CN117590229A - Battery monitoring device and method and electrical equipment - Google Patents
Battery monitoring device and method and electrical equipment Download PDFInfo
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- CN117590229A CN117590229A CN202311560701.6A CN202311560701A CN117590229A CN 117590229 A CN117590229 A CN 117590229A CN 202311560701 A CN202311560701 A CN 202311560701A CN 117590229 A CN117590229 A CN 117590229A
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000012806 monitoring device Methods 0.000 title claims abstract description 29
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- 238000007599 discharging Methods 0.000 claims description 10
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- 238000000840 electrochemical analysis Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 abstract description 9
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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]
- G01R31/3644—Constructional arrangements
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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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
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
Abstract
The invention discloses a battery monitoring device, a battery monitoring method and electrical equipment, wherein the device comprises: the voltage acquisition module is used for acquiring the voltage of each battery cell; the current acquisition module is used for acquiring the current of each cell; the front-end processing module is respectively connected with the voltage acquisition module and the current acquisition module and is used for determining the internal resistance of each battery cell according to the voltage and the current of each battery cell and determining the state of each battery cell according to the internal resistance of each battery cell. Therefore, the internal resistance of each battery cell is calculated based on the detected voltage and current of each battery cell, the accuracy of internal resistance detection can be effectively improved, and further the accuracy of battery cell state judgment can be improved.
Description
Technical Field
The present invention relates to the field of battery technologies, and in particular, to a battery monitoring device, a battery monitoring method, and an electrical apparatus.
Background
As the charge and discharge power required by the electronic equipment is larger and larger, the service life of the battery is also more and more damaged, because dendrite is easy to generate when the battery is charged and discharged at high power, the safety of the battery in use is greatly reduced, so that a user is required to avoid quick charge, quick discharge, overcharging and overdischarge as much as possible in order to ensure the safety of the battery in use; or a high performance processor may be added to the battery management system to calculate and predict battery life. However, the above-mentioned method only delays the growth of dendrites and estimates the life and safety of the lithium battery by experience, and cannot thoroughly solve the safety concern of the user when using the battery.
In the related art, during the charge and discharge process of a battery, the voltage of each cell and the current of the whole battery are collected, the internal resistance of each cell is calculated according to the voltage of each cell and the current of the whole battery, and whether the cell is safe or not is judged according to the internal resistance of each cell. However, the accuracy of the internal resistance of each cell obtained based on the method is low, and a reliable data basis cannot be provided for the safety judgment of the cell.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent. Therefore, a first object of the present invention is to provide a battery monitoring device, which can effectively improve the accuracy of detecting the internal resistance by detecting the voltage and the current of each battery cell and calculating the internal resistance of each battery cell based on the detected voltage and current of each battery cell, thereby being beneficial to improving the accuracy of judging the state of the battery cell.
A second object of the present invention is to propose an electrical device.
A third object of the present invention is to provide a battery monitoring method.
To achieve the above object, an embodiment of a first aspect of the present invention provides a battery monitoring device, where a battery includes a plurality of cells connected in series, the device includes: the voltage acquisition module is used for acquiring the voltage of each battery cell; the current acquisition module is used for acquiring the current of each cell; the front-end processing module is respectively connected with the voltage acquisition module and the current acquisition module and is used for determining the internal resistance of each battery cell according to the voltage and the current of each battery cell and determining the state of each battery cell according to the internal resistance of each battery cell.
According to the battery monitoring device provided by the embodiment of the invention, the accuracy of the internal resistance detection can be effectively improved by detecting the voltage and the current of each battery cell and calculating the internal resistance of each battery cell based on the detected voltage and current of each battery cell, so that the accuracy of the state judgment of the battery cells is improved.
In some embodiments, the front-end processing module is specifically configured to: and when the battery is in a charging state or a discharging state, determining the internal resistance of each battery cell according to the voltage and the current of each battery cell.
In some embodiments, the apparatus further comprises: the constant current balancing module is used for balancing the battery when the battery is in an idle state; the front-end processing module is also used for determining the internal resistance of each cell according to the voltage and the current of each cell or the voltage and the balanced current of each cell.
In some embodiments, the equalization current is less than the charge current when the battery is in a charged state and the discharge current when the battery is in a discharged state.
