CN212111562U - DC current detection device - Google Patents

Abstract

The invention relates to a direct current detection device, which comprises a PCB (printed circuit board), a connector, a current acquisition unit, a shunt and a sampling wire harness, wherein the connector, the PCB and the shunt are sequentially stacked, and the connector is connected with the current acquisition unit through the sampling wire harness; the shunt is installed on the equipment to be tested through a fastener, and a temperature sensor is arranged on the fastener. The device disclosed can monitor the temperature of shunt in real time, judge whether the fastener is not hard up, avoid each components and parts to work under high temperature environment for a long time, prolonged the working life of components and parts.

Description

DC current detection device

Technical Field

The disclosure relates to the field of electric automobile current detection, in particular to a direct current detection device.

Background

The field of application of shunts generally takes two forms: although the two designs have certain advantages, the two designs have obvious disadvantages, such as the fact that current signal transmission is easily interfered in a complex electromagnetic environment, and the defect that devices are damaged due to the fact that the temperature of a shunt is rapidly increased, the service life of a battery is influenced, and safety accidents are seriously caused.

SUMMERY OF THE UTILITY MODEL

An object of the present disclosure is to provide a direct current detection apparatus capable of monitoring a temperature change of a shunt in real time.

In order to achieve the above object, the present disclosure provides a dc current detection device, including a PCB, a connector, a current collection unit, a shunt, and a sampling harness, wherein the connector, the PCB, and the shunt are sequentially stacked, and the connector is connected to the current collection unit through the sampling harness; the shunt is installed on the equipment to be tested through a fastener, and a temperature sensor is arranged on the fastener.

Optionally, the sampling beam comprises an inner core layer and an isolation layer wrapping the inner core layer.

Optionally, the inner core layer comprises a current sampling beam and a temperature sampling beam.

Optionally, the current sampling harness is a twisted pair harness, and the temperature sampling harness is a twisted pair harness.

Optionally, the lengths of the lines of the current sampling harness and the temperature sampling harness are respectively 18 cm-22 cm.

Optionally, the temperature sensor is connected to the PCB board.

Optionally, the number of the temperature sensors is one or more.

Optionally, the device under test is a battery pack.

Optionally, the fastener is a bolt.

The following benefits are achieved by adding a temperature sensor to the fastener of the shunt and optionally using a twinning, shielding process for the wiring harness:

(1) the connection looseness condition of the shunt is detected, and the connection reliability is improved;

(2) the components are prevented from working in a high-temperature environment for a long time, and the service life of the components is prolonged;

(3) current transmission signals are enhanced, and signal anti-interference performance is enhanced;

(4) the detection precision is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

fig. 1 is a schematic structural diagram of a dc current detecting device.

Description of the reference numerals

1. A current sampling wire harness; 2. a temperature sampling wire harness; 3. an isolation layer; 4. a PCB board; 5. a temperature sensor; 6. a fastener; 7. a flow divider; 8. a connector; A. an inner core layer.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, the use of directional terms such as "up, down, left, and right" generally means up, down, left, and right of the dc current detection device in the drawings of the specification, unless otherwise specified.

Referring to fig. 1, the present disclosure provides a dc current detection device, including a PCB 4, a connector 8, a current collection unit, a shunt 7, and a sampling harness, where the connector 8, the PCB 4, and the shunt 7 are sequentially stacked, and the connector 8 is connected to the current collection unit through the sampling harness; the shunt 7 is installed on the equipment to be tested through a fastener 6, and the temperature sensor 5 is arranged on the fastener 6.

A tin metal layer can be plated on the shunt 7, the metal part of the shunt 7 is prevented from being oxidized, the connection between the shunt 7 and the PCB 4 is facilitated, and the shunt 7 and the PCB 4 can be welded by adopting reflow soldering. Connector 8 can adopt 8pin specifications, and wherein 4pin is used for transmitting temperature sensor 5's analog signal, and 4pin divide into two sets of 2 pins, carries out redundant transmission to the voltage signal that current produced through shunt 7, improves the reliability of connecting, avoids because vibration terminal contact failure, mechanical shock lead to signal transmission to break off.

Further, the sampling wire harness includes an inner core layer a and an isolation layer 3 wrapping the inner core layer a. The isolation layer 3 can effectively avoid the influence of the external electromagnetic environment on the current signal.

Further, the inner core layer a includes a current sampling beam 1 and a temperature sampling beam 2.

Further, the current sampling harness 1 is a twisted pair harness, and the temperature sampling harness 2 is a twisted pair harness.

Further, the lengths of the lines of the current sampling harness 1 and the temperature sampling harness 2 may be 18cm to 22cm, for example, 20cm, respectively.

The current sampling wire harness 1 and the temperature sampling wire harness 2 are subjected to twisted pair shielding treatment and length limitation, the problems that signals are prone to interference and large in acquisition error due to long-distance transmission can be solved, and current signal transmission is enhanced.

Further, temperature sensor 5 is connected with PCB board 4, and PCB board 4 receives the temperature signal that temperature sensor 5 gathered, and the elasticity condition of fastener 6 is judged to the temperature variation of real-time supervision fastener 6, avoids components and parts to be in high temperature state during operation in a long-term, increases the life of components and parts.

Further, the number of the temperature sensors 5 may be one or more, and is increased or decreased according to the detection requirement, and the number of the temperature sensors 5 in fig. 1 is 2.

Further, in this embodiment, the device under test may be a battery pack. Further, the fastener 6 is a bolt. The torque of the fastening member 6 is determined by testing that the temperature of the fastening member 6 is lower than the maximum temperature of the shunt 7, the PCB 4 and the connector 8 under different temperature conditions. When the shunt 7 is connected in series in the main current loop, the fastener 6 at the connection position of the shunt 7 loosens due to continuous large current, so that a large amount of heat is generated, the temperature is increased sharply, and other components such as the shunt 7 are damaged. In the device of this disclosure, the temperature and the temperature rise rate of current acquisition unit through gathering fastener 6 in real time, judge whether fastener 6 exists not hard up, reduce because connect some safe risks that not hard up leads to, extension battery package life-span, the emergence hidden danger of greatly reduced incident.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that the various technical features described in the above embodiments may be combined in any suitable manner without contradiction, for example, the sampling harness may be any other sampling harness, and the length of the harness is set according to the positions of the connector and the collecting unit. In order to avoid unnecessary repetition, various possible combinations will not be separately described in this disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (9)

1. A direct current detection device is characterized by comprising a PCB, a connector, a current acquisition unit, a shunt and a sampling wire harness, wherein the connector, the PCB and the shunt are sequentially stacked, and the connector is connected with the current acquisition unit through the sampling wire harness; the shunt is installed on the equipment to be tested through a fastener, and a temperature sensor is arranged on the fastener.

2. The direct current detection device of claim 1, wherein the sampling harness comprises an inner core layer and an insulation layer wrapping the inner core layer.

3. The direct current detection device according to claim 2, wherein the inner core layer includes a current sampling harness and a temperature sampling harness.

4. The direct current detection device according to claim 3, wherein the current sampling harness is a twisted pair harness, and the temperature sampling harness is a twisted pair harness.

5. The direct current detection device according to claim 3, wherein the lengths of the lines of the current sampling harness and the temperature sampling harness are respectively 18cm to 22 cm.

6. The direct current detection device according to claim 1, wherein the temperature sensor is connected to the PCB.

7. The direct current detection device according to claim 1, wherein the number of the temperature sensors is one or more.

8. The direct current detection device according to any one of claims 1 to 7, wherein the device under test is a battery pack.

9. The direct current detection device according to any one of claims 1 to 7, wherein the fastening member is a bolt.

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