CN112578299A - Method and device for determining internal metal structure fracture of storage battery - Google Patents
Method and device for determining internal metal structure fracture of storage battery Download PDFInfo
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- 239000002184 metal Substances 0.000 title claims abstract description 71
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- 239000003990 capacitor Substances 0.000 claims abstract description 83
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
Abstract
The application relates to a method and a device for determining internal metal structure fracture of a storage battery. The method comprises the following steps: acquiring an actual polarization capacitor, wherein the actual polarization capacitor is the polarization capacitance value of the storage battery to be tested under the conditions that the electric quantity is Q and the voltage is U; and judging whether the internal metal structure of the storage battery to be tested is broken or not according to the error between the actual polarization capacitor and the reference polarization capacitor and the standard polarization capacitor. The method comprises the steps of detecting the polarization capacitance of a storage battery to be detected under the condition that the electric quantity is Q and the voltage is U to obtain the actual polarization capacitance, comparing the actual polarization capacitance with the polarization capacitance data of a reference storage battery with the same specification under the same condition, namely comparing the actual polarization capacitance with the reference polarization capacitance and the standard polarization capacitance of the reference storage battery, and judging whether the storage battery to be detected has the condition that an internal metal structure is broken or not, namely judging whether tabs or busbars are broken off or not.
Description
Technical Field
The application relates to the technical field of storage battery detection, in particular to a method and a device for determining internal metal structure fracture of a storage battery.
Background
At present, lead-acid storage batteries are widely used in fields such as electric direct-current Power systems, communication Power supplies, computer room UPSs (Uninterruptible Power supplies), new energy storage Power stations and the like, and are an important work for storage battery detection, management and maintenance. Wherein, the fracture of utmost point ear or the fracture of busbar are one of the main trouble of battery.
At present, whether the lugs or the bus bars of the storage battery are broken or not is mainly detected by manually using an optical endoscope, although the method has certain effectiveness, whether the lugs or the bus bars of the parts shielded by the activating substances of the storage battery are broken or not can not be detected, and the manual detection method by using the optical endoscope is not suitable for the detection of the storage battery running on line in a large scale.
Disclosure of Invention
In view of the above, it is necessary to provide a method and an apparatus for determining whether or not an internal metal structure of a battery is broken, which can determine whether or not the internal metal structure of the battery is broken.
In a first aspect, a method for determining internal metal structure fracture of a storage battery is provided, which includes:
acquiring an actual polarization capacitor, wherein the actual polarization capacitor is the polarization capacitance value of the storage battery to be tested under the conditions that the electric quantity is Q and the voltage is U;
and judging whether the internal metal structure of the storage battery to be tested is broken or not according to the error between the actual polarization capacitor and the reference capacitor and a standard polarization capacitor, wherein the reference polarization capacitor is a polarization capacitance value of a reference storage battery under the conditions that the electric quantity is Q and the voltage is U, the standard polarization capacitor is a polarization capacitance value of a single cell of the reference storage battery, and the storage battery to be tested and the reference storage battery are storage batteries with the same specification.
In one embodiment, the determining whether the internal metal structure of the battery to be tested is broken includes:
calculating a difference between the actual polarization capacitance and the reference polarization capacitance;
and comparing the absolute value of the difference with the standard polarization capacitor, and if the absolute value is greater than or equal to the standard polarization capacitor, judging that the internal metal structure of the storage battery to be tested is broken.
In one embodiment, the obtaining the actual polarization capacitance includes:
charging the storage battery to be tested, and stopping charging when the electric quantity of the storage battery to be tested is Q;
and under the condition that the voltage is U, measuring the polarization capacitance value of the storage battery to be tested as the actual polarization capacitance.
In one embodiment, the electric quantity Q of the battery to be tested is a corresponding electric quantity value when the battery to be tested is fully charged.
In one embodiment, the method for determining the internal metal structure fracture of the storage battery further comprises:
charging the reference storage battery, and stopping charging when the electric quantity of the storage battery is Q;
in the case of a voltage U, the polarization capacitance value of the reference battery is measured as the reference polarization capacitance.
In one embodiment, the method for determining the internal metal structure fracture of the storage battery further comprises:
calculating a quotient of the reference polarization capacitance and a number n of battery cells of a reference battery;
the sum of the quotient and the error coefficient is taken as the standard polarization capacitance.
In one embodiment, the battery cells of the battery under test are connected in parallel.
