CN115871512A - Battery detection and battery charging control method, device, equipment and medium - Google Patents
Battery detection and battery charging control method, device, equipment and medium Download PDFInfo
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- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
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Abstract
The disclosure relates to a battery detection and battery charging control method, device, equipment and medium. The battery detection method comprises the following steps: detecting the reference potential of the battery anode of the target calibration battery relative to the reference electrode, wherein the target calibration battery has target battery state parameters; detecting the direct current impedance of the target calibration battery in the process of charging the target calibration battery; and calculating the maximum charging current of the target calibration battery according to the reference potential and the direct current impedance. According to the embodiment of the disclosure, the maximum charging current of the battery can be rapidly detected without disassembling the battery, and powerful data support is provided for the safe application of the battery system.
Description
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a method, an apparatus, a device, and a medium for battery detection and battery charging control.
Background
With the development of vehicle technology, electric vehicles are widely favored by users by virtue of the advantages of energy conservation, pollution reduction and the like.
The power source of the electric automobile is a battery, and the battery needs to be charged in a charging pile to provide driving force for the electric automobile. In the process that the electric automobile is charged through the quick charging pile, if the quick charging pile is abnormal or a new vehicle is connected into the quick charging pile, the electric automobile can be impacted by abnormal large current, and safety risk is caused to a battery system of the electric automobile. Therefore, it is necessary to accurately determine the maximum charging capacity that the battery can bear. In order to accelerate the evaluation speed and improve the experimental efficiency, the maximum bearable charging capacity of the battery is generally studied and analyzed visually by disassembling the battery in different test states, but the disassembly of the battery can cause irreversible damage to the battery, so that the detection cost is high.
Disclosure of Invention
In order to solve the technical problems or at least partially solve the technical problems, the present disclosure provides a battery detection and charging control method, apparatus, device and medium.
In a first aspect, the present disclosure provides a battery detection method, including:
detecting the reference potential of the battery anode of the target calibration battery relative to the reference electrode, wherein the target calibration battery has target battery state parameters;
detecting the direct current impedance of the target calibration battery in the process of charging the target calibration battery;
and calculating the maximum charging current of the target calibration battery according to the reference potential and the direct current impedance.
In a second aspect, the present disclosure provides a battery charge control method, including:
rapidly charging a target battery, wherein the target battery has target battery state parameters;
detecting real-time charging current of a target battery in the process of rapidly charging the target battery;
executing a charging control operation corresponding to the real-time charging current under the condition that the real-time charging current is greater than or equal to the maximum charging current corresponding to the target battery state parameter;
the maximum charging current is obtained by calculation according to a reference potential and direct current impedance of the target calibration battery, the target calibration battery has target battery state parameters, the reference potential is the potential of a battery anode of the target calibration battery relative to a reference electrode, and the direct current impedance is obtained by detection in the process of charging the target calibration battery.
In a third aspect, the present disclosure provides a battery detection apparatus, including:
the first detection module is configured to detect a reference potential of a battery anode of a target calibration battery relative to a reference electrode, and the target calibration battery has a target battery state parameter;
the second detection module is configured to detect the direct current impedance of the target calibration battery in the process of charging the target calibration battery;
and the current calculation module is configured to calculate the maximum charging current of the target calibration battery according to the reference potential and the direct current impedance.
In a fourth aspect, the present disclosure provides a battery charge control device comprising:
a first control module configured to rapidly charge a target battery, the target battery having target battery state parameters;
the third detection module is configured to detect the real-time charging current of the target battery in the process of rapidly charging the target battery;
the second control module is configured to execute the charging control operation corresponding to the real-time charging current under the condition that the real-time charging current is greater than or equal to the maximum charging current corresponding to the target battery state parameter;
the maximum charging current is obtained by calculation according to a reference potential and direct current impedance of the target calibration battery, the target calibration battery has target battery state parameters, the reference potential is the potential of a battery anode of the target calibration battery relative to a reference electrode, and the direct current impedance is obtained by detection in the process of charging the target calibration battery.
In a fifth aspect, the present disclosure provides a computing device comprising:
a processor;
a memory for storing executable instructions;
wherein the processor is configured to read the executable instructions from the memory and execute the executable instructions to implement the battery detection method of the first aspect or to implement the battery charging control method of the second aspect.
In a sixth aspect, the present disclosure provides a computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to implement the battery detection method of the first aspect or to implement the battery charge control method of the second aspect.
Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:
the battery detection method provided by the embodiment of the disclosure can detect the reference potential of the battery anode of the target calibration battery relative to the reference electrode, detect the direct current impedance of the target calibration battery, and calculate the maximum charging current of the target calibration battery according to the reference potential and the direct current impedance. Therefore, the maximum charging current allowed by the target calibration battery can be quickly calibrated without disassembling the battery, and powerful data support is provided for the safe application of a battery system.
