CN114447455A - Temperature measuring method and device - Google Patents
Temperature measuring method and device Download PDFInfo
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- CN114447455A CN114447455A CN202210126435.5A CN202210126435A CN114447455A CN 114447455 A CN114447455 A CN 114447455A CN 202210126435 A CN202210126435 A CN 202210126435A CN 114447455 A CN114447455 A CN 114447455A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000001514 detection method Methods 0.000 claims abstract description 60
- 238000004088 simulation Methods 0.000 claims description 16
- 238000009529 body temperature measurement Methods 0.000 description 13
- 239000000306 component Substances 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 238000011217 control strategy Methods 0.000 description 3
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
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- 229910001416 lithium ion Inorganic materials 0.000 description 2
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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
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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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Abstract
The application provides a temperature measuring method and device, which are used for obtaining a first temperature and a second temperature of a first battery pack; the first battery pack comprises a plurality of first battery cells, the plurality of first battery cells comprise a first target battery cell, and a temperature measuring element is arranged in the first target battery cell; the first temperature is the temperature in the first target battery cell obtained by the temperature measuring element, and the second temperature is the temperature of a first detection point outside the plurality of first battery cells in the first battery pack; determining the corresponding relation between the first temperature and the second temperature; and after the third temperature of the second battery pack is obtained, determining a fourth temperature corresponding to the third temperature through the corresponding relation, wherein the fourth temperature is used as the predicted temperature inside the second target battery cell. This application can determine the inside temperature of electric core through the temperature of the check point outside electric core in the battery package to utilize the inside temperature of electric core to reflect the temperature of battery package, and then guarantee that electric core is in healthy operating temperature all the time, promote the security and the reliability of electric core.
Description
Technical Field
The present disclosure relates to the field of batteries, and more particularly, to a temperature measurement method and apparatus.
Background
With the improvement of living standards, people are beginning to use various batteries (battery packs) more and more in daily life. For example, a power battery is used as a core component of an electric vehicle, and a lithium ion battery (lithium ion battery pack) has the beneficial characteristics of long service life, high specific energy, low self-discharge rate, high power and the like, and has become a mainstream application system in the development of the power battery. In the composition structure, the battery pack may be composed of a plurality of modules, and one module may be composed of a plurality of cells.
In order to ensure safe use of the battery pack, the temperature of the battery pack needs to be measured in a certain manner, so as to ensure that the battery pack is at a healthy working temperature. In the prior art, temperature collection points are required to be arranged at different positions in the battery pack for monitoring the temperature of the battery pack, and normal temperature collection points are usually arranged on a pole, an upper cover or a bus bar for detecting the temperature of the battery pack. However, the temperature measured by this method does not truly reflect the temperature of the battery pack, and there is a large measurement error.
Disclosure of Invention
In view of this, an object of the present application is to provide a temperature measurement method, which ensures that a battery cell is always at a healthy working temperature, and improves the safety and reliability of the battery cell. The specific scheme is as follows:
in a first aspect, the present application provides a temperature measurement method, including:
acquiring a first temperature and a second temperature of a first battery pack; the first battery pack comprises a plurality of first battery cells, the plurality of first battery cells comprise a first target battery cell, and a temperature measuring element is arranged in the first target battery cell; the first temperature is the temperature inside the first target battery cell obtained by the temperature measuring element, and the second temperature is the temperature of a first detection point outside the plurality of first battery cells in the first battery pack;
determining a corresponding relation between the first temperature and the second temperature;
after the third temperature of the second battery pack is obtained, determining a fourth temperature corresponding to the third temperature through the corresponding relation; the second battery pack comprises a plurality of second cells, the plurality of second cells comprises a second target cell, and the position of the second target cell in the second battery pack is consistent with the position of the first target cell in the first battery pack; the third temperature is a temperature of a second detection point located outside the plurality of second battery cells in the second battery pack, a position of the first detection point in the first battery pack is consistent with a position of the second detection point in the second battery pack, and the fourth temperature is a predicted temperature inside the second target battery cell.
