CN114430091A - Dynamic control method and system for battery pack pressure - Google Patents
Dynamic control method and system for battery pack pressure Download PDFInfo
- Publication number
- CN114430091A CN114430091A CN202210003192.6A CN202210003192A CN114430091A CN 114430091 A CN114430091 A CN 114430091A CN 202210003192 A CN202210003192 A CN 202210003192A CN 114430091 A CN114430091 A CN 114430091A
- Authority
- CN
- China
- Prior art keywords
- pressure
- battery pack
- upper limit
- electromagnetic valve
- internal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000001133 acceleration Effects 0.000 claims description 45
- 238000007599 discharging Methods 0.000 claims description 29
- 230000015654 memory Effects 0.000 claims description 11
- 238000004590 computer program Methods 0.000 claims description 10
- 230000007613 environmental effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 12
- 230000008859 change Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
Abstract
The invention discloses a method and a system for dynamically controlling the pressure of a battery pack.
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
The internal pressure of the battery pack is excessive, which can cause the battery pack to fire and even explode, and the internal pressure control of the battery pack is an important remedy for preventing the battery pack from firing and exploding. One or more physical relief valves are generally designed on the battery pack, and the physical relief valve can be opened when the internal pressure of the battery pack is higher than the opening pressure of the physical relief valve, so that the pressure is released to the battery pack.
Because the battery package has different inside safe pressure upper limits under different ambient temperature and battery operating condition, the opening pressure of physics relief valve is the fixed value, and the inside safe pressure upper limit is less than the opening pressure of physics relief valve under probably some circumstances, can appear the battery package internal pressure and already surpass the situation that the physics relief valve has not opened when safe pressure upper limit, can't in time release battery package pressure.
Disclosure of Invention
The invention provides a method and a system for dynamically controlling the pressure of a battery pack, and solves the technical problem that the pressure of the battery pack is not released timely in the prior art.
On one hand, the invention provides the following technical scheme:
a method for dynamically controlling pressure of a battery pack comprises the following steps:
detecting the internal pressure of the battery pack, the ambient temperature of the battery pack, the internal temperature of the battery pack and the charging and discharging current of the battery pack;
calculating the current safety pressure upper limit of the battery pack according to the environment temperature, the internal temperature and the charging and discharging current;
if the difference value of the internal pressure minus the upper safety pressure limit is higher than a first preset pressure difference, an electromagnetic valve on the battery pack is opened, and after the difference value of the internal pressure minus the upper safety pressure limit is higher than a second preset pressure difference, the electromagnetic valve is closed;
under the condition that the battery pack is not collided, if the difference value obtained by subtracting the upper limit of the safety pressure from the internal pressure is lower than the first preset pressure difference, the electromagnetic valve is kept closed;
wherein the first predetermined pressure difference and the second predetermined pressure difference are both greater than or equal to zero.
Preferably, the calculating the current upper limit of the safety pressure of the battery pack according to the ambient temperature, the internal temperature, and the charging and discharging current includes:
P1＝P0(1+a*(Ta-Tw)/Tw+b×Id/Ic)；
p1 is the upper limit of the safe pressure, P0 is the pressure after the battery pack is placed for a fixed time after charging and discharging at normal temperature, a is the temperature influence coefficient, Ta is the internal temperature, Tw is the environmental temperature, b is the current influence coefficient, Id is the charging and discharging current, and Ic is the current of the battery pack at a set discharge rate.
Preferably, the first preset pressure difference is zero, and the second preset pressure difference is greater than zero.