In one embodiment, the step of obtaining the actual polarization capacitance includes measuring the actual polarization capacitance of the battery to be tested by a dual-frequency point battery testing device.
In one embodiment, the method for determining the internal metal structure fracture of the storage battery further comprises:
and calculating the number k of the battery unit cells with broken internal metal structures of the storage battery to be tested according to the difference between the actual polarization capacitor and the reference polarization capacitor and the standard polarization capacitor.
In a second aspect, there is provided an apparatus for determining breakage of an internal metal structure of a secondary battery, comprising:
the storage battery detection module is connected with the storage battery to be detected and used for measuring the polarization capacitance value of the storage battery to be detected under the conditions that the electric quantity is Q and the voltage is U and taking the polarization capacitance value of the storage battery to be detected as an actual polarization capacitance;
and the judging module is connected with the storage battery detecting module and is used for judging whether the storage battery to be detected has the condition of internal metal structure fracture according to the error between the actual polarization capacitor and the reference polarization capacitor and the standard polarization capacitor, the reference polarization capacitor is the polarization capacitance value of the reference storage battery under the conditions that the electric quantity is Q and the voltage is U, the standard polarization capacitor is the polarization capacitance value of a single cell of the reference storage battery, and the storage battery to be detected and the reference storage battery are storage batteries with the same specification.
In one embodiment, the determining module comprises:
the calculation module is connected with the storage battery detection module and used for acquiring the actual polarization capacitor and calculating the difference between the actual polarization capacitor and the reference polarization capacitor;
and the comparison module is connected with the calculation module and used for acquiring the absolute value of the difference, comparing the absolute value with a standard polarization capacitor, and judging that the storage battery to be tested has the condition of internal metal structure fracture if the absolute value is greater than or equal to the standard polarization capacitor.
In a third aspect, a computer device is provided, comprising a memory and a processor, the memory storing a computer program, the computer program when executed by the processor implementing the method for determining a fracture in an internal metal structure of a battery as defined in any one of the first to third aspects.
In a fourth aspect, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method for determining internal metal structure fracture of a battery as defined in any one of the first to third aspects above.
According to the determination method, the determination device, the computer equipment and the computer readable storage medium for determining the internal metal structure fracture of the storage battery, the polarization capacitance of the storage battery to be tested under the conditions that the electric quantity is Q and the voltage is U is detected to obtain the actual polarization capacitance, and then the actual polarization capacitance is compared with the polarization capacitance data of the reference storage battery with the same specification under the same condition, namely the actual polarization capacitance is compared with the reference polarization capacitance and the standard polarization capacitance of the reference storage battery, so that whether the internal metal structure fracture condition of the storage battery to be tested exists or not is judged, namely whether the tab or the busbar is subjected to falling fracture or not is judged.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view showing an internal structure of a secondary battery according to an embodiment;
FIG. 2 is a schematic flow chart of a method for determining internal metal structure fracture of a battery according to one embodiment;
FIG. 3 is a flow diagram illustrating the sub-steps of step S204 in one embodiment;
FIG. 4 is an internal structural equivalent model of a secondary battery in one embodiment;
FIG. 5 is a block diagram showing a structure of a device for determining breakage of an internal metal structure of a secondary battery in one embodiment;
fig. 6 is a block diagram showing a structure of a device for determining breakage of an internal metal structure of a secondary battery in another embodiment.
Description of reference numerals:
100-positive post, 102-negative post, 104-positive bus, 106-negative bus, 108-positive tab, 110-negative tab, 112-positive tab, 114-negative tab, 116-separator and chemical substance, 500-determination of internal metal structure fracture of battery, 502-battery detection module, 504-determination module, 602-calculation module, 604-comparison module
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
Spatial relational terms, such as "under," "below," "under," "over," and the like may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
The storage battery is a device for directly converting chemical energy into electric energy, realizes recharging through reversible chemical reaction, utilizes external electric energy to regenerate internal active substances when the storage battery is charged, stores the electric energy into the chemical energy, and converts the chemical energy into the electric energy again to output when the storage battery needs to discharge.
As described in the background, manual inspection with an optical endoscope is disadvantageous because of the presence of internal active substances in the battery.
