CN114430091B - Dynamic control method and system for pressure of battery pack - Google Patents
Dynamic control method and system for pressure of battery pack Download PDFInfo
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- CN114430091B CN114430091B CN202210003192.6A CN202210003192A CN114430091B CN 114430091 B CN114430091 B CN 114430091B CN 202210003192 A CN202210003192 A CN 202210003192A CN 114430091 B CN114430091 B CN 114430091B
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/375—Vent means sensitive to or responsive to temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
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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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/50—Methods or arrangements for servicing or maintenance, e.g. for maintaining operating temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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Abstract
The invention discloses a dynamic control method and a system for the pressure of a battery pack, wherein the upper limit of the safety pressure obtained by the method changes along with the change of the environment temperature and the working state of the battery pack, and when the difference value of the internal pressure minus the upper limit of the safety pressure is higher than a first preset pressure difference, the pressure of the battery pack needs to be released at the moment, and an electromagnetic valve is opened to release the pressure of the battery pack timely.
Description
Technical Field
The invention relates to the technical field of dynamic control of battery pack pressure, in particular to a dynamic control method and system of battery pack pressure.
Background
Excessive internal pressure of the battery pack can cause the battery pack to fire or even explode, and internal pressure control of the battery pack is an important remedy for preventing the battery pack from firing or exploding. One or more physical pressure relief valves are generally designed on the battery pack, and the physical pressure relief valves are opened when the internal pressure of the battery pack is higher than the opening pressure of the physical pressure relief valves, so that the battery pack is decompressed.
Because the battery pack has different internal safety pressure upper limits under different environment temperatures and battery working states, the opening pressure of the physical pressure relief valve is a fixed value, and the internal safety pressure upper limit is possibly smaller than the opening pressure of the physical pressure relief valve under certain conditions, the situation that the internal pressure of the battery pack exceeds the safety pressure upper limit and the physical pressure relief valve is not opened yet can not release the pressure of the battery pack in time can occur.
Disclosure of Invention
The invention provides a dynamic control method and a dynamic control system for the pressure of a battery pack, which solve the technical problem that the pressure of the battery pack is not released timely in the prior art.
In one aspect, the present invention provides the following technical solutions:
a battery pack pressure dynamic control method, comprising:
Detecting the internal pressure of the battery pack, the ambient temperature of the battery pack, the internal temperature of the battery pack and the charge and discharge current of the battery pack;
Calculating the current safety pressure upper limit of the battery pack according to the ambient temperature, the internal temperature and the charge-discharge current;
If the difference value of the internal pressure minus the upper safety pressure limit is higher than a first preset pressure difference, opening an electromagnetic valve on the battery pack, and after the difference value of the internal pressure minus the upper safety pressure limit is higher than a second preset pressure difference, closing the electromagnetic valve;
if the difference value of the internal pressure minus the upper safety pressure limit is lower than the first preset pressure difference under the condition that the battery pack is not collided, the electromagnetic valve is kept to be closed;
wherein the first preset pressure difference and the second preset pressure difference are both greater than or equal to zero.
Preferably, the calculating the current safety pressure upper limit of the battery pack according to the ambient temperature, the internal temperature and the charge-discharge current includes:
P1＝P0(1+a*(Ta-Tw)/Tw+b×Id/Ic)；
P1 is the upper limit of the safety pressure, P0 is the pressure of the battery pack after standing for a fixed period of time after the end of charge and discharge at normal temperature, a is a temperature influence coefficient, ta is the internal temperature, tw is the ambient temperature, b is a current influence coefficient, id is the charge and discharge current, and Ic is the current of the battery pack under a set discharge multiplying power.
Preferably, the first preset pressure difference is zero, and the second preset pressure difference is greater than zero.
Preferably, after calculating the current upper safety pressure limit of the battery pack according to the ambient temperature, the internal temperature and the charge-discharge current, the method further comprises:
if the internal pressure of the battery pack is lower than the safety pressure upper limit and the predicted pressure of the battery pack is higher than the safety pressure upper limit when the battery pack collides, opening the electromagnetic valve and keeping the preset time, if the internal pressure after the preset time is higher than the safety pressure upper limit, keeping the electromagnetic valve open, and if the internal pressure after the preset time is lower than the safety pressure upper limit, closing the electromagnetic valve;
If the internal pressure and the predicted pressure are lower than the upper safety pressure limit when the battery pack collides, the electromagnetic valve is kept closed;
If the internal pressure of the battery pack is lower than the safety pressure upper limit and the predicted pressure of the battery pack is higher than the safety pressure upper limit when the battery pack collides, opening the electromagnetic valve and keeping the preset time period, if the internal pressure of the battery pack after the preset time period is higher than the safety pressure upper limit, keeping the electromagnetic valve open, and if the internal pressure of the battery pack after the preset time period is lower than the safety pressure upper limit, closing the electromagnetic valve; if the internal pressure and the predicted pressure are both lower than the safety pressure upper limit when the battery pack collides, the solenoid valve is kept closed, and the method further comprises the following steps:
Detecting vehicle acceleration and battery pack acceleration, subtracting the vehicle acceleration from the battery pack acceleration to obtain collision acceleration of the battery pack, and determining the predicted pressure according to the collision acceleration.
On the other hand, the invention also provides the following technical scheme:
A battery pack pressure dynamic control system, comprising:
the electromagnetic valve is used for releasing pressure of the battery pack;
a pressure sensor for detecting an internal pressure of the battery pack;
The first temperature sensor is used for detecting the ambient temperature of the battery pack;
A second temperature sensor for detecting an internal temperature of the battery pack;
The current sensor is used for detecting the charge and discharge current of the battery pack;
The controller is used for calculating the current safety pressure upper limit of the battery pack according to the ambient temperature, the internal temperature and the charge-discharge current; if the difference value of the internal pressure minus the upper safety pressure limit is higher than a first preset pressure difference, opening an electromagnetic valve on the battery pack, and after the difference value of the internal pressure minus the upper safety pressure limit is higher than a second preset pressure difference, closing the electromagnetic valve; if the difference value of the internal pressure minus the upper safety pressure limit is lower than the first preset pressure difference under the condition that the battery pack is not collided, the electromagnetic valve is kept to be closed;
wherein the first preset pressure difference and the second preset pressure difference are both greater than or equal to zero.
Preferably, the safety pressure upper limit satisfies:
P1＝P0(1+a*(Ta-Tw)/Tw+b×Id/Ic)；
P1 is the upper limit of the safety pressure, P0 is the pressure of the battery pack after standing for a fixed period of time after the end of charge and discharge at normal temperature, a is a temperature influence coefficient, ta is the internal temperature, tw is the ambient temperature, b is a current influence coefficient, id is the charge and discharge current, and Ic is the current of the battery pack under a set discharge multiplying power.
Preferably, the first preset pressure difference is zero, and the second preset pressure difference is greater than zero.
Preferably, the dynamic control system for the pressure of the battery pack further comprises:
A first acceleration sensor for detecting a vehicle acceleration;
the second acceleration sensor is used for detecting the acceleration of the battery pack;
The controller is further used for subtracting the vehicle acceleration from the battery pack acceleration to obtain the collision acceleration of the battery pack, and determining the predicted pressure according to the collision acceleration; if the internal pressure of the battery pack is lower than the safety pressure upper limit and the predicted pressure of the battery pack is higher than the safety pressure upper limit when the battery pack collides, opening the electromagnetic valve and keeping the preset time, if the internal pressure after the preset time is higher than the safety pressure upper limit, keeping the electromagnetic valve open, and if the internal pressure after the preset time is lower than the safety pressure upper limit, closing the electromagnetic valve; and if the internal pressure and the predicted pressure are lower than the upper safety pressure limit when the battery pack collides, the electromagnetic valve is kept closed.
On the other hand, the invention also provides the following technical scheme:
an electronic device comprising a memory, a controller and a computer program stored on the memory and operable on the controller, the controller implementing any one of the above-described battery pack pressure dynamic control methods when executing the program.
On the other hand, the invention also provides the following technical scheme:
A computer readable storage medium that when executed implements any of the battery pack pressure dynamic control methods described above.
The one or more technical schemes provided by the invention have at least the following technical effects or advantages:
The upper limit of the safety pressure changes along with the change of the environment temperature and the working state of the battery pack, when the difference value of the internal pressure minus the upper limit of the safety pressure is higher than a first preset pressure difference, the pressure of the battery pack needs to be released at the moment, and the electromagnetic valve is opened to timely release the pressure of the battery pack.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for dynamic control of battery pack pressure in an embodiment of the invention;
FIG. 2 is a schematic diagram showing the relationship between the internal pressure of the battery pack and the ambient temperature, and the charge/discharge current in the embodiment of the invention;
FIG. 3 is another flow chart of a method for dynamic control of battery pack pressure in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram showing the relationship between the collision acceleration and the predicted pressure according to the embodiment of the present invention;
FIG. 5 is a schematic diagram of a dynamic control system for the pressure of a battery pack according to an embodiment of the present invention;
fig. 6 is a schematic diagram of another structure of a dynamic control system for pressure of a battery pack according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention solves the technical problem of untimely release of the pressure of the battery pack in the prior art by providing the method and the system for dynamically controlling the pressure of the battery pack.
In order to better understand the technical scheme of the present invention, the following detailed description will refer to the accompanying drawings and specific embodiments.
First, the term "and/or" appearing herein is merely an association relationship describing associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
As shown in fig. 1, the battery pack pressure dynamic control method of the present embodiment includes:
Step S1, detecting the internal pressure of a battery pack, the ambient temperature of the battery pack, the internal temperature of the battery pack and the charge and discharge current of the battery pack;
step S2, calculating the current upper safety pressure limit of the battery pack according to the ambient temperature, the internal temperature and the charge-discharge current;
step S3, if the difference value of the internal pressure minus the upper limit of the safety pressure is higher than a first preset pressure difference, opening the electromagnetic valve on the battery pack, and after the difference value of the upper limit of the safety pressure minus the internal pressure is higher than a second preset pressure difference, closing the electromagnetic valve;
Step S4, if the difference value of the internal pressure minus the upper limit of the safety pressure is lower than a first preset pressure difference under the condition that the battery pack is not collided, the electromagnetic valve is kept closed;
wherein, the first preset pressure difference and the second preset pressure difference are both larger than or equal to zero.
According to experiments, the relationship between the internal pressure of the battery pack and the ambient temperature and the charge-discharge current is shown in fig. 2, and the corresponding upper safety pressure limit also changes with the ambient temperature and the charge-discharge current. Step S2 of the present embodiment includes: p1=p0 (1+a (Ta-Tw)/tw+b×id/Ic); p1 is the upper limit of safety pressure, P0 is the pressure of the battery pack after standing for a fixed period of time after the charge and discharge of the battery pack are finished at normal temperature, the normal temperature is 25 ℃, the fixed period of time is 12h, a is a temperature influence coefficient, ta is an internal temperature, tw is an ambient temperature, b is a current influence coefficient, id is a charge and discharge current, and Ic is a current of the battery pack under a set discharge multiplying power. Therefore, the upper safety pressure limit in the current state can be obtained through the formula no matter how the ambient temperature and the working state of the battery pack change.
In step S3, the first preset pressure difference and the second preset pressure difference may be both zero, which is equivalent to immediately opening the electromagnetic valve after the internal pressure is higher than the upper safety pressure limit, and immediately closing the electromagnetic valve after the internal pressure is lower than the upper safety pressure limit; the first preset pressure difference is larger than zero, the second preset pressure difference is zero, and the first preset pressure difference is equal to that the internal pressure is higher than the upper limit of the safety pressure by a certain value, then the electromagnetic valve is opened, and the electromagnetic valve is closed immediately after the internal pressure is lower than the upper limit of the safety pressure; the first preset pressure difference is zero, the second preset pressure is larger than zero, and the first preset pressure difference is equal to that the electromagnetic valve is opened immediately after the internal pressure is higher than the upper limit of the safety pressure, and the electromagnetic valve is closed after the internal pressure is lower than the upper limit of the safety pressure by a certain value; it is also possible that the first preset pressure difference and the second preset pressure difference are both greater than zero. It is easy to think that if the first preset pressure difference and the second preset pressure difference are both zero, the solenoid valve may be frequently opened and closed when the internal pressure fluctuates around the upper safety pressure limit; the first preset pressure difference is greater than zero, the second preset pressure difference is greater than zero, the first preset pressure difference is zero, the second preset pressure is greater than zero, the electromagnetic valve can be prevented from being frequently opened and closed when the internal pressure fluctuates near the upper safety pressure limit under the two conditions, but the electromagnetic valve is required to be opened immediately to release pressure after the internal pressure is higher than the upper safety pressure limit in consideration of the importance of the safety of the battery pack, the first preset pressure difference is preferably zero, and the second preset pressure difference is greater than zero, so that the pressure of the battery pack can be timely released, and the electromagnetic valve can be prevented from being frequently opened and closed when the internal pressure fluctuates near the upper safety pressure limit.
In this embodiment, the upper safety pressure limit changes with the environmental temperature and the working state of the battery pack, and when the difference between the internal pressure minus the upper safety pressure limit is higher than the first preset pressure difference, the pressure of the battery pack needs to be released at this time.
Generally, after the battery pack collides, the internal battery core is easy to fail, faults such as short circuit, thermal runaway and the like occur, a physical chemical reaction can be triggered to release a large amount of gas, and because the battery pack is internally provided with a relatively sealed cavity, a large amount of gas is accumulated to cause a possible chain reaction and even fire explosion in the battery pack. After the battery pack collides, the rising speed of the internal pressure of the battery pack caused by the collision may be high, and if the internal pressure is higher than the upper safety pressure limit, the electromagnetic valve is opened, so that huge pressure cannot be released in time. For this purpose, as shown in fig. 3, after the preferred step S2, the method for dynamically controlling the pressure of the battery pack further includes:
Step S6, if the internal pressure of the battery pack is lower than the upper safety pressure limit and the predicted pressure of the battery pack is higher than the upper safety pressure limit during collision of the battery pack, the electromagnetic valve is opened and kept for a preset period of time, if the internal pressure of the battery pack is higher than the upper safety pressure limit after the preset period of time, the electromagnetic valve is kept open, and if the internal pressure of the battery pack is lower than the upper safety pressure limit after the preset period of time, the electromagnetic valve is closed;
Step S7, if the internal pressure and the predicted pressure are lower than the upper limit of the safety pressure when the battery pack collides, the electromagnetic valve is kept closed;
Before step S6 and step S7, the method for dynamically controlling the pressure of the battery pack further includes:
And S5, detecting the vehicle acceleration and the battery pack acceleration, subtracting the vehicle acceleration from the battery pack acceleration to obtain the collision acceleration of the battery pack, and determining the predicted pressure according to the collision acceleration.
In this embodiment, the predicted pressure is the maximum value that the internal pressure of the battery pack may reach due to the collision after the predicted collision occurs. In the case of a collision, the first preset pressure difference and the second preset pressure difference may be both zero.
In step S3, it is easily expected that if the internal pressure at the time of the collision of the battery pack is already higher than the safety pressure upper limit, the predicted pressure must be higher than the safety pressure upper limit, and at this time, since the solenoid valve is already opened in step S3, the internal pressure must be higher than the safety pressure upper limit immediately after the solenoid valve is opened, and the internal pressure will rise first and then fall or directly fall, and at this time, the processing in step S3 may be directly performed without considering the predicted pressure.
In step S5, the relationship between the collision acceleration and the predicted pressure is as shown in fig. 4, and the predicted pressure can be determined from the collision acceleration in fig. 4.
In step S6, if the internal pressure is lower than the upper safety pressure limit and the predicted pressure of the battery pack is higher than the upper safety pressure limit at the time of collision, the solenoid valve is immediately opened at the time of collision, and the pressure is released in advance, thereby avoiding a sudden increase in the internal pressure caused by collision. After collision, as the electromagnetic valve is opened, if the degree of collision is small, the speed of releasing the pressure by the electromagnetic valve is higher than the rising speed of the internal pressure caused by collision, and the internal pressure immediately drops; if the collision degree is large, the pressure release speed of the electromagnetic valve is lower than the internal pressure rising speed caused by collision, the internal pressure can rise and then fall, and the maximum value of the internal pressure can be higher than the upper safety pressure limit or lower than the upper safety pressure limit; or the pressure release speed of the electromagnetic valve is equal to the internal pressure rising speed caused by collision in a short time, and the internal pressure can be maintained and then reduced. Since the internal pressure change after the collision cannot be determined, the embodiment selects to keep the solenoid valve open for a preset time, and can consider that the internal pressure change caused by the collision within the preset time has disappeared, and the solenoid valve is selected to keep to be opened or closed according to the internal pressure after the preset time.
In step S7, if the internal pressure and the predicted pressure are both lower than the upper safety pressure limit at the time of collision, it is considered that the maximum value of the internal pressure rise due to collision is still lower than the upper safety pressure limit, and it is considered that the solenoid valve is not required to be opened.
Therefore, the embodiment can open the electromagnetic valve in advance to release pressure when the battery pack collides, so that the abrupt rise of the internal pressure of the battery pack caused by collision is avoided, and the safety risk of the battery pack caused by collision is reduced.
As shown in fig. 5, this embodiment further provides a dynamic control system for pressure of a battery pack, including:
the electromagnetic valve is used for releasing pressure of the battery pack;
a pressure sensor for detecting an internal pressure of the battery pack;
The first temperature sensor is used for detecting the ambient temperature of the battery pack;
A second temperature sensor for detecting an internal temperature of the battery pack;
The current sensor is used for detecting the charge and discharge current of the battery pack;
The controller is used for calculating the current safety pressure upper limit of the battery pack according to the ambient temperature, the internal temperature and the charge-discharge current; if the difference value of the internal pressure minus the upper limit of the safety pressure is higher than the first preset pressure difference, opening the electromagnetic valve on the battery pack, and after the difference value of the upper limit of the safety pressure minus the internal pressure is higher than the second preset pressure difference, closing the electromagnetic valve; if the difference value of the internal pressure minus the upper limit of the safety pressure is lower than the first preset pressure difference under the condition that the battery pack is not collided, the electromagnetic valve is kept to be closed;
wherein, the first preset pressure difference and the second preset pressure difference are both larger than or equal to zero.
In this embodiment, the upper safety pressure limit changes with the environmental temperature and the working state of the battery pack, and when the difference between the internal pressure minus the upper safety pressure limit is higher than the first preset pressure difference, the pressure of the battery pack needs to be released at this time.
Wherein, the upper limit of the safety pressure meets the following conditions: p1=p0 (1+a (Ta-Tw)/tw+b×id/Ic); p1 is the upper limit of safety pressure, P0 is the pressure of the battery pack after standing for a fixed period of time after the end of charge and discharge at normal temperature, a is the temperature influence coefficient, ta is the internal temperature, tw is the ambient temperature, b is the current influence coefficient, id is the charge and discharge current, and Ic is the current of the battery pack under the set discharge multiplying power. Therefore, the upper safety pressure limit in the current state can be obtained through the formula no matter how the ambient temperature and the working state of the battery pack change.
Wherein the first preset pressure difference is zero, and the second preset pressure difference is greater than zero. Therefore, the pressure of the battery pack can be timely released, and the electromagnetic valve can be prevented from being frequently opened and closed when the internal pressure fluctuates near the upper limit of the safety pressure.
Further, as shown in fig. 6, the dynamic control system for the pressure of the battery pack further includes:
A first acceleration sensor for detecting a vehicle acceleration;
the second acceleration sensor is used for detecting the acceleration of the battery pack;
the controller is also used for subtracting the vehicle acceleration from the battery pack acceleration to obtain the collision acceleration of the battery pack, and determining the predicted pressure according to the collision acceleration; if the internal pressure of the battery pack is lower than the upper safety pressure limit and the predicted pressure of the battery pack is higher than the upper safety pressure limit during collision of the battery pack, the electromagnetic valve is opened and kept for a preset period of time, if the internal pressure of the battery pack after the preset period of time is higher than the upper safety pressure limit, the electromagnetic valve is kept open, and if the internal pressure of the battery pack after the preset period of time is lower than the upper safety pressure limit, the electromagnetic valve is closed; if the internal pressure and the predicted pressure are lower than the upper safety pressure limit when the battery pack collides, the electromagnetic valve is kept closed.
The embodiment of the sample can open the electromagnetic valve in advance to release pressure when the battery pack collides, so that the abrupt increase of the internal pressure of the battery pack caused by collision is avoided, and the safety risk of the battery pack caused by collision is reduced.
Based on the same inventive concept as the battery pack pressure dynamic control method described above, the present embodiment also provides an electronic device including a memory, a controller, and a computer program stored on the memory and executable on the controller, wherein the controller implements the steps of any one of the battery pack pressure dynamic control methods described above when executing the program.
Where a bus architecture (represented by a bus), a bus may comprise any number of interconnected buses and bridges, linking together various circuits, including one or more controllers, as represented by a controller, and memory, as represented by a memory. The bus may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., as are well known in the art and, therefore, will not be further described herein. The bus interface provides an interface between the bus and the receiver and transmitter. The receiver and the transmitter may be the same element, i.e. a transceiver, providing a unit for communicating with various other apparatus over a transmission medium. The controller is responsible for managing the bus and general processing, while the memory may be used to store data used by the controller in performing operations.
Since the electronic device described in this embodiment is an electronic device used to implement the method for dynamically controlling the pressure of the battery pack in this embodiment, based on the method for dynamically controlling the pressure of the battery pack described in this embodiment, those skilled in the art can understand the specific implementation of the electronic device in this embodiment and various modifications thereof, so how this electronic device is implemented in this embodiment will not be described in detail herein. Any electronic device used by those skilled in the art to implement the method for dynamically controlling the pressure of a battery pack according to the embodiments of the present invention falls within the scope of the present invention.
Based on the same inventive concept as the battery pack pressure dynamic control method, the invention also provides a computer readable storage medium which realizes any battery pack pressure dynamic control method when being executed.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a controller of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the controller of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A method for dynamically controlling the pressure of a battery pack, comprising:
Detecting the internal pressure of the battery pack, the ambient temperature of the battery pack, the internal temperature of the battery pack and the charge and discharge current of the battery pack;
Calculating the current safety pressure upper limit of the battery pack according to the ambient temperature, the internal temperature and the charge-discharge current;
The calculating the current safety pressure upper limit of the battery pack according to the ambient temperature, the internal temperature and the charge-discharge current comprises the following steps: p1=p0 (1+a (Ta-Tw)/tw+b×id/Ic); p1 is the upper limit of the safety pressure, P0 is the pressure of the battery pack after standing for a fixed period of time after the end of charge and discharge at normal temperature, a is a temperature influence coefficient, ta is the internal temperature, tw is the ambient temperature, b is a current influence coefficient, id is the charge and discharge current, and Ic is the current of the battery pack under a set discharge multiplying power;
If the difference value of the internal pressure minus the upper safety pressure limit is higher than a first preset pressure difference, opening an electromagnetic valve on the battery pack, and after the difference value of the internal pressure minus the upper safety pressure limit is higher than a second preset pressure difference, closing the electromagnetic valve;
if the difference value of the internal pressure minus the upper safety pressure limit is lower than the first preset pressure difference under the condition that the battery pack is not collided, the electromagnetic valve is kept to be closed;
wherein the first preset pressure difference and the second preset pressure difference are both greater than or equal to zero.
2. The battery pack pressure dynamic control method of claim 1, wherein the first preset pressure difference is zero and the second preset pressure difference is greater than zero.
3. The method of claim 1, wherein after calculating the current upper safety pressure limit of the battery pack according to the ambient temperature, the internal temperature, and the charge/discharge current, further comprising:
if the internal pressure of the battery pack is lower than the safety pressure upper limit and the predicted pressure of the battery pack is higher than the safety pressure upper limit when the battery pack collides, opening the electromagnetic valve and keeping the preset time, if the internal pressure after the preset time is higher than the safety pressure upper limit, keeping the electromagnetic valve open, and if the internal pressure after the preset time is lower than the safety pressure upper limit, closing the electromagnetic valve;
If the internal pressure and the predicted pressure are lower than the upper safety pressure limit when the battery pack collides, the electromagnetic valve is kept closed;
If the internal pressure of the battery pack is lower than the safety pressure upper limit and the predicted pressure of the battery pack is higher than the safety pressure upper limit when the battery pack collides, opening the electromagnetic valve and keeping the preset time period, if the internal pressure of the battery pack after the preset time period is higher than the safety pressure upper limit, keeping the electromagnetic valve open, and if the internal pressure of the battery pack after the preset time period is lower than the safety pressure upper limit, closing the electromagnetic valve; if the internal pressure and the predicted pressure are both lower than the safety pressure upper limit when the battery pack collides, the solenoid valve is kept closed, and the method further comprises the following steps:
Detecting vehicle acceleration and battery pack acceleration, subtracting the vehicle acceleration from the battery pack acceleration to obtain collision acceleration of the battery pack, and determining the predicted pressure according to the collision acceleration.
4. A battery pack pressure dynamic control system, comprising:
the electromagnetic valve is used for releasing pressure of the battery pack;
a pressure sensor for detecting an internal pressure of the battery pack;
The first temperature sensor is used for detecting the ambient temperature of the battery pack;
A second temperature sensor for detecting an internal temperature of the battery pack;
The current sensor is used for detecting the charge and discharge current of the battery pack;
The controller is used for calculating the current safety pressure upper limit of the battery pack according to the ambient temperature, the internal temperature and the charge-discharge current; the upper safety pressure limit satisfies: p1=p0 (1+a (Ta-Tw)/tw+b×id/Ic); p1 is the upper limit of the safety pressure, P0 is the pressure of the battery pack after standing for a fixed period of time after the end of charge and discharge at normal temperature, a is a temperature influence coefficient, ta is the internal temperature, tw is the ambient temperature, b is a current influence coefficient, id is the charge and discharge current, and Ic is the current of the battery pack under a set discharge multiplying power; if the difference value of the internal pressure minus the upper safety pressure limit is higher than a first preset pressure difference, opening an electromagnetic valve on the battery pack, and after the difference value of the internal pressure minus the upper safety pressure limit is higher than a second preset pressure difference, closing the electromagnetic valve; if the difference value of the internal pressure minus the upper safety pressure limit is lower than the first preset pressure difference under the condition that the battery pack is not collided, the electromagnetic valve is kept to be closed;
wherein the first preset pressure difference and the second preset pressure difference are both greater than or equal to zero.
5. The battery pack pressure dynamic control system of claim 4, wherein the first preset pressure differential is zero and the second preset pressure differential is greater than zero.
6. The battery pack pressure dynamic control system of claim 4, further comprising:
A first acceleration sensor for detecting a vehicle acceleration;
the second acceleration sensor is used for detecting the acceleration of the battery pack;
the controller is further used for subtracting the vehicle acceleration from the battery pack acceleration to obtain the collision acceleration of the battery pack, and determining the predicted pressure according to the collision acceleration; if the internal pressure of the battery pack is lower than the safety pressure upper limit and the predicted pressure of the battery pack is higher than the safety pressure upper limit when the battery pack collides, opening the electromagnetic valve and keeping the preset time, if the internal pressure after the preset time is higher than the safety pressure upper limit, keeping the electromagnetic valve open, and if the internal pressure after the preset time is lower than the safety pressure upper limit, closing the electromagnetic valve; and if the internal pressure and the predicted pressure are lower than the upper safety pressure limit when the battery pack collides, the electromagnetic valve is kept closed.
7. An electronic device comprising a memory, a controller and a computer program stored on the memory and executable on the controller, the controller implementing the battery pack pressure dynamic control method of any one of claims 1-3 when the program is executed.
8. A computer readable storage medium, wherein the computer readable storage medium when executed implements the battery pack pressure dynamic control method of any one of claims 1-3.
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