Preferably, after calculating the current upper limit of the safety pressure of the battery pack according to the ambient temperature, the internal temperature, and the charging and discharging current, the method further includes:
if the internal pressure is lower than the upper limit of the safety pressure and the predicted pressure of the battery pack is higher than the upper limit of the safety pressure when the battery pack is collided, opening the electromagnetic valve and keeping the electromagnetic valve for a preset time, if the internal pressure after the preset time is higher than the upper limit of the safety pressure, keeping the electromagnetic valve open, and if the internal pressure after the preset time is lower than the upper limit of the safety pressure, closing the electromagnetic valve;
if the internal pressure and the predicted pressure are lower than the upper limit of the safe pressure when the battery pack is collided, keeping the electromagnetic valve closed;
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 during collision of the battery pack, opening the electromagnetic valve and keeping the electromagnetic valve for a preset time, if the internal pressure after the preset time is higher than the upper safety pressure limit, keeping the electromagnetic valve open, and if the internal pressure after the preset time is lower than the upper safety pressure limit, closing the electromagnetic valve; if the internal pressure and the predicted pressure are both lower than the upper limit of the safe pressure when the battery pack collides, the electromagnetic valve is kept closed, and the method also comprises the following steps:
detecting the acceleration of the vehicle and the acceleration of the battery pack, subtracting the acceleration of the vehicle from the acceleration of the battery pack to obtain the 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 relieving 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 charging and discharging current of the battery pack;
the controller is used for calculating the current safety pressure upper limit of the battery pack according to the environment temperature, the internal temperature and the charging and discharging current; if the difference value of the internal pressure minus the upper safety pressure limit is higher than a first preset pressure difference, an electromagnetic valve on the battery pack is opened, and after the difference value of the internal pressure minus the upper safety pressure limit is higher than a second preset pressure difference, the electromagnetic valve is closed; under the condition that the battery pack is not collided, if the difference value obtained by subtracting the upper limit of the safety pressure from the internal pressure is lower than the first preset pressure difference, the electromagnetic valve is kept closed;
wherein the first predetermined pressure difference and the second predetermined pressure difference are both greater than or equal to zero.
Preferably, the upper safety pressure limit satisfies:
P1＝P0(1+a*(Ta-Tw)/Tw+b×Id/Ic)；
p1 is the upper limit of the safe pressure, P0 is the pressure after the battery pack is placed for a fixed time after charging and discharging at normal temperature, a is the temperature influence coefficient, Ta is the internal temperature, Tw is the environmental temperature, b is the current influence coefficient, Id is the charging and discharging current, and Ic is the current of the battery pack at a set discharge rate.
Preferably, the first preset pressure difference is zero, and the second preset pressure difference is greater than zero.
Preferably, the dynamic control system for battery pack pressure further comprises:
a first acceleration sensor for detecting vehicle acceleration;
the second acceleration sensor is used for detecting the acceleration of the battery pack;
the controller is further configured to subtract the vehicle acceleration from the battery pack acceleration to obtain a collision acceleration of the battery pack, and determine the predicted pressure according to the collision acceleration; if the internal pressure is lower than the upper limit of the safety pressure and the predicted pressure of the battery pack is higher than the upper limit of the safety pressure when the battery pack is collided, opening the electromagnetic valve and keeping the electromagnetic valve for a preset time, if the internal pressure after the preset time is higher than the upper limit of the safety pressure, keeping the electromagnetic valve open, and if the internal pressure after the preset time is lower than the upper limit of the safety pressure, closing the electromagnetic valve; and if the internal pressure and the predicted pressure are lower than the upper limit of the safe pressure when the battery pack is collided, keeping the electromagnetic valve closed.
On the other hand, the invention also provides the following technical scheme:
an electronic device comprises a memory, a controller and a computer program stored on the memory and capable of running on the controller, wherein the controller executes the program to realize any one of the above dynamic control methods for the pressure of the battery pack.
On the other hand, the invention also provides the following technical scheme:
a computer readable storage medium, which when executed implements any of the above methods for dynamic control of battery pack pressure.