Optionally, before the obtaining the first temperature and the second temperature of the first battery pack, the method further includes:
acquiring the temperature field distribution of the first battery pack through simulation; the first target cell is located at a position where a temperature in the first battery pack is highest.
Optionally, before the obtaining the first temperature and the second temperature of the first battery pack, the method further includes:
acquiring temperature field distribution inside the first target battery cell through simulation; the temperature measuring element is located at a position of the first target electric core where the temperature is highest.
Optionally, the first detection point is located on at least one of: pole, busbar, cover plate, then the second temperature is any one or more of following temperature: the temperature of the pole, the temperature of the busbar and the temperature of the cover plate.
Optionally, the second detection point is located on a plurality of the following components: pole, busbar, apron, then the third temperature is a plurality of arbitrary of following temperature: the temperature of the pole, the temperature of the busbar and the temperature of the cover plate, wherein the fourth temperature corresponds to the third temperature; the method further comprises the following steps:
and acquiring the predicted temperature of the second target battery cell, wherein the predicted temperature is the highest temperature among the plurality of fourth temperatures.
Optionally, the third temperature is acquired when the second battery pack is in a first working condition, and the first temperature and the second temperature are acquired when the first battery pack is in the first working condition; the first working condition comprises at least one of a first room temperature, a first electric quantity value and a first charge-discharge rate state.
Optionally, the method further comprises:
and when the fourth temperature is greater than a threshold value, determining that the second battery pack needs to be cooled.
In a second aspect, an embodiment of the present application further provides a temperature measurement device, including:
the acquisition unit is used for acquiring a first temperature and a second temperature of the first battery pack; the first battery pack comprises a plurality of first battery cells, the plurality of first battery cells comprise a first target battery cell, and a temperature measuring element is arranged in the first target battery cell; the first temperature is the temperature inside the first target battery cell obtained by the temperature measuring element, and the second temperature is the temperature of a first detection point outside the plurality of first battery cells in the first battery pack;
the analysis unit is used for determining the corresponding relation between the first temperature and the second temperature;
the determining unit is used for determining a fourth temperature corresponding to a third temperature through the corresponding relation after the third temperature of a second battery pack is obtained; the second battery pack comprises a plurality of second cells, the plurality of second cells comprises a second target cell, and the position of the second target cell in the second battery pack is consistent with the position of the first target cell in the first battery pack; the third temperature is a temperature of a second detection point located outside the plurality of second battery cells in the second battery pack, a position of the first detection point in the first battery pack is consistent with a position of the second detection point in the second battery pack, and the fourth temperature is a predicted temperature inside the second target battery cell.
Optionally, the obtaining unit is further configured to: acquiring the temperature field distribution of the first battery pack through simulation; the first target cell is located at a position where a temperature in the first battery pack is highest.
Optionally, the obtaining unit is further configured to:
acquiring temperature field distribution inside the first target battery cell through simulation; the temperature measuring element is located at a position of the first target electric core where the temperature is highest.
Optionally, the first detection point is located on at least one of: the second temperature is any one or more of the following temperatures: the temperature of the pole, the temperature of the busbar and the temperature of the cover plate.
Optionally, the second detection point is located on a plurality of the following components: pole, busbar, apron, then the third temperature is a plurality of arbitrary of following temperature: the temperature of the pole, the temperature of the busbar and the temperature of the cover plate, wherein the fourth temperature corresponds to the third temperature; the apparatus is further configured to:
and acquiring the predicted temperature of the second target battery cell, wherein the predicted temperature is the highest temperature among the plurality of fourth temperatures.
Optionally, the third temperature is acquired when the second battery pack is in a first working condition, and the first temperature and the second temperature are acquired when the first battery pack is in the first working condition; the first working condition comprises at least one of a first room temperature, a first electric quantity value and a first charge-discharge rate state.
Optionally, the apparatus further comprises:
and the cooling unit is used for determining that the second battery pack needs to be cooled when the fourth temperature is greater than a threshold value.
