CN116435641A - Method for identifying internal temperature of energy storage battery - Google Patents
Method for identifying internal temperature of energy storage battery Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/627—Stationary installations, e.g. power plant buffering or backup power supplies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/60—Heating or cooling; Temperature control
- H01M10/63—Control systems
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention provides an energy storage battery internal temperature identification method. The method for identifying the internal temperature of the energy storage battery comprises the following steps: acquiring temperature data of battery monomers in each battery pack; acquiring the position of a target battery monomer; judging whether the temperature relationship between the target battery monomer and the adjacent battery monomer accords with a preset temperature relationship or not; if the preset temperature relation is met, the target battery cell temperature is judged to be normal, and if the preset temperature relation is not met, the target battery cell temperature is judged to be abnormal. According to the method for identifying the internal temperature of the energy storage battery, disclosed by the invention, the accuracy of judging the temperature of the battery monomer can be improved.
Description
Technical Field
The invention relates to the technical field of batteries, in particular to an internal temperature identification method of an energy storage battery.
Background
The energy storage system at least comprises a plurality of battery modules, each battery module is formed by connecting a plurality of battery cells in series or in parallel, and each battery module is provided with a battery management system for collecting voltage, current and temperature information of the battery module and estimating the State of Charge (SOC) and the State of life (SOH) of the battery, and identifying and diagnosing faults of the battery cells. The temperature information is the parameter which can most reflect the current health state of the battery cell, and the battery cell generates severe electrochemical reaction inside the battery cell when thermal runaway occurs, so that the internal temperature is rapidly increased, and when the separator between the positive electrode and the negative electrode in the battery cell is dissolved, the internal positive electrode and the negative electrode also generate short circuit to generate high heat, and the performance forms are all the temperature changes of the battery in a whole.
The related art discloses a battery internal temperature identification method, which is used for predicting battery internal temperature information by collecting battery external temperature and based on a battery internal temperature prediction model, and finally judging whether a battery system has abnormal heat generation according to the battery internal temperature. The method can accurately train the internal temperature of the battery through a large number of data models, and accurately judge the state of the battery according to the internal temperature of the battery. However, the battery system is formed by aggregating a plurality of battery monomers, the battery monomers can generate a large amount of heat energy in the charge and discharge process, and the temperature of the battery monomer positioned at the middle part is far higher than that of the battery monomer positioned at the outer side due to the heat radiation effect, so that the method can only identify the temperature of one battery monomer, and can not consider the temperature condition of the battery monomer and the influence of other battery monomers on the target battery monomer from the angle of the system, and the influence is truly existing and quite non-negligible, and the heat change of the battery monomer generated by the aggregation effect inevitably affects the heat generation judgment result, so that the abnormal heating judgment accuracy of the battery monomer is poor.
Disclosure of Invention
The invention mainly aims to provide an internal temperature identification method for an energy storage battery, which can improve the accuracy of temperature judgment of a battery monomer.
In order to achieve the above object, according to an aspect of the present invention, there is provided an internal temperature identification method of an energy storage battery, comprising:
acquiring temperature data of battery monomers in each battery pack;
acquiring the position of a target battery monomer;
judging whether the temperature relationship between the target battery monomer and the adjacent battery monomer accords with a preset temperature relationship or not;
if the preset temperature relation is met, the target battery cell temperature is judged to be normal, and if the preset temperature relation is not met, the target battery cell temperature is judged to be abnormal.
Further, the step of determining whether the temperature relationship between the target battery cell and the adjacent battery cell meets the preset temperature relationship includes:
calculating the average temperature of adjacent battery monomers;
calculating the temperature offset between the target battery cell and the average temperature;
and comparing the temperature deviation value with a preset temperature deviation, if the temperature deviation value is within the preset temperature deviation, judging that the temperature of the target battery cell accords with a preset temperature relation, and if the temperature deviation value is outside the preset temperature deviation, judging that the temperature of the target battery cell does not accord with the preset temperature relation.