One or more technical schemes provided by the invention at least have 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 pressure of the battery pack can be released in time by opening the electromagnetic valve.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flow chart of a method for dynamically controlling battery pack pressure in an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the relationship between the internal pressure of the battery pack, the ambient temperature, and the charging/discharging current according to an embodiment of the present invention;
FIG. 3 is another flow chart of a method for dynamically controlling the pressure of a battery pack in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of crash acceleration versus predicted pressure in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a dynamic control system for battery pack pressure according to an embodiment of the present invention;
fig. 6 is another schematic structural diagram of a dynamic battery pack pressure control system according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method and a system for dynamically controlling the pressure of a battery pack, and solves the technical problem that the pressure of the battery pack is not released timely in the prior art.
In order to better understand the technical scheme of the invention, the technical scheme of the invention is described in detail in the following with the accompanying drawings and specific embodiments.
First, it is stated that the term "and/or" appearing herein is merely one type of associative relationship that describes an associated object, meaning that three types of relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
As shown in fig. 1, the method for dynamically controlling the pressure of a battery pack of this embodiment includes:
step S1, 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;
step S2, calculating the current safety pressure upper limit of the battery pack according to the environment temperature, the internal temperature and the charging and discharging current;
step S3, if the difference value of the internal pressure minus the upper safety pressure limit is higher than a first preset pressure difference, the electromagnetic valve on the battery pack is opened, and after the difference value of the internal pressure minus the upper safety pressure limit is higher than a second preset pressure difference, the electromagnetic valve is closed;
step S4, under the condition that the battery pack is not collided, if the difference value of the internal pressure minus the upper limit of the safety pressure is lower than a first preset pressure difference, 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.
It is found from experiments that the relationship between the internal pressure of the battery pack and the ambient temperature and the charge/discharge current is as shown in fig. 2, and the corresponding upper limit of the safety pressure also changes with the changes in 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 safe pressure, P0 is the pressure after the battery pack is placed for a fixed time after charging and discharging at normal temperature, the normal temperature is 25 ℃, the fixed time is 12h, a is the temperature influence coefficient, Ta is the internal temperature, Tw is the environmental temperature, b is the current influence coefficient, Id is the charging and discharging current, and Ic is the current of the battery pack under the set discharging multiplying power. Therefore, no matter how the ambient temperature and the working state of the battery pack change, the upper limit of the safety pressure in the current state can be obtained through the formula.
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 limit of the safety pressure, and immediately closing the electromagnetic valve after the internal pressure is lower than the upper limit of the safety pressure; the first preset pressure difference is larger than zero, the second preset pressure difference is zero, the electromagnetic valve is opened after the internal pressure is higher than the upper limit of the safety pressure by a certain value, 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 greater than zero, 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 both the first and second predetermined pressure differences are 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 electromagnetic valve may be opened and closed frequently when the internal pressure fluctuates around the upper limit of the safety pressure; the first preset pressure difference is larger than zero and the second preset pressure difference is zero, the first preset pressure difference is zero and the second preset pressure difference is larger than zero, under the two conditions, 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, the electromagnetic valve needs to be immediately opened to release the pressure after the internal pressure is higher than the upper limit of the safety pressure in consideration of the safety importance of the battery pack, the first preset pressure difference is preferably zero in the embodiment, the second preset pressure difference is larger than zero, 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.
In this embodiment, the upper limit of the safety pressure changes with changes in the ambient temperature and the operating state of the battery pack, and when the difference between the internal pressure and the upper limit of the safety pressure is higher than the first preset pressure difference, it represents that the pressure of the battery pack needs to be released at this time.
