CN111900499B - Power battery protection method and device, vehicle and storage medium - Google Patents

Power battery protection method and device, vehicle and storage medium Download PDF

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Publication number
CN111900499B
CN111900499B CN202010662422.0A CN202010662422A CN111900499B CN 111900499 B CN111900499 B CN 111900499B CN 202010662422 A CN202010662422 A CN 202010662422A CN 111900499 B CN111900499 B CN 111900499B
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module
voltage
potential side
battery
high potential
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CN111900499A (en
Inventor
李碧雄
王杭挺
王燕乐
郑立奇
许达理
刘安龙
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Guangzhou Xiaopeng Motors Technology Co Ltd
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Guangzhou Xiaopeng Automobile Manufacturing Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4207—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells 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
    • 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
    • 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
    • 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
    • H01M10/488—Cells or batteries combined with indicating means for external visualization of the condition, e.g. by change of colour or of light density
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Secondary Cells (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The embodiment of the invention relates to a power battery protection method and device, a vehicle and a storage medium, wherein the method comprises the following steps: monitoring the voltage difference between the battery modules; calculating the resistance value between the modules according to the voltage difference and the circuit current; when the resistance value exceeds a first threshold value, performing primary early warning; and when the resistance value exceeds a second threshold value, alarming. By the method, the abnormal connection condition of the electric connection can be effectively recognized in advance, the use safety of the vehicle is guaranteed, meanwhile, slight abnormality can be recognized in advance under the condition that a customer does not sense, the use panic of the customer is avoided, the use experience feeling of the vehicle is improved, and the effect of preventing false alarm can be achieved by early warning and detailed data investigation.

Description

Power battery protection method and device, vehicle and storage medium
Technical Field
The invention relates to the technical field of power batteries, in particular to a power battery protection method and device, a vehicle and a storage medium.
Background
The electric automobile battery package includes a plurality of battery module usually, and the electric connection of present battery module all adopts bolt and nut to install fixed form basically, and when the moment of torsion decay appears in bolt and nut, the contact resistance can the grow of electricity connection, when the electric connection surface has the foreign matter, contact resistance also can the grow. When the contact resistance of the electric connection becomes large, the heat productivity of the electric connection is increased, the output power of the battery pack is reduced, the battery pack can be caused to be on fire or even explode under the more serious condition, and the personal safety and the property safety are seriously influenced.
Disclosure of Invention
The embodiment of the invention discloses a power battery protection method and device, a vehicle and a storage medium, which can solve at least one problem in the prior art.
The first aspect of the embodiment of the invention discloses a power battery protection method, which comprises the following steps:
monitoring the voltage difference between the battery modules;
calculating the resistance value between the modules according to the voltage difference and the circuit current;
when the resistance value exceeds a first threshold value, performing primary early warning;
and when the resistance value exceeds a second threshold value, alarming.
The second aspect of the embodiment of the invention discloses a power battery protection device, which comprises:
the detection module is used for monitoring the voltage difference between the battery modules;
the calculating module is used for calculating the resistance value between the modules according to the voltage difference and the circuit current;
the primary early warning module is used for carrying out primary early warning when the resistance value exceeds a first threshold value;
and the alarm module is used for giving an alarm when the resistance value exceeds a second threshold value.
In a third aspect of the embodiment of the invention, a vehicle is disclosed, which includes the power battery protection device disclosed in the second aspect of the embodiment of the invention.
A fourth aspect of the embodiments of the present invention discloses a computer-readable storage medium that stores a computer program, where the computer program causes a computer to execute the power battery protection method disclosed in the first aspect of the embodiments of the present invention.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: the abnormal connection condition of the electric connection can be effectively recognized in advance, the use safety of the vehicle is guaranteed, meanwhile, slight abnormality can be recognized in advance under the condition that a customer does not sense, the use panic of the customer is avoided, the use experience of the vehicle is improved, and through early warning, detailed data investigation is carried out again, and the effect of preventing false alarm can be achieved.