The method for determining the internal metal structure fracture of the storage battery can be applied to the storage battery. As shown in fig. 1, the internal structure of the battery includes a positive post 100, a negative post 102, a positive busbar 104, a negative busbar 106, a positive tab 108, a negative tab 110, a positive plate 112, a negative plate 114, a separator, and a chemical substance 116, wherein each positive plate 112 is connected to the positive busbar 104 through one positive tab 108, each negative plate 114 is connected to the negative busbar 104 through one negative tab 110, and a pair of the positive plate 112 and the negative plate 114 form a basic battery cell, and the battery is formed by a plurality of basic battery cells. Optionally, the battery is a lead-acid battery.
In one embodiment, as shown in fig. 2, there is provided a method of determining breakage of an internal metal structure of a secondary battery, including:
s202, acquiring an actual polarization capacitor, wherein the actual polarization capacitor is the polarization capacitance value of the storage battery to be tested under the conditions that the electric quantity is Q and the voltage is U.
Specifically, the storage battery to be detected is the storage battery which needs to be detected whether the internal metal structure is broken or not. It should be noted that the electric quantity Q should be smaller than the electric quantity value corresponding to the full electric quantity of the storage battery to be measured, and the voltage U should enable the storage battery to work normally, i.e. not to destroy the structure of the storage battery.
And S204, judging whether the internal metal structure of the storage battery to be tested is broken or not according to the error between the actual polarization capacitor and the reference capacitor and the standard polarization capacitor, wherein the reference polarization capacitor is the polarization capacitance value of the reference storage battery under the conditions that the electric quantity is Q and the voltage is U, the standard polarization capacitor is the polarization capacitance value of a single cell of the reference storage battery, and the storage battery to be tested and the reference storage battery are storage batteries with the same specification.
Specifically, the internal metal structure of the storage battery comprises a tab and a bus bar. The reference battery is a battery without internal metal structure fracture, and in an alternative embodiment of the present application, the reference battery is a completely new battery. It should be noted that the storage battery to be tested and the reference storage battery are the same in specification, which means that the number of battery cells, the type and the characteristics of the storage battery, the rated capacity and the special performance of the storage battery to be tested and the reference storage battery are the same, wherein the type of the storage battery comprises a starting storage battery, a motorcycle storage battery, a ship storage battery, an airplane storage battery and the like, the characteristics of the storage battery comprise a dry-sealed common lead storage battery, a dry-charged storage battery, a thin polar plate, disorder maintenance and the like, and the special performance of the storage battery comprises a high-starting-rate storage battery, a plastic shell, a low-.
According to the method for determining the internal metal structure fracture of the storage battery, the polarization capacitor of the storage battery to be tested under the conditions that the electric quantity is Q and the voltage is U is detected, the actual polarization capacitor is obtained, the actual polarization capacitor is compared with the polarization capacitor data of the reference storage battery with the same specification under the same condition, namely the actual polarization capacitor is compared with the reference polarization capacitor and the standard polarization capacitor of the reference storage battery, so that whether the internal metal structure fracture exists in the storage battery to be tested is judged, and whether tab or busbar falling fracture exists is judged.
As described in the foregoing embodiment, if it is determined whether the internal metal structure of the battery to be tested is broken according to the error between the actual polarization capacitor and the reference polarization capacitor, the following embodiments provide a method for obtaining the actual polarization capacitor and the reference polarization capacitor.
First, in an alternative embodiment of the present application, a method for obtaining an actual polarization capacitance is provided, and based on the embodiment shown in fig. 2, specifically, before S202, the method includes:
s302: and charging the storage battery to be tested, and stopping charging when the electric quantity of the storage battery to be tested is Q.
S304: and under the condition that the voltage is U, measuring the polarization capacitance value of the storage battery to be measured as an actual polarization capacitance.
While the above embodiments provide a method of obtaining the actual polarization capacitance, the following embodiments provide a method of obtaining the reference polarization capacitance. Specifically, the method comprises the following steps:
s402: and charging the reference storage battery, and stopping charging when the electric quantity of the reference storage battery is Q.
S404: in the case of a voltage U, the polarization capacitance value of the reference battery is measured as the reference polarization capacitance.
It should be noted that the actual polarization capacitor and the reference polarization capacitor should be the capacitance values of the same size battery measured at the same power level and the same voltage level.