Drawings
The above and other features, advantages and aspects of various embodiments of the present disclosure will become more apparent by referring to the following detailed description when taken in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numbers refer to the same or similar elements. It should be understood that the drawings are schematic and that elements and components are not necessarily drawn to scale.
Fig. 1 is a schematic flow chart of a battery detection method according to an embodiment of the present disclosure;
fig. 2 is a schematic flow chart of a battery detection process according to an embodiment of the present disclosure;
fig. 3 is a schematic flowchart of a battery charging control method according to an embodiment of the disclosure;
fig. 4 is a schematic structural diagram of a battery detection apparatus according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a battery charging control apparatus according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a computing device according to an embodiment of the present disclosure.
Detailed Description
Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it is to be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.
It should be understood that the various steps recited in the method embodiments of the present disclosure may be performed in a different order, and/or performed in parallel. Moreover, method embodiments may include additional steps and/or omit performing the illustrated steps. The scope of the present disclosure is not limited in this respect.
The term "include" and variations thereof as used herein are open-ended, i.e., "including but not limited to". The term "based on" is "based, at least in part, on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Relevant definitions for other terms will be given in the following description.
It should be noted that the terms "first", "second", and the like in the present disclosure are only used for distinguishing different devices, modules or units, and are not used for limiting the order or interdependence relationship of the functions performed by the devices, modules or units.
It is noted that references to "a", "an", and "the" modifications in this disclosure are intended to be illustrative rather than limiting, and that those skilled in the art will recognize that "one or more" may be used unless the context clearly dictates otherwise.
The names of messages or information exchanged between devices in the embodiments of the present disclosure are for illustrative purposes only, and are not intended to limit the scope of the messages or information.
Fig. 1 is a schematic flow chart of a battery detection method according to an embodiment of the present disclosure. In some embodiments of the present disclosure, the method shown in fig. 1 may be applied to a battery inspection apparatus to inspect a battery before shipping.
As shown in fig. 1, the battery test method may include the following steps.
And S110, detecting the reference potential of the battery anode of the target calibration battery relative to the reference electrode, wherein the target calibration battery has target battery state parameters.
Specifically, the present disclosure does not limit the specific type of the target calibration battery, and the target calibration battery may be a lithium battery, for example.
Specifically, the target battery state parameter is a battery state parameter of the target calibration battery in the target test state, and the specific type of the battery state parameter is not limited in the present disclosure.
Optionally, the target battery state parameter includes a target ambient temperature at which the target calibration battery is located and a target battery state of charge that the target calibration battery has. The target ambient temperature may be any ambient temperature, and the target battery state of charge may be any battery state of charge, where a specific value of the target ambient temperature and a specific value of the target battery state of charge are not limited. Exemplary target environmental temperatures include-20 ℃, -15 ℃, -10 ℃, -5 ℃, 0 ℃, 5 ℃, 10 ℃, 15 ℃, 20 ℃, 25 ℃, 30 ℃, 35 ℃ and 40 ℃, 45 ℃, 50 ℃, 55 ℃, 60 ℃. The SOC of the target battery can be arbitrarily selected from 0% to 100%.
Specifically, the battery usually includes a battery positive electrode and a battery negative electrode, and the potential of the battery positive electrode (single electrode) is difficult to measure, so when the potential of the battery positive electrode is measured, an electrode with a known electrode potential (i.e., a reference electrode) can be configured, so that the battery positive electrode and the reference electrode become a new battery, and the electromotive force of the new battery can be measured, so that the potential of the battery positive electrode relative to the reference electrode can be obtained.
The material of the reference electrode is not limited in this disclosure, and may be a conductive material, and for example, the material of the reference electrode may be selected from lithium, a lithium alloy, or a lithium-containing compound having electrochemical activity.
In one example, where the target ambient temperature comprises 25 ℃ and the target battery state of charge comprises SOC50%, the reference potential of the battery anode of the target calibration battery relative to the reference electrode may be detected when the target battery state of charge is SOC50% and the target ambient temperature is 25 ℃.
And S120, detecting the direct current impedance of the target calibration battery in the process of charging the target calibration battery.
Specifically, the charging mode of the target calibration battery is not limited in the present disclosure, and for example, a constant current charging mode may be adopted, and a constant voltage charging mode may also be adopted. When charging is performed in a constant current charging manner, constant current charging may be performed with a preset current, a value range of the preset current may be less than or equal to a current corresponding to a 1C charging and discharging rate, and the preset current may be, for example, (1/3) a current corresponding to a C charging and discharging rate, or (1/2) a current corresponding to a C charging and discharging rate, or the like.
Specifically, in the process of charging the target calibration battery, detecting the dc impedance of the target calibration battery may specifically include: starting from the state of charge of the battery being SOC0%, carrying out constant current charging on the target calibration battery at a preset current until the target calibration battery is fully charged, and detecting the direct current impedance of the target calibration battery. Therefore, the direct current impedance of the target calibration battery under different target battery charge states can be detected by carrying out a complete charging process (from 0 to full charge) on the target calibration battery, and the detection efficiency of the direct current impedance is favorably improved.
