CN115795256A - Method, device and equipment for determining heating time of battery pack and storage medium - Google Patents
Method, device and equipment for determining heating time of battery pack and storage medium Download PDFInfo
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- CN115795256A CN115795256A CN202211216924.6A CN202211216924A CN115795256A CN 115795256 A CN115795256 A CN 115795256A CN 202211216924 A CN202211216924 A CN 202211216924A CN 115795256 A CN115795256 A CN 115795256A
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Abstract
The application is suitable for the field of batteries, and provides a method, a device, equipment and a storage medium for determining the heating time of a battery pack, wherein the method comprises the following steps: monitoring state information of the battery pack; when the state information meets the first heating state, determining the actual heating parameters of the battery pack; determining the total time length to be heated of the battery pack in the first heating state according to the actual heating parameters and the preset corresponding relation; the preset corresponding relation is the corresponding relation between the heating parameters and the heating time; heating the battery pack and accumulating the heating time; when the battery pack is changed from the first heating state to the second heating state, determining the remaining time length to be heated of the battery pack during state transition according to the total time length to be heated and the accumulated heating time length; and after the battery pack enters the second heating state, adjusting the residual time length to be heated according to the current temperature of the battery pack to obtain the real-time length to be heated of the battery pack. The method and the device can improve the accuracy of estimation of the heating time of the battery pack.
Description
Technical Field
The application belongs to the technical field of new energy, and particularly relates to a method, a device, equipment and a storage medium for determining heating time of a battery pack.
Background
The current application scenes of the energy storage battery are wide, and the energy storage battery can be used in various devices, particularly energy storage devices. Due to the low-temperature characteristic of the battery, when the temperature of the battery is low, the battery under the low-temperature working condition needs to be heated firstly, so that the battery can be charged/discharged. In this process, a determination of the length of time the battery has been heated is needed so that the user is better aware of when the device is working properly.
However, during the heating process, the temperature change of the battery is affected by many factors, so that it is difficult to accurately calculate the heating time period of the battery.
Disclosure of Invention
The embodiment of the application provides a method for determining the heating time of a battery pack, a device for determining the heating time of the battery pack, an energy storage device and a storage medium, and aims to solve the problem that the heating time of the battery pack is difficult to accurately calculate.
A first aspect of an embodiment of the present application provides a method for determining a heating time period of a battery pack, where the method includes:
monitoring state information of the battery pack;
when the state information meets a first heating state, determining actual heating parameters of the battery pack;
determining the total time length to be heated of the battery pack in the first heating state according to the actual heating parameters and a preset corresponding relation; the preset corresponding relation is the corresponding relation between the heating parameters and the heating duration;
heating the battery pack and accumulating the heating time;
when the battery pack is changed from a first heating state to a second heating state, determining the remaining time length to be heated of the battery pack during state transition according to the total time length to be heated and the accumulated heating time length;
and after the battery pack enters a second heating state, adjusting the residual time length to be heated according to the current temperature of the battery pack to obtain the real-time length to be heated of the battery pack.
The second aspect of the embodiments of the present application further provides a device for determining a heating time period of a battery pack, where the method includes:
the state information monitoring module is used for monitoring the state information of the battery pack;
the heating parameter determining module is used for determining the actual heating parameters of the battery pack when the state information meets a first heating state;
a total duration determining module, configured to determine, according to the actual heating parameter and a preset corresponding relationship, a total duration to be heated of the battery pack in the first heating state; the preset corresponding relation is the corresponding relation between the heating parameters and the heating duration;
the accumulated time length determining module is used for heating the battery pack and accumulating the heating time length;
the remaining time length determining module is used for determining the remaining time length to be heated of the battery pack during state transition according to the total time length to be heated and the accumulated heating time length when the battery pack is changed from a first heating state to a second heating state;
and the remaining time length adjusting module is used for adjusting the remaining time length to be heated according to the current temperature of the battery pack after the battery pack enters a second heating state, so as to obtain the real-time length to be heated of the battery pack.
A third aspect of the embodiments of the present application further provides an energy storage device, where the energy storage device includes a battery pack and a controller, and the controller is configured to implement the method for determining a heating time period of the battery pack when executing a computer program stored in a memory.
The fourth aspect of the embodiments of the present application further provides a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a controller, the method for determining a heating time period of a battery pack is implemented.
In the embodiment of the application, because the temperature change of the battery pack in the heating process is greatly influenced by the heating state, the heating state met by the battery pack is determined by monitoring the state information of the battery pack, so that the heating time length determining modes in different heating states are distinguished, when the battery pack enters the second heating state from the first heating state, the determined residual heating time length during the heating state transition is adjusted according to the current temperature of the battery pack, and the obtained real-time heating time length is obtained. The calculation mode of the heating time length is adjusted in time according to different heating states, and the accuracy of the time length to be heated of the battery pack can be improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only 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 schematic flow chart of a method for determining a heating time period of a battery pack according to an embodiment of the present application;
fig. 2 is a schematic flowchart of a method for determining status information of a battery pack according to an embodiment of the present disclosure;
fig. 3 is a schematic flow chart of a remaining heating time period adjusting method provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a device for determining a heating time period of a battery pack according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an energy storage device provided in an embodiment of the present application.