In an optional embodiment of the present application, the storage battery to be tested and the reference storage battery are completely discharged, and then the storage battery to be tested and the reference storage battery are charged for the same time under the same environmental conditions, i.e., under the same environmental conditions of temperature, power supply voltage, and the like, so as to obtain the storage battery to be tested and the reference storage battery with the electric quantity of Q. Preferably, the electric quantity Q is an electric quantity value corresponding to the full electric quantity of the storage battery to be tested, and it should be understood that the electric quantity Q is also an electric quantity value corresponding to the full electric quantity of the reference storage battery. The corresponding electric quantity value when adopting full electric quantity is as electric quantity Q, does not need to control conditions such as charging time and charging environment, also can guarantee that the battery that awaits measuring is the same with reference battery electric quantity, so the electric quantity value that corresponds when adopting the battery that awaits measuring full electric quantity realizes the purpose of this embodiment for electric quantity Q more easily. In another optional embodiment of the present application, the electric quantities of the battery to be tested and the reference battery are detected by the battery capacity analyzer, and the battery to be tested and the reference battery are subjected to corresponding charging or discharging processes, so as to obtain the battery to be tested and the reference battery with the electric quantity Q. The method for acquiring the storage battery to be tested and the reference storage battery with the electric quantity Q is not limited in the application.
In an alternative embodiment of the present application, the reference polarization capacitance and the standard polarization capacitance are measured by a dual frequency point battery test device.
Optionally, the reference polarization capacitance and the standard polarization capacitance are measured using a pit 3919 battery capacity tester. The PITE3919 adopts a multi-frequency point testing technology, and can accurately test the storage battery characteristic parameters such as electrode double-layer capacitance and the like.
It should be noted that, in practical application, the detection of the storage battery to be detected may be performed many times, and for the detection of the same storage battery to be detected or the storage batteries of the same specification, the same reference storage battery may be used, that is, the reference polarization capacitor only needs to be obtained once, and is not needed to be obtained during each detection, so that the detection operation is simplified.
As described in the above embodiment, the following embodiments will provide a method for determining whether there is a fracture of the internal metal structure in the battery to be tested according to the error between the actual polarization capacitance and the reference polarization capacitance and the standard polarization capacitance.
FIG. 3 is a flow diagram illustrating the sub-steps of step S204 in one embodiment. Based on the embodiment shown in fig. 2, specifically, step S204 includes:
s502: the difference between the actual polarization capacitance and the reference polarization capacitance is calculated.
S504: and comparing the absolute value of the difference with the standard polarization capacitor, and judging that the internal metal structure of the storage battery to be tested is broken if the absolute value is greater than or equal to the standard polarization capacitor.
Specifically, when the difference between the actual polarization capacitance and the reference polarization capacitance is equal to the standard polarization capacitance, it indicates that the actual polarization capacitance is the same as the reference polarization capacitance, that is, the battery to be tested is the same as the reference battery, and because the reference battery is a battery without internal metal structure fracture, the battery to be tested does not have internal metal structure fracture.
When the difference between the actual polarization capacitor and the reference polarization capacitor is smaller than the standard polarization capacitor, it may be an error caused by a measurement device, or an error caused by a difference in manufacturing of the battery of the same specification, and the difference between the actual polarization capacitor and the reference polarization capacitor caused by measurement or manufacturing is not equal to the standard polarization capacitor, and should not be considered as representing that the internal metal structure of the battery to be tested is broken.
When the difference between the actual polarization capacitance and the reference polarization capacitance is greater than or equal to the standard polarization capacitance, it can be considered that the number of the battery cells connected in parallel is reduced due to the breakage of the metal structure, i.e., the tab or the bus bar, inside the storage battery, so that the condition that the metal structure inside the storage battery is broken can be judged.
According to the judgment method, the difference between the actual polarization capacitor and the reference polarization capacitor is compared with the standard polarization capacitor, so that errors caused by inaccurate manufacturing or measurement are eliminated, and whether the internal metal structure of the storage battery is broken or not is judged more accurately.
In an alternative embodiment of the present application, the battery is formed by connecting a plurality of basic battery cells in parallel. Fig. 4 shows an internal structural equivalent model of the storage battery, which includes positive and negative ohmic internal resistances R1iPolarization capacitance C2iPolarization resistance R2i，i＝1，2，……，n。
Specifically, the polarization capacitor is an electric double layer capacitor formed by positive and negative electrode plates of battery cells connected in parallel in the storage battery and dielectric substances between the positive and negative electrode plates.
Since the battery is composed of parallel-connected battery cells, the total equivalent polarization capacitance C2 of the battery is:
C2＝C21+C22+C23+…+C2n
typically, the individual cells within the battery are uniform, i.e., C21＝C22＝…＝C2n
The total equivalent polarization capacitance C2 of the battery is therefore:
C2＝n*C21
where n is the number of cells of the reference battery.