In one example, where the target ambient temperature comprises 25 ℃ and the target battery state of charge comprises SOC50%, the dc impedance of the target calibration battery corresponding to 25 ℃ may be detected when the target battery state of charge is SOC 50%.
And S130, calculating the maximum charging current of the target calibration battery according to the reference potential and the direct current impedance.
Optionally, calculating the maximum charging current of the target calibration battery according to the reference potential and the dc impedance, including: the ratio of the reference potential to the dc impedance is taken as the maximum charging current. Therefore, the determination mode of the maximum charging current can be simple, and the maximum charging current of the battery can be detected quickly.
Specifically, if the reference potential corresponding to a certain target battery state parameter is U and the dc impedance is R, the maximum charging current corresponding to the target battery state of the target calibration battery is I, I = U/R.
In one example, if the target ambient temperature includes 25 ℃ and the target battery state of charge includes SOC50%, the ratio of the reference potential to the dc impedance corresponding to the target battery state of charge of SOC50% and the target ambient temperature of 25 ℃ may be used as the maximum charging current at the target battery state parameter.
The battery detection method provided by the embodiment of the disclosure can detect the reference potential of the battery anode of the target calibration battery relative to the reference electrode, detect the direct current impedance of the target calibration battery, and calculate the maximum charging current of the target calibration battery according to the reference potential and the direct current impedance. Therefore, the maximum charging current allowed by the target calibration battery can be rapidly calibrated without disassembling the battery, and powerful data support is provided for the safe application of the battery system.
In some embodiments of the present disclosure, detecting a reference potential of a cell positive electrode of a target calibration cell relative to a reference electrode comprises: performing performance test on the target calibration battery inserted with the reference electrode to obtain a reference potential; wherein, the reference electrode is positioned between the battery anode and the battery cathode of the target calibration battery.
Specifically, before the target calibration battery is packaged, a reference electrode may be inserted between the positive electrode and the negative electrode of the battery, and then the target calibration battery after the reference electrode is inserted may be packaged.
In one example, a lithium-plated copper wire having a diameter of 0.8mm is wrapped with a separator and inserted between a positive electrode and a negative electrode of the battery before the target calibration battery is packaged, and then the target calibration battery is sealed.
Optionally, performing a performance test on the target calibration battery inserted with the reference electrode to obtain a reference potential, including: performing performance test on the target calibration battery by using preset current to obtain reference potential; the preset current is determined according to the rated battery capacity of the target calibration battery.
Specifically, the preset current may be determined as follows: obtaining the rated battery capacity of a target calibration battery; determining current corresponding to the 1C charge-discharge rate according to the rated battery capacity; and taking alpha times of the current corresponding to the 1C charging and discharging rate as a preset current, wherein alpha is greater than 0 and less than or equal to 1, such as alpha =1/3 or 1/2.
In one example, when the rated battery capacity of the target calibration battery is 100Ah, the specific value of the 1C current is 100A, and thus the preset current is equal to or less than 100A.
Specifically, the performance test of the target calibration battery by using the preset current may include: and detecting the potential difference between the positive electrode and the reference electrode of the battery by using preset current under different target battery state parameters, and determining the reference potential of the positive electrode of the battery according to the potential difference and the potential of the reference electrode.
It can be understood that the reference potential is obtained by performing performance test on the target calibration battery by using the preset current, so that the reference potentials corresponding to the state parameters of the target batteries have consistent references, and accurate calculation parameters are provided for the subsequent accurate calculation of the maximum charging current.
In other embodiments of the present disclosure, detecting a dc impedance of a target calibration battery during charging of the target calibration battery includes: charging a target calibration battery to a target battery charge state at a constant current by using a preset current at normal temperature; the preset current is the current adopted when the reference electrode is detected, and is determined according to the rated battery capacity of the target calibration battery; under the target environment temperature, carrying out a pulse charging test of preset duration on a target calibration battery in the charge state of the target battery according to a target charging current corresponding to the target environment temperature; detecting the open circuit voltage difference of a target calibration battery before and after a pulse charging test; and calculating the direct current impedance according to the open circuit voltage difference and the target charging current.
Specifically, when the current battery state of charge of the target calibration battery is smaller than the target battery state of charge, the target calibration battery may be charged to the target battery state of charge at a constant current with a preset current, where the preset current may be a current used in detecting the reference electrode.
It can be understood that, by setting the preset current as the current used for detecting the reference electrode, the reference electrode and the detection of the direct current impedance have consistent reference, and accurate calculation parameters are provided for the subsequent accurate calculation of the maximum charging current.
As described above, α times of the current corresponding to the 1C charge-discharge rate is optionally used as the preset current, where α is greater than or equal to 1/3 and less than or equal to 1. Therefore, the problems that the battery generates heat and the service life of the battery is influenced due to the fact that the charging current is large can be avoided, and the problem that the charging time is long and the detection efficiency is influenced due to the fact that the charging current is too small can be avoided.