Generally, after a battery pack is collided, an internal battery core is easy to lose efficacy, and faults such as short circuit and thermal runaway occur, so that a physical and chemical reaction can be caused to release a large amount of gas. After the battery pack is collided, the rising speed of the internal pressure of the battery pack caused by the collision is possibly high, and if the electromagnetic valve is opened after the internal pressure is higher than the upper limit of the safe pressure, the huge pressure cannot be released in time. For this reason, as shown in fig. 3, after 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 limit of the safe pressure when the battery pack collides and the predicted pressure of the battery pack is higher than the upper limit of the safe pressure, the electromagnetic valve is opened and kept for a preset time, if the internal pressure after the preset time is higher than the upper limit of the safe pressure, the electromagnetic valve is kept opened, and if the internal pressure after the preset time is lower than the upper limit of the safe pressure, the electromagnetic valve is closed;
step S7, if the internal pressure and the predicted pressure are lower than the upper limit of the safe pressure when the battery pack collides, keeping the electromagnetic valve closed;
before step S6 and step S7, the method for dynamically controlling the pressure of the battery pack further includes:
and step S5, detecting the acceleration of the vehicle and the acceleration of the battery pack, subtracting the acceleration of the vehicle from the acceleration of the battery pack to obtain the collision acceleration of the battery pack, and determining the predicted pressure according to the collision acceleration.
In the present embodiment, the predicted pressure is the maximum value that the internal pressure of the battery pack caused by the collision may reach after the predicted collision occurs. In the event of a collision, both the first and second predetermined pressure differences may be zero.
In step S3, it is easy to think that the predicted pressure is higher than the upper limit of the safe pressure if the internal pressure of the battery pack at the time of collision is higher than the upper limit of the safe pressure, and at this time, since the electromagnetic valve is already opened in step S3, the internal pressure is higher than the upper limit of the safe pressure immediately after the electromagnetic valve is opened, and the internal pressure is increased and then decreased or directly decreased, and at this time, the predicted pressure may not be considered, and the process may be directly performed in step S3.
In step S5, the relationship between the crash acceleration and the predicted pressure is shown in fig. 4, and the predicted pressure can be determined from the crash acceleration from fig. 4.
In step S6, if the internal pressure is lower than the upper limit of the safe pressure at the time of the collision and the predicted pressure of the battery pack is higher than the upper limit of the safe pressure, the electromagnetic valve is opened immediately at the time of the collision to release the pressure in advance, thereby avoiding a sudden increase in the internal pressure due to the collision. After the collision happens, because the electromagnetic valve is opened, if the collision degree is small, the pressure releasing speed of the electromagnetic valve is higher than the internal pressure rising speed caused by the collision, and the internal pressure is immediately reduced; if the collision degree is large, the pressure releasing speed of the electromagnetic valve is lower than the internal pressure rising speed caused by collision, the internal pressure rises first and then falls, and the maximum value of the internal pressure can be higher than the upper limit of the safety pressure and can also be lower than the upper limit of the safety pressure; or the speed of the pressure release of the solenoid valve in a short time is equal to the speed of the rise of the internal pressure caused by collision, and the internal pressure is maintained and then reduced. Since the change of the internal pressure after the collision cannot be determined, in the embodiment, the electromagnetic valve is kept open for the preset time period, it can be considered that the change of the internal pressure caused by the collision in the preset time period has disappeared, and the electromagnetic valve is kept open or closed according to the internal pressure after the preset time period.
In step S7, if both the internal pressure and the predicted pressure are lower than the upper limit of the safe pressure at the time of the collision, it is considered that the maximum value of the increase in the internal pressure due to the collision is still lower than the upper limit of the safe pressure, and it is considered that the solenoid valve does not need to be opened.
Therefore, the electromagnetic valve can be opened in advance to release pressure when the battery pack collides, so that the sudden 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, the present embodiment further provides a system for dynamically controlling pressure of a battery pack, including:
the electromagnetic valve is used for decompressing 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 charging and discharging current of the battery pack;
the controller is used for calculating the current safety pressure upper limit of the battery pack according to the environment temperature, the internal temperature and the charging and discharging 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 closing the electromagnetic valve after the difference value of the internal pressure minus the upper safety pressure limit is higher than a second preset pressure difference; under the condition that the battery pack is not collided, if the difference value obtained by subtracting the upper limit of the safety pressure from the internal pressure is lower than a first preset pressure difference, 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.