Further, the step of obtaining the location of the target battery cell includes:
obtaining the serial-parallel number of batteries and the serial number of modules;
dividing the temperature data of each battery pack into monomer arrays B [ H, V ] according to the serial-parallel connection number of the batteries, wherein H is the number of rows and V is the number of columns;
and identifying the row number b [ h, v ] of the target battery cell.
Further, the step of calculating the average temperature of the adjacent battery cells includes:
positioning adjacent battery cells: b [ H-1, V-1], b [ H-1, V ], b [ H-1, v+1], b [ H, V-1], b [ H, v+1], b [ h+1, V-1], b [ h+1, V ], b [ h+1, v+1], wherein 0< (H-1) < (h+1) < H,0< (V-1) < (v+1) < V;
acquiring temperature data of each adjacent battery cell;
the average temperature Ave of adjacent cells=sum of all adjacent cell temperatures/number of adjacent cells is calculated.
Further, the step of obtaining temperature data of the battery cells in each battery pack includes:
summarizing all battery temperature data;
and acquiring temperature data of each battery cell in the subordinate battery pack through the BMS.
Further, the method for identifying the internal temperature of the energy storage battery further comprises the following steps:
if the positions of the target battery monomers are four corners of the periphery of the battery pack, comparing the temperatures of the battery monomers at the four corners;
if the temperature difference between the target battery monomer and the other battery monomers at the four corners is larger than the preset temperature deviation, judging that the temperature of the target battery monomer is abnormal.
Further, the step of determining whether the temperature relationship between the target battery cell and the adjacent battery cell meets the preset temperature relationship includes:
identifying the number of the grouping strings of the single battery packs and arranging the grouping strings into a battery cell array;
establishing a coordinate axis by taking H/2 and V/2 as centers, and dividing the battery cell array into four quadrants, wherein H is the number of rows of the battery cell array, and V is the number of columns of the battery cell array;
determining the region where the target battery cell is located;
and determining whether the temperature change relation between the target battery cell and the adjacent battery cell accords with a preset temperature relation according to the region.
Further, the step of determining whether the temperature change relationship between the target battery cell and the adjacent battery cell accords with the preset temperature relationship according to the located region includes:
positioning adjacent battery cells adjacent to the heat source by taking the central battery cell as the heat source;
when the adjacent battery cell is at the first quadrant, then b [ h+1, v-1] is close to the heat source, and b [ h-1, v+1] is far away from the heat source;
when the adjacent battery cell is at the second quadrant, then b [ h+1, v+1] is close to the heat source, and b [ h-1, v-1] is far away from the heat source;
when the adjacent battery cell is at the third quadrant, then b [ h-1, v+1] is close to the heat source, and b [ h+1, v-1] is far away from the heat source;
when the adjacent battery cell is at the fourth quadrant, then b [ h-1, v-1] is close to the heat source, and b [ h+1, v+1] is far away from the heat source;
when the temperature of the adjacent battery cell far from the heat source is less than the target battery cell temperature t is less than the temperature of the adjacent battery cell close to the heat source, the temperature change relationship between the target battery cell and the adjacent battery cell is judged to be in accordance with the preset temperature relationship, otherwise, the temperature change relationship between the target battery cell and the adjacent battery cell is judged to be not in accordance with the preset temperature relationship.
Further, the step of determining whether the temperature change relationship between the target battery cell and the adjacent battery cell accords with the preset temperature relationship according to the located region further includes:
judging whether the target battery cell is positioned on the axis or not;
if the target battery cell is located on the axes of the first quadrant and the second quadrant, b [ h+1, v ] is close to the heat source, and b [ h-1, v ] is far away from the heat source;
if the target battery cell is located on the axes of the second quadrant and the third quadrant, b [ h, v+1] is close to the heat source, and b [ h, v-1] is far away from the heat source;
if the target battery cell is located on the axes of the third quadrant and the fourth quadrant, b [ h-1, v ] is close to the heat source, and b [ h+1, v ] is far away from the heat source;
if the target battery cell is located on the axes of the first quadrant and the fourth quadrant, b [ h, v-1] is close to the heat source, and b [ h, v+1] is far away from the heat source;
when the temperature of the adjacent battery cell far from the heat source is less than the target battery cell temperature t is less than the temperature of the adjacent battery cell close to the heat source, the temperature change relationship between the target battery cell and the adjacent battery cell is judged to be in accordance with the preset temperature relationship, otherwise, the temperature change relationship between the target battery cell and the adjacent battery cell is judged to be not in accordance with the preset temperature relationship.