Detailed Description
In order that the above objects, features and advantages of the present application can be more clearly understood, a detailed description of the present application will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, and the described embodiments are a part, but not all, of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
The method for determining the heating time of the battery pack provided by the embodiment of the invention can be executed by the energy storage device, and correspondingly, the device for determining the heating time of the battery pack runs in the energy storage device. Fig. 1 is a schematic flow chart of a method for determining a heating time period of a battery pack according to an embodiment of the present application. As shown in fig. 1, the method for determining the heating time period of the battery pack may include steps S11 to S16, and the sequence of the steps in the flowchart may be changed and some may be omitted according to different requirements.
And S11, monitoring the state information of the battery pack.
In at least one embodiment of the present application, the battery pack may be applied to self-moving devices such as an automobile device, a mowing device, a sweeping device, a mine clearing device, and a cruising device, or may be applied to energy storage devices such as a mobile energy storage device and a household energy storage device, or other electronic devices requiring an energy storage battery pack, which is not limited herein. The battery pack comprises a plurality of battery monomers, the battery monomers can be understood as electric cores, and each battery monomer has a corresponding temperature value.
It is understood that the state information of the battery pack includes, but is not limited to, temperature information, charge and discharge state information, fault information, and the like. The current working condition and the heating condition of the battery pack can be distinguished through the state information of the battery pack. Under different working conditions, the heating speed of the battery pack may be different. For example, the battery pack starts to be heated from a low temperature, and the temperature is low when the battery pack starts to be heated, so that the battery pack does not discharge or charge when standing. After the battery pack is heated to a certain temperature, the battery pack is allowed to discharge outwards or is charged by an external power supply, and then the battery pack enters a new heating state. The different states all affect the heating time of the battery pack, so that the state information of the battery pack can be monitored to further determine the estimation mode of the heating time.
And S12, determining the actual heating parameters of the battery pack when the state information meets the first heating state.
In at least one embodiment of the present application, the first heating state refers to a state in which a current temperature of the battery pack is less than a preset temperature threshold, and the battery pack is in a stationary state, and in this state, a charge and discharge loop of the battery pack is in a cut-off state. Here, the battery pack is in a resting state means that the battery pack is neither discharged nor charged. The preset temperature threshold is a preset temperature for evaluating whether the battery pack can be charged or discharged, and is generally determined by the characteristics of the battery pack, for example, charging or discharging is not allowed at 0 ℃. It can be understood that the preset temperature value can be adjusted and set according to the temperature that whether the battery pack can be charged or discharged, and is used as the charging or discharging protection temperature. For example, the preset temperature threshold may be 5 degrees celsius, below which charging or discharging of the battery pack is prohibited. And when the temperature of the battery pack is less than the preset temperature threshold value, the battery pack is not allowed to be charged or discharged. And when the temperature of the battery pack is greater than or equal to a preset temperature threshold value, allowing the battery pack to be charged or discharged.
The current temperature of the battery pack can be monitored by a temperature sensor, for example, a temperature sensor can be arranged on the surface of each battery cell of the battery pack, and the temperature value of each battery cell is monitored by the temperature sensor. In an embodiment, the temperature of the battery pack may be a temperature value corresponding to a battery cell with the highest temperature in the battery pack. In other embodiments, the temperature of the battery pack may also be a temperature value corresponding to a battery cell with the lowest temperature in the battery pack.
The heating parameters may include an initial temperature at which the battery pack starts to be heated and a heating power at which the battery pack is heat-treated. Taking the example of performing the heating treatment on the battery pack by using the heating film, the heating power may be a preset power when the heating film operates. The resistance values of the heating films adopted by the battery pack are different, and the heating powers of the heating films may be different. Even if the battery pack uses the heating film having the same resistance, the heating power may be different when the operating voltage supplied to the heating film is different. When the battery pack is heated, the actual heating power of the battery pack may be confirmed according to the real-time operating power of the heating module for heating in the battery pack, for example, the operating power of the heating film.
And S13, determining the total heating time of the battery pack in the first heating state according to the actual heating parameters and the preset corresponding relation.
In at least one embodiment of the application, a corresponding relationship between the heating parameters and the heating time is preset as a preset corresponding relationship, and the total time to be heated of the battery pack in the first heating state can be obtained according to the preset corresponding relationship which is pre-stored by traversing the actual heating parameters of the battery pack.
Still taking the heating film as an example for description, the corresponding relationship between the heating parameter and the heating time may be determined by heating the battery pack at different temperatures and different heating powers after the heating film is provided for the battery pack. For example, for the battery pack a heated from-20 degrees celsius at a power of 200W, the heating is stopped to a second preset temperature threshold (a temperature at which the heating is stopped, which is greater than the first preset temperature threshold) of the battery pack, for example, 10 degrees celsius, and the required heating time period is 112.5 minutes. Thus, the corresponding relation between different heating parameters and the heating time length can be determined.
And S14, heating the battery pack and accumulating the heating time.