In this embodiment, the upper limit of the safety pressure changes with changes in the ambient temperature and the operating state of the battery pack, and when the difference between the internal pressure and the upper limit of the safety pressure is higher than the first preset pressure difference, it represents that the pressure of the battery pack needs to be released at this time.
Wherein the upper limit of the safe pressure satisfies: p1 ═ P0(1+ a (Ta-Tw)/Tw + b × Id/Ic); p1 is the upper limit of safe pressure, P0 is the pressure after the battery pack is left to stand for a fixed period of time after charging and discharging 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 charging and discharging current, and Ic is the current of the battery pack at a set discharge rate. Therefore, no matter how the ambient temperature and the working state of the battery pack change, the upper limit of the safety pressure in the current state can be obtained through the formula.
The first preset pressure difference is zero, and the second preset pressure difference is larger than zero. Therefore, the pressure of the battery pack can be released in time, and the electromagnetic valve can be prevented from being opened and closed frequently when the internal pressure fluctuates near the upper limit of the safety pressure.
Further, as shown in fig. 6, the system for dynamically controlling 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 acceleration of the vehicle from the acceleration of the battery pack 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 limit of the safety pressure when the battery pack is collided and the predicted pressure of the battery pack is higher than the upper limit of the safety pressure, the electromagnetic valve is opened and kept for a preset time, if the internal pressure after the preset time is higher than the upper limit of the safety pressure, the electromagnetic valve is kept opened, and if the internal pressure after the preset time is lower than the upper limit of the safety pressure, the electromagnetic valve is closed; and if the internal pressure and the predicted pressure are lower than the upper limit of the safety pressure when the battery pack is collided, keeping the electromagnetic valve closed.
Therefore, the electromagnetic valve can be opened in advance to release pressure when the battery pack collides, so that the sudden 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.
Based on the same inventive concept as the battery pack pressure dynamic control method, the present embodiment further provides an electronic device, which includes a memory, a controller, and a computer program stored in the memory and running on the controller, wherein the controller implements the steps of any one of the battery pack pressure dynamic control methods when executing the program.
Where a bus architecture (represented by a bus) may include any number of interconnected buses and bridges that link together various circuits including one or more controllers, represented by controllers, and memories, represented by memories. The bus may also link various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface provides an interface between the bus and the receiver and transmitter. The receiver and transmitter may be the same element, i.e., a transceiver, providing a means 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 for implementing the method for dynamically controlling the pressure of the battery pack in the embodiment of the present invention, based on the method for dynamically controlling the pressure of the battery pack described in the embodiment of the present invention, a person skilled in the art can understand the specific implementation manner of the electronic device in this embodiment and various variations thereof, and therefore, how to implement the method in the embodiment of the present invention by the electronic device is not described in detail herein. As long as those skilled in the art implement the electronic device used in the method for dynamically controlling the pressure of the battery pack according to the embodiment of the present invention, the electronic device is within the scope of the present invention.
Based on the same inventive concept as the above battery pack pressure dynamic control method, the invention also provides a computer readable storage medium, which when executed implements any of the above battery pack pressure dynamic control methods.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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. Therefore, it is intended that the appended claims be interpreted as including 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for dynamically controlling pressure of a battery pack is characterized by comprising the following steps:
detecting the internal pressure of the battery pack, the ambient temperature of the battery pack, the internal temperature of the battery pack and the charging and discharging current of the battery pack;
calculating the current safety pressure upper limit of the battery pack according to the environment temperature, the internal temperature and the charging and discharging current;
if the difference value obtained by subtracting the upper safety pressure limit from the internal pressure is higher than a first preset pressure difference, opening an electromagnetic valve on the battery pack, and closing the electromagnetic valve after the difference value obtained by subtracting the internal pressure from the upper safety pressure limit is higher than a second preset pressure difference;
under the condition that the battery pack is not collided, if the difference value obtained by subtracting the upper limit of the safety pressure from the internal pressure is lower than the first preset pressure difference, the electromagnetic valve is kept closed;
wherein the first predetermined pressure difference and the second predetermined pressure difference are both greater than or equal to zero.
