal resistance measurement process according to an exemplary embodiment. Specifically, assuming that the number of the multiple batteries to be measured is 2, as shown in FIG. Figure 3 As shown, the target battery is Figure 3 The battery 1 in the embodiment of the present invention, at least one of the batteries can be Figure 3 The battery 2 in the embodiment can be Figure 3 Battery 1 and Battery 2 in. Further. The internal resistance measurement device may also include a preset number of battery control switch groups. Wherein, the preset number of batteries may refer to the number of batteries of the multiple batteries to be measured. The internal resistance measurement module may include a first internal resistance measurement unit and a second internal resistance measurement unit. Each control switch group may include a first control switch and a second control switch, and the first end of the first control switch in each control switch group may be used to connect to the anode of the switch group battery corresponding to each control switch group, and the first end of the second control switch in each control switch group may be used to connect to the cathode of the switch group battery; wherein the switch group battery may refer to the battery corresponding to each control switch group in the preset number of batteries. The two input ends of the first internal resistance measurement unit may be used to connect to the second end of the first target switch corresponding to at least one battery and the second end of the second target switch corresponding to at least one battery, respectively, the first target switch may be a control switch connected to the first battery connection terminal, the second target switch may be a control switch connected to the second battery connection terminal or a control switch connected to the second battery connection terminal through a battery connection strip; the first battery connection terminal may be one of the two outermost terminals of at least one battery, and the second battery connection terminal may be the other of the two outermost terminals of at least one battery. The two input ends of the second internal resistance measurement unit can be respectively used to connect to the second end of the third target switch corresponding to the multiple batteries and the second end of the fourth target switch corresponding to the multiple batteries, the third target switch can be a control switch connected to the third battery connection terminal, the fourth target switch can be a control switch connected to the fourth battery connection terminal, the third battery connection terminal can be one of the two outermost terminals of the multiple batteries, and the fourth battery connection terminal can be the other of the two outermost terminals of the multiple batteries. The first internal resistance measurement unit is used to measure and obtain the first internal resistance data, and the second internal resistance measurement unit is used to measure and obtain the second internal resistance data, so as to determine the target internal resistance data corresponding to the target battery based on the first internal resistance data and the second internal resistance data.

[0073] S203: Perform difference analysis on the first internal resistance measurement result and the second internal resistance measurement result to obtain a target internal resistance measurement result corresponding to the target battery.

[0074] In a specific embodiment, the target internal resistance measurement result may refer to a more accurate battery internal resistance measurement result of the target battery to be obtained. The target internal resistance measurement result may include target internal resistance data corresponding to the target battery. The target internal resistance data may be used to characterize the battery internal resistance of the target battery.

[0075] In a specific embodiment, the target internal resistance measurement result may be obtained by subtracting the internal resistance data in the first internal resistance measurement result from the internal resistance data in the second internal resistance measurement result.

[0076] In a specific embodiment, the above method may further include:

[0077] Obtain the number of first connecting bars corresponding to the first measurement loop and the number of second connecting bars corresponding to the second measurement loop;

[0078] Accordingly, performing the difference analysis on the first internal resistance measurement result and the second internal resistance measurement result to obtain the target internal resistance measurement result corresponding to the target battery may include:

[0079] Based on the first connection bar quantity and the second connection bar quantity, a difference analysis is performed on the first internal resistance measurement result and the second internal resistance measurement result to obtain a target internal resistance measurement result.

[0080] In a specific embodiment, the number of first connecting strips may refer to the number of battery connecting strips included in the first measurement loop. The battery connecting strip may be used to connect two battery terminals in series to achieve the series connection between two batteries. It is understandable that due to the impedance of the battery connecting strip, the accuracy of the internal resistance measurement of multiple batteries connected in series may be affected, that is, the internal resistance measurement results of the multiple batteries connected in series obtained by measuring the internal resistance of multiple batteries connected in series will include the impedance of the battery connecting strip.

[0081] In a specific embodiment, the internal resistance measuring device may further include a control panel. The first number of connection bars may be obtained by an internal resistance measuring person performing a data input operation on the control panel in the internal resistance measuring device so that a processor in the internal resistance measuring device can obtain the first number of connection bars. Specifically, the first number of connection bars may be determined based on the first measurement loop.

