Temperature detection device of shunt

Abstract

The utility model discloses a temperature detection device of a diverter, which is applied to a power battery and a power supply module electrically connected with the power battery, two ends of the diverter are respectively electrically connected with the positive electrodes of the power battery and the power supply module, and copper sheets are respectively welded at the joints of the two ends of the diverter and the power battery and the power supply module; the device comprises an NTC resistor which is arranged on a copper sheet at one end of the two ends of the shunt, is separated from the end part of the shunt by a preset distance, and is used for detecting the temperature of the shunt; and the PCB is provided with a temperature detection circuit, and the temperature detection circuit is electrically connected with the NTC resistor, receives a temperature signal from the NTC resistor and transmits the temperature signal to the outside through the PCB. According to the utility model, the temperature detector can detect the temperature of the shunt for a long time while the detection precision of the temperature detector is not influenced, and the maintenance interval time is long.

Description

Technical Field

[0001] The utility model relates to the field of shunts, in particular to a temperature detection device for shunts. Background Art

[0002] In the formation and capacity division process of traditional power batteries, the accuracy requirements for current are very strict. In the current market today, power modules used to divide batteries into capacities often use shunts to monitor the output current. Shunts are essentially high-precision, low-resistance resistors. When current flows through the shunt, a voltage is formed at the positive and negative electrodes of the shunt. According to Ohm's law: U = I*R

[0003] It can be seen that after the current flows through the shunt impedance R, the current I flowing through the shunt can be converted by directly detecting the voltage drop U across the shunt.

[0004] During the use of the shunt, heat will be generated, which will cause the detection accuracy of the shunt to change. Therefore, it is very important to monitor the temperature of the shunt in real time. By detecting the shunt temperature in real time and performing temperature compensation, inaccurate current values ​​measured by the detection data can be prevented.

[0005] The existing temperature detection device of the shunt adopts a direct gluing method to fix the temperature detector on the shunt. Although this can directly detect the temperature of the shunt, the glue often fails, making it impossible for the temperature detection device to stick to the shunt for a long time, affecting the measurement accuracy. Therefore, the staff needs to frequently replace the glue on the temperature detector, which shortens the maintenance interval of the temperature detector and greatly increases the workload of the staff. Utility Model Content

[0006] The purpose of the utility model is to solve the problem that the existing temperature detection device uses a direct pasting method to fix the temperature detector on the shunt when detecting the temperature of the shunt, which has a short maintenance interval and increases the workload of the staff. The utility model provides a temperature detection device for the shunt, which enables the temperature detector to detect the temperature of the shunt for a long time without affecting the detection accuracy of the temperature detection detector, and the maintenance interval is long.

[0007] In order to solve the above technical problems, the embodiment of the utility model discloses a device applied to a power battery and a power module electrically connected to the power battery, wherein the two ends of the shunt are electrically connected to the positive electrodes of the power battery and the power module respectively, and copper sheets are welded to the connection points between the two ends of the shunt and the power battery and the power module respectively; the device comprises:

[0008] An NTC resistor is disposed on the copper sheet at one end of the shunt, the NTC resistor is spaced a preset distance from the end of the shunt, and is used to detect the temperature of the shunt;

[0009] The PCB circuit board is provided with a temperature detection circuit, which is electrically connected to the NTC resistor, receives a temperature signal from the NTC resistor and transmits the temperature signal to the outside through the PCB circuit board.

[0010] By adopting the above technical solution, it is possible to achieve that the temperature detector can detect the temperature of the shunt for a long time without affecting the detection accuracy of the temperature detection detector, and the maintenance interval is long.

[0011] According to another specific embodiment of the utility model, the embodiment of the utility model discloses that the NTC resistor also includes a pin, and the pin is electrically connected to the temperature detection circuit after extending out of the copper sheet.

[0012] By adopting the above technical solution, the NTC resistor can be directly connected to the temperature detection circuit, which can reduce additional leads and reduce the welding workload.