2. The method for dynamically controlling the pressure of the battery pack according to claim 1, wherein the calculating the current upper limit of the safety pressure of the battery pack according to the ambient temperature, the internal temperature and the charging and discharging current comprises:
P1＝P0(1+a*(Ta-Tw)/Tw+b×Id/Ic)；
p1 is the upper limit of the safe pressure, P0 is the pressure after the battery pack is placed for a fixed time after charging and discharging at normal temperature, a is the temperature influence coefficient, Ta is the internal temperature, Tw is the environmental temperature, b is the current influence coefficient, Id is the charging and discharging current, and Ic is the current of the battery pack at a set discharge rate.
3. The method of claim 1, wherein the first predetermined pressure difference is zero and the second predetermined pressure difference is greater than zero.
4. The method according to claim 1, wherein after calculating the current upper limit of the safety pressure of the battery pack according to the ambient temperature, the internal temperature and the charging and discharging current, the method further comprises:
if the internal pressure is lower than the upper limit of the safety pressure and the predicted pressure of the battery pack is higher than the upper limit of the safety pressure when the battery pack is collided, opening the electromagnetic valve and keeping the electromagnetic valve for a preset time, if the internal pressure after the preset time is higher than the upper limit of the safety pressure, keeping the electromagnetic valve open, and if the internal pressure after the preset time is lower than the upper limit of the safety pressure, closing the electromagnetic valve;
if the internal pressure and the predicted pressure are lower than the upper limit of the safe pressure when the battery pack is collided, keeping the electromagnetic valve closed;
if the internal pressure is lower than the upper limit of the safety pressure and the predicted pressure of the battery pack is higher than the upper limit of the safety pressure when the battery pack is collided, opening the electromagnetic valve and keeping the electromagnetic valve for a preset time, if the internal pressure after the preset time is higher than the upper limit of the safety pressure, keeping the electromagnetic valve open, and if the internal pressure after the preset time is lower than the upper limit of the safety pressure, closing the electromagnetic valve; if the internal pressure and the predicted pressure are both lower than the upper limit of the safe pressure when the battery pack collides, the electromagnetic valve is kept closed, and the method also comprises the following steps:
detecting the acceleration of the vehicle and the acceleration of the battery pack, subtracting the acceleration of the vehicle from the acceleration of the battery pack to obtain the collision acceleration of the battery pack, and determining the predicted pressure according to the collision acceleration.
5. A system for dynamically controlling battery pack pressure, comprising:
the electromagnetic valve is used for decompressing 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 charging and discharging current of the battery pack;
the controller is used for calculating the current safety pressure upper limit of the battery pack according to the environment temperature, the internal temperature and the charging and discharging current; if the difference value obtained by subtracting the upper safety pressure limit from the internal pressure is higher than a first preset pressure difference, opening an electromagnetic valve on the battery pack, and closing the electromagnetic valve after the difference value obtained by subtracting the internal pressure from the upper safety pressure limit is higher than a second preset pressure difference; under the condition that the battery pack is not collided, if the difference value obtained by subtracting the upper limit of the safety pressure from the internal pressure is lower than the first preset pressure difference, the electromagnetic valve is kept closed;
wherein the first predetermined pressure difference and the second predetermined pressure difference are both greater than or equal to zero.
6. The system of claim 5, wherein the upper safe pressure limit satisfies:
P1＝P0(1+a*(Ta-Tw)/Tw+b×Id/Ic)；
p1 is the upper limit of the safe pressure, P0 is the pressure after the battery pack is placed for a fixed time after charging and discharging at normal temperature, a is the temperature influence coefficient, Ta is the internal temperature, Tw is the environmental temperature, b is the current influence coefficient, Id is the charging and discharging current, and Ic is the current of the battery pack at a set discharge rate.