In at least one embodiment of the present application, taking the example of performing a heating process on the battery pack by means of the heating film, heat is generated by the heating film and transferred to the battery pack, so that the temperature of the battery pack is increased. In one embodiment, a timer is preset, the time when the heating film starts to work is taken as a starting time point, and the heating time length of the battery pack at the current time can be calculated by accumulating the heating time length through the timer.
And S15, when the battery pack is changed from the first heating state to the second heating state, determining the remaining time length to be heated of the battery pack during state transition according to the total time length to be heated and the accumulated heating time length.
In at least one embodiment of the present application, in the first heating state, the current temperature of the battery pack is less than the preset temperature threshold, and the battery pack is in the resting state. By heat-treating the battery pack, the temperature of the battery pack gradually rises, and it is possible to enter a second heating state at a certain time. In the embodiment of the present application, the second heating state refers to a state where the battery pack is in a state where charge and discharge are allowed, and in this state, the charge and discharge circuit of the battery pack is in a conductive state. The heating state can be determined by the temperature of the battery pack, or directly by detecting the charging and discharging current of the battery pack. For example, the preset temperature threshold is a charge-discharge protection threshold of the battery pack, when the temperature of the battery pack is lower than the preset temperature threshold, a charge-discharge loop of the battery pack is cut off, otherwise, the loop is turned on. Therefore, when the temperature of the battery pack is detected to be higher than the preset temperature value, it can be indicated that the battery pack enters the second heating state. For another example, whether the battery pack is currently charged or discharged may be directly determined by detecting the charging/discharging current of the battery pack, and if the charging current or the discharging current is detected, it may also be determined that the battery pack has entered the second heating state.
Therefore, when it is detected that the current temperature of the battery pack is greater than or equal to the preset temperature threshold, or the battery pack is currently in a charging state or a discharging state, it can be indicated that the heating state of the battery pack has changed, that is, the battery pack enters the second heating state from the first heating state. At this time, the battery pack may be charged/discharged. When the battery pack enters the second heating state, the working condition of the battery pack is changed.
In one embodiment, determining the remaining time period to be heated of the battery pack at the time of state transition according to the total time period to be heated and the accumulated heating time period includes: calculating a time length difference value between the total time length to be heated and the accumulated heating time length; and taking the time length difference as the remaining time length to be heated of the battery pack when the state of the battery pack is changed. Illustratively, the total time to heat is denoted as T 0 The cumulative heating time is denoted as: [ integral ] dt, and the remaining heating time is denoted as T 1 The remaining time period to be heated may be as shown in formula 1:
T 1 ＝T 0 - [ integral ] dt formula 1
It can be understood that, in the first heating state, when the energy storage device displays the time length to be heated of the battery pack, the calculated remaining time length to be heated may be directly displayed.
And S16, after the battery pack enters the second heating state, adjusting the residual time length to be heated according to the current temperature of the battery pack to obtain the real-time length to be heated of the battery pack.
In at least one embodiment of the present application, as mentioned above, the battery pack is heated from a low temperature, and after the battery pack is heated to a certain temperature, the battery pack is allowed to discharge or charge externally, and then the battery pack enters a new heating state, that is, a second heating state. After the battery pack enters the second heating state, the battery pack enters a new working condition, and at the moment, the temperature of the battery pack is influenced by the working power of the heating film, and the working state of the battery pack also influences the temperature of the battery pack. Therefore, in the second heating state, the remaining time to be heated obtained by the battery pack in the first heating state needs to be adjusted according to the heating time determination mode in the second heating state, so as to obtain the real-time to be heated of the battery pack. In the second heating state, the time length to be heated of the battery pack changes along with the temperature of the battery pack, and the correlation between the time length to be heated and the temperature of the battery pack in different temperature intervals also changes gradually, so that in the second heating state, the remaining time length to be heated determined during the state transition needs to be further adjusted according to the current temperature to determine more accurate time length to be heated.
It can be understood that, in the second heating state, when the energy storage device displays the time length to be heated of the battery pack, the adjusted time length to be heated is displayed.
According to the method for determining the heating time of the battery pack, the heating state met by the battery pack is monitored by determining the state information of the battery pack, the state information of the battery pack is matched with the heating state to determine the heating time in each heating state, and the accuracy of confirming the heating time of the battery pack can be improved.
In at least one embodiment of the present application, the state information of the battery pack includes temperature information and charge/discharge state information. The charge and discharge state of the battery pack may include a charge state, a discharge state, and a rest state. The charging state indicates that the battery pack is in a charging process, the discharging state indicates that the battery pack is in a discharging process, and the standing state indicates that the battery pack is neither in the charging state nor in the discharging state. The different states all affect the heating duration of the battery pack, so that the state information of the battery pack can be monitored. In some embodiments, monitoring status information of the battery pack includes:
and S110, acquiring the current temperature of the battery pack.
The method comprises the following steps of taking the temperature of a battery pack as an example of a temperature value corresponding to a battery monomer with the highest temperature in the battery pack, and acquiring the current temperature of the battery pack; acquiring a temperature monitoring value monitored by each temperature sensor; and selecting the highest temperature monitoring value as the current temperature of the battery pack.
S111, acquiring the charge and discharge state of the battery pack;
the charging and discharging state can be determined according to the charging and discharging current on the charging and discharging loop of the battery pack. For example, it may be determined that the range of the charge and discharge current when the battery pack is at rest is, for example, -1A < i <1A, and when the detected current is outside the range, it may be determined that the battery pack is in a charged or discharged state. If the current flowing in the charging circuit of the battery pack is detected to be 10A, the battery pack is in a charging state. And if the current flowing on the charge-discharge loop of the battery pack is detected to be-1A, the battery pack is in a discharge state. And if the current flowing on the charge-discharge loop of the battery pack is detected to be 0.5A, the battery pack is in a standing state.
And S112, determining the state information of the battery pack according to the current temperature and the charge and discharge state.
The determining the state information may be determining a heating state that the battery pack satisfies according to the current temperature and the charge/discharge state of the battery pack, for example, satisfying the first heating state or satisfying the second heating state. It can be understood that after the current temperature and the charge-discharge state of the battery pack are obtained, the current working condition of the battery pack, for example, at what temperature to perform charging or discharging or still in a standing state, can be determined according to the obtained data, so that what heating state the battery pack currently satisfies can be determined.
Referring to fig. 2, fig. 2 is a schematic flowchart illustrating a method for determining status information of a battery pack according to an embodiment of the present disclosure. Optionally, the charge-discharge state comprises a charge state, a discharge state and a standing state; determining the state information of the battery pack according to the current temperature and the charge-discharge state, comprising the following steps:
s113, when the current temperature is lower than a preset temperature threshold value and the battery pack is in a standing state, determining that the battery pack meets a first heating state;
when the current temperature of the battery pack is smaller than a preset temperature threshold value and the battery pack is in a standing state, it is determined that the battery pack meets a first heating state. In the first heating state, the battery pack is not allowed to be charged or discharged, and the battery pack is subjected to heating treatment so as to be in a charging or discharging condition. In one embodiment, a heating film is added to the surface of the battery pack, and the heating film can generate and transfer heat to the battery pack, so that the temperature of the battery pack is increased.
And S114, when the current temperature is greater than the preset temperature threshold value or the battery pack is in a charging state or a discharging state, determining that the battery pack meets a second heating state.
When the current temperature of the battery pack is greater than or equal to a preset temperature threshold, allowing charge/discharge processing of the battery pack, and determining that the battery pack meets a second heating state; alternatively, it is determined that the battery pack satisfies the second heating state when the battery pack is in the charging state or the discharging state. Therefore, whether the battery pack enters the second heating state can be confirmed by monitoring the temperature of the battery pack, and whether the battery pack enters the second heating state can also be confirmed by detecting the charging and discharging current of the battery pack.
In some embodiments, the heating parameters include an initial temperature and a heating power; determining the total time length to be heated of the battery pack in the first heating state according to the actual heating parameters and a preset corresponding relation, wherein the determining step comprises the following steps:
s130, determining the total heating time of the battery pack in the first heating state according to the actual heating parameters and a preset corresponding relation.
The total time period to be heated may be a time period required for heating the battery pack from an initial temperature to a target heating temperature, where the target heating temperature is a preset temperature at which the heating process for the battery pack is stopped, and for example, the target heating temperature may be 10 degrees celsius. The correspondence relationship may be obtained by performing a heating test on the battery pack at different initial temperatures and different heating powers, for example, when the initial temperature of the battery pack is-20 degrees celsius, the total time period to be heated for heating the battery pack to the target heating temperature is 112.5 minutes at a heating power of 200 watts; when the initial temperature of the battery pack is-20 ℃, the total time period of waiting for heating the battery pack to the target heating temperature is 205 minutes under the heating power of 150 watts; when the initial temperature of the battery pack is-20 ℃, the total time period to be heated for heating the battery pack to the target heating temperature is 324.9 minutes under the heating power of 100 watts, which is not described herein. In an embodiment, the corresponding relationship is stored in a preset database. The database can be arranged inside the energy storage device and also can be arranged at the cloud end.
Referring to fig. 3, a method for adjusting a duration to be heated is described with reference to fig. 3. In one embodiment, adjusting the remaining time period to be heated according to the current temperature of the battery pack to obtain the real-time period to be heated of the battery pack includes:
s161, acquiring a correction function in a preset heating time interval, wherein the minimum value of the preset heating time interval is zero, and the maximum value is the residual time to be heated;
the correction function is used for adjusting the remaining time length to be heated according to the current temperature of the battery pack to obtain the alternative time length to be heated. In one embodiment, the modification function may be a linear interpolation function. In other embodiments, the modification function may also be a polynomial interpolation function, for example, the modification function may be a binomial interpolation function, a trinomial interpolation function, and the like, which is not limited herein.
S162, calculating to obtain the alternative time length to be heated according to the current temperature of the battery pack and the correction function;
and S163, before the temperature of the battery pack is obtained again, filtering the alternative time length to be heated to obtain the real-time length to be heated of the battery pack.