[0082] In a specific embodiment, the second connection bar quantity may refer to the quantity of battery connection bars included in the second measurement loop.

[0083] In a specific embodiment, the method for obtaining the number of the second connecting bars may refer to the method for obtaining the number of the first connecting bars described above, and the present disclosure will not elaborate on it.

[0084] In a specific embodiment, performing a difference analysis on the first internal resistance measurement result and the second internal resistance measurement result based on the first connection bar number and the second connection bar number to obtain the target internal resistance measurement result may include:

[0085] When the number of the first connecting bars is equal to the number of the second connecting bars, internal resistance data difference analysis is performed on the first internal resistance measurement result and the second internal resistance measurement result to obtain a target internal resistance measurement result.

[0086] In a specific embodiment, when the number of the first connecting bars is equal to the number of the second connecting bars, the target internal resistance measurement result can be obtained by subtracting the first internal resistance data in the first internal resistance measurement result from the second internal resistance data in the second internal resistance measurement result.

[0087] In a specific embodiment, in combination Figure 3 It can be seen that the internal resistance measurement result corresponding to battery 2 can be the internal resistance measurement result Z 2 (i.e., excluding the connecting bar impedance), the internal resistance measurement result corresponding to battery 2 can be the internal resistance measurement result Z 3 (i.e. including the connection strip impedance). Figure 3 Internal resistance measurement result Z 1 , internal resistance measurement result Z 2 , internal resistance measurement result Z 3 And the internal resistance measurement result Z 4 ), an internal resistance measurement result whose corresponding number of connecting bars is equal to the number of connecting bars corresponding to the first internal resistance measurement result can be selected from the above multiple internal resistance measurement results as the second internal resistance measurement result.

[0088] In a specific embodiment, the above method may further include:

[0089] Obtain connection bar impedance data of the battery connection bar;

[0090] Accordingly, performing difference analysis on the first internal resistance measurement result and the second internal resistance measurement result based on the first connection bar number and the second connection bar number to obtain the target internal resistance measurement result may include:

[0091] When the number of first connecting bars is not equal to the number of second connecting bars, a difference analysis is performed on the first internal resistance measurement result and the second internal resistance measurement result based on the connecting bar impedance data, the first connecting bar number and the second connecting bar number to obtain a target internal resistance measurement result.

[0092] In a specific embodiment, the connecting bar impedance data may characterize the impedance of a single battery connecting bar.

[0093] In a specific embodiment, the above-mentioned connecting bar impedance data may be obtained in the following manner:

[0094] Obtaining the connection bar size data corresponding to the battery connection bar and the material property information corresponding to the battery connection bar;

[0095] Based on the connecting bar size data and material property information, impedance analysis is performed on the battery connecting bar to obtain the connecting bar impedance data.

[0096] In a specific embodiment, the connection bar size data may characterize the structural size of the above-mentioned single battery connection bar. The connection bar size data may include the cross-sectional area data of the battery connection bar and the length data of the battery connection bar.

[0097] In a specific embodiment, the material property information may be used to indicate the material used by the above-mentioned single battery connecting strip.

[0098] In a specific embodiment, the above-mentioned connection bar size data and material property information can be preset and input into the internal resistance measuring device.

[0099] In a specific embodiment, the impedance analysis of the battery connecting bar can be performed based on the cross-sectional area data, the length data and the material property information to obtain the connecting bar impedance data. Specifically, the resistance data of the battery connecting bar and the reactance data of the battery connecting bar can be determined based on the material property information, the cross-sectional area data and the length data; correspondingly, the connecting bar impedance data can be determined based on the resistance data and the reactance data.

[0100] In a specific embodiment, the resistivity data and the corresponding magnetic permeability data corresponding to the battery connecting strip can be determined based on the material property information; the resistance data can be obtained by performing resistance analysis on the battery connecting strip based on the resistivity data, the cross-sectional area data and the length data. The reactance data can be obtained by performing reactance analysis on the battery connecting strip based on the magnetic permeability data, the cross-sectional area data and the length data.