[0013] According to another specific embodiment of the present utility model, the embodiment of the present utility model discloses that a slot is provided on a PCB circuit board, and the pin is electrically connected to the temperature detection circuit after passing through the slot.

[0014] According to another specific embodiment of the present utility model, the embodiment of the present utility model discloses a spacing range between an NTC resistor and an end of a shunt in a range of 0-0.5 cm.

[0015] By adopting the above technical solution, the chip NTC resistor can be installed in this area. The NTC resistor can accurately capture the shunt temperature with an error within 1 degree, instead of sticking it on the shunt.

[0016] According to another specific embodiment of the present utility model, the embodiment of the present utility model discloses an NTC resistor and a spacing distance between the ends of the shunt is 0.5 cm.

[0017] According to another specific embodiment of the utility model, the embodiment of the utility model discloses an NTC resistor arranged on the copper sheet at the connection between the shunt and the positive electrode of the power battery.

[0018] According to another specific embodiment of the present utility model, an embodiment of the present utility model discloses an NTC resistor which is a chip NTC resistor.

[0019] According to another specific embodiment of the present utility model, the embodiment of the present utility model discloses a device which also includes a data processor, wherein the data processor is electrically connected to a PCB circuit board and is used to receive a temperature signal from a temperature detection circuit.

[0020] According to another specific embodiment of the present utility model, the embodiment of the present utility model discloses a shunt which is arched and arranged at both ends of the connection between the power battery and the power module.

[0021] By adopting the above technical solution, the arch-bridge-shaped appearance has better heat dissipation performance, and the arch-bridge-shaped diverter shape can further reduce the influence of temperature on the accuracy of its detection data.

[0022] The beneficial effect of the present application is that by providing a temperature detection device for a shunt, the temperature detector can detect the temperature of the shunt for a long time without affecting the detection accuracy of the temperature detection detector, and the maintenance interval is long. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram showing the structure of the temperature detection device of the shunt in the embodiment of the utility model Figure 1 ;

[0024] Figure 2 A schematic diagram showing the structure of the temperature detection device of the shunt in the embodiment of the utility model Figure 2 ;

[0025] The reference numerals are as follows:

[0026] 1. Shunt; 2. Copper sheet; 3. NTC resistor; 31. Pins; 4. PCB circuit board; 41. Temperature detection circuit. DETAILED DESCRIPTION

[0027] The following is an explanation of the implementation of the present invention by specific specific embodiments. Those skilled in the art can easily understand other advantages and functions of the present invention from the contents disclosed in this specification. Although the description of the present invention will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this utility model are limited to this implementation. On the contrary, the purpose of introducing the utility model in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, the following description will include many specific details. The present invention can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present invention, some specific details will be omitted in the description. It should be noted that, in the absence of conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0028] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0029] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0031] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0032] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] The applicant found that the reason why the temperature detector cannot be pasted on the diverter for a long time is that the diverter generates heat during use and the temperature change range of the diverter is relatively large, causing the glue adhered to the diverter to gradually lose its viscosity due to temperature changes, making it impossible for the temperature detector to be pasted on the diverter for a long time.

[0034] Reference Figure 1 and Figure 2 The present application provides a temperature detection device for a shunt, which is applied to a power battery and a power module electrically connected to the power battery. The two ends of the shunt 1 are electrically connected to the positive electrodes of the power battery and the power module respectively, and copper sheets 2 are welded to the connection points between the two ends of the shunt 1 and the power battery and the power module respectively; the device includes: an NTC resistor 3, which is arranged on the copper sheet 2 at one end of the two ends of the shunt 1, and the NTC resistor 3 is spaced a preset distance from the end of the shunt 1, and is used to detect the temperature of the shunt 1; a PCB circuit board 4, on which a temperature detection circuit 41 is provided, and the temperature detection circuit 41 is electrically connected to the NTC resistor 3, receives a temperature signal from the NTC resistor 3 and transmits the temperature signal to the outside through the PCB circuit board 4.

