CN116466130A - Control method for eliminating thermoelectric potential of shunt, electric equipment and energy storage equipment - Google Patents
Control method for eliminating thermoelectric potential of shunt, electric equipment and energy storage equipment Download PDFInfo
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- CN116466130A CN116466130A CN202310358206.0A CN202310358206A CN116466130A CN 116466130 A CN116466130 A CN 116466130A CN 202310358206 A CN202310358206 A CN 202310358206A CN 116466130 A CN116466130 A CN 116466130A
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- 238000009434 installation Methods 0.000 claims description 27
- 230000001276 controlling effect Effects 0.000 description 31
- 239000004065 semiconductor Substances 0.000 description 13
- 238000005057 refrigeration Methods 0.000 description 12
- 238000001816 cooling Methods 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
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- 229910000881 Cu alloy Inorganic materials 0.000 description 2
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/32—Compensating for temperature change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
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Abstract
The invention discloses a control method for eliminating a diverter thermal potential, a diverter, electric equipment and energy storage equipment, wherein the diverter comprises a diverter main body, a first connecting part and a second connecting part which are connected with two ends of the diverter main body, and a temperature control assembly arranged on the first connecting part and the second connecting part, and the control method for eliminating the diverter thermal potential comprises the following steps: acquiring a temperature value of the first connecting part and the second connecting part; when the temperature difference between the first connecting part and the second connecting part is larger than the preset temperature difference, the temperature control assembly is controlled to adjust the temperature of the first connecting part and/or the temperature of the second connecting part, so that the temperature difference between the first connecting part and the second connecting part is smaller than the preset temperature difference. The invention can solve the problem that the detection precision of the current divider in the use process can not meet the high-precision requirement.
Description
Technical Field
The invention relates to the technical field of shunts, in particular to a control method for eliminating the thermoelectric potential of a shunt, the shunt, electric equipment and energy storage equipment.
Background
The shunt is an instrument for measuring direct current and is manufactured according to the principle that voltage is generated at two ends of a resistor when direct current passes through the resistor. In the electronic metering technology industry, the direct current shunt can be used for sampling and detecting current limiting, backflow and current sharing of a power supply of a battery management system, an electronic complete machine, a communication system and an automatic control system.
However, with the rapid development of some industries, the requirements on the detection precision of the current divider are also increasing, for example, in a BMS (Battery Management System ) in a new energy automobile, the current detection requirement on the current divider is higher, but the current divider in the market still can not meet the problem of high precision requirement due to various problems in the use process of the current divider.
Disclosure of Invention
The invention mainly aims to provide a control method for eliminating the thermoelectric potential of a shunt, and aims to solve the problem that the detection precision of the shunt in the use process cannot meet the high-precision requirement.
In order to achieve the above object, the present invention provides a method for controlling a thermal potential of a current divider, the current divider including a current divider body, a first connecting portion and a second connecting portion connected to two ends of the current divider body, and a temperature control assembly disposed on the first connecting portion and the second connecting portion, the method for controlling a thermal potential of a current divider includes:
Acquiring a temperature value of the first connecting part and the second connecting part;
when the temperature difference between the first connecting part and the second connecting part is larger than the preset temperature difference, the temperature control assembly is controlled to adjust the temperature of the first connecting part and/or the temperature of the second connecting part, so that the temperature difference between the first connecting part and the second connecting part is smaller than the preset temperature difference.
Optionally, the step of controlling the temperature control component to adjust the temperature of the first connection portion and/or the second connection portion specifically includes:
controlling the temperature control assembly to adjust the temperature of one connecting part to be equal to the temperature of the other connecting part; or alternatively, the process may be performed,
and determining an average temperature value according to the temperature values of the first connecting part and the second connecting part, and controlling the temperature control assembly to adjust the temperatures of the first connecting part and the second connecting part to the average temperature value.
Optionally, before the step of controlling the temperature control assembly to adjust the temperature of the first connection portion and/or the second connection portion, the step of controlling the temperature control assembly further includes:
acquiring a preset temperature value of the shunt;
the step of controlling the temperature control assembly to adjust the temperature of the first connection portion and/or the second connection portion specifically includes:
And controlling the temperature control assembly to adjust the temperature of the first connecting part and/or the second connecting part according to the temperature values of the first connecting part and the second connecting part and the preset temperature value.
Optionally, the step of controlling the temperature control component to adjust the temperature of the first connection portion and/or the second connection portion according to the temperature values of the first connection portion and the second connection portion and the preset temperature value specifically includes:
and comparing the temperature value of the first connecting part and the temperature value of the second connecting part with preset temperature values respectively, obtaining comparison results, and controlling the temperature control assembly to adjust the temperature of the first connecting part and/or the temperature of the second connecting part according to the comparison results.
Optionally, the step of controlling the temperature control assembly to adjust the temperature of the first connection portion and/or the second connection portion according to the comparison result specifically includes:
when the temperature values of the first connecting part and the second connecting part are larger than the preset temperature value, controlling the temperature control assembly to adjust the temperatures of the first connecting part and the second connecting part to the preset temperature value;
when the temperature value of one connecting part of the shunt is larger than a preset temperature value and the temperature value of the other connecting part is smaller than the preset temperature value, controlling the temperature control assembly to adjust the temperature of the connecting part with the temperature value larger than the preset temperature value to be equal to the temperature of the other connecting part;
When the temperature values of the first connecting part and the second connecting part are smaller than the preset temperature value, the temperature control assembly is controlled to adjust the temperature of one connecting part to be equal to the temperature of the other connecting part, or an average temperature value is determined according to the temperature values of the first connecting part and the second connecting part, and the temperature control assembly is controlled to adjust the temperature of the first connecting part and the temperature of the second connecting part to the average temperature value.