[0101] In a specific embodiment, performing difference analysis on the first internal resistance measurement result and the second internal resistance measurement result based on the connection bar impedance data, the first connection bar number and the second connection bar number to obtain the target internal resistance measurement result may include:

[0102] Performing quantity difference analysis on the quantity of the first connecting strips and the quantity of the second connecting strips to obtain quantity difference data;

[0103] Determining loop difference impedance data based on the quantity difference data and the connection strip impedance data;

[0104] The internal resistance data in the second internal resistance measurement result is subtracted from the internal resistance data in the first internal resistance measurement result, and the loop difference impedance data is subtracted to obtain a target internal resistance measurement result.

[0105] In a specific embodiment, the quantity difference data may be used to characterize the degree of difference between the quantity of the first connecting bars and the quantity of the second connecting bars.

[0106] In a specific embodiment, the absolute value of the difference between the number of the first connecting bars and the number of the second connecting bars may be used as the quantity difference data.

[0107] In a specific embodiment, the loop difference impedance data may represent the degree of difference between the impedance of the battery connection bar included in the first measurement loop and the impedance of the battery connection bar included in the second measurement loop.

[0108] In a specific embodiment, the quantity difference data may be multiplied by the connection bar impedance data to obtain loop difference impedance data.

[0109] In a specific embodiment, the target internal resistance data can be obtained by subtracting the internal resistance data in the first internal resistance measurement result from the internal resistance data in the second internal resistance measurement result and subtracting the loop difference impedance data; accordingly, the target internal resistance measurement result can be generated based on the target internal resistance data.

[0110] In the above embodiment, by combining the number of first connecting bars and the number of second connecting bars, the first internal resistance measurement result and the second internal resistance measurement result are differentially analyzed to obtain the target internal resistance measurement result. This can avoid the influence of the impedance of the control switch on the accuracy of the battery internal resistance measurement result of the target battery, and reduce the influence of the impedance of the battery connecting bars between the series batteries on the accuracy of the battery internal resistance measurement of the target battery, thereby further improving the accuracy of the battery internal resistance measurement of the target battery.

[0111] In a specific embodiment, Figure 4 is a schematic diagram of an internal resistance measurement process according to an exemplary embodiment. Specifically, it is assumed that the internal resistance measurement module includes a plurality of internal resistance measurement units, such as Figure 4 As shown, multiple internal resistance measurement units can be used to simultaneously measure multiple internal resistance measurement results (i.e., corresponding Figure 4 The internal resistance measurement result Z 1 , Z 2 , Z 3 ...Z n ); In combination with the above-mentioned battery internal resistance measurement method, the target internal resistance measurement results corresponding to each of the multiple batteries can be determined based on every two internal resistance measurement results of the above-mentioned multiple internal resistance measurement results. Exemplarily, the internal resistance measurement result Z can be 1 And the internal resistance measurement result Z2 By performing difference analysis, the target internal resistance measurement result of battery 2 can be obtained; the internal resistance measurement result Z 2 And the internal resistance measurement result Z 3 By performing difference analysis, the target internal resistance measurement result of battery 3 can be obtained; and by analogy, the target internal resistance measurement results of battery 2, battery 3, ... battery n can be quickly obtained. It should be noted that Figure 4 This is a simple schematic diagram. The specific connection method of the control switch and the battery connection strip can refer to the above content. Figure 4 The control switch and battery connection strip are omitted and not drawn.

[0112] In the above embodiment, a first internal resistance measurement result and a second internal resistance measurement result are obtained through an internal resistance measurement module, wherein the first internal resistance measurement result is an internal resistance measurement result of at least one battery, and the second internal resistance measurement result is an internal resistance measurement result of multiple batteries, the multiple batteries are at least one battery and a target battery, the number of control switches included in the first measurement loop corresponding to the first internal resistance measurement result is the same as the number of control switches included in the second measurement loop corresponding to the second internal resistance measurement result, the first measurement loop includes at least one battery connected in series, and the second measurement loop includes at least one battery connected in series and a target battery, and the battery internal resistance measurement of the batteries included in the two measurement loops can be realized. Then, the first internal resistance measurement result and the second internal resistance measurement result are analyzed for differences to obtain a target internal resistance measurement result corresponding to the target battery, and on the basis of realizing the battery internal resistance measurement of the target battery, the internal resistance measurement error caused by the control switch in the measurement loop can be eliminated, thereby improving the measurement accuracy of the battery internal resistance.