Further, the method for identifying the internal temperature of the energy storage battery further comprises the following steps:
judging whether the temperature of a battery monomer positioned in the center of the array exceeds the upper limit value of the monomer temperature;
if the upper limit value of the monomer temperature is not exceeded, calculating a temperature difference value between the temperature of the battery monomer positioned in the center of the array and the temperature of the battery monomer positioned at the edge of the array;
judging whether the temperature difference exceeds a preset battery pack temperature difference value, if not, judging that the temperature of the battery cell is normal, and if so, judging that the temperature of the battery cell is abnormal.
By applying the technical scheme of the invention, the method for identifying the internal temperature of the energy storage battery comprises the following steps: acquiring temperature data of battery monomers in each battery pack; acquiring the position of a target battery monomer; judging whether the temperature relationship between the target battery monomer and the adjacent battery monomer accords with a preset temperature relationship or not; if the preset temperature relation is met, the target battery cell temperature is judged to be normal, and if the preset temperature relation is not met, the target battery cell temperature is judged to be abnormal. According to the method for identifying the internal temperature of the energy storage battery, abnormal heat generation of the battery is judged from the system angle, the target battery monomer is compared with the adjacent battery monomer, if the temperature change of the target battery monomer and the adjacent battery monomer is within the preset temperature relation range, the judgment is normal, the temperature of the single battery monomer is not taken as a fault judgment basis, the difference between the target battery monomer and the adjacent battery monomer is taken as a judgment basis, the judgment precision can be effectively improved, and the erroneous judgment caused by the influence of the external environment of the temperature of the battery monomer is avoided.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 illustrates a block diagram of an energy storage system of an embodiment of the present invention;
FIG. 2 illustrates a flow chart of a method for identifying the internal temperature of an energy storage battery according to one embodiment of the invention;
FIG. 3 illustrates a flow chart of a method for identifying the internal temperature of an energy storage battery according to one embodiment of the invention;
FIG. 4 illustrates a schematic diagram of the change in cell temperature inside an energy storage battery according to one embodiment of the present invention; and
fig. 5 is a schematic diagram showing a temperature distribution structure of an energy storage battery according to an embodiment of the present invention.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Referring to fig. 1 to 3 in combination, the present invention provides a method for identifying an internal temperature of an energy storage battery, including: acquiring temperature data of battery monomers in each battery pack; acquiring the position of a target battery monomer; judging whether the temperature relationship between the target battery monomer and the adjacent battery monomer accords with a preset temperature relationship or not; if the preset temperature relation is met, the target battery cell temperature is judged to be normal, and if the preset temperature relation is not met, the target battery cell temperature is judged to be abnormal.
According to the method for identifying the internal temperature of the energy storage battery, abnormal heat generation of the battery is judged from the system angle, the target battery monomer is compared with the adjacent battery monomer, if the temperature change of the target battery monomer and the adjacent battery monomer is within the preset temperature relation range, the judgment is normal, the temperature of the single battery monomer is not taken as a fault judgment basis, the difference between the target battery monomer and the adjacent battery monomer is taken as a judgment basis, the judgment precision can be effectively improved, and the erroneous judgment caused by the influence of the external environment of the temperature of the battery monomer is avoided.
In this embodiment, the energy storage system based on implementation of the internal temperature identification method of the energy storage battery includes n battery modules, each battery module is formed by connecting i battery cells in series and parallel, and each battery module is configured with a BMS for collecting information such as voltage and temperature of the battery cells, transmitting the information to the micro-grid controller, and processing and analyzing the information by the micro-grid controller.