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 embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a first hardware diagram of a battery system module of a power battery protection method according to an embodiment of the present invention;
fig. 2 is a hardware schematic diagram of a battery system module of a power battery protection method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a power battery protection method according to an embodiment of the present invention;
fig. 4 is a schematic block diagram of a power battery protection device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
It should be noted that the terms "first", "second", "third" and "fourth" etc. in the description and claims of the present invention are used for distinguishing different objects, and are not used for describing a specific order. The terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the embodiment of the invention, the battery pack is composed of modules, bolts and nuts are arranged among the modules for installation and fixation, the resistance of the bolts and the nuts can be changed, and safety problems can be caused after the change, so that the resistance condition among the modules needs to be identified, and whether potential safety hazards exist is further judged.
For convenience of description, an embodiment of the present invention is described with two modules connected in series and adjacent to each other, as shown in fig. 1, which is a hardware schematic diagram of a battery system module of a power battery protection method according to an embodiment of the present invention, a module 1 includes four battery cells U1, U2, U3, and U4, a module 2 includes four battery cells U5, U6, U7, and U8, the module 1 is connected in series with the module 2, the module 1 and the module 2 include a high voltage electrical connection therebetween, the high voltage electrical connection may be, for example, a bolt-nut connection, and a BMS performs voltage sampling at two ends of the battery cells to obtain the following sampling voltages: as can be seen from the above description, the sampling voltage of each cell can be calculated from the voltage difference between two sampling points on both sides of the cell, that is, U1 is equal to V0-V1, and U2 is equal to V1-V2 (assuming a discharging process), and so on. In this case, the voltage U of the high-voltage electrical connectionx0The voltage V4 on the low potential side of the high potential module of the battery modules and the voltage V5 on the high potential side of the low potential module of the battery modules can be calculated, namely, Ux0When the voltage U of the high-voltage electrical connection is obtained, V4-V5 (assuming a discharge process)x0Then, the resistance of the high-voltage electrical connection can be calculated, specifically:
R＝(V4-V5)/I
wherein the content of the first and second substances,
r is the resistance value of the high-voltage electric connection;
i is the current value in the circuit.
Wherein, R can be regarded as two parts of resistance composition, and one part is resistance R electrically connected with internal resistancein(ii) a This part of the resistance is generally constant, determined by the design of the electrical connection itself; another part is the resistance R of the contact resistancet，RtDepending on the state of electrical connection, when the electrical connection is normal, R is usually the sametSmall when the electrical connection is abnormal, e.g. loose or foreign matter, RtAnd generally become larger.
Due to RtHas the characteristic of representing the electric connection state and further shows the change of R, so in the embodiment of the invention,the state of the electric connection is judged by monitoring the state of the R, and the specific mode is as follows:
monitoring the resistance value R of the high-voltage electric connection, and carrying out primary early warning when the resistance value exceeds a first threshold value;
in some embodiments of the present invention, the first threshold may specifically be, for example:
Rth1＝Rin+Rtuwherein:
Rth1is the first threshold;
Rina resistance value that is the internal resistance of the electrical connection;
Rtuthe upper limit value of the resistance value of the contact resistance in the normal state.
When the resistance value R of the high-voltage electric connection exceeds the first threshold value, it can be judged that the high-voltage electric connection is possibly in fault, and at this time, primary early warning needs to be performed, specifically, for example, the battery safety monitoring strength in other aspects is improved, or the current state that R exceeds the first threshold value is used as an evaluation index to judge whether the high-voltage electric connection is in fault together with other evaluation indexes.