Optionally, the total equivalent polarization capacitance C2 value of the storage battery to be tested under the condition of the specified voltage level U of the storage battery in the fully charged state is measured by the dual-frequency point storage battery detection device, and is used as the actual polarization capacitance of the storage battery to be tested.
Further, after the new battery is fully charged, under the condition of a specified voltage level U, the total equivalent polarization capacitance C2' value of the new battery is measured through the double-frequency-point storage battery detection equipment and is used as the reference polarization capacitance of the reference storage battery.
The standard polarization capacitance of each battery cell
Where d is the error coefficient.
Optionally, d is 0, i.e. the standard polarization capacitance of the cell is
Preferably, d is not 0 and the standard polarization capacitance of the battery cell is
The above-described embodiments take into account the non-uniformity of the plurality of cells of the reference storage battery due to the manufacturing process, and more accurately express the standard polarization capacitance.
The actual polarization capacitance C2 is compared to the reference polarization capacitance C2' and, optionally,
C2-C2′＝△C2
if delta C2 is more than or equal to C2'1
The internal metal structure of the battery to be tested is broken, that is, the tabs and/or the bus bars are broken.
The embodiment provides a condition for judging whether the internal metal structure of the storage battery is broken, and the application also provides a method for judging the number of the broken battery unit cells of the internal metal structure of the storage battery to be tested.
Specifically, the number of the battery unit cells with broken internal metal structures of the storage battery to be tested is calculated according to the difference between the actual polarization capacitor and the reference polarization capacitor and the standard polarization capacitor.
In an alternative embodiment of the present application, the number of battery cells with internal metal structure fracture of the battery to be tested is k, then
Where Δ C2 is the difference between the actual polarization capacitance and the reference polarization capacitance, C2'1And n is the cell number of the reference storage battery.
It should be understood that although the various steps in the flow diagrams of fig. 2-3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a portion of the steps of fig. 2-3 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
In one embodiment, as shown in fig. 5, there is provided a device 500 for determining breakage of an internal metal structure of a secondary battery, including: battery detection module 502 and judgement module 504, wherein:
the battery detection module 502 is connected with the battery to be measured, and is used for measuring the polarization capacitance value of the battery to be measured under the condition that the electric quantity is Q and the voltage is U, and taking the polarization capacitance value of the battery to be measured as the actual polarization capacitance.
The judgment module 504 is connected to the storage battery detection module 502, and is configured to judge whether there is a fracture condition of the internal metal mechanism in the storage battery to be detected according to an error between the actual polarization capacitance and the reference polarization capacitance and the standard polarization capacitance. The reference polarization capacitor is a polarization capacitance value of a reference storage battery under the conditions that the electric quantity is Q and the voltage is U, the standard polarization capacitor is a polarization capacitance value of a single cell of the reference storage battery, and the storage battery to be tested and the reference storage battery are storage batteries with the same specification.
In an alternative embodiment of the present application, as shown in FIG. 6, the determining module comprises a calculating module 602 and a comparing module 604, wherein
The calculation module 602 is connected to the battery detection module 502, and is configured to obtain an actual polarization capacitance and calculate a difference between the actual polarization capacitance and a reference polarization capacitance.
Optionally, the storage battery detection module 502 is further connected to a reference storage battery, and is configured to measure a polarization capacitance value of the reference storage battery under the condition that the electric quantity is Q and the voltage is U, and use the polarization capacitance value of the reference storage battery as a reference polarization capacitance, and the calculation module 602 obtains the reference polarization capacitance to calculate a difference between the actual polarization capacitance and the reference polarization capacitance.
In another embodiment of the present application, the reference polarization capacitance is stored in the calculation module, and when the calculation operation is needed, the reference polarization capacitance is retrieved for calculation.
The comparison module 604 is connected to the calculation module 602, and configured to obtain an absolute value of the difference calculated by the calculation module 602, compare the absolute value with the standard polarization capacitance, and determine that the internal metal structure of the battery to be tested is broken when the absolute value is greater than or equal to the standard polarization capacitance.
In an alternative embodiment of the present application, the calculation module is further configured to calculate a quotient of the reference polarization capacitance and the number n of battery cells of the reference battery, and to use the sum of the quotient and the error coefficient as the standard polarization capacitance.
It should be noted that since the reference storage battery is a certain storage battery, the number of battery cells thereof can be determined.
