CN107861069B - Detection circuit and method, detector, battery device, vehicle and computer-readable storage medium - Google Patents

Detection circuit and method, detector, battery device, vehicle and computer-readable storage medium Download PDF

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Publication number
CN107861069B
CN107861069B CN201710993673.5A CN201710993673A CN107861069B CN 107861069 B CN107861069 B CN 107861069B CN 201710993673 A CN201710993673 A CN 201710993673A CN 107861069 B CN107861069 B CN 107861069B
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temperature
resistor
assembly
voltage
component
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CN107861069A (en
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许佳
但志敏
侯贻真
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Ningde Shidai Runzhi Software Technology Co ltd
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Contemporary Amperex Technology Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
    • 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
    • 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
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
    • 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)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The embodiment of the invention provides a detection circuit and method, a detector, a battery device, a transport tool and a computer readable storage medium, which are applied to the technical field of batteries. In an embodiment of the present invention, a detection circuit includes: the current divider comprises a resistor, a current input component of the resistor and a current output component of the resistor; the temperature acquisition device is used for acquiring a first temperature of the current input assembly and a second temperature of the current output assembly; the voltage acquisition device is used for acquiring the voltage of the resistor; and the processing component is used for obtaining the calibration voltage of the resistor according to the first temperature, the second temperature and the voltage of the resistor. Therefore, the technical scheme provided by the embodiment of the invention can eliminate the influence of the thermoelectric force on the current detection value by the current divider and improve the detection precision.

Description

Detection circuit and method, detector, battery device, vehicle and computer-readable storage medium
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of battery technologies, and in particular, to a detection circuit and method, a detector, a battery device, a transportation vehicle, and a computer-readable storage medium.
[ background of the invention ]
The electric automobile replacing fuel oil automobile becomes the development trend of automobile industry, so how to effectively monitor the real-time current of the battery pack with high precision is very important for the continuous mileage, the service life and the use safety of the electric automobile. And reducing the error of the sampled current value from the real current is the most fundamental requirement of current detection.
Currently, the current detection can be realized by connecting a shunt in series in a loop to be detected. Specifically, referring to fig. 1, which is a schematic top view of a shunt in the prior art, as shown in fig. 1, a resistor 211 with a small resistance value is disposed in the shunt 210, and a current input component 212 of the resistor 211 and a current output component 213 of the resistor 211 are disposed on two sides of the resistor 211. As shown in fig. 1, a first mounting hole 121 is formed in the current input member 212, a second mounting hole 131 is formed in the current output member 213, and the shunt 210 is connected to other electric devices, such as an external harness or an external connection copper bar, through the first mounting hole 121 and the second mounting hole 131.
In the prior art, as shown in fig. 1, when the current detection is implemented by the current divider 210, the current flowing through the current divider 210 can be obtained by obtaining the voltage drop across the current divider 210 and obtaining the quotient of the voltage drop and the resistance of the resistor 211.
However, when the current detection is actually implemented by the shunt, the actual voltage sampling points are generally disposed on both sides of the resistor. As shown in fig. 1, two voltage sampling points of the shunt 210 are points a and B in fig. 1, where point a is located on the input element 212 of the resistor and in contact with the resistor 211, and point B is located on the output element 213 of the resistor and in contact with the resistor 211.
In addition, when two metals are contacted, electron overflow work and electron concentration in the metals are different due to different temperatures, so that a contact potential difference, namely a temperature difference electromotive force, is generated. As shown in fig. 1, a thermoelectromotive force exists between the current input element 212 and the resistor 211, and a thermoelectromotive force also exists between the current output element 213 and the resistor 211.
That is, in the prior art, the voltage drop across the shunt actually includes the voltage of the resistor and the thermoelectromotive force. Based on this, in the prior art, when current detection is realized through the shunt, the detection accuracy of the detected current is low due to neglecting the influence of the thermoelectric force on the voltage of the collected resistor.
[ summary of the invention ]
In view of this, embodiments of the present invention provide a detection circuit and method, a detector, a battery device, a transportation vehicle, and a computer readable storage medium, so as to eliminate the influence of the thermoelectric force on the current detection value by the shunt and improve the detection accuracy.
In a first aspect, an embodiment of the present invention provides a detection circuit, including:
the current divider comprises a resistor, a current input component of the resistor and a current output component of the resistor;
the temperature acquisition device is used for acquiring a first temperature of the current input assembly and a second temperature of the current output assembly;
the voltage acquisition device is used for acquiring the voltage of the resistor;
and the processing component is used for obtaining the calibration voltage of the resistor according to the first temperature, the second temperature and the voltage of the resistor.
In a second aspect, an embodiment of the present invention provides a detection circuit, including:
the temperature acquisition device is used for acquiring a first temperature of a current input assembly of the resistor and a second temperature of a current output assembly of the resistor;
the voltage acquisition device is used for acquiring the voltage of the resistor;
and the processing component is used for obtaining the calibration voltage of the resistor according to the first temperature, the second temperature and the voltage of the resistor.
The above-described aspects and any possible implementations further provide an implementation, where the temperature acquisition device includes:
a first end of the first temperature acquisition assembly is used for acquiring a first temperature of the current input assembly, and a second end of the first temperature acquisition assembly is connected to the processing assembly;
the first end of the second temperature acquisition assembly is used for acquiring the second temperature of the current output assembly, and the second end of the second temperature acquisition assembly is connected to the processing assembly.