Optionally, the first connection part has a first mounting end for connection with an electrical load, and the second connection part has a second mounting end for connection with a power supply;
the step of obtaining the temperature value of the first connecting part and the second connecting part specifically comprises the following steps:
acquiring a temperature value of the first installation end and the second installation end;
the step of adjusting the temperature of the first connecting part and/or the second connecting part according to the temperature values of the first connecting part and the second connecting part so that the temperature difference between the first connecting part and the second connecting part is smaller than a preset temperature difference value specifically comprises the following steps:
according to the temperature values of the first mounting end and the second mounting end, the temperature of the first mounting end and/or the second mounting end is/are adjusted so that the temperature difference between the first mounting end and the second mounting end is smaller than a preset temperature difference.
The invention also proposes a shunt comprising:
a diverter body;
a first connecting part and a second connecting part which are electrically connected with two ends of the diverter main body;
the temperature control assembly is arranged on the first connecting part and the second connecting part and is used for adjusting the temperature of the first connecting part and the second connecting part;
and the control end of the controller is connected with the controlled end of the temperature control assembly, a thermoelectric force control program is stored in the controller, and the thermoelectric force control program realizes the method for eliminating the shunt thermoelectric force when being executed by the controller.
Optionally, the shunt further comprises:
the first temperature sensor is arranged on the first connecting part, the output end of the first temperature sensor is connected with the receiving end of the controller, and the first temperature sensor is used for detecting the temperature of the first connecting part and outputting a corresponding temperature detection signal;
the second temperature sensor is arranged on the second connecting part, the output end of the second temperature sensor is connected with the receiving end of the controller, and the second temperature sensor is used for detecting the temperature of the second connecting part and outputting a corresponding temperature detection signal.
Optionally, the first connection part has a first mounting end, and the second connection part has a second mounting end;
the temperature control assembly is arranged on the first mounting end and the second mounting end;
the first temperature sensor and the second temperature sensor are respectively arranged on the first mounting end and the second mounting end.
The invention also provides electric equipment which comprises the shunt.
The invention further provides energy storage equipment, and the automobile comprises the shunt.
According to the technical scheme, whether the current divider generates thermoelectric force is judged by acquiring the temperature values of the first connecting part and the second connecting part and according to the temperature difference value of the first connecting part and the second connecting part, when the current divider generates thermoelectric force, namely, the temperature difference value of the first connecting part and the second connecting part is larger than a preset temperature difference value, the temperature control assembly is controlled to adjust the temperature of the first connecting part and/or the second connecting part so as to eliminate the temperature difference between the first connecting part and the second connecting part, so that the thermoelectric force generated by the current divider is eliminated, the current divider can keep high detection precision, and the detection precision of the current divider is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of an embodiment of a method for controlling a thermal potential of a shunt according to the present invention;
FIG. 2 is a schematic diagram of a refinement flow chart of an embodiment of a method for controlling a thermal potential of a shunt according to the present invention;
FIG. 3 is a schematic diagram of a refinement flow chart of another embodiment of a method for controlling a splitter thermoelectric voltage according to the present invention;
FIG. 4 is a schematic view of an embodiment of a shunt according to the present invention;
FIG. 5 is a schematic view of another embodiment of the shunt of the present invention.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
At present, with the rapid development of some industries, the requirements on the detection precision of the current divider are also gradually improved, for example, in a BMS (Battery Management System ) in a new energy automobile, the current detection requirement on the current divider is higher, but the current divider on the market still can not meet the problem of high precision requirement due to the existence of various problems in the using process of the current divider.
It will be appreciated that in the use process, the accuracy of the detection of the shunt is generally reduced due to factors such as device structure, component materials or temperature, for example, the difference in heat received by the first and second connection portions may exist due to different objects connected to the first and second connection portions at two ends of the shunt, which means that there may be a temperature difference between the first and second connection portions of the shunt, thereby causing the shunt to generate thermoelectric voltage and further affecting the accuracy of the detection of the shunt.
In order to solve the above-mentioned problems, the present invention provides a method for controlling a thermal potential of a current divider, the current divider includes a current divider body 10, a first connecting portion 20 and a second connecting portion 30 connected to two ends of the current divider body 10, and a temperature control assembly 40 disposed on the first connecting portion 20 and the second connecting portion 30, referring to fig. 1, in an embodiment, the method for controlling a thermal potential of a current divider includes:
step S100, obtaining a temperature value of the first connecting part 20 and the second connecting part 30;
in step S200, when the temperature difference between the first connection portion 20 and the second connection portion 30 is greater than the preset temperature difference, the temperature control assembly 40 is controlled to adjust the temperature of the first connection portion 20 and/or the second connection portion 30, so that the temperature difference between the first connection portion 20 and the second connection portion 30 is less than the preset temperature difference.
In this embodiment, a processor, such as an MCU, a DSP (Digital Signal Process, a digital signal processing chip), an FPGA (Field Programmable Gate Array, a programmable gate array chip) or the like, for controlling the temperature control assembly 40 may be provided, for controlling the temperature control assembly 40 to adjust the temperatures of the first connection portion 20 and the second connection portion 30, and for acquiring the temperature values of the first connection portion 20 and the second connection portion 30. The first connecting portion 20 and the second connecting portion 30 of the current divider are provided with a temperature control assembly 40, and the temperature control assembly 40 may be a temperature control assembly 40 such as a semiconductor refrigeration device or a liquid cooling assembly.