Specifically, the target charging current is the optimal charging current for its corresponding target ambient temperature. Because the performance of the battery at different environmental temperatures is different, and the optimal charging currents corresponding to different environmental temperatures are different, each target environmental temperature corresponds to one target charging current. The target charging current can be obtained according to an environment temperature-optimal charging current relation curve. Illustratively, the optimum charging current at 25 ℃ is 2.75C by querying the ambient temperature-optimum charging current relationship.
Specifically, the present disclosure does not limit a specific value of the preset time period, and the preset time period may be, for example, 1s, 3s, 5s, 10s, 15s, 30s, 60s, or the like.
Specifically, performing a pulse charging test for a preset duration on a target calibration battery in a target battery charge state means that, at a target environment temperature, when the battery charge state of the target calibration battery is the target battery charge state, a pulse charging test is started on the target calibration battery, that is, when the pulse charging test is started, the battery charge state of the target calibration battery is the target battery charge state, and when the pulse charging test is ended, the battery charge amount of the target calibration battery is increased.
Specifically, the open-circuit voltage of the detection target calibration battery before the pulse charge test (referred to as a first open-circuit voltage U1) and the open-circuit voltage of the detection target calibration battery after the pulse charge test (referred to as a first open-circuit voltage U2) are detected, and the open-circuit voltage difference Δ U, Δ U = U2-U1 is calculated.
Optionally, calculating the dc impedance according to the open circuit voltage difference and the target charging current includes: and taking the ratio of the open circuit voltage difference to the target charging current as the direct current impedance.
In one example, at normal temperature, with the preset current being 1/3C, the battery is charged to the charge state of a target battery at a constant current, and the first open-circuit voltage U1 of the target calibration battery is detected; then, carrying out a pulse charging test for a preset charging time (1 s, 3s, 5s, 10s, 15s, 30s or 60 s) by using a target charging current I (for example, 2.75C corresponding to 25 ℃) at a target environment temperature, detecting a second open-circuit voltage U2 of the target calibration battery again, and subtracting the first open-circuit voltage U1 from the second open-circuit voltage U2 to obtain an open-circuit voltage difference delta U; and taking the ratio delta U/I of the open circuit voltage difference and the target charging current as the direct current impedance corresponding to the target charge state and the target ambient temperature. By analogy, the direct current impedance of each target charge state and each target environment temperature can be obtained.
The direct current impedance is calculated through the open circuit voltage difference and the target charging current, the maximum charging current is calculated through the reference potential and the direct current impedance, the maximum charging current allowed by the target calibration battery covering the voltage, the current and the internal resistance can be verified, data support can be provided for safe use of the battery system, whether risks can occur under the condition of large current pulse impact can be effectively analyzed when the subsequent target calibration battery is put into use or not in time, guarantee is provided for safety and reliability of the battery system, and safety accidents caused by thermal expansion of the lithium ion battery system of the electric automobile are reduced.
Hereinafter, the method for detecting the internal resistance of the battery provided by the embodiment of the present disclosure will be described in detail based on a specific example.
Fig. 2 is a schematic flow chart of a battery detection process according to an embodiment of the present disclosure.
As shown in fig. 2, the battery test process may specifically include the following steps.
S210, performing performance test on the target calibration battery inserted with the reference electrode by using preset current to obtain the reference potential of the battery anode of the target calibration battery relative to the reference electrode.
And S220, charging the target calibration battery to a target battery charge state at a constant current by using a preset current at normal temperature.
The preset current is the current adopted when the reference electrode is detected, and is determined according to the rated battery capacity of the target calibration battery.
And S230, under the target environment temperature, carrying out a pulse charging test of preset duration on the target calibration battery in the charge state of the target battery according to the target charging current corresponding to the target environment temperature.
S240, detecting the open circuit voltage difference of the target calibration battery before the pulse charging test and after the pulse charging test.
And S250, taking the ratio of the open circuit voltage difference to the target charging current as the direct current impedance.
And S260, taking the ratio of the reference potential to the direct current impedance as the maximum charging current.
According to the battery detection method disclosed by the embodiment of the disclosure, when the reference potential detection and the pulse charging test are carried out, the same preset current is adopted, so that the reference electrode and the detection of the direct current impedance have consistent reference, and the calculation accuracy of the maximum charging current is favorably improved. In addition, in the battery detection process, the target calibration battery (preset current or target charging current) is charged by adopting the safe current, so that the target calibration battery is not damaged, and the battery is convenient to continuously put into use. Therefore, the maximum charging current of the target calibration battery under different target battery state parameters can be detected in situ, quickly and accurately.
Fig. 3 is a schematic flowchart of a battery charging control method according to an embodiment of the disclosure. In some embodiments of the present disclosure, the method shown in fig. 3 may be applied to a battery management system controller of a vehicle, and is applicable to a scenario of charging a target battery on the vehicle, and specifically may be used in a process of charging the target battery on the vehicle after the vehicle with the target battery is shipped from a factory.
As shown in fig. 3, the battery test method may include the following steps.
And S310, rapidly charging the target battery, wherein the target battery has target battery state parameters.
Specifically, the target battery described herein has the same structure as the target calibration battery in the method embodiment shown in fig. 1 and fig. 2, and may be at least one of the target calibration battery, a battery produced in the same batch as the target calibration battery, or a battery of the same type as the target calibration battery.
The present disclosure does not limit a specific type of the target battery, and the target battery may be, for example, a lithium battery.
In particular, the target battery state parameters may include at least some of the target battery state parameters in the method embodiments illustrated in fig. 1 and 2. Illustratively, the target battery has the same target battery state parameters as the target calibration battery in the method embodiment shown in fig. 1 and 2.
The present disclosure does not limit the specific type of the target battery state parameter. Optionally, the target battery state parameter includes a target ambient temperature at which the target calibration battery is located and a target battery state of charge which the target calibration battery has.
Specifically, the target battery may be connected to a charging device (e.g., a charging pile) for charging, and the charging manner of the target battery is not limited in the present disclosure, and may be, for example, a constant current charging manner, a step charging manner, a horizontal power charging manner, or a constant voltage charging manner. The present disclosure also does not limit the type of charging device, and the charging device may include a single-gun charging pile, or a A, B dual-gun charging pile, for example.
And S320, detecting the real-time charging current of the target battery in the process of quickly charging the target battery.
Specifically, the present disclosure does not limit the detection manner of the real-time charging current. Illustratively, this may be collected by a current sampling circuit in the battery management system of the vehicle.
And S330, executing the charging control operation corresponding to the real-time charging current under the condition that the real-time charging current is greater than or equal to the maximum charging current corresponding to the target battery state parameter.
The maximum charging current is obtained by calculation according to a reference potential and direct current impedance of the target calibration battery, the target calibration battery has target battery state parameters, the reference potential is the potential of a battery anode of the target calibration battery relative to a reference electrode, and the direct current impedance is obtained by detection in the process of charging the target calibration battery.
Specifically, when the real-time charging current is greater than or equal to the maximum charging current corresponding to the target battery state parameter, it indicates that the real-time charging current is equal to or exceeds the maximum charging capability of the target battery, and at this time, a charging control operation, such as early warning or power failure, may be performed according to the real-time charging current, so as to reduce the safety risk of the battery system. And when the real-time charging current is smaller than the maximum charging current corresponding to the state parameter of the target battery and the charging is carried out according to the charging strategy, the fact that the real-time charging current does not exceed the maximum charging capacity of the target battery is shown, and a battery system of the vehicle is in a safe state.
The battery charging control method provided by the embodiment of the disclosure can detect the real-time charging current of the target battery in the process of rapidly charging the target battery, and execute the charging control operation corresponding to the real-time charging current when the real-time charging current is greater than or equal to the maximum charging current corresponding to the state parameter of the target battery. Therefore, the charging condition can be monitored in real time based on the detected maximum charging current in the process of charging the target battery, and the safety risk of a battery system of the vehicle is reduced.
Research shows that when charging pile is abnormal, charging current of vehicles can be increased instantly. In addition, for the stake of two guns charging, when a vehicle has been under the circumstances of charging, when switching in another vehicle again and charging, even fill electric pile normally, also appear the circumstances that the rifle instantaneous current that charges becomes big very easily, lead to the charging current of the vehicle of back inserting great in the twinkling of an eye, exceed the maximum charging current that target battery state parameter corresponds. However, for a lithium battery, an abnormal pulse large charging current may cause the battery to have a lithium precipitation risk, and when the lithium battery is in such an operating mode for a long time, the lithium battery has a certain influence on the service life and safety of the battery. In addition, the instantaneous large charging current at the charging terminal may cause the battery to be overcharged, so that the material of the positive electrode of the battery is in an overcharged state. And the overcharge can cause irreversible phase change of the laminated structure of the battery anode material, and the active oxygen release can cause the thermal stability of the material to be poor when the laminated structure collapses. Therefore, monitoring the charging condition in real time based on the verified maximum charging current is very necessary for safe use. However, in the present disclosure, by detecting the charging current of the target battery (e.g., a lithium battery) in real time and comparing the real-time charging current with the maximum charging current, it can be timely and effectively analyzed whether the target battery is in danger or not under the conditions of a fault of the charging device, an instantaneous current surge occurring when a charging pile has a charging vehicle and then is connected to another vehicle for charging, a charging end, and the like, so as to provide a guarantee for the safe charging of the battery and reduce the safety accidents of the electric vehicle battery.
In other embodiments of the present disclosure, the performing of the charge control operation corresponding to the real-time charging current includes: under the condition that the real-time charging current meets the preset power-off condition, stopping charging the target battery; and/or; and controlling the vehicle to which the target battery belongs to give an alarm under the condition that the real-time charging current meets the preset early warning condition.
Specifically, the present disclosure does not limit the specific contents of the preset power-off condition.
Alternatively, the preset power-off condition may include the real-time charging current being equal to or greater than the first current value.
The first current value may be set according to the rated charging current and the maximum charging current, for example, the first current value may be 110% of the rated charging current of the target battery under the target battery state parameter, or the first current value may also be the maximum charging current of the target battery under the target battery state parameter.
Specifically, the present disclosure does not limit the specific content of the preset warning condition.
Optionally, the preset early warning condition may include that the real-time charging current is greater than or equal to the second current value and reaches a preset duration.
The second current value may be set according to the rated charging current and the maximum charging current, for example, the second current value may be 105% of the rated charging current of the target battery under the target battery state parameter, and the second current value may also be 0.95 times of the maximum charging current of the target battery under the target battery state parameter, and a person skilled in the art may set the preset time period according to the actual situation, for example, 10 seconds, 15 seconds, 30 seconds, 60 seconds, and the like.
It can be understood that, when the real-time charging current is greater than the maximum charging current corresponding to the target state parameter at a certain moment, the controller of the battery management system may be triggered to enter a detection mode for detecting whether the real-time charging current meets a preset power-off condition and/or meets an early-warning condition, in the detection mode, when the real-time charging current is greater than or equal to 105% of the rated charging current of the target battery under the target battery state parameter or greater than or equal to 0.95 times of the maximum charging current and continues for a preset duration, the vehicle to which the target battery belongs may be controlled to send an alarm without stopping charging, and when the real-time charging current is greater than or equal to 110% of the rated charging current of the target battery under the target battery state parameter or greater than or equal to the maximum charging current of the target battery under the target battery state parameter, the charging is stopped.
In some embodiments of the present disclosure, before the target battery is rapidly charged, the method further comprises: carrying out state detection on a target battery to obtain a target battery state parameter; and querying the rated charging current and/or the maximum charging current corresponding to the target battery state parameter.
Specifically, the maximum charging current corresponding to the target battery state parameter may be obtained by querying a target battery state parameter-maximum charging current association relationship stored in the battery management system controller in advance, where the target battery state parameter-maximum charging current association relationship is obtained by the method shown in fig. 1 and 2 before the target battery leaves a factory.
Specifically, the rated charging current corresponding to the target battery state parameter may be obtained by querying a target battery state parameter-rated charging current association relationship pre-stored in the battery management system controller, where the target battery state parameter-rated charging current association relationship is obtained through a related test experiment before the target battery leaves a factory.
In one example, the maximum charging currents corresponding to different target battery state parameters may be pre-stored in the battery management system controller, and the battery management system controller may detect the battery state each time it detects that the vehicle is connected to a fast charging device (e.g., a fast charging pile), and then query the maximum charging current corresponding to the battery state parameter and the rated charging current corresponding to the target battery. The battery management system controller can send the rated charging current to the quick charging equipment, so that the quick charging equipment charges the target battery according to the rated charging current. In the process of rapidly charging the target battery, the battery management system controller can also detect the real-time charging current of the target battery, judge whether the maximum charging current is exceeded or not, and execute the charging control operation corresponding to the real-time charging current when the maximum charging current is exceeded. Therefore, the battery management system controller can select the rated charging current according to the target battery, so that the target battery is charged in a relatively safe state with a relatively high charging speed. And moreover, the battery management system controller can also execute early warning or stop charging operation in time when the real-time charging current exceeds the maximum charging current, so that safety accidents are avoided, and the safety charging of the battery is guaranteed.
Fig. 4 shows a schematic structural diagram of a battery detection apparatus 400 provided in an embodiment of the present disclosure.
In some embodiments of the present disclosure, the apparatus shown in fig. 4 may be applied to a battery detection device, where the battery detection device is used for detecting the performance of a battery before the battery leaves a factory.
As shown in fig. 4, the battery test apparatus may include: a first detection module 410, a second detection module 420, and a current calculation module 430;
a first detection module 410, which may be configured to detect a reference potential of a cell positive electrode of a target calibration cell relative to a reference electrode, the target calibration cell having a target cell state parameter;
the second detection module 420 may be configured to detect a dc impedance of the target calibration battery during charging of the target calibration battery;
the current calculating module 430 may be configured to calculate a maximum charging current of the target calibration battery according to the reference potential and the dc impedance.
The battery detection device provided by the embodiment of the disclosure can detect the reference potential of the battery anode of the target calibration battery relative to the reference electrode, detect the direct current impedance of the target calibration battery, and calculate the maximum charging current of the target calibration battery according to the reference potential and the direct current impedance. Therefore, the maximum charging current allowed by the target calibration battery can be quickly calibrated without disassembling the battery, and powerful data support is provided for the safe application of a battery system.
In other embodiments of the present disclosure, the second detecting module 420 may specifically include: the device comprises a charging unit, a pulse charging test unit, an open-circuit voltage difference detection unit and an impedance calculation unit;
the charging unit can be configured to charge the target calibration battery to a target battery charge state at a constant current by using a preset current at normal temperature; the preset current is the current adopted when the reference electrode is detected, and is determined according to the rated battery capacity of the target calibration battery;
the pulse charging test unit can be configured to perform a pulse charging test of a preset duration on a target calibration battery in a target battery charge state according to a target charging current corresponding to a target environment temperature at the target environment temperature;
the open circuit voltage difference detection unit can be configured to detect the open circuit voltage difference of the target calibration battery before the pulse charging test and after the pulse charging test;
and an impedance calculation unit configured to calculate a direct current impedance according to the open circuit voltage difference and the target charging current.
In other embodiments of the present disclosure, the impedance calculating unit may be specifically configured to use a ratio of the open circuit voltage difference to the target charging current as the dc impedance.
In other embodiments of the present disclosure, the current calculation module 430 may be specifically configured to set the ratio of the reference potential to the dc impedance as the maximum charging current.
It should be noted that the detection apparatus 400 may perform each step in the method embodiments shown in fig. 1 and fig. 2, and implement each process and effect in the method embodiments shown in fig. 1 and fig. 2, which are not described herein again.
Fig. 5 shows a schematic structural diagram of a battery charging control apparatus 500 according to an embodiment of the present disclosure.
In some embodiments of the present disclosure, the apparatus shown in fig. 5 may be applied to a battery charging control device of a vehicle, where the battery charging control device may be a battery management system controller of the vehicle.
As shown in fig. 5, the battery charge control apparatus may include: a first control module 510, a third detection module 520, and a second control module 530;
a first control module 510 that may be configured to rapidly charge a target battery, the target battery having target battery state parameters;
a third detecting module 520, which may be configured to detect a real-time charging current of the target battery during the rapid charging of the target battery;
a second control module 530, which may be configured to perform a charging control operation corresponding to the real-time charging current if the real-time charging current is greater than or equal to a maximum charging current corresponding to the target battery state parameter;
the maximum charging current is obtained by calculation according to a reference potential and direct current impedance of the target calibration battery, the target calibration battery has target battery state parameters, the reference potential is the potential of a battery anode of the target calibration battery relative to a reference electrode, and the direct current impedance is obtained by detection in the process of charging the target calibration battery.
The battery charging control device provided by the embodiment of the disclosure can detect the real-time charging current of the target battery in the process of rapidly charging the target battery, and execute the charging control operation corresponding to the real-time charging current when the real-time charging current is greater than or equal to the maximum charging current corresponding to the state parameter of the target battery. Therefore, the charging condition can be monitored in real time based on the detected maximum charging current in the process of charging the target battery, and the safety risk of a battery system of the vehicle is reduced.
In other embodiments of the present disclosure, the second control module 530 may include a charging stop unit and/or an early warning unit;
and the charging stopping unit can be configured to stop charging the target battery under the condition that the real-time charging current meets the preset power-off condition.
And the early warning unit can be configured to control the vehicle to which the target battery belongs to give an alarm under the condition that the real-time charging current meets a preset early warning condition.
In other embodiments of the present disclosure, the apparatus may further include a fourth detection module and a query module;
the fourth detection module can be configured to perform state detection on the target battery to obtain a target battery state parameter;
and the query module can be configured to query the maximum charging current corresponding to the target battery state parameter.
It should be noted that the battery charging control apparatus 500 shown in fig. 5 may perform each step in the method embodiment shown in fig. 3, and implement each process and effect in the method embodiment shown in fig. 3, which are not described herein again.
Fig. 6 shows a schematic structural diagram of a computing device provided by an embodiment of the present disclosure.
In some embodiments of the present disclosure, the computing device shown in fig. 6 may be a battery detection device, such as a battery tester, a power battery detector, a battery pack testing device, or the like, or the computing device may also be a battery management system controller of a vehicle, such as a driving computer or the like.
As shown in fig. 6, the computing device may include a processor 601 and a memory 602 that stores computer program instructions.
Specifically, the processor 601 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured to implement one or more Integrated circuits of the embodiments of the present Application.
The processor 601, by reading and executing the computer program instructions stored in the memory 602, may perform the steps of the battery detection method provided by the embodiments of the present disclosure (e.g., when the computing device is a battery detection device), or may perform the steps of the battery detection method provided by the embodiments of the present disclosure (e.g., when the computing device is a battery management system controller of a vehicle).
In one example, the computing device may also include a transceiver 603 and a bus 604. As shown in fig. 6, the processor 601, the memory 602, and the transceiver 603 are connected via a bus 604 and communicate with each other.
The disclosed embodiments also provide a computer-readable storage medium, which may store a computer program that, when executed by a processor, causes the processor to implement the battery detection method or the battery charging control method provided by the disclosed embodiments.
The storage medium may, for example, include a memory 602 of computer program instructions executable by a processor 601 of a computing device to perform the charging control method provided by embodiments of the present disclosure. Alternatively, the storage medium may be a non-transitory computer readable storage medium, for example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a Compact disc read only Memory (CD-ROM), a magnetic tape, a floppy disk, an optical data storage device, and the like.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the term "comprises/comprising" is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (11)
1. A battery test method, comprising:
detecting a reference potential of a battery anode of a target calibration battery relative to a reference electrode, wherein the target calibration battery has target battery state parameters;
detecting the direct current impedance of the target calibration battery in the process of charging the target calibration battery;
and calculating the maximum charging current of the target calibration battery according to the reference potential and the direct current impedance.
2. The method of claim 1, wherein the target battery state parameters include a target ambient temperature at which the target calibration battery is located and a target battery state of charge that the target calibration battery has;
wherein, in the process of charging the target calibration battery, detecting the dc impedance of the target calibration battery includes:
charging the target calibration battery to a target battery charge state at a constant current by using a preset current at normal temperature; the preset current is the current adopted when the reference electrode is detected, and is determined according to the rated battery capacity of the target calibration battery;
at the target environment temperature, according to the target charging current corresponding to the target environment temperature, carrying out a pulse charging test of a preset duration on the target calibration battery in the charge state of the target battery;
detecting the open circuit voltage difference of the target calibration battery before the pulse charging test and after the pulse charging test;
and calculating the direct current impedance according to the open circuit voltage difference and the target charging current.
3. The method of claim 2, wherein calculating the DC impedance based on the open circuit voltage difference and the target charging current comprises:
and taking the ratio of the open circuit voltage difference to the target charging current as the direct current impedance.
4. The method of claim 1, wherein calculating the maximum charging current of the target calibration battery based on the reference potential and the dc impedance comprises:
and taking the ratio of the reference potential to the direct current impedance as the maximum charging current.
5. A battery charge control method, comprising:
rapidly charging a target battery, wherein the target battery has target battery state parameters;
detecting real-time charging current of the target battery in the process of rapidly charging the target battery;
executing a charging control operation corresponding to the real-time charging current under the condition that the real-time charging current is greater than or equal to the maximum charging current corresponding to the target battery state parameter;
the maximum charging current is obtained by calculation according to a reference potential and a direct current impedance of a target calibration battery, the target calibration battery has a target battery state parameter, the reference potential is a potential of a battery anode of the target calibration battery relative to a reference electrode, and the direct current impedance is obtained by detection in a process of charging the target calibration battery.
6. The method of claim 5, wherein the performing the charging control operation corresponding to the real-time charging current comprises:
stopping charging the target battery under the condition that the real-time charging current meets a preset power-off condition; and/or the presence of a gas in the gas,
and controlling the vehicle to which the target battery belongs to give an alarm under the condition that the real-time charging current meets a preset early warning condition.
7. The method of claim 5, wherein prior to said rapidly charging the target battery, the method further comprises:
carrying out state detection on the target battery to obtain a state parameter of the target battery;
and inquiring the maximum charging current corresponding to the target battery state parameter.
8. A battery test apparatus, comprising:
the first detection module is configured to detect a reference potential of a battery anode of a target calibration battery relative to a reference electrode, wherein the target calibration battery has a target battery state parameter;
the second detection module is configured to detect the direct current impedance of the target calibration battery in the process of charging the target calibration battery;
and the current calculation module is configured to calculate the maximum charging current of the target calibration battery according to the reference potential and the direct current impedance.
9. A battery charge control device, comprising:
a first control module configured to rapidly charge a target battery, the target battery having target battery state parameters;
the third detection module is configured to detect the real-time charging current of the target battery in the process of rapidly charging the target battery;
the second control module is configured to execute a charging control operation corresponding to the real-time charging current when the real-time charging current is larger than or equal to the maximum charging current corresponding to the target battery state parameter;
the maximum charging current is obtained by calculation according to a reference potential and a direct current impedance of a target calibration battery, the target calibration battery has a target battery state parameter, the reference potential is a potential of a battery anode of the target calibration battery relative to a reference electrode, and the direct current impedance is obtained by detection in a process of charging the target calibration battery.
10. A computing device, comprising:
a processor;
a memory for storing executable instructions;
wherein the processor is configured to read the executable instructions from the memory and execute the executable instructions to implement the battery detection method of any one of claims 1 to 4 or the battery charging control method of any one of claims 5 to 7.
11. A computer-readable storage medium, characterized in that the storage medium stores a computer program which, when executed by a processor, causes the processor to implement the battery detection method of any one of the preceding claims 1 to 4 or the battery charge control method of any one of the claims 5 to 7.
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