In some embodiments, the front-end processing module is further configured to determine an equalization start time and/or an equalization duration of the next equalization according to the internal resistance of each cell and the equalization condition of the battery.
In some embodiments, the front-end processing module is specifically configured to obtain an internal resistance change condition of each battery cell, and determine, according to the internal resistance change condition, whether each battery cell is safe or not through electrochemical analysis of the battery.
In some embodiments, the apparatus further comprises: the temperature acquisition module is used for acquiring the temperature of each battery cell; the front-end processing module is also connected with the temperature acquisition module and is used for determining the temperature change condition of each battery cell according to the temperature of each battery cell and determining whether each battery cell is safe or not according to the temperature change condition and the internal resistance change condition of each battery cell.
In some embodiments, the apparatus further comprises: and the front-end processing module is also used for sending the abnormality reminding information of any one cell to the battery management system when the cell is in an abnormal state so that the battery management system executes an abnormality protection strategy.
In order to achieve the above object, a second aspect of the present invention provides an electrical apparatus, which includes the battery monitoring device.
According to the electrical equipment provided by the embodiment of the invention, based on the battery monitoring device, the accuracy of detecting the internal resistance can be effectively improved by detecting the voltage and the current of each battery cell and calculating the internal resistance of each battery cell based on the detected voltage and current of each battery cell, so that the accuracy of judging the state of the battery cell is improved.
To achieve the above object, according to a third aspect of the present invention, there is provided a battery monitoring method, the battery including a plurality of cells connected in series, the method including: collecting the voltage of each cell and the current of each cell; determining the internal resistance of each cell according to the voltage and the current of each cell; and determining the state of each battery cell according to the internal resistance of each battery cell.
According to the battery monitoring method provided by the embodiment of the invention, the accuracy of the internal resistance detection can be effectively improved by detecting the voltage and the current of each battery cell and calculating the internal resistance of each battery cell based on the detected voltage and current of each battery cell, so that the accuracy of the state judgment of the battery cells is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic view of a battery monitoring device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a battery monitoring circuit in the related art;
fig. 3 is a schematic view illustrating a structure of a battery monitoring device according to another embodiment of the present invention;
fig. 4 is a schematic circuit configuration diagram of constant current equalization according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a battery monitoring device according to still another embodiment of the present invention;
fig. 6 is a flowchart of a battery monitoring method according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The battery monitoring device, the battery monitoring method and the electrical equipment according to the embodiment of the invention are described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of a battery monitoring device according to an embodiment of the present invention.
In an embodiment of the invention, the battery comprises a plurality of cells connected in series.
Referring to fig. 1, a battery monitoring device 100 includes: a voltage acquisition module 110, a current acquisition module 120, and a front-end processing module 130. The voltage acquisition module 110 is used for acquiring the voltage of each cell; the current collection module 120 is configured to collect a current of each cell; the front-end processing module 130 is respectively connected to the voltage acquisition module 110 and the current acquisition module 120, and is configured to determine an internal resistance of each cell according to the voltage and the current of each cell, and determine a state of each cell according to the internal resistance of each cell.
Specifically, the voltage acquisition module 110 is configured to acquire the voltage of each cell in the battery, that is, the voltages at two ends of each cell, and the specific acquisition mode is not limited herein. The current collection module 120 is configured to collect the current of each cell in the battery, i.e. the current flowing through each cell, and the specific collection mode is not limited herein.
The front-end processing module 130 may be an intelligent analog front-end, and the internal resistance of each cell is calculated according to the voltage of each cell collected by the voltage collection module 110 and the current of each cell collected by the current collection module 120 when the battery is in a charging state, a discharging state or an equilibrium state, etc., by using the edge calculation processing capability of the front-end processing module 130. Because the internal resistance of each battery cell is calculated based on the voltage and the current acquired independently for each battery cell, compared with the mode of calculating the internal resistance of each battery cell by adopting the same current, the accuracy of detecting the internal resistance of each battery cell is effectively improved, and when the front-end processing module 130 determines the state of each battery cell based on the internal resistance of each battery cell, for example, the safety of each battery cell is determined based on the internal resistance of each battery cell, the accuracy of determining the state of each battery cell can be improved.