The method for identifying the internal temperature of the energy storage battery is realized based on the micro-grid controller, and in order to solve the problem that the internal grouped thermal radiation of the battery system affects the battery monomers, the battery monomers are arranged in an actual grouped mode, and the temperatures of the target battery monomers and the adjacent battery monomers are compared, and the temperatures of the target battery monomers and the adjacent battery monomers are affected by the environment and are in linear change necessarily and have slow change trend, so that whether the temperature relationship between the target battery monomers and the adjacent battery monomers accords with the preset temperature relationship of the battery monomers at normal temperature can be judged according to the temperature relationship, if the temperature relationship accords with the preset temperature relationship, the temperature of the target battery monomers is normal, and if the temperature relationship does not accord with the preset temperature relationship, the temperature relationship of the target battery monomers is abnormal, and subsequent maintenance or replacement is required.
When judging whether the temperature relationship between the target battery cell and the adjacent battery cell accords with the preset temperature relationship of the battery cell at the normal temperature, there may be various judging modes, wherein one case can be judged by judging the temperature difference between the target battery temperature and the adjacent battery temperature, and the other case can be judged by judging the temperature change condition of the target battery temperature and the adjacent battery temperature relative to the heat source.
In one embodiment, the step of determining whether the temperature relationship between the target battery cell and the adjacent battery cell meets the preset temperature relationship includes: calculating the average temperature of adjacent battery monomers; calculating the temperature offset between the target battery cell and the average temperature; and comparing the temperature deviation value with a preset temperature deviation, if the temperature deviation value is within the preset temperature deviation, judging that the temperature of the target battery cell accords with a preset temperature relation, and if the temperature deviation value is outside the preset temperature deviation, judging that the temperature of the target battery cell does not accord with the preset temperature relation.
In this embodiment, whether the temperature relationship between the target battery cell and the adjacent battery cell accords with the preset temperature relationship or not can be judged by the temperature difference between the target battery cell and the adjacent battery cell, in general, when the battery cell is in the normal temperature range, the temperature change between the adjacent battery cells should be in a linear change relationship, so if the temperature change between the adjacent battery cells does not accord with the linear change rule between the temperatures of the normal battery cells, a larger fluctuation occurs, and the temperature of the target battery cell can be judged to be abnormal according to the fluctuation.
In one embodiment, the step of obtaining the location of the target battery cell includes: obtaining the serial-parallel number of batteries and the serial number of modules; dividing the temperature data of each battery pack into monomer arrays B [ H, V ] according to the serial-parallel connection number of the batteries, wherein H is the number of rows and V is the number of columns; identifying the row and column number b [ h, v ] of the target battery cell, wherein 0< h < H,0< v < V.
In one embodiment, a battery pack is composed of 96 cells, each module is 1P16S, and the battery pack is composed of 6 modules, and the cell array is B16, 6.
In one embodiment, the step of calculating the average temperature of the adjacent battery cells includes: positioning adjacent battery cells: b [ H-1, V-1], b [ H-1, V ], b [ H-1, v+1], b [ H, V-1], b [ H, v+1], b [ h+1, V-1], b [ h+1, V ], b [ h+1, v+1], wherein 0< (H-1) < (h+1) < H,0< (V-1) < (v+1) < V; acquiring temperature data of each adjacent battery cell; the average temperature Ave of adjacent cells=sum of all adjacent cell temperatures/number of adjacent cells is calculated.
Taking the cell array as B16, 6 as an example, if the target cell position is B8, 3, then the adjacent cells are B7, 2 respectively; b < 7,3 >; b < 7,4 >; b < 8,2 >; b < 8,4 >; b < 9,2 >; b < 9,3 >; b 9,4, when comparing the battery temperature, calculating the temperature deviation value between the average temperature of the target battery and the average temperature of other eight battery, if the temperature deviation value is larger than the preset temperature deviation, the temperature of the target battery is abnormal, if the temperature deviation value is within the preset temperature deviation range, the temperature of the target battery is normal.