The above-described aspect and any possible implementation further provide an implementation, where the temperature acquisition device further includes:
the first analog-to-digital conversion assembly is connected between the second end of the first temperature acquisition assembly and the processing assembly and is used for converting the analog electric signal of the first temperature into a digital signal and transmitting the digital signal to the processing assembly; and/or the presence of a gas in the gas,
and the second analog-to-digital conversion component is connected between the second end of the second temperature acquisition component and the processing component and is used for converting the analog electric signal of the second temperature into a digital signal and transmitting the digital signal to the processing component.
The above-described aspects and any possible implementations further provide an implementation, where the voltage acquisition device includes:
the voltage acquisition assembly, the first end of voltage acquisition assembly be used for gathering on the current input assembly with the first voltage of resistance contact position, the second end of voltage acquisition assembly be used for gathering on the current output assembly with the second voltage of resistance contact position, the third end of voltage acquisition assembly is connected to processing component.
The above-described aspects and any possible implementation further provide an implementation, where the voltage acquisition device further includes:
and the third analog-to-digital conversion component is connected between the second end of the voltage acquisition component and the processing component and is used for acquiring a difference value between the analog electric signal of the first voltage and the analog electric signal of the second voltage, converting the difference value into a digital signal and transmitting the digital signal to the processing component.
The above aspect and any possible implementation further provide an implementation in which the current input component is made of the same material as the current output component.
The above aspects and any possible implementations further provide an implementation in which the current input component is made of a material different from a material of which the current output component is made.
The above-described aspect and any possible implementation further provide an implementation, where the temperature acquisition device further includes:
the first end of the third temperature acquisition assembly is used for acquiring the third temperature of the resistor, and the second end of the third temperature acquisition assembly is connected to the processing assembly.
The above-described aspect and any possible implementation further provide an implementation, where the temperature acquisition device further includes:
and the fourth analog-to-digital conversion component is connected between the second end of the third temperature acquisition component and the processing component and is used for converting the analog electric signal of the third temperature into a digital signal and transmitting the digital signal to the processing component.
In a third aspect, an embodiment of the present invention provides a circuit board, including: the detection circuit obtained by any one of the above-mentioned implementation manners.
In a fourth aspect, an embodiment of the present invention provides a detector, including: the detection circuit obtained by any one of the above-mentioned implementation manners.
In a fifth aspect, an embodiment of the present invention provides a battery device, including:
a battery;
the detection circuit obtained in any one of the above-described embodiments is provided between the positive electrode and the negative electrode of the battery.
In a sixth aspect, an embodiment of the present invention provides a transportation vehicle, including: the detection circuit obtained by any one of the above-mentioned implementation manners.
One of the above technical solutions has the following beneficial effects:
in the embodiment of the invention, the temperature acquisition device in the detection circuit acquires the first temperature of the current input component of the resistor and the second temperature of the current output component of the resistor, so that the temperature difference electromotive force between different materials on the current divider can be acquired based on the first temperature and the second temperature, the voltage of the resistor is calibrated based on the acquired temperature difference electromotive force, and the calibration voltage is acquired; based on this, the detection of the voltage is realized by the detection circuit. Therefore, when the scheme is applied to the current divider, the technical scheme provided by the embodiment of the invention can realize the influence on the current detection based on the obtained calibration voltage, and improve the detection precision.
In a seventh aspect, an embodiment of the present invention provides a detection method, which is applied to a detection circuit obtained in any one of the foregoing implementation manners, and executed on a processing component, and includes:
collecting a first temperature of the current input assembly and a second temperature of the current output assembly, and collecting a voltage of the resistor;
and obtaining the calibration voltage of the resistor according to the first temperature, the second temperature and the voltage of the resistor.
The above aspect and any possible implementation manner further provide an implementation manner, where obtaining a calibration voltage of the resistor according to the first temperature, the second temperature, and the voltage of the resistor includes:
acquiring the temperature difference electromotive force among the current input assembly, the resistor and the current output assembly according to the first temperature and the second temperature;
and obtaining the calibration voltage of the resistor according to the temperature difference electromotive force and the voltage of the resistor.
The aspect and any possible implementation described above further provides an implementation when the current input component is made of a material different from that of the current output component;
the method further comprises the following steps:
a third temperature of the resistor is collected.
The above aspect and any possible implementation manner further provide an implementation manner for acquiring a thermoelectric force between the current input component, the resistor and the current output component, including:
obtaining a first temperature difference electromotive force between the resistor and the current input assembly according to the first temperature and the third temperature;
obtaining a second temperature difference electromotive force between the resistor and the current output assembly according to the second temperature and the third temperature;
and acquiring the sum of the first temperature difference electromotive force and the second temperature difference electromotive force to obtain the temperature difference electromotive force among the current input assembly, the resistor and the current output assembly.
The above aspect and any possible implementation further provide an implementation when the current input component is made of the same material as the current output component;
according to the first temperature and the second temperature, acquiring the temperature difference electromotive force among the current input assembly, the resistor and the current output assembly, and the temperature difference electromotive force comprises the following steps:
acquiring a temperature difference between the first temperature and the second temperature;
and acquiring the product of the temperature difference coefficient between the resistor and the current input assembly and the temperature difference to obtain the temperature difference electromotive force between the current input assembly, the resistor and the current output assembly.
The above aspect and any possible implementation manner further provide an implementation manner, in which obtaining a calibration voltage of the resistor according to the bemf and the voltage of the resistor includes:
and acquiring the difference between the voltage of the resistor and the thermoelectromotive force to obtain the calibration voltage of the resistor.