The embodiment of the application provides a temperature measuring method, which comprises the steps of obtaining a first temperature and a second temperature of a first battery pack; the first battery pack comprises a plurality of first battery cells, the plurality of first battery cells comprise a first target battery cell, and a temperature measuring element is arranged in the first target battery cell; the first temperature is the temperature in the first target battery cell obtained by the temperature measuring element, and the second temperature is the temperature of a first detection point outside the plurality of first battery cells in the first battery pack; determining the corresponding relation between the first temperature and the second temperature; after the third temperature of the second battery pack is obtained, determining a fourth temperature corresponding to the third temperature through the corresponding relation; the second battery pack comprises a plurality of second battery cells, the plurality of second battery cells comprise a second target battery cell, and the position of the second target battery cell in the second battery pack is consistent with the position of the first target battery cell in the first battery pack; the third temperature is the temperature of a second detection point outside a plurality of second battery cells in the second battery pack, the position of the first detection point in the first battery pack is consistent with the position of the second detection point in the second battery pack, and the fourth temperature is used as the predicted temperature inside the second target battery cell. It can be seen that, in the present application, the first temperature is a temperature inside the first target electrical core obtained by using the temperature measuring element, the second temperature is a temperature at a first detection point located outside the plurality of first electrical cores in the first battery pack, and by determining a corresponding relationship between the first temperature and the second temperature, a fourth temperature corresponding to the third temperature can be determined by using the corresponding relationship. This application can determine the inside temperature of electric core through the temperature of the check point outside electric core in the battery package, that is to say, the temperature of inside electric core is acquireed in the temperature monitoring through outside check point to utilize the inside temperature reflection battery package of electric core's temperature, can reflect the true temperature of battery package more accurately, and then guarantee that electric core is in healthy operating temperature all the time, promote the security and the reliability of electric core.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart illustrating a temperature measurement method provided by an embodiment of the present application;
fig. 2 illustrates a schematic structural diagram of a target cell provided in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a temperature measuring device according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways than those described herein, and it will be apparent to those of ordinary skill in the art that the present application is not limited by the specific embodiments disclosed below.
As described in the background art, in the prior art, temperature collection points are required to be arranged at different positions inside the battery pack for monitoring the temperature of the battery pack, and normal temperature collection points are usually arranged on the poles, the upper cover or the bus bars for detecting the temperature of the battery pack. However, the inventor finds that under actual use conditions, especially under high-power discharge conditions, the temperature rise inside the battery cell is higher than the temperature of the surface of the external pole or the housing, which may cause the battery cell to be actually in a high-temperature working state under some conditions, and the actual temperature data of the battery cell cannot be acquired through an external temperature point. The temperature measured by this method does not truly reflect the temperature of the battery pack, and there is a large measurement error.
Based on the above technical problem, an embodiment of the present application provides a temperature measurement method, which obtains a first temperature and a second temperature of a first battery pack; the first battery pack comprises a plurality of first battery cells, the plurality of first battery cells comprise a first target battery cell, and a temperature measuring element is arranged in the first target battery cell; the first temperature is the temperature in the first target battery cell obtained by the temperature measuring element, and the second temperature is the temperature of a first detection point outside the plurality of first battery cells in the first battery pack; determining the corresponding relation between the first temperature and the second temperature; after the third temperature of the second battery pack is obtained, determining a fourth temperature corresponding to the third temperature through the corresponding relation; the second battery pack comprises a plurality of second battery cells, the plurality of second battery cells comprise a second target battery cell, and the position of the second target battery cell in the second battery pack is consistent with the position of the first target battery cell in the first battery pack; the third temperature is the temperature of a second detection point outside a plurality of second battery cells in the second battery pack, the position of the first detection point in the first battery pack is consistent with the position of the second detection point in the second battery pack, and the fourth temperature is used as the predicted temperature inside the second target battery cell. It can be seen that, in the present application, the first temperature is a temperature inside the first target electrical core obtained by using the temperature measuring element, the second temperature is a temperature at a first detection point located outside the plurality of first electrical cores in the first battery pack, and by determining a corresponding relationship between the first temperature and the second temperature, a fourth temperature corresponding to the third temperature can be determined by using the corresponding relationship. This application can determine the inside temperature of electric core through the temperature of the check point outside electric core in the battery package, that is to say, the temperature of inside electric core is acquireed in the temperature monitoring through outside check point to utilize the inside temperature reflection battery package of electric core's temperature, can reflect the true temperature of battery package more accurately, and then guarantee that electric core is in healthy operating temperature all the time, promote the security and the reliability of electric core.
For the convenience of understanding, a temperature measurement method and a temperature measurement device provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.
Referring to fig. 1, a flow chart of a temperature measurement method provided in an embodiment of the present application may include the following steps.
S101, acquiring a first temperature and a second temperature of a first battery pack.
In an embodiment of the present application, a first battery pack includes a plurality of first cells. Specifically, first battery package can be become by at least one module, has a plurality of first electric core regular spread in every module, and every first electric core has positive post and negative pole post, realizes the electricity through installing the busbar on the utmost point post between a plurality of first electric cores in single module. Each module still includes the apron, is located a plurality of first electric cores's the higher authority.
In this embodiment of the application, a first temperature and a second temperature of the first battery pack may be obtained, where the first temperature is a temperature inside the first target electrical core obtained by the temperature measuring element, and the second temperature is a temperature of a first detection point located outside the plurality of first electrical cores in the first battery pack. The first detection point is located on at least one of the following components: a pole column, a bus bar and a cover plate; the second temperature is any one or more of the following temperatures: the temperature of the pole, the temperature of the busbar and the temperature of the cover plate. For example, the second temperature may be a temperature of the pole, may be a temperature of the bus bar, and may be a temperature of the cover plate. Because the temperature measuring element is not arranged inside the battery cell in the prior art, the temperature inside the battery cell cannot be obtained, the temperature inside the battery cell and the temperature of components except the battery cells in the battery pack have a corresponding relation when the battery cells are arranged regularly, the first temperature and the second temperature of the first battery pack can be obtained by the corresponding relation, and therefore the temperature inside the battery cell corresponding to the temperature of the first detection point can be obtained through the corresponding relation.
In the embodiment of the present application, the first target battery cell is different from other battery cells only in that a temperature measuring element is disposed inside the battery cell, and the first target battery cell is placed in a normal group packaging manner. The plurality of first cells includes a first target cell having a temperature measuring element disposed therein for measuring a temperature within the cell, such as a thermocouple element. Fig. 2 is a schematic view of a target cell according to an embodiment of the present disclosure. The target cell is provided with a positive pole and a negative pole, a thermocouple element is arranged in the target cell, and the temperature in the cell is measured through two leads of the thermocouple element.
S102, determining the corresponding relation between the first temperature and the second temperature.
In the embodiment of the application, the corresponding relation between the first temperature and the second temperature is determined. Specifically, a Charge and discharge test can be performed on the battery system, and temperature data under different working conditions, such as different temperatures, different residual capacities (states of Charge, SOC), and different Charge and discharge rates, are collected. And corresponding the temperature data in the first target battery cell acquired by the temperature measuring element with the temperature acquired at the detection point to form a temperature correction curve. For example, when the temperature inside the first target battery cell is 45 degrees celsius and the second temperature is the temperature of the bus bar, specifically 40 degrees celsius, the corresponding relationship between the two is determined.
And S103, after the third temperature of the second battery pack is obtained, determining a fourth temperature corresponding to the third temperature through the corresponding relation.
In an embodiment of the present application, the second battery pack includes a plurality of second battery cells, where the plurality of second battery cells includes a second target battery cell, and a position of the second target battery cell in the second battery pack is identical to a position of the first target battery cell in the first battery pack; the third temperature is the temperature of a second detection point outside a plurality of second battery cells in the second battery pack, the position of the first detection point in the first battery pack is consistent with the position of the second detection point in the second battery pack, and the fourth temperature is used as the predicted temperature inside the second target battery cell.
Specifically, the second detection point is located on at least one of the following components: the second detection point can be one, and then the third temperature can be one, such as the temperature of the busbar. For example, when the temperature data obtained at the detection point arranged on the bus bar is T0，T0The temperature in the second target battery cell is not reflected, and T is utilized through the corresponding relation0The temperature T inside the second target cell may be mapped1Thus can be represented by T1And as a judgment basis, the battery cell is enabled to work at a more proper temperature by using a temperature control strategy.
Specifically, there may be a plurality of second detection points, and the third temperature may also be a plurality of, for example, the temperature of the terminal and the temperature of the bus bar. The third temperature is any plurality of the following temperatures: the temperature of the pole, the temperature of the busbar and the temperature of the cover plate, wherein the fourth temperature corresponds to the third temperature, the predicted temperature of the second target battery cell can be obtained, and the predicted temperature is the highest temperature among the fourth temperatures. Specifically, when the third temperature is multiple, multiple fourth temperatures may be determined according to multiple corresponding relationships, where the third temperature is the temperature of the terminal and the temperature of the cover plate, and since there is one corresponding relationship between the temperature of the terminal and the temperature inside the target battery cell and there is another corresponding relationship between the temperature of the cover plate and the temperature inside the target battery cell, two fourth temperatures may be obtained according to the two corresponding relationships, the temperature with the highest value among the two fourth temperatures may be the predicted temperature of the second target battery cell, and the average value of the two fourth temperatures may also be used as the predicted temperature of the second target battery cell, which may more accurately obtain the predicted temperature of the second target battery cell.
In the embodiment of the application, the third temperature is acquired when the second battery pack is in the first working condition, and the first temperature and the second temperature are acquired when the first battery pack is in the first working condition; the first working condition comprises at least one of a first room temperature, a first electric quantity value and a first charge-discharge rate state. Specifically, the acquisition of the third temperature and the acquisition of the first temperature are performed under the same condition. Different working conditions correspond to different corresponding relations, after the third temperature of the second battery pack is obtained, the corresponding relation in the working condition state can be searched according to the working condition of the third temperature during collection, and then the fourth temperature is obtained according to the corresponding relation. For example, the first operating condition may be room temperature 25 degrees celsius, an electric quantity value of 50, and a charge-discharge rate of 2C.
In this embodiment of the application, the corresponding relationship between the first temperature and the second temperature may also be loaded into the control system as a temperature control strategy, so that a fourth temperature corresponding to the third temperature is obtained through the corresponding relationship, that is, the temperature inside the second target battery cell in the second battery pack, and the temperature inside the second target battery cell is used as a determination basis to control the operation of the system, thereby ensuring that the system operates in the most rated temperature environment, and ensuring that the system is in the proper temperature environment. The acquired matrixing corresponding relation data are loaded into the control system, and the fourth temperature is correspondingly obtained through the third temperature according to the corresponding relation, so that the temperature inside the second target battery cell is obtained correspondingly, and the system is controlled through the temperature inside the second target battery cell.
In the embodiment of the application, before the first temperature and the second temperature of the first battery pack are obtained, the temperature field distribution of the first battery pack can be obtained through simulation; the first target battery cell is located at the position with the highest temperature in the first battery pack, so that the first target battery cell is located at the position with the highest temperature, and the corresponding relation can be obtained more accurately. Specifically, the temperature distribution of the battery pack under the working condition is simulated through a simulation technology, and the first target battery cell is placed at the position with the highest simulation result temperature according to a normal pack packaging mode.
In the embodiment of the application, before the first temperature and the second temperature of the first battery pack are obtained, the temperature field distribution inside the first target battery cell can be obtained through simulation; the temperature measuring element is located at the position with the highest temperature in the first target battery cell, and the temperature in the first target battery cell can be acquired more accurately. If the highest temperature inside the battery cell is within a reasonable temperature range, the battery cell works within the reasonable temperature range. Specifically, the distribution of the cell temperature field of the first target cell in the charging process is simulated through a simulation technology, the temperature measuring element is placed according to a simulation result, the temperature collecting point of the temperature measuring element is arranged at the highest position of the temperature rise in the first target cell, and the temperature collecting point can be guaranteed to obtain the highest temperature in the first target cell.
In the embodiment of the present application, when the fourth temperature is greater than the threshold value, it is determined that the second battery pack needs to be subjected to the cooling process. Specifically, can be at utmost point post, apron or busbar position set up the collection temperature point at module design in-process, carry out the collection of temperature according to this to through judging the temperature of gathering, obtain the inside temperature of electric core through corresponding relation, can regard as the identification information of thermal management, when the fourth temperature is greater than the threshold value, control system carries out cooling treatment to the battery package. In addition, when the fourth temperature is less than the preset value, the battery pack may be subjected to a heating process.
In this application embodiment, acquire the temperature of inside electric core through the control of outside temperature point, through setting up the temperature control strategy, can the safety risk of identification system, provide early warning in advance, guarantee that electric core is in healthy operating temperature all the time, promote the security and the reliability of electric core. The real temperature of the battery in the internal battery cell under the working state can be evaluated, the battery can be determined to be at the healthy working temperature, the internal temperature of the battery cell in the battery can be identified more accurately, and the temperature of an external temperature collection point is corrected according to the strategy information acquired in advance.
The embodiment of the application provides a temperature measuring method, which comprises the steps of obtaining a first temperature and a second temperature of a first battery pack; the first battery pack comprises a plurality of first battery cells, the plurality of first battery cells comprise a first target battery cell, and a temperature measuring element is arranged in the first target battery cell; the first temperature is the temperature in the first target battery cell obtained by the temperature measuring element, and the second temperature is the temperature of a first detection point outside the plurality of first battery cells in the first battery pack; determining the corresponding relation between the first temperature and the second temperature; after the third temperature of the second battery pack is obtained, determining a fourth temperature corresponding to the third temperature through the corresponding relation; the second battery pack comprises a plurality of second battery cells, the plurality of second battery cells comprise a second target battery cell, and the position of the second target battery cell in the second battery pack is consistent with the position of the first target battery cell in the first battery pack; the third temperature is the temperature of a second detection point outside a plurality of second battery cells in the second battery pack, the position of the first detection point in the first battery pack is consistent with the position of the second detection point in the second battery pack, and the fourth temperature is used as the predicted temperature inside the second target battery cell. It can be seen that, in the present application, the first temperature is a temperature inside the first target electrical core obtained by using the temperature measuring element, the second temperature is a temperature at a first detection point located outside the plurality of first electrical cores in the first battery pack, and by determining a corresponding relationship between the first temperature and the second temperature, a fourth temperature corresponding to the third temperature can be determined by using the corresponding relationship. This application can determine the inside temperature of electric core through the temperature of the check point outside electric core in the battery package, that is to say, the temperature of inside electric core is acquireed in the temperature monitoring through outside check point to utilize the inside temperature reflection battery package of electric core's temperature, can reflect the true temperature of battery package more accurately, and then guarantee that electric core is in healthy operating temperature all the time, promote the security and the reliability of electric core.
Based on the above temperature measurement method, an embodiment of the present application further provides a temperature measurement device, which is shown in fig. 3 as a schematic structural diagram of the temperature measurement device provided in the embodiment of the present application, and the temperature measurement device may include:
an obtaining unit 100, configured to obtain a first temperature and a second temperature of a first battery pack; the first battery pack comprises a plurality of first battery cells, the plurality of first battery cells comprise a first target battery cell, and a temperature measuring element is arranged in the first target battery cell; the first temperature is the temperature inside the first target battery cell obtained by the temperature measuring element, and the second temperature is the temperature of a first detection point outside the plurality of first battery cells in the first battery pack;
an analysis unit 200, configured to determine a corresponding relationship between the first temperature and the second temperature;
the determining unit 300 is configured to determine, after acquiring a third temperature of a second battery pack, a fourth temperature corresponding to the third temperature according to the corresponding relationship; the second battery pack comprises a plurality of second cells, the plurality of second cells comprises a second target cell, and the position of the second target cell in the second battery pack is consistent with the position of the first target cell in the first battery pack; the third temperature is a temperature of a second detection point located outside the plurality of second battery cells in the second battery pack, a position of the first detection point in the first battery pack is consistent with a position of the second detection point in the second battery pack, and the fourth temperature is a predicted temperature inside the second target battery cell.