Specifically, fig. 2 is a schematic diagram of a conventional battery monitoring circuit structure, in which only a current acquisition unit ADC1 for acquiring the current of the whole string of battery cells is provided, and a voltage acquisition unit ADC0 for acquiring the voltage of each battery cell is provided, and then the battery management system BMS estimates the health and the life of the battery based on the voltage of each battery cell and the current of the whole string of battery cells. In an ideal case, under the condition that the internal resistance of each cell is consistent and unchanged, it is feasible for the battery management system BMS to estimate the health and the service life of the battery based on the collected voltage of each cell and the whole string of cell currents. However, in practice, the internal resistance of each cell may be inconsistent with different usage and temperatures, so in the conventional manner, the battery management system BMS needs a powerful processor to estimate the health and life of the battery.
However, in the embodiment of the invention, not only the voltage of each cell can be collected, but also the current of each cell can be collected, the internal resistance of each cell can be accurately calculated by using the voltage and the current of each cell, and then the state of each cell is determined based on the internal resistance of each cell, so that the accuracy of determining the state of each cell is improved, and a powerful processor is not required.
It should be noted that, the collection of the voltage and the current of the same battery cell is performed synchronously, that is, the voltage and the current of the same battery cell are collected through the voltage collecting module 110 and the current collecting module 120, so that the calculated internal resistance of the battery cell is not deviated due to the time difference between the collected voltage and the collected current of the battery cell, and further the judgment of the safety of the battery and the estimation of the health degree are affected.
It should be noted that, the current collection module 120 may adopt a conventional resistance sampling manner, or may also adopt an inductive sensor such as a magneto-resistive sensor, an infrared sensor, etc., so that the current of each battery cell can be detected in real time under the non-destructive condition.
In the above embodiment, by detecting the voltage and the current of each battery cell and calculating the internal resistance of each battery cell based on the detected voltage and current of each battery cell, the accuracy of detecting the internal resistance of the battery cell can be effectively improved, thereby being beneficial to improving the accuracy of judging the state of the battery cell without a powerful processor; meanwhile, the front-end processing module is adopted to detect the internal resistance of the battery cell and determine the state of the battery cell, so that the change of a battery management system can be reduced.
In some embodiments, the front-end processing module 130 is specifically configured to: and when the battery is in a charging state or a discharging state, determining the internal resistance of each battery cell according to the voltage and the current of each battery cell.
That is, the front-end processing module 130 may calculate the internal resistance of each battery cell according to the voltage of each battery cell collected by the voltage collecting module 110 and the current of each battery cell collected by the current collecting module 120 during the charging and discharging processes of the battery, and then determine the state of each battery cell based on the internal resistance of each battery cell, for example, determine the life and safety of each battery cell, so as to take protection measures in time when the battery cell is abnormal.
In some embodiments, referring to fig. 3, the battery monitoring device 100 further comprises: the constant current balancing module 140 is used for balancing the battery when the battery is in an idle state; the front-end processing module 130 is further configured to determine the internal resistance of each cell according to the voltage and the current of each cell, or the voltage and the balanced current of each cell.
It should be noted that, battery equalization includes active equalization and passive equalization, where active equalization refers to equalization implemented by energy transfer, such as transferring high-voltage battery cell energy to low-voltage battery cell or additionally providing energy to low-voltage battery cell; passive equalization refers to equalization of dissipated energy using resistors.
In the battery equalization, an active equalization mode or a passive equalization mode may be adopted, and the specific equalization mode is not limited herein. When the battery is balanced by adopting an active balancing mode or a passive balancing mode of transferring the energy of the high-voltage battery cells to the low-voltage battery cells, the front-end processing module 130 can calculate the internal resistance of each battery cell based on the acquired voltage and current of each battery cell; when the battery is balanced by adopting an active balancing manner in the battery cells for providing the energy to the low voltage, the front-end processing module 130 can calculate the internal resistance of each battery cell based on the acquired voltage and current of each battery cell, and can calculate the internal resistance of each battery cell based on the balanced current and the acquired voltage of each battery cell.