The above-described aspects and any possible implementations further provide an implementation, and the method further includes:
and obtaining the quotient of the calibration voltage of the resistor and the resistance value of the resistor to obtain the current flowing through the resistor.
In an eighth aspect, an embodiment of the present invention provides a computer-readable storage medium, including: computer-executable instructions for performing the detection method of any of the above implementations when executed.
One of the above technical solutions has the following beneficial effects:
in the embodiment of the invention, the temperature acquisition device in the detection circuit acquires the first temperature of the current input component of the resistor and the second temperature of the current output component of the resistor, so that the temperature difference electromotive force between different materials on the current divider can be acquired based on the first temperature and the second temperature, the voltage of the resistor is calibrated based on the acquired temperature difference electromotive force, and the calibration voltage is acquired; based on this, the detection of the voltage is achieved by the detection method. Therefore, when the scheme is applied to the current divider, the technical scheme provided by the embodiment of the invention can realize the influence on the current detection based on the obtained calibration voltage, and improve the detection precision.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of 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 to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic top view of a shunt according to the prior art;
fig. 2 is a schematic structural diagram of a first embodiment of a detection circuit according to the present invention;
fig. 3 is a schematic structural diagram of a second embodiment of a detection circuit according to the present invention;
fig. 4 is a schematic structural diagram of a third embodiment of a detection circuit according to the present invention;
FIG. 5 is a schematic flow chart of a detection method provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of the principle of the generation of a thermoelectromotive force;
FIG. 7 is a schematic view of the mounting structure of the diverter of FIG. 1;
fig. 8 is a schematic structural diagram of a fourth embodiment of a detection circuit according to the present invention;
FIG. 9 is a schematic structural diagram of a circuit board according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of a detector according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a battery system according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a transportation vehicle according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided 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 terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three 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.
It should be understood that although the terms first, second, third, etc. may be used to describe the temperature acquisition assembly, etc. in embodiments of the present invention, the temperature acquisition assemblies should not be limited to these terms. These terms are only used to distinguish the temperature acquisition components from one another. For example, a first temperature acquisition assembly may also be referred to as a second temperature acquisition assembly, and similarly, a second temperature acquisition assembly may also be referred to as a first temperature acquisition assembly without departing from the scope of embodiments of the present invention.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element.
Aiming at the problem of low detection precision when the current is detected through the current divider in the prior art, the embodiment of the invention provides the following solution ideas: set up temperature acquisition device in detection circuitry to the temperature electromotive force of each subassembly in the shunt is acquireed based on the temperature of gathering, thereby, based on the voltage of thermoelectric force to resistance calibrates, obtains the calibration voltage of resistance, and then, according to the resistance of calibration voltage and resistance, realizes the detection to the electric current, improves and detects the precision.
Under the guidance of this idea, the present embodiment provides the following feasible embodiments.
Example one
The embodiment of the invention provides a detection circuit and method, a detector, a battery device, a transport tool and a computer readable storage medium.
Specifically, referring to fig. 2, which is a schematic structural diagram of a first embodiment of a detection circuit according to the present invention, as shown in fig. 2, the detection circuit 200 includes:
a current divider 210 including a resistor 211, a current input element 212 of the resistor 11, and a current output element 213 of the resistor 11;
the temperature acquisition device 220 is used for acquiring a first temperature of the current input component 212 and a second temperature of the current output component 213;
the voltage acquisition device 230 is used for acquiring the voltage of the resistor 211;
the processing element 240 is configured to obtain a calibration voltage of the resistor 211 according to the first temperature, the second temperature, and the voltage of the resistor 211.
In a specific implementation process, the detection circuit 200 shown in fig. 2 may be disposed in a circuit to be detected, wherein the shunt 210 is connected in series in the circuit to be detected, that is, the resistor 211 is connected in series in the circuit to be detected, so that the current flowing through the resistor 211 is the current flowing through the circuit to be detected, and thus the current detection of the circuit to be detected is achieved.
Referring to fig. 3, which is a schematic structural diagram of a second embodiment of the detection circuit according to the present invention, as shown in fig. 3, the detection circuit 200 includes:
the temperature acquisition device 220 is used for acquiring a first temperature of the current input component 212 of the resistor 211 and a second temperature of the current output component 213 of the resistor 211;
the voltage acquisition device 230 is used for acquiring the voltage of the resistor 211;
the processing element 240 is configured to obtain a calibration voltage of the resistor 211 according to the first temperature, the second temperature, and the voltage of the resistor 211.
As shown in fig. 2 or fig. 3, the temperature acquisition device 220 may be disposed as close to the shunt 210 as possible, and is in contact with the current input component 212 and the current output component 213, but not in contact with the resistor 211, so as to ensure that the temperatures acquired by the temperature acquisition device 220 are the first temperature of the current input component 212 and the second temperature of the current output component 213.
In a specific application scenario, please refer to fig. 4, which is a schematic structural diagram of a third embodiment of the detection circuit provided in the embodiment of the present invention, as shown in fig. 4, a temperature acquisition device 220 in the detection circuit 200 includes:
a first temperature collection component 221, a first end of the first temperature collection component 221 is used for collecting a first temperature of the current input component 212, and a second end of the first temperature collection component 221 is connected to the processing component 240;
a second temperature collecting component 222, a first end of the second temperature collecting component 222 is used for collecting a second temperature of the current output component 213, and a second end of the second temperature collecting component 222 is connected to the processing component 240.