When the current divider works, the temperature values of the first connecting part 20 and the second connecting part 30 of the current divider are obtained in real time, the temperature value of the first connecting part 20 and the temperature value of the second connecting part 30 are differed, when the temperature difference between the first connecting part 20 and the second connecting part 30 is larger than the preset temperature difference, the temperature control assembly 40 is controlled to work, the temperature values of the first connecting part 20 and the second connecting part 30 are regulated, and the temperature difference between the first connecting part 20 and the second connecting part 30 is smaller than the preset temperature difference. The preset temperature difference value can be set according to actual requirements, can be zero, can be a value approaching zero, and can be a section approaching zero, so that the temperature difference between the first connecting portion 20 and the second connecting portion 30 is kept at a value approaching zero, and the thermoelectric potential generated by the current divider due to the temperature difference between the first connecting portion 20 and the second connecting portion 30 is eliminated, so that the current divider can keep high detection precision. Specifically, when the temperature of the first connection portion 20 and the second connection portion 30 is adjusted, only the temperature value of one of the connection portions may be adjusted so that the temperatures of the first connection portion 20 and the second connection portion 30 are similar or equal, or the temperature values of the first connection portion 20 and the second connection portion 30 may be adjusted at the same time so that the temperature values of the two connection portions are similar or equal.
In the technical scheme of the invention, by acquiring the temperature values of the first connecting part 20 and the second connecting part 30 and judging whether the current divider generates thermoelectric force according to the temperature difference between the first connecting part 20 and the second connecting part 30, when the current divider generates thermoelectric force, that is, the temperature difference between the first connecting part 20 and the second connecting part 30 is greater than the preset temperature difference, the temperature control assembly 40 is controlled to adjust the temperature of the first connecting part 20 and/or the second connecting part 30 so as to eliminate the temperature difference between the first connecting part 20 and the second connecting part 30, thereby eliminating the thermoelectric force generated by the current divider, enabling the current divider to maintain high detection precision and improving the detection precision of the current divider. In addition, in the shunt, the temperature of the shunt body 10 also affects the detection accuracy, and the volumes of the first connection portion 20 and the second connection portion 30 are larger than the volume of the shunt body 10, so that the difficulty in temperature adjustment of the first connection portion 20 and the second connection portion 30 is smaller than that of the shunt body 10, and therefore, when the temperature adjustment of the first connection portion 20 and the second connection portion 30 is performed, not only the thermal potential generated by the shunt can be eliminated, but also the temperature of the shunt body 10 can be reduced through heat transfer, thereby further improving the detection accuracy of the shunt.
In an embodiment, the step of controlling the temperature control component 40 to adjust the temperature of the first connection portion 20 and/or the second connection portion 30 specifically includes:
controlling the temperature control assembly 40 to adjust the temperature of one of the connection parts to be equal to the temperature of the other connection part; or alternatively, the process may be performed,
according to the temperature values of the first connection portion 20 and the second connection portion 30, an average temperature value is determined, and the temperature control assembly 40 is controlled to adjust the temperatures of the first connection portion 20 and the second connection portion 30 to the average temperature value.
Specifically, in an embodiment, when the temperature difference between the first connection portion 20 and the second connection portion 30 is detected to be greater than the preset temperature difference, the temperature of one connection portion may be directly adjusted to be equal to or similar to the temperature of the other connection portion, for example, when the temperature of the first connection portion 20 is 30 ℃ and the temperature of the second connection portion 30 is 20 ℃, the temperature of the first connection portion 20 may be directly adjusted to 20 ℃ or the temperature of the second connection portion 30 may be adjusted to 30 ℃, so that the temperature difference between the first connection portion 20 and the second connection portion 30 approaches zero. Alternatively, the average temperature values of the first connecting portion 20 and the second connecting portion 30 may be calculated according to the temperature values of the first connecting portion 20 and the second connecting portion 30, so that the temperature values of the first connecting portion 20 and the second connecting portion 30 are adjusted at the same time, and the temperature values of the first connecting portion 20 and the second connecting portion 30 are equal to or approach the average temperature value. By the arrangement, the temperature difference between the first connecting part 20 and the second connecting part 30 can be eliminated rapidly, so that the thermoelectric potential of the shunt can be eliminated at the fastest speed, the high detection precision of the shunt can be maintained, and the detection precision of the shunt is improved.
Referring to fig. 2, in an embodiment, the step of controlling the temperature control assembly 40 to adjust the temperature of the first connection portion 20 and/or the second connection portion 30 further includes:
step S210, acquiring a preset temperature value of the shunt;
the step of controlling the temperature control assembly 40 to adjust the temperature of the first connection portion 20 and/or the second connection portion 30 specifically includes:
step S220, controlling the temperature control assembly 40 to adjust the temperature of the first connection portion 20 and/or the second connection portion 30 according to the temperature values of the first connection portion 20 and the second connection portion 30 and the preset temperature value.