Optionally, the obtaining unit is further configured to:
acquiring the temperature field distribution of the first battery pack through simulation; the first target cell is located at a position where a temperature in the first battery pack is highest.
Optionally, the obtaining unit is further configured to:
acquiring temperature field distribution inside the first target battery cell through simulation; the temperature measuring element is located at a position of the first target electric core where the temperature is highest.
Optionally, the first detection point is located on at least one of: the second temperature is any one or more of the following temperatures: the temperature of the pole, the temperature of the busbar and the temperature of the cover plate.
Optionally, the second detection point is located on a plurality of the following components: pole, busbar, apron, then the third temperature is a plurality of arbitrary of following temperature: the temperature of the pole, the temperature of the busbar and the temperature of the cover plate, wherein the fourth temperature corresponds to the third temperature; the apparatus is further configured to:
and acquiring the predicted temperature of the second target battery cell, wherein the predicted temperature is the highest temperature among the plurality of fourth temperatures.
Optionally, the third temperature is acquired when the second battery pack is in a first working condition, and the first temperature and the second temperature are acquired when the first battery pack is in the first working condition; the first working condition comprises at least one of a first room temperature, a first electric quantity value and a first charge-discharge rate state.
Optionally, the apparatus further comprises:
and the cooling unit is used for determining that the second battery pack needs to be cooled when the fourth temperature is greater than a threshold value.
The embodiment of the application provides a temperature measuring device, which comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring a first temperature and a second temperature of a first battery pack; the first battery pack comprises a plurality of first battery cells, the plurality of first battery cells comprise a first target battery cell, and a temperature measuring element is arranged in the first target battery cell; the first temperature is the temperature in the first target battery cell obtained by the temperature measuring element, and the second temperature is the temperature of a first detection point outside the plurality of first battery cells in the first battery pack; the analysis unit is used for determining the corresponding relation between the first temperature and the second temperature; the determining unit is used for determining a fourth temperature corresponding to the third temperature through the corresponding relation after the third temperature of the second battery pack is obtained; the second battery pack comprises a plurality of second battery cells, the plurality of second battery cells comprise a second target battery cell, and the position of the second target battery cell in the second battery pack is consistent with the position of the first target battery cell in the first battery pack; the third temperature is the temperature of a second detection point outside a plurality of second battery cells in the second battery pack, the position of the first detection point in the first battery pack is consistent with the position of the second detection point in the second battery pack, and the fourth temperature is used as the predicted temperature inside the second target battery cell. In this application, the first temperature is a temperature inside the first target electrical core obtained by using the temperature measuring element, the second temperature is a temperature at a first detection point located outside the plurality of first electrical cores in the first battery pack, and by determining a correspondence between the first temperature and the second temperature, a fourth temperature corresponding to the third temperature can be determined by using the correspondence. This application can determine the inside temperature of electric core through the temperature of the check point outside electric core in the battery package, that is to say, the temperature of inside electric core is acquireed in the temperature monitoring through outside check point to utilize the inside temperature reflection battery package of electric core's temperature, can reflect the true temperature of battery package more accurately, and then guarantee that electric core is in healthy operating temperature all the time, promote the security and the reliability of electric core.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points.
The foregoing is merely a preferred embodiment of the present application and, although the present application discloses the foregoing preferred embodiments, the present application is not limited thereto. Those skilled in the art can now make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the protection scope of the technical solution of the present application without departing from the content of the technical solution of the present application.