The formula for calculating the temperature offset value is: and (3) T-ave < T, wherein T is the target battery cell temperature, ave is the average temperature of adjacent battery cells, and T is the preset temperature deviation.
In one embodiment, the step of acquiring temperature data of the battery cells in each battery pack includes: summarizing all battery temperature data; and acquiring temperature data of each battery cell in the subordinate battery pack through the BMS.
In this embodiment, after the temperature data of all the battery cells are obtained by the micro-grid controller, the temperature data of the battery cells in each battery pack may be obtained according to the BMS, and then the temperature of each battery cell may be determined by taking the battery pack as a unit. Because the environments of all the battery monomers in one battery pack are basically the same, the battery monomers in one battery pack are put together to carry out temperature comparison, so that the temperature judgment of the battery monomers is in the same environment, the temperature judgment of the battery monomers is more accurate, and the influence of the external environment is smaller.
In one embodiment, the method for identifying the internal temperature of the energy storage battery further comprises: if the positions of the target battery monomers are four corners of the periphery of the battery pack, comparing the temperatures of the battery monomers at the four corners; if the temperature difference between the target battery monomer and the other battery monomers at the four corners is larger than the preset temperature deviation, judging that the temperature of the target battery monomer is abnormal.
In this embodiment, because there is a large difference between the environment where the unit cells located at the four corners of the periphery of the battery pack are located and other unit cells, the number of adjacent surrounding cells is small, and it is difficult to meet the requirement of comparing the temperatures of the unit cells, while the environment and the position conditions where the four unit cells located at the four corners of the periphery of the battery pack are located are relatively close, so that the unit cells located at the four corners of the periphery of the battery pack can be put together to determine, and the temperature differences between the unit cells are compared, so as to determine the temperature conditions of the unit cells located at the four corners of the periphery of the battery pack accordingly. If the temperature of one battery monomer far exceeds the temperature of other battery monomers, the temperature of the battery monomer is judged to be abnormal, and if the temperature of any battery monomer is close to the temperature of the other battery monomers, the temperature of the battery monomer is judged to be normal.
In one embodiment, the step of determining whether the temperature relationship between the target battery cell and the adjacent battery cell meets the preset temperature relationship includes: identifying the number of the grouping strings of the single battery packs and arranging the grouping strings into a battery cell array; establishing a coordinate axis by taking H/2 and V/2 as centers, and dividing the battery cell array into four quadrants, wherein H is the number of rows of the battery cell array, and V is the number of columns of the battery cell array; determining the region where the target battery cell is located; and determining whether the temperature change relation between the target battery cell and the adjacent battery cell accords with a preset temperature relation according to the region.
Considering the influence of temperature aggregation, namely when a plurality of battery cells are arranged in a concentrated way, the battery can generate heat in the charge and discharge process, so that the battery cells positioned in the middle position are higher than the battery cells positioned on the outer side, and the temperature difference is large, and therefore, the phenomenon can be utilized to further judge the battery cell temperature and limit the battery cell temperature.
In one embodiment, the step of determining whether the temperature change relationship between the target battery cell and the adjacent battery cell meets the preset temperature relationship according to the located region includes: positioning adjacent battery cells adjacent to the heat source by taking the central battery cell as the heat source; when the adjacent battery cell is at the first quadrant, then b [ h+1, v-1] is close to the heat source, and b [ h-1, v+1] is far away from the heat source; when the adjacent battery cell is at the second quadrant, then b [ h+1, v+1] is close to the heat source, and b [ h-1, v-1] is far away from the heat source; when the adjacent battery cell is at the third quadrant, then b [ h-1, v+1] is close to the heat source, and b [ h+1, v-1] is far away from the heat source; when the adjacent battery cell is at the fourth quadrant, then b [ h-1, v-1] is close to the heat source, and b [ h+1, v+1] is far away from the heat source; when the temperature of the adjacent battery cell far from the heat source is less than the target battery cell temperature t is less than the temperature of the adjacent battery cell close to the heat source, the temperature change relationship between the target battery cell and the adjacent battery cell is judged to be in accordance with the preset temperature relationship, otherwise, the temperature change relationship between the target battery cell and the adjacent battery cell is judged to be not in accordance with the preset temperature relationship.