It will be appreciated that the device generally has an optimum operating temperature range, and particularly for such devices as shunts, maintaining the shunt within an optimum operating temperature range can effectively improve the accuracy of the shunt detection. Therefore, in an embodiment, when the temperature difference between the first connection portion 20 and the second connection portion 30 is detected to be greater than the preset temperature difference, the preset temperature value of the shunt is obtained first, and the preset temperature value, that is, the boundary value of the operating temperature range of the optimum shunt, for example, the suitable operating temperature range of a shunt is 0-20 ℃, and the preset temperature value may be set to 20 ℃. After the preset temperature value of the current divider is obtained, the temperature control assembly 40 adjusts the temperature of the first connecting portion 20 and/or the second connecting portion 30 according to the temperature values of the first connecting portion 20 and the second connecting portion 30 and the preset temperature value, so as to eliminate the temperature difference between the first connecting portion 20 and the second connecting portion 30.
In an embodiment, the step of controlling the temperature control assembly 40 to adjust the temperature of the first connection portion 20 and/or the second connection portion 30 according to the temperature values of the first connection portion 20 and the second connection portion 30 and the preset temperature value specifically includes:
in step S230, the temperature value of the first connection portion 20 and the temperature value of the second connection portion 30 are respectively compared with a preset temperature value, a comparison result is obtained, and the temperature control assembly 40 is controlled to adjust the temperature of the first connection portion 20 and/or the second connection portion 30 according to the comparison result.
Specifically, the step of controlling the temperature control assembly 40 to adjust the temperature of the first connection portion 20 and/or the second connection portion 30 according to the comparison result specifically includes:
step S240, when the temperature values of the first connection portion 20 and the second connection portion 30 are both greater than a preset temperature value, controlling the temperature control assembly 40 to adjust the temperatures of the first connection portion 20 and the second connection portion 30 to the preset temperature value;
when the temperature value of one connecting part of the shunt is larger than the preset temperature value and the temperature value of the other connecting part is smaller than the preset temperature value, controlling the temperature control assembly 40 to adjust the temperature of the connecting part with the temperature value larger than the preset temperature value to be equal to the temperature of the other connecting part;
When the temperature values of the first connection portion 20 and the second connection portion 30 are smaller than the preset temperature value, the temperature control assembly 40 is controlled to adjust the temperature of one connection portion to be equal to the temperature of the other connection portion, or an average temperature value is determined according to the temperature values of the first connection portion 20 and the second connection portion 30, and the temperature control assembly 40 is controlled to adjust the temperature of the first connection portion 20 and the second connection portion 30 to the average temperature value.
In this embodiment, after the preset temperature value of the shunt is obtained, the preset temperature value is compared with the temperature values of the first connection portion 20 and the second connection portion 30, and when the temperature value of the first connection portion 20 and the temperature value of the second connection portion 30 are both greater than the preset temperature value, the temperature values of the first connection portion 20 and the second connection portion 30 are not considered to be in a temperature range suitable for operation at this time, so the temperature control component 40 is controlled to directly adjust the temperature values of the first connection portion 20 and the second connection portion 30 to the preset temperature value, so that not only the temperature difference between the first connection portion 20 and the second connection portion 30 is eliminated, but also the temperature values of the first connection portion 20 and the second connection portion 30 are controlled to be in the temperature range suitable for operation, thereby improving the detection accuracy of the shunt during operation. When the temperature value of one connecting part of the shunt is larger than the preset temperature value and the temperature value of the other connecting part is smaller than the preset temperature value, the temperature of the connecting part on one side with the larger temperature value can be directly regulated to be equal to the temperature of the other connecting part, namely, the temperature of the connecting part with the temperature value larger than the preset temperature value is regulated to be smaller than the temperature value of the preset temperature value, and the regulation mode also eliminates the temperature difference between the first connecting part 20 and the second connecting part 30, and can control the temperature value of the first connecting part 20 and the second connecting part 30 in a temperature range suitable for working, so that the detection precision of the shunt in working is improved. In addition, when the temperature value of the first connecting portion 20 and the temperature value of the second connecting portion 30 are both smaller than the preset temperature value, the temperature values of the first connecting portion 20 and the second connecting portion 30 are both within a suitable range, but a temperature difference exists between the first connecting portion 20 and the second connecting portion 30 at this time, so, according to the previous embodiment, the temperature of one connecting portion can be directly adjusted to be equal to or similar to the temperature of the other connecting portion, or the average temperature values of the two connecting portions can be calculated according to the temperature values of the first connecting portion 20 and the second connecting portion 30, so that the temperature values of the first connecting portion 20 and the second connecting portion 30 are both equal to or close to the average temperature value, thereby improving the detection accuracy of the diverter during operation. In addition, if the temperature values of the first connection portion 20 and the second connection portion 30 are both higher, the temperature values of the first connection portion 20 and the second connection portion 30 may be adjusted to the average temperature values of the first connection portion 20 and the second connection portion 30, that is, the temperature difference between the first connection portion 20 and the second connection portion 30 is eliminated, and then the temperature values of the first connection portion 20 and the second connection portion 30 are simultaneously adjusted to be within a temperature range suitable for operation. By adjusting the temperature, the thermoelectric effect caused by the temperature difference can be eliminated, and then the temperature values of the first connecting part 20 and the second connecting part 30 are controlled within a temperature range suitable for working, so that the high detection precision of the shunt in use can be effectively ensured.
In the technical scheme of the invention, the preset temperature value suitable for the operation of the current divider is set, and the temperatures of the first connecting part 20 and the second connecting part 30 are regulated to be equal to or lower than the preset temperature value when the temperatures of the first connecting part 20 and the second connecting part 30 are controlled, so that the current divider can operate in a temperature range suitable for the operation, and the high detection precision of the current divider during use can be effectively ensured.
In one embodiment, the first connecting portion 20 has a first mounting end for connecting to an electrical load, and the second connecting portion 30 has a second mounting end for connecting to a power source;
the step of obtaining the temperature values of the first connection portion 20 and the second connection portion 30 specifically includes:
acquiring a temperature value of the first installation end and the second installation end;
the step of adjusting the temperature of the first connecting portion 20 and/or the second connecting portion 30 according to the temperature values of the first connecting portion 20 and the second connecting portion 30 so that the temperature difference between the first connecting portion 20 and the second connecting portion 30 is smaller than the preset temperature difference specifically includes:
according to the temperature values of the first mounting end and the second mounting end, the temperature of the first mounting end and/or the second mounting end is/are adjusted so that the temperature difference between the first mounting end and the second mounting end is smaller than a preset temperature difference.
It can be understood that, since the connection portions at two sides of the shunt are respectively connected with different devices or apparatuses, the temperature change at the connection portions of the first connection portion 20 and the second connection portion 30 and the connection devices or apparatuses, that is, the first installation end and the second installation end, is relatively obvious, that is, the temperature difference between the first installation end and the second installation end is the largest, so that the temperature values of the first installation end and the second installation end can be detected, and the temperature values of the first installation end and the second installation end can be adjusted according to the temperature difference between the first installation end and the second installation end, so that the temperature difference between the first installation end and the second installation end is smaller than the preset temperature difference, and the detection accuracy of the shunt during operation is improved.
In the above embodiment, the specific scheme of the temperature control assembly 40 may be to set a semiconductor refrigeration sheet for each of the first connection portion 20 and the second connection portion 30 to realize temperature control, where the semiconductor device has a refrigeration end and a heating end, and the refrigeration end and the heating end may be changed according to different current directions loaded on both ends thereof to realize refrigeration or heating of the first connection portion 20 and the second connection portion 30. In a specific embodiment, the semiconductor refrigeration piece can be attached to the first connecting portion 20 and the second connecting portion 30 by using heat-conducting silicone grease, and is clamped to the first connecting portion 20 and the second connecting portion 30 by using an external mechanical plastic piece, so that the semiconductor refrigeration piece is attached to the first connecting portion 20 and the second connecting portion 30, and the semiconductor refrigeration piece is prevented from damaging the structure of the current divider when being mounted, thereby avoiding influencing the detection precision of the current divider. In addition, the temperature control assembly 40 may conduct heat through a physical structure and dissipate heat, for example, a liquid cooling assembly or an air cooling assembly is adopted, so that the physical structure conducts heat and dissipates heat, and when the temperature control assembly 40 is installed, the influence on the structures of the first connecting portion 20 and the second connecting portion 30 due to installation can be avoided, thereby avoiding the influence on the detection precision of the diverter.
It should be noted that in the above embodiment, the temperature adjustment is performed when the temperature difference between the first connection portion 20 and the second connection portion 30 is detected to be greater than the preset temperature difference, in addition, in an embodiment, the temperature of the first connection portion 20 and the second connection portion 30 in the future can be estimated through the temperature change condition of the first connection portion 20 and the second connection portion 30 in a certain time, so as to estimate the temperature difference change condition in the future, and the temperature of the first connection portion 20 and the second connection portion 30 can be adjusted in advance according to the estimated temperature difference change condition and the preset temperature difference, so as to avoid that the temperature difference between the first connection portion 20 and the second connection portion 30 reaches the preset temperature difference, that is, the detection precision of the shunt is prevented from being affected by the thermoelectric potential. For example, the preset temperature difference is 5 ℃, the temperature difference between the first connection portion 20 and the second connection portion 30 is 0 ℃, the temperature of the first connection portion 20 and the second connection portion 30 is detected to rise by 3 ℃ within the first 5 minutes, the temperature of the first connection portion 20 and the second connection portion 30 is detected to rise by 3 ℃ within the second 5 minutes, the temperature of the second connection portion 30 is detected to rise by 2 ℃ within the first 5 minutes, and the temperature difference between the first connection portion 20 and the second connection portion 30 is estimated to reach the preset temperature difference after 15 minutes, so that the temperature of the first connection portion 20 and the second connection portion 30 can be adjusted before the preset temperature difference is reached, for example, after 10 minutes, or can be adjusted when the estimation is completed, so that the temperature difference between the first connection portion 20 and the second connection portion 30 reaches the preset temperature difference, that is, the thermal potential of the diverter is avoided from affecting the detection accuracy of the diverter is avoided.
It can be understood that, according to the specific devices or apparatuses connected to the first connection portion 20 and the second connection portion 30, the temperature change condition of the first connection portion 20 and the second connection portion 30 in a certain period of time can be estimated, for example, the first connection portion 20 of the current divider is directly connected to the battery pack, the second connection portion 30 of the current divider is connected to an electric load, the temperature of the battery pack connected to the first connection portion 20 is usually kept at 55 ℃ during normal operation, the temperature of the electric load connected to the second connection portion 30 is usually kept at 40 ℃, the preset temperature difference is 10 ℃, and the current temperatures of the first connection portion 20 and the second connection portion 30 are both 30 ℃. When the temperature of the first connecting portion 20 rises by 10 ℃ within 10 minutes and the temperature of the second connecting portion rises by 8 ℃, the temperature difference after 40 minutes is estimated to reach the preset temperature difference, but the temperature difference after 10 minutes is estimated to reach the preset temperature difference when the battery pack and the electric load work are combined, so that the temperature of the first connecting portion 20 and the temperature of the second connecting portion 30 can be adjusted before the preset temperature difference is reached, for example, the temperature of the first connecting portion 20 and the temperature of the second connecting portion 30 can be adjusted after 5 minutes, or the temperature difference of the first connecting portion 20 and the temperature of the second connecting portion 30 can be adjusted when the estimation is completed, and the situation that the temperature difference of the first connecting portion 20 and the second connecting portion 30 reaches the preset temperature difference, namely, the situation that the detection precision of the diverter is influenced by the thermoelectric potential of the diverter is avoided.
The invention also proposes a shunt comprising:
a shunt body 10;
a first connection part 20 and a second connection part 30 electrically connected to both ends of the shunt body 10;
a temperature control assembly 40, wherein the temperature control assembly 40 is disposed on the first connection portion 20 and the second connection portion 30, and the temperature control assembly 40 is used for adjusting the temperatures of the first connection portion 20 and the second connection portion 30;
and a controller 50, wherein a control end of the controller 50 is connected with a controlled end of the temperature control assembly 40, and a thermoelectric force control program is stored in the controller 50, and when the thermoelectric force control program is executed by the controller 50, the method for eliminating the shunt thermoelectric force control is realized.
The shunt further comprises:
a first temperature sensor 61, where the first temperature sensor 61 is disposed on the first connection portion 20, an output end of the first temperature sensor 61 is connected to a receiving end of the controller 50, and the first temperature sensor 61 is configured to detect a temperature of the first connection portion 20 and output a corresponding temperature detection signal;
the second temperature sensor 62 is disposed on the second connection portion 30, an output end of the second temperature sensor 62 is connected to a receiving end of the controller 50, and the second temperature sensor 62 is configured to detect a temperature of the second connection portion 30 and output a corresponding temperature detection signal.
In this embodiment, the shunt includes two copper bars and a resistor alloy disposed at intervals, namely, a first connecting portion 20, a second connecting portion 30 and a shunt body 10, wherein two ends of the shunt body 10 are welded with the first connecting portion 20 and the second connecting portion 30 respectively. The materials of the first connection portion 20 and the second connection portion 30 may be materials such as copper or brass, and the surfaces of the first connection portion 20 and the second connection portion 30 may be coated with a protective layer, so as to achieve an oxidation-preventing effect on the surfaces of the first connection portion 20 and the second connection portion 30, and avoid the problem of poor contact caused by oxidation of the surfaces of the first connection portion 20 and the second connection portion 30, which is not limited herein. The material of the shunt body 10 may be manganese-copper alloy, iron-chromium-aluminum alloy, nickel-chromium alloy, or the like, wherein when the shunt body 10 is manganese-copper alloy, it has low resistivity and low temperature coefficient characteristics. The first connecting portion 20 and the second connecting portion 30 of the current divider are provided with a temperature control assembly 40 and a temperature sensor, the temperature control assembly 40 can be a semiconductor refrigeration device or a liquid cooling assembly and other temperature control assemblies 40, wherein the semiconductor device is provided with a refrigeration end and a heating end, and the refrigeration end and the heating end can be changed according to different current directions loaded at two ends of the semiconductor device, so that refrigeration or heating of the first connecting portion 20 and the second connecting portion 30 is realized. In addition, when the temperature control assembly 40 selects the liquid cooling assembly, the pipeline can be arranged on the first connecting part 20 and the second connecting part 30, and the pipeline can also pass through the three parts of the diverter main body 10, the first connecting part 20 and the second connecting part 30 at the same time, so that the temperatures of the three parts tend to be consistent at one time, the temperatures of the three parts of the diverter can be simultaneously and rapidly adjusted, and the diverter can be kept at a proper working temperature, so that the high detection precision is kept for detection. The controller 50 may be implemented by a processor, for example, an MCU, a DSP (Digital Signal Process, a digital signal processing chip), an FPGA (Field Programmable Gate Array, a programmable gate array chip), or the like, for controlling the temperature control assembly 40 to adjust the temperatures of the first connection portion 20 and the second connection portion 30, and for obtaining the temperature values of the first connection portion 20 and the second connection portion 30.
In one embodiment, the first connecting portion 20 has a first mounting end, and the second connecting portion 30 has a second mounting end;
the temperature control assembly 40 is disposed on the first mounting end and the second mounting end;
the first temperature sensor 61 and the second temperature sensor 62 are provided on the first mounting end and the second mounting end, respectively.
It will be appreciated that, since the connection portions on both sides of the shunt are respectively connected to different devices or apparatuses, the temperature change will be relatively obvious at the connection portions between the first connection portion 20 and the second connection portion 30 and the connected devices or apparatuses, i.e. the first mounting end and the second mounting end, i.e. the temperature difference between the first mounting end and the second mounting end is the largest, and therefore, the temperature control assembly 40 and the temperature sensor may be disposed at the first mounting end and the second mounting end. So set up, can detect the temperature value of first installation end and second installation end to adjust the temperature value of first installation end and second installation end according to the difference in temperature of first installation end and second installation end, so that the temperature difference of first installation end and second installation end is less than preset temperature difference, thereby improves the detection precision of shunt at the during operation.
The connection between the first connecting portion 20 and the second connecting portion 30 of the shunt and the connecting device or apparatus, that is, the first mounting end and the second mounting end, will generally be provided with mounting holes, so that the device or apparatus connected to the shunt can be detachably connected to the shunt through screws and the mounting holes, and a specific mounting manner of the temperature control assembly 40 will be illustrated below.
In an embodiment, the temperature control assembly 40 may be mounted with mounting screws, for example, corresponding mounting holes are formed in the temperature control assembly 40, and the length of the original screws is increased, so that the devices or apparatuses connected with the current divider can be detachably connected with the current divider through the screws and the mounting holes, and meanwhile, the screws and the mounting holes in the temperature control assembly 40 can be matched, so that the temperature control assembly 40 is mounted on the current divider. In this way, the additional arrangement of the mounting holes on the first connecting portion 20 and the second connecting portion 30 for mounting the temperature control assembly 40 can be avoided, and the damage to the structure of the splitter when the temperature control assembly 40 is mounted is avoided, thereby avoiding influencing the detection accuracy of the splitter.
In another embodiment, the screw may be made of a heat conducting material, the temperature control component 40 may be disposed on the screw, or the temperature control component 40 may be directly integrated in the screw and integrally disposed with the screw, or the temperature control component 40 may be made into a screw shape, so, when a device or apparatus connected to the shunt is detachably connected to the shunt through the screw and the mounting hole, the temperature control component 40 may perform temperature control on the screw, thereby implementing temperature adjustment on the first connection portion 20 and the second connection portion 30 by using heat transfer. In addition, the temperature control assembly 40 can be further arranged on a circuit board provided with the controller 50, and the additional arrangement of mounting holes on the first connecting part 20 and the second connecting part 30 for mounting the temperature control assembly 40 can be avoided, so that the damage to the structure of the flow divider during the mounting of the temperature control assembly 40 is avoided, and the influence on the detection precision of the flow divider is avoided.
It can be appreciated that the first temperature sensor 61 and the second temperature sensor 62 may be integrally provided with the temperature control assembly 40, or may be implemented by using the temperature control assembly 40 with a temperature detection function, so that the temperature control assembly 40 can directly perform temperature adjustment on the first connecting portion 20 and the second connecting portion 30 according to the detected temperature, thereby not only improving the response speed of temperature adjustment, but also further reducing the installed devices, and avoiding damage to the structure of the current divider when the first temperature sensor 61 and the second temperature sensor 62 are installed, thereby avoiding influencing the detection accuracy of the current divider.
It should be noted that, in practical application of the current divider, the devices or apparatuses connected to the first connection portion 20 and the second connection portion 30 of the current divider are fixed, which means that the temperature change of the first connection portion 20 and the second connection portion 30 of the current divider is related to the connected devices or apparatuses, in other words, the devices or apparatuses connected to the first connection portion 20 and the second connection portion 30 of the current divider are fixed, so that the connection portions with larger temperature values are fixed when the first connection portion 20 and the second connection portion 30 of the current divider are operated. The temperature control assembly 40 can be specifically installed according to a specific application scenario, for example, the first connection portion 20 of the current divider is directly connected with the battery pack, the second connection portion 30 of the current divider is connected with the electric load through the electric connection line, and at this time, the first connection portion 20 of the current divider is directly connected with the battery pack, and the second connection portion 30 of the current divider is connected with the electric load through the electric connection line, so that after the current divider works normally for a period of time, the temperature of the first connection portion 20 of the current divider is higher than the temperature of the second connection portion 30 of the current divider. At this time, the temperature control assembly 40 may be implemented by using a semiconductor cooling plate, and the cooling end of the semiconductor cooling plate is disposed on the first connecting portion 20, and the heating end of the semiconductor cooling plate is disposed on the second connecting portion 30, so that when the semiconductor cooling plate works, the first connecting portion 20 can be cooled, and the second connecting portion 30 can be heated at the same time, so that the temperature difference between the first connecting portion 20 and the second connecting portion 30 can be quickly reduced to a preset range. By the arrangement, the temperature adjustment of the first connecting part 20 and the second connecting part 30 can be simultaneously realized by only arranging one temperature control assembly 40, the speed of the temperature adjustment can be improved, and the thermoelectric voltage caused by the temperature difference between the first connecting part 20 and the second connecting part 30 can be rapidly eliminated. It can be understood that the current divider can be applied to different scenes, in different application scenes, the devices or apparatuses connected to the first connection portion 20 and the second connection portion 30 of the current divider are different, the above embodiment is only one of multiple application scenes, in practical application, the temperature control assembly 40 can be installed and set according to the practical application scene of the current divider and the specific devices or apparatuses connected to the two connection portions of the current divider, so that the temperature adjustment effect of the temperature control assembly 40 is adapted to the practical application scene, the temperature adjustment efficiency of the temperature control assembly 40 can be effectively improved, and the overall cost of the current divider is reduced.
The invention also provides electric equipment, which comprises the current divider, and the specific structure of the current divider refers to the embodiment, and because the electric equipment adopts all the technical schemes of all the embodiments, the electric equipment at least has all the beneficial effects brought by the technical schemes of the embodiments, and the detailed description is omitted.
The invention also provides energy storage equipment comprising the shunt.
In this embodiment, the energy storage device may be an energy storage device such as an energy storage integrated machine, a battery pack, a mobile charging vehicle, an outdoor power supply, etc., and the specific structure of the current divider refers to the above embodiment.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (11)
1. The method for controlling the thermal potential of the eliminating shunt comprises a shunt body, a first connecting part, a second connecting part and a temperature control assembly, wherein the first connecting part and the second connecting part are connected with two ends of the shunt body, and the temperature control assembly is arranged on the first connecting part and the second connecting part, and the method for controlling the thermal potential of the eliminating shunt is characterized by comprising the following steps:
Acquiring a temperature value of the first connecting part and the second connecting part;
when the temperature difference between the first connecting part and the second connecting part is larger than the preset temperature difference, the temperature control assembly is controlled to adjust the temperature of the first connecting part and/or the temperature of the second connecting part, so that the temperature difference between the first connecting part and the second connecting part is smaller than the preset temperature difference.
2. The method of claim 1, wherein the step of controlling the temperature control assembly to adjust the temperature of the first connection and/or the second connection comprises:
controlling the temperature control assembly to adjust the temperature of one connecting part to be equal to the temperature of the other connecting part; or alternatively, the process may be performed,
and determining an average temperature value according to the temperature values of the first connecting part and the second connecting part, and controlling the temperature control assembly to adjust the temperatures of the first connecting part and the second connecting part to the average temperature value.
3. The method of claim 1, wherein the step of controlling the temperature control assembly to adjust the temperature of the first connection and/or the second connection further comprises, prior to:
Acquiring a preset temperature value of the shunt;
the step of controlling the temperature control assembly to adjust the temperature of the first connection portion and/or the second connection portion specifically includes:
and controlling the temperature control assembly to adjust the temperature of the first connecting part and/or the second connecting part according to the temperature values of the first connecting part and the second connecting part and the preset temperature value.
4. The method for controlling a thermal potential of a current divider according to claim 3, wherein the step of controlling the temperature control unit to adjust the temperature of the first connection portion and/or the second connection portion according to the temperature values of the first connection portion and the second connection portion and a preset temperature value comprises:
and comparing the temperature value of the first connecting part and the temperature value of the second connecting part with preset temperature values respectively, obtaining comparison results, and controlling the temperature control assembly to adjust the temperature of the first connecting part and/or the temperature of the second connecting part according to the comparison results.
5. The method for controlling a thermal potential of a current divider according to claim 4, wherein the step of controlling the temperature control assembly to adjust the temperature of the first connection portion and/or the second connection portion according to the comparison result comprises:
When the temperature values of the first connecting part and the second connecting part are larger than the preset temperature value, controlling the temperature control assembly to adjust the temperatures of the first connecting part and the second connecting part to the preset temperature value;
when the temperature value of one connecting part of the shunt is larger than a preset temperature value and the temperature value of the other connecting part is smaller than the preset temperature value, controlling the temperature control assembly to adjust the temperature of the connecting part with the temperature value larger than the preset temperature value to be equal to the temperature of the other connecting part;
when the temperature values of the first connecting part and the second connecting part are smaller than the preset temperature value, the temperature control assembly is controlled to adjust the temperature of one connecting part to be equal to the temperature of the other connecting part, or an average temperature value is determined according to the temperature values of the first connecting part and the second connecting part, and the temperature control assembly is controlled to adjust the temperature of the first connecting part and the temperature of the second connecting part to the average temperature value.
6. The method of eliminating shunt thermal potential control of claim 1, wherein the first connection portion has a first mounting end for connection to an electrical load, and the second connection portion has a second mounting end for connection to a power source;
The step of obtaining the temperature value of the first connecting part and the second connecting part specifically comprises the following steps:
acquiring a temperature value of the first installation end and the second installation end;
the step of adjusting the temperature of the first connecting part and/or the second connecting part according to the temperature values of the first connecting part and the second connecting part so that the temperature difference between the first connecting part and the second connecting part is smaller than a preset temperature difference value specifically comprises the following steps:
according to the temperature values of the first mounting end and the second mounting end, the temperature of the first mounting end and/or the second mounting end is/are adjusted so that the temperature difference between the first mounting end and the second mounting end is smaller than a preset temperature difference.
7. A shunt, the shunt comprising:
a diverter body;
a first connecting part and a second connecting part which are electrically connected with two ends of the diverter main body;
the temperature control assembly is arranged on the first connecting part and the second connecting part and is used for adjusting the temperature of the first connecting part and the second connecting part;
the control end of the controller is connected with the controlled end of the temperature control assembly, a thermoelectric force control program is stored in the controller, and the thermoelectric force control program realizes the method for eliminating the shunt thermoelectric force control according to any one of claims 1-6 when the thermoelectric force control program is executed by the controller.
8. The shunt of claim 7, wherein said shunt further comprises:
the first temperature sensor is arranged on the first connecting part, the output end of the first temperature sensor is connected with the receiving end of the controller, and the first temperature sensor is used for detecting the temperature of the first connecting part and outputting a corresponding temperature detection signal;
the second temperature sensor is arranged on the second connecting part, the output end of the second temperature sensor is connected with the receiving end of the controller, and the second temperature sensor is used for detecting the temperature of the second connecting part and outputting a corresponding temperature detection signal.
9. The shunt of claim 8, wherein said first connection has a first mounting end and said second connection has a second mounting end;
the temperature control assembly is arranged on the first mounting end and the second mounting end;
the first temperature sensor and the second temperature sensor are respectively arranged on the first mounting end and the second mounting end.
10. A powered device comprising a shunt as claimed in any one of claims 7 to 9.
11. An energy storage device comprising a shunt according to any one of claims 7-9.
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| CN202310358206.0A CN116466130B (en) | 2023-03-26 | 2023-03-26 | Control method for eliminating thermoelectric potential of shunt, electric equipment and energy storage equipment |
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| CN202310358206.0A CN116466130B (en) | 2023-03-26 | 2023-03-26 | Control method for eliminating thermoelectric potential of shunt, electric equipment and energy storage equipment |
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| CN116466130B (en) | 2024-04-30 |
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