As shown in fig. 4, the first temperature collecting element 221 is disposed at a position in contact with the current input element 212 and not in contact with the resistor 211, and is used for collecting a first temperature of the current input element 212; the second temperature collecting element 222 is disposed at a position where it is in contact with the current output element 213 and is not in contact with the resistor 211, and is used for collecting a second temperature of the current output element 213.
In a specific implementation process, the first temperature acquisition assembly is a thermistor; and/or the second temperature acquisition component is a thermistor.
In a specific implementation process, considering that the temperature signal acquired by the temperature acquisition assembly is an analog electrical signal, an analog-to-digital conversion assembly can be further arranged between the temperature acquisition assembly and the processing group, the analog electrical signal is converted into a digital signal through the analog-to-digital conversion assembly, and the converted electrical signal is transmitted to the processing assembly.
Therefore, in the process of implementing the scheme specifically, an analog-to-digital conversion component can be arranged in the detection circuit according to actual needs. At this time, the temperature acquisition device in the detection circuit may further include:
the first analog-to-digital conversion assembly is connected between the second end of the first temperature acquisition assembly and the processing assembly and is used for converting the analog electric signal of the first temperature into a digital signal and transmitting the digital signal to the processing assembly; and/or the presence of a gas in the gas,
and the second analog-to-digital conversion component is connected between the second end of the second temperature acquisition component and the processing component and used for converting the analog electric signal of the second temperature into a digital signal and transmitting the digital signal to the processing component.
At this time, referring to fig. 4, in the detection circuit 200 shown in fig. 4, the temperature acquisition device 220 further includes: a first analog-to-digital conversion component 223 and a second analog-to-digital conversion component 224. The first analog-to-digital conversion component 223 is connected between the second end of the first temperature acquisition component 221 and the processing component 240; the second analog-to-digital conversion assembly 224 is connected between the second end of the second temperature acquisition assembly 222 and the processing assembly 240. The function of which is as described above and will not be described in detail herein.
In a specific implementation process, the Analog-to-Digital Converter (ADC) components may be implemented by an Analog-to-Digital Converter (ADC).
In the embodiment of the present invention, as shown in fig. 2 to 4, the voltage collecting device 230 may collect the voltage of the resistor 211 by collecting the voltage of the preset sampling point (e.g., the sampling point a and the sampling point B in fig. 2 or fig. 3). Specifically, as shown in fig. 2 to 4, the sampling point a is disposed on the current input element 212 and in contact with the resistor 211, and the sampling point B is disposed on the current output element 213 and in contact with the resistor 211.
Specifically, as shown in fig. 4, the voltage collecting device 230 specifically includes:
the first end of the voltage collecting component 231 is used for collecting a first voltage at a position, in contact with the resistor 211, of the current input component 212, the second end of the voltage collecting component 231 is used for collecting a second voltage at a position, in contact with the resistor 211, of the current output component 213, and the third end of the voltage collecting component 231 is connected to the processing component 240.
In a specific implementation process, the voltage acquisition component may be implemented by an amplifier, and at this time, a first input end of the amplifier is connected to the sampling point a, a second input end of the amplifier is connected to the sampling point B, and an output end of the amplifier is connected to the processing component.
Considering that the voltage signal collected by the amplifier is an analog electrical signal, in implementing the scheme, as shown in fig. 4, the voltage collecting device 230 further includes:
the third analog-to-digital conversion component 232 is connected between the second end of the voltage acquisition component 231 and the processing component 240, and is configured to obtain a difference between the analog electrical signal of the first voltage and the analog electrical signal of the second voltage, convert the difference into a digital signal, and transmit the digital signal to the processing component 240.
Similar to the analog-to-digital conversion module in the temperature acquisition device, the third analog-to-digital conversion module in the voltage acquisition device can also be implemented by an ADC, which is not described herein again.
In particular, the processing component may be a processing chip. Based on the position of the detection circuit, the processing assembly can share the same processing chip with other electric devices for cost saving.
For example, in a possible application scenario, the detection circuit may be integrated with a relay detection circuit for detecting whether the relay is failed, and thus, the detection circuit and the relay detection circuit may be implemented by using the same processing chip.
For another example, in another possible application scenario, the processing component in the detection circuit may be implemented by a processing chip in a Battery Management System (BMS), so that the cost of additionally providing a chip for the detection circuit is saved, and the integration level of the BMS is improved.
Hereinafter, the processing procedure of the processing unit will be specifically described with reference to the specific configuration of the detection circuit.
Specifically, please refer to fig. 5, which is a flowchart illustrating a detection method according to an embodiment of the present invention, wherein the detection method shown in fig. 5 is applicable to any of the detection circuits of the above-mentioned implementations and is executed in a processing module. Specifically, as shown in fig. 5, the detection method includes:
s501, collecting a first temperature of a current input assembly and a second temperature of a current output assembly, and collecting voltage of a resistor.
It can be understood that the first temperature and the second temperature can be acquired by the temperature acquisition device, and are not described in detail; the voltage of the resistor can be acquired by the voltage acquisition device and is not repeated.
S502, obtaining the calibration voltage of the resistor according to the first temperature, the second temperature and the voltage of the resistor.
In the step S502, a thermoelectromotive force between the current input element, the resistor and the current output element may be obtained according to the first temperature and the second temperature, so that a difference between a voltage of the resistor and the thermoelectromotive force is obtained, and a calibration voltage of the resistor is obtained.
The acquisition of the thermoelectromotive force among the current input assembly, the resistor and the current output assembly can be realized by a formula of the thermoelectromotive force.