[0035] In this embodiment, the NTC resistor 3 is also called a negative temperature coefficient thermistor, which has the characteristic of fast response to various temperature changes. Using the NTC resistor 3 to monitor the temperature of the shunt 1 can ensure high real-time and accuracy of the temperature monitoring of the shunt 1. Using the NTC resistor 3 to monitor the temperature of the shunt 1 in real time can facilitate temperature compensation of the shunt 1, making the data detection more accurate and reliable.

[0036] Copper sheets 2 are welded at the connection points between the two ends of the shunt 1 and the power battery and the power module, respectively. The copper sheet 2 at one end can dissipate the temperature of the shunt 1 to prevent the temperature of the shunt 1 from being too high. The NTC resistor 3 can be set on the copper sheet 2 at the connection point between the shunt 1 and the positive electrode of the power battery, or on the copper sheet 2 at the connection point between the shunt 1 and the positive electrode of the power module. The applicant found that when the temperature detection area of ​​the NTC resistor 3 is set on the copper sheet 2 at one end of the shunt 1, when the NTC resistor 3 is separated from the end of the shunt 1 by a preset distance, the temperature on the copper sheet 2 detected by the NTC resistor 3 is within one degree of the actual temperature on the shunt 1, and the temperature difference within one degree can have a negligible effect on the accuracy of the shunt 1.

[0037] Among them, the NTC resistor 3 is also electrically connected to the temperature detection circuit 41 on the PCB circuit board 4. The temperature detection circuit 41 can directly obtain the temperature signal detected by the NTC resistor 3 and transmit the temperature signal to the designated device through the PCB circuit board 4.

[0038] In this embodiment, by directly welding the temperature detection area of ​​the NTC resistor 3 to the copper sheet 2 at one end of the shunt 1, the temperature detection area of ​​the NTC resistor 3 can be permanently fixed on the copper sheet 2, so as to facilitate long-term detection of temperature changes on the copper sheet 2, thereby achieving accurate measurement of temperature detection data and long maintenance intervals. Furthermore, the NTC resistor 3 does not contact the shunt 1, and can not affect the heat dissipation of the shunt 1, which is convenient for use.

[0039] While not affecting the detection accuracy of the temperature detection detector, the temperature detector is enabled to detect the temperature of the diverter 1 for a long time, and the maintenance interval is long.

[0040] The applicant found that the temperature detector is fixed on the shunt 1 by direct pasting. Because the pasting position is on the shunt 1, the temperature detector needs additional leads to connect with the PCB circuit board 4. Since the temperature detector is often loosened due to the failure of the adhesive on the shunt 1, the additional leads of the temperature detector are prone to aging and loosening, which affects the product life. The lead is too long and will also affect the accuracy of the temperature measurement data. And because the external lead is required, additional welding is required, the process is cumbersome and the workload is increased.

[0041] In an implementable embodiment, the NTC resistor 3 is a chip NTC resistor 3, and the NTC resistor 3 also includes a pin 31. The pin 31 extends out of the copper sheet 2 and is electrically connected to the temperature detection circuit 41. A slot is provided on the PCB circuit board 4, and the pin 31 passes through the slot and is electrically connected to the temperature detection circuit 41.

[0042] In this embodiment, the chip NTC resistor 3 can be directly fixed on the copper sheet 2, and is electrically connected to the temperature detection circuit 41 after the pin 31 passes through the slot, without the need for additional leads, and can be directly connected to the temperature detection circuit on the PCB circuit board 4, and can be conveniently mounted on the circuit board. The chip NTC resistor 3 is used to detect the temperature of the shunt 1, and the routing can be designed on the PCB circuit board 4 without the need for additional leads, which improves reliability, and the temperature detection circuit 41 can be arranged in an adjacent position on the same PCB board, reducing the current signal interference of other components and facilitating the transmission of signals to the outside.

[0043] In an implementable embodiment, the embodiment of the utility model discloses a spacing range between the NTC resistor 3 and the end of the shunt 1 of 0-0.5 cm.