Claims (10)
1. A method of measuring temperature, comprising:
acquiring a first temperature and a second temperature of a first battery pack; the first battery pack comprises a plurality of first battery cells, the plurality of first battery cells comprise a first target battery cell, and a temperature measuring element is arranged in the first target battery cell; the first temperature is the temperature inside the first target battery cell obtained by the temperature measuring element, and the second temperature is the temperature of a first detection point outside the plurality of first battery cells in the first battery pack;
determining a corresponding relation between the first temperature and the second temperature;
after the third temperature of the second battery pack is obtained, determining a fourth temperature corresponding to the third temperature through the corresponding relation; the second battery pack comprises a plurality of second cells, the plurality of second cells comprises a second target cell, and the position of the second target cell in the second battery pack is consistent with the position of the first target cell in the first battery pack; the third temperature is a temperature of a second detection point located outside the plurality of second battery cells in the second battery pack, a position of the first detection point in the first battery pack is consistent with a position of the second detection point in the second battery pack, and the fourth temperature is a predicted temperature inside the second target battery cell.
2. The method of claim 1, wherein prior to said obtaining the first and second temperatures of the first battery pack, the method further comprises:
acquiring the temperature field distribution of the first battery pack through simulation; the first target cell is located at a position where a temperature in the first battery pack is highest.
3. The method of claim 1, wherein prior to said obtaining the first and second temperatures of the first battery pack, the method further comprises:
acquiring temperature field distribution inside the first target battery cell through simulation; the temperature measuring element is located at a position of the first target electric core where the temperature is highest.
4. A method according to any of claims 1-3, characterized in that the first detection point is located on at least one of the following components: pole, busbar, cover plate, then the second temperature is any one or more of following temperature: the temperature of the pole, the temperature of the busbar and the temperature of the cover plate.
5. The method of claim 4, wherein the second detection point is located on a plurality of: pole, busbar, apron, then the third temperature is a plurality of arbitrary of following temperature: the temperature of the pole, the temperature of the busbar and the temperature of the cover plate, wherein the fourth temperature corresponds to the third temperature; the method further comprises the following steps:
and acquiring the predicted temperature of the second target battery cell, wherein the predicted temperature is the highest temperature among the plurality of fourth temperatures.
6. The method of any one of claims 1-3, wherein the third temperature is collected when the second battery pack is in a first operating condition, and the first temperature and the second temperature are collected when the first battery pack is in the first operating condition; the first working condition comprises at least one of a first room temperature, a first electric quantity value and a first charge-discharge rate state.
7. The method according to any one of claims 1-3, further comprising:
and when the fourth temperature is greater than a threshold value, determining that the second battery pack needs to be cooled.
8. A temperature measuring device, comprising:
the acquisition unit is used for acquiring a first temperature and a second temperature of the first battery pack; the first battery pack comprises a plurality of first battery cells, the plurality of first battery cells comprise a first target battery cell, and a temperature measuring element is arranged in the first target battery cell; the first temperature is the temperature inside the first target battery cell obtained by the temperature measuring element, and the second temperature is the temperature of a first detection point outside the plurality of first battery cells in the first battery pack;
the analysis unit is used for determining the corresponding relation between the first temperature and the second temperature;
the determining unit is used for determining a fourth temperature corresponding to a third temperature through the corresponding relation after the third temperature of a second battery pack is obtained; the second battery pack comprises a plurality of second cells, the plurality of second cells comprises a second target cell, and the position of the second target cell in the second battery pack is consistent with the position of the first target cell in the first battery pack; the third temperature is a temperature of a second detection point located outside the plurality of second battery cells in the second battery pack, a position of the first detection point in the first battery pack is consistent with a position of the second detection point in the second battery pack, and the fourth temperature is a predicted temperature inside the second target battery cell.
9. The apparatus of claim 8, wherein the obtaining unit is further configured to:
acquiring the temperature field distribution of the first battery pack through simulation; the first target cell is located at a position where a temperature in the first battery pack is highest.
10. The apparatus of claim 8, wherein the obtaining unit is further configured to:
acquiring temperature field distribution inside the first target battery cell through simulation; the temperature measuring element is located at a position of the first target electric core where the temperature is highest.
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| CN116306032A (en) * | 2023-05-17 | 2023-06-23 | 宁德时代新能源科技股份有限公司 | Temperature prediction method, device, equipment and storage medium |
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