In an optional embodiment of the present application, the calculation module is further configured to calculate the number k of the battery cells with broken internal metal structures of the battery to be tested according to a difference between the actual polarization capacitance and the reference polarization capacitance and the standard polarization capacitance. Alternatively to this, the first and second parts may,
where Δ C2 is the difference between the actual polarization capacitance and the reference polarization capacitance, C2'1And n is the cell number of the reference storage battery.
The specific definition of the determination device for determining the internal metal structure fracture of the storage battery can be referred to the above definition of the determination method for determining the internal metal structure fracture of the storage battery, and is not described herein again. The respective modules in the above-described device for determining the internal metal structure fracture of the secondary battery may be wholly or partially implemented by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
In one embodiment, a computer device is further provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for determining internal metal structure fracture of a battery, the method comprising:
acquiring an actual polarization capacitor, wherein the actual polarization capacitor is the polarization capacitance value of the storage battery to be tested under the conditions that the electric quantity is Q and the voltage is U;
and judging whether the storage battery to be tested has the condition of internal metal structure fracture according to the error between the actual polarization capacitor and the reference polarization capacitor and the standard polarization capacitor, wherein the reference polarization capacitor is the polarization capacitance value of the reference storage battery under the conditions that the electric quantity is Q and the voltage is U, the standard polarization capacitor is the polarization capacitance value of a single cell of the reference storage battery, and the storage battery to be tested and the reference storage battery are storage batteries with the same specification.
2. The method for determining internal metal structure fracture of the storage battery according to claim 1, wherein the step of judging whether the internal metal structure fracture exists in the storage battery to be tested comprises the following steps:
calculating a difference between the actual polarization capacitance and the reference polarization capacitance;
and comparing the absolute value of the difference with the standard polarization capacitor, and if the absolute value is greater than or equal to the standard polarization capacitor, judging that the internal metal structure of the storage battery to be tested is broken.
3. The method for determining internal metal structure fracture of storage battery according to claim 1, characterized in that said obtaining actual polarization capacitance comprises:
charging the storage battery to be tested, and stopping charging when the electric quantity of the storage battery to be tested is Q;
and under the condition that the voltage is U, measuring the polarization capacitance value of the storage battery to be measured as the actual polarization capacitance.
4. The method for determining the internal metal structure fracture of the storage battery as claimed in claim 3, wherein the electric quantity Q of the storage battery to be tested is an electric quantity value corresponding to the full electric quantity of the storage battery to be tested.
5. The method for determining internal metal structure fracture of secondary battery according to claim 1, characterized in that said method further comprises:
charging the reference storage battery, and stopping charging when the electric quantity of the reference storage battery is Q;
and measuring the polarization capacitance value of the reference storage battery as the reference polarization capacitance under the condition that the voltage is U.
6. The method for determining internal metal structure fracture of secondary battery according to claim 5, characterized in that said method further comprises:
calculating a quotient of the reference polarization capacitance and a number n of battery cells of a reference battery;
and taking the sum of the quotient and the error coefficient as the standard polarization capacitance.
7. The method for determining internal metal structure fracture of storage battery according to claim 1, characterized in that each cell of the storage battery to be tested is connected in parallel.
8. The method for determining internal metal structure fracture of storage battery according to claim 1, characterized in that said step of obtaining actual polarization capacitance comprises measuring actual polarization capacitance of said storage battery under test by a dual-frequency point storage battery test equipment.
9. The method for determining internal metal structure fracture of secondary battery according to any of claims 1-8, characterized in that said method further comprises:
and calculating the number k of the broken battery unit cells of the internal metal structure of the storage battery to be tested according to the difference between the actual polarization capacitor and the reference polarization capacitor and the standard polarization capacitor.
10. An apparatus for determining internal metal structure fracture of a battery, comprising:
the storage battery detection module is connected with the storage battery to be detected and used for measuring the polarization capacitance value of the storage battery to be detected under the conditions that the electric quantity is Q and the voltage is U and taking the polarization capacitance value of the storage battery to be detected as an actual polarization capacitance;
the judgment module is connected with the storage battery detection module and used for judging whether the storage battery to be detected has the broken condition of an internal metal structure according to the error between the actual polarization capacitor and the reference polarization capacitor and the standard polarization capacitor, wherein the reference polarization capacitor is the polarization capacitance value of the reference storage battery under the conditions that the electric quantity is Q and the voltage is U, the standard polarization capacitor is the polarization capacitance value of a single cell of the reference storage battery, and the storage battery to be detected and the reference storage battery are storage batteries with the same specification.
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