[0044] In this embodiment, in order to facilitate heat dissipation, there is usually a large copper sheet 2 at the welding point between the shunt 1 and the PCB circuit board 4. On the copper sheet 2 at a distance from the shunt 1, the temperature of the copper sheet 2 is less than one degree Celsius from the temperature of the shunt 1. The temperature difference within one degree Celsius has a negligible effect on the current detection accuracy of the shunt 1. This area can replace the shunt 1 as a monitoring area for temperature detection. By assembling the chip NTC resistor 3 in this area, it can be replaced by pasting on the shunt 1. It is known from experiments that when the distance between the NTC resistor 3 and the shunt 1 on the PCB circuit board 4 is within 0.5 cm, the NTC resistor 3 can accurately capture the temperature of the shunt 1 with an error within 1 degree.

[0045] In an implementable embodiment, the distance between the NTC resistor 3 and the shunt 1 on the PCB circuit board 4 is X, where X is the distance from the farthest area on the copper sheet 2 where the temperature difference with the shunt 1 does not exceed one degree Celsius to the shunt 1, and the area on the copper sheet 2 where the temperature difference with the shunt 1 does not exceed one degree Celsius can be used as a replacement for the temperature measurement area pasted on the shunt 1, that is, the distance between the NTC resistor 3 and the shunt includes but is not limited to the range of 0-0.5cm.

[0046] In an implementable embodiment, the NTC resistor 2 can also be a plug-in packaged NTC resistor. The plug-in packaged NTC resistor is fixed close to the copper sheet 2 in an area within 0.5 cm from the end of the shunt 1, and the plug-in packaged NTC resistor is pasted or tied to the copper sheet. The plug-in packaged NTC resistor is in an elliptical spherical shape and is suitable for devices with higher power.

[0047] In an implementable embodiment, the spacing between the NTC resistor 3 and the end of the shunt 1 is 0.5 cm. The shunt 1 is generally made of a specific metal alloy, such as manganese copper alloy and nickel chromium alloy. The shunt 1 made of these alloys has a small temperature drift coefficient, and the resistance value will not change with the increase of temperature during operation. Pasting the temperature detector on the shunt 1 will affect the heat dissipation of the shunt 1. The spacing between the NTC resistor 3 and the end of the shunt 1 is 0.5 cm. While not affecting the current detection accuracy, the NTC resistor 3 can also be better fixed on the copper sheet 2.

[0048] In an implementable embodiment, the NTC resistor 3 is arranged on the copper sheet 2 at the connection between the shunt 1 and the positive electrode of the power battery. In this embodiment, the NTC resistor 3 is arranged on the copper sheet 2 at the connection between the shunt 1 and one end of the positive electrode of the power battery. In order to detect the temperature change of the shunt 1 more accurately, the NTC resistor 3 is arranged on the copper sheet 2 at the connection between the shunt 1 and the positive electrode of the power battery.

[0049] In an implementable embodiment, a data processor is further included, and the data processor is electrically connected to the PCB circuit board 4 and is used to receive the temperature signal from the temperature detection circuit 41.

[0050] In this embodiment, the data processor is usually a digital signal processor (DSP). DSP (digital singnal processor) is a unique microprocessor, which is a device that processes a large amount of information with digital signals. Its working principle is to receive analog signals, convert them into digital signals of 0 or 1, and then modify, delete, and strengthen the digital signals, and interpret the digital data back to analog data or actual environment format in other system chips. It is not only programmable, but also has a real-time running speed of tens of millions of complex instruction programs per second, which is far more than general microprocessors. It is an increasingly important computer chip in the digital electronic world. Its powerful data processing ability and high running speed are the two most commendable features. DSP is the abbreviation of Digital Signal Processing (theory and method of digital signal processing) or Digital Signal Processor (programmable microprocessor for digital signal processing). The DSP technology we are talking about generally refers to the method and technology of using general or special DSP processors to complete digital signal processing. By adopting the chip NTC resistor 3, the temperature detection circuit 41 and the signal transmission device on the PCB circuit board 4 can be arranged on the same PCB board, and the temperature detection circuit 41 and the signal transmission device can also be set in adjacent positions, reducing current interference and directly transmitting the signal to the data processor.