The conditions and principles of generating the thermoelectromotive force will be explained below. Please refer to fig. 6, which is a schematic diagram illustrating the principle of generating the thermoelectric force.
As shown in fig. 6, when two different metal materials a and b are in contact and at different temperatures, the thermoelectromotive force between the two metal materials is:
＝C(t2-t1)
wherein C represents the temperature difference coefficient between the metal material a and the metal material b, t2Is the temperature, t, of the metallic material b1Is the temperature of the metallic material a.
In summary, the thermoelectromotive force is related to two materials in contact with each other.
Referring to fig. 7, which is a schematic view of an installation structure of the shunt shown in fig. 1, as shown in fig. 7, the shunt 210 is fixed and connected to the first connecting copper bar 702 by a first locking bolt 701 at the left side of the shunt 210; on the right side of the shunt 210, the shunt 210 is fixed and connected to a second connecting copper bar 704 by a second locking bolt 703. As shown in fig. 1 and 7, the first locking bolt 701 in fig. 7 is disposed at the position of the first mounting hole 121 in fig. 1, and the two can be engaged with each other; the second locking bolt 703 in fig. 7 is provided at the position of the second mounting hole 131 in fig. 1, and both can be fitted.
Based on the mounting structure shown in fig. 7, a line E indicates a current, and an arrow direction of the line E indicates a current flow direction. Then, as shown in fig. 7, the sequence of current flowing through the current divider 210 is: first connecting copper bar 702 → the contact surface of the first connecting copper bar 702 with the shunt 210 → the current input element 12 in the shunt 210 → the resistance 11 of the shunt 210 → the current output end 13 of the resistance in the shunt 210 → the contact surface of the second connecting copper bar 704 with the shunt 210 → the second connecting copper bar 704.
As can be seen from the mounting structure shown in fig. 7, two thermoelectromotive forces exist in the internal structure of the shunt 210: a first thermoelectromotive force between the resistor 211 and the current input member 212, and a second thermoelectromotive force between the resistor 211 and the current output member 213.
Also, the temperature difference coefficient between two materials is fixed when the two materials in contact with each other are determined based on that the temperature difference coefficient is only related to the materials. In a specific application scenario, the following two situations exist in the thermoelectromotive force in the shunt:
first, the current input assembly is made of the same material as the current output assembly.
This implementation is conventional in the prior art for splitters.
In this implementation, the first temperature differential coefficient is equal to the second temperature differential coefficient.
Based on this, combine above-mentioned computational formula of calculating the thermoelectric force, only need gather the first temperature of current input subassembly and the second temperature of current output subassembly, can obtain the thermoelectric force between current input subassembly, resistance and the current output subassembly to, utilize thermoelectric force to calibrate the voltage of resistance, obtain the calibration voltage of resistance.
Specifically, the temperature difference between the first temperature and the second temperature can be obtained, and thus, the product of the temperature difference coefficient between the resistor and the current input assembly and the temperature difference can be obtained, and the thermoelectromotive force between the current input assembly, the resistor and the current output assembly can be obtained.
The expressions of the thermoelectromotive force among the current input assembly, the resistor and the current output assembly are as follows:
VT＝C1×(T1-T2)
wherein, VTRepresenting the thermoelectromotive force between the current input assembly, the resistor and the current output assembly, C representing the temperature difference coefficient between the resistor and the current input assembly, and T1Denotes a first temperature, T2Representing the second temperature.
It should be noted that, in the embodiment of the present invention, the temperature difference electromotive force V between the current input component, the resistor, and the current output component is obtainedTThere is no particular limitation on the flowing direction of the current, that is, in implementing the present solution, the above formula can be implemented, that is, the thermoelectromotive force V is obtained according to the difference between the first temperature of the current input component and the second temperature of the current output componentT(ii) a Alternatively, the thermoelectromotive force V can be obtained according to the difference between the second temperature of the current output assembly and the first temperature of the current input assemblyTAt this time, it can be expressed as the following equation:
VT＝C1×(T2-T1)
wherein, VTRepresenting the thermoelectromotive force between the current input assembly, the resistor and the current output assembly, C representing the temperature difference coefficient between the resistor and the current input assembly, and T1Denotes a first temperature, T2Representing the second temperature.
It should be noted that, in the embodiment of the present invention, T may exist in consideration of the difference in the respective temperatures of the two metal materials in contact with each other1＜T2In case (2), there may be T1＞T2The resulting thermoelectromotive force V between the current input means, the resistor and the current output meansTEither positive or negative values are possible.
Second, the current input assembly is made of a different material than the current output assembly.
In this implementation, the first temperature differential coefficient is not equal to the second temperature differential coefficient.
In this application scenario, a third temperature acquisition component for acquiring the resistance temperature is also required to be disposed in the detection circuit.
Specifically, referring to fig. 8, which is a schematic structural diagram of a fourth embodiment of the detection circuit provided in the embodiment of the present invention, as shown in fig. 8, the temperature acquisition device 220 of the detection circuit 200 further includes:
a third temperature collection component 225, a first end of the third temperature collection component 225 is used for collecting a third temperature of the resistor 211, and a second end of the third temperature collection component 225 is connected to the processing component 240.
As shown in fig. 8, the third temperature acquisition component 225 is disposed near the resistor 211 and does not contact the current input component 212 and the current output component 213. The third temperature acquisition component 225 may also be a thermistor.
Moreover, in a specific implementation process, as shown in fig. 8, the temperature acquisition device 220 may further include:
the fourth analog-to-digital conversion component 226 is connected between the second end of the third temperature acquisition component 225 and the processing component 240, and is configured to convert the analog electrical signal of the third temperature into a digital signal and transmit the digital signal to the processing component 240.
