CN114889488A - Battery pack collision detection device and method - Google Patents

Battery pack collision detection device and method Download PDF

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Publication number
CN114889488A
CN114889488A CN202210762285.7A CN202210762285A CN114889488A CN 114889488 A CN114889488 A CN 114889488A CN 202210762285 A CN202210762285 A CN 202210762285A CN 114889488 A CN114889488 A CN 114889488A
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collision
battery pack
point
module
acceleration
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谢书港
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Nanjing Waythink Automobile Technology Co ltd
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Nanjing Waythink Automobile Technology Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0132—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to vehicle motion parameters, e.g. to vehicle longitudinal or transversal deceleration or speed value
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/013—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over
    • B60R21/0136—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting collisions, impending collisions or roll-over responsive to actual contact with an obstacle, e.g. to vehicle deformation, bumper displacement or bumper velocity relative to the vehicle
    • 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
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sustainable Energy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Sustainable Development (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The embodiment of the invention discloses a battery pack collision detection device and method, relates to the technical field of new energy vehicles, and can be used for more specifically determining the position of a battery pack subjected to collision. The method comprises the following steps: a plurality of crash sensors and a processor; the collision sensors are respectively connected with the processor and used for acquiring acceleration information of the battery pack; the processor is at least used for receiving acceleration information which is sent by the collision sensors and is from a plurality of monitoring positions of the battery pack, and determining the collision position of the battery pack based on a collision position detection algorithm according to the acceleration information of the monitoring positions. The present invention is applicable to vehicles using batteries as a power source.

Description

Battery pack collision detection device and method
Technical Field
The invention relates to the technical field of new energy vehicles, in particular to a battery pack collision detection device and method.
Background
With the high development of society, the technology of new energy vehicles (mainly electric vehicles) is gradually mature, the number of new energy vehicles is greatly increased, and the protection of battery packs as power sources of the new energy vehicles is particularly important. During the operation of the new energy automobile, some minor accidents may occur, such as: the new energy automobile can be used on the surface of the new energy automobile when the new energy automobile is in collision or vibration caused by road bumps, and the like, but the battery pack can generate potential failure risks due to the occurrence of collision or vibration accidents.
For this reason, automobiles are generally equipped with a vehicle collision safety monitoring system. However, the inventor finds out in the process of realizing the invention: since the contact area of the battery pack with the portion of the vehicle where the battery pack is mounted is large, when the vehicle is subjected to vibration or collision, the area where the battery pack may be collided is also large, and it is difficult to specifically determine the position where the battery pack is collided.
Disclosure of Invention
In view of this, embodiments of the present invention provide a battery pack collision detection apparatus, which can more specifically determine a position where a battery pack is collided.
To achieve the above object, an embodiment of the present invention provides a battery pack collision detection apparatus, including: a plurality of crash sensors and a processor;
the collision sensors are respectively connected with the processor and used for acquiring acceleration information of the battery pack;
the processor is at least used for receiving acceleration information which is sent by the collision sensors and is from a plurality of monitoring positions of the battery pack, and determining the collision position of the battery pack based on a collision position detection algorithm according to the acceleration information of the monitoring positions.
With reference to the first aspect, in a first implementation manner of the first aspect, the processor includes: the device comprises a first data processing module, a first calculating module and a first determining module;
the first data processing module is used for filtering the electric signals of the acceleration information of the battery pack in the preset time, which are sent by each collision sensor, so as to obtain corresponding acceleration;
the first calculation module is used for integrating the accelerated speeds to obtain the speed variation of each monitoring point within the preset time;
the first determining module is used for calculating to obtain the relative coordinates of the collision points in the first direction based on the speed variation of the adjacent monitoring points in at least two first directions and calculating to obtain the relative coordinates of the collision points in the second direction based on the speed variation of the adjacent monitoring points in at least two second directions; wherein, at least one common monitoring point is arranged between the adjacent monitoring points in the two first directions and the adjacent monitoring points in the two second directions.
With reference to the first aspect and the first implementation manner of the first aspect, in a second implementation manner of the first aspect, the first determining module is specifically configured to determine the first value according to a formula
Figure BDA0003724510460000021
Calculating to obtain the relative coordinates of the collision points in the first direction; and, for the purpose of being in accordance with a formula
Figure BDA0003724510460000022
Calculating to obtain the relative coordinates of the collision points in the second direction; wherein, a is the relative coordinate of the collision point in the first direction, and b is the relative coordinate of the collision point in the second direction;
Figure BDA0003724510460000023
and
Figure BDA0003724510460000024
and x and mu are respectively correction coefficients of the positions of the collision points, and are between 0 and 1.
With reference to the first aspect, the first and second implementation manners of the first aspect, in a third implementation manner of the first aspect, the processor further includes: the comparison module is used for comparing the speed variation of each monitoring point after the speed variation of each monitoring point in preset time is obtained;
and selecting at least three monitoring points from large to small according to the speed variation for calculating the position of the collision point.
With reference to the first aspect, the first, second and third implementation manners of the first aspect, in a fourth implementation manner of the first aspect, the processor further includes: and the second calculation module is used for performing curve fitting according to the accelerations of at least three monitoring points to obtain a first acceleration of the battery pack collision point at a first time point.
With reference to the first aspect, the first, second, third and fourth implementation manners of the first aspect, in a fifth implementation manner of the first aspect, the second calculating module is further configured to calculate a second acceleration of the battery pack collision point at a second time point; the first time point and the second time point are two adjacent frame sampling points;
the processor further comprises: and the collision strength determining module is used for calculating the collision strength received by the battery pack according to the acceleration of at least two adjacent frame sampling points of the collision point of the battery pack in a preset time.
With reference to the first aspect, any one of the first to fifth implementation manners of the first aspect, and in a sixth implementation manner of the first aspect, the collision-strength determining module is specifically configured to calculate a formula according to collision strength
Figure BDA0003724510460000031
Calculating to obtain the collision strength of the battery pack; wherein, U accp (t) the impact strength, Acc, to which the battery pack is subjected p (t) is the acceleration of the collision point of the battery pack at a certain time point, wherein t is the time point when the vehicle collision occurs, n is the number of sampling frames, and omega is the number of sampling frames 1 ，ω 2 ，ω 3 Respectively are calibrated constants representing the variation of the tolerance degree of the battery pack along with the time after the collision; or, the collision strength determining module is specifically configured to calculate a formula according to a variation of the local velocity:
Figure BDA0003724510460000032
calculating to obtain the local speed variation of the battery pack; wherein Acc p (t) is the acceleration at a certain point in time at the point of battery pack impact,
Figure BDA0003724510460000033
is the local speed variation, t is the time point when the vehicle collision occurs;
determining the collision strength of the battery pack according to the local speed variation; alternatively, the first and second electrodes may be,
the collision strength determination module is specifically configured to calculate a formula according to the local displacement variation:
Figure BDA0003724510460000034
calculating to obtain the local displacement variation of the battery pack;
determining the collision strength of the battery pack according to the local displacement variation;
wherein Acc p (t) is the acceleration of the battery pack at a certain time point at the collision point, wherein t is the time point when the vehicle collision occurs; alternatively, the first and second electrodes may be,
the collision strength determining module is specifically used for determining the specific power, the local speed variation and the local displacement variation of the battery pack according to acceleration calculation;
and comprehensively determining the collision strength of the battery pack according to the specific power, the local speed variation and the local displacement variation.
With reference to the first aspect, in a seventh aspect of the first aspect, in combination with any one of the first to sixth embodiments of the first aspect, the impact sensor is an acceleration sensor, and the plurality of impact sensor arrays are arranged on a surface of the battery pack.
With reference to the first aspect, any one of the first to seventh embodiments of the first aspect, in an eighth embodiment of the first aspect, the battery pack: the collision sensor comprises a shell and a battery cell module, wherein the battery cell module is packaged in the shell, and a plurality of collision sensors are arranged on the inner side of the shell and in an interlayer in a rectangular array; alternatively, the first and second electrodes may be,
the battery pack is characterized in that: including casing and electric core module, electric core module encapsulate in the casing, electric core module includes a plurality of range upon range of electric cores of laying, and is a plurality of collision sensor is rectangular array and lays in the intermediate layer between the electric core.
According to the battery pack collision detection device and method provided by the embodiment of the invention, the acceleration information of the battery pack can be monitored in real time by arranging the collision sensor, the acceleration information is sent to the processor, and the processor determines the collision position of the battery pack based on a collision position detection algorithm according to the acceleration information. Therefore, the collision sensor is used for collecting the acceleration information of the battery pack, and the collision position of the battery pack can be determined more specifically through a collision position detection algorithm according to the acceleration information of the battery pack.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic block diagram of a battery pack collision detection apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a crash sensor disposed on a battery pack according to an embodiment of the present invention;
FIG. 3 is a block diagram schematically illustrating the structure of another embodiment of the battery pack collision detecting apparatus according to the present invention;
FIG. 4 is a schematic diagram illustrating a working flow of an embodiment of the battery pack collision detection apparatus according to the present invention;
fig. 5 is a schematic view of the working flow of another embodiment of the battery pack collision detection apparatus according to the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The battery pack collision detection device provided by the embodiment of the invention can be applied to a safe driving scene, and is particularly suitable for being installed on an electric automobile so as to realize the safe monitoring of a driving power supply of the electric automobile in the driving process of the automobile and improve the safety of the electric automobile. Among them, collision is a factor of damage to the battery pack, and when collision occurs, determination of the specific collision position of the battery pack is crucial to identification of the damage degree of the battery pack.
Referring to fig. 1 and 2, the battery pack collision detection apparatus includes: the method comprises the following steps: a plurality of impact sensors 100 and a processor 200, wherein in some embodiments, the impact sensors are acceleration sensors, and when applied, a plurality of impact sensor arrays are arranged on the surface of the battery pack; therefore, compared with the scheme that the collision sensor is arranged on the vehicle body or at the position far away from the battery pack, the embodiment can more accurately determine whether the battery pack is collided or not because the collision sensor directly collects the acceleration information of the battery pack, and further accurately determine the collision position and the collision strength of the battery pack according to the acceleration information of the battery pack.
The plurality of collision sensors are respectively connected with the processor and used for collecting acceleration information of the battery pack; specifically, a plurality of the collision sensors are electrically connected with the processor through a line.
The processor is at least used for receiving acceleration information which is sent by the collision sensors and is from a plurality of monitoring positions of the battery pack, and determining the collision position of the battery pack based on a collision position detection algorithm according to the acceleration information of the monitoring positions.
It can be understood that the collision deformation of the battery pack may affect the safety of the battery pack, and the magnitude of the collision strength of the battery pack may reflect whether the inside of the battery is damaged or destroyed, so that the detection of the collision strength and the collision position of the battery pack is an important measure for preventing the safety problem of the battery.
Currently, it is a difficult problem to determine the collision position of the battery pack. In the embodiment of the invention, a plurality of collision sensors for acquiring the acceleration information of the battery pack are distributed, and the processor can determine the collision position of the battery pack based on a collision position detection algorithm according to the acquired acceleration information of different parts of the battery. Therefore, the collision sensor acquires the acceleration information of the battery pack, and the collision position of the battery pack can be determined more specifically through a collision position detection algorithm according to the acceleration information of the battery pack.
Based on the same technical concept as the present embodiment, there is also provided a battery pack collision detection method, as shown in fig. 4, the method including the steps of: acquiring acceleration information of a plurality of monitoring positions of the battery pack; and determining the collision position of the battery pack based on a collision position detection algorithm according to the acceleration information of the monitoring positions.
For convenience of description, the battery pack collision detection device is taken as an example for description, and the battery pack collision detection method is not explained any more, and the technical concepts are basically the same, so that the battery pack collision detection device and the battery pack collision detection method can be referred to and cited.
The collision sensor 100 may be: any one of a capacitive, inductive, strain, piezoresistive or piezoelectric acceleration sensor.
When the collision sensor 100 and the processor 200 are mounted on a vehicle, in order to facilitate communication between various complicated lines arranged on the vehicle, components in the entire apparatus may implement communication between electronic components in a Control Area Network (CAN) bus communication protocol manner, and the processor 200 may be a Microcontroller (MCU), such as a single chip microcomputer, or a microcomputer with data processing capability, or a Raspberry Pi (Raspberry Pi).
The collision sensors are acceleration sensors, and a plurality of collision sensor arrays are arranged on the surface of the battery pack.
In order to improve the accuracy of the battery pack collision detection, the previous data accuracy affects the subsequent detection, and therefore, in some embodiments, the battery pack includes: the collision sensors are arranged on the inner side of the shell and in the interlayer in a rectangular array; alternatively, the first and second electrodes may be,
the battery pack is characterized in that: including casing and electric core module, electric core module encapsulate in the casing, electric core module includes a plurality of range upon range of electric cores of laying, and is a plurality of collision sensor is rectangular array and lays in the intermediate layer between the electric core.
In this embodiment, through laying a plurality of collision sensor inside the battery package casing, the acceleration information of battery package can directly be reflected to the data of gathering, and the situation data of battery package is indirectly reflected to the acceleration information of other positions of non-automobile body, is favorable to improving the accuracy that battery package collision detected.
As shown in fig. 2 and 3, in one embodiment of the present invention, the processor includes: the device comprises a first data processing module, a first calculating module and a first determining module;
the first data processing module is used for filtering the electric signals of the acceleration information of the battery pack in the preset time, which are sent by each collision sensor, so as to obtain corresponding acceleration;
illustratively, the processor (also called a controller) collects the acceleration signal acc of the installation point (different monitoring positions of the battery pack) of the collision sensor in real time through the collision sensor n (t) by pairing acc n (t) filtering to obtain a reconstructed acceleration acc' n (t)。
In some embodiments, the collected original electric signal containing the acceleration information is subjected to mean filtering processing according to a mean filtering formula to obtain a reconstructed acceleration acc' n (t) of (d). Wherein, the mean filtering formula is:
Figure BDA0003724510460000071
in the formula, n is the serial number of the collision sensor signal and represents the nth collision sensor signal, and j is the average value filtering parameter.
And the first calculation module is used for integrating the accelerations to obtain the speed variation of each monitoring point in preset time.
And the first calculation module is specifically used for solving the speed variation of the monitoring position of each acceleration sensor according to the reconstructed acceleration signal and the acceleration signal obtained by each acceleration sensor in the integral window. Wherein the speed change amount
Figure BDA0003724510460000072
The calculation formula is as follows:
Figure BDA0003724510460000073
where m is the start time of the integration window and l is the time width of the integration window, i.e., the predetermined time.
The first determining module is used for calculating to obtain the relative coordinates of the collision points in the first direction based on the speed variation of the adjacent monitoring points in at least two first directions and calculating to obtain the relative coordinates of the collision points in the second direction based on the speed variation of the adjacent monitoring points in at least two second directions; wherein, at least one common monitoring point is arranged between the adjacent monitoring points in the two first directions and the adjacent monitoring points in the two second directions.
As shown in fig. 2, taking three adjacent monitoring points, i.e., 3 monitoring points, 5 monitoring points and 6 monitoring points, as an example, the specific determination method of the collision point is illustrated:
the first determining module is specifically configured to determine the first threshold value according to a formula
Figure BDA0003724510460000081
Calculating to obtain the relative coordinates of the collision points in the first direction; and, for the purpose of being in accordance with a formula
Figure BDA0003724510460000082
Calculating to obtain the relative coordinates of the collision points in the second direction; wherein, a is the relative coordinate of the collision point in the first direction, and b is the relative coordinate of the collision point in the second direction;
Figure BDA0003724510460000083
and
Figure BDA0003724510460000084
and x and mu are respectively correction coefficients of the positions of the collision points, wherein the speed variation of the three monitoring points is the speed variation of the three monitoring points.
Wherein, chi and mu are respectively calibration coefficients used for correcting transverse position coordinates and longitudinal position coordinates of a collision point, and the value of the correction coefficient is obtained according to a collision test and a ball impact test of the battery pack and is related to the structure, materials and the like of the battery pack shell; and carrying out consistency comparison according to the collision point position obtained by testing and the collision position obtained by theoretical calculation to obtain the collision point position correction coefficient of the battery pack of the corresponding shell structure and material.
It will be appreciated that the speed variation at the battery pack impact location is generally greater than at other locations, and in some embodiments the processor further comprises: the comparison module is used for comparing the speed variation of each monitoring point after the speed variation of each monitoring point in preset time is obtained;
and selecting at least three monitoring points from large to small according to the speed variation for calculating the position of the collision point.
As described in detail above with reference to the three monitoring points as an example for the specific determination step of the collision point position, more than three monitoring points may be selected, and each of the three monitoring points is calculated according to the collision point position determination formula to obtain a plurality of collision point positions, so that the collision position area of the battery pack can be comprehensively obtained.
Further, as shown in fig. 5, in order to accurately determine the damage degree of the collision position of the battery pack, in some embodiments, after the collision point position of the battery pack is obtained, the collision strength received by the collision point of the battery pack is determined according to the acceleration of the collision point position of the battery pack, which is exemplarily described below, and of course, other collision strength determination schemes may be adopted.
In some embodiments, the processor further comprises: and the second calculation module is used for performing curve fitting according to the accelerations of at least three monitoring points to obtain a first acceleration of the battery pack collision point at a first time point.
Specifically, the collision point acceleration Acc p The fitting method comprises the following steps:
Figure BDA0003724510460000091
where ρ is 1 ，ρ 2 ，β 1 ，β 2 ，λ 1 ，λ 2 The correction coefficients related to the structure, the material and the nonlinear characteristics of the battery pack shell are obtained by calibrating the specific determination mode according to the actual battery pack collision test, and the specific calibration method is not repeated for highlighting the innovative gist of the invention and is similar to the X and mu calibration method.
Specifically, the second calculation module is further configured to calculate a second acceleration of the battery pack collision point at a second time point; the first time point and the second time point are two adjacent frame sampling points;
the processor further comprises: and the collision strength determining module is used for calculating the collision strength received by the battery pack according to the acceleration of at least two adjacent frame sampling points of the collision point of the battery pack in a preset time.
The collision strength determination module is specifically configured to calculate a formula (i.e., a collision strength detection algorithm) according to the collision strength
Figure BDA0003724510460000092
Calculating the collision strength of the battery pack; wherein, U accp (t) the impact strength, Acc, to which the battery pack is subjected p (t) isAcceleration of a battery pack collision point at a certain time point, wherein t is the time point when the vehicle collision occurs, n is the number of sampling frames, and omega 1 ，ω 2 ，ω 3 Respectively, are calibrated constants representing the variation of the tolerance degree of the battery pack with time after the occurrence of the collision. Wherein, ω is 1 ，ω 2 ，ω 3 The battery pack collision test method is also obtained through a battery pack collision test, wherein the shell structure, materials and the like of the battery pack for test are the same as those of the battery pack installed on the vehicle as far as possible, so that the accuracy of the calibration constant is guaranteed, and the accuracy of the actual battery pack collision strength detection is further improved.
The collision strength can also be calculated by the variation of the local velocity, and the calculation formula is as follows:
Figure BDA0003724510460000093
Acc p (t) is the acceleration at a certain point in time at the point of battery pack impact, where t is the point in time when the vehicle impact occurs.
The local deformation can also be calculated using the local displacement. The calculation formula is as follows:
Figure BDA0003724510460000101
Acc p (t) is the acceleration at a certain point in time at the point of battery pack impact, where t is the point in time when the vehicle impact occurs.
And the method can also be determined by combining parameters such as specific power, local speed variation, local deformation and the like.
Specifically, the collision strength determination module is specifically configured to calculate a formula according to a variation of the local velocity:
Figure BDA0003724510460000102
calculating to obtain the local speed variation of the battery pack; wherein Acc p (t) is the acceleration at a certain point in time at the point of battery pack impact,
Figure BDA0003724510460000103
is the local speed variation, t is the time point when the vehicle collision occurs; and determining the collision strength of the battery pack according to the local speed variation.
Or, the collision strength determining module is specifically configured to calculate a formula according to the local displacement variation:
Figure BDA0003724510460000104
calculating to obtain the local displacement variation of the battery pack; determining the collision strength of the battery pack according to the local displacement variation; wherein, Acc p (t) is the acceleration at a certain point in time at the point of battery pack impact, where t is the point in time when the vehicle impact occurs.
Or the collision strength determination module is specifically configured to determine the specific power, the local speed variation and the local displacement variation of the battery pack according to acceleration calculation; and comprehensively determining the collision strength of the battery pack according to the specific power, the local speed variation and the local displacement variation. Thus, compared with a single index, the accuracy of judgment can be improved by comprehensively determining a plurality of indexes.
Here, it is understood that the larger the specific power, the local speed variation amount, and the local displacement variation amount of the battery pack are, the more severe the collision strength is.
In another embodiment, the processor 200 may further determine whether the battery pack is damaged or not and a damage level according to the determined collision position and strength information of the battery pack, and further send a control command to a corresponding operating device or component to perform corresponding safety protection.
In the battery pack collision detection apparatus according to the embodiment of the present invention, the processor may further include a wireless transmission module, and the wireless transmission module communicates with a terminal device, such as a mobile phone, to transmit result information, such as collision strength and position, to a manager or other users.
According to the battery pack collision detection device, the specific position of the battery pack subjected to collision can be better identified and determined by creatively establishing a collision point positioning algorithm based on a multi-collision sensor; in addition, a collision strength detection algorithm based on multiple collision sensors is established, so that the collision strength of the battery pack can be more accurately determined; thereby providing support for replacement, maintenance, power failure, fire extinguishing and the like of the battery pack.
Yet another embodiment of the present invention provides a computer-readable storage medium storing one or more programs, which are executable by one or more processors to implement the workflow steps performed by the collision detection apparatus according to any one of the preceding embodiments.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or device that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, apparatus, article, or device. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, apparatus, article, or device that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
For convenience of description, the above devices are described separately in terms of functional division into various units/modules. Of course, the functionality of the units/modules may be implemented in one or more software and/or hardware implementations of the invention.
It will be understood by those skilled in the art that all or part of the processes of the apparatuses implementing the embodiments described above can be implemented by using a computer program to instruct related hardware, where the program can be stored in a computer-readable storage medium, and when executed, the program can include the processes of the embodiments of the apparatuses described above. The storage medium may also be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A battery pack collision detection apparatus, characterized in that the apparatus comprises: a plurality of crash sensors and a processor;
the collision sensors are respectively connected with the processor and used for acquiring acceleration information of the battery pack;
the processor is at least used for receiving acceleration information which is sent by the collision sensors and is from a plurality of monitoring positions of the battery pack, and determining the collision position of the battery pack based on a collision position detection algorithm according to the acceleration information of the monitoring positions.
2. The apparatus of claim 1, wherein the processor comprises: the device comprises a first data processing module, a first calculating module and a first determining module;
the first data processing module is used for filtering the electric signals of the acceleration information of the battery pack in the preset time, which are sent by each collision sensor, so as to obtain corresponding acceleration;
the first calculation module is used for integrating the accelerated speeds to obtain the speed variation of each monitoring point within the preset time;
the first determining module is used for calculating to obtain the relative coordinates of the collision points in the first direction based on the speed variation of the adjacent monitoring points in at least two first directions and calculating to obtain the relative coordinates of the collision points in the second direction based on the speed variation of the adjacent monitoring points in at least two second directions; wherein, at least one common monitoring point is arranged between the adjacent monitoring points in the two first directions and the adjacent monitoring points in the two second directions.
3. The apparatus according to claim 2, wherein the first determining module is specifically configured to determine the first value according to a formula
Figure FDA0003724510450000011
Calculating to obtain the relative coordinates of the collision points in the first direction; and, for the purpose of being in accordance with a formula
Figure FDA0003724510450000012
Calculating to obtain the relative coordinates of the collision points in the second direction; wherein a is the relative coordinate of the collision point in the first direction (i.e., the abscissa in the orientation shown in fig. 2), and b is the relative coordinate of the collision point in the second direction (the ordinate in the orientation shown in fig. 2);
Figure FDA0003724510450000013
and
Figure FDA0003724510450000014
and x and mu are respectively correction coefficients of the positions of the collision points, and are between 0 and 1.
4. The apparatus of claim 3, wherein the processor further comprises: the comparison module is used for comparing the speed variation of each monitoring point after the speed variation of each monitoring point in preset time is obtained;
and selecting at least three monitoring points from large to small according to the speed variation for calculating the position of the collision point.
5. The apparatus of any of claims 2 to 4, wherein the processor further comprises: and the second calculation module is used for performing curve fitting according to the accelerations of at least three monitoring points to obtain a first acceleration of the battery pack collision point at a first time point.
6. The device of claim 1, wherein the second calculation module is further configured to calculate a second acceleration of the battery pack impact point at a second time point; the first time point and the second time point are two adjacent frame sampling points;
the processor further comprises: and the collision strength determining module is used for determining the collision strength of the battery pack according to the acceleration of at least two adjacent frame sampling points of the collision point of the battery pack in a preset time.
7. The apparatus of claim 1, wherein the collision-strength determination module is specifically configured to, according to a collision-strength calculation formula:
Figure FDA0003724510450000021
calculating to obtain the collision strength of the battery pack; wherein, U accp (t) the impact strength, Acc, to which the battery pack is subjected p (t) is the acceleration of the collision point of the battery pack at a certain time point, wherein t is the time point when the vehicle collision occurs, n is the number of sampling frames, and omega is the number of sampling frames 1 ，ω 2 ，ω 3 Respectively, the calibrated constants represent the variation of the tolerance degree of the battery pack along with the time after the collision; alternatively, the first and second electrodes may be,
the collision strength determination module is specifically configured to calculate a formula according to a variation of the local velocity:
Figure FDA0003724510450000022
calculating to obtain the local speed variation of the battery pack; wherein Acc p (t) is the acceleration at a certain point in time at the point of battery pack impact,
Figure FDA0003724510450000023
is the local speed variation, t is the time point when the vehicle collision occurs;
determining the collision strength of the battery pack according to the local speed variation; alternatively, the first and second electrodes may be,
the collision strength determination module is specifically configured to calculate a formula according to the local displacement variation:
Figure FDA0003724510450000031
calculating to obtain the local displacement variation of the battery pack;
determining the collision strength of the battery pack according to the local displacement variation;
wherein Acc p (t) is the acceleration of the battery pack at a certain time point at the collision point, wherein t is the time point when the vehicle collision occurs; alternatively, the first and second electrodes may be,
the collision strength determining module is specifically used for determining the specific power, the local speed variation and the local displacement variation of the battery pack according to acceleration calculation;
and comprehensively determining the collision strength of the battery pack according to the specific power, the local speed variation and the local displacement variation.
8. The device of claim 1, wherein the crash sensor is an acceleration sensor, and a plurality of crash sensor arrays are disposed on a surface of the battery pack.
9. The device of claim 1 or 8, wherein the battery pack comprises a housing and a cell module, the cell module is encapsulated in the housing, and the plurality of collision sensors are arranged in a rectangular array on the inner side of the housing and in the interlayer; alternatively, the first and second electrodes may be,
the battery pack is characterized in that: including casing and electric core module, electric core module encapsulate in the casing, electric core module includes a plurality of range upon range of electric cores of laying, and is a plurality of collision sensor is rectangular array and lays in the intermediate layer between the electric core.
10. A battery pack collision detection method is characterized by comprising the following steps:
acquiring acceleration information of a plurality of monitoring positions of the battery pack;
and determining the collision position of the battery pack based on a collision position detection algorithm according to the acceleration information of the monitoring positions.
CN202210762285.7A 2022-03-28 2022-06-30 Battery pack collision detection device and method Pending CN114889488A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116788049A (en) * 2023-08-17 2023-09-22 宁德时代新能源科技股份有限公司 Collision handling method, device, apparatus, storage medium, and power consumption device
CN116901711A (en) * 2023-09-14 2023-10-20 宁德时代新能源科技股份有限公司 Method and device for processing collision detection of battery
CN117308863A (en) * 2023-11-22 2023-12-29 宁德时代新能源科技股份有限公司 Method and device for detecting collision damage of battery pack, electronic equipment and storage medium

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116788049A (en) * 2023-08-17 2023-09-22 宁德时代新能源科技股份有限公司 Collision handling method, device, apparatus, storage medium, and power consumption device
CN116788049B (en) * 2023-08-17 2023-12-05 宁德时代新能源科技股份有限公司 Collision handling method, device, apparatus, storage medium, and power consumption device
CN116901711A (en) * 2023-09-14 2023-10-20 宁德时代新能源科技股份有限公司 Method and device for processing collision detection of battery
CN116901711B (en) * 2023-09-14 2024-02-06 宁德时代新能源科技股份有限公司 Method and device for processing collision detection of battery
CN117308863A (en) * 2023-11-22 2023-12-29 宁德时代新能源科技股份有限公司 Method and device for detecting collision damage of battery pack, electronic equipment and storage medium
CN117308863B (en) * 2023-11-22 2024-04-12 宁德时代新能源科技股份有限公司 Method and device for detecting collision damage of battery pack, electronic equipment and storage medium

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