When the resistance value exceeds a second threshold value, alarming;
in some embodiments of the present invention, the second threshold may specifically be, for example:
Rth2＝Rin+Ralwherein:
Rth2is the second threshold;
Rina resistance value that is the internal resistance of the electrical connection;
Ralalarming a threshold value for the contact resistance;
Ral＞Rtu。
when the resistance value R of the high-voltage electric connection is monitored to continue rising after exceeding the first threshold value, the probability that the high-voltage electric connection fails is continuously increased, and when the resistance value R is large to a certain extent, a numerical value is generally obtained according to the previous calibration or test, namely R in some embodiments of the inventionin+RalAt this time, it may be considered that the fault of the high-voltage electrical connection is basically confirmed and needs to be processed, and then an alarm needs to be performed, specifically, for example, a background data monitoring center may notify that the vehicle needs to be repaired.
By the method, the abnormal connection condition of the electric connection can be effectively recognized in advance, the use safety of the vehicle is guaranteed, meanwhile, slight abnormality can be recognized in advance under the condition that a customer does not sense, the use panic of the customer is avoided, the use experience feeling of the vehicle is improved, and the effect of preventing false alarm can be achieved by early warning and detailed data investigation.
In other embodiments of the present invention, the number of voltage sampling terminals in the module may be less, fig. 2 is a hardware schematic diagram of a battery system module of a power battery protection method according to an embodiment of the present invention, as shown in fig. 2, a module 1 includes four battery cells U1, U2, U3, and U4, a module 2 includes four battery cells U5, U6, U7, and U8, the module 1 is connected in series with the module 2, the module 1 and the module 2 include a high voltage electrical connection, the high voltage electrical connection may be, for example, a bolt-nut connection, and a BMS performs voltage sampling at two ends of the battery cells to obtain the following sampling voltages: as can be seen from the above description, the sampling voltage of each cell can be calculated from the voltage difference between two sampling points on both sides of the cell, that is, U1 ═ V1-V0, U2 ═ V2-V1, and so on. In this case, however, the voltage U of the high-voltage electrical connectionx0The voltage of the battery cell at the edge of the module (U4 and U8) cannot be directly and accurately calculated, so the voltage calculation of the battery cell at the edge of the module is calibrated in the embodiment of the present invention, and the specific calibration method may be, for example:
when charging, because high voltage electricity is connected the electric potential low left side and high right side, and is unanimous with electric core potential difference direction, so:
U4＝V5-V3-IRst
wherein R isstCompensating resistance values for high-voltage electric connection, and obtaining the compensation resistance values by averaging a large amount of actual test data;
when discharging, because high voltage electricity is connected the electric potential height about, and is opposite with electric core potential difference direction, so:
U4＝V5-V3+IRst
therefore, when the high-voltage electrical connection is abnormal, the contact resistance is large, the voltage of U4 is high during charging, and the voltage of U4 is low during discharging.
Since the cells usually meet the requirement of consistency, the voltage U of the high-voltage electrical connectionx1The voltage V3 on the high potential side of the electric core on the low potential side in the high potential module in the battery module, the voltage V5 on the high potential side of the electric core on the high potential side in the low potential module in the battery module, and the voltage V6 on the low potential side of the electric core on the high potential side in the low potential module in the battery module can be calculated, and the calculation result is specifically that the calculation result is Ux1When the voltage U of the high-voltage electrical connection is obtained, (assuming a discharge process), V3-V5) - (V5-V6)x1Then, the resistance of the high-voltage electrical connection can be calculated, specifically:
R＝((V3-V5)-(V5-V6))/I
wherein the content of the first and second substances,
r is the resistance value of the high-voltage electric connection;
i is the current value in the circuit.
The scheme of the embodiment of fig. 2 at least comprises the following beneficial effects: the sampling lines are fewer, and the wire harness cost is lower; fewer on-chip sampling ports are required and therefore the on-chip sampling ports are more efficiently used.
An embodiment of the present invention provides a method for protecting a power battery, and as shown in fig. 3, a schematic flow diagram of the method for protecting a power battery provided in the embodiment of the present invention includes:
301. monitoring the voltage difference between the battery modules;
302. calculating the resistance value between the modules according to the voltage difference and the circuit current;
303. when the resistance value exceeds a first threshold value, performing primary early warning;
304. and when the resistance value exceeds a second threshold value, alarming.
Wherein the content of the first and second substances,
the step of monitoring a voltage difference between the battery modules includes:
acquiring the voltage of a low potential side in a high potential module in the battery modules;
acquiring the voltage of a high potential side in a low potential module in the battery modules;
calculate Ux0＝Vx0-Vy0Wherein:
Ux0the voltage difference between the battery modules is obtained;
Vx0is a voltage on the low potential side;
Vy0is the voltage on the high potential side.
Another step of monitoring a voltage difference between the battery modules may include:
acquiring the voltage of a high potential side of an electric core at a low potential side in a high potential module in the battery module;
acquiring the voltage of a high potential side of an electric core on the high potential side in a low potential module in the battery module;
acquiring the voltage of a low potential side of an electric core on a high potential side in a low potential module in the battery module;
calculate Ux0＝(Vx1–Vyh)-(Vyh–Vyl) Wherein:
Ux0the voltage difference between the battery modules is obtained;
Vx1the voltage of the high potential side of the battery core at the low potential side in the high potential module in the battery module is obtained;
Vyhthe voltage of the high potential side of the electric core on the high potential side in the low potential module in the battery module is obtained;
Vylthe voltage of the low potential side of the battery core on the high potential side in the low potential module in the battery module is obtained.
Wherein the content of the first and second substances,
the resistance value between the modules is specifically as follows:
R＝Rin+Rtwhich isThe method comprises the following steps:
r is the resistance value between the modules;
Rina resistance value for electrically connecting the internal resistances;
Rtis the resistance value of the contact resistance.
Wherein the content of the first and second substances,
the first threshold specifically is:
Rth1＝Rin+Rtuwherein:
Rth1is the first threshold;
Rina resistance value that is the internal resistance of the electrical connection;
Rtuthe upper limit value of the resistance value of the contact resistance in the normal state.
Wherein the content of the first and second substances,
the second threshold specifically is:
Rth2＝Rin+Ralwherein:
Rth2is the second threshold;
Rina resistance value that is the internal resistance of the electrical connection;
Raland alarming a threshold value for the contact resistance.
Wherein the content of the first and second substances,
the resistance value of the contact resistor is inversely proportional to the locking torque of the bolt and the nut.
Wherein the content of the first and second substances,
the primary early warning comprises information used for prompting that the battery pack needs to be checked and evaluated;
the alarm includes information for prompting that the battery pack requires maintenance.
By the method, the abnormal connection condition of the electric connection can be effectively recognized in advance, the use safety of the vehicle is guaranteed, meanwhile, slight abnormality can be recognized in advance under the condition that a customer does not sense, the use panic of the customer is avoided, the use experience feeling of the vehicle is improved, and the effect of preventing false alarm can be achieved by early warning and detailed data investigation.
An embodiment of the present invention further provides a power battery protection device, as shown in fig. 4, which is a schematic module diagram of the power battery protection device provided in the embodiment of the present invention, and the power battery protection device includes:
a monitoring module 401 for monitoring a voltage difference between the battery modules;
a calculating module 402, configured to calculate a resistance value between modules according to the voltage difference and the circuit current;
a primary early warning module 403, configured to perform primary early warning when the resistance value exceeds a first threshold;
and an alarm module 404, configured to alarm when the resistance value exceeds a second threshold.
Wherein the content of the first and second substances,
the monitoring module is specifically configured to:
acquiring the voltage of a low potential side in a high potential module in the battery modules;
acquiring the voltage of a high potential side in a low potential module in the battery modules;
calculate Ux0＝Vx0-Vy0Wherein:
Ux0the voltage difference between the battery modules is obtained;
Vx0is a voltage on the low potential side;
Vy0is the voltage on the high potential side.