7. The system of claim 5, wherein the first predetermined pressure differential is zero and the second predetermined pressure differential is greater than zero.
8. The system for dynamically controlling battery pack pressure according to claim 5, further comprising:
a first acceleration sensor for detecting vehicle acceleration;
the second acceleration sensor is used for detecting the acceleration of the battery pack;
the controller is further configured to subtract the vehicle acceleration from the battery pack acceleration to obtain a collision acceleration of the battery pack, and determine the predicted pressure according to the collision acceleration; if the internal pressure is lower than the upper limit of the safety pressure and the predicted pressure of the battery pack is higher than the upper limit of the safety pressure when the battery pack is collided, opening the electromagnetic valve and keeping the electromagnetic valve for a preset time, if the internal pressure after the preset time is higher than the upper limit of the safety pressure, keeping the electromagnetic valve open, and if the internal pressure after the preset time is lower than the upper limit of the safety pressure, closing the electromagnetic valve; and if the internal pressure and the predicted pressure are lower than the upper limit of the safe pressure when the battery pack is collided, keeping the electromagnetic valve closed.
9. An electronic device comprising a memory, a controller, and a computer program stored on the memory and executable on the controller, wherein the controller implements the method of dynamically controlling the pressure of a battery pack according to any one of claims 1 to 4 when executing the program.
10. A computer-readable storage medium, wherein the computer-readable storage medium, when executed, implements the method of dynamic battery pack pressure control of any of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210003192.6A CN114430091B (en) | 2022-01-04 | 2022-01-04 | Dynamic control method and system for pressure of battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210003192.6A CN114430091B (en) | 2022-01-04 | 2022-01-04 | Dynamic control method and system for pressure of battery pack |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114430091A true CN114430091A (en) | 2022-05-03 |
| CN114430091B CN114430091B (en) | 2024-04-16 |
Family
ID=81311067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210003192.6A Active CN114430091B (en) | 2022-01-04 | 2022-01-04 | Dynamic control method and system for pressure of battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114430091B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3939011A (en) * | 1973-01-05 | 1976-02-17 | P. R. Mallory & Co. Inc. | Lithium cell with internal automatic safety controls |
| US20150118525A1 (en) * | 2013-10-29 | 2015-04-30 | Xiaomi Inc. | Methods and devices for battery protection |
| US20150207119A1 (en) * | 2012-09-14 | 2015-07-23 | Nissan Motor Co., Ltd. | Vehicle installed battery pack with pressure release structure |
| US20160172657A1 (en) * | 2013-10-31 | 2016-06-16 | Sony Corporation | Secondary battery, battery pack, electric vehicle, electric power storage system, electric power tool, and electronic apparatus |
| CN205406612U (en) * | 2016-03-14 | 2016-07-27 | 常州动为电力科技有限公司 | Battery relief valve of guaranteeing serviceability |
| CN205978375U (en) * | 2016-08-23 | 2017-02-22 | 上海汽车变速器有限公司 | A gasket centering device for bolt flange joint |
| US20190148796A1 (en) * | 2016-05-17 | 2019-05-16 | Mitsubishi Electric Corporation | Rechargeable battery protecting apparatus and power storage system |
| CN209088021U (en) * | 2018-11-22 | 2019-07-09 | 长城汽车股份有限公司 | Power battery pack explosion early warning device and electric car |
| JP2019145288A (en) * | 2018-02-19 | 2019-08-29 | トヨタ自動車株式会社 | Fuel cell system |
| US20210111443A1 (en) * | 2019-04-30 | 2021-04-15 | Contemporary Amperex Technology Co., Limited | Method, apparatus, system for detecting battery thermal runaway, and battery management unit |
-
2022