[0113] Figure 5 is a block diagram of a battery internal resistance measuring device based on an internal resistance measuring device according to an exemplary embodiment. Specifically, Figure 5 As shown, the device may include:

[0114] The measurement result acquisition module 510 may be used to acquire a first internal resistance measurement result and a second internal resistance measurement result based on the internal resistance measurement module; the first internal resistance measurement result is an internal resistance measurement result of at least one battery, the second internal resistance measurement result is an internal resistance measurement result of multiple batteries, the multiple batteries are at least one battery and a target battery, the number of control switches included in the first measurement loop corresponding to the first internal resistance measurement result is the same as the number of control switches included in the second measurement loop corresponding to the second internal resistance measurement result; the first measurement loop includes at least one battery connected in series, and the second measurement loop includes at least one battery connected in series and a target battery;

[0115] The difference analysis module 520 may be used to perform a difference analysis on the first internal resistance measurement result and the second internal resistance measurement result to obtain a target internal resistance measurement result corresponding to the target battery.

[0116] In a specific embodiment, the above device may further include:

[0117] A connection bar quantity acquisition module can be used to acquire the number of first connection bars corresponding to the first measurement loop and the number of second connection bars corresponding to the second measurement loop; the number of first connection bars is the number of battery connection bars included in the first measurement loop, and the number of second connection bars is the number of battery connection bars included in the second measurement loop, and the battery connection bar is used to realize the series connection between two batteries by connecting two battery terminals;

[0118] Accordingly, the difference analysis module 520 may include:

[0119] The first difference analysis module can be used to perform difference analysis on the first internal resistance measurement result and the second internal resistance measurement result based on the first connection bar quantity and the second connection bar quantity to obtain a target internal resistance measurement result.

[0120] In a specific embodiment, the first difference analysis module may include:

[0121] The second difference analysis module can be used to perform internal resistance data difference analysis on the first internal resistance measurement result and the second internal resistance measurement result to obtain a target internal resistance measurement result when the number of the first connecting bars and the number of the second connecting bars are equal.

[0122] In a specific embodiment, the above device may further include:

[0123] The impedance data acquisition module can be used to acquire the connection bar impedance data of the battery connection bar; the connection bar impedance data represents the impedance of a single battery connection bar;

[0124] Accordingly, the first difference analysis module may include:

[0125] The third difference analysis module can be used to perform difference analysis on the first internal resistance measurement result and the second internal resistance measurement result based on the connection bar impedance data, the first connection bar number and the second connection bar number to obtain the target internal resistance measurement result when the first connection bar number and the second connection bar number are not equal.

[0126] In a specific embodiment, the third difference analysis module may include:

[0127] The quantity difference analysis module can be used to perform quantity difference analysis on the quantity of the first connecting strips and the quantity of the second connecting strips to obtain quantity difference data; the quantity difference data is used to characterize the degree of difference between the quantity of the first connecting strips and the quantity of the second connecting strips;

[0128] The impedance data determination module can be used to determine loop difference impedance data based on the quantity difference data and the connection bar impedance data; the loop difference impedance data represents the difference between the impedance of the battery connection bar included in the first measurement loop and the impedance of the battery connection bar included in the second measurement loop;

[0129] The measurement result generating module can be used to subtract the internal resistance data in the first internal resistance measurement result from the internal resistance data in the second internal resistance measurement result, and subtract the loop difference impedance data to obtain a target internal resistance measurement result.

[0130] In a specific embodiment, the above device may further include:

[0131] A connection bar property acquisition module can be used to obtain connection bar size data corresponding to the battery connection bar and material property information corresponding to the battery connection bar;

[0132] The impedance analysis module can be used to perform impedance analysis on the battery connecting bar based on the connecting bar size data and material property information to obtain the connecting bar impedance data.

[0133] In a specific embodiment, the internal resistance measuring device further includes a switch control module; the above device may further include:

[0134] A first execution module may be used to control at least one first control switch to be closed based on the switch control module; the at least one first control switch is a control switch included in the first measurement loop;

[0135] The first measurement module can be used to measure the internal resistance of the first measurement loop based on the internal resistance measurement module when at least one first control switch is closed, so as to obtain a first internal resistance measurement result.

[0136] In a specific embodiment, the internal resistance measuring device further includes a switch control module; the above device may further include:

[0137] The second execution module may be used to control at least one second control switch to be closed based on the switch control module; the at least one second control switch is a control switch included in the second measurement loop;

[0138] The second measurement module can be used to measure the internal resistance of the second measurement loop based on the internal resistance measurement module when at least one second control switch is closed, so as to obtain a second internal resistance measurement result.

[0139] In a specific embodiment, the switch configuration information of the control switch in the first measurement loop is the same as the switch configuration information of the control switch in the second measurement loop.

[0140] Regarding the device in the above embodiment, the specific manner in which each module and unit performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0141] Figure 6 is a block diagram of an electronic device for measuring the internal resistance of a target battery according to an exemplary embodiment. The electronic device may be a server, and its internal structure diagram may be as shown in FIG. Figure 6 As shown. The electronic device includes a processor, a memory and a network interface connected via a system bus. The processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic 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 the computer program in the non-volatile storage medium. The network interface of the electronic device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a battery internal resistance measurement method based on an internal resistance measurement device is implemented.

[0142] Figure 7 is a block diagram of another electronic device for measuring the internal resistance of a target battery according to an exemplary embodiment. The electronic device may be a terminal, and its internal structure diagram may be as shown in FIG. Figure 7 As shown. The electronic device includes a processor, a memory, a network interface, a display screen and an input device connected through a system bus. Among them, the processor of the electronic device is used to provide computing and control capabilities. The memory of the electronic 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 the computer program in the non-volatile storage medium. The network interface of the electronic device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a battery internal resistance measurement method based on an internal resistance measurement device is implemented. The display screen of the electronic device can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic device can be a touch layer covered on the display screen, or a button, trackball or touchpad set on the housing of the electronic device, or an external keyboard, touchpad or mouse, etc.

[0143] Those skilled in the art will understand that Figure 6 or Figure 7The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present disclosure, and does not constitute a limitation on the electronic device to which the scheme of the present disclosure is applied. The specific electronic device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0144] In an exemplary embodiment, an electronic device is also provided, including: a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to execute the instructions to implement a battery internal resistance measurement method based on an internal resistance measurement device as in an embodiment of the present disclosure.

[0145] In an exemplary embodiment, a computer-readable storage medium is also provided. When instructions in the storage medium are executed by a processor of an electronic device, the electronic device can execute the battery internal resistance measurement method based on the internal resistance measurement device in the embodiment of the present disclosure.

[0146] In an exemplary embodiment, a computer program product containing instructions is also provided. When the computer program product is executed on a computer, the computer is enabled to execute the battery internal resistance measuring method based on the internal resistance measuring device in the embodiment of the present disclosure.