Another monitoring module may be configured to:
acquiring the voltage of a high potential side of an electric core at a low potential side in a high potential module in the battery module;
acquiring the voltage of a high potential side of an electric core on the high potential side in a low potential module in the battery module;
acquiring the voltage of a low potential side of an electric core on a high potential side in a low potential module in the battery module;
calculate Ux0＝(Vx1–Vyh)-(Vyh–Vyl) Wherein:
Ux0the voltage difference between the battery modules is obtained;
Vx1is that it isThe voltage of the high potential side of the electric core on the low potential side in the high potential module in the battery module;
Vyhthe voltage of the high potential side of the electric core on the high potential side in the low potential module in the battery module is obtained;
Vylthe voltage of the low potential side of the battery core on the high potential side in the low potential module in the battery module is obtained.
Wherein the content of the first and second substances,
the calculation module is specifically configured to calculate:
R＝Rin+Rtwherein:
r is the resistance value between the modules;
Rina resistance value for electrically connecting the internal resistances;
Rtis the resistance value of the contact resistance.
Wherein the content of the first and second substances,
the first threshold specifically is:
Rth1＝Rin+Rtuwherein:
Rth1is the first threshold;
Rina resistance value that is the internal resistance of the electrical connection;
Rtuthe upper limit value of the resistance value of the contact resistance in the normal state.
Wherein the content of the first and second substances,
the second threshold specifically is:
Rth2＝Rin+Ralwherein:
Rth2is the second threshold;
Rina resistance value that is the internal resistance of the electrical connection;
Raland alarming a threshold value for the contact resistance.
Wherein the content of the first and second substances,
the resistance value of the contact resistor is inversely proportional to the locking torque of the bolt and the nut.
Wherein the content of the first and second substances,
the primary early warning comprises information used for prompting that the battery pack needs to be checked and evaluated;
the alarm includes information for prompting that the battery pack requires maintenance.
Through the device, the abnormal connection condition of the electric connection can be effectively recognized in advance, the use safety of the vehicle is guaranteed, meanwhile, slight abnormality can be recognized in advance under the condition that a customer does not sense, the situation that the customer uses panic is avoided, the experience feeling of the vehicle use is improved, in addition, through early warning, detailed data investigation is carried out again, and the effect of preventing false alarm can be achieved.
The embodiment of the invention discloses a vehicle which comprises any one power battery protection device.
The embodiment of the invention also discloses a computer readable storage medium which stores a computer program, wherein the computer program enables a computer to execute any one of the power battery protection methods.
It will be understood by those skilled in the art that all or part of the steps in the methods of the embodiments described above may be implemented by hardware instructions of a program, and the program may be stored in a computer-readable storage medium, where the storage medium includes Read-Only Memory (ROM), Random Access Memory (RAM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), One-time Programmable Read-Only Memory (OTPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Compact Disc Read-Only Memory (CD-ROM), or other Memory, such as a magnetic disk, or a combination thereof, A tape memory, or any other medium readable by a computer that can be used to carry or store data.
The above detailed description is provided for the protection method and apparatus, the vehicle, and the storage medium of the power battery disclosed in the embodiments of the present invention, and the principle and the implementation of the present invention are explained in the present document by applying specific examples, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (8)

1. A power battery protection method is characterized by comprising the following steps:
monitoring the voltage difference between the battery modules;
calculating the resistance value between the modules according to the voltage difference and the circuit current;
when the resistance value exceeds a first threshold value, performing primary early warning;
when the resistance value exceeds a second threshold value, alarming;
the step of monitoring the voltage difference between the battery modules comprises:
acquiring the voltage of a low potential side in a high potential module in the battery modules;
acquiring the voltage of a high potential side in a low potential module in the battery modules;
calculate Ux0＝Vx0-Vy0Wherein:
Ux0the voltage difference between the battery modules is obtained;
Vx0is a voltage on the low potential side;
Vy0is a voltage on the high potential side;
alternatively, the first and second electrodes may be,
the step of monitoring the voltage difference between the battery modules comprises:
acquiring the voltage of a high potential side of an electric core at a low potential side in a high potential module in the battery module;
acquiring the voltage of a high potential side of an electric core on the high potential side in a low potential module in the battery module;
acquiring the voltage of a low potential side of an electric core on a high potential side in a low potential module in the battery module;
calculate Ux0＝(Vx1–Vyh)-(Vyh–Vyl) Wherein:
Ux0the voltage difference between the battery modules is obtained;
Vx1the voltage of the high potential side of the battery core at the low potential side in the high potential module in the battery module is obtained;
Vyhthe voltage of the high potential side of the electric core on the high potential side in the low potential module in the battery module is obtained;
Vylthe voltage of the low potential side of the battery core on the high potential side in the low potential module in the battery module is obtained.
2. The power battery protection method of claim 1, wherein:
the resistance value between the modules is specifically as follows:
R＝Rin+Rtwherein:
r is the resistance value between the modules;
Rina resistance value for electrically connecting the internal resistances;
Rtis the resistance value of the contact resistance.
3. The power battery protection method of claim 2, wherein:
the first threshold specifically is:
Rth1＝Rin+Rtuwherein:
Rth1is the first threshold;
Rina resistance value that is the internal resistance of the electrical connection;
Rtuthe upper limit value of the resistance value of the contact resistance in the normal state.
4. The power battery protection method of claim 3, wherein:
the second threshold specifically is:
Rth2＝Rin+Ralwherein:
Rth2is the second threshold value；
RinA resistance value that is the internal resistance of the electrical connection;
Raland alarming a threshold value for the contact resistance.
5. The power battery protection method according to any one of claims 2 to 4, characterized in that:
the battery modules are connected through bolts and nuts;
the resistance value of the contact resistor is inversely proportional to the locking torque of the bolt and the nut.
6. The power battery protection method of claim 1, wherein:
the primary early warning comprises information used for prompting that the battery pack needs to be checked and evaluated;
the alarm includes information for prompting that the battery pack requires maintenance.
7. A power battery protection device, comprising:
the detection module is used for monitoring the voltage difference between the battery modules;
the calculating module is used for calculating the resistance value between the modules according to the voltage difference and the circuit current;
the primary early warning module is used for carrying out primary early warning when the resistance value exceeds a first threshold value;
the alarm module is used for giving an alarm when the resistance value exceeds a second threshold value;
the step of monitoring the voltage difference between the battery modules comprises:
acquiring the voltage of a low potential side in a high potential module in the battery modules;
acquiring the voltage of a high potential side in a low potential module in the battery modules;
calculate Ux0＝Vx0-Vy0Wherein:
Ux0the voltage difference between the battery modules is obtained;
Vx0is a voltage on the low potential side;
Vy0is a voltage on the high potential side;
alternatively, the first and second electrodes may be,
the step of monitoring the voltage difference between the battery modules comprises:
acquiring the voltage of a high potential side of an electric core at a low potential side in a high potential module in the battery module;
acquiring the voltage of a high potential side of an electric core on the high potential side in a low potential module in the battery module;
acquiring the voltage of a low potential side of an electric core on a high potential side in a low potential module in the battery module;
calculate Ux0＝(Vx1–Vyh)-(Vyh–Vyl) Wherein:
Ux0the voltage difference between the battery modules is obtained;
Vx1the voltage of the high potential side of the battery core at the low potential side in the high potential module in the battery module is obtained;
Vyhthe voltage of the high potential side of the electric core on the high potential side in the low potential module in the battery module is obtained;
Vylthe voltage of the low potential side of the battery core on the high potential side in the low potential module in the battery module is obtained.
8. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, wherein the computer program causes a computer to execute the power battery protection method according to any one of claims 1 to 6.
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