It will be appreciated that when the battery pack enters the second heating state, the remaining heating period is much reduced compared to the total heating period, and the change speed is much faster. At this time, if the time length to be heated is still determined by traversing the corresponding relationship between the heating parameters and the heating time length, a large error may exist. For example, at a certain stage in the first heating state, it may be determined that the time period during which the battery pack rises from 3 degrees celsius to 4 degrees celsius is relatively long by querying the correspondence and the accumulation of the heating time period, and at this time, the accumulated error may be ignored with respect to the time period, that is, in the first heating state, the remaining time period to be heated is relatively long, the above problem may be insignificant, and the determined time period to be heated is still relatively accurate. However, after the battery pack enters the second heating state, the remaining time period to be heated changes faster and faster with the temperature, and the time is shorter and shorter, if the above-mentioned manner in the first heating state is still adopted, the determined time period to be heated is prone to sudden change, and the accumulated error is particularly prominent at this time. Therefore, in the second heating state, the correction function is combined with the temperature of the battery pack to perform interpolation processing on the time length value from the residual time length to be heated to the heating stop time period, so that the accumulated errors can be averaged, and the accumulation effect of the accumulated errors can be reduced. Meanwhile, since the obtaining interval of the temperature of the battery pack is much smaller than the updating frequency of the time length to be heated, for example, the temperature is obtained every 5min, and the updating of the time length to be heated is performed every 1min. If the time length to be heated is updated each time is calculated according to the current temperature, the actual change of the time length to be heated cannot be reflected, so that the alternative time length to be heated after the last interpolation can be filtered between two times of temperature acquisition, the influence of accumulated errors can be reduced, and the change of the time length to be heated is smoother.
In the above embodiment, after the battery pack enters the second heating state, the correction function is called to correct the remaining time to be heated to obtain the alternative time to be heated, the alternative time to be heated is filtered to obtain the real-time to be heated of the battery pack, and the accuracy of determining the heating time of the battery pack can be improved by combining the correction function and the filtering.
In an embodiment, calculating the alternative time period to be heated according to the current temperature of the battery pack and the correction function includes:
s1620, obtaining the current temperature of the battery pack;
s1621, calculating the alternative time length to be heated according to the current temperature and a correction function, wherein the correction function is as follows:
wherein T is the current temperature, f (T) is the alternative time length to be heated, f 0 For the remaining length of time to be heated, T k Is a preset target heating temperature, T 0 The temperature (i.e., the preset temperature threshold) at which the battery pack enters the second heating state from the first heating state.
It can be understood that the current temperature of the battery pack can be obtained by monitoring the temperature value corresponding to the battery cell with the highest temperature in the battery pack through the temperature sensor, which is not described herein again. In the embodiment of the present application, the correction function is taken as a linear interpolation function, and the linear interpolation function can be shown as formula 2. Illustratively, the preset target heating temperature T k At 10 degrees Celsius, T 0 The temperature is 5 ℃, and when the battery pack is heated to 5 ℃, the battery pack enters a second heating state from a first heating state. f. of 0 When the battery pack is heated to 5 ℃, the remaining time to be heated is determined by inquiring the corresponding relation and accumulating the heating time, namely the remaining time to be heated required when the battery pack is heated from 5 ℃ to 10 ℃ is calculated by the estimation mode of the first heating state. The total to-be-heated time of the battery pack, which is heated from the initial temperature to 10 ℃, can be obtained by traversing the corresponding relation between the preset heating parameters and the preset heating time, the cumulative heating time integral dt, which is heated from the initial temperature to 5 ℃, is obtained, and the difference value between the total to-be-heated time and the cumulative heating time integral dt is used as the residual to-be-heated time integral from 5 ℃ to 10 ℃Duration of heating f 0 。
In an embodiment, before obtaining the temperature of the battery pack again, filtering the candidate time duration to be heated to obtain a real-time duration to be heated of the battery pack, including:
s1630, determining the descending rate of the time to be heated according to the alternative time to be heated, the acquisition time of the current temperature and the acquisition time of the last temperature of the battery pack;
s1631, before the temperature of the battery pack is obtained again, the real-time to-be-heated time length is obtained through calculation according to the descending rate of the time length to be heated and the alternative time length to be heated.
It can be understood that, in practical applications, the reporting interval of the temperature detection is much less than the update frequency of the real-time duration to be heated. For example, the temperature is reported once every 1 degree rise or every 5min, and the time length to be heated is updated every 1min. If the time length to be heated is calculated by the current temperature every time, the actual change of the time length to be heated cannot be reflected, and at the moment, the change of the time length to be heated between two temperatures can be further estimated according to the change of the time length to be heated in different temperature intervals. The change of the time length to be heated in different temperature intervals is related to the same required time for each rise of the battery pack, namely the temperature rise rate. After the battery pack enters the second heating state, in different temperature intervals, the reduction rate of the time to be heated is different when the time required by the temperature of the battery pack to rise to the same temperature is different along with the working condition. Taking the preset temperature threshold of 5 degrees Celsius and the target heating temperature of 10 degrees Celsius as an example, after entering the second heating state, the temperature range may include [5,6 ]]、[6，7]、[7，8]、[8，9]And [9, 10]And the descending rates of the time length to be heated of the battery pack are different in the different intervals. Exemplarily, assuming that the battery pack reports temperature once at 5 ℃, the current time is recorded as t 1 At this time, the time length of the alternative heating time for one time can be calculated; when the temperature of the battery pack rises to 6 ℃, reporting the temperature once, and recording the current time as t 2 At this time, the time length of one-time alternative heating can be calculated, and the temperature interval [5,6 ]]Corresponding rate of temperature riseRate T _ rate = T 2 -t 1 /1. When the temperature of the battery pack rises to 7 ℃, recording the current moment as t 3 Temperature interval [6,7 ]]Corresponding rate of temperature rise T _ rate = T 3 -t 2 /1. The preset target heating temperature is denoted as T k The predetermined temperature threshold is denoted as T 0 The temperature difference is the target heating temperature T k And a predetermined temperature threshold T 0 Difference of (i.e. T) k -T 0 . The descending rate of the current candidate heating time length can be more accurately determined according to the last temperature rising rate and the temperature difference value, that is, the descending rate is calculated according to the following formula 3:
rate＝[f(T)/(T k -T 0 )]/(T _ rate) formula 3
The T _ rate may be determined according to the last temperature of the battery pack and the current temperature acquisition time.
In an embodiment, after the decrease rate of the time length to be heated is obtained, and before the time length to be heated is calculated next time directly according to the temperature, the alternative time length to be heated obtained by the calculation may be filtered according to the decrease rate of the time length to be heated, so as to improve the accuracy of determining the heating time length of the battery pack. Optionally, before obtaining the temperature of the battery pack again, filtering the alternative time length to be heated to obtain a real-time length to be heated of the battery pack, including:
step 1, determining an alternative heating time length as a real-time heating time length of a first moment when a current temperature is obtained;
step 2, determining a first moment when the current temperature and a first moment when the previous temperature are obtained, and calculating according to a formula 3 to obtain the descending rate of the time length to be heated;
and step 3, calculating to obtain the time length to be heated corresponding to the current moment according to a formula 4.
T1 (k) = T1 (k-1) -rate formula 4
Wherein k represents the current time, k-1 represents the previous time, T1 (k-1) is the time length to be heated calculated at the previous time, and T1 (k) is the real-time length to be heated. The first time is the corresponding time when the current temperature of the battery pack is recorded for the first time, and it can be understood that the time length to be heated for the alternative, which is directly calculated according to the temperature at this time, is used as the time length to be heated for the real time, that is, T1 (0) is the time length to be heated for the alternative, which is calculated according to the current temperature. And for each time after the first time, adjusting in real time according to the formula 4 until the time length to be heated corresponding to the current time is obtained.
It can be understood that after entering the second heating state, the filtering process may be repeated between two temperature acquisitions of the battery pack, and the time duration to be heated at the next time is determined by the time duration to be heated at the previous time. It will be appreciated that the time interval between the preceding and following instants may be an update frequency of the length of time to be heated. For example, if the heating duration is updated every 1min to provide the user reference, the time interval between the previous and subsequent times is 1min.
According to the method for determining the heating time of the battery pack, when the battery pack enters the second heating state, the remaining time to be heated in the second heating state is adjusted according to the current temperature of the battery pack, filtering is further performed, the obtained real-time to be heated is obtained, and the accuracy of determining the heating time of the battery pack can be further guaranteed.
The effect of the method for determining the heating time period of the battery pack provided in the embodiment of the present application is described below with reference to table 1. BP2000 and BP5000 are battery packs with different capacity specifications, and 0 ℃, minus 5 ℃, minus 10 ℃, minus 15 ℃ and minus 20 ℃ are initial temperatures of the battery packs. As shown in table 1 below, the error statistics of the time length to be heated required for heating the battery packs of the above two specifications to the target heating temperature (10 ℃) and the actual time length to be heated are determined by using the method for determining the heating time length of the battery pack provided by the present application at different initial temperatures.
TABLE 1
Referring to fig. 4, fig. 4 is a schematic structural diagram of a device for determining a heating time period of a battery pack according to an embodiment of the present application. In some embodiments, the battery pack heating period determination device 20 may include a plurality of functional modules composed of computer program segments. The computer programs of the various program segments in the battery pack warm-up time determination apparatus 20 may be stored in the memory of the energy storage device and executed by the at least one controller to perform the functions of the battery pack warm-up time determination (described in detail in fig. 1).
In the present embodiment, the battery pack heating period determination device 20 may be divided into a plurality of functional modules according to the functions it performs. The functional module may include: a state information monitoring module 201, a heating parameter determination module 202, a total time length determination module 203, an accumulated time length determination module 204, a remaining time length determination module 205, and a remaining time length adjustment module 206. The modules referred to herein are a series of computer program segments stored in a memory that can be executed by at least one controller and that can perform a fixed function. In the present embodiment, the functions of the modules will be described in detail in the following embodiments.
The status information monitoring module 201 may be used to monitor status information of the battery pack.
The heating parameter determination module 202 may be configured to determine an actual heating parameter of the battery pack when the state information satisfies the first heating state.
The total duration determining module 203 may be configured to determine the total duration to be heated of the battery pack in the first heating state according to the actual heating parameter and the preset corresponding relationship.
The accumulated time period determination module 204 may be configured to heat the battery pack and accumulate the heating time period.
The remaining duration determination module 205 may be configured to determine the remaining duration to be heated of the battery pack at the time of the state transition according to the total duration to be heated and the accumulated heating duration when the battery pack is changed from the first heating state to the second heating state.
The remaining duration adjusting module 206 may be configured to adjust the remaining duration to be heated according to the current temperature of the battery pack after the battery pack enters the second heating state, so as to obtain the real-time duration to be heated of the battery pack.
It can be understood that the battery pack heating duration determining device 20 and the battery pack heating duration determining method in the foregoing embodiment belong to the same inventive concept, and the specific implementation manner of each module of the battery pack heating duration determining device 20 corresponds to each step of the battery pack heating duration determining method in the foregoing embodiment, which is not described herein again.
The present application further provides an energy storage device, which includes a battery pack, a controller and a memory, where the memory stores a computer program, and the controller is configured to execute the computer program stored in the memory to implement the method for determining a heating time period of the battery pack described in the foregoing embodiments.
The embodiment of the present application describes a structure of an energy storage device with reference to fig. 5. As shown in fig. 5, the energy storage device 30 includes a memory 31, at least one controller 32, at least one communication bus 33, and a battery pack 34.
Those skilled in the art will appreciate that the configuration of the energy storage device shown in fig. 5 is not a limitation of the embodiments of the present application, and that the energy storage device 30 may include more or less hardware or software than shown, or a different arrangement of components. For example, energy storage device 30 may also include a plurality of interfaces, a first interface for accessing a load to power the load. The second interface is used for accessing the independent battery pack so as to increase the capacity of the energy storage device.
The energy storage device 30 includes an electronic device with an energy storage function, including the self-moving devices such as the car device, the mowing device, the sweeping device, the mine clearing device, and the cruising device, as described above, and also includes an energy storage device such as a mobile energy storage device and a household energy storage device, or other electronic devices requiring an energy storage battery pack. Energy storage device 30 may also include a client device, which includes, but is not limited to, any electronic product capable of interacting with a client through a keyboard, a mouse, a remote controller, a touch pad, or a voice control device, for example, a personal computer, a tablet computer, a smart phone, a digital camera, etc.
It should be noted that the energy storage device 30 is only an example, and other existing or future electronic products, such as those that may be adapted to the present application, are also included in the scope of the present application and are incorporated by reference herein.
In some embodiments, the memory 31 stores a computer program that, when executed by the at least one controller 32, implements all or a portion of the steps of the method for determining a length of time to heat a battery pack 35 as described. The Memory 31 includes a Read-Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Programmable Read-Only Memory (EPROM), a One-time Programmable Read-Only Memory (OTPROM), an electronically Erasable Programmable Read-Only Memory (Electrically-Erasable Programmable Read-Only Memory (EEPROM), an EEPROM), a Compact Disc Read-Only Memory (CD-ROM) or other optical Disc storage, a magnetic disk storage, a tape storage, or any other medium capable of being used to carry or store data.
Further, the computer-readable storage medium may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the energy storage device 30, and the like.
In some embodiments, at least one controller 32 is a Control Unit (Control Unit) of energy storage device 30, and is connected to various components of energy storage device 30 through various interfaces and lines, and executes various functions and processes data of energy storage device 30 by running or executing programs or modules stored in memory 31 and calling data stored in memory 31. For example, the at least one controller 32, when executing a computer program stored in the memory, implements all or part of the steps of the battery pack heating period determination method in the embodiment of the present application; or to implement all or part of the functions of the battery pack heating time period determination device. The at least one controller 32 may be composed of an integrated circuit, for example, a single packaged integrated circuit, or may be composed of a plurality of integrated circuits packaged with the same function or different functions, including one or more Central Processing Units (CPUs), microprocessors, digital Processing chips, graphics processors, and combinations of various control chips.
In some embodiments, at least one communication bus 33 is provided to enable connectivity communication between the memory 31 and at least one controller 32, and the like.
Although not shown, the energy storage device 30 may further include a battery pack 34 for supplying power to various components, and preferably, the battery pack 34 may be logically connected to the at least one controller 32 through a power management device, so as to implement functions of managing charging, discharging, and power consumption through the power management device. The energy storage device may also include any component of one or more dc or ac power sources, recharging devices, power failure detection circuitry, power converters or inverters, power status indicators, and the like. The energy storage device 30 may further include various sensors, a bluetooth module, a Wi-Fi module, etc., which are not described herein again.
The integrated unit implemented in the form of a software functional module may be stored in a computer-readable storage medium. The software functional module is stored in a storage medium and includes several instructions to enable an energy storage device (which may be a personal computer, an energy storage device, or a network device) or a controller (processor) to execute parts of the methods according to the embodiments of the present application.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a module may be divided into only one logical function, and may be divided into other ways in actual implementation.
Modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional module.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it will be obvious that the term "comprising" does not exclude other elements or the singular does not exclude the plural. A plurality of units or means recited in the specification may also be implemented by one unit or means through software or hardware. The terms first, second, etc. are used to denote names, but not to denote any particular order.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present application without departing from the spirit and scope of the technical solutions of the present application.
Claims (10)
1. A method for determining a heating time period of a battery pack, the method comprising:
monitoring state information of the battery pack;
when the state information meets a first heating state, determining actual heating parameters of the battery pack;
determining the total heating waiting time of the battery pack in the first heating state according to the actual heating parameters and a preset corresponding relation; the preset corresponding relation is the corresponding relation between the heating parameters and the heating time length;
heating the battery pack and accumulating the heating time;
when the battery pack is changed from a first heating state to a second heating state, determining the remaining time to be heated of the battery pack during state transition according to the total time to be heated and the accumulated heating time;
and after the battery pack enters a second heating state, adjusting the residual time length to be heated according to the current temperature of the battery pack to obtain the real-time length to be heated of the battery pack.
2. The method of claim 1, wherein the monitoring the status information of the battery pack comprises:
acquiring the current temperature of the battery pack;
acquiring the charge and discharge state of the battery pack;
and determining the state information of the battery pack according to the current temperature and the charging and discharging state.
3. The method of claim 2, wherein the charge-discharge state comprises a charge state, a discharge state, and a rest state; the determining the state information of the battery pack according to the current temperature and the charge and discharge state comprises:
when the current temperature is smaller than a preset temperature threshold value and the battery pack is in a standing state, determining that the battery pack meets a first heating state;
and when the current temperature is greater than the preset temperature threshold value or the battery pack is in a charging state or a discharging state, determining that the battery pack meets a second heating state.
4. The method of claim 1, wherein the heating parameters include an initial temperature and a heating power; the determining the total heating waiting time of the battery pack in the first heating state according to the actual heating parameters and the preset corresponding relation comprises the following steps:
traversing the corresponding relation between the heating parameters and the heating time length, and determining the total time length to be heated of the battery pack from the initial temperature under the heating power.
5. The method of claim 4, wherein the adjusting the remaining time period to be heated according to the current temperature of the battery pack to obtain the real-time period to be heated of the battery pack comprises:
obtaining a correction function in a preset heating time interval, wherein the minimum value of the preset heating time interval is zero, and the maximum value is the residual time to be heated;
calculating to obtain the alternative time length to be heated according to the current temperature of the battery pack and the correction function;
and before the temperature of the battery pack is obtained again, filtering the alternative time length to be heated to obtain the real-time length to be heated of the battery pack.
6. The method of claim 5, wherein calculating the candidate heating period based on the current temperature of the battery pack and the correction function comprises:
acquiring the current temperature of the battery pack;
calculating the alternative time length to be heated according to the current temperature and the correction function, wherein the correction function is as follows:
wherein T is the current temperature, f (T) is the alternative to-be-heated time length, f 0 For the remaining time period to be heated, T k Is a preset target heating temperature, T 0 The temperature of the battery pack when the battery pack enters the second heating state from the first heating state.
7. The method of claim 6, wherein the filtering the alternative heating time period before obtaining the temperature of the battery pack again to obtain the real-time heating time period of the battery pack comprises:
determining the descending rate of the time length to be heated according to the time length to be heated of the alternative, the acquisition time of the current temperature and the acquisition time of the last temperature of the battery pack;
and before the temperature of the battery pack is obtained again, calculating the real-time to be heated according to the reduction rate of the time to be heated and the alternative time to be heated.
8. A battery pack heating time period determination apparatus, characterized in that the method comprises:
the state information monitoring module is used for monitoring the state information of the battery pack;
the heating parameter determining module is used for determining the actual heating parameters of the battery pack when the state information meets a first heating state;
a total duration determining module, configured to determine, according to the actual heating parameter and a preset corresponding relationship, a total duration to be heated of the battery pack in the first heating state; the preset corresponding relation is the corresponding relation between the heating parameters and the heating time length;
the accumulated time length determining module is used for heating the battery pack and accumulating the heating time length;
the remaining duration determining module is used for determining the remaining duration to be heated of the battery pack during state transition according to the total duration to be heated and the accumulated heating duration when the battery pack is changed from the first heating state to the second heating state;
and the remaining time length adjusting module is used for adjusting the remaining time length to be heated according to the current temperature of the battery pack after the battery pack enters a second heating state, so as to obtain the real-time length to be heated of the battery pack.
9. An energy storage device comprising a battery pack and a controller for implementing the method of determining the length of time for which the battery pack is heated according to any one of claims 1 to 7 when executing a computer program stored in a memory.
10. A computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a controller, implements the method for determining a heating time period of a battery pack according to any one of claims 1 to 7.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116061766A (en) * | 2023-04-06 | 2023-05-05 | 成都赛力斯科技有限公司 | Method, device, equipment and storage medium for heating interior of automobile battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116061766A (en) * | 2023-04-06 | 2023-05-05 | 成都赛力斯科技有限公司 | Method, device, equipment and storage medium for heating interior of automobile battery |
| CN116061766B (en) * | 2023-04-06 | 2023-06-27 | 成都赛力斯科技有限公司 | Method, device, equipment and storage medium for heating interior of automobile battery |
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