The fourth analog-to-digital conversion module 226 shown in fig. 8 can also be an ADC, and is not described herein again.
At this time, when the processing component executes the detection method, the method further includes:
and collecting a third temperature of the resistor.
Based on the collected third temperature, the implementation process in executing S502 may be:
obtaining a first temperature difference electromotive force between the resistor and the current input assembly according to the first temperature and the third temperature; obtaining a second temperature difference electromotive force between the resistor and the current output assembly according to the second temperature and the third temperature; therefore, the sum of the first thermoelectromotive force and the second thermoelectromotive force is obtained, and the thermoelectromotive forces among the current input assembly, the resistor and the current output assembly are obtained.
At this time, the expressions of the thermoelectromotive force between the current input assembly, the resistor and the current output assembly are as follows:
VT＝VT1+VT2＝C1×(T1-T3)+C2×(T3-T2)
wherein, VTRepresenting the thermoelectromotive force, V, between the current input element, the resistor and the current output elementT1Indicates the first temperatureDifferential electromotive force, VT2Represents a second thermoelectromotive force, C1Representing a first temperature difference coefficient, C, between the resistor and the current input member2Representing a second coefficient of temperature difference, T, between the resistor and the current output member3Representing the third temperature of the resistance.
It should be noted that, in the process of obtaining the first thermoelectromotive force and the second thermoelectromotive force through the above implementation manner, the current flowing direction needs to be kept consistent.
That is, the temperature of the current flowing end can be subtracted from the temperature of the current flowing end to obtain a first thermoelectromotive force and a second thermoelectromotive force; as shown in the above formula, it is not described in detail.
Or, the temperature of the current flowing-out end may be subtracted from the temperature of the current flowing-in end to obtain the first thermoelectromotive force and the second thermoelectromotive force, and at this time, the expressions of the thermoelectromotive forces among the current input component, the resistor and the current output component are as follows:
VT＝VT1+VT2＝C1×(T3-T1)+C2×(T2-T3)
wherein, VTRepresenting the thermoelectromotive force, V, between the current input element, the resistor and the current output elementTRepresenting a first thermoelectromotive force, VT2Represents a second thermoelectromotive force, C1Representing a first temperature difference coefficient, C, between the resistor and the current input member2Representing a second coefficient of temperature difference, T, between the resistor and the current output member3Representing the third temperature of the resistance.
It should be noted that, in the embodiments of the present invention, there is no particular limitation on the material of the current input component and the material of the current output component of the resistor in the shunt. For example, the current input assembly may be made of a single metal, or may be made of a mixture of multiple metal materials, which is not particularly limited in the embodiments of the present invention.
Based on the above steps, the thermoelectromotive force between the current input component, the resistor and the current output component is obtained, and then, based on the thermoelectromotive force obtained by each implementation mode, the difference between the voltage of the resistor and the thermoelectromotive force is obtained, so that the calibration voltage of the resistor can be obtained. The expression is as follows:
Vl＝V-VT
wherein, VlIndicating the calibration voltage of the resistor, V indicating the voltage of the resistor, VTRepresenting the thermoelectromotive force between the current input component, the resistor and the current output component.
In a specific implementation process, V is the voltage collected by the voltage collection device.
Based on this, for the two cases described above, the expression of the calibration voltage for the resistance can be found as:
when the material of the current input component is the same as that of the current output component, the calibration voltage of the resistor is as follows:
Vl＝V-VT＝V-C1×(T1-T2)
or,
Vl＝V-VT＝V-C1×(T2-T1)
when the material of the current input component is different from that of the current output component, the calibration voltage of the resistor is as follows:
Vl＝V-VT＝V-VT1-VT2＝V-C1×(T1-T3)-C2×(T3-T2)
or,
Vl＝V-VT＝V-VT1-VT2＝V-C1×(T3-T1)-C2×(T2-T3)
wherein, VlIndicating the calibration voltage of the resistor, V indicating the voltage of the resistor, VTRepresenting the thermoelectromotive force, V, between the current input element, the resistor and the current output elementT1Representing a first thermoelectromotive force, VT2Represents a second thermoelectromotive force, C1Representing a first temperature difference coefficient, C, between the resistor and the current input member2Representing a second coefficient of temperature difference, T, between the resistor and the current output member3Third temperature, T, representing resistance1Denotes a first temperature, T2Representing the second temperature.
The detection circuit 200 of any one of the embodiments shown in fig. 2 to 4 and 8 may be used for voltage detection or current detection.
When the detection circuit is used to detect the voltage across the shunt 210, the processing element 240 is only used to obtain the calibration voltage of the resistor 211 according to the first temperature, the second temperature and the voltage of the resistor 211.
Alternatively, when the detection circuit is used to detect the current flowing through the shunt 210, the processing component 240 is used to obtain the value of the current flowing through the resistor 211 according to the calibration voltage of the resistor 211 and the resistance value of the resistor 211, in addition to the calibration voltage of the resistor 211.
In a specific implementation process, the quotient of the calibration voltage of the resistor and the resistance value of the resistor is obtained, and then the value of the current flowing through the resistor can be obtained. At this time, an expression of the current flowing through the resistor is obtained as follows:
I＝Vl/R
wherein I represents the current flowing through the resistor, VlThe calibration voltage of the resistor is represented and R represents the resistance of the resistor.