Specifically, the battery monitoring device 100 further includes a constant current balancing module 140, where the constant current balancing module 140 includes a constant current source, and the constant current source provides energy to the low-voltage battery cell to realize active balancing. By way of example, fig. 4 presents a schematic circuit diagram of the equalization of the battery by means of the constant current equalization module 140, in which circuit the constant current equalization module 140 may comprise a constant current source a, first switches SW0-SWn, and second switches C0-Cn. When the battery is in an idle state, the battery management system can control the first switches SW0-SWn and the second switches C0-Cn to enable the constant current source A to provide energy for the low-voltage battery cells so as to realize the balance of the battery; meanwhile, the voltage of the battery cells during battery equalization is collected through the voltage collection module 110, for example, the voltage sampling points of the battery cells in the odd rows are CVs, the voltage sampling points of the battery cells in the even rows are SWVs, and the current of the battery cells during battery equalization is collected through the current collection module 120, for example, the current sampling points of the battery cells in the odd rows are SWP, and the current sampling points of the battery cells in the even rows are SWN; the internal resistance of the cell is then calculated by the front-end processing module 130 based on the collected voltage and current of the cell. It will be appreciated that, since the current of the constant current source in the constant current balancing module 140 is constant, that is, the current flowing through each cell is constant and uniform, the front-end processing module 130 may also calculate the internal resistance of each cell based on the current of the constant current source, that is, the balancing current, and the acquired voltage of each cell. Thus, battery equalization and detection of internal resistance during equalization are realized.
In some embodiments, the equalization current is less than the charge current when the battery is in a charged state and the discharge current when the battery is in a discharged state.
Specifically, when the battery is balanced by the constant current balancing module 140, a small balancing current is adopted to provide energy for the low-voltage battery core, and the internal resistance change of the battery core can be well highlighted due to the small balancing current in the balancing process, and the charging and discharging current in the battery charging and discharging process is large, so that the internal resistance change is not obvious, and compared with the internal resistance detection in the battery charging and discharging process, the internal resistance detection in the battery balancing process is carried out by adopting the small balancing current, thereby being more beneficial to improving the accuracy of obtaining the internal resistance of the battery core.
It can be understood that although the internal resistance detection in the equalization process is more accurate, the internal resistance in the battery charging and discharging process cannot be detected in the method, so that in practical application, the internal resistance detection can be performed in the battery charging and discharging and equalization processes, and the monitoring of battery cells in each stage can be realized.
In some embodiments, the front-end processing module 130 is further configured to determine an equalization start time and/or an equalization duration of the next equalization according to the internal resistance of each cell and the equalization condition of the battery.
Specifically, the inconsistent internal resistances of the battery cells easily cause unbalanced charge and discharge among the battery cells, and some battery cells are easily overcharged or overdischarged, so that when the internal resistances of a plurality of battery cells in the battery are determined to have larger difference, the time interval between two times of equalization can be shortened or the time interval of each time of equalization can be increased.
For example, after the battery is balanced once, the battery balancing condition may be determined in various manners, for example, the voltage of each battery cell may be collected by the voltage collecting module 110 to determine the consistency of the voltages of the plurality of battery cells in the battery, and further determine the battery balancing condition; or detecting the capacity of each cell to determine the consistency of the capacities of a plurality of cells in the battery, and further determining the balance condition of the battery. Then, the front-end processing module 130 may determine, based on the internal resistances of the battery cells detected in the equalization process and the equalization condition of the battery after the equalization is completed, the equalization start time, the equalization duration, or the equalization start time and the equalization duration of the next equalization, where the internal resistances of the plurality of battery cells in the battery differ greatly, the earlier the equalization start time, the longer the equalization duration, the worse the equalization effect, the earlier the equalization start time, and the longer the equalization duration.
Therefore, according to the internal resistance of each battery cell and the equalization condition of the battery, the equalization starting time and the equalization time length of the next equalization are determined, the battery can be equalized in time, and the probability of overcharging and overdischarging of the battery cells is reduced.
In some embodiments, the front-end processing module 130 is specifically configured to obtain an internal resistance change condition of each of the battery cells, and determine whether each of the battery cells is safe through electrochemical analysis of the battery according to the internal resistance change condition.
Specifically, the electrochemical reaction of the battery core is changed due to dendrite generated during the use of the battery, so that the internal resistance of the battery core is changed, the internal resistance change condition of each battery core is calculated by using the calculation capability of the front-end processing module 130, and the use safety, the service life and the like of the battery core are judged through electrochemical analysis of the battery based on the internal resistance change condition of each battery core.
For example, the internal resistance change condition of each battery cell can be calculated based on the internal resistance of each battery cell, a time-varying internal resistance change curve is obtained, and then the internal resistance change curve is compared with a normal reference internal resistance change curve obtained in advance based on the electrochemical reaction test of the battery cell to determine whether each battery cell is safe or not. For example, if the internal resistance change curve differs greatly from the reference internal resistance change curve, the corresponding battery cell is not safe; for another example, if a certain internal resistance variation in the internal resistance variation curve has a larger deviation compared with a corresponding internal resistance variation in the reference internal resistance variation curve, the corresponding battery cell is unsafe.
In some embodiments, the battery monitoring apparatus 100 further includes: the temperature acquisition module 150 is used for acquiring the temperature of each cell; the front-end processing module 130 is further connected to the temperature acquisition module 150, and is configured to determine a temperature change condition of each battery cell according to the temperature of each battery cell, and determine whether each battery cell is safe according to the temperature change condition and the internal resistance change condition of each battery cell.
That is, in monitoring the battery, not only the internal resistance of each cell is detected in the foregoing manner, but also the temperature of each cell is collected by the temperature collection module 150, and thus the safety of each cell is determined by the front-end processing module 130 based on the temperature and the internal resistance of each cell, so that the state of the cell is monitored from multiple dimensions. For example, when the temperature of the battery cell is suddenly changed or the internal resistance is suddenly changed, that is, when one of the battery cells is abnormal, the battery cell can be considered to be unsafe; as another example, in the foregoing example, if there is a large deviation of a certain internal resistance variation amount in the internal resistance variation curve from a corresponding internal resistance variation amount in the reference internal resistance variation curve, or the temperature of the battery cell exceeds a threshold value, the battery cell is considered unsafe.
It can be appreciated that the front-end processing module 130 may also determine the safety of each cell based on the temperature, the internal resistance, the voltage change condition, etc. of each cell, so as to realize more dimensional monitoring of the cell state.
In some embodiments, referring to fig. 5, the battery monitoring device 100 further comprises: the battery management system 160, where the battery management system 160 is connected to the front-end processing module 130, and the front-end processing module 130 is further configured to send, when any one of the battery cells is in an abnormal state, abnormality alert information of the battery cell to the battery management system 160, so that the battery management system 160 executes an abnormality protection policy.
Specifically, the front-end processing module 130 may be a core processing unit for accurately calculating the internal resistance of the battery cell and estimating the service life and safety of the battery cell, and may be used as an edge calculating unit, and the battery management system 160 may be a conventional battery management system, and may be used as a back-end processing unit to implement integrated management control on the battery.
When the front-end processing module 130 determines that one or more battery cells are unsafe based on the foregoing manner, the abnormality reminding information of the corresponding battery cells can be sent to the battery management system 160, where the abnormality reminding information includes the identification information of the battery cells, so after the battery management system 160 receives the abnormality reminding information of the battery cells, the unsafe battery cells can be determined, and then a corresponding abnormality protection strategy, such as shorting the battery cells, is performed, so as to avoid that the whole battery cannot be used or dangerous situations occur due to the abnormality of the battery cells.
Therefore, the safety of each battery cell is accurately judged, and a corresponding abnormal protection strategy is further provided for the battery cell, so that the overall safety and the working reliability of the battery can be improved to a certain extent.
In some embodiments, an electrical device is also provided, including the aforementioned battery monitoring apparatus.
It should be noted that the electrical devices include, but are not limited to, electric bicycles, electric vehicles, electric tools, and other devices having a battery composed of a plurality of electric cells.
According to the electrical equipment provided by the embodiment of the invention, based on the battery monitoring device, the accuracy of detecting the internal resistance can be effectively improved by detecting the voltage and the current of each battery cell and calculating the internal resistance of each battery cell based on the detected voltage and current of each battery cell, so that the accuracy of judging the state of the battery cell is improved.