[0051] In an implementable embodiment, the shunt 1 is arched and arranged at the positive pole of the power battery and the power module. In this embodiment, the arched bridge shape has good heat dissipation. The shunt 1 is usually made of a specific metal alloy, such as manganese copper alloy and nickel chromium alloy. The shunt 1 made of these alloys has a small temperature drift coefficient, and the resistance value will not change with the increase of temperature during operation. The use of the arched bridge shunt 1 shape can further reduce the impact of temperature on its accuracy.

[0052] By providing a temperature detection device for a shunt, a chip NTC resistor 3 is directly attached to the copper sheet 2 at the end of the shunt 1 and the connection with the power battery and the power module, and the temperature change of the shunt 1 can be accurately detected without affecting the detection accuracy of the shunt 1. The NTC resistor has a fast response speed, low cost, and is insensitive to electrical noise. The chip NTC resistor 3 can be directly fixed on the copper sheet 2, and is electrically connected to the temperature detection circuit 41 on the PCB circuit board 4 after the pin 31 passes through the slot. No additional leads are required, and it can be directly connected to the temperature detection circuit 41 on the PCB circuit board 4, thereby improving the service life of the circuit and reducing the process difficulty. In the circuit structure provided by the present application, by selecting the layout position of the temperature detection circuit 41, it is closer to the signal input end of the data processor, further improving the reliability, and reducing the current signal interference of other components.

[0053] Although the present invention has been illustrated and described with reference to certain preferred embodiments of the present invention, it should be understood by those skilled in the art that the above contents are further detailed descriptions of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art may make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A shunt temperature detection device, applied to a power battery and a power module electrically connected to the power battery, wherein the two ends of the shunt (1) are electrically connected to the positive electrodes of the power battery and the power module respectively, and copper sheets (2) are welded at the connection points between the two ends of the shunt (1) and the power battery and the power module respectively; characterized in that: The device comprises: An NTC resistor (3) is arranged on the copper sheet (2) at one of the two ends of the shunt (1), the NTC resistor (3) being spaced a preset distance from the end of the shunt (1) and being used to detect the temperature of the shunt (1); A PCB circuit board (4) is provided with a temperature detection circuit, the temperature detection circuit is electrically connected to the NTC resistor (3), receives a temperature signal from the NTC resistor (3) and transmits the temperature signal to the outside through the PCB circuit board (4).

2. The temperature detection device of the shunt according to claim 1, characterized in that: The NTC resistor (3) further comprises a pin (31), and the pin (31) is electrically connected to the temperature detection circuit after extending out of the copper sheet (2).

3. The temperature detection device of the shunt as claimed in claim 2, characterized in that: The PCB circuit board (4) is provided with a slot, and the pin (31) is electrically connected to the temperature detection circuit after passing through the slot.

4. The temperature detection device of the shunt according to claim 1, characterized in that: The spacing between the NTC resistor (3) and the end of the shunt (1) ranges from 0 to 0.5 cm.

5. The temperature detection device of the shunt as claimed in claim 4, characterized in that: The distance between the NTC resistor (3) and the end of the shunt (1) is 0.5 cm.

6. The temperature detection device of the shunt according to claim 1, characterized in that: The NTC resistor (3) is arranged on the copper sheet (2) at the connection point between the shunt (1) and the positive electrode of the power battery.

7. The temperature detection device of the diverter (1) according to claim 1, characterized in that: The NTC resistor (3) is a chip NTC resistor (3).

8. The temperature detection device of the shunt according to claim 1, characterized in that: It also includes a data processor, which is electrically connected to the PCB circuit board (4) and is used to receive the temperature signal from the temperature detection circuit.

9. The temperature detection device of the shunt according to claim 1, characterized in that: The shunt (1) is arranged in an arch shape at both ends of the connection between the power battery and the power module.

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