Based on the foregoing detection method, an embodiment of the present invention further provides a computer-readable storage medium, including: computer-executable instructions for performing the detection method of any of the above-described implementations when the computer-executable instructions are executed.
The embodiment of the invention also provides the circuit board. Referring to fig. 9, which is a schematic structural diagram of a circuit board according to an embodiment of the present invention, as shown in fig. 9, the circuit board 900 includes: the detection circuit 200 obtained by any of the above-mentioned implementation manners.
The embodiment of the invention also provides a detector. Referring to fig. 10, which is a schematic structural diagram of a detector according to an embodiment of the present invention, as shown in fig. 10, the detector 1000 includes: the detection circuit 200 obtained by any of the above-mentioned implementation manners.
The embodiment of the invention also provides a battery system. Referring to fig. 11, which is a schematic structural diagram of a battery system according to an embodiment of the present invention, as shown in fig. 11, the battery system 1100 includes:
a battery 100;
in the detection circuit 200 according to any of the above embodiments, the detection circuit 200 is provided between the positive electrode (HV +) and the negative electrode (HV-) of the battery 100 (see fig. 11).
At this time, the embodiment of the present invention does not limit other electric devices included in the battery system, and is represented by … … in fig. 11.
The embodiment of the invention also provides a transport tool. Referring to fig. 12, which is a schematic structural diagram of a transportation vehicle according to an embodiment of the present invention, as shown in fig. 12, the transportation vehicle 1200 includes: the detection circuit 200 obtained by any of the above-mentioned implementation manners.
The technical scheme of the embodiment of the invention has the following beneficial effects:
in the embodiment of the invention, the temperature acquisition device in the detection circuit acquires the first temperature of the current input component of the resistor and the second temperature of the current output component of the resistor, so that the temperature difference electromotive force between different materials on the current divider can be acquired based on the first temperature and the second temperature, the voltage of the resistor is calibrated based on the acquired temperature difference electromotive force, and the calibration voltage is acquired; based on this, the detection of the voltage is achieved by the detection method. Therefore, when the scheme is applied to the current divider, the technical scheme provided by the embodiment of the invention can realize the influence on the current detection based on the obtained calibration voltage, and improve the detection precision.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (12)

1. A detection circuit, comprising:
the current divider comprises a resistor, a current input component of the resistor and a current output component of the resistor;
the temperature acquisition device is used for acquiring a first temperature of the current input assembly and a second temperature of the current output assembly;
the voltage acquisition device is used for acquiring the voltage of the resistor;
the processing component is used for obtaining the calibration voltage of the resistor according to the first temperature, the second temperature and the voltage of the resistor;
the temperature acquisition device includes:
the first temperature acquisition assembly is arranged at a position which is in contact with the current input assembly but not in contact with the resistor, the first end of the first temperature acquisition assembly is used for acquiring the first temperature of the current input assembly, and the second end of the first temperature acquisition assembly is connected to the processing assembly;
the first temperature acquisition assembly is arranged at a position which is in contact with the current output assembly but not in contact with the resistor, the first end of the second temperature acquisition assembly is used for acquiring the second temperature of the current output assembly, and the second end of the second temperature acquisition assembly is connected to the processing assembly;
when the material of the current input assembly is the same as the material of the current output assembly, the processing assembly is specifically configured to: acquiring a temperature difference between the first temperature and the second temperature; acquiring the product of the temperature difference coefficient and the temperature difference between the resistor and the current input assembly to obtain the temperature difference electromotive force between the current input assembly, the resistor and the current output assembly; obtaining the calibration voltage of the resistor according to the temperature difference electromotive force and the voltage of the resistor;
when the material of the current input component is different from the material of the current output component, the temperature acquisition device further comprises: a first end of the third temperature acquisition assembly is used for acquiring a third temperature of the resistor, and a second end of the third temperature acquisition assembly is connected to the processing assembly; the processing component is specifically configured to: obtaining a first thermoelectromotive force between the resistor and the current input component according to the product of the temperature difference between the first temperature and the third temperature and a first temperature difference coefficient between the resistor and the current input component; obtaining a second thermoelectromotive force between the resistor and the current output component according to the product of the temperature difference between the second temperature and the third temperature and a second temperature difference coefficient between the resistor and the current output component; acquiring the sum of the first temperature difference electromotive force and the second temperature difference electromotive force to obtain the temperature difference electromotive force among the current input assembly, the resistor and the current output assembly; and obtaining the calibration voltage of the resistor according to the temperature difference electromotive force and the voltage of the resistor.
2. A detection circuit, comprising:
the temperature acquisition device is used for acquiring a first temperature of a current input assembly of the resistor and a second temperature of a current output assembly of the resistor;
the voltage acquisition device is used for acquiring the voltage of the resistor;
the processing component is used for obtaining the calibration voltage of the resistor according to the first temperature, the second temperature and the voltage of the resistor;
the temperature acquisition device includes:
the first temperature acquisition assembly is arranged at a position which is in contact with the current input assembly but not in contact with the resistor, the first end of the first temperature acquisition assembly is used for acquiring the first temperature of the current input assembly, and the second end of the first temperature acquisition assembly is connected to the processing assembly;
the first temperature acquisition assembly is arranged at a position which is in contact with the current output assembly but not in contact with the resistor, the first end of the second temperature acquisition assembly is used for acquiring the second temperature of the current output assembly, and the second end of the second temperature acquisition assembly is connected to the processing assembly;
when the material of the current input assembly is the same as the material of the current output assembly, the processing assembly is specifically configured to: acquiring a temperature difference between the first temperature and the second temperature; acquiring the product of the temperature difference coefficient and the temperature difference between the resistor and the current input assembly to obtain the temperature difference electromotive force between the current input assembly, the resistor and the current output assembly; obtaining the calibration voltage of the resistor according to the temperature difference electromotive force and the voltage of the resistor;
when the material of the current input component is different from the material of the current output component, the temperature acquisition device further comprises: a first end of the third temperature acquisition assembly is used for acquiring a third temperature of the resistor, and a second end of the third temperature acquisition assembly is connected to the processing assembly; the processing component is specifically configured to: obtaining a first thermoelectromotive force between the resistor and the current input component according to the product of the temperature difference between the first temperature and the third temperature and a first temperature difference coefficient between the resistor and the current input component; obtaining a second thermoelectromotive force between the resistor and the current output component according to the product of the temperature difference between the second temperature and the third temperature and a second temperature difference coefficient between the resistor and the current output component; acquiring the sum of the first temperature difference electromotive force and the second temperature difference electromotive force to obtain the temperature difference electromotive force among the current input assembly, the resistor and the current output assembly; and obtaining the calibration voltage of the resistor according to the temperature difference electromotive force and the voltage of the resistor.
3. The detection circuit of claim 2, wherein the temperature acquisition device further comprises:
the first analog-to-digital conversion assembly is connected between the second end of the first temperature acquisition assembly and the processing assembly and is used for converting the analog electric signal of the first temperature into a digital signal and transmitting the digital signal to the processing assembly; and/or the presence of a gas in the gas,
and the second analog-to-digital conversion component is connected between the second end of the second temperature acquisition component and the processing component and is used for converting the analog electric signal of the second temperature into a digital signal and transmitting the digital signal to the processing component.
4. The detection circuit of claim 2, wherein the voltage acquisition device comprises:
the voltage acquisition assembly, the first end of voltage acquisition assembly be used for gathering on the current input assembly with the first voltage of resistance contact position, the second end of voltage acquisition assembly be used for gathering on the current output assembly with the second voltage of resistance contact position, the third end of voltage acquisition assembly is connected to processing component.
5. The detection circuit of claim 4, wherein the voltage acquisition device further comprises:
and the third analog-to-digital conversion component is connected between the second end of the voltage acquisition component and the processing component and is used for acquiring a difference value between the analog electric signal of the first voltage and the analog electric signal of the second voltage, converting the difference value into a digital signal and transmitting the digital signal to the processing component.
6. The detection circuit of claim 2, wherein the temperature acquisition device further comprises:
and the fourth analog-to-digital conversion component is connected between the second end of the third temperature acquisition component and the processing component and is used for converting the analog electric signal of the third temperature into a digital signal and transmitting the digital signal to the processing component.
7. A detector, comprising: the detection circuit of any one of claims 1 to 6.
8. A battery device, comprising:
a battery;
the detection circuit of any one of claims 1 to 6, disposed between a positive and a negative pole of the battery.
9. A vehicle, comprising: the detection circuit of any one of claims 1 to 6.
10. A detection method applied to the detection circuit according to claim 1 or 2, executed in the processing component, comprising:
collecting a first temperature of the current input assembly using the first temperature collecting assembly disposed at a position in contact with the current input assembly without being in contact with the resistor, collecting a second temperature of the current output assembly using the second temperature collecting assembly disposed at a position in contact with the current output assembly without being in contact with the resistor, and collecting a voltage of the resistor;
obtaining a calibration voltage of the resistor according to the first temperature, the second temperature and the voltage of the resistor; when the material of the current input component is the same as the material of the current output component, obtaining the calibration voltage of the resistor according to the first temperature, the second temperature and the voltage of the resistor, including:
acquiring a temperature difference between the first temperature and the second temperature;
acquiring the product of the temperature difference coefficient and the temperature difference between the resistor and the current input assembly to obtain the temperature difference electromotive force between the current input assembly, the resistor and the current output assembly;
obtaining the calibration voltage of the resistor according to the temperature difference electromotive force and the voltage of the resistor;
when the material of the current input component is different from the material of the current output component, the method further comprises: collecting a third temperature of the resistor; the obtaining a calibration voltage of the resistor according to the first temperature, the second temperature and the voltage of the resistor includes:
obtaining a first thermoelectromotive force between the resistor and the current input component according to the product of the temperature difference between the first temperature and the third temperature and a first temperature difference coefficient between the resistor and the current input component;
obtaining a second thermoelectromotive force between the resistor and the current output component according to the product of the temperature difference between the second temperature and the third temperature and a second temperature difference coefficient between the resistor and the current output component;
acquiring the sum of the first temperature difference electromotive force and the second temperature difference electromotive force to obtain the temperature difference electromotive force among the current input assembly, the resistor and the current output assembly;
and acquiring the difference between the voltage of the resistor and the thermoelectromotive force to obtain the calibration voltage of the resistor.
11. The detection method according to claim 10, further comprising:
and obtaining the quotient of the calibration voltage of the resistor and the resistance value of the resistor to obtain the current flowing through the resistor.
12. A computer-readable storage medium, comprising: computer-executable instructions for performing the detection method according to claim 10 or 11 when said computer-executable instructions are executed.
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Patentee after: Ningde Shidai Runzhi Software Technology Co.,Ltd.

Address before: 352100 Xingang Road, Zhangwan Town, Jiaocheng District, Ningde, Fujian 1

Patentee before: Contemporary Amperex Technology Co.,Ltd.