In some embodiments, a battery monitoring method is also provided.
Fig. 6 is a flowchart of a battery monitoring method according to an embodiment of the present invention. Wherein, the battery includes a plurality of electric cores that are connected in series, referring to fig. 6, the battery monitoring method includes:
s101, collecting the voltage of each battery cell and the current of each battery cell.
S102, determining the internal resistance of each battery cell according to the voltage and the current of each battery cell.
S103, determining the state of each battery cell according to the internal resistance of each battery cell.
It should be noted that, regarding the embodiments and effects of the battery monitoring method, reference may be made to the embodiments and effects of the battery monitoring device, and detailed descriptions thereof are omitted herein.
According to the battery monitoring method provided by the embodiment of the invention, the accuracy of the internal resistance detection can be effectively improved by detecting the voltage and the current of each battery cell and calculating the internal resistance of each battery cell based on the detected voltage and current of each battery cell, so that the accuracy of the state judgment of the battery cells is improved.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, for example, may be considered as a ordered listing of executable instructions for implementing logical functions, and may be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A battery monitoring device, wherein the battery comprises a plurality of cells connected in series, the device comprising:
the voltage acquisition module is used for acquiring the voltage of each battery cell;
the current acquisition module is used for acquiring the current of each battery cell;
the front-end processing module is respectively connected with the voltage acquisition module and the current acquisition module and is used for determining the internal resistance of each battery cell according to the voltage and the current of each battery cell and determining the state of each battery cell according to the internal resistance of each battery cell.
2. The battery monitoring device of claim 1, wherein the front-end processing module is specifically configured to: and when the battery is in a charging state or a discharging state, determining the internal resistance of each battery cell according to the voltage and the current of each battery cell.
3. The battery monitoring device of claim 1, wherein the device further comprises:
the constant current balancing module is used for balancing the battery when the battery is in an idle state;
the front-end processing module is further used for determining the internal resistance of each battery cell according to the voltage and the current of each battery cell or the voltage and the balanced current of each battery cell.
4. The battery monitoring device of claim 3, wherein the equalization current is less than a charge current when the battery is in a charged state and a discharge current when the battery is in a discharged state.
5. The battery monitoring device according to claim 3, wherein the front-end processing module is further configured to determine an equalization start time and/or an equalization duration of the next equalization according to an internal resistance of each of the battery cells and an equalization condition of the battery.
6. The battery monitoring device according to any one of claims 1 to 5, wherein the front-end processing module is specifically configured to obtain an internal resistance change condition of each of the battery cells, and determine whether each of the battery cells is safe through electrochemical analysis of the battery according to the internal resistance change condition.
7. The battery monitoring device of claim 6, wherein the device further comprises:
the temperature acquisition module is used for acquiring the temperature of each battery cell;
the front-end processing module is further connected with the temperature acquisition module and is used for determining the temperature change condition of each battery cell according to the temperature of each battery cell and determining whether each battery cell is safe or not according to the temperature change condition and the internal resistance change condition of each battery cell.
8. The battery monitoring device of claim 1, wherein the device further comprises:
and the front-end processing module is also used for sending the abnormal reminding information of any one of the battery cells to the battery management system when the battery cell is in an abnormal state so that the battery management system executes an abnormal protection strategy.
9. An electrical apparatus comprising a battery monitoring device according to any one of claims 1-8.
10. A method of monitoring a battery, the battery comprising a plurality of cells connected in series, the method comprising:
collecting the voltage of each battery cell and the current of each battery cell;
determining the internal resistance of each battery cell according to the voltage and the current of each battery cell;
and determining the state of each battery cell according to the internal resistance of each battery cell.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311560701.6A CN117590229A (en) | 2023-11-21 | 2023-11-21 | Battery monitoring device and method and electrical equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311560701.6A CN117590229A (en) | 2023-11-21 | 2023-11-21 | Battery monitoring device and method and electrical equipment |
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| CN117590229A true CN117590229A (en) | 2024-02-23 |
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| CN202311560701.6A Pending CN117590229A (en) | 2023-11-21 | 2023-11-21 | Battery monitoring device and method and electrical equipment |
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| CN (1) | CN117590229A (en) |
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