Referring to fig. 4 and 5, the battery cells in one battery pack are divided into nine rows and seven columns, wherein a54 is a central battery cell, a coordinate system needs to be established with a54 as a center, a14 to a94 are located on a Y axis, a51 to a57 are located on an X axis, so that the battery cells are divided into quadrants, the areas formed by a14 to a54 and a54 to a57 are first quadrants, the areas formed by a14 to a54 and a51 to a54 are second quadrants, the areas formed by a54 to a94 and a51 to a54 are third quadrants, the areas formed by a54 to a94 and a54 to a57 are fourth quadrants, the battery cell temperature at the a54 position is the highest when the temperatures of the battery cells are normal, and the temperatures of other battery cells are gradually reduced along the direction away from a 54.
Wherein A54 and the like are the numbers of the battery cells, the corresponding positions of the battery cells are b 5,4, and the corresponding relation between the numbers and the positions of other battery cells is the same.
When the A43 battery cell fails, the A43 battery cell is used as a target battery cell, the A43 battery cell is positioned in the second quadrant, and the condition that b [ h+1, v+1] is close to the heat source, b [ h-1, v-1] is far away from the heat source, namely, A54 is close to the heat source, and A32 is far away from the heat source is satisfied when the adjacent battery cell is in the second quadrant.
Therefore, in theory, the temperature of the a43 battery cell should be smaller than the temperature of the a54 battery cell and then greater than the temperature of the a32 battery cell, however, the actually detected temperature of the a43 battery cell is higher than the temperatures of the a54 battery cell and the a32 battery cell, and thus the above-mentioned temperature relationship is not met, that is, the temperature of the a43 battery cell is abnormal.
In one embodiment, the step of determining whether the temperature change relationship between the target battery cell and the adjacent battery cell accords with the preset temperature relationship according to the located region further includes: judging whether the target battery cell is positioned on the axis or not; if the target battery cell is located on the axes of the first quadrant and the second quadrant, b [ h+1, v ] is close to the heat source, and b [ h-1, v ] is far away from the heat source; if the target battery cell is located on the axes of the second quadrant and the third quadrant, b [ h, v+1] is close to the heat source, and b [ h, v-1] is far away from the heat source; if the target battery cell is located on the axes of the third quadrant and the fourth quadrant, b [ h-1, v ] is close to the heat source, and b [ h+1, v ] is far away from the heat source; if the target battery cell is located on the axes of the first quadrant and the fourth quadrant, b [ h, v-1] is close to the heat source, and b [ h, v+1] is far away from the heat source; when the temperature of the adjacent battery cell far from the heat source is less than the target battery cell temperature t is less than the temperature of the adjacent battery cell close to the heat source, the temperature change relationship between the target battery cell and the adjacent battery cell is judged to be in accordance with the preset temperature relationship, otherwise, the temperature change relationship between the target battery cell and the adjacent battery cell is judged to be not in accordance with the preset temperature relationship.
In one embodiment, the method for identifying the internal temperature of the energy storage battery further comprises: judging whether the temperature of a battery monomer positioned in the center of the array exceeds the upper limit value of the monomer temperature; if the upper limit value of the monomer temperature is not exceeded, calculating a temperature difference value between the temperature of the battery monomer positioned in the center of the array and the temperature of the battery monomer positioned at the edge of the array; judging whether the temperature difference exceeds a preset battery pack temperature difference value, if not, judging that the temperature of the battery cell is normal, and if so, judging that the temperature of the battery cell is abnormal.
In this embodiment, for the single battery in the middle position of the single battery array, the temperature of the single battery is highest, and the temperature of the single battery must not exceed the upper limit value of the single battery, when the temperature of the single battery is different from the temperature of the single battery at the most edge, the difference value of the single battery and the temperature of the single battery must not exceed the set value of the temperature difference of the battery pack, so as to ensure that the temperature of the single battery in the whole battery pack can be within the normal temperature range.
In one embodiment, the BMS employs an STM32f4 family of microcontrollers and the microgrid controller employs an ARM-A8 processor.
The invention has the following beneficial effects:
1) Judging abnormal heat generation of the battery cell from the angle of a system, comparing the target battery cell with the adjacent battery cell, judging as normal if the temperature difference of the target battery cell and the adjacent battery cell is within a permissible range, and judging according to the difference of the target battery cell and the adjacent battery cell instead of the single battery cell temperature as a fault judgment basis, so that the judgment precision can be effectively improved, and the influence of external environment is avoided to generate erroneous judgment;
2) Judging abnormal heat generation of the battery from the influence of heat radiation of the battery system, wherein the temperature change of the battery monomer inside the battery system inevitably follows the heat radiation temperature distribution because the heat radiation of the battery system exists truly and has great influence, the temperature of the target battery monomer is inevitably lower than the temperature of the adjacent battery monomer close to the heat source and higher than the temperature of the adjacent battery monomer far away from the heat source, and the temperature difference between the temperature of the target battery monomer and the temperature of the adjacent battery monomer is not great, so that the method can effectively limit the temperature of the target battery monomer, improve the judging accuracy, and further improve the judging accuracy by a method of comparing the temperature of the target battery monomer with the adjacent battery monomer;
3) The method eliminates the influence of abnormal heat generation judgment of the battery monomer in the external environment, if the battery system is in a high-current or high-temperature environment, the temperature of the battery monomer can be wholly increased, but the judgment result of the method is not influenced, and the temperature change rule of the target battery monomer is still applicable, so that the method has wide application range and is not influenced by environmental change, working condition change and battery type change.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An energy storage battery internal temperature identification method, comprising the steps of:
acquiring temperature data of battery monomers in each battery pack;
acquiring the position of a target battery monomer;
judging whether the temperature relationship between the target battery monomer and the adjacent battery monomer accords with a preset temperature relationship or not;
if the preset temperature relation is met, the target battery cell temperature is judged to be normal, and if the preset temperature relation is not met, the target battery cell temperature is judged to be abnormal.
2. The method of claim 1, wherein the step of determining whether the temperature relationship between the target cell and the adjacent cell meets a preset temperature relationship comprises:
calculating the average temperature of adjacent battery monomers;
calculating the temperature offset between the target battery cell and the average temperature;
and comparing the temperature deviation value with a preset temperature deviation, if the temperature deviation value is within the preset temperature deviation, judging that the temperature of the target battery cell accords with a preset temperature relation, and if the temperature deviation value is outside the preset temperature deviation, judging that the temperature of the target battery cell does not accord with the preset temperature relation.
3. The method of claim 2, wherein the step of obtaining the location of the target cell comprises:
obtaining the serial-parallel number of batteries and the serial number of modules;
dividing the temperature data of each battery pack into monomer arrays B [ H, V ] according to the serial-parallel connection number of the batteries, wherein H is the number of rows and V is the number of columns;
and identifying the row number b [ h, v ] of the target battery cell.
4. The method of claim 3, wherein the step of calculating the average temperature of adjacent cells comprises:
positioning adjacent battery cells: b [ h-1, v-1], b [ h-1, v ], b [ h-1, v+1], b [ h, v-1], b [ h, v+1], b [ h+1, v-1]
b [ h+1, V ], b [ h+1, v+1], wherein 0< (H-1) < (h+1) < H,0< (V-1) < (v+1) < V;
acquiring temperature data of each adjacent battery cell;
the average temperature Ave of adjacent cells=sum of all adjacent cell temperatures/number of adjacent cells is calculated.
5. The method of claim 1, wherein the step of obtaining temperature data of the battery cells in each battery pack comprises:
summarizing all battery temperature data;
and acquiring temperature data of each battery cell in the subordinate battery pack through the BMS.
6. The method of claim 2, further comprising:
if the positions of the target battery monomers are four corners of the periphery of the battery pack, comparing the temperatures of the battery monomers at the four corners; if the temperature difference between the target battery monomer and the other battery monomers at the four corners is larger than the preset temperature deviation, judging that the temperature of the target battery monomer is abnormal.
7. The method of claim 1, wherein the step of determining whether the temperature relationship between the target cell and the adjacent cell meets a preset temperature relationship comprises:
identifying the number of the grouping strings of the single battery packs and arranging the grouping strings into a battery cell array;
establishing a coordinate axis by taking H/2 and V/2 as centers, and dividing the battery cell array into four quadrants, wherein H is the number of rows of the battery cell array, and V is the number of columns of the battery cell array;
determining the region where the target battery cell is located;
and determining whether the temperature change relation between the target battery cell and the adjacent battery cell accords with a preset temperature relation according to the region.
8. The method of claim 7, wherein determining whether the temperature change relationship between the target cell and the adjacent cell meets a preset temperature relationship according to the region comprises:
positioning adjacent battery cells adjacent to the heat source by taking the central battery cell as the heat source;
when the adjacent battery cell is at the first quadrant, then b [ h+1, v-1] is close to the heat source, and b [ h-1, v+1] is far away from the heat source;
when the adjacent battery cell is at the second quadrant, then b [ h+1, v+1] is close to the heat source, and b [ h-1, v-1] is far away from the heat source;
when the adjacent battery cell is at the third quadrant, then b [ h-1, v+1] is close to the heat source, and b [ h+1, v-1] is far away from the heat source;
when the adjacent battery cell is at the fourth quadrant, then b [ h-1, v-1] is close to the heat source, and b [ h+1, v+1] is far away from the heat source;
when the temperature of the adjacent battery cell far from the heat source is less than the target battery cell temperature t is less than the temperature of the adjacent battery cell close to the heat source, the temperature change relationship between the target battery cell and the adjacent battery cell is judged to be in accordance with the preset temperature relationship, otherwise, the temperature change relationship between the target battery cell and the adjacent battery cell is judged to be not in accordance with the preset temperature relationship.
9. The method of claim 8, wherein determining whether the temperature change relationship between the target cell and the adjacent cell meets a preset temperature relationship according to the region of the target cell further comprises: judging whether the target battery cell is positioned on the axis or not;
if the target battery cell is located on the axes of the first quadrant and the second quadrant, b [ h+1, v ] is close to the heat source, and b [ h-1, v ] is far away from the heat source;
if the target battery cell is located on the axes of the second quadrant and the third quadrant, b [ h, v+1] is close to the heat source, and b [ h, v-1] is far away from the heat source;
if the target battery cell is located on the axes of the third quadrant and the fourth quadrant, b [ h-1, v ] is close to the heat source, and b [ h+1, v ] is far away from the heat source;
if the target battery cell is located on the axes of the first quadrant and the fourth quadrant, b [ h, v-1] is close to the heat source, and b [ h, v+1] is far away from the heat source;
when the temperature of the adjacent battery cell far from the heat source is less than the target battery cell temperature t is less than the temperature of the adjacent battery cell close to the heat source, the temperature change relationship between the target battery cell and the adjacent battery cell is judged to be in accordance with the preset temperature relationship, otherwise, the temperature change relationship between the target battery cell and the adjacent battery cell is judged to be not in accordance with the preset temperature relationship.
10. The method of claim 7, further comprising:
judging whether the temperature of a battery monomer positioned in the center of the array exceeds the upper limit value of the monomer temperature;
if the upper limit value of the monomer temperature is not exceeded, calculating a temperature difference value between the temperature of the battery monomer positioned in the center of the array and the temperature of the battery monomer positioned at the edge of the array;
judging whether the temperature difference exceeds a preset battery pack temperature difference value, if not, judging that the temperature of the battery cell is normal, and if so, judging that the temperature of the battery cell is abnormal.
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