[0147] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0148] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0149] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A battery internal resistance measurement method based on an internal resistance measurement device, characterized in that: The internal resistance measuring device comprises an internal resistance measuring module, and the method comprises: Based on the internal resistance measurement module, a first internal resistance measurement result and a second internal resistance measurement result are obtained; the first internal resistance measurement result is an internal resistance measurement result of at least one battery, the second internal resistance measurement result is an internal resistance measurement result of multiple batteries, the multiple batteries are the at least one battery and a target battery, the number of control switches included in a first measurement loop corresponding to the first internal resistance measurement result is the same as the number of control switches included in a second measurement loop corresponding to the second internal resistance measurement result; the first measurement loop includes the at least one battery connected in series, and the second measurement loop includes the at least one battery and the target battery connected in series; the switch configuration information of the control switch in the first measurement loop is the same as the switch configuration information of the control switch in the second measurement loop; Performing difference analysis on the first internal resistance measurement result and the second internal resistance measurement result to obtain a target internal resistance measurement result corresponding to the target battery; The method further comprises: Obtaining the number of first connecting bars corresponding to the first measurement loop, the number of second connecting bars corresponding to the second measurement loop, and connecting bar impedance data of the battery connecting bars; the first connecting bar number is the number of battery connecting bars included in the first measurement loop, the second connecting bar number is the number of battery connecting bars included in the second measurement loop, the battery connecting bar is used to realize series connection between two batteries by connecting two battery terminals; the connecting bar impedance data represents the impedance of a single battery connecting bar; The performing difference analysis on the first internal resistance measurement result and the second internal resistance measurement result to obtain a target internal resistance measurement result corresponding to the target battery includes: Based on the first number of connecting bars and the second number of connecting bars, performing a difference analysis on the first internal resistance measurement result and the second internal resistance measurement result to obtain the target internal resistance measurement result, including: when the first number of connecting bars and the second number of connecting bars are equal, subtracting the first internal resistance data in the first internal resistance measurement result from the second internal resistance data in the second internal resistance measurement result to obtain the target internal resistance measurement result; when the first number of connecting bars and the second number of connecting bars are not equal, performing a difference analysis on the first internal resistance measurement result and the second internal resistance measurement result based on the connecting bar impedance data, the first number of connecting bars, and the second number of connecting bars to obtain the target internal resistance measurement result; The method of performing a difference analysis on the first internal resistance measurement result and the second internal resistance measurement result based on the connection bar impedance data, the first connection bar quantity and the second connection bar quantity to obtain the target internal resistance measurement result includes: performing a quantity difference analysis on the first connection bar quantity and the second connection bar quantity to obtain quantity difference data; the quantity difference data is used to characterize the degree of difference between the first connection bar quantity and the second connection bar quantity; determining loop difference impedance data based on the quantity difference data and the connection bar impedance data; the loop difference impedance data characterizes the degree of difference between the impedance of the battery connection bar included in the first measurement loop and the impedance of the battery connection bar included in the second measurement loop; subtracting the internal resistance data in the first internal resistance measurement result from the internal resistance data in the second internal resistance measurement result, and subtracting the loop difference impedance data to obtain the target internal resistance measurement result.

2. The method according to claim 1, characterized in that The connecting strip impedance data is obtained by: Acquire connection bar size data corresponding to the battery connection bar and material property information corresponding to the battery connection bar; Based on the connecting bar size data and the material property information, impedance analysis is performed on the battery connecting bar to obtain the connecting bar impedance data.

3. The method according to claim 1, characterized in that The internal resistance measurement device further includes a switch control module; the first internal resistance measurement result is obtained by: Based on the switch control module, controlling at least one first control switch to be closed; the at least one first control switch is a control switch included in the first measurement loop; When the at least one first control switch is closed, the internal resistance of the first measurement loop is measured based on the internal resistance measurement module to obtain the first internal resistance measurement result.

4. The method according to claim 1, characterized in that: The internal resistance measurement device further includes a switch control module; the second internal resistance measurement result includes obtaining the following method: Based on the switch control module, controlling at least one second control switch to be closed; the at least one second control switch is a control switch included in the second measurement loop; When the at least one second control switch is closed, the internal resistance of the second measurement loop is measured based on the internal resistance measurement module to obtain the second internal resistance measurement result.

5. A battery internal resistance measuring device based on an internal resistance measuring device, characterized in that: The device is used to implement the battery internal resistance measurement method based on the internal resistance measurement device according to any one of claims 1 to 4, and the device includes: a measurement result acquisition module, configured to acquire a first internal resistance measurement result and a second internal resistance measurement result based on the internal resistance measurement module; the first internal resistance measurement result is an internal resistance measurement result of at least one battery, the second internal resistance measurement result is an internal resistance measurement result of multiple batteries, the multiple batteries are the at least one battery and a target battery, the number of control switches included in a first measurement loop corresponding to the first internal resistance measurement result is the same as the number of control switches included in a second measurement loop corresponding to the second internal resistance measurement result; the first measurement loop includes the at least one battery connected in series, and the second measurement loop includes the at least one battery and the target battery connected in series; The difference analysis module is used to perform a difference analysis on the first internal resistance measurement result and the second internal resistance measurement result to obtain a target internal resistance measurement result corresponding to the target battery.

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