- 2022-01-04 CN CN202210003192.6A patent/CN114430091B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3939011A (en) * | 1973-01-05 | 1976-02-17 | P. R. Mallory & Co. Inc. | Lithium cell with internal automatic safety controls |
| US20150207119A1 (en) * | 2012-09-14 | 2015-07-23 | Nissan Motor Co., Ltd. | Vehicle installed battery pack with pressure release structure |
| US20150118525A1 (en) * | 2013-10-29 | 2015-04-30 | Xiaomi Inc. | Methods and devices for battery protection |
| US20160172657A1 (en) * | 2013-10-31 | 2016-06-16 | Sony Corporation | Secondary battery, battery pack, electric vehicle, electric power storage system, electric power tool, and electronic apparatus |
| CN205406612U (en) * | 2016-03-14 | 2016-07-27 | 常州动为电力科技有限公司 | Battery relief valve of guaranteeing serviceability |
| US20190148796A1 (en) * | 2016-05-17 | 2019-05-16 | Mitsubishi Electric Corporation | Rechargeable battery protecting apparatus and power storage system |
| CN205978375U (en) * | 2016-08-23 | 2017-02-22 | 上海汽车变速器有限公司 | A gasket centering device for bolt flange joint |
| JP2019145288A (en) * | 2018-02-19 | 2019-08-29 | トヨタ自動車株式会社 | Fuel cell system |
| CN209088021U (en) * | 2018-11-22 | 2019-07-09 | 长城汽车股份有限公司 | Power battery pack explosion early warning device and electric car |
| US20210111443A1 (en) * | 2019-04-30 | 2021-04-15 | Contemporary Amperex Technology Co., Limited | Method, apparatus, system for detecting battery thermal runaway, and battery management unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114430091B (en) | 2024-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108248389B (en) | Safety prevention and control method and system for power battery pack for electric vehicle and computer readable storage medium | |
| Magdici et al. | Adaptive cruise control with safety guarantees for autonomous vehicles | |
| US20160308887A1 (en) | In-vehicle network intrusion detection system and method for controlling the same | |
| Schofield et al. | Vehicle dynamics control and controller allocation for rollover prevention | |
| CN110687457B (en) | Battery pack abnormity detection method and device, storage medium and electronic equipment | |
| CN102436198B (en) | Control system for vehicle | |
| CN109895773A (en) | Convoy driving control system, device and method | |
| CN108839559A (en) | A kind of accelerator pedal dead-center position adaptive learning method, device and vehicle | |
| CN103883411A (en) | External characteristic control method and device of electrically-controlled engine | |
| CN114430091B (en) | Dynamic control method and system for pressure of battery pack | |
| CN107766078A (en) | Storage of variable values method, read method, operation perform method and device | |
| CN113335267B (en) | Engine starting control method, device and system, vehicle and related equipment | |
| CN108146422A (en) | Control method, device and the automobile of clutch | |
| CN108819928B (en) | Control the method and device of vehicle operation | |
| US20160079618A1 (en) | Fuel battery system | |
| JP3923810B2 (en) | Electronic control device for vehicle | |
| CN111479730B (en) | Brake system with a valve opening time correction device and method for correcting the valve opening time | |
| CN110143154A (en) | A kind of charging equipment, charging method, server and charging system | |
| US20090164079A1 (en) | Device and method for preventing a motor vehicle engine from stopping in an automatic brake operation | |
| CN113246881A (en) | Method and system for predictively regulating the temperature of at least one region of a vehicle component | |
| Semsar-Kazerooni et al. | Performance analysis of a cooperative adaptive cruise controller subject to dynamic time headway | |
| CN113759872A (en) | Processing method after controller reset | |
| Park et al. | Supervisory control of real-time discrete event systems under bounded time constraints | |
| CN113895316B (en) | Control method and device for fuel cell vehicle | |
| Tian et al. | Study on predicting bus lateral transfer ratio using a modified grey model |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |